HARVARD UNIVERSITY B® LIBRARY OF THE Museum of Comparative Zoology /f'4-d UNIVERSITY OF KANSAS SCIENCE BULLETIN mi, t NOV 30 m% UNIVERSITY OF KANSAS PUBLICATIONS University of Kansas Science Bulletin -Vol. XXXII November 25, 1948 Lawrence, Kansas / ANNOUNCEMENT The University of Kansas Science Bulletin (continuation of the Kansas University Quarterly) is issued in parts at irregular inter- vals. Each volume contains from 300 to 600 pages of reading mat- ter, with necessary illustrations. Exchanges with other institutions and learned societies everywhere are solicited. All exchanges should be addressed to the Library of the University of Kansas. The University of Kansas Science Bulletin, Library of the University of Kansas, Lawrence, Kan. PUBLICATION DATES The actual date of publication {i. e., mailing date) of many of the volumes of the University of Kansas Science Bulletin differs so markedly from the dates bourne on the covers of the publication or on the covers of the separata that it seems wise to offer a corrected list showing the mailing date. The editor has been unable to verify mailing dates earlier than 1932, Separata were issued at the same time as the whole volume. Vol. XX— October 1, 1932. Vol. XXI— November 27, 1934. Vol. XXII— November 15, 1935. Vol. XXIII— August 15, 1936. Vol. XXIV— February 16, 1938. Vol. XXV— July 10, 1939. Vol. XXVI— November 27, 1940. Vol. XXVII, Pt. I— Dec. 30, 1941. Vol. XXVIII, Pt. I— May 15, 1942; Pt. II— Nov. 12, 1942. Vol. XXIX, Pt. I^July 15, 1943; Pt. II— Oct. 15, 1943. Vol. XXX, Pt. I— June 12, 1944. Vol. XXX, Pt. II— June 15, 1945. Vol. XXXI, Pt. I— May 1, 1946. Vol. XXXI, Pt. II— Nov. 1, 1947. Editor Edward H. Taylor . Editorial Board . Paul G. Roofe, Chairman Frank E. Hoecker h. b. hungerford Arthur J. Mix 1.1 [' 11 k i; V PLATE I (Reprinted from Science Bulletin XI) Fig. 1. Filaments of Spirogyra before being fed upon by a corixid. Fig. 2. The same after being fed upon by a corixid. Note the empty fila- ments. Fig. 3. Sigara (Vertnicorixa) alternata (Say), our most widespread and common North American corixid. Fig. 4. A highly magnified portion of the Spirogyra shown in figure 2. Note the punctured and empty cells. Fig. 5. The stomach contents of a small corixid nymph after thirty min- utes of feeding on Spirogyra. The above illustrations form conclusive proof of the herbiverous tastes of a water boatman. For further evidence on the feeding habits of Corixidae see Hungerford, H. B., in Science Bulletin Vol. XI, pp. 239-249 (1920). Further studies are in progress, indicating that certain species feed also upon mos- quito lan^ae. Dr. R. I. Sailer reports a Calliconxa species in Alaska that is useful in the control of a pest mosquito there. The color drawings on this plate were made by Miss Ellen Edmonson. COLOR PLATE 1 \ \ U'f- V / ELLEN EDMONSON DEL AD NAT, THE UNIVEESITY OF KANSAS SCIENCE BULLETIN DEVOTED TO THE PUBLICATION OF THE RESULTS OF RESEARCH BY MEMBERS OF THE UNIVERSITY OF KANSAS uiuo. CC^^P. ZflOL ySRARY m 30 19/43 HARVARD UNIVERSITY Volume XXXII University of Kansas Publications Lawrbnce, November 25, 1948 PRINTED BY FERD VOILAND. JR. . STATE PRINTER TOPEKA. KANSAS 1948 22-822 (3) ABSTRACT This paper constitutes a monographic I'evision of the family Corixidae of the Western Hemisphere, inckiding a monograph on the genus Trichocorixa Kirk., by Doctor Reece I. Sailer. Although primarily taxonomic, material is in- cluded on the biology and morphology of the family. Prior to tliis work some 165 species and 6 subspecies were known from the Western Hemisphere. Forty-four new species, including seven by Sailer*, and six new subspecies, including three by Sailer, are presented in this paper. Three new subfamilies are established, the Cymatiinae, the Heterocorixinae, and the Stenocorixinae. New tribes set up are the Agraptocorixini, the Glae- nocorisini (for Glnenocori.sa Thorns., and Dasycurixa n. gen.), and the Grap- tocorixini (for Graptocoriza Hungfd., Ncocorixa Hungfd. and Pftcudoghtrno- corisa Jacz.). Two new genera, Cenocorixa and Dtfic/corixa, are described for, respectively, Arctocorixa mileyce Hungfd. and Glacnocorisa hybrida Hungfd. The following subgenera are described in Signrn: Allosigara for Arctocorisa decoralo Abbott; Aphelosigara for Sigara jarmanae Hungerford; Arctosigara for Arctocorixa conocephala Hungerford; Lasiosigara for Notonecta lineata Forster; Pediosigara for Arctocorisa hydatotrephes Kirkaldy; Phaeosigara for Corisa signata Fieber; Pileosigara for Arctocorixa douglasensis Hungerford; and Xenosigara for Arctocorisa ornata Abbott. The following new species are described: Arctocorisa lawsoni (Colorado); Callicorixa tetoni (Wyoming) ; Cenocorixa andcrsoni (Washington, etc.) ; C kuiterti (California, etc.), and C. sorcnsoni (Utah); Dasycorixa rawsoni (Sas- katchewan) ; Ectcmnostega darivini (Argentina) ; EctemnostcgeUa jamesi (Bo- livia), E. lundbladi (Perii), E. pilosa}ron,s (Peru), E. stridulata (Peru), E. iumidaccphala (Peru), E. venturii (Argentina), and E. woytkoivskii (Peru); Heterocorixa anduzei (Venezuela), H. hintoid (Bolivia). H. jaczcwskii (Brazil), H. lundbladi (Brazil), H. woylkowskii (Peru), and H. wrighti (Brazil); Neo- dgara murilloi (Colombia); Sigara (Tropocorixa) argoitinioisis (Argentina). S. {T.) brazilicnsis (Brazil), S. {T.) cgberta' (Argentina), and S. (T.) robvrti (Brazil); and Sigara (Vermicorixa) cubiensis (Cuba and Porto Rico), S. (V.) ■dejecta (Minnesota, etc.), S. (V.) grossolineata (Michigan, etc.), S. (V.) john- sto7ii (Minnesota), S. (V.) knighti (Michigan), S. (V.) mathesoni (Nova •Scotia, etc.), S. {V .) rnckinstryi (California), »S. (V.) vandykei (California, istc), S. {V.) virginiensis (Virginia, etc.), S. {V.) washingtonensis (Washington, etc.), and Sigara (Pediosigara) depressa. The new subspecies named are Het- erocorixa hesperia venezuelana (Venezuela), Heterocorixa wrighti ollalai (Bra- zil), and Pahnacorixa nana ivalleyi (Kansas, etc.). In addition, Callicorixa noorvikensis Hungerford is reduced to a subspecies of Callicorixa producta (Renter). Up to and including this paper (exclusive of synonyms) there have been described from the Western Hemisphere 209 species and 12 subspecies. These are distributed as follows: in North America, including Mexico, 137 species and 9 subspecies; in Central America and Insular America, 17 species; and in South America and the Galapogos Islands, 58 species and 3 subspecies. * See Sai'er's paper on page 289 for a list of the new species, subspecies, and varieties de- scribed by him in Trichucorixa. (4) NOV 30 1948 THE UNiIvbIsITY OF KANSAS SCIENCE BULLETIN Vol. XXXIII November 25, 1948 The Corixidae of the Western Hemisphere (Hemiptera) il. B. Hdngerford^ University of Kansas* (Including a monograph on the Trichocorixa by R. I. Sailer) CONTENTS PAtiE I. Introduction 7 II. Biology of the Corixidae 8 Habitats * 8 Flight 8 Food 8 Stridulation 10 Mating 12 Oviposition 12 Nymphal life 13 Hibernation 1^ III. Taxonomy of Corixidae 16 The systematic position of the Corixidae 16 Brief history of the taxonomy of Corixidae 18 Generic concepts in Corixidae 26 Identification of Corixidae 36 Technique 36 Glossary 38 Family characteristics of Corixidae 41 Key to subfamilies of Corixidae -13 Diaprepocorinae (not represented in the Americas) Plate IV Micronectinae (represented by Tenagobia Bergroth) 54 Stenocorixinae (not represented in the Americas) 99 Cymatiinae (represented by Cymatia Flor) 99 Heterocorixinae (represented by Heterocorixa B. White) 105 Corixinae : Key . to tribes 1 37 Glaenocorisini 1 37 Glaenocorisa Thomson. Genotype caw/rcois Thomson 138 * Contribution from the Department of Entomology, University of Kansas, with acknowl- edgments to the University of Michigan Biological Station for opportunity to pursue this study during many summers there. (5) 6 The University Science Bulletin PAUE * Dasycorixa Hungerford. Genotype hybrida (Hungeiford), 142 Graptocorixini 150 Graptocorixa Hungerford. Genotype abdominalis (Say) . . . 156 Neocorixa Hungerford. Genotype snowi Hungerford 150 Pseudoglaenocorisa Jaczewski. Genotype hugo- scotti (Hutchinson) (not found in the Americas), Plate Vin 53 Agraptocorixini (not represented in the Americas) Plate IV Corixini contains 20 genera and 13 subgenera 197 IV. Acknowledgments 815 V. Index 819 INTRODUCTION The identification of American Corixidae has been a difficult and discouraging task for many years. The uniformity of shape, simi- larity of color patterns, the lack of obvious structural characters have always made this family a perplexing one. The early de- scriptions of American corixids dealt largely with color patterns, which are both variable and almost indescribable, and were made by European workers whose types were in European museums or by American workers whose types were not designated. When Doctor Abbott undertook his studies (about 1910) the Uhler material was available in this country but the Fieber species were in European museums and were inadequately known. Abbott's own descrip- tions were based upon such characters as were already in use. At the close of his studies (about 1918) he left two new genera and 17 new species names with their types, some of which were not labeled, and two keys, one to the Corixidae of Georgia, 1913 (Bull. Brooklyn Ent. Soc. VIII, pp. 87-91) including 17 species, and one to the Cor- ixidae in "The Hemiptera of Connecticut," 1923, in which he keyed out four genera and in the genus Arctocorisa placed 11 species, 6 of which were his own. It has since been found that he determined correctly but one of Fieber's species. Doctor Abbott's withdrawal from academic work and the taxonomic study of Corixidae left no one in America willing to identify specimens in this family. Since I was engaged in a study of the biology and ecology of Aquatic Hemiptera, this was a serious matter and I was forced to make my own determinations. Therefore, I undertook to find more precise characters to supplement those in use and then to place the species described by Fieber and others. The latter task made necessary a trip to European museums to examine types. During the j'ears since Abbott's time there have appeared two papers on North American Corixidae containing keys, one of them in Blatchley's Heteroptera of Eastern North America, 1926, which keys out seven genera and brings together the descriptions of some fifty-one species, and the use of which would lead to many misdeterminations. The other by Walley, 1930, keys out twenty species recorded from On- tario and Quebec (Can. Ent. LXII, pp. 285-286). Thus with no comprehensive key available and new species appearing from time to time, some review of the American Corixidae has long been desir- able. It is my hope that this paper may prove useful to those who are interested in the Corixidae of the Americas and make possible the study of the biology and ecology of this interesting and unique familv of water bugs. (7) 8 The University Science Bulletin BIOLOGY OF CORIXIDAE For those who find pleasure in collectmg aquatic insects the fol- lowing brief notes on the biology of Corixidae may be interesting. Habitats The Coi^xidae are found for the most parts in i)ools, })onds and lake lagoons where they spend most of their time on the bottom. Some species are found in slowly flowing streams, a few in fast water, and one American species has been taken repeatedly on the bottom of Lake Erie at depths of from fourteen to thirty-five feet ! While the majority live in fresh water, some will inhabit saline or brackish waters. Some species i)refer waters with aquatic vegeta- tion, others more oi)en areas. Some breed only in permanent waters, while others invade the temporary ])ools and i>onds, raise their young and retreat to more stable conditions for the winter. Flights Corixidae normally possess well-developed flight wings and have been taken at trap lights at night and occasionally recorded in large flights. In flight the hemelytra and metathoracic wings are united by a characteristically Heteropterous device. It is situated at the apex of the under surface of the clavus of the hemelytron and con- sists usually of two parallel, short longitudinal ridges between which enters the turned-up portion of the costal margin of the hind w'ing. In the water, of course, the fragile and membranous flight wings are folded beneath the hemelytra which are buttoned down both along the inner vannal margin and the basal costal margin. In certain genera the flight wings are often reduced and nonfunctional as in Palmacorixa, Krizousacori.va and Cymatia for example. Food Corixidae are largely herbivorous. They may forage on the bot- tom, sweeping into the stomach quantities of the organic ooze with its attendant i)opulations, both i>lant and animal, the bulk of the material being of plant origin. In the feeding ]irocess they may ingest, besides the dcsmids, Euglena and other unicellular algae, filaments of Oscillatoria, Zygnema, Mougeotia and Spirogyra. They have been observed to puncture the cells of the larger fila- ments of Spirogyra and suck out the chlorophyll as shown in the colored plate. ^ The ingestion of multicellular organisms and the 1. HunKoifoifl. H. B., 1917, Science N, S. XLV, pp. 336-337; Jl. N. Y. Ent. Soc. XXV, pp. 1-5; 1920 Kansas Univ. Sci. Bull. XI, pp. 234-249. See, also, Sutton, Muriel, 1947 Nature Vol. 160, p. 122. Western Hemisphere Corixidae 9 packing of the stomach with skeins of filamentous algae is indeed unique amongst the sucking insects of the order Hemiptera. The nature and abundance, oi the lood supply of corixids is one expla- nation of their dominance and gives them an advantage over all other families of aquatic Hemijitera which are uniformly predaceous in their feeding habits. There are indeed some species of Corixidae the palae of which are not flattened and spoon-shaped, and which may still be predaceous. Cymatia americana Hussey, for example, has been reported by Hungerford ^ to show cannibalistic behavior in its first instar. Hale, in his studies on Australian Corixidae,'^ says, "For months I kept in aquaria several species of Corixidae as well as members of Notonectidae and Naucoridae and during that time they were fed only upon larvae of Culex fatigans and Scutomyia notoscripta. Even newly hatched Corixidae were observed to cap- ture tiny mosquito larvae, increasingly large examples being taken during the successive stages of the metamorphosis." Poisson, 1935,'* also reported that the large species of Corixa readily captured lar- vae of Culicidae and Chironomidae and believed that the animal food is even necessary to the females at the time of egg laying. This appears to be the conclusion of Haken Lindberg '' also for Calli- corixa producta and Arctocorisa carinata. We believe, however, that Griffith," 1945, has given a fair analysis of the food gathering behavior and food sources of the average corixid. Since most corixids we have observed foraging upon the flocculent ooze in the bottom of the pool now and then swallow Arcella and other small animals, it is not surprising to see their occasional capture of some small insect. Doctor Sailer observed a species of Trichocorixa feed- ing upon its own eggs. Nevertheless, Corixidae as a group may be looked upon as members of the producing class in the waters where they are found and form a link in the food chain between the "nu- tritious salad'' or organisms in the bottom ooze, and typically pre- daceous forms. Gathering their food from the organic ooze at the bottom of the pool or feeding upon filamentous algae, they in turn make forage for the many predatory animals that lurk in the shad- owy places or dart in pursuit of their prey. ■2. Hungerford, H. B., 1923, Notes on the eggs of Corixidae. Bull. Brooklyn Ento. Soc, XVIIl, No. 1, p. 14. 3. Hale, Herbert M., 1922, Studies in Australian Aquatic Hemiptera, No. 1, Corixidae, Records of the South Australian Museum, Vol. II, No. 2, p. 310. 4. Poisson, R., 193.5, Les Hemipteres aquatiques (Sandaliorrhyncha) de la Faune fran- Caise. Arch, de Zool. Exp. et Gen., I.XXVII. Fasc. 2, p. 480. 5. Lindberg, Haken, 1944. C. Griffith, Melvin, 1945, Univ. of Kansas Sci. Bull., XXX, Pt. IT, No. 14. 10 The University Science Bulletin Stridulation Although stridulation has been known among Corixidae since 1845 when Mrs. R. Ball and Miss M. Ball "' recorded that Corixa striata Curt, was capable of producing two quite different sounds, it was not until 1935 that the way in which the sound is produced was explained by Heinz von Mitis.^ He also was working with Euro- pean species of Corixidae. According to his observations, in the Corixinae neither the strigil nor the palar pegs of the male have anything to do with the soimd production. Only those species in which the males are equipped with a field of pegs on the base of the front femur are capable of producing sound, and the sound is pro- duced b}' rubbing this peg field over the sharp lateral cephalic mar- gin of the head. The tone thereby formed is given resonance by the air chambers in head and prothorax. In the Micronectinae von Mitis observed Micronecta meridionaUs Costa and concluded that the strigil is an essential part of the strong tonal device of these insects. In our American Corixidae the only published record of sound production is by Hungerford ^ who heard Palmacorixa buenoi Ab- bott chirp in an aquarium one cloudy afternoon. From the struct- ural evidence, the Krizcnisacorixa should be the loudest sound producers among our American water boatmen. The males have re- markably devclojDed peg fields on enlarged anterior femora and a thickened margin on the head which, with the prothorax, is in- flated. American Corixidae which should be capable of sound pro- duction are the males of the following: Knzousacorixa jemorata (Guerin) Knzousacorixa azleca Jaczewski TrichocorixeUa viexicana (Hungerford) Pa.Jwncorixa gillctlii Abbott Palmacorixa nana Walley Palmacorixa nana walleyi Hungerford* Palmacorixa buenoi Abbott Corisella decolor (Uhler) Corisella tarsalis (Fieber). Corisella tarsascana Jaczewski Corisella hidalgoensis Hungerford* Ectemnostegclla nujniana Lundblad Ectcmnostegella slriduJata Hungerford''' Pseudocorixa conata (Hungerford) Pseudocorixa beameroidea (Hungerford) 7. Ball, Mrs. R.. and Miss M. Ball, lS4ri. Rep. British Asoc. XV, iip. 6i-C,o; 1S46. Ann. Mag. Nat. Hist. XVII, pp. 135-136. 8. Yon Mitis, Heinz, 1935, Zur Biologic der ('(irixiden. Stridulation. Zeitschrift fiir Morphologie und Okologie der Tiere XXX, pp. 479-495. 9. Hungerford, H. B., 1920, The Biology and Ecology of .\quatic and Scmiaquatic He- miptera. ITniv. of Kansas Science Bulletin XI, p. 228. * New species in this paper. Western Hemisphere Corixidae 11 Arctocorisa pJanifrons (Kirby) Arctocorisa sutilis (Uhler) Arctocorisa carinata (Sahlberg) Arctocorisa chnnceoe HungcifonI Arctocorisa convexa (Fieber) Arctocorisa lawsoni Hungerford* Callicorixa vidnerata (Uhler) and possibly others, for C. p^'aeusta (Fieber) has been heard to stridulate and its stridular area is not conspicuous. Hesperocorixa escheri (Heer) Hesperocorixa georgiensis (Egbert) Hesperocorixa harrisii (Uhler) Hesperocorixa interrupta (Say) Hesperocorixa lobata (Hungerford) Hesperocorixa lucida (Abbott) Hesperocorixn martini (Hungerford) Hesperocorixa vulgaris (Hungerford) Sigara (.Tropocorixa) chrostowkii Jaczewski Sigara (Tropocorixa) brachypala (Hungerford) Sigara (Tropocorixa) toivnsendi (Hungerford) Sigara (Tropocorixa) czakii Jaczewski Sigara (Tropocorixa) dcnseconscripta (Breddin) ** Sigara (Tropocorixa) deuseconscriptoidea (Hungerford) Sigara (Tropocorixa) dita Jaczewski Sigara (Tropocorixa) forciceps (Spinola) Sigara (Tropocorixa) hosfordcp (Hungerford) Sigara (Tropocorixa) rubyce (Hungerford) Sigara (Tropocorixa) schadei (Hungerford) Sigara (Tropocorixa) santingiensis (Hungerford) Sigara (Tropocorixa) argentiniensis Hungerford* Sigara (Tropocorixa) boliviensis Hungerford Sigara (Tropocorixa) femoridens Hungerford Sigara (Tropocorixa) termasensis (Hungerford) Sigara (Tropocorixa) trimacxdata (LeGuillou) (—jazi (Hungerford) Sigara (Subsigara) jallcnoidea (Hungerford) Sigara (Pilcosigara) douglaserms (Hungerford) Sigara (Phaeosigara) viabropala (Hungerford) Sigara (Phaeosigara) compressoidea (Hungerford) Sigara (Phaeosigara) mackinacensis Hungerford Sigara (Phaeosigara) zimmermanni (Fieber) (=compitssa (AbboK) Sigara (Phaeosigara) signata (Fieber) Sigara (Phaeosigara) quebecensis (Walley) Sigara (Phaeosigara) mississippiensis Hungerford Sigara (Phaeosigara) bradleyi (Abbott) Sigara (Phaeosigara) sigmoidca (Abbott) Sigara (Phaeosigara) paludata Hungerford Sigara (Phaeosigara) macrocepsoidea Hungerford Sigara (Phaeosigara) dolabra Hungeiford & Sailer Sigara (Vermicorixa) scabra (Abbott) Sigara (Vermicorixa) dejecta Hungerford* Sigara (Vermicorixa) gordita (Abbott) Dasycorixa hybrida (Hungerford) • Dasycorixa johanseui (Walley) Dasycorixa rawsoni Hungerford* Cenocorixa imleyce (Hungerford) Cenocorixu. andersoni Hungerford* Cenocorixa expleta (Uhler) Cenocorixa hlaisdeUi (Hungerford) 12 The University Science Bllletin (Jcnocorixa utaheiisis (Himgerford) denocorixa dakotensis (Hungerford) Ccvucorixa hifida (Hungerford) Ccnocorixa kuiterti Hungerford* Mating Mating takes place in the water, the male mounting the female and embracing her with his front legs, his usually flattened face closely appressed against her dorsum and his abdomen, if dextral, curved around the left side of the female, if sinistral, around the right side. In cases of reversed asymmetry Doctor Poisson ^^ has found in Corixa afjinis and Sigara sahlbergi that these abnormal males have no trouble mating with their females but do so by di- recting the abdomen to the opposite side from that which is normal. It seems probable that both the palar pegs and the strigil assist the male in a firm clasp of the female during copulation. That these are not essential in all species is indicated by the Callicorixa and some others that lack the strigil, and by Cymatia which lacks both palar pegs and strigil. OVIPOSITION We know nothing of the egg laying habits of the subfamilies Diaprepocorinae, Stenocorixinae and Heterocorixinae. Of the Micronectinae the eggs of Micronecta mcridionalis and Micronecta potveri were figured by Poisson, 1938. The eggs of both species are attached horizontally to their support; that of the former is cov- ered with projections, that of M. poweri is not. Neither the shape of the egg nor its method of attachment is like that of the Corixinae. It would be interesting to determine the egg laying habits of the genus Tenagobia which, in the Western Hemisphere, is the counter- part of Micronecta. The eggs of the Cymatiinae and Corixinae are better known. The eggs of these Corixidae are more or less top- shaped and attached to their support by a buttonlike disk.^^ Be- tween the disk and the egg there is a very short stem in most species but in some genera, Cymatia, Agraptocorixa and Krizousaconxa for example, the egg is supported on a stalk of considerable length. The eggs are attached to any available support the water affords and it is not uncommon to find the underside of lily pads and submerged brush solidly covered with them. Their astonishing numbers in the water is more nearly appreciated when we recall that they have been gathered by the Mexicans from reeds submerged for the pur- 3 0. Poisson, R., 193'), Arch. Zool. Exp. et Gen. LXXVII. p. 4Tr>. 11. For striicturc nf corixid PCS'* «<"(' Poisson, lIlS'). .Vicli. Zool. K\|i. I't Gen. "7, Fasc. 2. Western HexMisphere Corixidae 13 pose and utilized by them as food. The American genus Rainpho- corixa, wliich inhabits muddy pasture ponds, has the curious habit of phicing its eggs on the carapace of the crayfish. P^iG. 1. The ¥.ii\i< of Corixidae. (1) Ramphucorirn acuminnta (Uhl.), after H. B. Hiingerford, 1923, Bull. Brookl. Ent. Soc, XVIII, PI. I, fig. 4; (2) Siyara iV ermicorixa) alternata (Say), after H. B. Hungerford, 1917, Jl. N. Y. Ent. Soc, XXV, PI. 9, fig. 1; (3) Krizouf;acorixa jcmurata (G.-M.). after Giierin-- Meneville; (4) Micronectn poiceri (D. & S.), after R. Poi.sjson, 1938, Ann Soc. Ent. Fr.. CVII, text fig. 42; (5) Micronecta merklionalis (Costa), after R. Pois- son, 1938, Ann. Soc. Ent. Fr., CVII. text fig. 14; (6) Sigara (Sigara) striata (L.), after R. Poisson, 1935, Ann. Ent. Soc. Fr., CVII, text fig. XVII A; (7) Agraptocorixa eurynome (Kirk.), after H. H. Hale, 1922, Records of the South Australia Museum, II, No. 2, p. 311, fig. 339 B; (8) Cymatia americana Hus- .sey, after H. B. Hungerford, 1923, Bull. Brookl. Ent. Soc, XVIII, PI. 1, fig. 4. Nymphal Life Corixidae undergo five nymphal instars as do the majority of aquatic Hemiptera. The wing pads show plainly, beginning with the third instar at which time the spiracles become functional. Scent glands open by paired pores on the caudal margin of the third, fourth and fifth dorsal abdominal segments. In the adult these glands are replaced by a metathoracic gland opening into scent gland orifices laterad of the middle coxae (see plate III). The nymphs have two segmented antennae, one segmented hind tarsi, and the pala and tibia of the front leg is a single segment. There may be one or two generations a year depending upon the species 'or the climate. 14 The University Science Bulletin PLATE II Life History of a Boatman (Reprinted from "Life History of a Boatman." by H. B. Hungerford, Jl. N. Y. Ent. Soc. XXV, No. 2). Fig. 1. Egg of Sigara (Vermicorixa) alternata (Say). Fig. 2. Adult of Sigara (V.) alternata (Say). Fig. 3. Egg of an unknown small corixid. Fig. 4. First instar nymph of Sigara (V.) alternata (Say). Fig. 5. Second instar nymph of S. (V.) alternata (Say). Fig. 6. Tarsus and claws of hind leg of first instar nymph. Fig. 7. Third instar nymph of S. {V.) alternata (Say). Fig. 8. Egg shell after nymph has left it. Fig. 9. Fourth instar nymph of S. (V.) alternata (Say). Fig. 10. Front leg of late fifth instar nymph, showing tibia and tarsus of adult within the terminal nymphal segment. Fig. 11. Fifth instar nymph of S. (V.) altcmala (Say). Fig. 12. The front leg of the male. Fig. 13. Ventral view of the abdomen of the female. Fig. 14. Antenna of third instar nymph. Fig. 15. Antenna of late fifth instar nymph, showing the three distal seg- ments of the adult in the terminal nymphal segment. Fig. 16. Antenna of the adult. Fig. 17. Ventral view of the abdomen of a male, showing charact/eristic male asymmetry. Western Hemisphere Corixidae 15 16 The University Science Bulletin Hibernation Poisson. 1935, says that Micronecta winters in the larval stage, chiefly in the second instar. The majority of the Corixinae winter as adults, although Poisson, 1935. found that Corixa affinis may winter olso in the egg stage and Griffith, 1945.^^ repor^^s some eggs of Fnmvhocorixa acuminata (Uhler) as passing the winter success- fully. T^e species also winter as adults. Hunserford, 1920, found that Palmncorixa buenoi Abbott wintered at Ithaca. N. Y., as fourth instar nymphs. Farther south adults of this species have been t"ken in the winter time. Hussey, 1<^21.^^ found Cvtnatia americana Hus- sey in Minnesota on January 15 under two feet of ice in air bubbles in the ice. Corixids of various species may be taken in midwinter swimming beneath the ice. TAXONOMY OF CORIXIDAE The Systematic Position of the Corixidae TliH' first corixids described were placed under NotonpctU' in ^^he Hemiptera. Leach, 1817.^ pieced them in his tribe Nntonectides and considered the genera Corixa Geoffrey and Sigora Fabricius as comprising a famdv separate from Notonecta Linn, and Plea Leach. Then Borner. 1904,- proposed to place the Corixklae in a new sub- order, Spndaliorrhyncha. because they are structufallv so diff-^rent from other Hemipterous insects. Reuter, 1912^ reduced Sandalior- rhyncha to series rpnk and proposed Corixoideiie as a superfamily with the sinp'le family Corixidae in it. Oshanm, 1912 •* and Van Duzee. 1917.'' accepted Reuter's proposal but Torre-Bueno. 1917,*' thought that Sandaliorrhyncha sl^ould have ordmal rank. Borner, 1935.^ mad" the followins proposal: "Subordo: Heteroptera. uber- familie: Hydrocorisae (Cryptocerata). Familienreihe: Corixoidea (Sandaliorrhyncha). Familien: Sigaridae, Corixidae." In ano+her paper appearing the same year ^ and apparently written earlier Bor- ner used the same major divisions but in the one family, Corixidae, ]ilaced the "Unterfam. Corixinae" with the genera Cymatia Flor, 12. GriflRth,,M. E., 191.5, Univ. of KRnsas Sci. Bull. XXX, Pt. II, No. 4, p. 27H. 13. Hn.ssey, Roland, 1921, Psyche, XXVIII, p. P3. 1. Leach, William Elford. Brewster's Eclinhg. Encyc. IX, ]>. 124, 1815; Am. cfln. VIII, p. 713, 1832.' 2. Borner, Carl. Zool. An'ieg. XVII, p. 522. 3. Peuter, O. M. Of. Finska Vet. Soc. Forh. LIV, Afd. A. No. 6, pp. 13, 48. 4. Oshanin, B. F. Kat. Palae. Hemip., p. 91. 5. Van Duzee, E. P. Cat. of Hemiptera of America . . . , p. 476. f>. Torre-Bueno, J. R. de la. Ann. Ent. Soc. Am. IX, p. 353. 7. Borner, Carl. Ent. Beihefte aus Berlin-Dah'em 1, pp. 138-144. 8. Biirner, Carl. In Tierwelt Mitteleur, Leipzig 4 i Tiel, 3 Lief. X, pp. 10-lU Western Hemisphere Corixidae 17 Corixa Geoffr., Callicorixa B. White, and Sigara Fabr. and the "Un- terfam. Micronectinae." It is not clear to me why Doctor Borner used Sigaridae instead of Micronectidae. The proposal of Douglas and Scott, 1865, to make separate families of Corixidae and Sig- aridae was not accepted and Borner's suggestion is not followed by Stichel, 1935, and several other workers since that time. In 1930 Mr. H. P. Jones established the family Micronectidae, and Kirit- shenko, since 1938, has used the families Micronectidae and Corix- idae. Before I agree with Mr. Jones and Doctor Kiritshenko I wish to see the eggs of Tenagobia and Diaprepocoris. The shape of the Micronecta egg is very different from that of the other corixid forms that are known. The consensus of opinion, however, appears to be that there is only one family, and that this family is sufficiently different from other Hemiptera to be set apart by some higher category. Accord- ing to Mr. China's ^ Heteropterous family tree, the branch bearing the Corixidae and Notonectidae split off from the Heteropterous trunk very early and was itself separated into the notonectid and corixid branches at an ancient date. It seems to me, however, that the branch that gave rise to the Helotrephidae, Pleidae and No- tonectidae should be closer to the Naucoridae than to the Corixidae, and with this idea Mr. China now concurs. The Corixidae have unique mouthparts and front legs which, with the possession of scent glands on the abdominal dorsum of the nymphs, set them quite apart from other aquatic Hemiptera. From a study of the genera of Corixidae living today we believe that the ancestral Corixidae had ocelli and a well developed scutel- lum as the Diaprepocorinae still do. In the primitive males prob- ably there was little, if any, abdominal asymmetry and no strigil. The loss of a strigil in Callicorixa, in some Tropocorixa and a few others appears to be secondary. Since the corixid mouthparts and the modifications of the front legs are intimately related to the feeding habits, it is desirable to decide whether the ancestral form was herbivorous, sucking the chlorophyll from plants, or predaceous upon other animal forms. Tillyard,^" judging from wing remains, traces the Homoptera to the Lower Permian and recognizes no Heteroptera until the Triassic. He says that "comparative morphology indicates that neither of the existing suborders is derived from the other but both from a lost 9. China, W. E. Ann. Mag. Nat. Hist., Ser. 10, Vol. XII, pp. lW-196. 10. Tillyard, R. J. 1926 Amer. Jl. Sci., XI, p. 382. 2—822 18 The University Science Bulletin common ancestor." Since the Homoptera are herbivorous, it seems logical that the primitive Heteroptera were also herbivorous. How- ever, it does not necessarily follow that the first corixids were her- biverous. The wide spread habit of the Corixidae of gathering their food from the fiocculant bottom ooze of their aquatic habitat, with its attendant population of algae and other organisms, may have been a modification from the habit of extracting the chlorophyll from large filamentous algae, to ingesting whole filaments of the finer algae and then to sweeping in the desmids and other organisms in the coze. On the other hand, predaceous forms may have taken to gathering the populations of the bottom material and gaining more and more sustenance from the plant life until some have learned to tap the chlorophyll from filaments too large to ingest. It appears that the long slender pala of Cymatia, Stenocorixa and Diaprepocoris is more primitive than the broad spoon-shaped pala of thoso that gather micro-organisms, in which case the evidence in- dicates that early corixids were predaceous. Brief History of the Taxonomy of the Corixidae Linnaeus, 1758, described the first corixid under the name No- tonecta striata. Geoffrey, 1762, proposed the generic name Corixa for a large species which he figured but misidentified as A'', striata Linn, which is a smaller species. Fabricius, 1775, proposed the gen- eric name Sigara for N. striata Linn. Illiger, 1807, in a work unfor- tunately long overlooked by Hemipterists, correctly used the name Sigara and identified S. striata (Linn.) as the small species with transverse lines, and showed how it differed in both size and color pattern from Geoffrey's Corixa striata which he renamed C. punc- tata. Leach, 1815, divided his tribe "Notonectides" into two fam- ilies, Notonectida in which he placed Notonecta Linn, and Corixida in which he placed Corixa Geoffrey. He apparently considered Sigara Fabricius a synonym of Cmixu. Then in 1817 t he again divided his tribe "Notonectides" into two families, one containing Notonecta and Plea, and the other S'gara and Corixa. In Sigara he placed Sigara minutissima {=Noton£cta minutissima Linn.), having a distinct scutellum, and in Corixa he placed C. coleoptrata (Fabr.), C. striata'' (Linn.) and added as new C. stagnalis, C. jossarum, C. lateralis, C. dorsalis,'' C. geoffroyi and C. offinis. It is noteworthy t Leach, W. E. Trans. Linn. Soc. London, XII, Pt. I, pp. 10-18, 1817. I have seen this bibliographic entry dated 1818 but Van Duzee gives it 1817. * Cliina, 19S8, reports that Doctor Jaczewski examined the Stephens collection in the Brit- ish Museum. Tliis collection was contemporaneous with Leach and if the determinutions apreed wilh Li-acli, C striata Leach = C. sahlbergi Fieber and C. dorsalis Leach — S. strtata Linn. Western Hemisphere Corixidae 19 that he separated the last two from the others by their glabrous hemeltyra and pointed out that C. geoffroyi was the species serving as the type of Corixa Geoffroy. Fieber, 1851, in his "Species Generis Corisa" gave an historical review of the literature and treated in this paper all of the Corixidae except the very small species with a distinct scutellum which, fol- lowing Leach, he assigned to Sigara. Fieber's Corisa comprised fifty-one species, plus twenty other names of kinds he had not seen but one of which he renamed. It included C. geoffroyi Leach (== C. punctata Illig.), now recognized as the type of Geoffrey's Corixa; C. coleoptrata Fabr., the type of Cymatia; C. praeusta, the type of Callicoiixa; C. hyalinipennis Fabr., now in Agraptocorixa; C. ver- ticalis, the type of Trichocorixa ; C. germarii, now in Arctocorisa; C. kollarii, now in Centrocorisa; and a species which he misnamed C. carinata Sahib, which is a Glaenocorisa. Thus Fieber's concept of Corixa was a broad one and his "Corisa" has been broken down into many generic and subgeneric groups by subsequent workers. The name Sigara, however, following Leach, was applied to the very small corixids for many years. Then Kirkaldy, 1897, pro- posed for them the genus name Micronecta with Notonecta minu- tissima Linn, as the genotype and stated that Corixa Geoffroy, 1762, and Sigara Fabricius, 1775, were absolutely identical. Since Kirk- aldy accepted Geoffroy's genera as valid and considered the geno- types the same, he thought he had disposed of Sigai^a. However, Schumacher, 1924, who did not accept the validity of the Geoffroy genera before 1775 again raised the question of "Sigara vs. Corixa" and concluded that Corixa Geoffroy was a synonym of Sigara. In this paper he called attention to Illiger's long-overlooked work of 1807 in which the Corixa figured by Geoffroy was named C. punc- tata and described as twice the size of C. striata and without trans- verse lines on its elytra. Thus C. geoffroyi Leach, 1817, is a syn- onym of C. punctata Illiger, 1807. It has been our unwavering opinion: first, that Geoffroy's genera in Histoire Abregee des Insectes, 1762, are valid and, second, that C. striata (Linn.) and C. punctata Illiger are not congeneric. We have taken no part in the published discussions of these questions but regret some of the proposals that have been made. It is gratify- ing to see that Mr. China, 1943, in his Introduction to "The Generic Names of British Hemiptera-Heteroptera . . ." recognizes that Opinion 46 of the International Commission validates Geoffroy's 20 The University Science Bulletin genera of 1762. Mr. China, 1938, plainly pointed out that the geno- types of Sigara and Corixa are not congeneric and that neither of the two genera can ever be synonymous with the other. While in his "Generic Names of British Insects" he tentatively accepted Wal- ton's proposal to place all generic names except those of Glaeno- corisa Thompson, Cymatia Flor and the Micronectinae as subgenera of Corixa Geoffroy, he recognized that such an arrangement might be rejected later. Moreover in "Some Remarks on Walton's Natural Classification of the British Corixidae," 1943, in The Entomologist's Monthly Magazine, Vol. LXXIX, pp. 109-111, Mr. China points out that the relegation of Sigara Fabr. as a subgenus of Corixa Geoffr. by Walton in no way disposed of the question he had discussed in his 1938 paper. Whether as genera or as subgenera the genotype of Corixa is C. punctata Illiger and that of Sigara is C. striata (Linn.). We maintain that both represent good genera. Even Leach, 1817, without noting the sinistral asymmetry of the males of his C. geof- fr oyi and C. affinis, separated them from the other corixids by their glabrous hemelytra, and Fieber, 1851, on the same character, placed C. geoffroyi Leach and his own C. xanthosoma, C. panzerii, C. atomaria (== C affinis Leach), C. macrocephala (= C. punzeri Fieb.) and C. platycnemis together. Whether Fieber did not try to establish any related groups based upon closer affinities between the different species of Corixidae as stated by Jaczewski or did at- tempt to do so, I do not know. Nevertheless, his interpolated key characters did bring some other related species together also as, for example, C. verticalis, C. pygmaea and C. burmeisterii, now in Trichocorixa, and C. bonsdorfii Sahib, and C. coleoptrata Fabr., now in Cymatia. Flor, 1860, proposed Cymatia as a subgenus, and Douglas and Scott, 1865, raised it to generic rank. Thomson, 1869, noted that the C. geoffroyi group had the copulatory apparatus directed to the left and proposed for it the subgenus Macrocorisa which must be recognized as a synonym of Corixa. He also proposed the subgenus Glaenocorisa. Up to this time we find the characters used in the taxonomy of Corixidae were those set forth by Fieber. This author knev; that there is sexual dimorphism of the abdomen and pala, and used the shape of the pala, the facial impressions and their pilosity, the ras- trate or nonrastrate surface of the pronotum and hemelytra, the pilosity of the hemelytra, the shape of the pronotum, with or with- out carina, the shape of the metaxyphus and color pattern. Un- Western Hemisphere Corixidae 21 doubtedly he gave too great importance to color. Unfortunately the species Fieber studied and figured to show the asymmetry of the male abdomen was his Corisa praeusta which lacks a strigil. As a result it was Buchanan White, 1873, who was the first to dis- cover and describe the strigil in twenty species, to point out that in the males of Macrocorisa Thomson the strigil is on the left side, and that in the C. praeusta Fieber group and in Cymatia there is no strigil. For the C. praeusta group he proposed the name Callicorixa. He also named the genus Oreinocorixa, which is a synonym of Glaenocorisa Thomson. White's study of the strigil was an im- portant contribution to the taxonomy of the Corixidae. Then Kirkaldy (1901-1903) studied and figured the arrangement of the pegs on the male pala of twenty-three species of Corixidae, demon- strating that the number and arrangement of the pegs had specific value. He also figured the pala of Cymatia and of Micronecta and illustrated the field of pegs on the femur of the male of C. geofjroyi Leach. Since then the discoveries of White and Kirkaldy have been used in describing new species of Corixidae. Kirkaldy 's work from 1897 to his untimely death in 1910 had a marked effect on corixid taxonomy. His use of generic names was followed by other workers for a considerable time. He used Corixa Geoffroy for sinistral species; Arctocorisa Wallengren for dextral species with a strigil ; Callicorixa White for dextral species ' without a strigil ; Cymatia Flor, and Glaenocorisa Thomson. He proposed the fol- lowing names for new genera or subgenera: Diaprepocoris 1897, Micronecta 1897, Agraptocorixa 1898, Trichocorixa 1908, and Hes- perocorixa 1908. There were also known in Kirkaldy 's day the fol- lowing: Heterocorixa White, 1879, and Tenagobia Bergroth, 1899. Abbott (1912-1916), in the short time he studiid North American Corixidae, added the genera Ramphocorixa and Palmacorixa and described a total of 17 species, 6 of which are synonyms. He fol- lowed Kirkaldy in using Arctocorixa for most dextral American corixids, but either ignored or overlooked Kirkaldy's proposal to establish as a subgenus of Arctoconsa the name Trichocorixa for the small American species with C. pygmaea Fieb. as genotype (a syn- onym of C. verticalis Fieb.), and used the name Corixa for them in- stead because the males are sinistral. No new structural characters were discovered by him. With Abbott's withdrawal from biological work to become commercial attache in the American embassy in Tokyo, Japan, I found it necessary to undertake the determination of American Corixidae myself. During the winter of 1916-'17 at 22 The University Science Bulletin the suggestion of H. H. Knight, who was finding the male genitalia of Miridae useful in species fixation, I explored the possibilities of these structures in Corixidae and various other aquatic and semi- aquatic Hemiptera and found them useful. In 1920, in a paper en- titled "The Male Genitalia as Characters of Specific Value in Cer- tain Cryptocerata" which appeared in the University of Kansas Science Bulletin, Volume XI, I stated that I was engaged in pre- paring a monograph of the Corixidae and that drawings of their genital parts would appear later. The paper was presented to call attention to the possibility of using the genitalia of the males of some of the aquatic and semiaquatic Hemiptera, a line of characters not hitherto used, in their taxonomy. In this paper I wrote: "A searching examination of some of the related families has shown some of them to possess quite specifically distinct genital charac- ters. The males of Gelastocoridae, Notonectidae and Corixidae have genital claspers attached to a capsule-like segment which is capable of being withdrawn into the body and thus lies hidden. This strongly chitinized capsule is but loosely attached to the body wall and can therefore be drawn forth and removed from the bug in toto without the least injury or mutilation to the external features of the specimen." Jaczewski, 1921 (and Gajl) in Rozpr. i Wia'd. z Muz. Dzied. Lwow 5/6 1919/1920, pp. 142-150, in discussing the differ- ence between Arctocorisa scotti D. and S. and A. fossarum (Leach), figured the right genital claspers of the males. Lundblad, 1923, in Annales de Biologie Lacustre XII, p. 307, called attention to the taxonomic value of male genitalia of Corixidae and the abdominal segments and figured these parts in comparing A. prominulu (Thoms.) and A. fossarum (Leach). Then came Jaczewski's splendid paper on the "Revision of the Polish Corixidae" 1924. In his work he gave due attention to characters already in use, such as the facial impression of the males, the pubescence of the face in both sexes,, the greater or smaller prominence of the eyes and their distance from the posterior margin of the vertex, the length of the head as seen from above compared with the length of the pronotum, the skape of the male pala and its peg arrangement, the shape of the metaxyphus, which he used more precisely than did Fieber, and the male abdomen and its strigil. In addition he made a number of useful contributions to the taxonomy of the Corixidae. He figured the right or left clasper of the male genital capsule of each species which is an excellent aid in identifying it. He found that the rela- tive length of the last two antennal segments have taxonomic value; Western Hemisphere Corixidae 23 that the front legs of the males, beside their palae, may have other characteristics such as the pubescence of the trochanter, the hairs and pegs on the anterior surface of the femur, the spiniform bundle of hairs on the apex of the tibiae and some others. He gave the rel- ative length of the various segments of the middle and hind legs and called attention to the short spines on the upper surface of the hind femora. He gave special attention to the shape of the lateral lobes of the prothorax and was able to use this character in setting up the subgenus Anticorixa. Certainly Jaczewski's Revision of the Polish Corixidae not only paved the way for further study of Euro- pean Corixidae but has been helpful in other lands as well. He recog- nized the genera Cymatia Flor, Glaenocorisa Thomson, Corixa Geof- frey and used Callicorixa B. White to include both Callicorixa and Arctocorisa of authors. He then arranged the sixteen Polish species belonging to Callicorixa (sens, lat.) into four groups: Group fos- sarum, Group concinna, Group limitata, and Group sahlbergi. Un- der "Incertae sedis" .he placed C. fabricii (Fieb.), C. striata (L.), C. praeusta (Fieb.), and C. hellensi (C. Sahib.). Why there should have been anything uncertain about C. praeusta (Fieb.), I do not understand. It is the genotype of Callicorixa B. White and his ad- dition of the subgenus Anticorixa for his Group sahlbergi under' Callicorixa obligates the use of Callicorixa also as a subgenus which fixes the position of C. praeusta (Fieb.). The correctness of his groups is indicated by the subsequent proposal of Subsigara by Stichel, 1935, for his Group fossarum; of Vermicorixa by Walton, 1940, for his Group concinna; and of Retrocorixa Walton, 1940, for his Group limitata. We now have several additional subgeneric names to designate other groups of this same generic complex; for example, Parasigara Poisson, 1935, Halicorixa Walton, 1940, Tropocorixa Hu'chinson, 1940. This still leaves us with a number of unnamed groups with better definition than several of those already named and a consid- erable number of species that are more distinct, one from another, than are the named groups. Must each of these then have a sub- generic name assigned to it? What advantage is such a plan over the group designation of Jaczewski when it is impossible to make a really workable key to poorly defined subgenera? I have no sat- isfactory answer to these questions, but to be consistent with the pattern already set, one must name them all. In subsequent years Jaczewski corrected certain errors of his 1924 paper. In 1927 he replaced his Callicorixa {sens, lat.) by Sigara, 24 Thk University Science Bulletin revised his groupings in 1929, and has contributed substantially to our knowledge of Corixidae, including two good papers on his own collections in Brazil, S. A., and in Mexico. In ]916 Doctor 0. Lundblad began his valuable and well illus- trated contributions on Corixidae including not only his "Studien iiber Schwedische Corixiden" (1925 to 1928) but the reexamination, redescription and adequate drawings of Fieber and other types, pre- viously inadequately known, and the description of new species from both hemispheres. He not only used both claspers and the male genital capsule but called attention to useful characters in pre- viously described species that had been overlooked. Indeed the third decade of the twentieth centuiy marked the beginning of re- newed interest in the Corixidae. Besides the writings of Jaczewski and Lundblad, H. M. Hale, 1922, reported his study of the Corixidae of Australia, proposing a new genus and describing new species. Hutchinson, 1929, revised the Notonectidae and Corixidae of South Africa. In 1925 I began a series of paper on new Corixidae, and in 1928 spent the year in European museums examining types in prepa- ration for this paper. Poisson, of France, also published his first corixid paper in this decade as did Walley of Canada. More recently, 1943, Walton of England has proposed "A Natural Classification of the British Corixidae'' in which he proposed to submerge Sigara Leach, Callicorixa White, etc. as subgenara of Corixa Geoffroy. Thus anyone interested in a world catalogue of Corixidae has had a per- plexing problem. From 1924 to 1927 some new species were described under Callicorixa {sens, lat.) andin the following years under Sigara, while I was still describing species under Arctocorixa , following both the spelling and the concept as accepted by Van Duzee in his cata- logue. I never accepted Callicorixa sens. lat. as proposed by Jac- zewski, 1924, and my use of Sigara in recent years has not been with the thought that it included Callicorixa. I agree in general with Lundblad's concept of Callicorixa B. White as expressed in his "Studien iiber Schwedische Corixiden" VI, 1927, and our position on other groups will be indicated elsewhere. In this present paper we have used only such characters as appear to have any significance in describing a given species. We have in- troduced some new characters for the separation of subfamilies such as the presence or absence of the embolar groove in the hemeltyra, the presence or absence of the nodal furrow, the position of the media vein in the hemeltyra, and the position of the hypo-ocular suture; for the separation of tribes, the shape of the metathoracic Western Hemisphere Corixidae 25 episterniim ; for the separation of genera, the width of the infra- ocular portion of the head, the shape of the face and beak, the inner angle of the eyes, the priiinose areas of the claval suture, and the shape of the eighth abdominal sternite in the females; for the sep- aration of species, the shape of the mesoepimeron, the position of the scent gland orifice, the length of the pruinose area beyond the nodal furrow, the relative length of the meron, and the shape of the lateral lobes of the eighth abdominal segment in the female. All other characters used in our keys have been employed previously. Since this is a paper dealing with the Corixidae of the Americas, some historical facts should be noted. The first corixid to be de- scribed from the new world was Notonecta lineata Forster, 1771, a longitudinally striped little species from Canada and the Great Lakes area. The second was Corixa nigripennis Fabricius, 1803, from Insular America. Then Thomas Say, 1825-1832, described five species from North America. Kirby, 1837, named one from Canada. Le Guillou, 1841, described one from Chile, S. A., and Guerin-Meneville, 1844-1857, named four species from Insular America and Mexico, one of which is a synonym. Herrich-Schaef- fer, 1850, described one species which is a synonym. Fieber, 1851, made a substantial contribution to American Corixidae by describ- ing thirteen species, three of which are synonyms, thus doubling the number of species known from the new world. Spinola, 1852, de- scribed one species. Heer, 1853, in a publication long overlooked, described a species from northwestern United States. Stal, 1859, named two species, one a synonym. Uhler, a well-known American Hemipterist, described, betw^een 1875 and 1897, a dozen species from the United States, one of which is a synonym. During this time Buchanan White, 1877-1879, described one species from Hawaii and six species and one variety from South America, for one of which he proposed the new genus Heterocorixa. Only three of his Tenagobia have proved to be good species and his Hawaiian species is a syno- nym. Signoret, 1885, named one South American species and Bred- din, 1897, another. Kirkaldy, 1899-1908, described five species and renamed another. Three of his species were from North Carolina, one from Ecuador and one from Costa Rica. Champion, 1901, named six corixids, one of which had to be renamed, and two are synonyms. Abbott, 1912-1916, proposed two new genera and de- scribed seventeen North American species, six of which are syno- nyms. Torre-Bueno, 1918, described a new species from Antigua which proved to be a synonym. Hussey, 1920, described a new 26 The University Science Billetin species of Cymatia /rum Minnesota. Hungerford, 1925, to and in- cluding this paper, has named 104 species and 6 subspecies. Two of these are synonyms. Blatchley, 1926, who admittedly did not know the Corixidae but was forced to do the best he could with them in his well-known Heteroptera of Eastern North America, de- scribed two species, both synonyms. Lundblad, 1928-1931, has de- scribed e'ght species and one variety (raised by Deay to specific rank) , all from South America. This includes two synonyms. Jac- zewski, 1927-1933, has named seventeen species and two varieties, of which three species are synonyms. Walley, 1930-1936, named twelve species and one variety. Three species are synonyms. Deay, 1930-1935, monographed the genus Tenagobia and described six species of which one has turned out to be a synonym. Sailer, whose monograph on the Trichocorixa is included in this paper, names seven new species and three subspecies. He is also co-author with Hungerford on another species. Miss Egbert has described one new species in the Anticorixa group (Hesperocorixa) and has brought to my attention several others described in this paper. There are, therefore, known to date, 209 species of Corixidae and 12 subspecies from the Americas. Of these, 137 species and 9 subspecies are from North America, 14 species from Insular and Central America, and 58 species and 3 subspecies from South America and the Galapagos. Concerning Generic Concepts in Corixidae In Hutchinson's "A Revision of the Corixidae of India and Ad- jacent Regions," 1940, is included G. A. Walton's ''Classification of the Family" in which Walton proposed to place the following as subgenera of Corixa: Arctocorisa Wall., Callicorixa B. White, Neo- sigara Lundbl, Heliocorisa Lundbl., Sigara F., Subsigara Stich. and Parasigara Poiss. Then he proposed three more subgenera: Vermi- corixa, HaScorixa and Retrocorixa. This was apparently accept- able to Hutchinson, but such a sketchy, hastily-drawn proposal, unsupported by convincing evidence that Corixa Geoff roy and Sigara Fabr. are congeneric, and such "lumping," further weakened by the inconsistent "splitting" of Diaprepocorinae in the same pa- per seems to me ill-advised. Perhaps the uncertain future of the war years are responsible for Walton's brief note in Hutchinson's 1940 paper, and also for his "Natural Classification of the British Corixidae," 1943, in The Transactions of the Society for British Entomology (Vol. VIII, Pt. 5, pp. 155-168) in which he proposes to unite in the same genus such utterly different genera as Tricho- Western Hemisphere Corixidae 27 corixa and Graptocorixa and yet in the same paper separates the Diaprepocorinae into tribes! The entire paper is written with an air of authority and an assumption of knowledge that is not justi- fied. Mr. W. E. China, well-known hemipterist of the British Mu- seum, in "Some Remarks on Walton's 'Natural Classification of the British Corixidae' " in The Entomologist's Monthly Magazine, Vol. LXXIX, pp. 109-111, analyzes this paper and reduces Mr. Walton's new contributions or "innovations" to their proper place in order that the record may be correct and that Doctors Jaczewski, Lund- blad and Poisson may receive the credit due them. All of these men are sincere and able students of the Corixidae, with consider- ably more experience than had the author of "The Natural Classi- fication of the British Corixidae." I am sure that all of these men, as well as I, would have welcomed a really helpful contribution. Mr. China, whose taxonomic experience in Hemiptera is wide, was not writing as a student of the Corixidae, and therefore it is neces- sary for me to call attention to some statements and implications that need correction or question. Mr. Walton says in his opening paragraph: "Karyological in- vestigations have now been made in over a dozen species of Corix- idae. Cymatia has a diploid chromosome number of twenty-six, while all other studied species have twenty-four. I will endeavor to show that all of these latter species happen to belong to the same genus. (For chromosomes see: 1933 Prokofiewa, Zeitschr. f. Zellforsch und Mikroskop. Anat., 18: 1-27;* Poisson, 1936, Arch. Zool. Exp. et Gen., 78: 133-194, pi. 2-4; and Slack, Proc. Roy. Soc. Edinburgh, 58: 192-212.)" Prokofiewa, 1933, studied the chromo- some number and arrangement in the following eleven species of Corixidae: ''Corixa distincta Fieb., C. striata L., C. fossarum Leach, C. falleni Fieb., C. fabricii Fieb., C. semistriata Fieb., Calliconxa praeusta, Callicorixa wollastoni Dgl. Sc, Corixa sahlbergi Fieb., Corixa linnei Fieb. and Macrocorixa dentipes Thoms." He con- cluded from his studies that the first eight species comprised one group; C. sahlbergi Fieb. and C. linnei, a second gi'oup; and Macro- corixa dentipes, a third group. It is interesting to note that he had represented in his Group I: Sigara (Sigara) striata (L.) ; Sigara (Subsigara) fossarum (Leach), S. (S.) distincta (Fieb.), S. (S.) jalleni (Fieb.) ; Sigara {Retrocorixa) semistriata (Fieb.) ; Sigara (Vermicorixa) nigrolineata (Fieb.) (=r fabricii [Fieb.] ) ; also two species of Calliconxa. In his Group II were two species of Anti- * I find that this should be Vol. 19 instead of 18. 28 Thf: University Science Bulletin corixa Jacz. and in his Group III, Corixa dentines (Thorns.). His studies, so far as they go, would indicate that both Anticorixa and Corixa are distinct and that his first group is a mixed lot, rather more related to each other than to Anticorixa and Corixa. This evidence is against Mr. Walton's proposal rather than in support of it. Before making such sweeping generalizations as indicated by Mr. Walton, there should be a careful analysis of the material in the references cited and a background of familiarity at least wath Ge- netics and the Origin of Species by Dubzhansky, with The New Sys- tematics, by Huxley, and with Systematics and the Origin of Spe- cies, by Mayr. Doctor Slack, 1938, in his work, reported that he studied the fol- lowing nineteen species: "Corixa ptmctata Illiger, Corixa dentipes Thoms., Sigara linnaei Fieb., S. striata Fieb., S. distincta Fieb., S. falleni Fieb., S. castanea Thorns., S. semistriata Fieb., S. fabricii Fieb., *S. fossarmn Leach, S. scotti Fieb., S. carinata Sahib., S. ger- mari Fieb., Calliconxa praeusta Fieb., Ca. wollastoni D. & S., Ca. caledonica Kirk., Ca. concinna Fieb., Glaenocorisa cavifrons Thoms. and Cymatia bonsdorffi Sahib." Thus he examined the genera Co- rixa, Sigara, Callicorixa and Glaenocorisa, which have the diploid number of twenty-four chromosomes, and Cymatia bonsdorffi, which has twenty-six. Since Mr. Walton recognizes Glaenocorisa as a good genus, his statement above is not quite true. Surely the presence of the same number of chromosomes in two genera does not make it necessary to unite them. Doctor McClung and his stu- dents here at the University of Kansas many years ago found a number of genera of Orthoptera with the same number of chromo- somes. They are still good genera. On page 157 Mr. Walton says, "The Corixinae I have also di- vided into a predatory tribe, the Cymatiini, and a microphytic tribe, the Corixini, using the anterior tarsus combined with the mouth parts as the indicative characters, and this division is confirmed by studies of their feeding habits." A rather broad statement in view of the fact that the feeding habits of many species and even genera have not been observed. How predominately predatory the Cym- atiini are, I do not know. In the next paragraph, "There are only eighteen good genera in the whole family, and of these, seven are monospecific, while with the exception of four, none of the other genera contain more than ten species." What, according to Walton, are the eighteen good genera? He does not say. Western Hemisphere Corixidae 29 According to my figures there are forty-seven names that have been proposed for genera or subgenera of Corixidae. Of these, five are synonymous and of the remaining forty-two, twelve have never been used beyond subgeneric rank. This leaves thirty names that have been used as generic names but Mr. Walton assures us with confidence that there are "only eighteen good genera." What are they and what is his disposition of the remainder? He says seven are monospecific. A glance through our card catalogue shows that while many names were monospecific at time of proposal, only ten are still so. Of these ten we find he places Trichocorixella Jacz. un- der Trichocorixa Kirk., where it does not belong, and Neosigara Lundb. and Heliocorisa Lundb. under Corixa where, according to my judgment, they do not belong. This leaves seven monospecific genera but still leaves us wondering if Mr. Walton has overlooked the additions to former monospecific genera. If so, then we cannot positively identify his "good monospecific genera." It is clear that he accepts Micronecta Kirk, and Tenagobia Bergr., Trichocorixa Kirk, and Corixa Geof. He says the genus Trichocorixa Kirk, in- cludes "the genera Coi'isella Lundblad, Graptocorixa Hungerford, Trichocoi^ixella Jaczewski, Palmocorixa Abbott, Centrocorixa Lund- blad, Krizousacorixa Hungerford, Morphocorixa Jaczewski, and per- haps Ectemnostegella Lundblad." Morphocmixa, by the way, was not proposed as a genus. If Ectemnostegella Lundblad, then why not Ectemnostega Enderlein? If Graptocorixa Hungerford, then why not Neocorixo- Hungerford? I cannot accept any of this pro- posal. The genus Trichocorixa Kirkaldy, as Doctor Sailer treats it, is as neat and precise a generic group as can be found. The sinistral asymmetry of the males which is so stable that only four cases of reversal have been found in some 5,000 males, the common form of the male front leg in all species, the position of the nodal furrow in the females and other characters enable one to place these uni- formly small corixids in a distinct generic unit. By Mr. Walton's treatment of the Diaprepocorinae, Graptocorixa belongs to a differ- ent tribe, not to the same genus as Trichocorixa! All of the above- mentioned genera are so arranged in our keys that our position re- garding them is clear. To say that "all these groups are confined to central and southern America" is not true for Trichocorixa and Corisella reach well into Canada. Mr. Walton's attempt to separate his tribe Corixini into two groups is neither successful nor useful. When he proposes to place 30 The University Science Bulletin ''some 330 species" in these two groups which he calls the genera Trichocorixa and Corixa, which he cannot separate precisely, he has added confusion and stopped the student who has Corixidac to determine before he gets started! It does not seem to me that it takes thirty years of experience with Corixidae from all over the world to see the nonutility of such a proposal. It will be noted below that he disposes of nine generic names under his Trichocorixa, six under his Corixa and makes no disposi- tion of Ectemnostega, Pseudocorixa, Callicorixa, Arctocorisa, Hes- ■perocorixa, Anticorixa, Neocorixa and Tropocorixa. Thus he takes liberties with fifteen names and ignores eight others. His Group I, he says, contains forty species and must be called Trichocorixa and contains as subgenera: Corisella, Graptocorixa, Trichocorixella, Palmacorixa, Centrocorisa, Krizousacorixa, Mor- phocorixa' and perhaps Ectemnostegella. Here is his Trichocorixa described : I. "The hemielytral markings are generally curiously ragged, and there is ojten no line of demarcation between the corium and the membrane." II. "There is usually a narrow space between the eyes and the posterior mar- gin of the head and while the males are pleomorphic in their secondaiy sexual characters, they generally show the anterior tibia produced over the pala and the presence of hairs modified as pegs in the middle row of sifting hairs." How precise and accurate a picture does the above give of his Trichocorixa as a generic concept? Read again his "I" statement. The hemelytral markings are very distinct in Graptocorixa and some species have the membranal line distinct. All of the Corisella have the membranal line present. So do Krizousacorixa and Cen- trocorisa and it is visible in Morphocorixa. Five of the nine genera do not fit his statement "I." Now read again his "11" statement. He means that the postocular space is broader than it is in his Corixa. The postocular space is narrow in Centrocorisa, Corisella, and Morphocorixa, and in Trichocorixa and Palmacorixa no wider relatively than in Corixa and Sigara. Again five of the nine genera do not fit. Referring to the males he says: ". . . they generally show the anterior tibia produced over the pala and the presence of hairs modified as pegs in the middle row of sifting hairs." The anterior tibia of the males is not produced in Graptocorixa, Palma- corixa, Krizousacorixa, Morphocorixa and Ectemnostegella. Thus five of the nine genera do not fit. The following do not have pegs in the middle row of sifting hairs: Graptocorixa and Palmacorixa. In Corisella and Centrocorisa the peg rows are above the row of Western Hemisphere Corixidae 31 sifting hairs, while Neosigara, which Walton places under Corixa, does have pegs in the row of sifting hairs. In Krizousacorixa and Morphocorixa one species of each genus has pegs in the row of sifting hairs and the other does not. In Trichocorixa sens. str. there are no pegs in the row of sifting hairs. This statement, with its many contradictions, then has no significance. His Group II, which he proposes to call Corixa, "includes the gen- era at present known as Corixa and Sigara, Parasigara Poisson, 1935, Rhamphocorixa Abbott, 1912, Neosigara Lundblad, 1928, and perhaps the Southern Mediterranean species Heliocorisa Lundblad, 1928, vermiculata Puton, the only Old World species which ap- proaches Trichocorixa." This group contains, according to IVIr. Walton 330 minus 40 or 290 species. "The characters which sepa- rate this genus from the Trichocoinxa are as follows: Hemielytral markings definite even if vermiculate; always a line of demarcation between corium and membrane; space between eyes and posterior margin of head very narrow or absent; anterior tibiae never pro- duced over the tarsus ; never any hairs modified as pegs in the mid- dle row of sifting hairs." Let us examine the genera he assigns to Corixa in the light of his description. "Hemielytral markings defi- nite even if venniculate." Rajnphocorixa surely has most indefinite markings. See Plate V, figs. 17 and 18. "Always a line of demar- cation between corium and membrane." If this is true then Conxa sens. str. does not belong here. Neosigara has the line but faintly visible and would be doubtfully placed here. Heliocorixa does not have the membranal line present. Thus three of his six genera do not fit this statement. "Never any hairs modified as pegs in the middle row of sifting hairs." Then Neosigara does not belong here. In reviewing Mr. Walton's descriptions of his Trichocorixa and Coi'ixa, one wonders why he mentions the shape of the male tibia and the peg arrangement of the male pala when he had previously written: "From the start it was realized that those so very compli- cated sexual characters of the male which have been given such prominence by past workers must be largely disregarded . . . ." On page 158 under the subheading, "A Few Words on the Genera Corixa and Sigara," Mr. Walton devotes four and a half pages to this subject. In this he does not recognize Geoffroy's work of 1762 as valid, but apparently admits that Miiller, 1764, did validate Geof- froy's genera. He takes Mr. China to task for stating in his 1939 paper on this same subject that Corixa Geoff, and Sigara F. are not congeneric. Yet Mr. China was perfectly justified in his statement 32 The University Science Bulletin which was based upon the work of Jaezewski, Lundblad, Poisson, Stichel and Hedicke. It is also my position that Coriva and Sigara are not congeneric. Obviously, it is a question of the generic concept. A genus is usually- considered to be an assemblage of species agreeing in some one char- acter or series of characters and comprising closely related species. The criteria used in determining close phylogenetic relationships vary in different groups and their relative value in any one group may be subject to debate. In Corixidae we have the questions of the asymmetry of the males and the presence or absence of a strigil for example. Mr. Walton argues that the large, smooth species with sinistral asymmetry belonging to the genus Corixa Geoffroy are con- generic with the smaller, usually rastrate, species with dextral asym- metry that comprise the genus Sigara Fabr. He ridicules all of us who consider them generically distinct as "gullible followers" of Linnaeus, Geoffroy and Fabricius, and states: "Now in the light of modern knowledge Group B (Sigara) contains a number of species of Group A [Cwixa] , the only difference being the reversal of the segmental asymmetiy of the abdomen of the males. In Europe it so happens that these related species from the two groups are about equal in numbers (and appear to be the real reason for the long muddle). However, an intermediate si>ecies Corix-a mirandella Hutch, (a Glacial relict)* is found in Africa, and this, while being 8-8.5 mm. long, has faintly roughly sculptured pronotum and hem- ielytra and has left-sided asymmetry. In North America there are 14 species belonging to this group, but these are large and smooth with right-sided male abdominal asymmetry. Some of them like C. mirandella are slightly rough. One called C. laevigata Uhler occurs regularly with the asymmetiy directed to either side! Moreover such a reversal has been recorded in the Eurasian large smooth species; a male of C. affinis from Egypt was found by Jaczewski to have the abdominal asymmetry directed to the right (1924 Ann. Mus. Zool. Polon. Hist., Nat. 3: 83 f). There is another interesting North American species which, while being very large, has a rough sculpture and right-sided abdominal asym- metry. Structurally this so-called Hesperocorixa kennecottii Uhler (= C. brimleyi Kirk.) is a large example of the group of smaller species, nothing else. Moreover the diploid number of chromosomes is the same for all species of this group so far studied." * Hutchinson, 1930, used the term "Pluvial relict.' t This reference is incorrect. Western Hemisphere Corixidae 33 Mr. Walton's assertion that Corixa and Sigara are congeneric is based upon two or three observations made by others who were not convinced that the facts necessitated the union of the two genera. While Doctor Jaczewski (1924), who proposed the Anticorixa, stated that "the species belonging to it represent to a certain degree a mirror-inversion of those of the genus Corixa Geoffr./' he never- theless made it a subgenus of his Callicorixa {=Sigara sens. lat.). In 1928 I reported cases of reversed asymmetry in Arctocorixa edulis (Champ.) [= Corisella edulis (Champ.) ] and since then have pub- lished studies in other species. In describing Corixa williamsi, 1928 [a synonym of Sigara grifflni (Kirk.)], I had two males that were sinistral and one that was dextral. In 1939 I studied a long series of this species and found six dextral males in 751 males. In Tricho- corixella, which Jaczewski described as sinistral, I found (1942) that of sixty males, twenty-four were sinistral and thirty-six dex- tral. Jaczewski, 1931, reported five cases of reversal in twenty-six males of Krizousacorixa femorata (Guerin). In our own collection of this species we have 262 males of which 79 are sinistral and 183 dextral. Poisson, 1935, reported three males of Corixa affinis and seven males of Sigara sahlbergi with reversed asymmetry. Jaczew- ski, 1936, reported a reversed male, Corixa affinis from Africa. In our own collection we have a male of Corixa punctata 111. from Wmldn., England, that is dextral. The other males from the same place are sinistral. With the hundreds of European Corixidae ex- amined, the sinistral male pattern must be well established in Cor- ixa and the dextral male pattern quite stable in Sigara. In such groups I think the character has generic significance and is useful. In Krizousacorixa and Trichocorixella, cases of reversal are frequent but other characters define these genera. In Pseudocorixa we have one species that is sinistral and several that are dextral. Thus I consider that the direction of the asymmetry in male Corixidae may have generic significance or it may not. In the Gastropods also the asymmetry of the shell may be a family character or it may not be even a specific character. * Even in species belonging to families that are dextral you now and then find a sinistral specimen. I men- tion the Gastropods because Walton states, "It is only too obvious that this occurrence of reversal of asymmetry is largely a matter of chance, and has much the same significance as the reversed spiral found in the Gastropoda, and Dextrocordia in the Mam- J Limnaea peregra for example. 3—822 34 The University Science Bulletin malia . . ." The direction of the spiral in the shell of tiie Gas- tropod is determined by the structure of the animal itself and its significance varies as stated by me above. As for "Dextrocordia" in mammals there is indeed no more significance in it than in the occasional dextral Corixa or sinistral Sigara. Walton states that in Europe the two groups are about equal in number. If he is comparing Corixa with its sinistral males and Sigara with its dextral males, the statement is not true.jj I know of but eight or nine species of Corixa sens. str. and its known dis- tribution is from the British Isles across Europe and North Africa to India, a spread but little greater than that of Corixa punctata Illig., the type species of the genus. Sigara, on the other hand, is represented by one or more groups on all the continents. It is this Sigara comjilex that is made up of some groups that are quite well defined and have been given names such as Callicorixa B. White sens, str., Arctocoiisa Wallengren sens, str., both of which are Hol- arctic and Alpine in distribution; Anticorixa Jaczewski, which is equal to Hesperocorixa Kirkaldy, is Holarctic, and Morphocorixa Jaczewski, which includes two species from southwestern North America. In the above four groups the females as well as the males can be unerringly placed. Then we have some named groups the males of which fit a common pattern but their females have so far defied a group description such as Sigara Sigara- Fabr., Sigara Sub- sigara Stichel, Sigara Vermicorixa Walton, Sigara Retrocorixa Wal- ton, Sigara Halicorixa Walton, Sigara Parasigara Poisson, and Sig- ara Tropocorixa Hutchinson. S. Subsigara, named for the fossarum group of Europe, has one species in the United States. S. Tropo- corixa, which Hutchinson named for *S. promontoria (Dist.), occurs in New Zealand, Australia, Tasmania, India, Madagascar, Africa and South America. While there are only three corixids recorded for New Zealand, one is S. (Tropocorixa) arguta (White), and in the other regions mentioned above there is an increasing proportion of the species of the Sigara complex that belong to the Tropocorixa. In addition to the named groups, some of which are ill-defined, there are other unnamed assemblages of species and many individual species that differ from each other more than some of the named groups do. Mr. Walton's statement that the American species "C. laevigata Uhler occurs regularly with the asymmetry directed to either side" is a surprise to me. We have 600 males of this species from many H I think, however, that he was comparing Corixa and Anticorixa and it would have been clearer to have so stated. Western Hemisphere Corixidae 35 places and only two sinistral specimens! His statement that there are fourteen species of North American Corixidae that are large and smooth with right-sided male abdomens is not quite true. There is only one that is quite smooth and that is C. laevigata Uhler, but even this shows some rastrations, and the females of this species are easily separated from the females of European Corixa. Doctor Jaczewski has pointed out that Corixa sens. str. has a single row of short spines on the dorsal surface of the hind femur. In Anticorixa, if spines occur on the dorsal surface of the hind femur they are not so arranged. Miss Addic Egbert, in an unpublished Master's thesis here at the University of Kansas, has made a care- ful study of Corixa and Hesperocorixa, and has found that the media vein in the hemelytra of Corixa species nearly always ends or fades out before it reaches the nodal furrow, while in Hespero- corixa {= Anticorixa) it nearly always unites with the nodal fur- row. All of the males of Corixa sens. str. have the penial sheath curiously modified which is not true for the males of H. laevigata (Uhl.) or any other Hesperocorixa studied. I may add, since Mr. Walton mentions the species, that we have studied a series of Corixa mirandella Hutchinson from the type locality and that definitely the species belongs to Corixa. The argument that "broad-minded entomologists when writing on Corixidae have often used the generic name Corixa to cover all British species not belonging to Cymatia, Glaenocorixa or Micro- necta in order not to commit themselves over this confusing is- sue . . ." has no more weight than to say that Fieber called everything Corixa, except the Micronecta, including Cymatia, Glaenocorisa and Agraptocorixa which even Mr. Walton can recog- nize as good genera. As in most other families, many of the generic names were first proposed as subgenera and later accepted as gen- era, such as Agraptocorixa Kirk., Cymatia Flor and Glaenocorisa Thoms. which were proposed as subgenera of Corixa. If there were uniformity of criteria for genera in Insecta, we would have a guide. However, there is none and generic values vary from family to family. The use of subgeneric names is frowned upon by many taxono- mists, yet I must confess that Tropocorixa Hutchinson, which stands as a subgenus of Sigara because I cannot, at present, positively define the females, is a useful name. As Mayr, 1942, has stated, "The genus is based on the fact that the species are not evenly dis- 36 The University Science Bulletin tinct from one another, but are arranged in smaller or larger groups, separated by smaller or larger gaps. The genus is therefore based on a natural phenomenon. How many of such groups are to be included in one genus and how the genus should be delimited from other genera are matters of convenience, to be left to the judgment of the individual systematist. The genus of the systematist is his own artificial creation and not a natural unit." The arrangement of what appear to be closely related species into groups is a matter of great convenience. Such groups, when possible, should not be large and unwieldy, necessitating further group names. In the Corixidae, if such a phylogenetic group of species has in common a general facies and structural characters that enable one to assign both males and females to the group we are giving it generic rank. In some cases the pattern of geograph- ical distribution may be an additional factor in reaching such a conclusion. If it is not possible to do this, we are leaving it as a subgenus, if already named, within the genus to which it appears related. In most genera the species are much alike but in Sigara Fabr. we have a wide assortment of species that are obviously not as closely related as they should be to belong to the same genus; yet we are leaving them there until usable group characters are found that would give them recognizable generic rank. I would have been quite content to have referred to these assemblages as the falleni group, the alternata group, etc. However, since the falleni group is the subgenus Subsigar^a, and the alternata group falls within the subgenus Vermicorixa, and most of our South American species belong to the subgenus Tropocorixa, it has seemed necessary for the sake of consistency either to ignore the subgeneric names already proposed or to give subgeneric names to the remaining groups and to species that stand quite alone. The latter plan has been fol- lowed in this paper. Identification of Corixidae A. Technique Most of the characters that are of taxonomic value have been mentioned in the history of the taxonomy of this family. The males possess adequate structural specific characters but the females, ex- cept in a few genera, do not. The females can, however, usually be placed by their resemblance to the males in color, pattern, sculptur- ing or structural details. In a mixed lot from a given locality it will save time to sort out and determine the males first and then associ- Western Hemisphere Corixidae 37 ate the females with tlie males. The more experience one has with the Corixidae the easier this becomes. Until one becomes thor- ouglJy familiar with the species, it is necessary to examine the male genital capsule and compare it with the drawing of the species you have determined it to be. This is not as difficult as one might think. The pinned specimen can be relaxed by a drop of relaxing fluid,* or five per cent alcohol and in a minute or two it is ready for examina- tion. By holding the specimen with one hand under the binocular and using a small curve-pointed dissecting needle with the other hand, one can reach in between the lateral lobes of the eighth ab- dominal segment and gently withdraw the genital capsule entire without, in the slightest, disturbing the external appearance of the insect. The capsule does not have to be cleared and can be exam- ined in alcohol or a drop of glycerin and remounted on a card be- neath the insect or placed in a tiny vial with a little glycerin and pinned through its cork beneath the specimen. In routine deter- minations we usually simply relax the specimen and draw out the capsule far enough to examine the clasper without severing its con- nection. While the specimen is relaxed the abdomen can be bent down and the strigil and dorsal surface examined. In mounting Corixidae care should be taken not to pin through the metaxyphus. The precaution also should be taken in mounting small specimens on paper points not to cover the metaxyphus. The terminology used in this paper is intended to be non-technical with a sufficient number of drawings to identify structural parts. An excellent paper on corixid anatomy is Doctor Melvin E. Griffith's "The Environment, Life History and Structure of the W^ater Boat- man, Ratnphocorixa acuminata (Uhler)" in the University of Kan- sas Science Bulletin, Volume XXX, Part II, No. 14, pp. 241-365, 1945. The instructions below should be followed in making the measure- ments used in the descriptions and keys: 1. The interocular space (or synthlipsis). To arrive at a con- clusion as to whether or not the interocular space is narrower than, equal to, or broader than the width (posterior) of an eye, we have used a squared eye-piece micrometer. First, set the bug so that the head is as level as possible as seen from above. Do not move the specimen after it is in position. Next, measure each eye separately by means of the squares (see text figure below), and then compare these widths to the width of the interocular space. In the figure be- * Alcohol (75%), 106 cc. ; Dist. water, 98 cc. ; Benzol, 14 cc. ; Ethylucctate, 38 cc. 38 The University Science Bulletin low the interocular space is broader than the eye since it measures one and one-half squares (No. 3), while the eyes (1 and 2) measure about one and one-fifth squares. Measuring ihe Interocular Space Fig. 2. (I) Measure the posterior width of left eye as seen from above. (2) Measure the posterior width of the right eye. (3) Measure the space between the eyes at the inner angles. 2. The pruinose areas, a. The claval pruinose area is measured from the basal shining angle of the clavus to the distal end of the pruinose area. 6. Unless otherwise stated, the post-nodal pruinose area is measured by its greatest length, from its juncture with the cubital ridge to its apex. 3. The meron. At the base of the meron, where it (apparently) joins with the metaepisternum, there is a small groove or suture in the latter sclerite. The meron is measured from this groove to its distal end. 4. The metaxyphus is a triangular extension of the metasternum (see Plate III), and is measured from the point where the meta- sternum joins with the inner extension of the metaepisternum. 5. The legs. Measure the greatest possible length of each seg- ment unless otherwise stated. B. Glossary of terms in this paper The following terms are defined or illustrations cited for the bene- fit of the casual student: Acuminate — Tapering to a long point. Allotype— A chosen type of the sex other than that of the holotype of a spe- cies. Western Hemisphere Corixidae 39 Anal lobes — The lateral lobes of the eighth abdominal segment (.see Plate III). Appressed — Pressed, or flattened, against; closely applied to. Carina — Ridge or raised area ; also, a keel. Caudad — Toward the rear. Cephalad — Toward the head. Constricted — With the sides approaching each other for a part of the distance. Claspers of male Corixidae — Two unlike appendages attached to the genital capsule or ninth segment. In dextral males, the right one is free while the left one partially clasps the posterior sternal process and assists in guiding the phallic shaft. In sinistral males the opposite is true. Also called har- pagones, parameres, gonopophyses, and styles. Claval suture — Between the clavus and corium, along the vannal vein (see Plate III). Clavus — The vannal portion of the hemelytron (see Plate III). Corium — That portion of the hemelytron between the clavus and embolium, distally limited by the membrane (see Plate III). Costal margin of a hemelytron — The outer margin of the forewing at rest. Co-type — Any of the series mentioned in an original description in which the author did not designate a holotype. Dextral — To the right of the median line; used for male Corixidae having the abdominal asymmetry, as viewed from above, on the right .side, with the genital capsule directed toward the right, and with the .strigil, when pres- ent, on the right side. Embolar groove — The deep submarginal gutter on the embolium which may be extended beyond the nodal furrow. Its surface is pruinose. Falcate — Sickle-shaped; convexly curved. Fovea — see "frontal fovea." Frons or front — That portion of the face or front of the insect head lying be- tween the rostrum or beak and the vertex (.see Plate III). Frontal fovea — A depression on the frons of the male. Genital capsule of male — The ninth abdominal segment which, in Corixidae, is invaginated (see Plate III). Genotype — The species selected as representative of a genus. Haplotype — A type by single reference. Hemelytron — The front wing. (Plural, hemelytra.) Holotype — The specimen, usually male, set up by the author of a new species as the representative of that species. Hypo-ocular suture — Usually visible on the infraocular portion of the face of a corixid (see Plate III). Infraocular portion of genae — That portion of the face of a corixid lying be- low the compound eye (see Plate III). Infuscate (-ed) — Smoky gray-brown, with a blackish tinge. Inosculate — Enmeshed, undulate lines. Interocular space — The distance between the inner posterior angle of the eyes as seen from above. See also "Synthlipsis." Keel — Ridge or raised area; ahso, a carina. Laterad — Toward the side. Lateral bend of mesoepimeron — (See Plate III). Lateral flange of the sternellum — A sclerite extending laterad from the meta- sternum along the disto-lateral margin of the mesoepimeron and ending at 40 The University Science Bulletin the scent gland osteole. According to Snodgrass, it protects a groove through which the scent travels from the gland to the osteole and may even be a part of said groove. Lateral lobe of prothorax — See "Prothoracic lateral lobe.' Lectotype — A holotype selected from the co-type series to represent the spe- cies. Logotype — A type (of a genus) by subsequent designation. Median — Center, middle. Membrane — The distal, apical portion of the hemelytron (see Plate III). Meron — A continuation of the metathoracic epimeron which in nymphs helps to shelter the spiracle of the first abdominal segment, and which in adults serves as a supporting pleurostemite of the first abdominal segment, articu- lating firmly with the tergal margin of the second. (After Griffith.) (See Plate III.) Mesoepimeron — The epimeron of the mesothorax (see Plate III). Metacoxal piece — See '"Lateral flange of sternellum." Metaepisternum — See "Metathoracic epi.sternum." Metasternal xyphus — The triangular plate \ymg between the hind coxae. It is a proce.ss of the metasternum. Metathoracic episternum or metaepisternum — The sternal plate of the meta- thorax (see Plate III). Metaxyphus — See "Metasternal xyphus." Neotype — A holotype by subsequent designation and not from the original type series. Nodal furrow — "A membranous joint in a softened (boiled) hemelytron of a corixid. In the Miridae, a similar joint is the boundary between the em- bolium and the cuneus. If homologous in the two families, it (the nodal furrow) marks the distal end of the embolium in Corixidae." (Snodgrass m litt.) (See Plate III.) Orifice of the scent gland — See "Osteole of the scent gland." Orthotype — A type (of a genus) by original designation. Osteole of the scent gland — Orifice of the scent gland, guarded by hairs, and located at the end of the lateral flange of the sternellum on the caudal (or caudo-lateral) margin of the mesoepimeron (see Plate III). Pala — The tarsal segment of the front leg of Corixidae (see Plate III.) Palm — That portion of the pala, usually pilose, lying between the upper and lower row of palmar hairs (see Plate III). Palmar hairs — Usually a row of long hairs on the lower margin of the pala, and a row of short hairs along the upper margin of the palm (see Plate III). Paratype — A specimen or specimens described at the same time that the holo- type is described. Pebbled — A rough and irregularly indented surface. Penial flaps — Two sclerotized flaps or plates at the distal end of the cctotheca or penial sheathe. Penial sheathe — The ectotheca. This structure occurs on the male genital capsule and serves to protect and direct the aedeagus. It terminates dis- tally in two sclerotized f]aps (see Plate III). Pilose — Covered with short hairs. Postcoxal piece — See "Lateral flange of sternollum." Western Hemisphere Corixidae 41 Postocular space — Dorsal surface of the head behind the eye. Prestrigil — Stout setae, anterior to the strigil, on the posterior margin of the fifth tergal abdominal lobe of the male corixid (see Plate III). Prestrigilar hairs or bristles— See "Prestrigil." Pronotal disk — The pigmented or patterned portion of the pronotum (see Plate III). Prothoracic lateral lobe — See Plate III. Protuberance — Any elevation above the surface. Pruinose — Having a frosted appearance. Pubescent — Covered with short hairs. Rastrate — Covered with nearly parallel, longitudinal scratches. Reticulate— Covered with a network of lines (see wash drawing of Corixa, Plate IV, fig. 4). Right clasper of male— See "Claspers of male Corixidae." (Also Plate III.) Rugulose — Minutely wrinkled; roughened, but not rastrate. Scent gland osteole — See "Osteole of the scent gland." Serrate — Saw-like. Sieve hairs — See "Palmar hairs." Sinistral— To the left of the median line ; used for male Corixidae having the abdominal asymmetry, as viewed from above, on the left side, with the genital capsule directed toward the left, and the strigil, when present, on the left side. Sternellum — See meso- and metasternuni. Stramineous — Pale yellow, straw color. Stridular area of femur — An area covered by rows of short pegs on the basal inner surface of the front femora of some males (see Plate III). Strigil — A structure, usually made up of rows of comb-like teeth, on the sixth dorsal abdominal segment of the male corixid. Its function, according to Larson, 1938, is to grip against the female venter in copulation. Synthlipsis — The basal constriction of the vertex of the head; the nearest ap- proach of the eyes to each other as seen from above. Also referred to as "the interocular space." Tip of the ninth segment — Posterior sternal process of the ninth sternellum. Undulate — Obtuse waves in segments of circles. Vein Cu — Cubitus (see Plate III). Also Griffith's paper cited above. Vein M — Media (see Plate III). Also Griffith's paper cited above. Vermiculate — With tortuous markings resembling the tracks of a worm. Vertex — The front margin of the head as seen from above. Corixidae Family characteristics: Medium sized to small bugs somewhat flattened dorso-ventrally, the head broad, triangular in front view, concave posteriorly and overlapping the anterior margin of the pro- thorax. The rostrum or beak short, subconate, apparently unseg- mented and firmly attached as part of the head. The absence of a recognizable segmented beak distinguishes the Corixidae from all other Hemiptera. Eyes large, triangular in outline. Ocelli absent 42 The University Science Bulletin PLATE III a. p*g row b. upptr palmar bristftt c. clow head Foraltg el S d. dortol carina ». lowar palmar brittlat f. ipinitorm hair bundl* fortwing clavus cofium I cubifus ; g. pad h. ilriiular mtmbrani ..aadaoQus .Jaft claspar ■panial ihtatht ■Up at 9th t«gflt«n> 1^.. right clotpar GENITAL CAPSULE HESPEROCORIXA OBLIQUA (HUNGFD) Western Hemisphere Corixidae 43 except in the Diaprepocorinae; antennae short, 3 or 4 segmented, in- serted beneath the eyes and hidden between the head and prothorax. Scutellum may be exposed or hidden by the pronotum. The hemel- ytra parchment-hke with clavus, corium, embohum, and membrane, the last without veins and of the same texture as the corium. Each pair of legs modified for a different function. Anterior legs short with the terminal segment (the pala) variable in form, but often more or less spoon-shaped and fringed with strong bristles for gath- ering food.* Middle legs for anchorage and support, elongate and slender, the single segmented tarsusf ending in two long claws. The posterior legs fairly stout with cardinate coxae, stout femora, short tibiae, and two-segmented tarsi that are flattened and fringed for swimming. The abdominal segments of the male more or less asym- metrical. The nymphs with dorsal abdominal scent glands, and adults with thoracic scent glands opening laterad of the mesocoxae. Kkv to Sukfamilies ok Corixidae A. Scutellum exposed, covered by pronotum only at anterior margin. B. Two ocelli present; antennae 4 -segmented; fore tarsal claw large. Diaprepocorinae Lundb. 1928 (Australasia) BB. Ocelli absent; antennae 3-segmented; fore tarsal claw of 5 spinelike; tarsal claw of male capable of being folded back into an excavation on the outside of the tarsus ; of various shapes, usually large and often fleshy. Micronectinae Jacz. 1924 (Tropical world) (See p. 54) AA. Scutellum covered by pronotum (rarely with apex visible). B. Hemelytra without embolar groove Stenocorixinae subf. n. (African) (See p. 99) BB. Hemelytra with embolar groove. C. Rostrum with transverse sulcations absent ; nodal furrow absent, vein M of hemelytron appearing to curve abruptly downward to costal margin. Cyinatiinae subf. n. (Holarctic) (See p. 99) CC. Rostrum with transverse sulcations; nodal furrow complete; vein M usu- ally curving upward to fuse with Cu at or just before the origin of the nodal furrow. D. With the infraocular portion of genae very broad, the lower margin of eye concave, the hypo -ocular suture arising near the subacute production of the inferior angle of the eye; vein M indistinct, placed parallel and very near to vein C\x. . .Heterocorixinae subf. n. (South American) (See p. 105) DD. With the infraocular portion of the genae not broad, or if broad, the hypo -ocular suture when present arising about midway along ventral marpin of eye; vein M present through most of the length, usually midway between costal margin and vein Cu and usually fused at apex with Cu Corixinae Enderlein 1912 (World wide) (See p. 137) * In a few species the pala is fused with the tibia. t In Diaprepocorinae middle tarsus is two-segmented. 44 The University Science Bulletin WASH DRAWINGS OF THE GENERIC AND SUBGENERIC GROUPS OF THE CORIXIDAE OF THE WORLD Drawn by Kathleen Doering and Addie Egbert PLATE IV Fig. 1. Sigara {Tropocorixa) choprai Hutchinson; male. Subgenus Tropocorixa Hutchinson, 1940. Fig. 2. Stenocorixa protrusa Horvath; female. Genus Stenocorixa Horvath, 1926. Fig. 3. Ectemnostegella stridulata n. sp.; male. Genus Ectemnostegella Lundblad, 1928. Fig. 4. Corixa punctata Illiger; female. Genus Corixa Geoffroy, 1762. Fig. 5. Heliocorisa vermiculata (Puton) ; male. Genus Heliocorisa Lundblad, 1928. Fig. 6. Ectemnostega quadrata (Signoret) ; female. Genus Ectemnostega Enderlein, 1912. Fig. 7. Corixanecta personata (Hale) ; male. Genus Corixanecta Walton, 1940. Fig. 8. Morphocorixa coiyipacta (Hungerford) ; male. Genus Morphocorixa Jaczewski, 1931.* Fig. 9. Pseudocorixa guatemalensis (Champion); male. Genus Pseudoconxa Jaczewski, 1931. Fig. 10. Corisella decolor (Uhler) i^ dispcrsa (Uhler) ; male. Genus Corisella Lundblad, 1928. Fig. 11. Diaprepocoris barycephala Kirkaldy; female. Genus Diaprepocoris Kirkaldy, 1897. Fig. 12. Agraptocorixa eurynome (Kirkaldy) ; female. Genus Agraptocorixa Kirkaldy, 1898. Fig. 13. Centrocorisa nigripennis (Fabricius) ; male. Genus Centrocorisa Lundblad, 1928. Fig. 14. Signra (Pediosigara) hydatotrephcs (Kirkaldy) ; male. Subgenus Pediosigara new. * Jaczewski placed Morp/iocorixa as a subgenus of Sigara, but we believe it to be a good genus. Western Hemisphere Corixidae 45 PLATE IV / Tropocorixo Hoick 7 Conxonecia Walton H 3 Eclomnostegelh Lundbl 2 Stenocorita Horv A. Corixa Geoffr. 6. Eclomnosteoo Endl. 8 Morphocomo Jocz 9 Pseudocorita Jocz IP 10 Consella Lundb /I. Oioprepocoris Kirfi . 12 Agraptoconxa Kirk. , 13. Ceniroconsa Lundbl. W hydoforrep/ies Kir 46 Tin-: Uxivlrsity Science Bulletin WASH DRAWINGS OF THE GENERIC AND SUBGENERIC GROUPS OF THE CORIXIDAE OF THE WORLD Drawn by Kathleen Doering and Addie Egbert PLATE V Fig. 15. Micronecta minutissima (Linne) ; female. Genus Micronecta Kirkaldy, 1897. Fig. 16. Tcnagobia socialis (B. White) ; female. Genus Tenagobia Bergroth, 1899. Fig. 17. Ramphocorixa acuminata (Uhler) (^= balanodis Abbott) ; femalo. Genus Ramphocorixa Abbott, 1912. Fig. 18. Ramphocorixa acuminata (Uhler) ; male. Fig. 19. Trichocorixa verticalis (Fieber) ; male. Genus Trichocorixa Kirkaldy, 1908. Fig. 20. Heterocorixa sp.; female. Genus Heterocorixa B. White, 1879. Fig. 21. Cymatia americana Hussey; female. Genus Cymatia Flor, 1860. Fig. 22. Sigara (Vermicorixa) scabra (Abbott) ; male. Subgenus Verm,icorixa Walton, 1940. Fig. 23. Trichocorixa verticalis (Fieber) ; female. (Arrow indicates position of nodal furrow.) Fig. 24. Palmacorixa gillettei Abbott; male (after Abbott). Genus Palmacorixa Abbott, 1912. Fig. 25. Trichocorixella ynexicana (Hungeviord) (= tf;o^s/cJ Jaczewksi) ; male. Genvis Trichocorixella Jaczewski, 1931. Fig. 26. Sigara (Lasiosigara) lineata (Forster) ; male. Subgenus Lasiosigara new. Fig. 27. Sigara (Lasiosigara) trilineata (Pro\'ancher) ; male. Western Hemisphere Corixidae PLATE V 47 15. Micronecta Kirk. 16 Tenagobia Berg ^jggrq 17 fiomphocorixa s Abbt. le. Romphocorixa (S (9 Trichocorixa Kirk. 6 ZO. Heteroconxa White 21. Cymatia Flor I 23. Trich ocorixa g 22. scabro Abbt. 26. lineoto Forsf. 24. Palmocorixa Abbt 25 Trichocorixella Jacz. 27. tniineota Prov. 48 The University Science Bulletin WASH DRAWINGS OF THE GENERIC AND SUBGENERIC GROUPS OF THE CORIXIDAE OF THE WORLD Drawn by Kathleen Doering and Addie Egbert PLATE VI Fig. 28. Callicorixa praeusta (Fieber) ; male. Genus Calliconxa B. White, 1873. Fig. 29. Krizousacorixa femorata (Guerin) ; female. Genus Krizousacorixa Hunger ford, 1930. Fig. 30. Kiizousacorixa femorata (Guerin) ; male. Fig. 31. Sigara iPhaeosigara) signata (Fieber) {—seriala (Abbott); male. Subgenus Phaeosigara new. Fig. 32. Sigara (Pileosigara) douglasensis (Hungerford) ; male. Subgenus Pileosigara new. (In this drawing the eyes should be parallel along the inner margins.) Fig. 33. Neosigara gnffini (Kirkaldy) {— williamsi (Hungerford); male. Genus Neosigara Lundblad, 1928. Fig. 34. Neosigara columbiensis Lundblad; male. Fig. 35. Glaenocorisa cavijrons Thomson; female. [Now G. propinquc (Fieber). J Glaenocorisa Thomson, 1869. Fig. 36. Sigara (Phaeosigara) variabilis (Hungerford) ; male. Fig. 37. Neocorixa snowi Hungerford; female. Genus Neocorixa Hungerford, 1925. Fig. 38. Grapiocorixa abdominalis (Say) ; male. Genus Grapiocorixa Hungeiford, 1930. Western Hemisphere Corixidae PLATE VI 49 29 Krizousacorixa Hungfd g 28. Calliconxa White 3/. signata f"/eb) gr 33- griffint Kirk. 32. douglasensis Hungfd. 34 Neosigora Lundbl. I 36 variabiiis Hungfd. 35. Glaenocorisa Thorns. 37 NeocorUo' Hungfd -38 Graptocorixa Hungfd. 4—822 50 The University Science Bulletin WASH DRAWINGS OF THE GENERIC AND SUBGENERIC GROUPS OF THE CORIXIDAE OF THE WORLD Drawn by Kathleen Doering and Addie Egbert PLATE VII Fig. 39. Ccnocorixa wileyce (Hiingerford) ; male. Genus Cenocorixa new. , Fig. 40. Sigara (Aphclosigara) jarmanae Hiingerford; male. Subgenus Aphelosigara new. Fig. 41. Sigara {V ermicorixa) omani (Hungerford) ; male. Fig. 42. Sigara (Arctosigara) bicoloripennis (Walley) ; male. Subgenus Arctosigara new. Fig. 43. Dasycorixa hybrida (Hungerford) ; male. Genus Dasyconxa new. Fig. 44. Sigara (Subsigara) jalleni (Fieber); male. Subgenus Subsigara Stichel, 1935. Fig. 45. Hesperocorixa sahlbergi (Fieber) ; male. Genus Hesperocorixa Kirkaldy, 1908. (Including Anlicorixu Jaczewski 1924.) Fig. 46. Hesperocorixa brimleyi (Kirkaldy)*; female. Fig. 47. Sigara (Allosigara) decorala (Abbott) ; male. Subgenus Allosigara new. Fici. 48. Sigara (Xenosigara) ornata (Abbott) ; male. Subgenus Xenosigara new. Fig. 49. Sigara (Sigara) striata (Linne) ; male. Genus Sigara Fabricius, 1775. Fig. 50. Arctocorisa carinata (Sahlberg) ; male. Genus Arctocorisa Wallengren, 1894. * Kirkaldy established Hesperocorixa as a subgenus with brimleyi as the subgenotype. Western Hemisphere Corixidae 51 PLATE VII 39 wileyi Hungfd gr 41 omani Hungfd gr. 40 jormonoe Hungfd. 42 bicoloripennis Walley 46. Hesperocorixa Kirk. 4 5 Anticonxa Jocz. 44 Subsigara Walton 43 hybrida Hungfd- gr 47. decor ata Abbf. 48 ornafo Abbt 49 Sigara Fobr 50 Arclocorisa Wallen 52 The University Science Bulletin WASH DRAWINGS OF THE GENERIC AND SUBGENERIC GROUPS OF THE CORIXIDAE OF THE WORLD Drawn by Addie Egbert PLATE VIII Fig. 51. Sigara {V ermicorixa) nigrolineata (Fieber) ; male. Subgenus Vermicorixa Walton, 1940. Fig. 52. Sigara (Haliconxa) selecta (Fieber) ; male. Subgenus Haliconxa Walton, 1940. Fig. 53. Xenocoiixa vittipenjiis (Horvath) ; male. Genus Xenocorixa Hungerford, 1947. Fig. 54. Pseudoglaenocorisa hugoscotti (Hutchinson); male. Genus Pseudoglaenocorisa Jaczewski, 1939. Western Hemisphere Corixidae 53 PLATE VIII 51. Vermicorixa Walton 52. Halicorixa Walton 53 XenocoriHO Hungfd. 54. Pseudoglaenocorisa Jacz. 54 The University Science Bulletin MicRONECTiNAE Jaczewskl Small corixids with exposed scutellum. The rostrum with trans- verse sulcations. Ocelli absent. Hypo-ocular suture in a lateral position. Antennae three-segmented. Pala with well developed palm. Hemelytra with shallow embolar groove. Nodal furrow may be well developed or absent. This subfamily is represented in the Americas by the genus Tena- gobia Bergroth. The Genus Tenagobia Bergroth 1899. Bergroth, E. Ent. Mo. Mag., ser. 2, X (35), p. 282. 1901. Champion, G. C. Biol. Centr. Amer. Heteroptera II, p. 383. 1906. Kirkaldy, G. W. Trans. Amer. Ent. Soc. XXXII, p. 152. 1909. Kirkaldy, G. W. and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X. p. 193. 1917. Van Duzee, E. P. Catalogue of the Hemiptera .... p. 477. 1928. Lundblad, O. Arkiv. f. Zool. XX, A (7), pp. 1-28. 1928. Jaczewski, T. Annales Mus. Zool. Polonici, VII, pp. 51-52, PI. II. 1930. Deay, Howard. Bull. Brooklyn Ent. Soc, XXV, No. 3, p. 171. 1935. Deay, Howard. Univ. of Kan. Sci. Bull. XXII, No. 14, pp. 403-477. 1935. Poisson, R. Archiv. de Zool. Exp. et Gen., LXXVII, p. 45C. 1943. Walton, G. A. Trans. Soc. Brit. Ent. VIII, p. 157. Since Howard O. Deay (1935) published a revision of this genus in the University of Kansas Science Bulletin XXII, No. 14, pp. 403- 477, students interested in Tenagobia should refer to Doctor Deay's paper. For the sake of completeness and the convenience of the general student the key, descriptions and plates are reproduced from his work: "Corixids with three-segmented antennae; ocelli absent; pro- notum convex in front and concavely arcuate behind, covering but anterior part of scutellum which is large; so-called tympanal organ in metathorax present; strigil absent; abdomen in males with right- sided asymmetry; fore tibia and tarsus in females fused into a tibiatarsus; fore tarsus in males one-segmented, without stridula- tory pegs, and excavated on outer surface to receive the large, fleshy, movable tarsal claw; a single, apical hind tarsal claw. "This genus is very close to Micronecta Kirkaldy from which it is distinguished by the crescent-shaped pronotum and absence of a strigil in the males." To Doctor Deay's description we may add that they do not have a nodal furrow in the hemelytron. This New World genus of very small corixids is confined to the Neotropical and southern extremity of the Nearctic regions. It extends from southern California to Buenos Aires, Argentina. One species only {T. mexicana Deay) Western Hemisphere Corixidae 55 occurs in North America, and we have seen no examples north of Mexico. Two species are recorded from Central America {T. mexi- cana Deay and T. costaricana Jaczewski) ; the other fourteen spe- cies are South American. We know nothing about the egg-laying or feeding habits of the Tenagobia. The reader will please be mindful that all that follows concerning Tenagobia Bergroth is Doctor Howard 0. Deay's work and is in his own words. GROUPS WITHIN THE GENUS On the basis of their structural characteristics the genus can be divided into two major and five minor groups. The presence or absence of a group of mustache-like bristles on the lateral margins of the epimera of the prothorax (PI. X, figs. 15, 17) divides the spe- cies of the genus into two major groups. Group I, those possessing mustache-like bristles, is composed of the following species: constricta, fuscata, hunger jordi, nielini, ro- mani, and schadei. The species within Group I form two distinct groups which the writer wishes to designate as the "constricta group" and the "hungerfordi group." The constricta group, com- posed of constricta and romani, is a very distinct one and possesses the following characters: an eye at least one-fourth times wider than the interocular space, long, slender forelegs which have but two spine-like setae on each femur, and claspers (PI. XI, figs 4, 7) which are very different in shape from that of the other known species. The hungerfordi group, comjwsed of fuscata, hungerfordi, nielini, and schadei, is not as sharply defined as the constricta group, but the si>ecies composing it have the following characters in com- mon: each fore femur bears five or more spine-like setae {select a is the only other species having this many) ; the left clasper of each (PI. XI, figs. 2, 3, 8, 13) has a brown, stiff projection on the inner side near the base ; the right side of the sixth abdominal tergum has a deep cleft which bears a row of simple setae (also present in selecta) ; and the size and shape of the four species are similar. Of the species in this group, schadei is unique in that it is the only species of Tenagobia known which has no minute peg-like setae on the hemelytra. In all other characters, however, this species is much like hungerfordi and nielini. T. fuscata does not seem to be closely related to the other species of this group. The claspers, aside from the projection on the right one, are much different and the wings are either absent or reduced to mere vestiges, an evidence of specialization. 56 The University Science Bulletin Group II, consisting of those species which do not have mustache- like bristles on the lateral margins of the prothorax (PI. X, fig. 17), includes the following species: costaricana, incerta, mexicana, mar- morata (in all probability), pulchra, selecta, serrata, signata, socialis and tnincata. These species fall into three clearly delimited groups which the writer designates as the "truncata group," the "signata group," and the ''selecta group" although this last group contains but the one species. T. costaricana, marmorata, pidchra, and trun- cata compose the truncata group, which is characterized by the fact that the posterior margin of the pronotum is truncate in front of the bases of the hemelytra. The members of this group are the smallest of the known species of Tenagobia and are very similar to each other. The signata group, composed of incerta, mexicana, serrata, signata, and socialis, is characterized by the large spur-like seta on the lower margin of the fore femur. The species of this group are very similar in appearance and can be definitely distinguished from each other only by the claspers. In fact, Lundblad considers this group to be but a single species, signata, and its varieties. The remaining species, selecta, of Group II is very distinct from any of the other species of the genus. It is not only the largest of the species, but the tergite lobe of the eighth abdominal segment (PI. IX, fig. 12) has become developed into a peculiarly shaped finger- like process. Its claspers are also different from those of any other species of the genus, the left (PI. XI, fig. 14) , however, is somewhat like that of fiiscata. The number of spine-like setae on the fore femur and the cleft in the right side of the sixth abdominal tergum (PI. IX, fig. 12) which bears a row of simple setae are the same characters which are found in the hungerfordi group of Group I. Whether these last characters are more indicative of relationship than the mustache-like bristles on the lateral margins of the epi- mera of the prothorax, the writer is unable to say. SUMMARY OF GROUPS WITHIN THE GENUS i" Group I. Characterized by the presence of mustache-like bristles on the ('liimera of the prothorax. , _, , . , ijT.conslncla 1. The constncta group J'j.. romani 2. The hunger jordi group. T. Juscata T. hunger jordi T. melini T.schadei ■■!! i Western Hemisphere Corixidae 57 Gfiour. II. Characterized by the absence of mustache-like bristles on the epimera of the prothorax. r T. costaricana 1. Ihe truncata group wr i i, >= ^ 7 . pulchra 2. The signala group. T. truncata T. incerta T. mexicana T. serrata T.signata T. socialis 3. The selecta group T. selecta DISTRIBUTION The insects belonging to the genus Tenagobia are confined to the Neotropical and southern extremity of the Nearctic Regions. The known range of the genus is shown in Plate XIV. The numbers on this plate mark the places where material has been collected ex- cept "1" which represents Uhler's California record and "17" which represents the type locality of T. marmorata, the actual lo- cality in Venezuela where this species was taken not being known. Although many more data are needed to determine the range of most of the species, the extreme limits of the range of the genus are rather definitely known. This statement is based on evidence which is diflScult to show graphically. The map (PI. XIV) shows the localities in which members of the genus have been taken, but gives no indication of the many other localities in which collections have been made without securing specimens of the genus. For example, Dr. R. H. Beamer of the University of Kansas has made intensive and extensive collections of the hemipterous fauna along the bound- ary of the United States and Mexico, but has not taken a single specimen of Tenagobia. This is very good evidence that no mem- bers of the genus occur in the southern United States at present. One of the most striking features of the distribution of the genus is that it extends almost equal distance north and south of the equa- tor. The extreme limits of north and south distribution are Cali- fornia (33° ? N. lat.) and Buenos Aires (35° S. lat.). The northern record is that of Uhler and he does not state in what part of Cali- fornia the specimens which he saw were taken. The most northerly locality from which the writer has seen specimens is Nainari, Sonora, Mexico (28° N. lat.). The members of the genus seem to be confined principally to re- gions of low altitudes. Most of the specimens have been taken in lo- calities below an altitude of 250 feet. Indeed, specimens have been collected at but six places which have an altitude of over 1,000 feet. 58 The University Science Bllletin These are Cuernavaca, Morelos, Mexico, 5,418 feet altitude, where one specimen was taken at light; Puerto Bermudez, Rio Pichis, Peru, between 1,000 and 2,000 feet altitude; Rio IMapiri, Bolivia, 1,400 feet altitude; Santa Cruz, Bolivia, 1,350 feet altitude; and Piropara and Lassance, Minas Geraes, Brazil, about 1,000 feet alti- tude. The range of the genus, except for Califomia on the north, Buenos Aires and Montevideo on the south, and the few localities above 1,000 feet altitude, lies within the tierra caliente thermal region, that is, the region having a mean annual temperature above 72.5° F. The highest mean annual temperature of any place in the genus range is 82.2° F. ex of scutellum to apex of clavus is as 18:40:70. Wings: Present in both sexes. Abdomen: 5th, 6th and 7th segments each with 2 short spine-like setae on either side, 8th segment with one terminal and 3 lateral spine-like setae on either side, the tergite lobe (PI. X, fig. 7) with a few weak hair-like setae, the right half of segment with a hump-like projection on the mesal margin near the caudal end from which arises a tuft of short bristles. Claspers: The right (PI. XII, fig. 12) serrate ventrally, the heel right angled, toe slightly produced, broadly rounded at apex; the left (PI. XII, fig. 8) rather simple, heel not developed, toe sharply pointed. Legs: Front, femur with a stiff spur which arises from a papilla-like projection on the lower side (PI. XIII, figs. 2, 3) ; above this on the inner side is a row of 4 spine-like setae; tarsus shorter than tibia, 16-17 bristle-like setae in the lower row, 14-16 short setae in inner row, 10-11 long hair-like setae in upper row ; tarsal claw short and broad except at distal end where it is suddenly constricted. The ratio of lengths of femur, tibia, tarsus and tarsal claws of middle leg is as 60:19:25:20. The tarsal claw of hind leg is 3-pronged, one being very short, and the one of medium length being over three-fourths as long as the longest. Cotypes. Rio Purus, Brazil, 9 specimens, November, 1873 (J. W. H. Traill), in Perth Museum, Perth, Scotland, and British Museum (Natural History). 76 The University Science Bulletin Synonyms. As pointed out in the general discussion on synonymy, socialis var. sobrina (White), sedvcta (White) and simulans (White) are all synonyms of T. signata. The writer also pointed out at that time that on account of their geographical distribution that he believes the specimens of T. socialis collected by Doctor Traill at Anana, Upper Amazon, November, 1874, and at Urubu Caxoeira, November, 1874, belong to signata. Distribution (PI. XIV). Brazil: Rio Jurua, Rio Purus, Tonan- tins, Upper Amazon. Collection Data. Rio Purus, 9 specimens, November, 1873 (J. W. H. Traill), type locality; Rio Jurua, "many specimens at light" October and November, 1874 (J. W. H. Traill), seducta; Urucaca, Rio Jurua, "many specimens" (J. W. H. Traill), socialis var. so- brina; Upper Amazon, October 13, and Tonantins, December 12, 1874, 3 females (J. W. H. Traill) , sm;//ans. The writer, through the kindness of Dr. W. E. China, has ex- amined specimens of the cotypes and all of the synonyms. Lundblad refers some female specimens collected by Ramon in the Rio Autaz, near Manaos to signata, but they are probably specimens of incerta or socialis. The writer has examined many specimens of the signata group which have been collected on the Amazon from Manaos to its mouth, but no T. signata specimens have been among them. In fact, no specimens of this species have been taken since Traill's Expedition in 1873-75, but on the other hand, no collections of Tenagobia have been made in the Upper Amazon, Jurua and Purus rivers since that time. The fact that signata has not appeared in the collections that have been made since the above expedition is a good indication that this species is restricted to that region. The specimens in the Zoologische Staatsinstitut und Zoologische Museum of Hamburg which were referred to signata by Jaczewski belong to socialis and mexicana. That is, the specimens from Paramaribo, Dutch Guiana, are socialis, and those from Mexico are mexicana. Comparative Notes. As stated previously in this paper under the heading "groups within the genus," signata, socialis, incerta, mexicana and serrata compose a group of very similar species which the writer (3) has designated as the signata group. The females of this group are practically indistinguishable from each other, but the males exhibit definite, constant characters which are specific. For this reason, and because of the distribution of these species, the Western Hemisphere Corixidae 77 writer believes them to be distinct species. Lundblad reduced socialis to a variety of signata and described incerta as a variety of it. The other two species of the group had not been described at that time. The species can be easily distinguished from each other by the shape of the male claspers. An idea of the differences in these claspers can be obtained more clearly by studying the illustra- tions in Plate XII than from a verbal description of them. Both claspers of mexicana (figs. 6, 13) are distinct; the left claspers of signata (fig. 8) and serrata (fig. 7) are very similar, and that of incerta (fig. 10) resembles them, but the right claspers of these three species (figs. 12, 15, 11) are very distinct; on the other hand, the right claspers of socialis (fig. 14) and serrata (fig. 15) are somewhat alike, but the left claspers of these two species (figs. 7, 9) are dis- tinct. Tenagobia incerta Lundblad (Plate XII; figs. 10, 11) 1928. Tenagobia signata var. incerta Lundblad. Ark. f. Zool. Bd. XXA(7) :16-18. 1894. Sigara socialis White. Uhler, P. R. Proc. Zool. Soc. London :224. (Mistaken identity.) 1983. Tenagobia signata var. incerta Lundblad. Jaczewski, T. Ann. Mu.*. Zool. Polonici, X(l):2-3. Size. Length, male, 2.55-2.8 mm.; female, 2.85-3.0 mm. Width of head, male, 1.0 mm.; female, 1.1 mm. Color. As in T. signata. Structural Characteristics of Male. Head: As in signata except an eye is but three-fourths as wide as interocular space, and caudo- lateral angles of vertex are nearly right angles. Prothora.v: As in signata; pronotum about 5^2 times its median length, and about 1.8 times wider than the base of scutellum. Scutellum: About 3 times longer than median length of iironotum. Hemelytra: As in signata. Ratio of lengths of pronotum, scutellum and from apex of scutellum to apex of clavus is as 2:6:10. Wings: Present in both sexes. Ab- domen: As in signata. Claspers: The right (PI. XII, fig. 11) is not noticeably serrate ventrally, heel acute, much produced, ventral margin of clasper excavated immediately proximad to it, toe nar- rowed and produced; the left (PL XII, fig. 10) is rather simple, resembling that of signata and serrata, but toe is not produced and is rounded. Legs: As in signata except the fore tarsus has 14-15 bristle-like setae in lower row, 14-15 small setae in inner row and only 6-7 long hair-like setae in upper row; the middle-sized prong of the hind tarsal claw is only one-half as long as the longest. 78 The University Science Bulletin Holotype. Male, Villa Rica, Paraguay, May, 1925 (F. Schade), in Museum at Helsingfors, Finland. Allotype and Paratypes. As above. Distribution (PL XIV) : Bolivia, Brazil (Amazonas, Matto Grosso, Minas Geraes, Para), Grenada, Paraguay, Peru, Trinidad. Collection Data. Bolivia: Province del Sara, 2 females, Nov. 30, 1912 (J. Steinbach), 1 male, 2 females, Feb., 1913 (J. Steinbach), 1 male, 15 females, Dec, 1918 (J. Steinbach) ; Puerto Saurez, 2 females, alt. 500 feet (J. Steinbach) ; Rio Mapiri (W. M. Mann, Mulford Biol. Exp. 1921-'22) ; Santa Cruz de la Sierra, 1 male, 4 females, alt. 1,350 feet, Nov., 1910 (J. Steinbach). Brazil: Manacapura, Solimoes river, Amazonas, 2 males, 2 fe- males, June, 1926 (S. M. Klages) ; Corumba, Matto Grosso, 57 males, 84 females, Dec. 14 to 22, 1919 (R. G. Harris) ; Lassance, Minas Geraes, 11 males, 32 females, Nov. 9, 1919 (R. G. Harris) ; Piropara, Minas Geraes, 22 males, 44 females, Nov. 11, 12, 1919 (R. G. Harris); Para (Belem), 1 male, 2 females, Dec. 6, 1907; Pernambuco ^^ (Recife), westwards of Ohnda, a fresh-water pool on a roadside, 8 females, 1 nymph, Nov. 28, 1931 (Roszkowski and St. Feliksiak) ; Pernambuco, near Boa Viagem, large pool, 3 males, 1 female, 2 nymphs, Nov. 29, 1931 (Roszkowski and St. Feliksiak). Grenada, Lesser Antilles: Woburn, 2 males, 4 females, no date, labeled P. R. Uhler Collection ize : Unfortunately Doctor Lundblad does not mention the size. Color: The color is decidedly lighter than in H. reinhardti. The pronotum has more extended lighter figures which are richly branched, irregular and partly run together. These are arranged in four or five cross bands. The hemelytra, while having the left membrane almost clear as in the preceding species, are strongly dif- ferent in other respects, insofar as the lighter figures are much more richly developed; especially the base of the clavus is lighter; else- where the dark and light figures occupy an equal amount of space; they are very irregular and partly lost in fine dots as if sprinkled; on the outer end of the marginal area there is a very plain dark Western Hemisphere Corixidae 113 spot and a second longer one on the outer margin of the membrane near its apex. Structural characteristics: Pronotum weakly wrinkled. Hemel- ytra entirely smooth and shining. Head of male with the frontal depression not very deep but plainly extended between the eyes and covered with long hairs. The antennae in the type were deformed and so not measured. The thorax with a shorter pronotal disk than in H. reinhardti, and the metaxyphus has a different outline with more parallel sides. The corium of the hemelytra has, besides the fine hairs, thorns which are pointed toward the rear. These are en- tirely lacking in H. reinhardti.^ In the front leg of the male the femur lacks the outer hair brush figured for H. reinhardti; the tibia with its distal point extended above; the pala is small but in proportion to the tibia somewhat larger than in H. reinhardti; the pala is not plainly contracted but abruptly narrowed beyond the last upper edge hair; the strigilar thorn row is also less strongly bent; as in H. reinhardti the basal strigil thorns are bristle-shaped (some 11 of them) , then follows the curved row of 7 thorns of more normal structure and finally 2 bristle-shaped thorns. The inner bristles of the pala under edge, which are not shown in the drawing, are about 13. Those at the end of the row are not so strongly lengthened as in H. reinhardti; also not shown in the drawing are some 16 bristles, and the upper edge hairs 8 long ones and one very short one basally present. Both middle legs are gone in the type. Hind legs have the femur without thorns dorsally ancl with about 22 thorns in 2 rows of which one row only contains 4 or 5 standing singly and the others are formed in groups of several. The fourth abdominal segment is after the same plan as in H. reinhardti but the hind margin hairs of the tergite are more numer- ous and longer and the right lobe or tongue less protruding and the side edge with 4 instead of 3 thorns. The fifth abdominal segment also reminds one of H. reinhardti; namely, the tergite has a prae- strigil but the comb has only 11 teeth which are clearly separated by small spaces. The comb is much less pronounced. The sixth abdominal segment has a strigil of more common appearance, not as strongly lengthened. It is composed of two regular and several irregular shorter comb thorn rows. Left of the strigil is also a row of long hairs. In the seventh abdominal segment the median tongue * Doctor Lundblad calls attention to the value of this character in separating species in this genus as he had used it in the genus Trichocorixa. 8—822 114 The University Science Bulletin of the hind margin is large, triangularly pointed and has numerous and long hairs on its edge. The lateral margin of the right side shows an indentation, an incurve margin, and before it a corner with a bristle; both lateral margins carry fairly thick hairs. The ninth abdominal segment or genital capsule as in H. reinhardti ; tiie right genital clasper of very peculiar shape. It gets smaller very abruptly to a very plain point. The left clasper, while different in several respects, corresponds to that of H. reinhardti. It lacks hooks and is entirely smooth. See Plate XVI for reproduction of Lund- blad's drawings. Location of types: A male and female from Brazil in the Zoolog- ischen Museum in Kopenhagen where they belong to the large insect collection presented by B. W. Westermann. Comparative notes: While we have not seen this species, the males should be recognized by the indentation of the right margin of the seventh abdominal segment. None of the series before us has this indentation. This is a character which in other genera of Corix- idae has proved of specific value. Its closest relatives are //. hes- peria and H. brasiliensis which also have the short spines on the hemelytra, the hind femur with the basal two-fifths pilose and nu- merous spines on its ventral side, and a metaxyphus shorter than the inner line of the hind coxae. Data on distribution: See Plate XX. Heterocorixa lundbladi n. sp. (Plate XVI, figs. 2, 2a-2c) Size: Length 5.33 mm. to 5.88 mm.; width across the head 1.8 mm. to 1.89 mm. Color: General facies medium to light; head yellow, its caudal margin with a narrow brown line; pronotum with three or four in- definite brown bands; hemelytra brown with small yellow vermicu- late figures ; inner basal angle of the clavus with lighter areas larger ; the right membrane with pattern continuous with corium; the left membrane white to transparent without pattern. Legs and venter yellow. Structural characteristics: Head longer than the short pronotal disk; facial impression of male elongate oval with some appressed facial hairs; the relative length of the antennal segments: 1:2: 3 : 4 : : 19 : 14 : 29 : 19^ ; 1 : 2 : 3 : 4 : : 20 : 16 : 30 : 20 $ . Pronotal disk roughened, rugulose. Hemelytra smooth, shining, with slender appressed hairs and corium with numerous short spines. Western Hemisphere Corixidae 115 Mesoepimeron long and slender but broader than lateral lobe of the prothorax, the osteole of the scent gland well before its tip with a tuft of hairs. The metaxyphus variable but usually broadly or un- evenly rounded at tip. The front leg of the male without a carina on the caudal surface of the tibia; dorsal line of pala not notched; tip of pala blunt, the row of about seven pegs continued to the base by spine-like pegs; the upper palmar row contains about eight elongated pegs. The middle leg: femur : tibia : tarsus : claws : : 100 : 45.1 : 25.1 : 31.7. The hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 85.3 : 108.8 : 55.9. Basal two-fifths of femur pilose; its upper surface without spines, its lower surface with a dozen or more spines. Male abdomen as shown on Plate XVI; the prestrigilar comb of about 9 teeth; the dorsal median lobe of the seventh segment triangular. The claspers as shown on Plate XVI. Comparative notes: This species is close to H. westermanni Lundblad from which it differs in not having an indentation on the right margin of the seventh abdominal segment in the male. Location of types: Described from 15 males and 26 females labeled "Manacapura, Brazil, Manaos, Amazon, March, 1928, S. M. Klages." Holotype, allotype and paratypes in the Francis Hunt- ington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate XX) Known only from the type series from Brazil. Heterocorixa jaczewskii n. sp. (Plate XVI, figs. 3, 3a-3c) Size: Length 6.1 mm. to 7 mm.; width across the head 1.76 mm. to 1.8 mm. Color: General facies medium; head yellow, caudal edge black; pronotum yellowish crossed by four brown bands and flecks of brown in the pale interspaces; hemelytra with coarse vermiculate figures, the pale ones on the whole larger than the brown, although in the male the dark bands are more or less run together on the distal corial area; the right membrane with pattern continuous with that of corium; the left membrane white to transparent with- out pattern. Venter grayish to brown ; legs yellow. Structural characteristics: Head longer than the reduced pro- notal disk; facial impression of the male obovate, rather pointed above with some appressed facial hairs; the relative length of an- tennal segments: 1 : 2 : 3 : 4 : : 19 : 17 : 38 : 18 5 . Pronotal 116 The University Science Bulletin disk rugulose. Hemelytra smooth, shining, with slender appressed hairs and corium with numerous short spines. Mesoepimeron long and slender but broader than lateral lobe of the prothorax, the osteole of the scent gland well before its tip with a tuft of hairs. The metaxyphus parallel-sided, blunt at tip which attains the end of inner line of hind coxa. The front leg of male without a carina on the caudal surface of the tibia; dorsal line of pala not notched; the peg row consisting of 9 pegs, the distal 6 long and sharp; spine- like pegs continue the peg row to base of palm; an upper palmar row of slender spine-like pegs. Middle leg: femur : tibia : tarsus : claws :: 100 : 42.9 : 27 : 33.4. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 75.1 : 108.4 : 47.3. Basal two-fifths of femur pilose; its upper surface without spines, its lower surface with a dozen or more spines. Male ab- domen as shown on Plate XVI; the prestrigilar comb of about 12 spines; strigil of five combs; median lobe of seventh abdominal segment of male very slightly produced and forming almost a straight line with right tergite. The claspers as shown on Plate XVI. Com'parative notes: In this species the male pala is more pointed than in H. lundbladi n. sp. and the median lobe of the seventh ab- dominal segment is much less developed than in H. wrighti Hun- ger ford. Location of types: Holotype male and allotype female, labeled "Brazil, S. A., Pernambuco, XII, 1931, via Jaczewski." These are in the Francis Huntington Snow Entomological Collections, Uni- versity of Kansas. The specimens were sent to us by Doctor Jac- zewski labeled Heterocorixa westermanni Lundb. Since they are not that species, we have named the species in his honor. Data on distribution: (Plate XX) Known to us only by the types but additional specimens should be in the National Museum at Warsaw, Poland. Brazil: Bello Horizonte, April, 1935, D. M. Cochran (U. S. N. M. Coll.), 1 female (compared with types). Heterocorixa wrighti n. sp. (Plate XVII, figs. 4, 4a-4c) Size: Length 6 mm. to 6.8 mm.; width across head 1.78 mm. to 2 mm. Color: General facies medium; head yellow, caudal edge black, pronotum yellowish crossed by four or five brown bands and flecks Western Hemisphere Corixidae 117 of brown in the pale interspaces; hemelytra with moderately coarse vermiculate figures, the pale ones on the whole slightly larger than the brown and decidedly larger at the inner basal angle of the claviis; the right membrane with pattern continuous with that of corium; the left membrane white to transparent without pattern. Legs yellow, venter gray to yellow. Structural characteristics: Head subequal in length to moder- ately developed pronotal disk; facial impression of the male obo- vate, leather pointed above with some appressed facial hairs; the relative length of antennal segments: 1 : 2 : 3 : 4 : : 20 : 14 : 38 : 18 5 . Pronotal disk rugulose. Hemelytra smooth, shining, with slender appressed hairs and corium with numerous short spines. Mesoepimeron long and slender but broader than the lateral lobe of the prothorax, the osteole of the scent gland well before its tip with a tuft of hairs. The metaxyphus rather slender, nearly par- allel-sided, blunt at tip which does not quite attain the end of the inner line of hind coxa. The front leg of male without a carina on the caudal surface of the tibia ; dorsal line of pala not notched ; the peg row consisting of eight pegs, the distal two of which are slender; spine-like pegs continue the row to base of palm; an upper palmar row of short slender spine-like pegs. Middle leg: femur : tibia : tarsus : claws :: 100 : 48.1 : 27. 8 : 38.9. Hind leg: femui' : tibia : tarsus 1 : tarsus 2 : : 100 : 92.8 : 114.2 : 42.8. Basal two-fifths of femur pilose, its upper surface without spines, its loM^er surface with a dozen or more spines. Male abdo- men as shown on Plate XVH; the prestrigilar comb of about 12 spines; strigil of 5 or 6 combs; median lobe of seventh abdominal segment of male elongate, triangular. The claspers as shown on Plate XVn. Comparative notes: This species belongs to the H. hesperia group and is separated from H. jaczewskii Hungerford by its more devel- oped median lobe of the seventh abdominal segment. Location of types: Holotype, allotype and 34 paratypes (17 males, 17 females) labeled "Brazil, S. America, No. 11395, Stillman Wright." These are in the Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate XX) Besides the above we have the following: "Brazil, S. America, No. Ill, Stillman Wright, Areia, Parahyba, Lat. 7, Long. 36," 3 males, 7 females; "Brazil, S. America, No. 5530, Perhyba, Souza, Lat. 7, Long. 38," 3 females; "Brazil, S. 118 The University Science Bulletin A., Nov. 4, 1937, S. Wright, Bon Acude Marangiiape, Ceara," 1 male. Heterocorixa wrighti olallai n. subsp. (Plate XVII, figs. 3, 3a-3c) Size: Length 5.8 mm. to 6.5 mm.; width across head 1.68 mm. Color: Same as for H. wrighti. Structural characteristics: The females not distinguishable from H. wrighti. The antennal segments: 1 : 2 : 3 : 4 : : 18 : 16 : 35 : 15 ? . Middle leg: femur : tibia : tarsus : claws :: 100 : 49 : 28 : 35. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 85.8 : 108.7 : 45.8. The male pala, claspers and abdominal dorsum as shown on Plate XVII. One to three little spines to the left of the strigil are not present in H. wrighti and the basal lobes of the eighth ab- dominal segment are slightly different in shape. Location of types: Holotype and two male paratypes labeled ''Brazil, S. A., 7-10-9-20, 1936, A. M. Olalla, vie. of Joao Pessoa (Sao Philipe) River Jurua, No. 379." In Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate XX) We have also 7 males, 2 fe- males labeled "Brazil, S. A., Sept., 1935, A. M. Olalla, Rio Purus, Castanha Region." Heterocorixa anduzei n. sp. (Plate XIX, figs. 8, 8a-8f) Size: Length 4.83 mm.; width across head 1.47 mm. Color: Anterior half to tip of clavus pale, mottled with brown, posterior half black. Head with a dark spot on the front of the vertex and the posterior margin of head black; pronotum with very small brown spots, close together on a lighter background and with- out design, along anterior margin the figures are effaced; caudal margin black; clavus and basal two-thirds of corium with more or less reticulate brown figures, figures on inner basal angle of clavus effaced; remainder of corium and membrane black on both hem- elytra; the embolar groove frosty black. Face, thoracic venter and legs pale; abdomen dark. Structural characteristics: Head rather long, subequal to the rather well developed pronotal disk; interocular space narrow, about half the width of an eye with a median longitudinal ridge between the inner angles of the eyes; anterior margin of the head Western Hemisphere Corixidae 119 steeply curving from the median line ; facial impression of the male deep, extending halfway up between the eyes, facial hairs moder- ately abundant, appressed; the lower margin of the subocular area medianly produced, a characteristic feature of this species; the third antennal segment produced beyond the base of the fourth; their relative over-all lengths being 22:15. Pronotal disk moder- ately roughened with about 10 transverse grooves, making the sur- face appear corrugated in certain lighting. Hemelytra smooth, shining with numerous appressed hairs, mostly dark. Mesoepime- ron slender, the osteole of scent gland well before its tip and with a tuft of long hairs. Metaxyphus very long, very slender, pointed and attaining the tip of the coxal projection. The front leg of the male unique (see Plate XIX) ; the tibia greatly produced over the basal half of the pala, with two tiny combs subapically and three pegs and four spines at its junction with the pala, its greatest di- ameter about half way between the pala and its base; the pala itself slender, elongate, with five large pegs at distal end of a row of twelve spine-like pegs, the length of which decrease toward the base; the upper palmar row consisting of elongate spine-like pegs. The middle leg — Femur : tibia : tarsus : claws : : 100 : 44.8 : 33.6 : 20.2 ; femur rather slender with weak spines and a short thick set row of about 25 swimming hairs on its median ventral section. The hind leg — Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 95.8 : 114.4 : 57.2; only the extreme base of femur pilose and without dis- cernible spines either above or below; spines on tibia and tarsus moderately stout; a few swimming hairs on rear margin of femur near tip and on posterior margin of tarsus. Male abdomen as shown on Plate XIX; the usual strigil replaced by a comb of cau- dally directed teeth. Genital claspers as shown on Plate XIX. Location of type: Described from a single male specimen la- beled "Venezuela, S. A. Surukum, June, 1941, P. J. Anduze." Type in Francis Huntington Snow Collections, University of Kansas. (See Plate XX.) Comparative notes: The exceedingly slender and elongate meta- xyphus, the remarkable prolongation of the male tibia and the median production of the lower margin of the subocular area iden- tify this remarkable species. Its general color pattern is nearest that of H. boliviensis from which it is structurally very distinct. 120 The University Science Bulletin Heterocorixa williamsi Hiingerford (Plate XVIII, figs. 4, 4a-4c) 1928. Heterocorixa ■williamsi Hiingerford, H. B. Bull. Brooklyn Ent. Soc. XXIII, No. 2, pp. 99-100, Plate III, figs. 10, 11 and 12. Size: Length 4.2 mm. to 4.6 mm.; width across the head 1.35 mm. to 1.47. Color: Rather pale; the dark color reddish brown to brown and the light color pale lemon yellow. Caudal margin of head black ; pro- notum pale, with four or five reddish brown curved bands, the median of which is broader than the others ; the hemelytra mottled with the light and dark figures about evenly divided; the pattern in oblique series on clavus and more or less longitudinal on corium; a submar- ginal dark stripe extends from tip of right clavus, diverging some- what from the margin until it vanishes in the field of the membrane ; the reticulate pattern continued on the right membrane; the left membrane smoky brown without pattern; embolar groove pale to frosty black ; legs and venter yellow. Structural characteristics: Head longer than the very short pro- notal disk, which it embraces; anterior curve of the head as seen from above broadly rounded; head without median longitudinal carina; inner margin of the eyes' as seen in cephalic view plainly divergent; facial depression of the male very slight; facial hairs few, appressed; the relative length of the antennal segments are as follows: 1 : 2 : 3 : 4 :: 15 : 12 : 20 : 10. Pronotal disk lightly rugulose. Hemelytra smooth, shining with a few appresged hairs. Mesoepimeron slender, the osteole of the scent gland well before its tip with a tuft of hairs. Metaxyphus long, slender, acuminate, sur- passing the inner distal margin of the coxae. The front leg of the male appears to have no pad at end of tibia; the pala with a dorsal carina at its base. There are 13 stout pegs preceded by about 9 spine-like pegs; the upper palmar row of spine-like pegs longest distally. The middle leg — Femur : tibia : tarsus : claws : : 100 : 49.2 : 28.7 : 32.8; moderately stout with weak spines. Hind leg — Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 96.6 : 104.6 : 61.2; moderately stout; only the base of hind femur pilose, its surface without discernible spines; tibia with moderate spines. Male abdomen and genital claspers as shown on plate XVHI. Location of types: Described from 26 specimens (7 males, 19 fe- males) taken at Tena, Ecuador, February 23, 1923, by Doctor F. X. Western Hemisphere Corixidae 121 Williams. Holotype, allotype and paratypes in Francis Huntington Snow Entomological Collections, University of Kansas. (See Plate XX). Comparative notes: This pale species, with its broadly rounded head and short pronotal disk, is very easily identified, and yet cer- tain details of its structure are very close to H. woytkowskii which is a black species with well developed pronotal disk. Its metaxy- phus is narrower and more sharply pointed, and the spiny armature of the middle and hind legs less developed than in H. woytkowskii. The prestrigilar teeth are longest to the right of the strigil in H. williamsi which is not true for H. woytkowskii. Heterocorixa boliviensis Hungerford (Plate XVIII, figs. 5, 5a-5c) 1928. Heterocorixa boliviensis Hungerford, H. B. Bull. Brooklyn Ent. Soc, XXIII, No. 2, pp. 100-101, Plate III, figs. 5, 6 and 7. (Fig. i = H. nigra.) Size: Length 4.2 mm. to 5.25 mm.; width across head 1.47 mm. to 1.64 mm. Color: General color effect dark, the pattern in some series mot- tled throughout, in others distal third of corium and membranes black. Head white to yellowish with postocular area more deeply pigmented, its rear margin brown to black; pronotum crossed by 5 to 10 brown ragged-edged bands that anastomose here and there; the clavus with similar brown figures arranged obliquely with the figures usually effaced from inner basal angle. Hemelytra, includ- ing the membrane, may be mottled throughout with crowded fig- ures or beyond the tip of the clavus may be suffused with black and pattern entirely obscured; left membrane may be white, trans- parent or black but lacks the pattern that may be present on the right membrane ; the embolar groove frosty black. Thoracic venter and legs white to yellow. Abdominal venter a little darker in the females and may be nearly black in some males. Structural characteristics: Head not longer than the pronotal disk; anterior curve of the head as seen from above shows the ver- tex advanced beyond the curve of the eye; facial impression of the male moderately extending above the inferior angle of the eyes; facial hairs scattered, appressed; the relative lengths of the an- tennal segments are as follows: 1 : 2 : 3 : 4 : : 18 : 10 : 20 : 18. Pronotal disk roughened, sometimes with transverse grooves asso- ciated with the brown bands. Hemelytra smooth, shining with appressed slender hairs. Mesoepimeron slender, the osteole of the 122 The University Science Bulletin scent gland well before the tip and with a tuft of hairs. Meta- xyphus slender elongate, its tip attaining distal inner margin of the hind coxae. The front leg of the male with a large tibial pad that lies in a depression on the front of the pala with 6 to 8 pegs in a broken row, having 4 or 5 pegs beyond the break and 2 or 3 smaller pegs before it, the row continued by elongate spine-like pegs to the base; the upper palmar row of spine-like pegs longest apically. The middle leg — Femur : tibia : tarsus : claws : : 100 : 48 : 28 : 26.4; femur with moderate spines and a row of weak swimming hairs on its dorso-caudal margin more noticeable in the males. The hind leg — Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 93 : 114 : 57; moderately stout; only the base of the femur pilose, its upper surface without spines, its lower surface with 5 or 6 weak spines faintly discernible; tibia with stout spines on anterior and posterior margins and a few swimming hairs ; the tarsus with spines on anterior margin and swimming hairs on posterior margin. Male abdomen as shown on Plate XVIII. The prestrigilar teeth to the left of the median line of the strigil long and somewhat turned ventrally, those to the right shorter and continued to the right mar- gin; the strigil roughly triangular, its inner margin curved. The dorsal lobe of the left half of the eighth abdominal segment pointed, its surface covered with stout semiappressed spines. Genital clasp- ers as shown on Plate XVIII. Comparative notes: While this species agrees with H. woytkow- skii in having a pad on the end of the male tibia, its right clasper is more like that of H. chapadiensis. In the type series and those from Brazil there is only a faint suggestion of black on the distal third of the hemelytra. Most of the others have a moderate to distinct black band. Location of types: Described from 5 male and 13 female speci- mens bearing the label "Buenavista, Bolivia, Dept. Santa Cruz, S. A., Sept. 21, 1923, R. T. Steinback." Holotype, allotype and para- types in Francis Huntington Snow Entomological Collections, Uni- versity of Kansas. Data on distribution: (Plate XX) Besides the type series we have the following: Bolivia: "R. Beni, Puerto Salinas, Nov., 1937, A. M. Olalla." 1 male, 5 females. "R. Beni, Victoria, Oct., 1937, Junction of Madre de Dios and Beni Rivers." 2 males, 2 females. Western Hemisphere Corixidae 123 Ecuador: "Oriente. E. Rio Napo watershed. Jatun Yacu 700 meters, Mar. 28, 1937, Clarke Maclntyre." 2 males. Brazil: "Vic. Joao Pessoa (Sao Philipe) River Jurua, July 10 to Sept. 20, 1936, A. M. Olalla." 13 males, 25 females; Utinga Belem, Para, Aug. 1946, L. and M. Deane. Peru: "Dept. Huanuco. Vic. Leonpampa, Jungle 800 m. a. s. 1. Forest Pools, Dec. 12-14, 1937. F. Woytkowski No. 385." 31 males, 65 females; "Dept. Huanuco, Vic. Leonpampa, Jungle 800 m. a. s. 1. Dec. 11-30, 1937, F. Woytkowski No. 3811." 23 females; "Dept. Huanuco, Loc. Shapajilla. Jungle 630 m. a. s. 1. Aug. 2, 1938, F. Woytkowski, No. 3848." 4 males, 32 females; "Dept. Huanuco, Loc. Shapajilla. Jungle 630 m. a. s. 1. Aug. 1, 1938, F. Woytkow- ski, No. 3850." 6 males, 10 females. Heterocorixa chapadiensis Hungerford (Plate XVIII, figs. 2, 2a-2c) '1928. Heterocorixa hesperia var. chapadiensis Hungerford, H. B. Bull. Brooklyn Ent. See, XXIII, No. 2, p. 102, PI. Ill, figs. 1, 2 and 3. &ize: Length 4.2 mm. to 5.25 mm.; width across the head 1.47 mm. to 1.6 mm. Color: General facies dark brown, the holotype with a black band across the middle of the hemelytra. Head yellowish brown with its caudal margin black. Pronotum may be brown with pale figures obscured or with 7 or 8 transverse ragged bands of lighter brown; the hemelytra mottled with rather coarse figures; the right mem- brane with the same pattern, the left membrane white to transparent without pattern. Legs and thoracic venter yellow to brown, ab- dominal venter darker in the male. Structural characteristics: Head nearly as long as the well devel- oped pronotal disk ; anterior margin of the head rather steeply curv- ing from the median line ; facial impression of the male not well de- fined; facial hairs inconspicuous, appressed; the relative lengths of antennal segments: 1 : 2 : 3 : 4 : : 17 : 12 : 22 : 10 $ . Pronotal disk roughened, rugulose and with transverse grooves; the grooves following the deeper pigmentation. Hemelytra smooth, shining, with a few appressed hairs. Mesoepimeron slender, the osteole of the scent gland well before its tip with a tuft of hairs. Metaxyphus long and slender, its acuminate tip attaining the distal inner margin of the hind coxae. The front leg of the male with a longitudinal carina on the caudal surface of its tibia. The pala is notched above and distal end twisted; the peg row with 11 pegs in an inverted V, 124 The University Science Bulletin the distal portion with 7 pegs, 5 of which are stout, and basal por- tion of 4 smaller pegs; the row continued to the base by 9 spine-like pegs ; the upper palmar row of elongate spine-like pegs. The middle leg — Femur : tibia : tarsus : claws : : 100 : 43.3 : 32 : 22; femur moderately stout, elongate with moderately long spines. The hind leg — Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 100 : 122.4 : 63.2 ; only the base of femur pilose, its upper surface without spines, its lower surface with about 7 inconspicuous spines; tibia with stout spines on anterior and posterior margins and swimming hairs on posterior margin. Male abdomen as shown on plate XVIII. Prestrigilar comb long, of many teeth ; a secondary comb or row of spines to left of strigil. Claspers as shown on plate XVIII. Comparative notes: This was described as a variety of H. hesperia White but differs from that species in its coarser color pattern, longer metaxyphus, much longer prestrigilar comb and more palar pegs in the male. Location of type: The holotype from Chapada, Brazil, in the Francis Huntington Snow Entomological Collections. University of Kansas. Data on distribution: (Plate XX) In addition, we have 2 females from Para, Brazil. Heterocorixa woytkowskii n. sp. (Plate XVIII, figs. 1, la-lc) Size: Length 4.2 mm. to 4.8 mm.; ^idth across head 1.47 mm. to 1.7 mm. Color: Very dark brown to black, the pronotum and hemelytra entirely lacking the pale spots described for H. nigra, the membrane of the left hemelytron pigmented like the right. Head with the postocular area and face including the subocular area dark brown to black ; the vertex and so-called beak white. The embolar groove frosty black. Legs brown to black, including anterior femora. Thorax and abdominal venter brown to black. Structural characteristics: Head no longer than pronotal disk. Anterior margin of head less prominent that in H. nigra; postocular area broad, its surface along caudal margin wrinkled or coarsely rastrate; head with faint median carina; facial impression of male shallow and transverse; facial hairs few, appressed; the relative lengths of the finely haired antennal segments are as follows: 1:2: 3 : 4 : : 17 : 14 : 20 : 12. Pronotal disk roughened, rastrate and Western Hemisphere Corixidae 125 transversely grooved; the grooves broken and about seven of them. Hemelytra smooth shining with a few appressed slender white hairs and more numerous stouter black hairs. Mesoepimeron slender, the osteole of the scent gland well before its tip with a tuft of hairs of moderate length. Metaxyphus moderately long and slender, its tip attaining the distal inner margin of the hind coxae. The front leg of the male lacks the carina on the caudal side of the tibia and the carina on the basal fourth of the pala. The tibia is not dorsally produced over the pala but has a distinct pad on its anterior distal margin. The pala is not notched on its dorsal margin and end less twisted than in H. nigra. (See drawing on Plate XVIII.) The middle leg — Femur : tibia : tarsus : claws : : 100 : 42.5 : 29 : 29; rather stout with strong spines, the tibia with some swimming hairs. Hind leg— Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 93.8 : 112 : 59.6; rather stout; only the base of femur pilose, its upper surface without spines, its lower surface with about 12 spines, tibia with stout spines on anterior and posterior margins and some swimming hairs; the tarsus with spines on anterior margin and swimming hairs on posterior margin. Male abdomen and genital claspers as shown on Plate XVIII. Comparative notes: This black shining little species is related to H. nigra Hungerford from which it differs in lacking any pale fig- ures on the pronotum or hemelytra, in lacking a carina on front tibia of male, but in having a distal pad on tibia. On the male abdomen the prestrigilar comb extends farther to the right of the strigil and consists of smaller teeth than in H. nigra. The strigil is broader and has a tuft of hairs extending from the right side over it. Both claspers of the genital capsule are quite different from those of H. nigra. (See Plate XVIII.) Location of types: Described from a series of 6 males, 38 females bearing the following labels: "Fern, S. A., October 24, 1935, F. Woytkowski. Field note 3556. Vic. Sani Beni, 840 m. above sea level. Muddy pool No. 1 in dark jungle." Holotype, allotype and paratypes in Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution : (Plate XX) Besides the above type series, we have in our collection the following: "Peru, S. A., May 15-19, 1935, F. Woytkowski, Vic. San Pedro, 900 m. above sea level. Pools and ponds." One male, 3 females. "Satipo, Peru, S. A., XI, 1942, Pedro Paprzyki." Ten males, 20 females. 126 The University Science Bulletin Heterocorixa nigra Himgerford (Plate XVIII, figs. 3, 3a-3c) 192S. Heterocorixa nigra Hungerford, H. B. Bull. Brooklyn Ent. Soc. XXIII, No. 2, p. 100, PI. Ill, figs. 4, S and 9. (Fig. 7 = H. boliviensis) 1928. Heterocorixa reinhardti Lundblad, O. Entomologisk Tidskrift, XLIX, Hiift 2, pp. 69-75, figs. 1 to 7. 1933. Heterocorixa reinhardti, Jaczewski, T. Annales Musei Zoologici Polonici IV, Nr. 21, p. 337 (Distr.) 1935. Heterocorixa reinhardti, Poisson, R. Archives de Zool. Exp. et Gen., LXXVII, p. 465. Size: Length 4.1 mm. to 4.84 mm.; width across head 1.47 mm. to 1.7 mm. Color: Nearly black. Head with a dark spot on the front of the vertex and the postocular area brown to black; pronotum dark brown to black with few or many pale irregular spots arranged in transverse series. Sometimes the clavus and base of corium with similar spots in .oblique series. Apex of clavus, most of corium and membrane of .right hemelytron brown to black; the membrane of left hemelytron white to transparent; the embolar groove frosty black. Legs brown to black save anterior femora. Thorax and ab- dominal venter brown to black. Structural characteristics: Head longer than the pronotal disk. Anterior margin of the head as shown on Plate XIX; postocular area broad, its surface along caudal margin wrinkled or coarsely rastrate; head with very faint median carina; facial impression of male shallow and transverse; facial hairs few, appressed; the rela- tive lengths of the finely haired antennal segments are as follows: 1 : 2 : 3 : 4 : : 20 : 12 : 22 : 18. Pronotal disk roughened. Hem- elytra smooth, shining with a few appressed slender hairs. Mesoe- pimeron slender, the osteole of the scent gland well before its tip and with a tuft of long hairs. Metaxyphus long and slender, its tip extending beyond the distal inner margin of the hind coxae. The front leg of the male has a small slender pala, deeply notched on its dorsal margin beyond which it is somewhat twisted. (See Plate XVHL) Doctor Lundblad figured a characteristic tuft of hairs on the rear of the femur near its base. This is present in about half the specimens of a given series. The tibia with an embrowned carina on its caudal side, dorsally produced over the base of the pala which is dorsally carinate on its basal one-fourth. The middle leg — Femur : tibia : tarsus : claws : : 100 : 45.5 : 29 : 29; rather stout with strong spines, the tibia with some swimming hairs. The hind leg — Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 85.'8 : Western Hemisphere Corixidae 127 101 : 51.5; rather stout; only the base of femur pilose, its upper sur- face without spines, its lower surface with about 7 spines ; tibia with stout spines on anterior and posterior margins and a few swimming hairs; the tarsus with spines on anterior margin and swimming hairs on posterior margin. Male abdomen as shown on Plate XVIII. Genital claspers as shown on Plate XVIII. Comparative notes: This nearly black shining little species has two close relatives, H. woytkowskii, which is also black, and H. chapadiensis, which is not. From the former the males may be dis- tinguished by the dorsal carina on the base of the pala, the deep constriction on its dorsal margin, the dorsal distal projection of the tibia and the lack of a tibial pad. From the latter by its darker color, shorter pronotal disk and its much more slender right clasper. Nomenclatorial notes: In 1928 both Lundblad and Hungerford, unknown to each other, described new species of Heterocorixa. In August of 1928 they compared their descriptions at Stockholm and decided their species were different. However, in 1939 Jaczewski, in correspondence, raised the question of synonymy of H. reinhardti with H. nigra and sent specimens he had determined as H. rein- hardti. A careful restudy disclosed that there was a mislabeling on Hungerford's Plate III. Figures 4 and 7 had been exchanged, and Lundblad's excellent description and drawings fit H. nigra Hun- gerford which unfortunately has priority. Location of types: Described from 2 males and 4 females taken at Sao Paulo, Brazil, by R. Spitz. Holotype, allotype and 4 para- types in the Francis Huntington Snow Entomological Collections, University of Kansas. Doctor Lundblad described H. reinhardti from a male and female in the Museum of Copenhagen which were collected in Rio de Janeiro by J. T. Reinhardt. Data on distribution: (Plate XX) Besides the types we have in our collections the following: Ypirango, St. Paulo, Brazil, R. Spitz, 1 male, 2 females; Sao Paulo, Aug. 7, 1927, E. D. Townsend, 5 fe- males; Estado de Sao Paulo, Nov., 1928, E. D. Townsend, 1 male, 5 females; Itaquaquecetuba, Brazil, March 22, 1933, N. 0. Town- send, 7 males, 3 females; Itaquaquecetuba, Brazil, July, 1933, N. 0. Townsend, 15 males, 14 females; Brazil, S. A., Sao Paulo, Aug. 18, 1928, T. Jaczewski, male and female (labeled H. reinhardti Lundb. by Jaczewski) ; State of Minas Geraes, Ouro Preto, Aug. 23, 1940, H. Kleerekoper, 2 females. We have seen also: S. Paulo, Aug., 1908, 1 male, 1 female (Carnegie Mus.) ; Ypirango bei Sao Paulo, Doctor L. Reh, leg. ded. VII, 17, 1896. 1 male. 1 female (Hamburg Mus.) 128 The University Science Bulletin PLATE XVI Heterocorixa B. White Fig. 1. Heterocorixa westermanni Lundblad; pala of male.* Fig. la. Dorsal view of male abdomen.* Fig. lb. Left clasper of male.* Fig. Ic. Right clasper of male.* Fig. Id. Strigil.* Fig. 2. Heterocorixa hmdbladi n. sp.; pala of male. Fig. 2a. Dorsal view of male abdomen. Fig. 2b. Left clasper. Fig. 2c. Right clasper. Fig. 3. Heterocorixa jaczewskii n. sp.; pala of male. Fig. 3a. Dorsal view of male abdomen. Fig. 3b. Left clasper. Fig. 3c. Right clasper. Fig. 4. Heterocorixa brasiliensis Hungerford; pala of male. Fig. 4a. Dorsal view of male abdomen. Fig. 4b. Left clasper. Fig. 4c. Right clasper. * These drawings taken from Lundblad. Western Hemisphere Corixidae 129 PLATE XVI 9—822 I3(j The University Science Bulletin PLATE XVII Heterocorixa B. White Fig. 1. Heterocorixa hesperia venezuelaria n. subsp.; pala of male. KiG. la. Dorsal view of male abdomen. I*'iG. lb. Left clasper of male. Fig. Ic. Right clasper of male. Fig. 2. Heterocorixa hintoni n.'sp.; pala of male. Fig. 2a. Dorsal view of male abdomen. Fig. 2b. Left clasper. Fig. 2c. Right clasper. Fig. 3. Heterocorixa wrighti olallai n. subsp.; pala of male. Fig. 3a. Dorsal view of male abdomen. Fig. 3b. Left clasper. Fig. 3c. Right clasper. Fig. 4. Heterocorixa wrighti n. sp.; pala of male. Fig. 4a. Dorsal view of male abdomen. Fig. 4b. Left clasper. Fig. 4c. Right clasper. Western Hemisphere Corixidae PLATE XVII J31 132 The University Science Bulletin PLATE XVIII Heterocorixa B. White Fig. 1. Heterocorixa woytkowskii n. sp.; dorsal view of male abdomen. Fig. la. Front leg of male. Fig. lb. Left clasper of male. Fig. Ic. Right clasper of male. Fig. 2. Heterocorixa chapadiensis Hungerford; dorsal view of male ab- domen. Fig. 2a. Front leg of male. Fig. 2b. Left clasper. Fig. 2c. Right clasper. Fig. 3. Heterocorixa nigra Hungerford; dorsal view of male abdomen. Fig. 3a. Front leg of male. Fig. 3b. Left clasper. Fig. 3c. Right clasper. Fig. 4. Heterocorixa williamsi Hungerford; dorsal view of male abdomen. Fig. 4a. Front leg of male. Fig. 4b. Left clasper. Fig. 4c. Right clasper. Fig. 5. Heterocorixa boliviensis Hungerford; dorsal \ie\v of male abdomen. Fig. 5a. Front leg of male. Fig. 5b. Left clasper. Fig. 5c. Right clasper Western Hemisphere Corixidae PLATE XVIII 133 4 H wiHiomn Hungfd 5 H bohviensis Hungfd 134 The University Science Bulletin Fig. 1. Fig. la. Fig. 2. Fig. 3. Fig. 4. Fig. 4a. Fia. 4b. Fig. 5. Fig. 6. Fig. 7. Fig. 8. Fig. 8a. Fig. 8b. Fig. 8c. Fig. 8d. Fig. 8e. Fig. 8f. PLATE XIX Heterocorixa B. White Heteroconxa hintoni n. sp.; head of male. Head of female. Heteroconxa nigra Hungerford; cephalic view of head. Sigara (Vermicorixa) alternata (Say); cephalic view of head. Heterocorixa braziliensis Hungerford; metaxyphus. Head of male. Head of female. Heterocorixa lundbladi n. sp.; metaxyphus. Heteroconxa hesperia B. White; metaxyphus. Heterocorixa jaczewskii n. sp.; metaxyphus. Heterocorixa anduzei n. sp.; middle femur of male Metaxyphus. Head of male. Right clasper of male. Left clasper of male. Pala of male. Dorsal view of male abdomen. Western Hemisphere Corixidae 135 PLATE XIX I H hinloni n sp 4. H brazilien$}$ 7 H laczewskii -'lifpoculor sutvrt 2 H nigra Hungfd 4o. - ^ *•• . ., _ II- ■ ii':' . I . . '*' -^ ^A-v -v' y y/v 8 H. ondu^eii " sp. 136 The University Science Bulletin PLATE XX EI H. LUNBLADI ^ H. JACZEWSKII V H. HINTONI tf ♦ ". WRIGHTI f H. WRIGHTI OLLALAI • HETEROCORIXA BRASIUENSIS m H. BOLIVIENSIS ^\ H. CHAPADIENSIS ® H HESPERIA A H. NIGRA Q H. ANDUZEI O H WILLI AMSI a H. HESPERIA VENZUELANA Western Hemisphere Corixidae . 137 CoRixiNAE Enderlein This subfamily contains the majority of the Corixidae. Rostrum with transverse sulcations. The hypo-ocular suture, when apparent, arising about midway along ventral margin of the eye. Pala of various shapes, with a well-developed palm. Scutel- lum covered by the pronotum or with only its tip exposed. Hem- elytra with embolar groove and well developed nodal furrow. Me- dia vein present through most of its length, usually midway between costal margin and cubitus and usually fused at its apex with cubitus. This subfamily contains four tribes. Key to Tribes of Subfamily Corixinae A. Eyes protuberant* with inner anterior angles broadly rounded. Face depressed in both sexes, densely covered with hair. Postocular space broad, head transversely depressed. Dorsal margin of the metathoracic episternum grooved. Lower palmar hairs on pala few (not more than 12 to 14), and long. (Type genus Glaenororisa) Glaenocorisini tribe now (Holarctic) See p. 137 AA. Eyes not protuberant (except in E. tumidacephala) and inner angles normal. Face of females usually not hairy nor depressed. Postocular space, if broad, with the head not transveisely depressed. Dorsal margin of metathoracic episternum usually not grooved. Lower palmar hairs on pala more than 14 or short. B. With rather thick, well developed apical claw on fore tarsus of both sexes; pala of both narrowly digitiform ; males with row of stout short pegs along upper edge of palm ; usually with a mat of hair-like setae on frons in both sexes. (Type genus Graptocorixa) Graptocorixini tribe new (Primarily Neotropic) p. 150 BB. AVith apical claw on fore tarsus spine-like, usually resembling the spines along lower margin of palm, pala not narrowly digitiform, of various shapes, male with row of pegs usually well above the fringe of setae along upper edge of palm, setae on frons not mat-like, often absent. C. Hemelytra and pronotum seldom concolorous ; pronotum always glab- rous ; hemelytra often showmg scattered short or long setae, frequently both; vein M. fusing witli Cu. at base of nodal furrow or sometimes ob- solete at apex. (Type genus Corixa) Corixini Walton 1940 (World wide) p. 197 CC. Hemelytra and pronotum concolorous, sometmies with dark spots at base of each of the short hair-like setae which form a uniform pubescence over both; pala of sexes much alike; vein M fuses with Cu. before the nodal furrow a distance equal to or greater than length of latter (Type genus A graptocorixa) Agraptocorixini tribe new (Ethopian- Australasian) Tribe Glaenocorisini new The two genera we have assigned to this tribe are boreal in dis- tribution and may be separated as follows: Key to Genera A. Pronotum and clavus strongly rastrate. Mesosternum not medianly produced. Male pala dorsally expanded at base. Female with lateral hair tufts on last ven- tral abdominal segment which is not incised at tip Glaenocorisa Thomson * Surface more convexly rounded than normal. 138 The University Science Bulletin AA. Pionotum and clavus not strongly rastrate. Mesostemum medianly produced. Male pala not dorsally expanded at base. Female without definite lateral hair tufta OD last ventral abdominal segment; if haiiy, then incised at tip Dasycorixa n. gen. Glaenocorisa Thomson (Wash drawing No. 35, Plate VI) 1869. Thomson, C. G. Ofversigt af Sveriges Coriser. Opuscula Entomologica, p. 39, (as subg. of Corixa for his C. cavifrons). 1&73. White, F. Buchanan. Ent. Mo. Magazine, Vol. 10, p. 63, (proposes Oreinocorixa as genus for C. alpestris D and S, now a synonym of G. cavifrons Thomson). 18'92. Saunders, Edward. The Hemiptera Heteroptera of the British Islands, p. 341, (his subg. Oreinocorixa White but not his Glaenocorisa Thoms.). 1894. Wallengren, H. D. J. Entomol. Tidskr., Arg. 15, H. 2, I, p. 670 (as subg. of Corisa). 1901-1903. Kirkaldy, G. W. Jl. of the Quekett Microscopical Club, Second Sen VIII, pp. 33-46 (gives Glaenocorisa Thomson as subg. of Corixa Geoffrey and Oreinocorixa White as syn.). 1909. Oshanin, B. Verzeichnis der Palaearktischen Hemipteren, Vol. I, p. 996 (as genus). 1912. Oshanin, B. Katalog der Palaarktischen Hemipteren, p. 92, (as genus). 1924. Jaczewski, T. Annates Zoologici Musei Polonici Historiae Naturalis, III, p. 23. 1928. Jaczewski, T. Annales Musei Zoologici Polonici, VII, pp. 49, 53-56, (geog. dist.). 1930. Jones, H. P. Entomologist's Record, XL-XLII ; reprint, p. 77. 1935. Poisson, R. Archives de Zoologie Experimentale et Generale, LXXVII, pp. 457 and 459, (would consider G. cavifrons Thoms. as a Sigara with primitive characters). 1935. Stichel, Wolfgang. lUustrierte Bestimmungstabellen der Deutschen Wanzen, Lief 11, p. 312. 1938. China, W. E. The Ent. Mo. Magazine, LXXIV, p. 39. 1939. Macan, T. T. Freshwater Biological Association of the British Empire, Scientific Publ. No. 1, pp. 7 and 17. 1943. China, W. E. The Generic Names of British Insects, Pt. 8, p. 283. 1944. Hungerford, H. B. Bull. Brooklyn Ent. Soc., XXXIX, No. 1, pp. 32-34 (syn. notes). 1946. Brown, E. S. Trans. Roy. Ent. Soc. London, XCVI, Pt. 1, pp. 1-10, 1 pi. (Con- cludes that G. propiiiqua propinqtia [light form] and G. propinqua cavifrons [dark form] are the same species.) Medium-sizeci corixids with protuberant eyes; the head trans- versely depressed between the medio-posterior angles of the eyes; postocular space broad especially at inner angle of the eyes with the margin more or less upturned; front flattened in female to con- cave in male and densely covered with long white hairs. Pronotum with a prominent median carina extending beyond the middle, a faint to distinct ridge on the anterior and lateral margin of the pigmented field; lateral lobe of pronotum elongate, obliquely trun- cate, its anterior angle produced. Pronotum and clavus strongly rastrate. Metaxyphus an equilateral triangle. Pala with not more than a dozen or fourteen long bristles on lower margin. Male pala carinate on outside and inner surface crossed by an oblique ndge beyond which the pegs are bristlelike (see Plate XXI, figs, la and 2). Anterior tibia short with several long bristles on inner side,, dorsally carinate in the male. Anterior femur with lower margin sharp edged in both sexes and expanded in the male. Ventral sur- face of hind femur shining, the pilose area restricted to the base. Western Hemisphere Corixidae 139 Female with last ventral abdominal segment broadly expanded in the middle, not incised, a patch of hairs on either side near the base. Male strigil dextral. Genotype: G. cavifrons Thomson, now called G. propinqua (Fieber). A genus of only two or three species. Glaenocorixa hybrida Hun- gerford belongs elsewhere, and Glaenocorixa hugoscotti Hutchinson has been assigned to Pseudoglaenocorisa by Jaczewski. The genus is northern in distribution and Jaczewski, 1928, says of G. cavifrons "it shows itself in the so-called glacial relics of Europe." Glaenocorisa quadrata Walley (Plate XXI, figs. 1, la-lb) 1930. Glaenocorisa quadrata Walley, G. S. Can. Ent., LXII, pp. 80-81, pi. 10, figs. 10-13. 1944. Glaenocorisa quadrata, Hungerford, H. B. Bull. Brookl. Ent. Soc, XXXIX, pp 32-33. (Dist.) Size: Length 8 mm. to 9.66 mm.; width across head 2.35 mm. to 2.56 mm. Color: General facies dark. Pattern similar to that of G. propin- qua (Fieber). Head above brownish; face yellowish, suffused with brown. Pronotum brownish black with 9 to 10 slightly confused dirty yellowish cross lines. Clavus with a few irregular pale bars on basal third, separated by much broader black spaces, beyond with interrupted transverse flecks. Corium and membrane with scattered yellowish flecks which do not form rows or series, the blackish ground color predominant. Venter blackish, the abdominal sternites narrowly pale at apices. Structural characteristics: Head as seen from above three-arched as in G. propinqua (Fieber) frontal depression of male deep, of fe- male flattened, densely covered with hair in both sexes. Antennal segments: 1 : 2 : 3 : 4 : : 28 : 20 : 55 : 25. The interocular space a little broader than the width of the eye measured in projection; postocular space rather broad. Prothoracic lateral lobe elongate, obliquely truncate at apex. Pronotum, clavus and base of corium rastrate. Front leg of male as shown on Plate XXI, figure la. The ventral margin of femur sharp edged in both sexes. The middle leg: femur : tibia : tarsus : claws : : 100 : 47.3 : 39.9 : 31.5. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 92.5 : 129.5 : 46.3. Metaxyphus in shape of an equilateral triangle. The male genital capsule and abdominal dorsum as shown on Plate XXI, figures 1 and lb. 140 The University Science Bulletin Location of types: In the Canadian National Collection, Ottawa. Holotype male and allotype female from Harrington Harbor, Que- bec, July 3, 1929, W. J. Brown. Paratypes female, Mecatina Sanc- tuary, Quebec, July 9, 1929; female. Bonne Esperance, Quebec, July 14, 1929; female, Bradore Bay, Quebec, July 27, 1929, collected by W. J. Brown. Comparative notes: This species appears on the whole a little larger than G. propinqua (Fieb.). It has a broader prothoracic lateral lobe. The male pala is relatively broader and the peg row reaches the dorsal margin. The differences in the abdominal dor- sum and in the right claspers are shown on Plate XXI. Data on distribution: (Plate XXIII) We have in the Francis Huntington Snow Collections at the University of Kansas the fol- lowing: Canada: Bradore Bay, Quebec, July 11, 1930, W. J. Brown, 1 male; same place, July 6, 1930, 1 female; Aklavik, N. W. T., Aug. 25, 1931, Bryant Lot 254, 1 female; same place, Aug. 27, 1931, Bryant Lot 257, 1 male; same place, July 25, 1931, Bryant Lot X, 1 male; Newfoundland, Trinity Goose Cove, Doctor E. Hentschel, July 13, 1910; from Hamburg Mus., 1 male. Europe: Aal, Norway, Strand, 1 male, 1 female. PLATE XXI Glaenoconsa Thomson Fig. 1. Glaenoconsa quadrata Walley; genital capsule of male. Fig. la. Pala of male. Fig. lb. Dorsal view of male abdomen. Fig. 2. Glaenoconsa propinqua (Fieber)*; pala of male. Fig. 2a. Genital capsule of male. Fig. 2b. Dorsal view of male abdomen. * Brown, E. S. (1946), concludes that G. propinqua propinqua (FieVier) and G. propinqua tarifroris Thomson are the same species. Western Hemisphere Corixidae 141 PLATE XXI 142 The University Science Bulletin Dasycarixa new genus This genus resembles Glaenocorisa Thompson in having the sur- face of the eyes more convexly rounded than normal, with their inner anterior angles broadly rounded ; in having the face depressed in both sexes and densely covered with hair; in having the post- ocular space broad and the head transversely depressed; in having the dorsal margin of the metaepisternum somewhat grooved; in having the lower palmar hairs of the pala few and long; in having the lateral lobe of the prothorax elongate, its base broader than its tip with the anterior distal angle turned inward. It differs from Glaenocorisa Thomson in not being strongly rastrate on pronotum and hemelytra and the latter more hairy ; in having a weaker, more slender metaxyphus; in having the male palar pegs uniform and not some of them spine-like ; the shape of the male pala elongate with much less developed longitudinal carina on the outside ; the anterior tibia of the male without the distal pad, and the last ventral ab- dominal segment of the female lacking the definite hair tufts and definitely incised at apex in two of the three species. Genotype: Glaenocorisa hybrida Hungerford. Key to Species of Dasycorixa 1. Small species, less than 8 mm. long D. johanseni (Walley) (p. 142) Larger species, average more than 8 mm. long 2 2. Seventh ventral abdominal segment of female not notched at apex ; seventh dorsal abdominal segment of male with median lobe small and barely discernible. D. hybrida (Hungerford) (p. 144) Seventh ventral abdominal segment of female notched at apex ; se\enth dorsal ab- dominal segment of male with median lobe large and triangular. .D. rawsoni n. ep. (p. 145) Dasycorixa johanseni (Walley) (Plate XXII, figs. 3, 3a and 3b) 1931. Arctocorixa johanseni Walley, G. S. Can. Ent., LXIII, No. 10, pp. 238-239, text figs. 1-5 (desc. from Man., Canada). Size: Length 6 mm. to 7+ mm. Width of head across eyes 2 mm. to 2.1 mm. General shape rather stout and compact. Color: General facies medium brown. Pronotum crossed by eight or nine narrow, irregular dark lines; clavus and corium with dark and light in about equal proportions, markings reticulate; pattern continuous over membrane; embolium, head, and limbs pale; venter smoky. Structural characteristics: Head about three-fourths as long as Western Hemisphere Corixidae 143 pronotal disk; vertex slightly produced as seen from above; inter- ocular space greater than width of an eye; eyes rather prominent; postocular space broad at inner angles of eyes but narrowing laterally; male fovea broadly oval, attaining eye margins, and fairly deep; face of female flattened and faces of both sexes covered with long, pale hairs; antennal segmentation: 1 : 2 : 3 : 4 : : 20 : 16 : 42 : 20 ^ ; 1 : 2 : 3 : 4 : : 20 : 16 : 45 : 22 5 . Pronotal disk with median carina plainly visible for one-third its length; disk about twice as broad as long, rounded apically; pronotum finely rastrate, hemelytra somewhat rugulose and covered with long, pale hairs; pruinose area of embolar groove posterior to the nodal furrow equal in length to that of claval suture, though both are short. Lateral lobe of prothorax narrow, longer than broad, narrower at apex than at base ; mesoepimeron at level of scent gland osteole about half the width of the lateral prothoracic lobe; osteole near tip of mesoepi- meron; metaxyphus small, narrow, acutely pointed at tip. Front leg of female of usual shape. Front leg of male pala — long and slender, 32 pegs in single, slightly curving, unbroken row; tibia longer than broad, two strong setae inwardly, dorsal carina not thin, extending from base to apex; femur moderately broad, about eight rows of stridulatory pegs on inner surface. Middle and hind legs slender, the proportions of segment to segment as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 46.3 : 32.5 : 32.5. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 90.8 : 124.9 : 52.2. Male asymmetry dextral; strigil small, oval, of 5 regular combs. Male pala, abdomen and genitalia as on Plate XXII, figs. 3, 3a and 3b. Seventh ventral abdominal segment of female broadly notched at apex. Comparative notes: This species by its smaller size is easily sep- arated from the other two species in the genus. Location of types: Holotype male. No. 3244, allotype female, and some paratypes labeled "Fort Churchill, Man., Oct. 23, 1929, F. Johansen," in the Canadian National Collection, Ottawa, Ontario. Two male and two female paratypes, same collection and data as above, in the Francis Huntington Snow Entomological Collections, University of Kansas. Other paratypes in the private collection of Mr. J. R. de la Torre-Bueno. Data on distribution: (Plate XXIII) Known only by the type series. 144 The University Science Bulletin Dasycorixa hyhrida (Hungerford) (Plate XXII, fis. 1, la and lb; wash drawing No. 43, PI. VII) 1926. Glaenocorixa hybrida Hungerford, H. B. Can. Ent., LVIII, p. 271, PI. figs. 3 and 6 (desc. from Minn.). 1930. Glaenocorixa hyhrida, Hutchinson, G. E. Proc. Zool. Soc. London, XXIX, Pt. 2, )). 4t51 (doubts that hybrida is congeneric with cavifrons and hugoscotti). 1935. Glaenocorixa hybrida, Poisson, R. Archives de Zool. Exp. et Gen., LXXVII, p. 459. Size: Length 7.6 mm. to 9.2 mm. Width of head across eyes 2.6 mm. to 2.8 mm. General shape rather stout and compact. Color: General facies medium to dark brown. Pronotum crossed by nine somewhat irregular dark bands, a little narrower or equal to the pale interspaces. Color pattern of hemelytra consisting of broken, irregular zigzag patches of dark and light intermingled; pale pattern on basal half of corium arranged in somewhat longitudinal series; dark pigment tending to coalesce on inner distal angle of corium. ]\Iembrane separated from corium by a pale line; mem- branal pattern pale and reticulate. Embolium, limbs, and thoracic venter pale ; head and abdominal venter smoky to black. Structural characteristics: Eyes prominent and remote from rear margin of head which is produced to a distinct angle in the middle ; head two-thirds as long as pronotal disk; interocular space a little wider than width of an eye measured in projection; vertex rounded out beyond eye margins in both sexes; face short, flattened in both sexes, and covered with long, light hairs; male fovea deep and broad, attaining eye margins; antennal segmentation: 1 : 2 : 3 : 4 : : 20 : 19 : 41 : 20 5 . Pronotal disk with median carina plainly visible on anterior third; pronotal disk with lateral margin carinate, rounded apically; pronotum finely rastrate, hemelytra lightly rugu- lose and shining, with pale hairs on corium and membrane; pruinose area of embolar groove posterior to nodal furrow equal in length to that of the claval suture. Lateral lobe of prothorax elongate, broader at base than at tip, sides tapering slightly, anterior distal angle produced and turned inward; mesoepimeron narrow with os- teole near the tip; metaxyphus long, narrow, and acutely pointed. Pala slender in both sexes, though broader than in Cymatia. Male pala with 33 pegs in a single, unbroken row; tibia about one-third as long as pala, two setae inwardly, with a dorsal carina and no pad ; femur relatively stout, broadest at base, with about 8 rows of stridulatory teeth on inner surface. Middle and hind legs relatively slender, the segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 49.4 : 36.8 : 31.5. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 100 : 123.5 : 49. Male asym- Western Hemisphere Corixidae 145 metry dextral; strigil fairly small, suboval, of 9 regular combs. Right clasper broadest on basal portion, tapering distally; tip not bifurcate. For details of male pala, abdomen, and genitalia see Plate XXII, figs. 1, la and lb. Female with seventh ventral ab- dominal segment sinuous across tip. Comparative notes: This species, which I described as a Glaeno- corisa, belongs with two other species in a new genus. From them it is separated by the key above. Location of types: Described from holotype male labeled ''St. Louis Co., Minn., Aug. 14, 1922, Babbit, H. B. Hungerford." Allo- type female, "Golf Club Pond, St. Paul, Minn., July 28, 1921, H. B. Hungerford." Both are in the Francis Huntington Snow Entomo- logical Collections, University of Kansas. Data on distribution: (Plate XXIII). U. S. A.: Minnesota: St. Louis, Co., Aug. 14, 1922, H. B. Hunger- ford, 1 male (holotype) ; St. Paul, golf pond, July 28, 1921, same collector, 1 female (allotype). Canada: British Columbia: Vernon, Dec, 1908, 1 male, 2 females (Parshley). Dasycorixa rawsoni n. sp. (Plate XXII, figs. 2, 2a and 2b) Size: Length 6.97 mm. to 9.4 mm. Width of head across eyes 2.3 to 2.7 mm. General shape rather long and slender. Color: General facies light. Pronotum crossed by 13 to 14 very narrow, irregular dark lines. Hemelytral pattern of wavy dark lines, much broken, and covering considerably less space than pale areas. On corium the pale areas arranged in 3 or 4 faintly longi- tudinal lines. Pattern continuous over membrane, though in some specimens a brownish line marks point of separation. Embolium, head, and limbs pale. Thoracic venter pale, abdominal venter pale to smoky. Structural characteristics: Head two-thirds as long as pronotal disk; interocular space a little wider than width of an eye; post- ocular area broad at inner angles of eyes, narrowing laterally; vertex projecting beyond eye margins in both sexes, as seen from above; faces of both sexes covered with long hairs; female face flattened, male concave; male fovea deep and broad, attaining eye margins laterally and extending dorsally almost to margin of vertex; an- tennal segmentation as follows: 1 : 2 : 3 : 4 : : 25 : 20 : 53 : 23 ^ ; 10—822 146 The University Science Bulleti N PLATE XXII Dasycorixa new genus Fig. 1. Dasycorixa hybrida (Hungerford) ; front leg of male. Fig. la. Dorsal view of male abdomen. Fig. lb. Genital capsule of male. Fig. 2. Dasycorixa rawsoni n. sp.; front leg of male. Fig. 2a. Dorsal view of male abdomen. Fig. 2b. Genital capsule of male. Fig. 3. Dasycorixa johanseni (Walley) ; front leg of male. Fig. 3a. Dorsal view of male abdomen. Fig. 3b. Genital capsule of male. Western Hemisphere Corixidae 147 PLATE XXII 148 The University Science Bulletin 1 : 2 : 3 : 4 : : 24 : 22 : 57 : 25 $ . Pronotal disk with median carina plainly visible on anterior half and usually discernible throughout, disk rather pointed apically; pronotum faintly rastrate and hemelytra somewhat rugulose, the latter with a few long, pale hairs ; piniinose area of embolar groove posterior to the nodal furrow equal in length to that of the claval suture. Lateral lobe of the pro- thorax elongate, a little broader at base than at tip; mesoepimeron narrow with osteole near the tip, width at level of osteole about two- thirds that of prothoracic lobe; metaxyphus as broad at base as long, but abruptly narrowed for most of its length and pointed. Front leg of female of usual shape, tibia with 3 strong setae. Front leg of male: pala elongate, about four times as long as broad, with 38 pegs in a single, unbroken, slightly curving row; tibia not quite half as long as pala, pronounced, though not narrow, dorsal carina with 3 strong setae on inner surface as in female; femur relatively stout, broadest across base, the lower edge rather sharp and with about 10 rows of stridulatory pegs on inner surface. Middle and hind legs slender, the proportion of segment to segment as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 51 : 38.9 : 38.9. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 100 : 136 : 50. Male asymmetry dextral; strigil large, suboval, of 14 to 15 iri:egular combs. Median lobe of seventh abdominal segment large and al- most triangular; right lobe of same segment with a projection near juncture with sixth segment, to the right of the strigil. For details of male pala, abdomen, and genitalia see Plate XXII, figs. 2, 2a and 2b. Seventh ventral abdominal segment of female notched at tip. Comparative notes: In color pattern this species is more like D. johanseni (Walley) than D. hybrida (Hungerford) from which it is distinguished by the key. Location of types: Holotype male, allotype female, and 1 female paratype labeled "S. Saskatchewan, Can., Lizard Lake, Aug. 10, 1938, D. S. Rawson;" also 2 male and 3 female paratypes labeled ''S. Saskatchewan, Can., Antelope Lake, July 31, 1938, D. S. Raw- son" in the Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate XXIII) Besides the type series we have the following: S. Saskatchewan: Loon Lake, June 14, 1939, J. E. Moore, 4 males, 3 females; Birch Lake, June 15, 1939, J. E. Moore, 3 females. Western Hemisphere Corixidae 149 PLATE XXIII NEOCORIXA SNOWI X__2?J " u OlfTA ~ 150 The University Science Bulletin Tribe Graptocorixini new This tribe contains two genera, both from the western United States and Mexico. They may be separated by the following key: A. Male abdomen sinistral, strigil absent. Female abdomen slightly asymmetrical. Face of female slightly concave Neocorira Hungerford (See p. 150) AA. Male abdomen dextral, strigil present. Female face not concave and abdomen normal Graptocorixa Hungerford (See p. 156) Neocorixa Hungerford 1925. Hungerford, H. B. Bull. Brooklyn Ent. Soc. XX, No. 1, pp. 19-20. 1927. Poisson, R. Bull, de la Societe Entomologique de France, 1927, pp. 74-75. (As- .signed A. vermiculata (Put.) to this genus in error.) 1928. Hungerford, H. B. Annals Ent. Soc. Amer., XXI, p. 141. 1928. Jaczewski, T. Annales Musei Zoologici Polonici VII, pp. 59-61. 1935. Poisson, R. Archiv. de Zool. Exp. et Gen., LXXVII, p. 457. 1938. Hungerford, H. B. Bull. Brooklyn Ent. Soc, XXXIII, pp. 170-171. 1940. Hutchinson, G. E. Trans. Conn. Acad. Arts and Sciences, XXXIII, p. 404. (Places Neocorixa in the tribe Csonatiini Walton along with Cymatia.) This genus has the general facies of Graptocorixa. The pala in_ both sexes is slender, falcate and ends in a stout claw. The face is short and broad, the frontal fovea marked and covered with a dense mat of hair in both sexes. The lateral lobe of the prothorax has the anterior distal angle produced and turned in. Mesosternum me- dianly bidentately produced. Hind femur pilose only at the base and along the caudal margin, its ventral shining surface with forty or more small peg-like spines, irregularly spaced. The asymmetry of the male sinistral. True strigil absent. The female abdomen also definitely asymmetrical due to a depression on the right side of the fifth ventral and a tuft of hair on the sixth behind it. Genotype: Neocorixa snowi Hungerford. Distribution: Southwestern United States and Mexico. Neocorixa snowi Hungerford (Plate XXIV, figs. 1, 2, 5, and 7; wash drawing No. 37, Plate VI) 1925. Neocorixa snowi Hungerford, H. B. Bull. Brooklyn Ent. Soc, XX, pp. 19-20, PI. II, fig. 8. (New genus, new sp. from Arizona.) 1928. Neocorixa snowi, Hungerford, H. B. Ent. News XXXIX, p. 156. (Record from New Mexico.) 1928. Neocorixa s^nowi, Hungerford, H. B., Annals Ent. Soc. Amer.. XXI, p. 141, PI. VIII, fig. 13. 1935. Neocorixa snowi, Poisson, R. Archiv. de Zool. Exp. et Gen., LXXVII, p. 457. 1938. Neocorixa snowi, Hungerford, H. B. Pan-Pacific Ent. XIV, p. 76. (Record from Mexico.) 1938. Neocorixa snowi, Hungerford, H. B. Bull. Brooklyn Ent. Soc, XXXIII, pp. 170- 171, PI. VII, figs. 1, 2, 5, 7. Size: Length 6.9 mm. to 8.2 mm. Width across head 2.3 mm. to 2.6 mm. Western Hemisphere Corixidae 151 Color: General color usually dark, both dorsum and venter. Head and legs ivory to yellow, the second segment of hind tarsus brown. Pale patches on the sides of each thoracic segment, the mesothoracic epimeron usually suffused with black. Pronotum usually crossed by fourteen or more slender, more or less broken and anastomosing black bands which are about as wide as the intermediate pale bands. Except at the base of the clavus, the pale finely zigzag lines are narrower than the dark ones and the sculpturing of the hemeltyra is such that they appear as elevated across ridges; the slender pale lines of the membrane are more or less broken, but nevertheless give a crossbar effect. In many specimens the pattern of both clavus and corium is obscured by dark brown; nodal furrow covered by a large sooty blotch. Structural characteristics: The so-called beak reducec}. Frontal depression of male oval, not reaching the eyes; this area in both sexes densely clothed with fine white hairs. The relative length of the antennai segments 1 : 2 : 3 : 4 : : 30 : 20 : 42 : 15. The pro- notum and hemelytra somewhat roughened, the latter more or less rugulose, a few fine hairs on corium; the pruinose area of embolar groove posterior to nodal furrow : cubital ridge as 10 : 21 and a little longer than the pruinose area of the claval fold. Mesoepimeron slender with the osteole of the scent gland near its tip. The meta- xyphus nearly as long as the inner margin of the hind coxa. Lower margin of the basal half of front femur provided with a few strong spines; the tibia with several stout spines, the pala long, slender, tapering to a single stout claw in both sexes; the male pala provided with about thirty-two pegs arranged in a row just above the palm. The middle leg — femur : tibia : tarsus : claws : : 100 : 40 : 37 : 23. The hind leg — femur : tibia : tarsus 1 : tarsus 2 : : 100 : 97 : 125 : 45. The asymmetry of the male sinistral, a curious patch of short hook-like projections on the left side of the sixth dorsal abdominal tergite. The genital capsule of male as shown on Plate XXIV. The last ventral abdominal segment of female not rectangularly pro- duced, and the notch on the inner ventral margin of the anal lobes deep. (See Plate XXIV.) Comparative notes: This species has the general facies of some of the Graptocorixa species and the palae of the front legs are similar but it differs from any of them in having the male abdomen sinistral with a patch of short hooks replacing a strigil and the female ab- domen also showing asymmetry. Location of types: Described from 4 males and 4 females bearing 152 The University Science Bulletin the label ''Santa Rita Mts., Ariz., 5 to 8,000 ft., June, F. H. Snow." Holotype, allotype and paratypes in Francis Huntington Snow Col- lection, University of Kansas. Data on distribution: (Plate XXIII) We have, besides the types, the following before us: U. S. A.: Arizona: Santa Catalina Mts., Dec. 21, 1935, Bryant (Bryant) ; Tucson, Jan. 27, 1935, Bryant (Bryant) ; Gila Co., Aug. 5, 1927, L. D. Anderson, P. A. Readio, R. H. Beamer, 53 males, 78 females; Sierra Ancha Mts., Gila Co., Duncan (Lutz) ; Santa Rita Mts., July 17, 1932, R. H. Beamer, 6 females; Huachuca Mts., July 8 1932, R. H. Beamer, 2 females; Chiricahua Mts., July 8, 1932, R. H Beamer, 1 male, 4 females; same place, July 5, 1940, L. C. Kuitert, 1 male, 4 females; same place, Rustler's Park, 8,000-8,500 ft., June 16, 1932, Duncan (Lutz) ; Coconimo Co., General Springs, Aug. 29 1935, I. J. Cantrall (Mich.), 3 males, 4 females. New Mexico: Torrance Co., July, 1925, C. H. Martin, 5 males, 7 females; Silver City, July 22, 1936, M. B. Jackson, 15 males, 17 females, 3 nymphs; Lordsburg, July 16, 1937, H. Ruckes (Lutz). Mexico: Chiapas: Lake Tepancu^pan, Aug. 29, 1937, H. D. Thomas, 9 males, 14 females. Veracruz: Orizaba, July 30, 1937, H. D. Thomas, 2 females. Michoacdn: Morelia, Sept. 4, 1938, H. D. Thomas, 1 male, 2 females; near L. Cuitzeo, Aug. 10, 1932, Hobart Smith, 3 males, 1 female; Tancitaro, July 8, 1940, F. Schacht, 20 males, 8 females in permanent pool. Jalisco: Tecolotlan, Sept. 17, 1938, H. D. Thomas, 1 male. Sonora: Tepopa, S. Charibo, March 9, 1935, H. S. Gentry, 1 fe- male. Guanajuato: near Santa Rosa, Aug. 14, 1932, Hobart Smith, 1 male. San Luis Potosi: Aug. 5, 1944, H. D. Thomas, 1 male, 1 female. Coahuila: Saltillo, Sept. 10, 1937, H. D. Thomas, 8 males, 12 females. Hidalgo: San Antonio near El Salto, 5,000 ft. above sea level, semitropical, June 10, 1937, Meldon Embury, 11 males, 3 females; same place at 9.300 ft. in Pine Forest, June 5, 1937, Meldon Em- bury, 1 male; El Chico Nat. Park, 9,000 ft., Aug. 2, 1938, Ed Taylor, 2 females; El Chico, Sept. 23, 1938, H. D. Thomas, in rapid clear stream, 11 males, 8 females. Western Hemisphere Corixidae 153 Puebla: Puebla, July 24, 1937, H. D. Thomas, 2 females; Aug. 16, 1937, 1 male, 2 females. Mexico: Tejupilco, Temescaltepec, June 24, 1933, Hinton and Usinger (Calif. Acad.) ; Real de Arriba, Dist. of Temascaltepec, Alt. 1960 meters, May, June, 1933, H. E. Hinton, 49 males, 70 females; 12 miles west of Villa Victoria, Mar. 23, 1939, H. Smith, Alt. 2,560 meters, 1 male, 2 females. Mr. Henry Thomas records on one label taking this species "in a rapid clear stream" and F. Schacht took it "in a permanent pool." Elevations that have been given range from 5,00Q feet to 9,300 feet. Neocorixa picta Hungerford (Plate XXIV, figs. 3, i, 6 and 8) 1938. Neocorixa picta Hungerford, H. B. Bull. Brooklyn Ent. Soc. XXXIII, pp. 170- 172, PI. VII, figs. 3, 4, 6, 8. Size: Length 7.9 mm. to 8.5 mm.; width of head 2.6 mm. to 2.8 mm. • Color: General color dark, both dorsum and venter, but slightly lighter than in Neocorixa snowi Hungerford because of the much coarser barring on the pronotum and hemelytra and an extension of the pale areas on the venter. The mesothoracic epimeron, for exam- ple, is light in color, whereas in A^. snowi it is usually suffused with black. Head and legs yellowish to ivory; the second segment of hind tarsus embrowned. Pronotum crossed by about a dozen slen- der, much broken and anastomosing black bands. The zigzag banding of the hemelytra coarse, the pale bands, on the whole, as broad at least as the black, the pattern continuing uninterrupted on the membrane. Structural characteristics : The so-called beak reduced. Frontal depression of male broadly oval, not reaching the eyes; this area in both sexes densely clothed with fine white hairs. The relative length of the antennal segments— 1 : 2 : 3 : 4 : : 28 : 20 : 46 : 13. The pronotum and hemelytra somewhat roughened, the latter more or less rugulose, a few fine hairs on the corium; the pruinosc area of embolar groove posterior to nodal furrow: cubital ridge as 12 : 26, and a little longer than the pruinose area of the claval fold. Meso- epimeron slender with the osteole of the scent gland near its tip. The metaxyphus nearly as long as inner margin of hind coxa. Lower margin of the basal half of front femur provided with a few strong spines; the tibia with several stout spines; the pala long, slender, tapering to a single stout claw in both sexes ; the male pala provided 154 The University Science Bulletin with about forty-four pegs arranged in a row just above the palm. The middle leg — femur : tibia : tarsus : claws : : 100 : 37.5 : 32.5 : 30. The hind leg — femur : tibia : tarsus 1 : tarsus 2 : : 100 : 94.3 : 122 : 35.5. The asymmetry of the male sinistral but no strigil or patch of short hook-like projections. The genital capsule of male as shown on Plate XXIV. The last ventral abdominal segment of female rectangularly produced as shown in the drawing, and the notch on the inner ventral margin of the anal lobes shallow. (See Plate XXIV.) Comparative notes: This species is distinguished from N. snowi Hungerford by the broad pale bands in the zigzag pattern of the hemelytra, by the shape of the genital clasper, the lack of the "stridular" patch of hooks in the male and by the shape of the last ventral abdominal segment and the anal lobes in the female. See the drawings on Plate XXIV. Location of types: Described from 67 specimens (24 males and 43 females) bearing the label "San Cristobal, Chiapas, Mexico, Sept. 2, 1937, H. D. Thomas." These are in the Francis Huntington Snow Collections, University of Kansas. Data on distribution: (Plate XXIII) Besides the type series, we have the following: "Ciudad Las Casas, Pocito, Mex., Sept. 4, 1937, H. D. Thomas," 6 males, 6 females. This is also in Chiapas. PLATE XXIV Neocorixa Hungerford Fig. 1. Neocorixa snowi Hungerford; genital capsule of male. Fig. 2. A'^. snowi Hungerford; pala of male. Fig. 3. Neocorixa picla Hungerford; pala of male. Fig. 4. A'^. picla Hungerford; genital capsule of male. Fig. 5. A'^. snowi Hungerford; dorsal view of male abdomen. Fig. 6. N. picta Hungerford; dorsal view of male abdomen. Fig. 7. A^. snowi Hungerford; ventral view of female abdomen. Fig. 8. A^. picla Hungerford; ventral view of female abdomen. Western Hemisphere Corixidae 155 PLATE XXIV I N.snowi 4 N. picta 5 N snowi 6 N picta 7 N snowi 8. N picta 156 The University Science Bulletin The Genus Graptocorixa Hungerford 1930. Hungerford, H. B. Pan-Pacific Entomologist \'II, pp. 22-23 [Genotype Corixa abdominalis (Say)l. 1931. Jaczewski, T. Annales Musei Zoologici Polonici, IX, pp. 191-194. 1935. Poisson, R. Archives de Zoologie Experinientale at Generale, LXXVII, p. 458. 1943. Walton, G. A. Trans. Soc. for British Entomology, VIII, p. 157. (As subg. of Trichocorixa Kirk.) Surface of hemelytra rastrate or roughly rugulose, transversely marked with charactertistic undulate bands. Membranal line not marked, usually indistinct. Margin of hemelytra beyond embolar furrow maculated. Pruinose ar'ea on claval fold along clavus usually less than twice the distance between the shining basal apices of the corium and clavus. Face more or less hairy, often densely so, face usually reduced. Infraocular portion of head often very broad and postocular area moderately ,wide. Legs comparatively short and stout. Pala typically digitiform with well developed claw, which is often stout. The male pala with a row of pegs adjacent to the upper margin of the palm. Dorsum of abdomen often red. Male strigil dextral. Genotype: Corixa abdominalis Say. Comparative notes: The color pattern and the shape of the palae are distinctive. The only other genus having these characters is Neocorixa in which the male abdomen is sinistral and the female abdomen shows distinct asymmetry. Distribution: This genus occurs in the western United States and southward to Costa Rica. Key to Graptocorixa Hungerford 1. Middle tarsus longer than its tibia, on moderately large or broad species with head width at least 2.6 mm • 2 Middle tarsus subequal to tibia ; if longer, then on small, rather slender, species. 4 2. (1) Prothoracic lateral lobe broader than long. Postocular space narrow. Distal half of rear margin of hind femur of the male with a close set row of stout pegs G. ruina Hungerford (p. 158) Prothoracic lateral lobe not broader than long. Postocular space fairly broad. Hind femur of male not as above ;■; 3. (2) Prothoracic lateral lobe considerably longer than broad, the anterior distal angle almost acute O. robusta Hungerford (p. 159) Prothoracic lateral lobe but little longer than broad, the anterior distal angle rounded G. thotnasi Hungerford (p. 160) 4. (1) Prothoracic lateral lobe quadrate, if longer than broad, then of uniform width on sp cii's with a white spot on distal angle of corium 5 Prothoracic lateral lobe elongate 9 5. (4) Infraocular width of genae at level of the hypo-ocular suture as great as the diameter of the middle femur. Anterior femur of male conspicuously pro- duced at inner base C Western Hemisphere Corixidae ^ 157 Infraoi'ular width of genae at level (if the hypo-ocular suture narrower tlian the diameter of the middle femur. Anterior femur of male not conspicuously produced at inner base 7 6. (5) White spot at distal angle of coriuni nearly always present. Basal segments of abdominal venter not often reddish. Middle femora lacking the row of pegs described for G. abdominalis G. bimaculata (Guer.) (p. 102) White spot at distal angle of corium absent. Basal segments of abdommal venter usually reddish. Middle femur of male with a close set row of short pegs on caudoventral margin. Middle femur of female with two or three rows of procumbent pegs on ventral surface G. abdominalis (Say) (p. 164) 7. (5) Prothoracic lateral lobe plainly broader than width of middle femur, its rear margin conspicuously shorter than distal margin. Anal lobes of female deeply notched on inner ventral margin 8 Prothoracic lateral lobe about equal to width of middle femur, its rear margin not conspicuously shorter than distal margin. Anal lobes of female shal- lowly notched on inner ventral margin O. uhleri (Hungfd.) (p. 169) 8. (7) Lower basal angle of anterior femur roimdly but not greatly produced. Male right clasper broadest at basal third and pointed at tip. G. uhleroidea Hungfd. (p. 170) Lower basal angle of anterior femur not produced. Male right clasper broadest at distal third and rounded at tip G. cahfortiica (Hungfd.) (p. 172) 9. (4) Intraocular portion of genae broad laterally as seen in cephalic view 10 Infraocular portion of genae narrowing laterally, the face appearing consider- ably reduced G. emburyi Hungfd. (p. 174) 10. (9) Rear margin of eyes nearly straight. Postocular space of uniform width or broadest at inner angle of the eye H Rear margin of eyes concave and head margin convex, making the postocular space broadest about the middle. Right penultimate lobe of abdomen of male with peg at outer base G. serrulata (Uhler) (p. 176) 11. (10) Front femur conspicuously angularly produced at inner base in male and slightly produced in female. Metaxyphus not distinctly longer than wide. Strigil of male minute G. gerhardi Hungfd. (p. 179) Front femur not angularly produced at inner base. Metaxyphus distinctly longer than broad. Strigil not minute 12 12. (11) Prothoracic lateral lobe obliquely truncate; middle tarsus slightly longer than tibia 13 Prothoracic lateral lobe rounded at end; middle tarsus and tibia of equal length, or tarsus slightly shorter than tibia ^^ 13. (12) Male clasper as in drawing. Plate XXVIII, fig. 3 G. gentryi Hungfd. (p. 180) Male clasper as in drawing. Plate XXVIII, fig. 4 G. gentryi devnin Himgfd. (p. 181) 14. (12) Interocular space narrow, plainly less than width of eye as measured by projec- tion. Female with distal margin of sixth ventral abdominal segment incised laterally G. henryi Hungfd. (p. 182) Interocular space broad, equal to width of eye as measured by projection. Fe- male with sixth ventral abdominal segment normal . . . G. melanugaster (Kirk.) (p. 183) 158 The University Science Bulletin Graptocorixa riiimi Hungerford (Plate XXIX, figs. 2, 2a to 2e) ■ 1938. Graptocorixa ruina Hungerford, H. B. Jl. Kans. Ent. Soc, XI, No. i, pp. 139- 140, p. 141, figs. 1, 2. Size: Length 10.8 mm.; width across head, 3.2 mm. Color: This teneral specimen cannot be used for any typical color picture. The pronotum is crossed by fifteen brown bars, slightly narrower than the intervening pale ones. The wavy barring of the hemelytra has the brown bands slightly broader. The distal angle of the clavus with one brown bar erased. Structural characteristics: Male facial depression shallow, cov- ered sparsely with a pile of fine white hairs, laterad of which is a patch of longer hairs half way between the angle of the eye and the base of the beak. The antennal segments: 1 : 2 : 3 : 4 : : 27 : 20 : 60 : 18. Prothoracic lateral lobe broad, the rear margin shorter than the distal and rounding into it. The anterior femur of the male somewhat collapsed in this type. It lacks a stridulatory patch of pegs on its base but has spines as shown in figure 2 on Plate XXIX. The pala is shown in the same figure with forty-four pegs, the basal end of the row doubled back on itself, the pegs in the middle of the row larger and more pointed than the others. The middle leg: femur : tibia : tarsus : claws : : 100 : 29.7 : 36.9 : 19.8; the middle femur is thickened on its distal half, the beginning of the thickened portion marked by a row of conspicuous long hairs; the middle tarsus distinctly longer than its tibia. The hind leg: femur : tibia: tarsus 1 : tarsus 2 : : 100 : 87.8 : 115.5 : 30.4. The caudoventral margin of hind femur with a row of eighteen pegs, their size increasing to the distal end of the row. Metaxyphus length to its width as 50 : 38. The right clasper of the male, the hind femur, the middle femur, the rear "v^ew of the pala and the abdominal dorsum as shown in Figures 2a, 2b, 2c, 2d and 2e on Plate XXIX. The strigil with four combs, protected on its right side by the strongly sclerotized overlapping fold of the connexivum. The anal lobes asymmetrical, the right one smaller with a thickened tuft of hairs on its inner margin, and the left lobe with two hooklike flaps extended from its inner dorsal margin and a notch in its inner ventral margin. The genital capsule is collapsed in the type. Location of type: Holotype in the Francis Huntington Snow En- tomological Collections and labeled "Arroyo Marcial, District Ala- mos, Son., Mexico, Oct. 28, 1934, H. S. Gentry." This specimen Western Hemisphere Corixidae 159 taken same date and place as the specimen of G. robusta Hunger- ford. (See Plate XXX.) Comparative notes: The shape of the front femur of the male is like that of G. thomasi Hungerford and the modifications of the anal lobes and the shielded strigil also show a relationship to that species. It differs from G. thomasi Hungerford in having the prothoracic lateral lobe broader than long and in having st close set row of stout pegs on the rear margin of the hind femur. Graptocorixa robusta Hungerford (Plate XXIX, figs. 1, la to Ic) 1938. Graptocorixa robusta Hungerford, H. B. Jl. Kans. Ent. Soc. XI, No. 4, pp. 138- 139. P. 141, figs. 3, 7. Size: Length 6.6 mm. to 7.8 mm.; width across head 2.6 mm. to 2.94 mm. A strikingly robust species. Color: General color dark, the dark bands typically black and the pale bands ivory white ; the pronotum crossed by twelve or thir- teen dark, narrow, somewhat broken, bands that are broader than the pale interspaces; the wavy cross bands of the hemelytra with the dark bands broader except at inner angle of the clavus and near the tip of the corium; on the latter region the dark bands more or less erased leaving an irregular pale area; across the midsection of clavus and corium the black bands three or four times as broad as the pale ones; on the membrane the pale bands broader; base, mid- section and tip of embolium black; venter of thorax black with lighter margins; abdomen brown to blackish; the facial area dark brown, the pigment extending laterally below the eyes to the hypo- ocular suture and dorsally as a medium stripe between the eyes ; the legs shining, dark brown except basal half of palae which are white, the middle tarsi, the distal half of first segment of hind tarsus and all of the second which are light brown. Structural characteristics: Head as seen from above short and broad. Frontal depression of male rather shallow, covered with ap- pressed pile of fine white hairs; female face not depressed and sparsely covered with fine white hairs. Antennal segments: 1:2: 3 : 4 : : 28 : 18 : 48 : 22. Interocular space narrow, about three- fourths the eye width measured in projection; postocular strip widest at inner angle of the eyes. Prothoracic lateral lobe rather elongate and obliquely truncate. The anterior femur not produced at base, basal half pilose, this area margined distally with a trans- verse row of long spines above which is a short longitudinal row of 160 The University Science Bulletin short spines. The pala of the male elongate but longitudinally com- pressed into a thin strip, dorsally bearing beneath its inner margin a row of fifteen elongate pegs; the terminal claw moderately stout. See figures 1 and Ic on plate XXIX. The female pala typical for the genus. Middle and hind legs stout. The middle leg:^ femur : tibia : tarsus : claws : : 100 : 30 : 32.5 : 21.3. Thus the middle tarsus is a little longer than its tibia. The hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 83.3 : 128.5 : 30.9. Metaxyphus length to its width as 30 : 29, blunt at tip. The male genital capsule and abdominal dorsum as shown in figures la and lb on plate XXIX. The strigil small, with four combs, and partially hidden by the re- curved lateral margins of the sixth and seventh segments. Location of tijpes: Holotype, allotype and paratypes in the Francis Huntington Snow Entomological Collections, University of Kansas. Described from three males and four females labeled "Acapulco, Guerrero, Mexico, July 14, 1937, H. D. Thomas." I have had for several years a teneral male labeled "Arroya S. Mar- cial. District Alamos, Son., Mexico, Oct. 28, 1934, H. S. Gentry," and a female labeled "Mexico, June, July, 1933, H. E. Hinton, Tejupilco, district of Temascaltepec, Alt. 1340 meters." The above nine specimens comprise the type series. Comparative notes: This unique species agrees with G. thomasi Hungerford in having a relatively long middle tarsus and a male pala that digresses from the generic type. The rastrate surface, the color pattern of the hemelytra, the stout legs and the head char- acters are typically Graptocorixa. Its short, broad form distin- guishes it. Data on distribution: (Plate XXX) The type series showed a distribution in Guerrero, Sonora and Mexico, states of Mexico. We have in addition the following from Mexico: Michoacdn: Chinapa, Sept. 5, 1938, H. D. Thomas, 2 males, 2 females; Mexico: Teju- pilco, Temascaltepec, June 16, 1933, Hinton and Usinger, 4 males, 2 females. Graptocorixa thomasi Hungerford (Plate XXVIII, fifis 1, la and lb) 1938. Clraptocoriin llioniasi Hi;n<;crfnrd, H. B. Jl. Kans. Eiit. Soc, XI, No. 1, pp. 28- 30, text figs. 1-3. 1938. Graptocorixa thomasi, Hungerford, H. B. Jl. Kans. Ent. Soc, XI, No. 4, p. 134. Size: Length 9 mm. to 9.2 mm.; width across the head 3.1 mm. to 3.2 mm. Color: General facies moderately dark. In one specimen only Western Hemisphere Corixidae 161 the venter of the prothorax is dark. In another the venter of the thorax and the basal abdominal segments are nearly black. Pro- notum crossed by thirteen or fourteen dark bands that are, on the whole, slightly narrower than the pale interspaces. Corium and claviis crossed by transverse wavy bands; on the inner angle of the clavus the pale bands are broader than the dark ones. Elsewhere the reverse is true, except at the tip of the corium where there is an ill-defined pale area; the membrane is crossed by undulate bands; embolium sooty black. ' Structural characteristics : Face somewhat narrowed but not as greatly reduced as in some species of the genus. Facial depression of the male very slight and but sparsely covered with hair. The antennal segments: 1 : 2 : 3 : 4 : : 30 : 18 : 55 : 20 (both sexes). Prothoracic lateral lobe but little longer than broad, the anterior distal angle rounded. The anterior femur of the male conspicuously and angularly produced near the middle of the caudal margin; on the inner surface at this point is a transverse ridge, from the distal side of which are five stout curved bristles. No patch of stridu- lating pegs on femur. The anterior femur of the female of nearly uniform diameter; near the middle the caudal margin is produced and bears a row of four or five long bristles. The pala of the fe- male typical for the genus; the pala of the male as shown in figure 1 on plate XXVIII, its peculiar shape making this a readily recog- nized species. There are about fourteen pegs in the upper row and thirty-two pegs along the upper margin of the palm. The middle leg: femur : tibia : tarsus : claws : : 100 : 26.7 : 36.6 : 19.8; the tarsus conspicuously longer than the tibia. The hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 82.3 : 114.6 : 30.4; the tibia with anterior margin distally produced and spine-tipped; the first tarsal segment relatively broad. Metaxyphus length to its width as 43 : 34. The dorsal side of the male abdomen as shown in figure 2 on Plate XXVIII; the caudal lobes of the abdomen have the inner margins curiously modified into broad, more or less hooklike struc- tures; the strigil consists of two combs. The genital capsule as shown in figure lb, Plate XXVIII. Location of types: Holotype, allotype and one paratype (male) in Francis Huntington Snow Entomological Museum, University of Kansas. They are labeled "El Sabino, Uruapan, Mich., Mexico, Aug. 2, 1936, H. D. Thomas." Comparative notes: The elongate middle tarsus and the unique shape of the male pala readily characterize this species. 11—822 162 The 'University Science Bulletin Data on distribution: (Plate XXX) Known only by the types from Michoacdn, Mexico. Graptocorixa bimaculata (Guerin) (Plate XXV, figs. 2, 2a to 2d) 1844. Corixa bimaculata Guerin-Meneville, F. E. Icon, du Regne Animal . . . (In- sects), p. 354. 1851. Corixa bimaculata Guerin, Fieber, F. X. Species Generis Corisa, p. 42. 1876. Corixa bimaculata, Uhler, P. R. Bull. U. S. Geol. Geog. Survey 1, p. 340. (Places as syn. of C. abdominalis Say) 1876. Corixa bimaculata, Uhler, P. R. List of Hemiptera of Region West of the Missis- sippi River. (Reprint from above bulletin separately paginated. P. 74.) 1901. Corixa abdominalis. Champion, G. C. Biol. Centr. Am. Heter. II, p. 3S1, PI. 22, fig. 25. (Treated C. bimaculata Guer. as syn. in error.) ■ 1909. Arctocorisa bimaculata, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash., X, p. 194. [As syn. of A. abdominalis (Say).] 1917. Arctocorixa bimaculata. Van Duzee, E. P. Catalogue of Hemiptera, p. 478. [As syn. of .4. abdominalis (Say).] 1929. Sigara abdominalis bimaculata, Lundblad, O. Ento. Tidskrift, L., Haft 1, pp. 42- 46, Figs. 17-18, PI. V, fig. 8. 1930. Graptocorixa abdom-inalis bimaculata, Hungerford, H. B. Pan-Pacific Ent., VII, No. 1, p. 23. 1938. Graptocorixa bimaculata, Hungerford, H. B. Pan-Pacific Ent., XIV, No. 2, p. 76. 1938. Graptocorixa bimaculata, Hungerford, H. B. Jl. Kans. Ent. Soc, XI, No. 4, p. 134. [Distinct from G. abdominalis (Say).] Size: Length 8.4 mm. to 10.1 mm. Width across the head 2.8 mm. to 3.36 mm. Color: Characterized by a crescentic or round white spot in a black field at the distal angle of the corium of each hemelytron, suggesting the name "bimaculata," and abdomen not sanguineous, otherwise as in G. abdominalis (Say). Structural characteristics: Beak reduced, infraocular width of genae at level of the hypo-ocular suture as great as the diameter of the middle femur. Face even in the male not depressed but with three longitudinal grooves covered with mors or less dense hair mat. Antennal segments: 1 : 2 : 3 : 4 : : 40 : 21 : 58 : 20 3^ ; 1 : 2 : 3 : 4 : : 40 : 22 : 58 : 25 $ . Pronotum moderately rugulose. Hemelytra strongly rastrate. Front femur angulate at inner base, conspicuously so in the male which has a triangular stridulatory patch of pegs and below it 3 or 4 tufts of stout spines followed by longer spines. The pala of the male as shown in figures 2 and 2b on plate XXV. The middle femur of male lacking the peg row that characterizes G. abdominalis (Say), but having the row of long hairs; the middle femur of the female lacking the peg rows de- scribed for G. abdominalis (Say). (See figs. 2c and 2d on Plate XXV.) Middle leg: femur : tibia : tarsus : claws : : 100 : 35 : 33 : 25. Hind leg: tibia : tarsus 1 : tarsus 2 : : 100 : 94.1 : 125.3 : 39.4. Western Hemisphere Corixidae 163 Metaxyphus length to its width as 34 : 27. The eighth abdominal lobes of female not notched on their inner ventral surface. The male genital capsule and abdominal dorsum as shown in figures 2a and 2e on Plate XXV. Location of types: Two males in the Paris Museum bear the label "Museum Paris. Coll. Guerin-Menev. ex coll. A Salle 1897." ''Mexique" One is marked type. I examined the other specimen and it is what I have known as this species. Comparative notes: This species has long been confused with G. abdominalis (Say) from which it can be readily separated in both sexes. There never has been any difficulty in sorting out typically marked specimens of G. bimaculata (Guerin) with the conspicuous white spot at the tip of the corium. However, perplexity arose when we encountered specimens of G. bimaculata (Guerin) with the white spots greatly reduced or specimens of G. abdominalis (Say) in which the pale bars at the tip of the corium became confluent, re- sulting in pale spots. Plate XXV shows differences in the male pala, in the right genital claspers and in the middle femora. G. abdominalis (Say) has a row of stout pegs on the femur of the male and two or three rows of procumbent pegs on the ventral surface X)f the femur of the female. These are lacking in G. bimaculata (Guerin). Data on distribution: (Plate XXX) The following records have been published: Guatemala (as ahdominalis by Champion) 1901; Mexico, 1929; Colima, Vulcano, Mexico, 1930; Guatemala, 1930; Costa Rica, 1930; Oaxaca, Mexico, 1938; Mexico, 1944. The fol- lowing material has been examined in connection with this study: Costa Rica: Baker (U. S. N. M.). Guatemala: (C. F. Baker Col.) Mexico: Oaxaca: Mitla, May 2, L. 0. Howard (U. S. N. M.); 5,000 ft. el. semidesert, semitropical, Aug. 20, 1937, Meldon Embury (13 males, 18 females) ; Oaxaca, Aug. 25, 1937, H. D. Thomas (11 males, 50 females) ; near Chasumba, July 28, 1932, Hobart Smith (1 female). Veracruz: Orizaba, July 30, 1937, H. D. Thomas (1 female). Guerrero: Salto de Valadez, 325 klm. s. of Mex. City, Oct. 30, 1936, H. D. Thomas (1 female). • Michoacdn: 10 mi. down Chinapa Road, Sept. 5, 1938, H. D. Thomas (9 males, 14 females) ; Morelia, Sept. 4, 1938, H. D. Thomas (1 male, 2 females) {G. abdominalis taken also) ; Zamora, 164 The University Science Bulletin Sept. 9, 1938, H. D. Thomas (1 female) ; Carapa, Sept. 8, 1938, H. D. Thomas (2 females) ; Patzcuaro, Aug. 31, 1938, H. D. Thomas (1 female) ; Tancitara, Aug. 8, 1940, F. Schacht (1 male, 1 female). Colina: Vulcano, L. Conrad (U. S. N. M.) (2 males). Jalisco: Chapala, Sept. 11, 1938, H. D. Thomas (23 males, 45 females), (G. abdojninalis taken at same time); Guadalajara, Te- quilla Rd. 28 mi. N. of Jalisco, Sept. 13, 1938, H. D. Thomas (29 males, 30 females) ; Union de Tula, Sept. 16, 1938, H. D. Thomas (1 female) ; Tecolotlan, Sept. 15, 1938, H. D. Thomas (13 males, 26 females) ; Corriente, Aug. 24, 1937, H. D. Thomas (1 female) ; 15 mi. s. w. of Lake Chapala, Sept. 14, 1938, H. D. Thomas (4 males, 11 females) ; 15 klm. west of Jalapa, July 18, 1937, H. D. Thomas (1 male). Aguascalientes: Aug. 9, 1944, H. D. Thomas (2 males, 3 females), [taken with G. ahdoininalis (Say)]. Puebla: Near Zapatillan, July 26, 1932, Hobart Smith (1 male, 6 females) ; July 14, 1937, H. D. Thomas (1 male) ; Tehuacan, Aug. 25, 1937, H. D. Thomas (4 females). Mexico: Tejupilco, Temescaltepec, June 24, 1933, Hinton and Usinger (CaHf. Acad.), (1 male in K. U. Col.). D. F.: Lake Texcoco, July 26, 1937, H. D. Thomas. Morelos: Tepoztlan, Aug. 1, 1938, L. Lipovsky (1 male, 2 fe- males) ; July 14, 1936, H. D. Thomas, 12 males, 9 females) ; Cuer- navaca, Oct. 1, 5, 6, 17, 1936, H. D. Thomas (130 males, 130 fe- males) ; Cuernavaca, Aug. 20-26, 1929, G. Lassman (1 female) ; Cuernavaca, May 16, 1898, (Ball Coll. in U. S. N. M.) (4 males, 5 females) ; Cuernavaca, Aug. 16, 1944, N. L. H. Klauss (U. S. N. M.) (1 female) ; Mazatepec, April 29, 1944 J. C. Shaw, (1 male, 2 fe- males). Graptocorixa abdominalis (Say) (Plate XXV, figs. 1, la to Id ; wash drawing No. 38, Plate VI) 1832. Corixa abdominalis Say, Thomas. Heteroptera New Harmony, p. 38. 1851. Corixa abdominalis, Say, Fieber, F. X. Species Generis Corisa, p. 42. 1857. Carixa abdominalis. Say, Thomas. Fitch Reprint, p. 811, in Trans. N. Y. State Agri. Soc, XVII. 1869. Corixa abdominalis. Say, Thomas. Complete Writings I (cd. by Le Conte), |)p. 366-3fi7. 1870. Corixa abdomirwli.i, Uhler, P. R. Bull. U. S. Geol. Geog. Survey I, p. 340 (Dist : Cal.-Tex.). 1876. Corixa abdominalis, Uhler, P. R. List of Heniiptora of Region West of the Missis- sipjji River. (Reprint from above Bulletin, separately paginated, p. 74.) 1894. Corisa abdominalis, Uhler, P. R. Proc. Calif. Acad. Sci. (ser. 2) IV, p, 294 (Dist: Lower California). Western Hemisphere Corixidae 165 1909. Arctocorisa abdominalis. Kirkaldy, G. W., and Tone-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 194 (in part). 1917. Arctocoriia abdominalis. Van Duzee, E. P. Catalogue of Hemiptera, p. 478 (in part). 1922. Arctocorixa abdominalis, Hungerford, H. B., and Moore, R. C. Kans. Univ. Sei. Bull. XIV, p. 417, (Record Utah). 1925. Arctocorixa abdominalis, Hungerford, H. B. Bull. Brook. Ent. Soc. XX, p. 21 (C femorata Guerin not a syn.). 1928. Arctocorixa abdominalis, Hungerford, H. B. Annals Ent. Soc. Amer. XXI, p. 141 (Dist. Note). 1929. Corixa abdominalis Say, Hungerford, H.- B. Pan-Pacific Ent. VI, No. 2, p. 73. 1930. Graptocorixa abdominalis, Hungerford, H. B. Pan-Pacific Ent. VII, No. 1, p. 22. (Type of new genus.) 1931. Arctocorixa abdominalis, Torre-Bueno, J. R. dv la. Bull. Brooklyn Ent. Soc. XXVI, No. 3, p. 138. (Records Alpine, Tex.) 1931. Graptocorixa abdominalis, Jaczewski, T. Annales Musei Zool. Polonici, IX, No. 15, p. 191, PI. XXV, fig. 1, (Mex. D. F. Tizapan, Jalisco). 1933. Graptocorixa ahdomitmlis, Ancona, H. L. Anale.s del Institute de Biologia T. IV. No. 1, p. 53. 1938. Graptocorixa abdominalis, Hungerford, H. B. .11. Kans. Ent. Soc. XI, No. 4. p. 134. [Distinct from G. himaculata (Guer.).l 1939. Arctocorixa abdominalis, Millspaugh, Dick. D. Field and Lab., VII, No. 2, p. 83. Size: Length 8.55 mm. to 10.8 mm. Width across the head 2.8 mm. to 3.5 mm. The average length being 10 mm. Color: General facies dark. Abdomen typically sanguineous on basal segments both dorsally and ventrally. Pronotum crossed by 12 to 16 dark bands, the anterior ones broader than the others which are slender and often broken. The transverse bands of the hem- elytra more or less undulate, the dark bands broader than the light ones. Face, thoracic venter, distal end of abdomen, distal half of pala, distal end of femur, tibia and tarsus of middle legs, distal end of first tarsal segment and all of the second tarsal segment of hind leg embrowned to black. Structural characteristics: Beak reduced, infraocular width of genae at level of the hypo-ocular suture as great as the diameter of the. middle femur. Face even in the male not depressed but with three longitudinal grooves covered with more or less dense hair mat. Antennal segments: 1 : 2 : 3 : 4 : : 38 : 22 : 50 : 28 3^ ; 1 : 2 : 3 : 4 : : 38 : 22 : 52 : 33 5 . Pronotum moderately rugulose. Hem- elytra strongly rastrate. Front femur angulate at inner base, con- spicuously so in male which has a triangular stridulatory patch of pegs and below it three or four tufts of stout spines followed by a row of longer spines. The pala of male as shown in figures 1 and lb on Plate XXV. The middle femur of male with a close set row of short pegs on caudoventral margin, the middle femur of female with two or three rows of procumbent pegs on ventral surface. (See figures Ic and Id on Plate XXV.) Middle leg: femur : tibia : tar- sus : claws :: 100 : 36 : 30.4 : 20.9. Hind leg: femur : tibia : tar- 166 The Uxiversity Science Bulletin sus 1 : tarsus 2 : : 100: 93.5 : 116.9 : 35.1. Metaxyphus length to its width as 34 : 27. The eighth abdominal lobes of female not notched on their inner ventral surface. The male genital capsule and ab- ' dominal dorsum as shown in figures la and le on Plate XXV. Location of types: The Say types have been lost. Say described the species from material "found in Mexico by William Bennett and sent me by Mr. Maclure." A neotype is here designated. It bears the label "Tlalpan, D. F. Mexico, 11-3-1936, H. D. Thomas" and is deposited in the Francis Huntington Snow Entomological Museum, University of Kansas. Comparative notes: This species Say characterized as having "abdomen sanguineous at base." While this is veiy striking on many specimens, perhaps the majority, it is not a universal marking. The basal segments may be only faintly orange instead. Its closest relative is G. himacidata (Guerin) from which it may be separated readily by the key and the figures on Plate XXV. Data on distribution: (Plate XXX.) The following records have been published: Mexico, 1832; California and Texas, 1876; Lower California, 1894; Kane Co., Utah, 1922; Superstition Mts., Arizona, 1925; Sutton Co., Presidio Co., Culberson Co., Valentine and Alpine, Texas; Organ Mts., A''. M.; Catalina Mts., Sabino Basin in Catalina Mts., Hot Springs, Warsaw, Superstition Mts., Quartzside, Cochise Co., Gila Co., Yavapai Co., Santa Cruz Co., Oracle, Yuma Co., Arizona; Palo Verde, Imperial Co., California; Espiritu Santo Island, Gulf of California, 1930; Alpine, Texas, 1931; Tizapan, Mexico, D. F., 1931. The following material has been examined in connection with this study: Mexico: Michoacdn: Morelia, Sept. 4, 1938, H. D. Thomas. (G. bimaculata taken at same time) ; Zacapu, Sept. 1, 1938, H. D. Thomas (1 female). Jalisco: Chapala, Sept. 11, 1938, H. D. Thomas (6 males, 5 fe- males), {G. bimaculata 'taken at same time); Tecolotlan, Sept. 15, 1938, H. D. Thomas (1 male) ; 15 km. west of Jalapa, July 18, 1937, H. D. Thomas (4 males, 5 females). Sonora: Conejos Dist. Alamos, Oct. 26, 1934, H. S. Gentry (14 males, 19 females). Lower California: Triunfo, July 7, 1938, Michelbacker and Ross (1 male and 1 female) ; El Paraiso, Chas. D. Haines, May, 1889 (] male) (Uhler Coll.). Western Hemisphere Corixidae 167 Chihuahua: July 14, 1938, L. Lipovsky (9 females) ; San Louis Babarocos, Dec. 30, 1934, H. S. Gentry (7 males, 8 females) ; Cari- mechi, Rio Mayo, Dec. 12, 1934, H. S. Gentry (2 females, and Jan. 6, 1935, 1 male, 1 female). Aguascalientes : Aug. 9, 1944, H. D. Thomas, 14 males, 8 fe- males (taken with G. bimaculata Guer). Guanajuato: 10 miles N. E. Leon, Aug. 17, 1932, Hobart Smith; Saltillo, H. D. Thomas (3 males, 3 females). San Luis Potosi: 20 miles west of, Aug. 8, 1944, H. D. Thomas, 5 males, 10 females; Aug. 4 and 5, 1944, H. D. Thomas, 50 males, 26 females. Coahuila: Buena Vista, el. 7,000 ft. Sierra del Cannen, July 7, 1938, Rollin H. Baker; Canon del Hillcoat, el. 7,000 ft. Sierra del Carmen, July 10, 1938, Rollin H. Baker (2 males, 4 females). Puebla: Puebla, July 24, Aug. 16, 1937, H. D. Thomas (36 males, 33 females). Districto Federal: Tlalpan, Nov. 3, 1936, H. D. Thomas; Mexico, "Ahuautlea Mexicana," 1 male (U. S. N. M.) ; Mexico, W. H. Ash- mead (1 male) (U.S. N. M.). U.S.A.: California: Palo Verde, Dec. 30, 1929, Desert Tank, E. R. Hall; Monterrey (U.S. N. M.) (3 females). Utah: S. E. Kane Co., 1921, R. C. Moore. Arizona: C. U. (1 female) (Uhler Col.) ; Hot Springs, Barber and Schwarz (3 females) (U. S. N. M.) ; Quartzsite (3 males, 4 females) ; Yuma Co. (E. P. Van Duzee) ; Santa Catalina Mts., Sabino Basin, Oct. 3, C. H. Townsend (1 male) ; Santa Catalina Mts., Nov. 20, 1933, Bryant (Bryant Col.) ; Santa Catalina Mts., No. 33-403, Bryant (Biyant Col.) ; Cienega Creek, near Pantano, Alt. 3,200 ft., Mar. 12, 1932, D. K. Duncan (1 male) ; Cienega Creek, near Pan- tano, Alt. 3,200 ft., March 12, 1932, D. K. Duncan (Lutz) ; Babo- quivari Mts., Oct., 1934, Frank Blanchard (4 males, 3 females) ; same place, F. H. Snow (6 males, 10 females) ; same place, 1937, W. Benedict (2 males, 2 females) ; same place, July 16, 1932, R. H. Beamer, Jr. (3 males, 12 females) ; same place, July 18, 1932, R. H. Beamer (1 male, 3 females) ; Sabino Canyon, July 14, 1932, J. D. Beamer (1 male) ; Tucson, March 15, 1916, Sabino Canyon (Parsh- ley) ; Tucson, 1935, Owen Bryant, No. 55 (Bryant) ; Lepache Lake, March 10, 1932, D. K. Duncan (Lutz) ; Bear Canyon, Santa Cata- lina Mts., Jan. 2, 1938, E. C. Van Dyke (Calif. Acad. Sci.) ; Santa 168 The University Science Bulletin Cruz Co., Aug. 4, 1927, P. A. Readio and R. H. Beamer (1 male, 2 females) ; Santa Cruz Mts., July 17, 1932, and June 12, 1933, R. H. Beamer (3 females) ; Santa Rita Mts., March 23, 1933, Bryant (Bryant Col.) ; same place, July 17, 1932, R. H. Beamer (2 fe- males) ; same place, June 12, 1933, R. H. Beamer (2 females) ; same place, July 19, 1938, D. W. Craik (1 female); Chiricahua Mts., July 8, 1932, R. H. Beamer (3 males, 1 female) ; same place, July 5, 1940, L. C. Kuitert (1 female) ;\same place, July 14, 1938, D. W. Craik (1 female); same place, Owen Bryant (Bryant Col.); Hua- chuca Mts., July 8, 1932, R. H. Beamer (6 males, 10 females) ; Cochise Co., July 29, 1927, L. D. Anderson, R. H. Beamer (8 males, 2 females) ; Superstition Mts., Nov. 7, 1922, P. A. Click (9 males, 3 females); Warsaw, Dec. 4, 1893 (1 female) (U. S. N. M. ace. 28058) ; Oracle, 14 mi. east, July 27, 1924, J. 0. Martin (Calif. Acad. Sci.); Tortillita Mts., Owen Bryant, No. 33-53 (Bryant); Fox- borough Ranch, Owen Bryant, No. 36-93 (Bryant) ; Gila Co., Aug. 5, 1927, R. H. Beamer (4 males, 6 females) ; same place, Aug. 6, 1927, P. A. Readio (1 male); Globe, Duncan (Calif. Acad. Sci.); Superior, Mar. 21, 1933, Br>\ant (Bryant Col.) ; Miami, July 22, 1932, R. H. Beamer (1 male) ; Yavapai Co., Aug. 9, 1927, P. A. Readio and L. D. Anderson (3 males, 3 females) ; Santa Rita Mts., July 26, 1925, (U. S. N. M.) (2 males, 1 female) ; Huachuca Mts. (U. S. N. M.) (2 males, 1 female) ; same place, 5,150 ft., March 16, 1919, R. D. Camp, (1 male, 2 females) ; Pima Co., Catalina Mts., Aug. 6, 1930, L. K. Gloyd (Mich. Coll.) (1 female). NeiLy Mexico: Silver City, July 22, 1936, J. D. Beamer (1 male) ; Messila Park, July 18, 1927, L. D. Anderson (2 females) ; Organ Mts., La Cueva, Alt. 5,300 ft., Townsend (1 female) (U. S. N. M.) ; Wagonmound, July 18, 1936, M. B. Jackson. Texas: Jeff Davis, July 19, 1933 (1 male, 1 female) ; Davis Mts., July 12, 1938, D. W. Craik (1 male, 1 female) ; Alpine, Feb. 27, G. P. Englehardt (6 males, 6 females) ; Sutton Co., July 20, 1928, R. H. Beamer (3 males, 6 females) ; same place and date, J. G. Shaw (1 male, 2 females) ; Presidio Co., July 16, 1927, P. A. Readio (2 fe- males) ; Culberson Co., July 14, 1928, W. Benedict (9 males, 14 fe- males) ; Valentine, July 12, 1938, D. W. Craik (16 males, 12 fe- males) ; same place, July 13, 1938, R. H. Beamer (4 males, 5 females) ; Brownsville, Esper Ranch (U. S. N. M.) (1 male) ; Ft. Davis, 1914, C. Thompson (3 females) ; Boat Springs, Chisos Mts., 7,000 ft., July 20, 1928, F. M. Gaige (U. S.N.M.) (3 males, 3 females) . Western Hemisphere Corixidae 169 Oklahoma: Kenton, Cimmaron Co., July 15, 1926, T. H. Hubbell (Hubbell Coll.) (4 males, 5 females). Nevada: Washoe Co., Grass Valley Springs, Aug. 31, 1939, C. L. Hubbs (Mich. Coll.) (2 females). Graptocoj'ixa ithleri (Hungerford) (Plate XXVI, figs. 2, 2a and 2b) 1925. Arctocorixa uhleri Hungerford, H. B. Bull. Brooklyn Ent. Soc, XX, p. 19, pi. II, fig. 9. 1930. Graptocorixa uhleri. Hungerford, H. B. Pan-Pacific Ent., VII, No. 1, p. 22. 1938. Graptocorixa uhleri. Hungerford, H. B. Jl. KaiLs. Ent. Soc, XI, No. 4, p. 136. Size: Length 7.98 mm. to 9 mm.; width across the head 2.48 mm. to 2.75 mm. Color: General color medium to Iiglit above due to the broad pale yellow bands on pronotum and clavus. Yellow bands of pronotum often twice as wide as the black which are slender, somewhat fur- cate, uneven and about twelve in number. Clavus and corium crossed by continuous wavy bands. Membrane covered throughout by irregular zigzag yellow lines. The pattern on corium and mem- brane usually continuous without a line of demarcation. Embolium pale except for sooty to black patch on nodal furrow, margin beyond furrow checkered. Thoracic sternites, coxae, trochanters and base of femora black. Abdominal venter yellow to black, its dorsum basally may be sanguineous. Head and most of legs yellow, the dorsal side of middle femora and hind tibiae with dark longitudinal streak. Structural characteristics: Beak reduced; intraocular width of genae at level of the hypo-ocular suture narrower than the diameter of the middle femur. Face provided with large dense patch of long silvery hair. Antennal segments: ' 1 : 2 : 3 : 4 : : 30 : 20 : 48 : 30 ^J , and 30 : 20 : 53 : 30 $ . Prothoracic lobe about equal to width of hind femur, its rear margin not conspicuously shorter than its distal margin. The lower basal angle of anterior femur not conspicuously produced ; the male with a tuft of hairs in place of a patch of pegs ; three or four transverse rows of bristles, the basal ones short, the distal ones long on the base of the femur; the pala of the male slender, shaped as in G. calif ornica (Hungerford) but provided with twenty-five or twenty-six pegs only. (See Plate XXVI, fig. 2.) Middle leg: femur : tibia : tarsus : claw : : 100 : 37.7 : 35.5 : 25.5. Hind leg: femur : tibia : tarsus : tarsus 2 : : 100 : 91 : 109.2 : 32.8. Metaxyphus length to its width as 30 : 21. The eighth abdominal lobes (anal lobes) of female shallowly notched on their inner ventral 170 The University Science Bulletin margin. The male genital capsule and abdominal dorsum as shown in figures 2a and 2b, plate XXVI. The strigil large, circular, with the combs very irregular. Location of types: Described from four specimens in the Uhler collection at Washington bearing the label "San Bernardino, CaUf." Holotype and allotype in the United States National Museum at Washington, D. C. Paratypes in the Francis Huntington Snow Col- lections, University of Kansas. Comparative notes: Smaller than G. calif ornica (Hungerford) and lighter in color; rastrations on tegmina less marked; strigil of male relatively larger and claspers of different shape. The anal lobes of female not deeply notched as they are in G. californica (Hungerford). Data on distribution: (Plate XXX.) Besides the types we have studied the following: California: San Diego Co., July 4, 1929, L. D. Anderson (5 males, 7 females) ; San Diego Co., July 28, 1929, P. W. Oman (2 females) ; Pine Valley, July 27, 1938, D. W. Craik (2 females); Warner Springs, July 28, 1938, R. I. Sailer (1 female) ; Descanso, Aug., 1914, W. S. Wright (1 female) ; Ventura Co., Aug. 12, 1916, E. 0. Essig (2 males, 1 female) (Usinger Col.) ; Santa Cruz Isld., May 18, 1919, E. P. Van Duzee (1 male) ; Santa Cruz Isld., Santa Barbara Co., July 27-31, 1915, C. H. Kennedy (1 male, 3 females) ; Nipoma, San Luis Obispo Co., July 24, 1935, Jack and R. H. Beamer (12 males, 20 females) ; San Bernardino Co., Mohave R., Aug. 31, 1934, C. L. Hubbs (Mich. Coll.) (1 male, 2 females) ; Santa Barbara Co., June 13, 1916, C. L. Hubbs (Field Mus. Coll.) (1 male, 1 female). Nevada: (Uhler Coll.) (U. S. N. M.) (2 males, 2 females). Graptocorixa uhleroidea Hungerford (Plate XXVI, figs. 3, 3a to 3b) 1938. Graptocorixa uhleroidea Hungerford, H. B. Jl. Kans. Ent. Soc, XI, No. 4, pp. 135-136. P. 141, fig. 8. Size: Length 9.3 mm. to 10 mm.; width across head 2.7 mm. to 3.1 mm. Color: General color dark above; abdominal dorsum more or less red, the caudal end dark to black; sternum black; venter of ab- domen yellow in females to nearly black in some males; head and legs yellow except basal third of hind femora which are brown. Pronotum crossed by fourteen to sixteen dark bands that are some- what irregular and incomplete and about as wide as the intervening Western Hemisphere Corixidae 171 pale lines. The hemelytra crossed by wavy bands, the dark ones wider than the light ones except at the base of the clavus; at distal end of corium the dark bars usually interrupted or erased to produce a small irregular pale area ; the wavy barring of the membrane more or less complete; basal half of embolium pale; irregular sooty patch at nodal furrow, most of embolar margin checkered. Structural characteristics: The so-called beak reduced. The in- fraocular width of genae at level of the hypo-ocular suture narrower than the diameter of the middle femur. Frontal depression of male oval, not reaching the eyes and the area in both sexes covered with a dense patch of long silvery hair. Antennal segments: 1:2:3: 4 : : 32 : 20 : 60 : 32 (^ ; 1 : 2 : 3 : 4 : : 35 : 22 : 63 : 35 2 . Faint me- dian longitudinal carina on pronotum more distinct in anterior por- tion. Prothoracic lateral lobe plainly broader than the width of middle femur, its rear margin conspicuously shorter than distal mar- gin. The lower basal angle of anterior femur roundly but not greatly produced ; with a tuft of long bristles on anterior face of pro- duced portion in both sexes. In one entire series from Monrovia Canyon, California (Mar. 2, 1930), the males have shed these spines, leaving three or four rows of lunate sockets where the bristles stood. Pala of the male as shown in figure 3 on Plate XXVI; long and slender, slightly curved and ending in a stout claw; a row of thirty-three pegs extending from the base to tip. Middle and hind legs stout. Middle leg: femur : tibia : tarsus : claws :: 100 : 38 : 34.2 : 18.1. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 95.2 : 113.6 : 33.4. Metaxyphus length to its width as 34 : 28. The eighth abdominal lobes (anal lobes) of female deeply notched on inner ventral margin. The male genital capsule and ab- dominal dorsum as shown in figures 3a and 3b on Plate XXVI. The strigil of male large, straight on inner margin, rounded on outer margin; about twelve combs, outer ones short. The male genital capsule with right clasper broader on basal half and left clasper more pointed than in G. uhleri. Location of types: Holotype, allotype and paratypes in Francis Huntington Snow Entomological Collection, University of Kansas. Described from 19 males and 21 females labeled "Monrovia Can- yon, California, March 2, 1930, C. H. Martin." Comparative notes: The name is suggested by the similarity of the male clasper to that of G. uhleri Hungerford. The species in other respects is near G. calif ornica (Hungerford) from which it 172 The University Science Bulletin differs by liaving the base of the anterior femora definitely but not greatly produced at base. Data on distribution: (Plate XXX) Besides the type series, we have the following records: California: Mission Creek, Santa Barbara, 1915, C. H. Kennedy, 8 males, 3 females (Cornell) ; Alpine, July 2, 1929, Paul W. Oman, 1 male; Bautista Can., April 8, 1931, C. H. Martin, 1 male; San Diego Co., July 4, 1929, L. D. Anderson and P. W. Oman, 4 males, 3 females; Pine Valley, July 27, 1938, D. W. Craik, 10 males, 8 females; Yuba Co., Camp Beale, Jan. 22, 1944; Eugene Ray (Field Mus. Coll.) (1 male, 1 female). Graptocorixa californica (Hungerford) (Plate XXVI, figs. 1, ]a and lb) 1925. Arctocoriia californica Hungerford, H. R. Bull. Brooklyn Ent. See, XX, p. 18, PI. II, fig. 10. 1930. Graptocorixa californica, Hungerford, H. B. Pan-Pacific Ent., VII, No. 1, )). 22. Size: Length 8 mm. to 10.5 mm.; width across head 2.5 mm. to 3.2 mm. Color: General facies dark; thoracic venter brown to black; ab- dominal venter yellow to nearly black in some males but not red- dish as in G. abdorninalis (Say) ; abdominal dorsum may be san- guineous. Pronotum, clavus and corium strongly rastrate, surface appearing rough. Pronotum crossed by about eighteen pale lines that are somewhat irregular and incomplete and about as wide as the intervening dark lines; clavus and corium crossed by parallel, continuous, wavy lines; those at base of clavus broadest, those at middle of clavus somewhat broken; membrane provided throughout with short, slender, undulate, pale lines; basal half of embolium pale; irregular sooty patch at nodal furrow, most of margin checkered. Prosternum and coxae more or less dusky. Structural characteristics: Beak reduced; infraocular width of genae at level of the hypo-ocular suture narrower than the diam- eter of the middle femur. Face in both sexes with a large dense patch of long silvery hair. The heatl is usually yellow in color, but the area beneath the large mat of hair is usually dark. Antennal segments: 1 : 2 : 3 : 4 : : 40 : 21 : 60 : 31 j ; 1 : 2 : 3 : 4 : : 38 : 21 : 57 : 31 $ . Eyes, frons and jironotum more strikingly defined in male than in female. Faint median longitudinal carina on pro- notum, more distinct in anterior portion. Prothoracic lateral lobe plainly broader than width of middle femur, its rear margin con- Western Hemisphere Corixidae 173 spicuously shorter than its distal margin. The lower basal angle of anterior femur not produced ; the male with a tuft of hairs in place of a patch of pegs; four transverse rows of bristles, the first short bristles, the others long bristles on the base of the femur; the pala of the male as shown in figure 1, Plate XXVI, long and slender, its base no broader than tibia to which it is attached and tapering to tip which is provided with a stout claw ; the male pala more slender than that of female and provided on its inner .base (which is exceed- ingly narrow) with a row of thirty-two pegs extending from base to tip. Middle leg: femur : tibia : tarsus : claw : : 100 : 37.8 : 33.3 : 18.9. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 98 : 125.6 : 44.7. Metaxyphus length to its width as 30 : 23. The eighth abdominal lobes (anal lobes) of female deeply notched on their inner ventral margin. The male genital capsule and abdominal dorsum as shown in figures la and lb on plate XXVI. The strigil of male quadrate, with twelve combs. Location of types: This species was described from eighteen speci- mens from California. Holotype, allotype and some paratypes in Francis Huntington Snow Collections, University of Kansas. Para- types in Stanford University, United States National Museum, and the private collection of J. R. de la Torre-Bueno. Comparative notes: This species is much like G. abdominalis (Say). The palae in both sexes are more slender and the surface of the pronotum and hemelytra more rastrate. Its closest relatives are G. uhleroidea Hungerford and G. uhleri (Hungerford) from which it differs as stated in the key on page 157. Data on distribution: (Plate XXX). Besides the type series, one of which is labeled "Fresh running water," we have studied the following: California: Pine Valley, San Diego Co., July 27, 1938, R. I. Sailer (4 nymphs) ; Descanso, San Diego Co., Aug. 7, 1914, J. C. Bradley (2 males, 2 females) ; San Jacinto Mts., Riverside Co., July 21, 1929, P. W. Oman (1 female) ; Indio, July 24, 1929, P. W. Oman (1 fe- male) ; Pasadena, Los Angeles Co., Febr. (2 females) ; Bautista Canyon, July 5, 1931, C. H. Martin (1 female) ; Santa Barbara, July 7, 1907 (Drake) ; Atascadero, July 19, 1933, R. H. Beamer (4 males, 23 females) ; Jamesburg, Monterey Co., Aug. 11, 1938, D. W. Craik (17 males, 16 females); Giant Forest, Tulare Co., July 28, 1929, L. D. Anderson (1 male, 3 females) ; Sequoia Nat'l Pk., Aug. 6, 1940, L. C. Kuitert (1 female) ; Lone Pine, Inyo Co., Aug. 28, 1940, L. C. Kuitert (1 female) ; Huntington Lake, Fresno Co., 7,000 ft., 174 The University Science Bulletin July 10, 1919, F. C. Clark (1 female) (Calif. Acad.) ; Redwood Cn., Fresno Co., Alt. 6,000 ft., E. C. Van Dyke, 1 male (Calif. Acad.) ; Tuoleme Meadows, Mariposa Co., Aug. 1, 1940, L. C. Kuitert (1 female); Alma, Santa Clara Co., June 22, 1931, C. H. Martin (1 male, 4 females) ; Menlo Pk., San Mateo Co., Jan., 1905, F. Hornung (1 female) ; Alameda Co., Niles Canyon, Aug. 14, 1927 (Usinger) ; Yosemite Nat'l Park, Aug. 1, 1940, L. C. Kuitert (7 males, 9 fe- males) ; Yosemite, Aug. 23, 1936, Owen Bryant (Bryant Col.) ; Glacier Pk., Alt. 7,214 ft., June 15, 1928 (Usinger) ; Pothole Mead- ows, June 14, 1928 (Usinger) ; Pothole Meadows, Alt. 7,750 ft., June 14, 1928, F. A. Haasis (Cal. Acad.) ; Berkeley, Oct. 23, 1929, Jean Linsdale (2 females) ; Mokelumne Hill, Calaveras Co., May 29, 1931 (Usinger) ; Alpine Co., July, 1934, J. E. Blum (Cal. Acad.) ; Antioch, Sacramento Co., July 20, 1935, Jack Beamer (1 female) ; Mt. Tamalpais, Marin Co., Aug. 15, 1938, D. W. Craik (1 female) ; Towie, Placer Co., Aug. 20, 1938, D. W. Craik (1 male) ; Eureka, Humboldt Co., July 15, 1935, R. H. Beamer (1 male) ; Clayton, Shasta Co., July 20, 1935, Jack Beamer (1 male, 1 female) ; Clay- ton, Shasta Co., July 14, 1918, E. P. Van Duzee (1 female) (Cal. Acad.) ; California, T. H. Hubbell (Hubbell Coll.) (1 male) ; Ala- meda Co., Feb., 1910, J. C. Bridwell (U. S. N. M.) (1 female). Oregon: Grant's Pass, July 12, 1935, Jack and R. H. Beamer (5 males, 31 females) ; Heppner, July 27 and Aug. 25, 1907, Nettie Currin (1 male, 2 females) (Drake) ; Philomath, Oct. 17, 1903, Gil- latly (Drake) ; Corvallis, Oct. 17, 1903, Gillatly (Drake) ; Yoncalla, July 12, 1935, R. H. Beamer (5 males, 3 females) ; Gaston, 1 male. Graptocorixa emhuryi Hungerford (Plate XXVII, figs. 4, 4a to 4c) 1938. Graptocorixa emburyi Hungerford, H. B. Pan-Pacific Ent. XIV, No. 2, pp. 76-77. P. 80, figs. 6, 7, 8 and 9. Size: Length 5.9 mm. to 6.1 mm.; width across head 1.8 mm. to 1.9 mm. Color: General color dark with pattern typical for the genus. Pronotum crossed by nine or ten dark bands, no wider than the pale interspaces; the anterior four entire, others may be somewhat split. Pale lines on base of clavus more or less reddish and broader than the dark ones, elsewhere on the hemelytra the dark bands are as broad or a little broader than the pale ones and undulate. Basal half of embolium reddish; a sooty blotch on nodal furrow, behind which the margin is checkered. Venter brown to black. Head and Western Hemisphere Corixidae 175 legs yellowish, only the base of the middle tibia and distal end of middle tarsus embrowned. Structural characteristics: The so-called beak reduced. (See fig- ure 4a, Plate XXVII.) Frontal depression of male shallow and somewhat pilose, often densely so; female with facial area flat and moderately pilose. Infraocular portion of genae narrowing later- ally, the face appearing considerably reduced. Antennal segments: 1 : 2 : 3 : 4 : : 22 : 16 : 42 : 20 (both sexes) . Prothoracic lateral lobe moderately elongate. The lower basal angle of the anterior femur not angularly produced, a small patch of short bristles on an elevated area in the male. The pala of the male as shown in figure 4 on plate XXVII with thirty-six to forty pegs; pala long and slen- der and ending in a stout claw in both sexes. Middle leg: femur : tibia : tarsus : claws : : 100 : 38 : 31.9 : 28.9. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 :' 94.6 : 111.6 : 36.1. Metaxyphus length to its width as 26 : 24. The male genital capsule and abdom- inal dorsum as shown in figures 4b and 4c on Plate XXVII. The male strigil with six longitudinal combs. Location of types: The male holotype, the allotype and eight paratypes, all females, labeled "Mexico, June 10, 1937, Meldon Em- bury, San Antonio, near El Salto, 5,000 ft. above sea level, semi- tropical," are in the Francis Huntington Snow Entomological Mu- seum, University of Kansas. Comparative notes: This species is a trifle smaller than G. serru- lata (Uhler). It differs from Uhler's species in the more slender pala, reduced beak, sharper metaxyphus, the shape of the strigil, and in lacking the curious projection on the penultimate abdominal segment that characterizes the male of G. serrulata (Uhler) . Data on distribution: (Plate XXX) Besides the type series, we have: Mexico: Michoacdn: El Sabino, Uruapan, Aug. 2, 1936, H. D. Thomas, 2 males, 4 females; Tancitaro, alt. 6,586 ft. permanent pool, Aug. 8, 1940, F. Schacht, 1 male, 1 female (taken with G. henryi). Sonora: San Bernardo, Rio Mayo, Oct. 14, 1934, H. S. Gentry, 3 males, 12 females; Rio Mayo, Arroyo de los Mescales, Feb. 16, 1935, H. S. Gently, 11 males, 3 females. Chihuahua: Carimechi, Rio Mayo, Jan. 1, 1935, H. S. Gentry, 3 males, 12 females. 176 The University Science Bulletin Graptocorixa serrulata (Uhler) (Plate XXVII, figs. 3, 3a to 3c) 1897. Corixa serrulata Uhler, P. R. Trans. Md. Acad. Sci. I, p. 391. 1901. Corixa serrulata. Champion, G. C. Biol. Centr. Amer. Heter., II, ]i. 381. 1909. Arctocorisa serrulata, Kirkakly, G. W. mikI Tone-Bueno, J. R. dc h\. Catalogue hi Proc. Wash. Ent. Soc, X, Nos. 3-4, p. 197. 1917. Arctocorixa serrulata. Van Duzee, E. P. Catalogue of Hemiptera, p. 483. 1925. Arctocorixa serrulata, Hungerford, H. B. Bull. Brooklyn Ent. Soc, XX, Xo. 1, pp. 17-18. (Dist. .\riz.) 1930. Graptocorixa serrulata, Hungerford, H. B. Pan-Pacific Ent., VII, No. 1. p. 22. 1928. Graptocorixa serrulata, Hungerford, H. B. Pan-Pacific Ent., XIV, p. 77. P. 80, fig. 10. Size: Length 6.1 mm. to 6.7 mm.; width across head 1.9 mm. to 2.1 mm. Color: General facies medium to dark; pronotum crossed by about nine dark brown to nearly black bands, the anterior two or three of which are broader than the others which may be somewhat broken or furcate; hemelytra crossed by wavy, somewhat broken, bands, the dark ones on the whole slightly broader than the pale ones, except at inner base of clavus ; the confluence of the pale ones often marking the margin of the membrane; embolium with a blackish spot on the nodal furrow. Venter mostly brown to black; the abdominal dorsum somewhat sanguineous. Head ivory white to yellow except beak and frons which may be embrowned. Legs ivory white to yellow with the apical half of the pala, dorsal side of anterior femur, the dorsal distal half of middle femur, base of middle tibia and tip of tarsus embrowned to black. Structural characteristics: Frontal depression of male broadly oval, deep and covered with appressed pile of white hair. Female face rounded, with few hairs. Infraocular portion of genae broad laterally as seen in cephalic view. Antennal segments: 1:2:3: 4 : : 20 : 15 : 40 : 16 (both sexes). Rear margin of eyes concave and head margin convex, making the postocular space broadest about the middle. Prothoracic lateral lobe elongate. The lower basal angle of the anterior femur not angularly produced; a small rusty patch of elongate pegs or short spines on base of male femur. The pala of the male as shown in figure 3 on plate XXVII, possessing a row of about forty to forty-four pegs. Middle leg: femur : tibia : tarsus : claws : : 100 : 32.9 : 28.6 : 28.6. The femur in both sexes with a close set row of pegs on its caudo-ventral margin. The hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 81 : 108 : 40.5. Metaxyphus length to its width as 30 : 30. The male genital capsule and abdominal dorsum as shown in figures 3b and 3c on plate XXVII. The strigil with five or six combs. The right penultimate Western Hemisphere Corixidae 177 lobe of the abdomen of the male (seventh segment) with peglike projection at its outer base. Location of types: In the United States National Museum from the P. R. Uhler collection are three male specimens, one bearing the labels "Bradsh. Mt., Ariz., 6-16-92," "P. R. Uhler Collection," and "Corixa serrulata Uhler," the last in Uhler's handwriting. This we are labeling the holotype. Another is labeled "Mexico high- lands," "P. R. Uhler Collection" and determined by Uhler as "Corixa maculati-pes Uhler Mex." The third specimen is labeled "N. M.," "P. R. Uhler Collection." Since in Uhler's description he says ". . . it inhabits the highlands of Mexico, Southern California and Arizona," we must not admit the "N. M." specimen in the type series but may assume that he intended to include the Mexican highland specimen. As yet we have not found the Southern Cali- fornia specimens. Comparative notes: This little species is distinguished from others of similar size by having a closely set row of pegs on the caudo-ventral margin of the middle femur in both sexes and a finger or peg-like projection on the outer base of the right penultimate lobe of the male abdomen. Data on distribution: (Plate XXX). We have before us the fol- lowing: Mexico: Michoacdn: Morelia, Sept. 3, 1938, H. D. Thomas, 1 male. Chihuahua: July 14-22, 1938, L. J. Lipovsky, 18 males, 14 fe- males; San Antonio, July 15, 1927, L. D. Anderson, 3 males, 13 females; Rio San Pedro, June 22, 1934, Smith and Dunkle, 9 males, 3 females; Sta. Eulalia, 1934, W. F. Foshag (U.S.N. M.), 4 males, 6 females. Guerrero: Papagochie R., 1934, W. F. Foshag (U. S. N. M.), 1 male, 3 females. U. S. A.: Oregon: Harney Co., July 26, 1934, C. L. Hubbs (Mich. Coll.), 1 female. Nevada: White Pine Co., Spring Valley, July 6, 1938, Hubbs family (Mich. Coll.), 1 female. Arizona: Pima Co., Aug. 16, 1927, P. A. Readio, 3 males, 3 fe- males; Tucson, F. H. Snow, 14 males, 34 females; Tucson, Jan. 27, 1935 (Bryant Coll.) ; Santa Catalina Mts., May 8, 1933 (Bryant Coll.) ; Ciencga Creek, near Pantano, alt. 3,200 ft., March 12, 1932, 12—822 178 The University Science Bulletin Duncan (Lutz) ; Baboquivari Mts., F. H. Snow, 4 males, 4 females; same place, July 18, 1932, R. H. Beamer, 2 males, 9 females; S. W. edge of Tucson, July 20, 1932, R. H. Beamer, 3 males, 6 females; Santa Rita Mts., June, F. H. Snow, 1 female; same place, July 17, 1932, R. H. Beamer, 7 males, 6 females; Ruby, July 13, 1940, L. C. Kuitert, 1 male; Oro Blanco Mts., April 3, 1937, Owen Bryant; Santa Cruz Co., Aug. 4, 1927, R. H. Beamer, 9 males, 6 females; by Readio, 5 males, 9 females; Tubac, Aug. 21, 1935, Jack Beamer, 1 male, 2 females; by R. H. Beamer, 4 males, 4 females; Cochise Co., July 29, 1927, R. H. Beamer, 1 female; Chiricahua Mts., July 8, 1932, R. H. Beamer, 1 male, 3 females; same place, July 14, 1938, D. W. Craik, 6 males, 8 females; same place, July 5, 1940, L. C. Kuitert, 1 female; Huachuca Mts., July 8, 1932, R. H. Beamer, 7 males, 4 females; same place, Sunnyside Canyon, July 9, 1940, L. C. Kuitert, 7 males, 26 females; Maricopa Co., July 1, 1929, Beamer and Anderson, 4 males, 4 females; by Paul Oman, Aug. 2, 1929, 2 males, 1 female; Gila Co., Aug. 5, 1927, P. A. Readio, 7 males, 7 females; Oracle, 14 mi. east, July 27, 1924, J. 0. Martin (Calif. Acad.) ; Yavapai Co., Aug. 9, 1927, R. H. Beamer, 3 males, 3 fe- males; Bradshaw Mts., June 18, 1892 (Drake Coll.); Bill Wms. Fork, Aug., F. H. Snow, 7 specimens; Yavapai Co., Camp Verde, Sept. 2, 1938, Hubbs family (Mich. Coll.), 2 females; Coconimo Co., General Springs, Aug. 29, 1935, I. J. Cantrall, 3 males, 3 females; Santa Rita Mts., July 21, 1938, R. I. Sailer (U.S.N. M.), 1 male, 1 female; Huachuca Mts., Sunnyside Canyon, July 9, 1940, (U. S. N. M.), 9 males, 4 females; Catalina Mts., Sabino Canyon, Oct. 26, 1915, F. Tucker, 1 female; Santa Cruz Co., July 9, 1940, M. F. Ash- burn, 1 female. New Mexico: Silver City, July 22, 1936, J. D. Beamer and M. B. Jackson, 28 males, 15 females; Belen, July 20, 1936, W. D. Field, 1 male; White Oak, July 1, 1923, K. C. Doering, 1 female; Mimbres R., Luna Co., June 9, 1938, Hubbs family (Mich. Coll.), 16 males, 68 females. Texas: Presidio Co., July 16, 1927, R. H. Beamer, 2 males, 7 females; Brew.ster Co., Rio Grande, June 13-17, 1908, Mitchell and Cushman, 11 males, 15 females, det. by Uhler (U. S. N. M.) ; Jeff Davis, July 19, 1933, R. H. Beamer, 6 males, 13 females; Ft. Davis, July 12, 1938, L. W. Hepner, 1 female; Davis Mts., July 12, 1938, R. I. Sailer, 3 males, 5 females; by D. W. Craik, 1 male, 6 females; Valentine, July 13, 1927, R. H. Beamer, 8 males, 6 females. Western Hemisphere Corixidae 179 Graptocorixa gerhardi (Hungerford) (Plate XXVII, figs. 1, la and lb) 1925. Arctocorixa gerhardi Hungerford, H. B. Bull. Brooklyn Ent. Soc, XX, pp. 21-22, PI. II, fig. 1. 1930. Graptocorixa gerhardi, Hungerford, H. B. Pan-Pacific Ent., VII, No. 1, p. 25. (Dist. Ariz., Texas.) 1931. Graptocorixa gerhardi, Jaczewski, T. Annales Musei Zool. Polonici, IX, No. 15, p. 191, PI. XXV, figs. 2-6. (Dist. Mexico, D. F., Chapultepec.) 1939. Graptocorixa gerhardi, Millspaugh, Dick D. Field and Lab., VII, No. 2, p. 85. Size: Length 7 mm. to 8.4 mm.; width across head 2.26 mm. to 2.73 mm. Color: General facies dark; head and legs, including coxae, yel- low; mesosternum nearly black and metasternum and abdominal venter more or less black, especially on the males ; abdominal dor- sum may be partly sanguineous. Pronotum crossed by eight or nine pale bands that are usually narrower than dark ones, but show con- siderable variation. On the hemelytra the pale bands are broadest at inner angle of the clavus, elsewhere they are more or less un- dulate and sometimes broken, especially on the membrane. Structural characteristics: Face not reduced; frontal depression of male shallow but broad and covered with appressed silvery hair ; face of female not flattened and with few hairs. Infraocular por- tion of genae broad laterally as seen in cephalic view. Antennal segments: 1 : 2 : 3 : 4 : : 30 : 15 : 50 : 12 ( ^y ) ; 1 : 2 : 3 : 4 : : 30 : 15 : 50 : 10 ( 2 ). Rear margin of eyes nearly straight. Prothoracic lateral lobe elongate. The lower basal angle of the an- terior femur conspicuously produced in male and covered with a patch of short hairs; slightly produced in female. The pala of the male as shown in figure 1, Plate XXVII, possesses about twenty-five pegs. Middle leg: femur : tibia : tarsus : claws :: 100 : 33.6 : 29 : 25.5. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 88.8 : 115.4 : 44.4. Metaxyphus length to its width as 20 : 20. The male genital capsule and abdominal dorsum as shown in figures la and lb on Plate XXVII. The strigil is minute and at the tip of a strongly sclerotized process which is broader at base. The preceding seg- ment has a unique fingerlike projection near its right margin. Location of types: Holotype male from "Gila River, N. M., July 9, W. J. Gerhard" in Francis Huntington Snow Entomological Col- lection, University of Kansas. Comparative notes: This species differs from G. melanog aster (Kirk.) in having the front femur produced at inner base and in having a shorter metaxyphus. 180 The Uxiversity Science Bulletin Data on disti-ibutio7i: (Plate XXX). U. S. A.: Texas: Mu^quiz Canon, Ft. Davis, July 6, 1917. 1 male, 1 female (Cornell) ; Limpia Canon, Davis Mts., July 7, 1917, 1 male (Cornell) ; Brewster Co., May 3, 1927, J. O. Martin, 8 males, 3 females; Alpine, May 12, 1927, J. 0. Martin, 1 male; Ft. Davis Mts. (U. S. N. M.) 1 male, 1 female; Alpine, July 25 (Lutz Coll.), 1 male, 1 female. New Mexico: Gila River, July 9, W. J. Gerhard, type, 1 male. Arizona: Santa Cruz Co., Aug. 4, 1927, Beamer and Readio, 6 males, 4 females; Santa Cruz Co., June 9, 1940, M. F. Fishburn, 1 male (U. S. N. M.) ; Gila Co., Aug. 5, 1927, P. A. Readio, 1 male; Cochise Co., July 29, 1927, R. H. Beamer, 4 females; Santa Rita Mts., July 24, 1927, P. A. Readio, 1 female; Baboquivari Mts., July 18, 1932, R. H. Beamer, 1 female; Huachuca Mts., July 8, 1932, R. H. Beamer, 8 males, 3 females; Huachuca Mts., May 29, 1937, W. Benedict, 2 males, 1 female; Sunnyside Canyon, Huachuca Mts.. July 9, 1940, L. Kuitert, 9 males, 16 females; Carr Canyon, Hua- chuca Mts., June 24, 1932 (Usinger Col.) ; Santa Catalina Mts., Owen Bryant; Arivaca, April 3, 1937, Owen Bryant; Santa Cruz Co., (U. S. N. M.), 1 male; Santa Cruz Co., Sept. 7, 1938, Hubbs family (Mich. Coll.), 1 female. Mexico: Jalisco: Chapala, Sept. 11, 1938, H. D. Thomas, 2 males, 1 female; Union de Flores, Sept. 16, 1938, H. D. Thomas, 1 male. Chihuahua: 1 female (Uhler Coll.) ; Choncho and Vaica, July 19- 22, 1938, L. J. Lipovsky, 4 males, 3 females; Rio San Pedro, June 23, 1934, Smith and Dunkle, 1 male. AguascaUentes : July 16, 1934, Smith and Dunkle, 1 female. San Luis Potosi: Aug., 1944, Henry Thomas, 27 males, 26 fe- males; 20 miles west of San Luis Potosi, Aug. 8, 1944, Henry Thomas, 1 male, 3 females. Puebla: Puebla, July 18, 1937, H. D. Thomas, 1 male, 1 female; Puebla, July 24, 1937, H. D. Thomas, 2 males, 2 females. Mexico: D. F., Chapultepec, Aug. 2, 1929, T. Jaczewski, 3 males, 2 females, 3 larvae. (Reported by Jaczewski.). Graptocorixa gentryi Hungerford (Plate XXVIII, figs. 3, 3a and 3b) 1938. Graptocorixa gentryi Hungerford, H. B. Jl. Kans. Ent. Soc, XI, No. -1, pp. 136- 137, p. 141, hg. 5. Size: Length 6.8 mm. to 7.2 mm.; width across head 2.2 mm. to 2.4 mm. Western Hemisphere Corixidae 181 Color: General color dark; pronotum crossed by nine or ten dark bands about as wide as the pale interspaces; hemelytra crossed by wavy, somewhat broken, bands, the dark ones on the whole slightly broader than the pale ones, except at the inner base of the clavus; the pattern continuing over the membrane but sometimes separated from the corium by a pale streak. Venter may be light or dark; the abdominal dorsum may be somewhat sanguineous. Head and legs yellow except the distal half of the palae, the tibiae and tip of tarsi of middle legs usually dark. * Struchiral characteristics: Frontal depression of male broadly oval, nearly attaining margin of eye and covered with inconspicuous appressed pile of white hair. Female face rounded. Infraocular portion of genae broad laterally as seen in cephalic view. Antennal segments: 1 : 2 : 3 : 4 : : 25 : 20 : 45 : 15 ( ^J ) ; 1 : 2 : 3 : 4 : : 25 : 20 : 50 : 18 ( 5 ) . Rear margin of eyes nearly straight. Pro- thoracic lateral lobe slightly elongate, obliquely truncate. The lower basal angle of the anterior femur not angularly produced. The pala of the male as shown in figure 2a on Plate XXVIII pos- sessing a row of about 36-38 pegs. Middle leg: femur : tibia : tarsus : claws : : 100 : 30.6 : 31.9 : 23.9; thus the middle tarsus is slightly longer than the tibia. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 87.5 : 112.5 : 45. Metaxyphus length to its width as 38 : 28. The male genital capsule and abdominal dorsum as shown in figures 2 and 2b on Plate XXVIII. The male strigil with 4 combs. Location of types: Holotype, allotype and 7 paratypes in Francis Huntington Snow Entomological Collection, University of Kansas. Series labeled "San Barnardo, Rio Mayo, Sonora, Mexico, Oct. 14, 1934, H. S. Gentry." Com-parative notes: This species which is about the size of G. serrulata (Uhler) is readily distinguished from it by the narrower postocular area of the head, by the prothoracic lateral lobe, which is broader and more obliquely truncate, as well as by the more slen- der and tapering male pala. Data on distribution: (Plate XXX). Known only from the type series from Sonora, Mexico. Graptocorixa gentryi devlini Hungerford (Plate XXVIII, figs. 4, 4a and 4h) 1938. Graptocorixa gentryi devlini Hungerford, H. B. ,11. Kans. Ent. Soc, XI, No. 4, pp. 137-141, fig. 4. 182 The University Science Bulletin Size: Length 6.5 mm. to 6.9 mm.; width across' head 2.2 mm. to 2.4 mm. Color: As in G. gentryi Hungerford. Structural characteristics: Differs from G. gentryi Hungerford only in some minor points, the most noteworthy of which is the right clasper of the male. The seven males all have a conspicuous patch of rather long white hairs on the middle femur whereas the four males of G. gentryi do not. Antennal segments: 1 : 2 : 3 : 4 : : 20 18 : 40 : 18 in both sexes. Middle leg: femur : tibia : tarsus claw :: 100 : 27.9 : 31.9 : 21.3. Hind leg: femur : tibia : tarsus 1 tarsus 2 : : 100 : 79.5 : 104.4 : 34.1. Thus the tibia and tarsus of hind leg are relatively shorter than in G. gentryi. The male genital cap- sule and abdominal dorsum as shown in figures 3 and 3b on plate xxvni. Location of types: Holotyi>e, allotype and one paratype female labeled "Cuautla Morelos, Mexico, October 12, 1936, H. D. Thomas." Two paratypes from "El Sabino, Uruapan, Mich., Mex., July 28, 1936, H. D. Thomas," male and female. All in Francis Huntington Snow Entomological Collection, University of Kansas. Data on distribution: (Plate XXX). Besides the types: Mexico: Michoacdn: Near Chinapa, Sept. 5, 1938, H. D. Thomas, 3 males, 5 females; El Sabino, Uruapan, July 24, 1936, H. D. Thomas, 2 females. Mexico: Tejupilco, Temascaltepec, July 16, 1933, Hinton and Usinger, 2 males, 1 female. ' Morelos: Acatlipa, Km. 88 on Hgw. Mexico City to Acapulco, May 6, 1945, J. G. Shaw. Graptocorixa henryi Hungerford (Plate XXVIII, figs. 2, 2a and 2b) 1938. Graptocorixa henryi Hungerford, H. B. JI. Kans. Ent. Soc. XI, No. 4, pp. 137- 138. P. 141, fig. 6. Size: Length 6 mm. to 6.3 mm.; width across head 1.9 mm. to 2 mm. Color: Moderately dark, a little lighter and less contrastingly marked than in G. serrulata (Uhler) ; the pronotum crossed by eight or nine brown lines, usually narrower than the pale interspaces and the last four more or less broken; the dark barring of the hemelytra wavy, somewhat interjoined and on the whole very slightly broader than the pale interspaces; head and legs yellowish to light brown; venter of same color, somewhat infuscated. Western Hemisphere Corixidae 183 Structural characteristics: Frontal depression of male broadly oval and covered with a pile of appressed white hairs. Female face rounded with the white hairs more sparsely covering the area. In- fraocular portion of genae broad laterally as seen in cephalic view. Antennal segments: 1 : 2 : 3 : 4 : : 25 : 14 : 49 : 12 ( ^ ) ; 1 : 2 : 3 : 4 : : 25 : 14 : 48 : 12 ( 2 ) . Interocular space narrow, plainly less than width of eye as measured by projection. Postocular strip of uniform width. Prothoracic lateral lobes rather elongate and rounded at the tip. The lower basal angle of the anterior femur not angularly produced. The pala of the male as shown in figure la on Plate XXVIII and with a row of about 32 pegs. Middle leg: femur : tibia : tarsus : claws : : 100 : 32.9 : 28.6 : 34.3. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 77.5 : 100 : 45. Metaxy- phus length to its width as 30 : 25. The rear margin of the anti- penultimate ventral abdominal segment of female (sixth segment) incised on its right side (left side of insect). The male genital cap- sule and abdominal dorsum as shown in figures 1 and lb on Plate XXVIII. The male strigil circular in outline and consisting of about seven combs. Location of types: Holotype, allotype and fifteen paratypes in the Francis Huntington Snow Collection, University of Kansas. Described from nine males and eight females labeled "El Sabino, Uruapan, Michoacan, Mexico, Aug. 2, 1936, H. D. Thomas." Comparative notes: This species is near G. melanogaster (Kirk.) from which it differs by its smaller size and narrower interocular space. From G. serrulata (Uhler) it differs by its more elongate metaxyphus and from G. gentryi Hungerford by its rounded pro- thoracic lateral lobe. Data on distribution: (Plate XXX) . Besides the type series we have the following: Mexico: Michoacan: "Tancitaro, Alt. 6,586 ft.. Permanent Pool, Aug. 8, 1940, F. Schacht," 2 males, 4 females (male and female of G. emburyi taken with these). Morelos: Morelos, July 14, 1936, H. D. Thomas, 2 males; Cuer- , navaca, July 8, 1936, H. D. Thomas, 1 male. Graptocorixa melanogaster (Kirkaldy) (Plate XXVII, figs. 2, 2a and 2b) 1899. Corixa melanogaster Kirkaldy, G. W. Entomologist, XXXII, p. 193. 1901. Corixa melanogaster. Champion, G. C. Biol. Centr. Amer. Het. II, p. 381 (quot.). 1901. Corixa unyuiculata Champion, G. C. Biol. Centr. Amer. Het. II, p. 382, PI. XXII, figs. 26, 26a, b. (I examined type from British Mus., syn. of above.) 184 The University Science Bulletin 1909. Arctocorisa melanogagt er , Kirkaldy, G. W., mid Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. 8of. Wash. X, Nos. 3 and 4, p. 196. 1909. Arctocorisa unguiculata, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. See. Wash. X, Nos. 3 and 4, p. 197. 1925. Arctocorixa vielanogaster, Hungerford, H. B. Bull. Brooklyn Ent. Soc. XX, pp. 20- 21 (reports C. uiigviculata Champ, as syn.). 1930. Graptocorixa melanogaster, Hungerford, H. B. Pan-Pacific Ent. VII, No. 1, pp. 22-23, and 25. 1931. Graptocorixa melanogaster, Jaczewski, T. .■\nnales Musei Zoologici Polonici IX, Nr. 10, p. 150, PI. XIII, figs. 1-4. 1938. Graptocorixa melanogaster, Hungerford, H. B. Jl. Kans. Ent. Soc. XI, No. 4, p. 138. Size: Length 7.6 mm. tu 8.1 mm.; width across head 2.3 mm. to 2.5 mm. Color: General facies dark; pronotmn crossed by nine to eleven dark bands about as broad as the pale interspaces; hemelytra crossed by wavy, somewhat broken bands, the dark ones usually broader than the pale ones except at base of clavus; the pattern continuing over the membrane without line of demarcation. Tho- racic venter mostly black and abdomen of male usually black. Head and legs yellow except for the coxae, trochanters, base of front femora, base of middle tibiae, tips of middle and hind tarsi which are usually embrowned. Structural characteristics : Facial impression of the male broadly oval and covered with an appressed pile of white hair. Female face somewhat flattened with sparse pile of white hair. Infraocular portion of genae broad laterally as seen in cephalic view. Antennal segments: 1 : 2 : 3 : 4 : : 24 : 18 : 50 : 17 ^J ; 1 : 2 : 3 : 4 : : 25 : 19 : 52 : 18 § . Interocular space broad, equal to width of eye measured by projection. Rear margin of eyes nearly straight. In the females the distal half of the pruinose area along the claval suture obscured by the depressed margin of the clavus. Prothoracic lateral lobe rounded rather than obliquely truncate. The lower basal- angle of the anterior femur not angularly produced, but ele- vated and provided with a rusty-colored patch of short, spiniform, thickened hairs in the male. The pala of the male as shown in figure 2 on Plate XXVII and provided with a row of 35 to 40 pegs. Middle leg: femur : tibia : tarsus : claws : : 100 : 33.6 : 31.3 : 32.5 Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 84.4 : 106.6 : 40. The distal third of the ventral caudal margin of the hind femur with a close set row of 20-25 short spines in both sexes which dis- tinguishes this species from all other Graptocorixa of comparable size. Metaxyphus length to its width as 38 : 28. The male genital capsule and abdominal dorsum as shown in figure 2b and 2a on Western Hemisphere Corixidae 185 Plate XXVII. The male strigil fairly large, nearly circular, some- times nearly square, with 6-8 or more combs and attached by a pedicle, only the base of which is exposed. In the female the ventral lateral lobes of the seventh abdominal segment very broad and medianly expanded on the caudal margin. Location of types: This species was described by Kirkaldy from Alajueta, Costa Rica, and came to him by way of Doctor Mon- tandon. Upon Kirkaldy's death the type, a male, went to J. R. de la Torre-Bueno who kindly sent it to me with other Corixidae of the Kirkaldy collection. It is at present in the University of Kansas collection. It bears the label "Type — Corixa melanogaster Kirk. 1899." One wing cover, the right one, is removed and mounted on a card below. Both front claws are gone from the palae which probably is the reason Kirkaldy failed to mention a prominent claw and this led Doctor Champion to think his C. unguiculata was different. Corixa unguiculata Champion was described from Oaxaca, Mexico, and Costa Rica. I have examined the type at the British Museum and it is the same as G. melanogaster Kirkaldy. It bears the fol- lowing labels: "B. C. A. Rhyn. II, Corixa unguiculata Ch. type," "Costa Rica (Biolley) ," "Distant Col." Comparative notes: This species differs from similar species in having the distal third of the ventral caudal margin of the hind femur provided with a close set row of 20-25 short spines. Com- parable species have only a few such spines and they are not closely set. Data on distribution: (Plate XXX.) Costa Rica: Alajueta (type male) ; San Jose, Feb. 1905, P. Biolley, 2 males, 1 female (Bueno Col.) ; Vista del Mar, 1,400 m.. Mar. 1905, P. Biolley, 1 male; San Jose, June and July, 1931, H. Schmidt, 2 males, 8 females; San Jose, March 6, 1931, H. Schmidt, 2 males; 9 females. San Jose, H. Schmidt, 1932, 1 male, 3 females; Costa Rica, Feb. 10, 1932, H. Schmidt, 39 males, 54 females; Costa Rica, June 23, 1932, B. S. Kaiser (Usinger Col.) ; Rio Virilla, Dec. 16, 1931, H. Schmidt, 42 males, 52 females. Mexico: Oaxaca. 186 The University Science Bulletin PLATE XXV Graptocorixa Hungerford Fig. 1. Graptoconxa abdominalis (Say) ; front leg of male. Fig. la. Genital capsule of male. Fig. lb. Pala of female. Fig. Ic. Middle femur of male. Fig. Id. Middle femur of female. Fig. le. Dorsal view of male abdomen. Fig. 2. Graptoconxa bimaculata (Guerin) ; front leg of male. Fig. 2a. Genital capsule of male. Fig. 2b. Pala of female. Fig. 2c. Middle femur of male. Fig. 2d. Middle femur of female. Fig. 2e. Dorsal view of male abdomen. Western Hemisphere Corixidae 187 PLATE XXV 188 The University Science Bulletin PLATE XXVI Graptocoiixa Hungerford Fig. 1. Graplocorixa californica (Hungerford); pala of male Fig. la. Genital capsule of male. Fig. lb. Dorsal view of male abdomen. Fig. 2. Graplocorixa uhleri (Hungerford); pala of male Fig. 2a. Genital capsule of male. Fig. 2b. Dorsal view of male abdomen. Fig. 3. Graplocorixa uhleroidea (Hungerford) ; pala of male Fig. 3a. Genital capsule of male. Fig. 3b. Dorsal view of male abdomen. Western Hemisphere Corixidae 189 PLATE XXVI 190 The University Science Bulletin PLATE XXVII Graptocorixa Hungerford Fig. 1. Graptocorixa gerhardi (Hungerford) ; front leg of male. Fig. la. Dorsal view of male abdomen. Fig. lb. Genital capsule of male. Fig. 2. Graptocorixa melanog aster (Kirkaldy) ; front leg of male. Fig. 2a. Dorsal view of male abdomen. Fig. 2b. Genital capsule of male. Fig. 3. Graptoconxa serrulata (Uhler) ; pala of male. Fig. 3a. Frontal view of head. Fig. 3b. Genital capsule of male. Fig. 3c. Dorsal view of male abdomen. Fig. 4. Graptocorixa emburyi Hungerford; pala of male. Fig. 4a. Frontal view of head. F^g. 4b. Genital capsule of male. Fig. 4c. Dorsal view of male abdomen. Western Hemisphere Corixidae 191 PLATE XXVII 192 The University Science Bulletin PLATE XXVIII Graptocorixa Hungei'ford Fig. 1. Graptocorixa thomasi Hungerford ; dorsal view of male abdomen. Fig. la. Pala of male. Fig. lb. Genital capsule. Fig. 2. Graptocorixa henryi Hungerford; genital capsule of male. Fig. 2a. Pala of male. Fig. 2b. Dorsal view of male abdomen. Fig. 3. Grapioconxa gentryi Hungerford; genital capsule of male. Fig. 3a. Pala of male. Fig. 3b. Dorsal view of male abdomen. Fig. 4. Graptocorixa gentryi devlini Hungerford; genital capsule of male. Fig. 4a. Pala of male. Fig. 4b. Dorsal view of male abdomen. Western Hemisphere Corixidae 193 PLATE XXVIII 13—822 194 The University Science Bulletin PLATE XXIX Graptocorixa Hunger ford Fig. 1. Graptoconxa robusta Hungerford; pala of male. Fig. la. Genital capsule of male. FiQ. lb. Dorsal view of male abdomen. Fig. Ic. Dorsal view of male pala. Fig. 2. Graptoconxa ruina Hungerford; front leg of male. Fig. 2a. Right clasper of male genital capsule. Fig. 2b. Hind femur of male, ventral view. Fig. 2c. Right view of right pala of male. Fig. 2d. Middle femur of male. Fig. 2e. Dorsal view of male abdomen. Western Hemisphere Corixidae 195 PLATE XXIX 196 The University Science Billetin PLATE XXX IS S) Is 4n^-*- /. V. B •-^« a J^ SRtPTOCORDIA ABOOMINALIS ■ G BmACULOTA Q 5 MELAHOGASTUR • G SCIfRULATA 3 5, BCRHARDI A C UHLERI ® 0 THOM/ISI * C UHLERO/Ota * <= «OBUST« H C CALIFORftICA H <" "LIINI 10^ f G HENRYI 9 G CENTRri ^ G GENrRyj DEVLINI 4 0 EMSURVI Western Hemisphere Corixidae 197 The Tribe Corixini Walton This tribe includes 20 genera and 13 subgenera which we have ar- ranged below to show their phylogenetic relationships as correctly as we believe it is possible to do in a linear order. We consider the genus Sigara with its many subgenera as the most recent and within it the subgenus Tropocorixa contains our most variable species. Ectemnostega Enderlein. Genotype quadrata (Sign.) P- 200 Ectemnostegella Lundblad. Genotype montana Lundb P- 206 Krizousacorixa Hungerford. Genotype femorata (Guer.) p. 227 Trichocorixella Jaczewski. Genotype mexicana (Hungfd.) P- 236 Palmacorixa Abbott. Genotype gillettei Abbott P- 242 Corisella Lundblad. Genotype mercenaria (Say) P- 259 Trkhocoriia Kirkaldy. Genotype verficalis (Fieber) p. 289 Pscudocorixa Jaczewski. CJenotype guatemalensis (Clianip.) P- 408 Morphocorixa Jaczewski. Genotype compact a (Hungfd.) P- 422 Neosigara Lundblad. Genotype columbiensis Lundb P- 429 Centrocorisa Lundblad. Genotype kollarii (Fieb.) P- 436 Ramphocorixa Abbott. Genotype acuminata (Uhler) p. 448 Callicoriia B. White. Genotype praeusta (Fieb.) p. 457 Corixa* Geoffroy. Genotype punctata (lUig.) Hesperocorixa Kirkaldy. Genotype brimleyi Kirk p. 497 [Including Anticorixa Jaczewski. Genotype sahlbergi (Fieb.)] Xenocorixa* Hungerford. Genotype vittipennis (Horv.) p- 199 Heliocorisa* Lundblad. Genotype vermicidata (Put.) P- 199 Cenocorixa Hungerford. Genotype wileycB (Hungfd.) p. 564 Arctocorisa Wallengren. Genotype carinata (Sahib.) p. 588 Sigara Fabricius. Genotype striata (Linn.) P- 609 Arctosigara Hungerford. Subgenotype conocephala (Hungfd.) P- 614 Allosigara Hungerford. Subgenotype decorata (Abbott) P- 629 Parasigara* Poisson. Subgenotype transversa (Fieb.) Sigara* Fabricius. Subgenotype striata (Linn.) p. 609 Xenosigara Hungerford. Subgenotype ornata (Abbott) p. 631 Pileosigara Hungerford. Subgenotype douglasensis (Hungfd.) P- 634 Aphelosigara Hungerford. Subgenotype jarmanae (Hungfd.) p. 636 Pediosigara Hungerford. Subgenotype hydatotrephes (Kirk.) p. 638 Subsigara Stichel. Subgenotype fossarum (Leach) p. 642 Lasiosinara Hungerford. Subgenotype lincata (Forst.) P- 645 Verviicorixa Walton. Subgenotype lateralis (Leach) p. 652 Retrocorixa* Walton. Subgenotype vemista (D. and S.). Halicorixa* Walton. Subgenotype stagnalis (Leach). Phaeosigara Hungerford. Subgenotype signata (Fieb.) P- 725 Tropocorixa Hutchinson. Subgenotype promontoria (Dist.) P- 763 Utility Key to thej Genera of Corixini of the World 1. Small, shining insects less than 5.6 mm. long; males with sinistral asymmetry and with pala short, triangular, the tibia produced apically over it ; females with the apices of clavi not exceeding a line drawn through the costal mar- gins of the hemelytra at the nodal furrows Trichocorixa Kirkaldy (See key, p. 289) Not as above 2 2. (1) Interocular space as broad as or broader than an eye along rear margin. Ventral surface of hind femur pubescent only on basal fifth or fourth of the front margin and bearing two or more irregular rows of short pegs on glabrous portion. (See Plate XXXI, figs. 1 and 2.)** Male pala with pegs at distal ** ' Not represented in the Americas. Three species of Corisella {decolor, tarsalis, and mercenaria) have a single median longi- tudinal row of pegs on the ventral glabrous portion in combination with pubescence only at the base of the hind femur. 198 The University Science Bulletin end of row elongate and crowded into a double row, basal pegs elongate and spine-like 3 Not as above 4 3. (2) Anterior tibia of male overlapping base of pala; ventral glabrous portion of hind femur with numerous fine hairs interspersed among the pegs. Ectemnostega Enderlein (See p. 200) Anterior tibia of male not overlapping base of pala ; ventral glabrous portion of hind femur with pegs only Ectemnostegella Lundblad (See key, p. 206) 4. (3) Inner posterior angle of eye sharply right angulate to acutely produced; (See Plates XXXVI and XXXVIII) lower posterior angle of front femur of male produced and bearing several rows of stridulatory pegs 5 Not as above 6 5. (4) Inner posterior angle of eye acutely produced; with a pruinose area on corial side of claval suture Krizousacorixa Hungerford (See key, p. 227) Inner posterior angle of eye sharply right angulate, occasionally slightly pro- duced ; without a pruinose area on corial side of claval suture. Trichocorixella Jaczewski (See p. 236) 6. (4) Rugulose species with rear margin of head sharply curved, embracing a very short pronotum ; interocular space much narrower than the width of an eye; dorsal median lobe of the seventh abdominal segment of the male bearing a hook-like projection Palmacorixa Abbott (See key, p. 242) Not as above 7 7. (6) Smooth, shining insects, never more than faintly rugulose, ranging in size from 4 to 8.4 mm. long; lateral lobe of prothorax typically with sides tapering to a narrowly rounded ape.x; all but two small species with hind femur pu- bescent ventrally only at the base ; male pala triangular, about equal in length to tibia, with a row of pegs near dorsal margin and another in or near the upper palmar row of bristles Corisella Lundblad (See key, p. 2.59) Combination of characters not as above 8 8. (7) Length of pruinose area along claval suture less than twice the length of the distance between the shining basal apices of the corium and clavus ; with the post-nodal pruinose area (as measured from the cubital angle) shorter than or barely equal to the meron ; males without a strigil or a strigilar stalk. Centrocorisa Lundblad (See key, p. 436) Not as above 9 9. (8) Short, broad corixids, more than a third as broad as long; distal portion of corium semihyaline with color pattern often effaced ; length of pruinose area along claval suture less than twice the length of the distance between the shining basal apices of the clavus and corium 10 Not as above 11 10. (9) Middle femora of both sexes with a longitudinal groove on the ventral surface, or with a mat of straw-colored hairs distally on the inner surface; males with a strigil Pseudocorixa Jaczewski (See key, p. 408) Middle femora of both sexes with ventral surface not longitudinally grooved; males without a strigil Morphocorixa Jaczewski (See key, p. 422) 11. (9) Broad, compact species of moderate size, 5.7 to 6.5 mm. long; South American in distribution; color pattern as on Plate VI, wash drawings 33 and 34; male pala with the upper palmar row of bristles interrupted near distal end and with pegs inserted in opening in two of the three species ; (see Plate LXIX and text figure 5). Regular peg row lying near the dorsal margin of pala Neosigara Lundblad (See key, p. 429) Not as above 12 Western Hemisphere Corixidae 199 12. (11) Upper surface of male pala deeply incised; vertex of male acuminate; both sexes with palar claw serrate at base ; species less than 7 mm. long, usually with hemelytral pattern indistinct or effaced Ramphocorixa Abbott (See key, p. 448) Not as above , 13 13. (12) Males dextral, without a strigil ; hemelytral pattern always crosabanded, but with less contrast between light and dark areas than in most corixids. (See wash drawing 28, Plate VI.) Pronotum, clavus, and corium always heavily ras- trate ; male palar pegs always in two rows ; mesoepimeron at level of the scQnt gland osteole barely equal to or narrower than the lateral lobe of the prothorax ; distal portion of first tarsal segment of hind leg with a brown to black infuscation at least along margins (except in C. gebleri and C. audeni) Callicorixa B. White (See key, p. 457) Combination of characters not as above 14 14. (13) Prothoracic lobe quadrate or trapezoidal; pruinose area along claval suture very short (except in H. minorella), in any case shorter than the post-nodal pru- inose area; front tibia of male with a spiniform tuft of hairs near apex; fe- males never with anal lobes notched on ventral inner margin as in text figure 9 15 Combination of characters not as above 18 15. (14) Pronotum and hemelytra never rastrate, although anterior margin of former may sometimes be rugulose; pattern reticulate; male asymmetry sinistral and penial sheath curiously formed ; dorsal surface of the hind femur with a single row of closely set pegs Corixa Geoffroy (See Plate IV) Pronotum rastrate (except in H. laevigata) ; hemelytra rastrate. at least on clavus, if nonrastrate, then with only one or two stout pegs on dorsal surface of hind femur; pattern not reticulate, except in laevigata; male asymmetry dextral, male penial sheath normal Hesperocoriia Kirkaldy (^ Anticorixa Jaczewski) (See key, p. 49S) 16. (14) The mesoepimeron very broad with a secondary suture curving across it from the lateral bend to the inner anterior angle Xenocorixa Hungerford (See Plate VIII) The mesoepimeron, even when broad, without a secondary suture 17 17. (16) Male asymmetry sinistral, pala with a short row of pegs at base only; both sexes with the pruinose area along the claval suture narrowing abruptly be- yond the corial pruinose area for a distance at least equal to the distance between the inner and outer basal angles of the corium, Heliocorisa Lundblad (See Plate IV) Not as above 18 IS. (17) Hemelytral pattern reticulate; hemelytra and face hairy; seventh ventral ab- dominal segment of females medianly incised at tip (except in C. soreiisoni, which has the anal lobes slightly incised on inner ventral margin) 19 Not as above Stgara Fabricius (See key. p. 610) 19. (18) Elongate species with well defined median carina on pronotal disk, usually plainly visible for entire length of disk ; pronotal disk from moderately to strongly rastrate; middle leg with claw equal to the tarsus (except in A. planijrons which has pronotum strongly rastrate and carina well defined) ; male pala elongate, its dorsal edge bent inward at or slightly beyond its basal third Arctocorisa Wallengren (See key. p. oSO) Normal species with pronotal carina not so well defined, usually visible only on anterior third of disk; pronotal disk from faintly to moderately rastrate; claw of middle leg plainly longer than its tarsus; male pala broad. Cenocorixa new genus (See key, p. 564) 200 The University Science Bulletin Ectcmnostcga Enderlein 1912. Enderlein, Giinther. Kungl. Svenska Vetenskaps Akademiens Handlingar XLVIII, No. 3, p. 115. (Colored figure, PL 3, fig. 38, and text fig. 28.) 1928. Limdblad, O. Ent. Tidskrift XLVIII, Hiift 4, p. 222. (Compares with .Veo- sigara.) 1928. Jaczewski, T. Annales Musei Zoologici Polonici VII, pp. 53-56, PI. III. 1928. Jaczewski, T. Annales Musei Nat. Hongarici XXV, p. 214. (Reports Patagonia.) 1928. Lundblad, O. Zoolog. Anzeiger LXXIX, Hiift 5-6, pp. 153-154. 1935. Poisson, R. Archives de Zool. Exp. et Gen. LXXVII, p. 458. Medium-f^ized corixids with eyes relatively small and the inter- ocular space very broad. Postocular space broad. Anterior rostral surface with transverse sulcations. Face flattened in female, con- cave in male; hairy in both sexes. Pronotum and hemelytra roughened, rugulose to faintly rastrate. Hemelytra with scattered fine hairs, the membrane not separated from the corium, the em- bolial margin emarginated, suddenly explanate before the nodal furrow in the female, but slightl}^ so in the male. Lateral lobe of prothorax tongue-like, broadest at base, gradually tapering and rounded at the end. The tibia of the front leg of the male over- lapping the base of the pala. The palar pegs of male more or less bristle-like and crowded into a double row at distal end. Metaxyphus short. Asymmetry of male dextral; strigil present. Doctor Jaczewski says this genus appears to be primitive and nearer Glaenocorisa Thomson than Cymatia Flor. Ectemnostega quadrata (Signoret) (Plate XXXI, figs. 2. 2a-2h ; also wash drawing No. 6, Plate IV) 1885. Corixa quadrata Signoret, V. Annales de la Soc. Ent. rie France, V (scr. (i), pp. 68-69. (Desc. from "Terre de Feu, Chili.") 1888. Corixa quadrata, Signoret, V. Miss. Cap. Horn, Heniiptera, p. (1. 1895. Corisa quadrata. Berg, C. Anales Mus. Nac. Buen. Aires IV, p. 196. (Name only.) 1897. Corixa quadrata, Breddin, G. Hamburger Magalhaensische Samnielreise, Heniip- tera, pp. 13-14, figs. 5, 5a-c. (Desc. both sexes and dimorphism.) Material collected by Doctor Michaelsen from "Magalhaens Str." and "Uschuaia." 1912. Ectemnostega quadrata, Enderlein, Giinther. Kungl. Svenska Vetenskaps Akademi- ens Handlingar XLVIII, No. 3, pp. 115-116. (PI. Ill colored fig. 38, text fig. 28.) (Studied 12 specimens taken from two ponds, one entirely covered with ice, 3-10-1902. "Halbinsel siidwestlich von Uschuaia.") 1927. Ectemnostega quadrata, Jaczewski, T., Ent. Tidskrift, XLVIII, No. 3, pp. 146- 149, figs. 1-6 (splendid redescription). 1928. Ectemnostega quadrata, Jaczewski, T. .Annales Miisei Nat. Hungarici XXV, p. 214. (Reports from Patagonia.) Size: Length 6 mm. to 6.7 mm. Width of head 2 mm. to 2.35 mm. Color: General facies brown. Head yellow to yellowish brown, its caudal margin embrowned to black. Venter and legs yellow. Tlie ends of middle tarsi darkened and abdominal venter of male darker than in female. The ground color of pronotum and hemely- tra light brown; the pronotum crossed by eight or nine slender, Western Hemisphere Corixidae '201 broken and overlapping impressed black lines. The light brown and dark brown figures on hemelytra about equal except at base of clavus where the dark bands are a little narrower. On the remain- ing portions of the hemelytra the lines are less regular, zigzag-like, here and there broken up and furcated with no indication of a line between corium and membrane; embolium pale, may be darkened at nodal furrow. Structural characteristics: Head almost equally shaped in both sexes. Frontal arch in both sexes distinctly, although not exactly strongly, prominent between the eyes, forming a somewhat flattened, slightly convex line. Synthlipsis wide, wider than an eye. Post- ocular space broad as in Cymatia and Glaenocorisa. Face concave in the male, flattened in the female; in both sexes densely covered with long hair. Third antennal segment twice as long as the fourth. Head, when seen from above, nearly equal in length to the pronotal disk which is about twice as wide as long. Lateral angles of pro- notal disk more or less rounded. Lateral lobes of the prothorax wide at their base, gradually tapering and rounded at the end. Pro- notal keel indistinct. Pronotal disk and hemelytra roughened, rugu- lose to faintly rastrate. Hemelytra wnth fine scattered hairs. Em- bolar margin emarginated anteriorally, suddenly explanate before the nodal furrow in the female, but slightly so in the male. Pruinose area beyond the nodal furrow rather narrow and pointed distally and equal in length to pruinose area along the claval suture. Me- soepimcron narrow with osteole of scent gland near its tip. Meta- xyphus rather short, almost cquilaterally triangular. Front leg: The femur of the male sparsely armed with short spines and hairs; about the center of its front surface a more dense group of short spines, obliquely extended. Tibia distinctly swollen toward the apex and somewhat twisted there, overlapping exteriorly the base of the pala. Pala rather narrow, its upper margin with a strong tubercle at the base, further forming a somewhat irregular arch. Inner palmar margin convex with about 16 rather remotely inserted bristles. The peg row lies along the inner margin of the palm and at distal end is crowded into two rows, the lower ones long and bristle-like, the basal portion of the row consists of long white, bristle-like hairs interspersed with shorter ones. The front tibia of the female simple, pala shaped like that of the male but lacking, of course, the pegs. Middle leg: femur : tibia : tarsus : claw : : 100 : 53.6 : 40.6 : 42. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 105.4 : 202 The University Science Bulletin 121.6 : 62.2. On the upper surface of the hind femur an elongated group of about 30 short spines. The strigil of the male is compara- tively small, with about 6 rather irregular combs.* The male geni- tal capsule and claspers as shown on Plate XXXI, figs. 2e, and 2g. Location of types: The type is a male in the Paris Museum and bears the following labels: "Museum Paris, Arch, du Cap. Horn Bale Orange, Hyades and Hahn 1885" and "Corixa quadrata type n. sp., C. Horn. Signoret." I examined it in 1928. The specimen is a brachypterous form, having hind wings reduced. In the museum at Hamburg I found Breddin's specimens. One female labeled "130 Uschuaia, Corixa quadrata Sign, form volatilis nova" and "130 Uschuaia Siisswasser. See auf d. Halbinsel, 19-XI-1892. Coll. Michaelsen." This is his type of winged form. Another with re- duced flight wings is labeled "form aptera." A male is also labeled "form aptera" and the genital capsule shown on Plate XXXI is from this. Data on distribution: (Plate XXXV). The type came from Fireland. Breddin, 1897, reported on a collection in the Hamburg Museum collected by Doctor Michaelsen and recorded it as follows: "Coll. Mich. 66 Magalhaens Str., Aqua Fresco; X-92 (Delfin leg.)"; "Coll. Mich. 78 Magalhaens Str., Punta Areanas, grosser Bergsee, ca. 300 m. hoch, 10, III, 93"; "Coll. Mich. 130 Uschuaia, Siiss- wasser-See auf der Halbinsel 19, XI, 92"; "Coll. Mich. 131 Uschuaia Susswasser-See auf der Halbinsel, 13, XII, 92"; "Coll. Mich. 135 Uschuaia Siisswasser-Teich vor der Halbinsel, 2, XII, 92." He de- scribed both brachypterous and fully winged forms. Enderlein, 1912, who proposed the genus, studied 12 specimens taken 3, 10, 1902, from "Halbinsel siidwestlich von Uschuaia" in two fresh water ponds, one of which was entirely and the other only partly covered with ice. Jaczewski, 1928, records a male from Patagonia in the Hungarian Museum. The species is found then at the southern tip of South America in the rigorous cold climate of Tierra del Fuego, and Doctor Michaelsen collected specimens in the Antarctic summer months, taking both sexes in October and November, females and eggs on a Ceratophyllum-like plant in December and adults of the new generation in March. This description diawa largely from Jaczewski, 1927. Western Hemisphere Corixidae 203 Ectemnostega darwini n. sp. (Plate XXXI, figs. 1, la-Id) Size: Length 7.8 mm. ( 5 ). Width across eyes 2.43 mm. ( ? )• Color: General facies medium brown. Pronotum crossed by 12 to 14 narrow, very irregular brown lines, tending to coalesce laterally on the distal half of the disk. Claval lineations plainly transverse on basal third, more broken and irregular distally. Corial pattern irregularly transverse, the dark lineations much interrupted, but extending to the lateral margin of wing beyond the embolar groove. Pattern continuous over membrane. Embolium, head, limbs, and distal segments of abdomen pale; venter of thorax and basal seg- ments of abdomen smoky. Structural characteristics: Since the specimen we have before us is macropterous, the head is shorter than the pronotal disk. Inter- ocular space very broad, one and one-half times the length of the rear margin of an eye; postocular space broad; vertex produced; face rather hairy, transversely depressed just above the beak, and slightly flattened. Pronotal disk as pictured on Plate XXXI, fig. Ic. Disk and clavus moderately rastrate; corium rugulose to faintly rastrate at base; corium with a few scattered pale hairs. Post-nodal pruinose area slightly shorter than that of the claval suture. Embolar margin emarginated as in E. quadrata (Sign.), suddenly explanate before the nodal furrow. Lateral lobe of the prothorax broad at base, sides gradually tapering to rounded apex. Mesoepimeron narrow with osteole almost at tip. Since this specimen was pinned through the metaxyphus we cannot describe that structure. Pala of female with 15 to 16 lower palmar hairs; distal end of pala somewhat blunter than in E. quadrata (Sign.). Middle and hind legs slender; hind femur as shown on Plate XXXI, fig. 1. Relative proportions of segment as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 59.9 : 48.4 : 48.4. Hind leg: femur : tibia (last two seginents missing) : : 100 : 91.1. Venter of female abdomen as on Plate XXXI, fig. lb. Comparative notes: This female is a damaged specimen. I have compared it with all the Ectemnostegella species as well as with Ectemnostega quadrata. While its general facies is that of Ectem- nostegella, the explanate margin of the hemelytra and the presence of some hairs on the shining area of the under surface of the hind femur suggest the genus Ectemnostega. It is somewhat intermediate between the two genera and only the discovery, of males will de- 204 The University Science Bulletin termine its proper place. The only Ectemnostegella with a com- parably broad postociilar space is E. jamesi Hungerford, the surface of which is roughened and which has a coarser and more definitely transverse pattern. The pattern of E. darwini is like that of Ectem- nostegella pilosafrons, from which it differs in having a broader inter- ocular space, a much broader postocular space, and the suddenly explanate margin of hemelytron. The differences between the females of E. darwini and E. quadrata are shown on Plate XXXI. Location of type: Holotypc female, labeled "Santa Cruz, Pata- gonia, C. Darwin" in the British Museum. Data on distribution: (Plate XXXV.) Known only by the type. PLATE XXXI Eciemnostega Enderlein Fig. 1. Eciemnostega darwini n. sp.; ventral view of hind femur of female. Fig. la. Dorsal view of head of female. Fig. lb. Ventral view of female abdomen. Fig. Ic. Pronotal disk of female. Fig. Id. Costal margin of left hemelytron of female. Fig. 2 Eciemnostega qiuidrata (Signoret); ventral view of hind femur of female. Fig. 2a. Dorsal view of head of female. Fig. 2b. Ventral view of abdomen of female. Fig. 2c. Pronotal disk of female. Fig. 2d. Costal margin of left hemelytron of female. Fig. 2e. Genital capsule of male (drawn by Hungerford in Europe from the type). Fig. 2f. Tibia and pala of male front leg (modified after Jaczewski's draw- ing from Hungerford 's notes on the type). Fig. 2g. Left clasper of capsule (after Jaczewski). Fig. 2h. Right .side of male abdomen, showing strigil (after Jaczewski). Western Hemisphere Corixidae 205 PLATE XXXI 2. Ectemnostega quadrata (Sign) I. Ectemnostega darwini n. sp. 206 The University Science Bulletin The Genus Ectemnostegella Lundblad 1928. Lundblad, O. Zool. Anzeiger LXXIX, Heft 5-6, p. 153. 1928. Lundblad, O. Ent. Tidskrift XLVIII, Haft 4, p. 222 (remarks). 1935. Poison, R. Archives de Zool. Exp. et Gen. LXXVII, p. 458. Interocular space wider than an eye;* postocular' space broad, at least at inner angle of the eyes. Face of female flattened and hairy; that of male, except in two species, with a deep depression and few hairs. Vertex distinctly produced in both sexes, but more so in males. Hemelytral pattern vermiculate, without a line of demarcation between corium and membrane. Lateral lobe of the prothorax with sides tapering from base to blunt apex. Tibia of front leg in male not produced over pala. Male pala with pegs at distal end crowded into a double row, basal pegs elongate and spinelike. Hind femur with the pubescent area restricted to a narrow border at base and along the rear margin; ventral surface bearing several rows of short spines on distal half in both sexes. (See fig. 2d, Plate XXXII.) Genotype E. montana Lundblad. This genus is very closely related to Ectemnostega Enderlein, the genotype of which occupies the southern tip of South America. Ectemnostegella is found in the mountainous regions of Argentina, Bolivia and Peru. A single species, new in this paper, occurs in Argentina near Buenos Aires. Key to Ectemnostegella Lundblad 1. Width of the interocular space greater than the length of the pruinose area along the claval suture 2 Width of the interocular space equal to or less than the length of the pruinose area along the claval suture 4 2. (1) Length of the pruinose area along claval suture greater than the posterior width of an eye E. lundbladi n. sp. (p. 207) Length of the pruinose area along claval suture shorter than the posterior width of an eye 3 3. (2) Nodal furrow indistinct, but dividing embolar groove into two nearly equal parts ; the nieron about half as long as the postnodal pruinose area as measured along the costal margin E. jamesi n. sp. (p. 208) Nodal furrow distinct, situated well beyond middle of the embolar groove ; the , meron equal to the postnodal pruinose area as measured along the costal margin E. tumidacephala n. Bp. (p. 210) 4. (1) Interocular space equal to the width of an eye E. venturii n. sp. (p. 211) Interocular space greater than the width of an eye 5 * Except in E. venturii n. sp. where it is only as wide as an eye, in females at least. Western Hemisphere Corixidae 207 5. (4) Greatest width ef the shining costal margin just anterior to the nodal furrow equal to the width of the postocular space at the inner angle of the eye. . E. woytkowskii n. sp. (p. 213) Greatest width of the shining costal margin just anterior to the nodal furrow about half the width of the postocular space at the inner angle of the eye. . . 6 6. (5) Lateral lobe of prothorax with both margins tapering (see Plate XXXIII, fig. 3a), almost as broad at base as long ; vertex of males and females not conical, even when produced 7 Lateral lobe of prothorax with anterior margin nearly straight (see Plate XXXIII, fig. 4a), longer than the base is broad ;' vertex of both sexes coni- cally prodi,:ced ; pala of male short and broad E. peruana Jacz. (p. 214) 7. (6) Face of male very hairy; face of female depressed and very hairy; male with- out a stridular area at base of front femur E. pilosafrons n. sp. (p. 215) Face of male with few hairs ; face of female, if depressed, then not hairy ; if hairy, then not depressed ; males with a stridular area 8 8. (7) Vertex of male as on Plate XXXIII, fig. lb; female face depressed but not hairy E. stridulata n. ep. (p. 216) Vertex of male as on Plate XXXII, fig. lb ; female face hairy but not de- pressed E. montana Lundblad (p. 218) Ectemnostegella litndbladi n. sp. (Plate XXXIV, figs. 1, la-Id) Size: Length 6.3 mm. to 7.3 mm. Width across eyes 2.1 mm. to 2.3 mm. Color: General facies dark. Pronotum crossed by about 18 nar- row, irregular dark lines in macropterous forms. In our collection there are no brachypterous forais; however, since both forms occur in other species of this genus, it is only reasonable to suppose that they also occur in this species. Color pattern on hemelytra appear- ing mottled, the dark color in short vermiculate, somewhat trans- verse series, and dominant over the light. Pattern of membrane continuous with that of corium, except for clear line down center of membrane in some specimens. Embolium pale to slightly infus- cated; head and limbs pale; venter dark, tip of abdomen pale in some specimens. Structural characteristics: Head about two-thirds as long as pro- notal disk; vertex conically produced in both sexes; interocular space almost twice the width of an eye and its width greater than the length of the claval pruinose area; postocular space relatively narrow; male fovea broad and deep; face of male sparsely haired, that of female flattened and hairy; antennal segmentation: 1:2: 3 : 4 : : 20 : 15 : 35 : 28 ^^ ; 1 : 2 : 3 : 4 : : 20 : 18 : 38 : 30 ? . Pronotum with median carina visible throughout but most distinct on anterior third; pronotum finely rastrate; hemelytra rugulose, 208 The University Science Bulletin shining, with a few long, pale hairs on coriuni and membrane. Pni- inose area of the embolar groove posterior to the nodal furrow equal in length to that of the claval suture. Lengtli of the claval pruinose area greater than the posterior width of an eye. Lateral lobe of the prothorax broadest at base, tapering distally to rounded point. Mesoepimeron narrow with osteole near its tip; metaxyphus about as broad at base as long, pointed distally. Foreleg of female of typical shape. Foreleg of male: femur relatively slender without a stridular area and w'ith a row of stout hairs along inner surface on distal portion ; tibia with several long, spine-like hairs on inner sur- face and with a projection-bearing pad on distal margin; pala with 5 or 6 pegs in upper distal row and 16 short and 5 long pegs in lower row. Middle and hind legs relatively slender. Comparative measurements: middle leg: femur : tibia : tarsus : claw :: 100 : 50.1 : 38.5 : 38.5 ; hind leg : femur : tibia : tarsus 1 : tarsus 2 : : 100 : 90.6 : 113 : 38.8. Strigil elongate, of IVo combs, and bearing extra long spines on inner portion as on Plate XXXIV, fig. lb. Outer margin of the left lobe of the eighth abdominal segment in- cised. For details of male structures see Plate XXXIV, figs. 1, la-Id. Comqmrative notes: This is a dark species with the dark colora- tion dominant over the pale. In addition, the males may be dis- tinguished by the peculiar strigil consisting of a solid plate which bears one and a half rows of extra long spines and some stouter ones mesally from the anterior end of the strigil. Location of types: Holotype male, allotype female, 9 male and 20 female paratypes labeled "Peru, S. A., Dept. of Huanuco, vie. of Shishmay, Andes 3600-4100 m., highland lakes, Sept. 15-20, 1937, F. Woytkowski"; all forms macropterous. Data on distribution: (Plate XXXV.) Besides the type series we have the following records (all macropterous) : Peru, South America: Dept. of Junin, lakes 10 km. n. w. of Huasakuasi, 4,100 m. above sea level, April 14, 1940, F. Woytkow- ski, 29 males, 30 females (these specimens heavily parasitized) ; Dept. of Ayachuco, Prov. Huanta, Andes, 2,800 m. above sea level, from ponds. Mar. 20, 1941, F. Woytkowski, 2 males, 1 female. Ectemnostegella jamesi n. sp. (Plate XXXIII, figs. 2, 2a-2c) Size: Length 6.5 mm. Width across eyes 2.2 mm. Color: General facies medium brown, head testaceous. Pronotum crossed by 8 to 10 very narrow, irregular dark lines, much more Western Hemisphere Corixidae 209 broken and irregular on distal than on basal portion. Clavus with darker pattern almost obliterated on basal portion; elsewhere on clavus and on corium pattern is almost continuous across sutures and about equally distributed between dark and light, except at distal end of embolar groove and inner distal angle of corium which are dark. Membranal pattern continuous with that of corium. Pattern of hemelytra irregular throughout, but more or less transverse in thin, wavy, dark lines. Limbs and thorax testa- ceous; basal segments of abdomen almost black, distal segments and margins pale testaceous. Structural characteristics: Flight wings reduced. Head about one and one-half times as long as pronotal disk; interocular space a little greater than the width of an eye and its width greater than the length of the claval pruinose area; i^ostocular space very broad (see fig. 2b, Plate XXXIII); vertex rounded and considerably produced; face of male flattened only, the fovea barely distinguish- able; face quite hairy. Antennal segmentation: 1 : 2 : 3 : 4 : : 15 : 20 : 45 : 20 J^ . Pronotum a little more than twice as broad as long, slightly carinate basally on median portion; pronotum and hem- elytra so heavily rastrate as to appear pebbled; hemelytra with- out hairs. Embolium w^ith nodal furrow indistinct; it can be de- tected, however, and divides the embolar groove into two equal parts. The pruinose area beyond the nodal furrow about twice as long as that of claval suture. Length of the claval pruinose area shorter than the posterior width of an eye. Lateral lobe of pro- thorax broad at base, tapering distally, apex rounded; mesoepimeron narrow with osteole near its end; metaxyphus a little longer than broad, pointed distally. Foreleg of male: femur relatively stout, without a strigilar area, and with several stout hairs on distal por- tion of inner surface; tibia with several long, spinelike hairs on inner surface and with a pad distally beneath a distinct ledge; pala with 9 pegs in upper distal row, and with 7 to 8 long and 14 to 15 short pegs in lower row. (See fig. 2, Plate XXXIII.) Middle leg relatively stout, with long, slender hairs on anterior margin; hind leg moderately stout; comparative measurements: ]\Iiddle leg: femur : tibia : tarsus : claw : : 100 : 37.7 : 29.9 : 37.7; hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 83.9 : 111.8 : 44.3. Strigil large, triangular, of 7-8 combs. For details of male structures, see Plate XXXIII, figs, 2, 2a, 2b and 2c. Comparative notes: This species can be distinguished from all others in the genus by having the nodal furrow indistinct and 14—822 210 The University Science Bulletin dividing the embolar groove into two nearly equal parts. Like E. pilosafrons n. sp., this species has a shallow fovea and a hairy face in the male, but may be distinguished from the above-mentioned species by the characteristics listed above. Location of types: Holotype male (brachypterous), labeled "Lake Titicaca, Bolivia, Jan. 18, 1936, H. M. James," in the Francis Hunt- ington Snow Entomological Collections, University of Kansas, Law- rence, Kansas. Data on distribution: (Plate XXXV.) Known only by the type. Ectemnostegella tutnidacephala n. sp. (Plate XXXIV, fig. 2, 2a-2d) Size: Length 5.3 mm. Width across eyes 1.8 mm. Width across pronotum 1.6 mm. Coloi\- General facies very dark. Pronotum dark, crossed by six or eight obscure pale lines, very irregular. Dark pattern of hemely- tra dominant and arranged in somewhat transverse series, especially on clavus. Pattern of membrane continuous with that of corium. Dorsum of head dark, with a median brown stripe; venter of head, limbs, and thorax pale; abdominal venter and embolium dark. Strncturol characteristics: Macropterous. Head almost as long as the pronotal disk and considerably wider; postocular space broad at inner angles of eyes; interocular space only slightly greater than the width of an eye and its width greater than the length of the claval pruinose area; vertex produced; eyes protuberant; antennal segmentation: 1 : 2 : 3 : 4 : : 20 : 15 : 35 : 20 ^ . Pronotum with median carina faintly visible on anterior margin. Pronotum and hemelytra shining, faintly rugulose. Nodal furrow distinct; prui- nose area of the embolar groove posterior to the nodal furrow about equal to that of the claval suture. Length of the claval pruinose area shorter than the posterior width of an eye. Lateral lobe of the prothorax broadest at base, tapering to tip; mesoepimeron nar- row with osteole near the tip; metaxyphus as broad as long. Fore- leg of male: femur slender, with a row of spine-like hairs along inner surface; tibia slender with 2 or 3 long hairs on inner surface and a projection-bearing pad on distal margin; pala spoonlike with 4 pegs in upper distal row and 5 long and 15 short pegs in lower row. Middle and hind legs relatively slender; comparative measurements of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 51.6 : 39.3 : 43. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 97 : 121.2 : Western Hemisphere Corixidae 211 45.5. For details of male structures see Plate XXXIV, figs. 2, 2a, 2b, 2c, and 2d. The strigil has two combs of nearly equal length. Outer margin of left lobe of eighth segment incised. Comparative notes: This species can readily be distinguished from its fellows by having the head considerably wider than the pro- notal disk and protuberant eyes. Location of types: Holotype male, in the Francis Huntington Snow Entomological Collections, University of Kansas, Lawrence, Kansas. Data on distribution: (Plate XXXV.) Described from one ma- cropterous male specimen taken Dept. of Huanuco, vie. of Shish- may, Andes, 3,600-4,100 m., highland lakes, Peru, Sept. 16-20, 1937, Felix Woytkowski. Ectejnnostegella venturii n. sp. (Text fig. 3, p. 212) Size: Length 5.7 mm. to 6.2 mm. females. Width across eyes 1.97 mm. to 2.2 mm. females. The smaller female is brachypterous, the larger macropterous. Color: General facies medium to raWier dark. Pronotum crossed by 11 to 14 narrow, irregular dark lines which appear depressed. Clavus and corium with dark pattern fine and irregularly trans- verse. Dark pattern on base of membrane transverse, continuous with that of corium; pattern on distal portion reticulate; mem- brane indistinctly separated from the corium. Prenodal portion of embolar groove smoky to black in macropterous form, pale through- out in brachyterous form. Head and limbs pale in both forms; venter pale in brachypterous specimen, smoky to black in the other. Structural characteristics: Head (brachypterous form) as com- pared to pronotal disk :: 1.5 : 2; macropterous form : : 1.5 : 2.5. Postocular space moderately broad and of uniform width to lateral curve of eye ; interocular space equal to the width of an eye and its width less than the length of the claval pruinose area; vertex rounded; face hairy, depressed and rather short; antennal segmenta- tion: 1 : 2 : 3 : 4 : : 22 : 18 : 38 : 22 $ . Width of pronotal disk to length (brachypterous forai) :: 100 : 47.6; macropterous form :: 100 : 52.3. Pronotum and clavus finely rastrate; basal portion of corium rugulose to faintly rastrate ; membrane and distal portion of corium shining. Postnodal pruinose area equal in length to that of the claval suture. Lateral lobe of prothorax about as broad at base as long, sides tapering, tip oblique with anterior angle longer than 212 The University Science Bulletin posterior angle; mesoepimcron narrow with osteole almost at tip; metaxyphus as broad as long, sides tapering to bluntly pointed apex. Front leg of female normal, the pala with 18 to 20 lower palmar hairs. Middle and hind legs relatively slender; hind femur pubes- cent at base, glabrous portion with pegs confined to distal half (see text figure) ; proportions of segments: Middle leg: femur : tibia : tarsus : claw : : 100 : 43.5 : 30.45 : 36.3. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 92.2 : 107.5 : 35.8. Female ab- domen normal; the seventh ventral segment with distal margin almost straight and anal lobes short. Comyarative notes: The fact that the interocular space is equal to the width of an eye will separate this species from the Ectem- nostegella species thus far described. Location of types: Holotype female labeled "Rep. Argentina, Prov. Buenos Aires, Sept. 26, 1898, S. Venturi," in the Museo Nacional de Historia Natural, Buenos Aires. One female paratype with same data in the Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate XXXV.) Known to us only by the type series. • Fig. 3. Ectemnostegella venturii n. sp. (1) left hemelytron of female; (2) pronotal disk, brachypterous form; (3) ventral view of female abdo- men; (4) head and pronotal disk, macropterous form; (5) lateral view of head; (6) venter of hind femur. Western Hemisphere Corixidae 213 E ctemnostegella woytkowskii n. sp. (Plate XXXII, figs. 3, 3a to 3c) Size: Length 7.4 mm. to 7.8 mm. Width across eyes 2.2 mm. to 2.6 mm. Color: General facies a little lighter than medium. Pronotum crossed by about a dozen narrow, irregular dark lines. Pattern on basal portion of clavus transverse; pattern elsewhere more broken and irregular, with light coloration dominant over the dark. Corium and membrane not separated. Embolium, head, and limbs pale; venter pale in females, usually dark in males. Structural characteristics: Brachypterous. Head slightly longer than the pronotal disk; postocular space rather broad; interocular space not greatly exceeding the width of an eye, and its width less than the length of the claval pruincse area; vertex of male conically produced, that of female produced but rounded; male fovea broad and deep; vertex of male pointed in lateral view; antennal segmen- tation as follows: 1 : 2 : 3 : 4 : : 25 : 20 : 38 : 20 j ; 1 : 2 : 3 : 4 : : 30 : 20 : 40 : 20 5 . Pronotum without a median carina ; pro- notum and hemelytra heavily rastrate, appearing pebbled. Pruinose area of the embolar groove posterior to the nodal furrow only about half as long as that of the claval suture. Greatest width of the shin- ing costal margin of wing just anterior to nodal furrow equal to the width of the postocular space at the inner angle of the eye. Lateral lobe of the prothorax about as broad at base as long, tapering to tip. Mesoepimeron narrow with osteole near the tip; metaxyphus arrow-shaped, slightly longer than broad. Foreleg of female of usual shape. Foreleg of male: femur rather stout, base pilose, inner surface with a short row of short, spinelike hairs; tibia rather stout and broad in dorsal view, without spines or pad; pala spoon-shaped with d-stal portion expanded and broadened as viewed from the end, 5 pegs in upper distal row, and 3 long and 13 short pegs in lower row. Middle and hind legs relatively slender; hind femur with numerous short spines on distal half of ventral surface. Compara- tive measurements of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 42.5 : 34.3 : 37; hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 85.7 : 119 : 40.5. Strigil small, of 3 (ombs. For details of male structures see Plate XXXH, figs. 3, 3a, 3b. and 3c. Comparative notes: In this species the greatest width of the shininv: costal margin just anterior to the nodal furrow is equal to the wdili of the postocular space at the inner angle of the eye, by 214 The University Science Bulletin which characteristic it may be distinguished from others in the genus. Location of types: Holotype male, allotype female, and 20 male and 12 female paratypes, labeled "near Concepcion, Andes, 3,260 m. above sea, near or in Rio'Mantaro, Peru, S. A., April 7-8, 1935, Felix Woytkowski," in the Francis Huntington Snow Entomological Collections, University of Kansas, Lawrence, Kansas. Data on distribution: (See Plate XXXV.) Known only by the types series. Ectemnostegella peruana Jacz. (Plate XXXIII, figs. 4-4a; Plate XXXII, figs. 2, 2a-2d; Plate XXXIV, fig. 4) 1933. Ectemnostegella peruana Jaczewski, T. Ann. Mus. Zool. Polonici IX, No. 21, pp. 329-331, PI. XLVI, figs. 1, 3-5. Size: Length 5.9 mm. to 6.8 mm. Width across head 1.8 mm. to 2.1 mm. Color: General facies medium brown. Pronotum in brachyp- terous form with about 12 narrow, irregular crossbands; in macrop- terous fonn with about 15 to 16 narrow, irregular crossbands. Dark pattern at base of clavus entire and transverse; elsewhere on hem- elytra the dark pattern consisting of narrow, irregular maculations, more or less transverse, and about equal in distribution to the pale areas; dark pattern a little thicker on corium and membrane than on clavus where pale coloration is plainly dominant. No mem- branal line present. Head, limbs and embolium pale; venter dark. • Structural characteristics: Head a little longer than the pronotal disk in brachypterous forms; in macropterous forms slightly shorter than the disk ; postocular space broad at inner angle of eyes ; inter- ocular space considerably broader than the width of an eye and its width equal to or less than the length of the claval pruinose area; vertex conically produced in both sexes; vertex of male pointed in lateral view, fovea broad and deep, attaining eyes laterally; an- tennal segmentation: 1 : 2 : 3 : 4 : : 22 : 12 : 32 : 18 ^^ ; 1 : 2 : 3 : 4 : : 25 : 15 : 35 : 20 5 . Pronotum without a carina ; pronotum finely rastrate, hemelytra faintly rugulose, shining. Pruinose area of the embolar groove posterior to the nodal furrow equal in length to that of the claval suture in males; in females, shorter than that of the claval suture. Lateral lobe of the prothorax longer than base is broad and with anterior margin nearly straight; mesoepimeron narrow with osteole near the tip; metaxyphus about as broad at base as long, arrow-shaped. Foreleg of female of typical shape. Foreleg of male: femur relatively slender with a raised place on Western Hemisphere Corixidae 215 inner surface covered with fine hairs; tibia slender with a pad on distal margin; pala short and broad, with 5 or 6 long pegs in upper distal row, and 7 long and 11 or 12 short pegs in lower row. ]\Iiddle and hind legs slender. Comparative measurements of segments as- follows: middle leg: femur : tibia : tarsus : claw :: 100 : 51.7 : 38.3 : 42.4; hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 95.6 : 107.4 : 48.5.* Strigil rounded, of 4 regular combs. For de- tails of male structures see Plate XXXII, figs. 2, 2a, 2b, 2c and 2d. Dorsal view of female abdomen as on Plate XXXIII, fig. 4. Comparative notes: The short broad pala of the male and the shape of the prothoracic lateral lobe will distinguish this species. Location of types: Described from 2 males, 9 females from Peru, Santa Rosa de Ocopa, 3,270 m. above sea level, all brachypterous, and 1 male and 3 females, Peru, Huancayo, about 3,000 m. above sea level, all brachypterous. A male from Santa Rosa de Ocopa was chosen as holotype. Tyi>es in the Polish Museum at Warsaw. Data on distribution: (Plate XXXV.) In the Snow Collections we have the following specimens: Peru, South America: Near Concepcion, And^s, 3,260 meters, Rio Mantaro, April 13-15, 1935, Felix Woytkowski, 13 males (4 macropterous), 22 females (4 macropterous) . Ectemnostegella pilosafrons n. sp. (Plate XXXIV, figs. 3, 3a-3d) Size: Length 7 mm. to 7.6 mm. Width across eyes 2.1 mm. to 2.3 mm. Color: General facies medium brown. Pronotum of macropterous form with about 14 narrow, irregular dark lines. (No brachypterous form in collection.) Clavus with dark pattern transverse on basal portion; elsewhere on clavus and on corium dark pattern consists of short, irregular, faintly transverse, vermiculate lines, a little narrower than intervening pale areas so that the latter are domi- nant. Pattern of membrane continuous with that of the corium. Embolium infuscated at least on basal third and sometimes through- out. Head and limbs pale, venter black. Structural characteristics: Macropterous. Head two-thirds as long as pronotal disk ; postocular space relatively narrow ; interocular space only a little greater than the width of an eye and its width less than the length of the claval pruinose area ; vertex, from above, * Jaczewski's figures. Our specimens show considerable variation. The claws of middle leg often shorter than tarsus. 216 The University Science Bulletin only slightly produced; male vertex in lateral view rounded, the fovea barely distinguishable; face hairy in both sexes, that of fe- male depressed ; antennal segmentation : 1 : 2 : 3 : 4 : : 20 : 15 : 35 : 20 J ; 1 : 2 : 3 : 4 : : 20 : 18 : 38 : 20 5 . Pronotum with median carina faintly visible on anterior portion. Pronotum finely rastrate, hemelytra rugulose. Pruinose area of the embolar groove posterior to the nodal furrow slightly shorter than that of the claval suture. Lateral lobe of the prothorax broad basally, tapering to tip. Meso- epimeron narrow with osteole near its tip. Metaxyphus arrow- shaped, about as broad at base as long. Foreleg of female of usual shape. Foreleg of male: femur relatively slender, with pilose area on inner surface near base succeeded by row of spine-like hairs; tibia slender, with some spines and with a projection-bearing pad distally; pala spoon-shaped with 5 to 6 long pegs in upper distal row, and with 6 to 7 long and 14 to 16 short pegs in lower row. Middle and hind legs relatively slender. Comparative segmenta- tion as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 48.9 : 36.9 : 39.4; hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 96.4 : 120.7 : 39.9. Strigil of moderate- size, 4 or 5 combs. For details of male structures see Plate XXXIV, figs. 3, 3a, 3b, 3c and 3d. Comparative notes: The males of this species are readily distin- guished from all their fellows except E. jamesi n. sp. by having a shallow fovea and a hairy face; from jamesi the males may be separated by having a distinct nodal furrow and a narrow postocular space. Females may be distinguished from those of stridulata n. sp. and peruana Jacz. by having the interocular space only slightly greater than the width of an eye. Location of types: Holotype male, allotype female, and 13 male and 12 female paratypes, labeled "Cajamarca, Peru, river Chonta, June 11, 1946, F. Woytkowski," all macropterous, in the Francis Huntington Snow Entomological -Collection, University of Kansas, Lawrence, Kansas. Date on distribution: (Plate XXXV.) Known only by the type series. Ectemnostegella strididata n. sp. (Plate XXXIII, figs. 1, lu-lc, 8; wash dnnvincr No. 3, Plalf IV) &ize: Length 6.7 mm. to 7 mm. Width across eyes 1.9 nun. to 2.2 mm. Color: General facies medium brown. Pronotum crossed by 15 or 16 narrow, broken, irregular dark lines. Dark pattern somewhat Western Hemisphere Corixidae 217 etched out on inner basal angle of clavus. Pattern elsewhere on hemelytra of short, irregular, dark maculations about equal in area to pale markings. Membrane and corium not separated. Embolium, head and limbs pale. Venter dark. Structural characteristics : Macropterous. Head about four-fifths as long as the pronotal disk ; postocular space broad at inner angles of eyes; interocular space only slightly greater than the width of an eye and its width less than the length of the claval pruinose area; vertex of male considerably produced in dorsal view and appearing pointed in lateral view; vertex of female slightly produced; face of female hairy, face of male not hairy; antennal segmentation: 1 : 2 : 3 : 4 : : 20 : 18 : 32 : 20 J ; 1 : 2 : 3 : 4 : : 20 : 18 : 35 : 20 5 . Pronotum with faint median carina on anterior margin. Pronotum finely rastrate, hemelytra rugulose. Pruinose area of the embolar groove posterior to nodal furrow slightly shorter than that of the claval suture. Lateral lobe of the prothorax tapering from base to apex and nearly as broad basally as long; mesoepimeron narrow with osteole near the tip; metaxyphus about as broad as long, arrow-shaped. Foreleg of female normal. Foreleg of male: femur relatively stout, with a slight stridular area, though not so pronounced as in E. montana Lundbl. ; tibia slender, without spines or pad; pala spocnlike, dorsal side somewhat flattened, with 5 pegs in upper distal row, and 4 to 5 long and 12 short pegs in lower row. Middle and hind legs relatively slender. Proportional measure- ments as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 48.3 : 35.4 : 35.4; hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 90.9 : 107.8 : 44. Strigil minute, of 3 combs. For details of male structure see Plate XXXIII, figs. 1, la, lb, Ic and 3. C omparative notes: This species is nearest to E. peruana Jacz. fi'om which it is distinguished in the males by having a longer, more slender pala and a stridular area on the forefemur, and in the fe- males by the shape of the eighth abdominal segment, and the de- pressed face. Location of types: Holotype male, allotype female, and 32 male and 31 female paratypes in the Francis Huntington Snow Entomo- logical Collections. This series bears the following label: "Peru, S. A., Apr. 7-8, 1935, F. Woytkowski, near Concepcion, Andes, 3,260 m. above sea level, near or in Rio Mantaro." Data on distribution: (Plate XXXV.) Besides the types we have : 218 The University Science Bulletin- Peru, South America: "Dept. Ayacucho, Prov. La Mar, San Miguel, 2,400 m. above sea level, Jordan R., weak current, June 2-4, 1941, Felix Woytkowski, No. 4213," 23 males, 17 females. "Dept. Ayacucho, Prov. La Mar, San Miguel, 3,400 m. above sea level, mountain stream Torobamba, July 9-12, 1941, F. Woytkowski, No. 4213a," 30 males, 37 females. Dept. Arequipa, Spring Creek, Cailloma, Aug. 25,, 1939, F. M. Mag. Exp., K. P. Schmidt (Field Mus. Coll.), 8 males, 3 females. Ectemnostegella montana Lundblad (Plate XXXII, figs. 1, la-lc) 1928. Ectemnostegella montana Lundblad, O. Zool. Anzeiger LXXIX, Heft 5-6, pp. 149'- 153, figs. 1-5. (Desc. from Argentina.) 1933. Ectemnostegella mo^itana, Jaczewski, T. Ann. Mus. Zool. Polonici IX, Nr. 21, p. 329. (Records Peru. Santa Rosa de Ocopa, 3,270 m. a. sea level.) Size: Length 6.5 mm. to 7.7 mm. Width across eyes 2.1 mm. to 2.3 mm. Color: General facies medium brown. Pronotum in macrop- terous forms crossed by about 16 narrow, irregular brown lines, in brachypterous forms by about 12. Head, limbs and embolium pale; venter dark. Dark pattern etched away on base of clavus; else- where, dark pattern in short, wavy, vermiculate lines, arranged in somewhat transverse series. Pale color dominant over the dark. Structural characteristics: Interocular space only slightly ex- ceeding the width of an eye and its width less than the length of the claval pruinose area; postocular space relatively broad at inner angle of eyes; vertex produced in both sexes, male vertex rather rounded in lateral view; male fovea broad and deep; face of male sparsely haired, that of female considerably more hairy; antennal segmentation: 1 : 2 : 3 : 4 : : 20 : 15 : 38 : 18 ^J ; 1 : 2 : 3 : 4 : : 20 : 18 : 40 : 20 5 . Pronotum with median carina visible on an- terior portion; pronotum and hemelytra heavily rastrate, appearing pebbled. Pruinose area of the embolar groove posterior to the nodal furrow about equal in length to that of the claval suture. Lateral lobe of prothorax about as broad at base as long, sides tapering to blunt apex. Mesoepimeron narrow with osteole near the tip; meta- xyphus longer than broad, arrow-shaped. Foreleg of female normal. Foreleg of male: femur stout, inner base somewhat produced and bearing about 12 rows of stridulatory pegs, followed by several rows of long silky hairs; tibia slender without a pad or spines; pala long and slender, with 5 pegs in upper distal row, and 5 long and 11 short pegs in lower row; pala slightly carinate at base on posterior side. Western Hemisphere Corixidae 219 Middle leg relatively stout, hind leg slender. Comparative measure- ments as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 42.8 : 33.1 : 38.1; hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 86.7 : 113.8 : 33.1. Strigil minute, of 3 combs. For details of male structures see Plate XXXII, figs. 1, la, lb, and Ic. Comparative notes: The males of Lundblad's species may be dis- tinguished by having a pronouced stridular area on the forefemur. The hairy, undepressed face of the females will separate them from the females of E. stridulata n. sp. Location of types: Described by Lundblad from many specimens .in the Berlin Museum taken by J. Steinbach in Salta Province, Ar- gentina, at altitude of 2,500 m. above sea level. Data on distribution: (Plate XXXV.) Argentina: Salta Province. 2,500 m. above sea level. (Type series.) Peru: Santa Rosa de Ocopa, 3,270 m. above sea level. 1 male (brachypterous), 1 female (macropterous) (Jaczewski, 1933). Our collections contain the following specimens: Bolivia: Colomi, April, 1938, A. M. Olalla, 111 males, 133 fe- males; Dept. Cochambamba, Mte. Tunari, Liriuni, Jan. 1939, A. M. Olalla, 15 males, 13 females. 220 The University Science Bulletin PLATE XXXII Ectemnostegella Lundblad Fig. 1. Ectemnostegella montana Lundblad; front leja; of male. Fig. la. Genital cap.sule of male. Fig. lb. Head of male. Fig. Ic. Dorsal view of male abdomen. Fig. 2. Ectemnostegella peruana Jaczewski; front leg of male. Fig. 2a. Genital capsule of male. Fig. 2b. Head of male. Fig. 2c. Dorsal view of male abdomen. Fig. 3. Ectemnostegella woytkoniskii n. sp.; front leg of male. Fig. 3a. Genital capsule of male. Fig. 3b. Head of male. Fig. 3c. Dorsal view of male abdomen. Western Hemisphere Corixidae 221 PLATE XXXII 222 The University Science Bulletin PLATE XXXIII , Ectemnostegella Lundblad Fig. 1. Ectemnostegella stridulata n. sp.; front leg of male. Fig. la. Dorsal view of male abdomen. Fig. lb. Head of male. Fig. Ic. Genital capsule of male. Fig. 2. Ecteynnostegella jamesi n. sp.; front leg of male. Fig. 2a. Dorsal view of male abdomen. Fig. 2b. Head of male. Fig. 2c. Genital capsule. Fig. 3. Ectemnostegella stridulata n. sp.; dorsal view of female abdomen (cleared). Fig. 3a. Prothoracic lateral lobes of male and female. Fig. 4. Ectemnostegella peruana Jaczewski; dorsal view of female abdo- men (cleared). Fig. 4a. Prothoracic lateral lobes of male and female. Western Hemisphere Corixidae 223 PLATE XXXIII 4 peruana ECTEMNOSTEGELLA lUNDBL 224 The University Science Bulletin PLATE XXXIV Ectcmnostegella Lundblad Fig. 1. Ectcmnostegella lunclbladi n. sp.; front leg of male. Fig. la. Dorsal view of male abdomen. * Fig. lb. Enlargement of strigil. Fig. Ic. Head of male. Fig. Id. Genital capsule of male. Fig. 2. Ectcmnostegella tumidacephala n. sp.; front leg of male. Fig. 2a. Dorsal view of male abdomen. Fig. 2b. Enlargement of strigil. Fig. 2c. Head of male. Fig. 2d. Genital capsule of male. Fig. 3. Ectcmnostegella pilosa,'rons n. sp.; front leg of male. P^iG. 3a. Dorsal view of male abdomen. Fig. 3b. Lateral view of head of male. P^G. 3c. Head of male, dorsal view. t Fig. 3d. Genital capsule of male. Fig. 4. Ectcmnostegella peruana Jaczewski; lateral view of head of male. Westerx Hemisphere Corixidae 225 PLATE XXXIV ECTEMNOSTEGELLA LUNDBL. 15—822 226 The University Science Bulletin PLATE XXXV LUNDBLADh JAMES/ TUMIDACEPHALA PILOSAFRONS WOYTKOWSKII STRIDULATA ECTEUNOSTEGA ClUADRATA KARWINi ECTEMNOSTEGELLA VENTURII' & f^. <^ Western Hemisphere Corixidae 227 Krizousacorixa Himgcrford 1930. Hungerford, H. B. Pan-Pacific Entomologist, VII, No. 1, p. 22. (New genus for Corixa femorata Guerin wliich is the genotype.) 1931. Jaczewski, T. Annales Musei Zoologici Polonici IX, Nr. l.'i, p. 207. 1933. Ancona, H. L. Anales del In.stituto de Biologia, IV, No. 1. pp. 51 -C9. 1935. Poisson, R. Archives de Zool. E.xp. et Gen., LXXVII, p. 458, 470. 1943. Walton, G. A. Trans. Soc. for British Entomology VIII, p. 157 (as .^ubg. of Trichocorixa Kii-k.). Inner angle of eyes acutely produced in both sexes. Infraocular portion of genae very broad. Rostrum small, transversely wrinkled. Fourth segment of antenna less than half the length of the third. Surface of pronotum and hemelytra almost smooth, surface moder- ately hairy. Embolium shallow. Hind wings often brachypterous. Hi'emelytra with reticulate pattern, membranal suture marked by a more or less distinct pale line. The pruinose area of the embolar groove posterior to the nodal furrow long, nearly half the length of the cubital ridge and longer than the pruinose area along the claval fold. Pronotum of male inflated, without carina. The lateral lobe of the prothorax somewhat linguiform, broader at base than at tip, bulged on the anterior lower margin to accommodate the base of the front coxa, the superior margin partly ^lidden and depressed by the inflated mesoepimeron. Legs comparatively short. Anterior femur of male greatly inflated with pronounced stridular peg field on its expanded base. Tibia of normal length without a pad. Tlie basal half of the anterior margin of hind femur pubescent. Males with dextral asymmetry and strigil but cases of reversal common. Genotype: C. jemorata Guerin-Meneville. Comparative notes: The smooth surface is like that of Coriselhiy from which even the females are readily distinguished by the acutely-produced inner angle of the eyes. Distribution: This genus has been taken only in Mexico. Tlic two species. may be separated as follows: A. Pala of male as in figure 6 on Plate XXXVI. Hefid of male inflated. * Female vertex usually produced as in figure 4 K. femorata (Ciuerin)' (See p. 227) AA. Pala of male as in figure 5 on plate XXXVI. Head of male less inflated. Female vertex less produced as in figure 1 K. azteca .Jaczewski (See p. 231) Krizousacorixa femorata (Guerin) (Plate XXXVI, figs. 2, 4, 6, 8, 10, 11; wash drawings 29 and 3(1, PI. VI) 1S57. ,Corixa femorata Guerin-Meneville, F. E. Le Monite'ur l'ni\er.-cel — Jourual offir-el de I'Empire Francais, Numero 330, p. 1298, 26 Novembre 1857. 1857. Corixa femorata, Guerin-Meneville, F. E. Revue et Magasin de Zoologie, 2nd ser.,. Tome IX, pp. 522-527, 1857 Paris. * Jaczewski states that females are very difficult to separate and indeed we find no lixeil reliable character for their separation. 228 The University Science Bulletin 1857. Coriia femorata, Guerin-Meneville. F. E. Bulletin Soc. Zool. Accliin. I\'. ji. 581. 1858. Corixa femorata, Gueiin-Meneville, F. E. L'lllustration Tome XXXII, Jmllet 17, 1858. (Gives drawings of adult, front leg of male, and eggs.) 1858. Corixa femorata. Guerin-Meneville, F. E. Bulletin Sue. E:nt. Fr. (.3) \'. p. CXLVIII-CLI. 1901. Corixa femorata. Champion, G. C. Biologia Centrali-Americana Rhynchota II. p. 381. (Makes C. femorata Guer. a synonym of C. abdominalis Say in error.) 1925! Arctocorixa femorata (Guer.) Hungerford, H. B. Bull. Brooklyn Ento. Soc, XX, p. 21, pi. I. (A valid species not syn. of C. abdominalis Say.) 1929. Corixa femorata Guerin, Hungerford, H. B. Pan-Pacific Ento., VI, No. 2, pp. 73- 77. (Reports finding types in National Museum, Paris.) 1930. Krizousacorixa femorata, Hungerford, H. B. Pan-Pacific Ento., VII, No. 1, p. 22. (Figures male genital capsule and front leg.) 1931. Krizousacorixa femorata. Jaczewski, T. Annales Musei Zoologici Polonici, Tome IX, Nr. 15, p. 207, PI. XX\'II, figs. 32-39; PI. XXIX, fig. fi4. 1933. Krizousacorixa femorata, Ancona, H. L. Anales del Instituto de Biologia. T. IV, No. 1, pp. 65-68, figs. 9-11, 17c. (Drawings dorsal aspect, hemelytron, egg, nymph — com- mon in "El Ahuautle.") Size: Length from 5.15 mm. small males to 7.25 mm. large fe- males, and head width from 1.8 mm. to 2.27 mm. Colo?-: General facies usually light but may be dark. Head and legs pale yellow; the mescsternum and abdominal venter of males usually black. The pronotum crossed by a variable number of slender brown lines (8 to 17) which may be furcated or incomplete. Pattern of the hemelytra formed of numerous, much furcated, anastomosing and interrupted brown transverse lines which are usually narrower than the pale interspaces. Membranal suture marked by a pale oblique stripe. Membrane with' zigzag-like figures. The left membrane with the pattern interiorly effaced. Embolium may be nearly black, embrowned or pale. Structural characteristics. The male: Head of the male inflated, the vertex roundly produced, the lateral margins of the head, be- yond the caudolateral angle of the eyes, very broad and the sub- ocular space very wide ; interocular space broader than an eye. The space behind the eye broad, as broad as the length of tiie last antennal segment which is only 31.25 percent of the le-ngth of the third. Facial impression of the male large, not very deep and covered with fine appressed hairs. Pronotum inflated, moderately long even in brachypterous forms and transversely depressed be- hind the middle in brachypterous forms. The front legs as shown in Plate XXXVI, fig. 6. Femur very thick with a strong prominence at the inner side of its base. On the femur a large patch of densely inserted hairs and extending below it on to the basal prominence about 11 rows of strong stridular pegs, 3 to 6 in each row. Pala relatively narrow, broadest beyond the middle, the pegs forming a curiously-curved row, resembling the Greek letter omega on the ter- minal portion of the jiala. The nnml^er of these pegs and their ar- Western Hemisphere Corixidae 229 rangement somewhat variable. The fifth abdominal tergite with a prestrigilar tuft of stiff hairs. Strigil small, longer than wide, with 3 to 4 combs. The right paramere or clasper as shown on Plate XXXVI, figure 8. The Feniale: The vertex of head usually distinctly produced. (See Plate XXXVI, figure 4.) The pronotum very short in brachyp- terous forms but normal in macropterous forms. The metaxyphus short, blunt at the apex, with concave lateral margins, the legs showing no distinguishing features. Jaczewski gives the following measurements: Middle leg — femur : tibia : tarsus : claw :: 100 : 44.8 : 29.8 : 36.0. Hind leg— femur : tibia : tarsus 1 : tarsus 2 : : 100 : 96.1 : 107.9 : 51.3. Location of types: The types, which for many years were pre- sumed to be lost, were located in the Paris Museum in 1928 (see Hungerford, 1929). Here were found "six pinned specimens of Corixa jemorata Guerin (four males and two females) (two labeled types) and four or five more in a glass vial." They were part of a display of insects and their eggs used as food (Huatle) in Mexico. Data on distribution: (Plate XXXVII.) While described from "Mexico" in 1857, no precise distributional records were given until Jaczewski's paper of 1931. In this he gives the following: "Tizapan, Jal., 11 VIII 1929, 17 males brach., 1 male macr., 9 females brach.; Mexico, D. F., 8 VIII 1926, leg. S. Tenenbaum and Dr. T. Wolski, 2 males brach.; Mexico, D. F., Chapultepec, 2 VIII 1929, 4 males brach., 4 females brach.; Tlalpam, D. F., 25 VIII 1929, 1 male macr., 2 males brach.; 2 upgrown larvae; Patzcuaro, Mich., 28 VIII 1929, 2 males macr. sinistral, 1 male brach. normal (dextral), 1 female macr., 1 female brach.; Patzcuaro, Mich., 31 VIII 1929, 1 male macr.; Texcoco, Mex., 4 VIII 1929, in canal, 1 female brach.; Texcoco, Mex., 4 VIII 1929, the lake, 1 male macr. sinistral, 2 males brach. normal, 7 females brach." Ancona, in his "El Ahuautle de Texcoco," gives the biology, ecology and the part this species plays in this curious food product. We have before us insects with the following records: Mexico: Chiapas: San Vicente, Jan. 4, 1938, 540 m. Utrilla L. female (macr.). Michoacdn: Carapa, Sept. 2, 1938, H. D. Thomas, 13 males (3 sinistral) 24 females {all macr.); Carapa, Sept. 8, 1938, H. D. Thomas, 7 males (2 sinistral) 4 females (all macr.); Patzcuaro, Sept. 2, 1938, H. D. Thomas, 5 males, 13 females (all dextral, all 230 The University Science Bulletin macr. except 1 female brach.); Patzcuaro, Aug. 31, 1938, H. D. Thomas, 1 male (dextral, brach.) 5 females (macr.); Morelia, Sept. 4, 1938, H. D. Thomas, 8 males (3 sinistral) 37 females (all macr. except 1 female) ; Zamora, Sept. 8, 1938, H. D. Thomas, 5 females (4 brach.) ; 10 miles down Chinapa road, Sept. 5, 1938, H. D. Thomas, 2 females (macr.); Zacapu, Sept. 1, 1938, H. D. Thomas, 5 females (macr.), L. J. Lipovsky, 1 female (macr.). Jalisco: Tecolotlan, Sept. 15, 1938, H. D. Thomas, 1 male (sinis- tral) 3 females (macr.); Chapala, Sept. 11, 1938, H. D. Thomas, 2 males (dextral) 6 females (all macr.). Chihuahua: Chihuahua, July 15, 1938, H. D. Thomas, 1 female (macr.). Zacatecas: Los Potosi, Aug. 8. 1944, Henry Thomas, 5 males (2 sinistral) 11 females. i Aguascalientes: 5 miles S. E. Rincon, July 16, 1934, Smith and Dunklc, 16 males (5 sinistral) 25 females (all more or less brach.) ; Aug. 9, 1944, Henry Thomas, 3 males (1 sinistral) 4 females. 8an Luis Potosi: 20 miles west of San Luis Potosi, Aug. 8, 1944, Henry Thomas, 50 males (27 sinistral) 53 females; Aug. 4, 1944, dirty j^md, Henry Thomas, 1 male (dextral) 4 females; Aug. 5, 1944, Henry Thomas, 2 males (1 sinistral) 2 females; 10 miles east of San Luis Potosi, Aug. 7, 1944, Henry Thomas, 2 females. TamauUpas: San Jose, Ai)ril 1910, 1 female. Hidalgo: Real del INIonte, Sept. 23, 1938, No. 29, H. D. Thomas, 25 males (7 sinistral) 9 females (only 3 fully macr.); Real del ]\Ionte, Sept. 23, 1938, L. J. Lipovsky, 2 males (1 sinistral) 7 fe- males (all brach.); Agua Fria (near Jacala), July 28, 1937, H. D. Thomas, 13 males (5 sinistral) 117 females (79 brach.), 8 of males have wings two-thirds developed, other 5 macropterous ; Actopan, Sept. 23, 1938, No. 32, H. D. Tliomas, 34 males (11 sinistral, 14 macr.) 164 females (8'macr.). Puebla: Puebla, July 24, 1937, H. D. Thomas, 7 males (4 sinis- tral) 4 females; Puebla, July 25. 1937, H. 1). Thomas, 1 male (dex- tral) 2 females. Distrito Federal: 150 klm. n. Mex. City, July 27, 1937, H. D. Thomas, 1 male (sinistral) ; Tlalpam, Nov. 3, 1936, H. D. Thomas, 10 inalcs (2 sinistral) 7 females (all brach.); Lake Texcoco, July 26, 1937, H. D. Thomas, 38 males (1 sinistral, 20 brach.), 80 fe- males (70 brach.) ; Mexico, Apr. 22, 25, 1910, 11 males (1 sinistral) 15 females; Pefion, Oct. 27, 1898 (Ball Coll. in U. S. N. M.), 1 male Western Hemisphere Corixidae 231 (dextral) 7 females; Guadalupe, Aug. 31, 1903, W. L. Tower, 2 fe- males; Texcoco Sea, Jan. 31, 1926, A. Dampf, 1 male (dextral). Mexico: West of Jalapa 15 klm., July 18, 1937, H. D. Thomas, 3 males (2 sinistral) ; Lake Texcoco, Palmer, 3 males (dextral) 1 fe- male (Mus. Comp. Zool., Cambridge, j\Iass.). Krizousacorixa femorata (Guer.) occurs possibly in Chiapas and certainly in the states of Michoacan, Jalisco, Chihuahua, Aguas- cahentes, San Luis Potosi, Tamaulipas, Hidalgo, Puebla, Mexico, and Distrito Federal. Krizousacorixa azteca Jaczewski (Plate XXXVI, figs. 1, 3, 5, 7, and 9) 1931. Krizousacorixa azteca Jaczewski, T. Annales Musei Zoologici Polonici, Tom IX, Nr. 15, p. 211, Plate XXMII, Figs. 40-42; Plate XXIX, Fig. 6.5. 1933. Krizousacorixa azteca, Ancona, H. L. Anales del Institute de Biologia (Mexico), T. IV, N. 1, p. 64, figs. 9, 12, 13, 17A. (Drawings — dorsal aspect, hemelytra, egg, nymph— a common part of "El Aliuautle.") 1935. Krizousacorixa azteca, Poisson, R. Archives de Zool. Exp. et Gen., LXXVII, p. 471, fig. XV A. Size: Length from 5.67 mm. to 6.5 mm. Head width 1.89 mm. Color: General facies dark but pattern indistinguishable from dark specimens of K. jeinorata. Structural characteristics: Male: Head of male less inflated than in K. femorata and vertex less produced. (Compare figs. 2 and 3 on Plate XXXVL) The lateral margin of the head, beyond the cau- dolateral angle of the eyes, broad. The space behind the eyes not as broad as the length of the last antennal segment which is 39.1 percent of the length of the third. Literocular space broader than an eye. Facial impression large, usually shallow, and covered with fine, appressed hairs. The pronotum well developed. The front legs as shown in figure 5, Plate XXXVI. Two rows of palar pegs, the outer row of about 20 pegs, the inner row of from 6 to 9 pegs. The fifth abdominal tergite with a prestrigilar tuft. Strigil a little shorter than in K. femorata, with 4 combs. Right paramere or clasper more distinctly claw-like at apex. The female: Very difficult to distinguish from 7v. fem.orata. The vertex of head more broadly rounded (see figure 1, Plate XXXVI). Since the species is known only from macropterous forms, the pro- notum is well developed. The metaxyphus is like that of K. femo- rata. Jaczewski gives the following measurements for the legs — Middle leg— femur : tibia : tarsus : claw : : 100 : 44.9 : 32.2 : 36.2. Hind. leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 97.3 : 117.6 : 54.1. 232 The University Science Bulletin PLATE XXXVI Krizousacorixa Hungeiford Fig. 1. Krizousacorixa azteca Jaczewski; head and pronotal disk of female. Macropteroiis form with well developed pronotal disk. Fig. 2. Krizousacorixa femorata (Guerin) ; head of male. Note the acutely produced inner angle of the eye which is a generic character. Fig. 3. Krizousacorixa azteca Jaczewski; head of male. Vertex less pro- duced than in K. jemorata (Guerin). Fig. 4. Krizousacorixa jemorata (Guerin); head and pronotal disk of fe- male. Brachypterous form showing the reduced pronotal disk. Fig. 5. Krizousacorixa azteca Jaczewski; front leg of male. Fig. 6. Krizousacorixa jemorata (Guerin) ; front leg of male. Fig. 7. Krizousacorixa azteca Jaczewski; genital capsule of male. Pig. 8. Krizousacorixa jemorata (Guerin) ; genital capsule of male. Fig. 9. Krizousacorixa azteca Jaczewski; abdomen of male, dorsal view. Fig. 10. Krizousacorixa jemorata (Guerin); head and front legs of male showing the long hypo-ocular suture extending obliquelj' from the lower mar- gin of the eye and (a) the sclerotized margin of the head against which the peg field of the femur (c) rubs in stridulating; (d) the tibia; (e) the pala. Fig. 11. Krizousacorixa jemorata (Guerin); abdomen of the male, dorsal view. Western Hemisphere Corixidae 233 PLATE XXXVI 3. K. azteca S I. K. oztecoy 4. K femorato f 9 K aileca Jaci \N II K tetnorato (Guer) 234 The University Science Bulletin Comparative notes: Males easily distinguished from K. femorata (Guer.) by the pala. The females usually distinguishable by their less acute vertex but not always because the character is variable. According to Jaczewski's figures, the intermediate and hind tarsi are relatively longer than in K. femorata (Guer.) and the last an- tennal segment relatively longer, but we have not found these measurements absolutely dependable. Location of types: The types were all placed in the Polish Mu- seum at Warsaw. Data on distribution: (Plate XXXVII.) Jaczewski, who de- scribed this species, chose a male from Tizapan, Jalisco, as the holotype and reported it from the following places: Tizapan, Jal., 11 VIII 1929, 2 males, 12 females; Chapala, Jal, 16 VIII, 1929, 1 female; Mexico, D. F., Chapultepec, 2 VIII 1929, 2 females; Tlalpam, D. F., 25 VII 1929, 1 female; Texcoco, Mex., 4 VIII 1929, ,a pool, 5 females^ Texcoco, Mex., 4 VIII 1929, the lake, 2 females; Texcoco, Mex., 4 VIII 1929, in canals, 2 females; Patzcuaro, Mich., islet Janicho, 28 VIII 1929, 1 female; Patzcuaro, Mich., 28, VIII 1929, 3 females. From the above it is evident that he had but two males, both from Tizapan, and that the other records were based upon females which are difficult to place with certainty. Nevertheless, his de- terminations have been verified, for Ancona took males in Lake Texcoco and Thomas collected them from Morelia, Carapa, and Patzcuaro, Michoacan. We have before us the Thomas material, labeled as follows: Mexico: Michoacan: Morelia, Sept. 4, 1938, H. D. Thomas, 1 male, 3 females; Morelia, Sept. 3, 1938, H. D. Thomas, 1 male; Carapa, Sept. 8, 1938, H. D. Thomas, 1 male, 3 females; Patzcuaro, Aug. 31, 1938, H. D. Thomas, 2 males, 1 female. Zacatecas: Los Potosi, Aug. 8, 1944, H. D. Thomas, 3 females. District Federal: Lake Texcoco, July 26, 1937, H. D. Thomas, 1 female. The species therefore occurs in Michoacan, Jalisco, Zacatecas, Mexico, and the Federal District of Mexico. Western Hemisphere Corixidae 235 PLATE XXXVII zyo 31)0 236 The University Science Bulletin Trichocorixella Jaczewski 1931. Jaczewski, T. Annates Miisei Zoologici Polonici, Tom IX, Xo. 15, p. 217 (with 7'. wolskii Jaczewski as genotype). 1935. Poisson, R. Archives de Zool. Exp. et Gen. LXXMI, p. 458. 1942. Hungerford, H. B. Jl. Kansas Ent. Soc, XV, No. 2, p. 62 [reports T. wolskii Jaczewski as syn. of T. mexicana (Hungerford) 1. 1943. Walton, G. A. Trans. Soc. for British Entomology, VIII, p. 1.57, (as subgenus of Trichocorixa Kirk). Doctor Jaczewski gave the following description of his new genus: "Abdominal asymmetry in the males sinistral, genital armature directed leftwards. Strigil present. Front tibiae and palae of males as in Trichocorixa Kirk., but the palae with two rows of stridulatory pegs, one of these rows forming the central portion of a row of un- modified bristles. Pattern of the hemelytra of the Trichocorixa- type, membranal suture not marked by a pale obliciue stripe, pale markings of corium being continued over the membrane without any interruption. "Generic type: Trichocorixella wolskii n. sp. "'Trichocorixella gen. n. differs from Trichocorixa Kirk., with which it seems to be most closely related, in first line by the dis- position of the s.tridulatory pegs on the palae of the males." In 1942 it was discovered that Trichocorixella wolskii Jaczewski and Pabnacorixa mexicana Hungerford are one and the same thing. An examination of 60 males disclosed that 24 were sinistral and 36 dextral and that both right and left asymmetiy were represented in all six lots available for study. This makes necessary a redescrip- tion of the genus, for the genus is really unrelated to Trichocorixa as indicated by the normal position of the nodal furrow in the fe- males. General facies as in Palmacorixa. Elongate, slender species of small size. Vertex bluntly produced in both sexes. Synthlipsis broader than in Pabnacorixa (as wide as an eye), with the inner angle of the eye right to acutely angled instead of rounded as in Pabnacorixa. Antenna densely pilose and the fourth segment rela- tively longer than in Palmacorixa. Postocular space broad. Rear margin of the head strongly curved and embracing a very short i)ro- notum. Pronotal disk moderately angulate laterally. Lateral lobe of prothorax linguilate. Surface of pronotum and hemelytra lightly i-ugulose, the latter with rather numerous procumbent hairs. Hem- elytra narrow, elongate, with vermiculate markings; the membrane reduced, not distinctly defined from the corium; embolium broader than in Palmacorixa. Western Hemisphere Corixidae 237 Hind wings usually aborted and nonfunctional. Front femur of male with stridular area; tibia moderately long, distally produced above with a white pad below the production; pala short, with two rows of pegs. Under side of hind femur nearly half pilosely covered. Metaxyphus short, triangular. Male abdomen unstable, either sin- istral or'dextral, with a strigil. The fourth abdominal tergite with- out large hair-margined lobes; the seventh tergite without the hook characteristic of Palmaconxa. Last ventral abdominal segment of female plainly and broadly incised at its tip. This genus, which is closely related to Palmacorixa, shows by its inner angle of the eye a character that is possessed by Krizousn- corixa . Genotype: Trichocorixella wolskii Jaczewski =: T. mexicana (Hungerford). Trichocorixella mexicana (Hungerford) (Plate XXXVni; wash drawing No. 25, Plate V) 1927. Palmacorixa Jtiesicana Hungerford, H. B. Pan-Pacific Ent. IV, No. 2, p. 91. 1930. Palmacorixa mexicana. Walley, G. Stuart. Can. Ent. LXII, pp. 99, 101, 106. 1931. Trichocorixella ivolskii Jaczewski, T. Annales Musei Zoologici Polonici, IX, No. 15, p. 218, PI. XXVIII, figs. 47-51, PI. XXIX, fig. 66. 1942. Trichocorixella mexicana. Hungerford, H. B. Jl. Kans. Ent. Soc, XV, No. 2, p. 62. Size: Length 4.5 mm to 5.7 mm. Width of head across eyes 1.4 mm. to 1.6 mm. Color: General facies light to medium dark. Vertex may be en- tirely pale or may have both a median longitudinal stripe and a brown dot or spot on the interocular space near the base of each eye. These spots often remind one of ocelli. The caudal margin of the head may be brown. The pronotal disk margined with brown and crossed by five or six more or less broken or split brown lines ; clavus crossed by broken or furcate brown lines, the basal ones much narrower than the pale interspaces; the distal ones broken and anas- tomosing, as is true of the corium and membrane; embolium em- browned; face, limbs and venter pale but sometimes embrowned. Structural characteristics: Frontal depression of male large, at- taining the eyes laterally and surpassing them dorsally, front margin of vertex produced, faint median longitudinal carina ending in the caudally produced rear margin of the head. Postocular space rela- tively broad. The interocular space wider than an eye as seen in projection. The antennal segments: 1 : 2 : 3 : 4 : : 20 : 12 : 25 : 10 (J ; 1 : 2 : 3 : 4 : : 20 : 12 : 28 : 12 5 . Pronotal disk short, len- ticular, its length to width varying from 22 : 60 to 28 : 52 in the 238 The University Science Bulletin brachypterous forms; its surface rugulose to faintly rastrate. Lat- eral lobe of prothorax wide at base, narrowing gradually toward the rounded apex. Hemelytral surface nearly smooth with rather num- erous procumbent hairs. Mesoepimeron broader than the lateral lobe of the prothorax, the osteole of the scent gland laterad of its tip. Metaxyphus short, triangular. The front femur of the male somewhat inflated, basally produced, with a large area of eight or more rows of stridular pegs; the tibia and pala as shown on plate XXXVIII, the number of pegs in the upper, somewhat crescent- shaped row, from 8 to 10 and 3 or 4 pegs in the lower row. The palm a little broader in both sexes than in Palniacorixa. The middle leg: femur : tibia : tarsus : claws :: 100 : 49.4 : 30.9 : 43.6 (ave. of 3 males and 3 females). The middle fcnmr of the male with a fringe of long hair along the middle of its caudal margin. (See Plate XXXVIII, figure C.) The hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 88.2 : 113.3 : 45.4 (ave. 3 males and 3 females). The upper side of the hind femur with a row of from 7 to 12 pegs; the under side with most of the basal half pilose. The abdominal dorsum and genital capsule of the male, and the underside of the female abdomen as shown on Plate XXXVIII. Location of types: Palniacorixa mexicana Hungerford was de- scribed from a male and a female taken in the Xochimilco Sea, Mex- ico, D. F. Aug. 3, 1924, by Alf. Dampf and are in the Francis Huntington Snow Collections of the University of Kansas. Tricho- corixella ivolskii Jaczewski described from 3 males and 15 females from Mexico, D. F., Chapultepec, Aug. 2, 1929. These were in the Polish National Museum which was partially destroyed in World War II. ■ Doctor Jaczewski reports that all of his types were lost. Comparative notes: The general facies of this species simitar to species of Palniacorixa. from which it differs in having the inner angle of the eyes sharply angulate. The long anterior tibia and the short triangular pala with its peg arrangement in the males similar to Corisella species from which it is distinguished by the eyes as described above. The genus Krizousacorixa also has the inner angle of the eye even more acutely angulate, but the male pala is decidedly different in the Krizovsacorixa species and the females do not have the incised tip to the last ventral abdominal segment. Moreover, both Corisella and Krizousacorixa have a pruinose area on the cor- iupi ,4ilong the claval suture which is lacking or at least very slight, in both Palmacorixa and Trichocorixella. Western Hemisphere Corixidae 239 Data on distribution: (Plate XLII.) We have before us the fol- lowing : Mexico; Zacatccas: Los Potosi, July 9, 1944, H. D. Thomas, 1 female. Aguascalientes: July 9, 1944, H. D. Thomas, 2 males (both sinis- tral), 1 female. San Luis Potosi: 20 mi. w. of San Luis Potosi, July 8, 1944, H. D. Thomas, 6 females. Puebla: Puebla, July 24, 1937, H. D. Thomas, 3 males (1 sinis- tral, 2 dextral), 10 females; Tehuacan, July 18-25, 1937, H. D. Thomas, 16 male's (8 sinistral, 8 dextral), 18 females. Dist. Federal: Chapultepec, Aug. 10, 1937, H. D. Thomas, 21 males (7 sinistral, 14 dextral), 63 females; Xochimilco, June 21, 1934, H. Hinton, 11 males (4 sinistral, 7 dextral), 16 females; Mex- ico, April 22-25, 1910, 2 males (1 sinistral, 1 dextral), 1 female. 240 The University Science Bulletin PLATE XXXVIII Trichocorixella Jaczewski Fig. 1. Trichocorixella mexicana (Hiingerford) (^wolski Jaczewski); dorsal view of male abdomen, showing sinistral asymmetry. Fig. la. Head of male. Fig. lb. Front leg of male. Fig. Ic. Middle femur of male. Fig. Id. Genital capsule of male. Fig. le. Ventral view of female abdomen. Fig. If. Dorsal view of male abdomen, showing dextral asymmetry. Fig. Ig. Dorsal view of male abdomen, showing sinistral asymmetry. Western Hemisphere Corixidae 241 PLATE XXXVIII TRICHOCORIXELLA JACZ 16—822 242 The University Science Bulletin Pahnacorixa Abbott 1912. Abbott, James F. Ento. News, XXIII, pp. 337-339. 1913. Abbott, J. F. Can. Ent. XLV, p. 113. 1917. Van Duzee, E. P. Catalogue of the Hemipteia of America, p. 485. 1920. Hungerford, H. B. Univ. of Kansas Science Bull., XI, pp. 212-213. 1923. Abbott, James F., in Guide to the Insects of Connecticut, Pt. IV, p. 390. 1926. Blatchley, W. S. Heteroptera of Eastern North America, pp. 1082-1083, fig. 215, PI. XII, fig. 19. 1928. Jaczewski, T. Annales Musei Zoologici Polonici VII, pp. 55, 58. 1930. Walley, G. Stuart. Can. Ent., LXII, pp. 99-100, 2 plates, 11 figures. 1935. Poisson, R. Arch, de Zool. Exp. et Generale, LXXVII, p. 458. 1943. Walton, G. A. Trans. Soc. for British Entomology VIII, p. 157 (as subgenus of Trichocorixa Kirk.). Elongate, slender species of small size. Vertex bluntly produced in botii sexes. Synthlipsis narrow. Antennae densely pilose, third segment long and slightly curved, fourth very short, less than one- fourth the length of the third. Rear margin of the head strongly curved and embracing a very short pronotum. Pronotal disk sharply angulate laterally. Lateral lobe of prothorax ligulate, longer than broad, upper margin curved so that lobe becomes wider toward base, lower margin straight. Surface of pronotum and hem- elytra rugulose. Hemelytra narrow, elongate, with vermiculate markings, tapered posteriorly, only slightly overlapping at tips, the membrane area very small, narrow, and not distinctly defined from the corium ; embolium a deep, narrow trough, the pruinose area beyond the embolar suture (nodal furrow) very long. Hind wings usually aborted and nonfunctional but occasionally fully developed.* Front femur of male with stridular area; tibia short, globose, with- out a distal pad; pala thin, its palm narrow. Under side of hind femora nearly bare of pilosity. Metaxyphus short, subtriangular. Male abdomen dextral with a strigil; the fourth abdominal tergite with large hair-margined lobes; seventh tergite just to right of middle with a pencil of long hairs and a small, curved dextral sclerotized hook. Last ventral abdominal segment of female not plainly in- cised at its tip. Genotype: Pahnacorixa gillettei Abbott. This strikingly distinct little genus has but one close relative which is Trichocorixella Jaczewski. The general facies of the species of these two genera are so similar that the genotype of Trichocorixella was first described as a Palmacorixa. The data assembled at Ithaca, New York, by the senior author many years ago indicated that P. biienoi and P. nana wintered there in the fourth nymphal instar whereas most corixids winter as adults. * In fully winged foims, which are rare, the pronotum is better developed but still rela- tively short. Western Hemisphere Corixidae 243 However, we have in our collections adults of P. buenoi Abbt. taken in South Carolina in January; in Texas, February 26; in Kansas, March 2; and in Alabama, March 13, indicating that in the southern range at least the winter can be passed as adults. Moreover, the species of this genus seem to be associated with streams or more or less permanent waters. Key to Palmacorixa Abbott 1. Male pala a very broad, flattened plate with a cluster of poorly defined peRS near its base as shown on Plate XXXIX, figure la ; the pronotal disk with well marked anterolateral depressions in both sexes 2 Male pala not a broad, flattened plate; palar pegs in an arching row, often crowded into a double row of longer pegs distally 3 2. (1) Black lineations of tegmina dispersed, not massed to form heavy longitudinal blotches or stripes .' P- yillettei Abbott (p. 243) Black lineations of tegmina massed to form an irregular black stripe on clavus parallel to claval suture, another at base of corium extending posteriorly on corium along claval suture and dividing near apex of clavus to invade disk of corium P. giUettei confiuens Walley (p. 245) 3. (1) Middle femur of male without a longitudinal row of pegs on its ventral surface. P. buenoi Abbott (p. 24(i) Middle femur of male with a longitudinal row of pegs on its vential surface. ... 4 ■I. (3) Small, usually under 5 mm. long. Less than 40 pegs in femoral peg row. P. iin'ia Walley (p. 24!)) Larger, usually more than 5 mm. long. More than 40 pegs in femoral peg row. P. nana walleyi n. subsp. (p. 251) Palmacorixa gillettei^' Abbott (Plate XXXIX, figs. 1, la, lb, Ic, Id, and le; wash drawing No. 24, Plate V) 1912. Palmacorixa gillettii Abbott, J. F. Ent. News XXIII, pp. 337-339, PI. 18. 1913. Palmacorixa giUettei, Abbott, .J. F. Can. Ent. XLV, p. 113. 1913. Palmacorixa giUettei, Abbott, J. F. Bull. Brooklyn Ent. Soc. VIII, p. 81, fig. Ic. 1917. Palmacorixa gillettii. Van Duzee, E. P. Catalogue of the Hemiptera of America . . . , p. 485. 1920. Palmacorixa gillettii, Hungerford, H. B. Univ. of Kansas Sci. Bull., XI, pp. 214- 215. 1921. Palmacorixa giUettei, Hussey, R. F. Psyche, XXVIII, p. 14. (From Galien River near Three Oaks, Mich.) 1920. Palmacorixa gillettii, Blatchley, W. S. Heteroptera of Eastern North America, p. 1082, fig. 215j. 1930. Palmacorixa gillettii, Walley. G. Stuart. Can. Ent. LXII, p. 101, PI. XI, figs. 1, 2. 4. Size: Length 4.6 mm. to 6 mm. ; width of head 1.3 mm. to 1.5 mm. Color: General facies light to medium. The vertex and face yellow to dark brown. The pronotum crossed by six or more, more or less broken or split brown bands. The hemelytral pattern re- * This species was named in honor of Professor Gillette and, while spelled P. gillettii in the original description, it is assumed that Abbott considered this a typographical error, for in the following papers he used P. giUettei. 244 The University Science Bulletin ticulate, the brown lines narrower than the pale interspaces, some- times partly effaced on the inner basal area of the claviis and fused into a ragged longitudinal lateral submarginal band on clavus, also often fused into a zigzag, sometimes broken, submarginal line on the corium; the pattern of membrane continuous with that of corium; embolium pale. Venter and legs pale. Structural characteristics: Frontal depression of the male not very deep but margined laterally by a ridge between it and a de- pression beneath the inner angle of the eye and dorsally is continued as two slightly diverging fossa extending nearly to the anterior margin of the vertex. Antennal segments 1 : 2 : 3 : 4: : 15 : 15 : 43 : 10 J ; 1 : 2 : 3 : 4 : : 15 : 15 : 45 : 10 5 . Pronotal disk len- ticular, its length : its width :: 28 : 53; anterior portion depressed on either side of the median line which appears as a faint carina; its surface sometimes faintly rastrate. Hemelytral surface rugulose with gparce hairs. Mesoepimeron a little broader than the lateral lobe of the prothorax, the osteole of the scent gland laterad of its tip. Metaxyphus short, triangular, pointed. The front femur of the male with a large stridular field of pegs; the tibia nearly globose, the pala a large, thin plate covered with appressed, white, spinelike hairs and some stouter ones as shown on Plate XXXIX, figure la ; the palm very narrow. The middle leg: femur : tibia : tarsus : claw :: 100 : 41.1 : 24.1 : 40.3. The male middle femur does not have a row of pegs on the ventral side. The hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 78.2 : 105.1 : : 38.6. The upper side of the hind femur with a long row of a dozen sharp-pointed pegs; the underside bare and shining, rarely showing any pegs but occa- sionally up to a dozen irregularly spaced spines. The abdominal dorsum of male as shown on Plate XXXIX, figure Id. The male clasper as shown on Plate XXXIX, figures lb, Ic, and le. Comparative notes: Doctor Walley writes, "The males of gll- lettei arc at once distinguished from all other species by the much dilated and flattened pala shown in figure 1. The lobes of the fourth abdominal tergite are a little shorter in gillettei than in buenoi and the strigil is noticeably larger in the former species. The male right clasper, while slightly variable, has a more conspicuous lobe on its inner margin just beyond the middle than in buenoi and nana. Further, the section beyond the middle is broader and less necklike than in buenoi. The pronotum is usually distinctly longer in pro- portion to its width in buenoi. The color pattern of gillettei varies somewhat as noted above, but the black reticulations of the tegmina Western Hemisphere Corixidae 245 are always more dispersed, not tending to form -a close network as in buenoi, and they are frequently entirely absent on the inner basal angle of the clavus. This gives the whole insect a distinctly paler aspect than either buenoi or nana. The vertex is paler with the longitudinal brownish streak distinct in gillettei." Unfortunately, the color pattern is so variable that the species are not distinguish- able by it. P. buenoi often has a brown streak on head and some- times the pattern on the base of the clavus is effaced. Location of types: According to Abbott's paper, he described this species from three males and three females, collected in May and June by Professor C. P. Gillette and given to him. Walley, in 1930, studied a male in the Bueno collection that bears the label "Ft. Collins, Col, 5, 22, '00," a red label bearing the single word "type," and a pale blue label in Abbott's handwriting, ''Palmacorixa gillettei Abb. co-type." This specimen Walley designated the lecto- holotype. We have before us from the Abbott collection five speci- mens with red labels, each bearing the single word "type." They are all females! Three of them are labeled "Ft. Collins, Col. 5-22-00" and two, "Ft. Collins, Col. 6-7-00." Data on distribution: (Plate XLII.) Described from Fort Col- lins, Colorado, and reported from Michigan by Hussey and from Quebec province, Canada, by Walley. Besides the types we have seen the following: Minnesota: Rochester, July 16, 1921, H. B. Hungerford, 3 males, 3 females; Bengal, Aug. 10, 1922, H. B. Hungerford, 1 male, 1 female; Pelican Rapids, Aug. 22, 1922, H. B. Hungerford, 13 males, 10 females; Carlson, Aug. 8, 1922, H. B. Hungerford, 1 male, 1 female. Michigan: Cheboygan Co., Aug. 18, 1931, H. B. Hungerford, 1 male; Pidgeon River, 'July, 1938, H. B. Hungerford, 2 females; Bei^ rien Co., Sept. 1, 1919, R. F. Hussey (Hussey) ; Ann Arbor, July 30, 1921, R. F. Hussey (Hussey). Iowa: Butler Co., July 6, 1940, J. W., 1 male, 1 female. Palmacorixa gillettei confluens Walley (Plato XXXIX, fig. 2, after Walley) 1930. Palmacorixa gillettii confluens Walley, G. Stuart. Can. Ent. LXII, p. 103, PI. XI, figs. 3, 5. The following is taken from the original descriptive notes: Size: Average about 1 mm. longer than typical gillettei and are slightly more robust. 246 The University Science Bulletin Color: The ground color of the vertex, pronotum and tegmina is a rich, yellowish brown (the vertex is sometimes purplish tinged) with the black pronotal bars and tegminal blotches sharply contrasting. (See reproduction of Walley's figure on Plate XXXIX.) The front legs, face and venter are paler yellowish. Structural characteristics: "Structurally identical with gillettii." The variation shown in the right male clasper grades into that of typical P. gillettei. Location of types: Holotype: male, Minaki, Ont., July 4, 1928 (J. McDunnough) : No. 3125 in the Canadian National Collection, Ottawa. Allotype: female, same data as holotype. Paratypes, 9 males, 4 females, Minaki, Ont., June 30-July4, 1928 (J. Mc- Dunnough). Paratypes in the Canadian National Collection and in tlie collection of Mr. J. R. de la Torre-Bueno. . . . One male in the Francis Huntington Snow Collections, University of Kansas. (Pee Plate XLID. Palmacorixa buenoi Abbott (Plate XXXIX, figs. 3 to 3d ; Plate XL, fig. 3; Plate XLI, figs. 1 to 14) I'M 3. Palmacorixa buenoi Abbott, J. F. Can. Ent. XLV, pp. 113-116. 1(11,^. Palmacorixa buenoi, Abbott, J. F. Bull. Brookh-n Ent. Soc, VIH, p. 87 (figs. pala of $ and § ). 1917. Palmacorixa buenoi. Van Duzee, E. P. Catalogue of Hemipteia of America . . . , p. 485. li/17. Palmacorixa buenoi, Parishley, H. M. Dec. Papers of Boston Soc. Nat. Hist., VII, p. no. 102(1. Palmacorixa buenoi, Hungerford, H. B. Univ. of Kansas Sci. Bull.. XL PP. 213- 214, 221-228, PI. XXVIII (life history). 1021. Palmacorixa buenoi, Hussey, R. F. Psyche, XXVIII. p. 14. 1023. Palmacorixa buenoi, Abbott, J. F., in Guide to the Insects of Connecticut, Pt. IV, p. 390, fig. 3fi. 102fi. Palmacorixa buenoi, Blatchley, W. S. Heteroptera of Eastern North America. y>p. 1082-1083, PI. XII, fig. 19, fig. 215i. 102S. Palmacorixa buenoi, Torre-Bueno, J. R. de la, in A List of the Insects of New- York, |i. 142 (Cornell Univ. Agri. Exp. Sta. Memoir 101). 1030. Palmacfyrixa buenoi, Walley, G. Stuart. C'an. Ent. LXII, pp. 103-10(i, PI. XII. fig.s. 6, 9, 11. 1038. Palma,coriia buenoi, Brimley, C. S. Insects of North Carolina, p. 85. lU'.VJ. Palmacorixa bueoni, Millspaugh, Dick D. Field and Lab., VII, No. 2, p. 85. Size: Length 4.3 mm. to 6 mm.; width of head 1.2 mm. to 1.6 mm. Color: General facies light to medium dark. The vertex and face usually yellow; sometimes there is a median brown line and in others, both vertex and face are dark brown. The pronotum crossed by four to nine brown lines that vary in width and may be entire, often broken or furcate. The hemelytral pattern reticulate; usually these reticulations are more numerous than in P. gillettei; the pat- tern of membrane continuous with that of corium; embolium pale. Venter and legs pale. Western Hemisphere Corixidae 247 Structural characteristics: Frontal depression of the male shal- low, elongate, obovate. A depression beneath the inner angle of the eye. Antennal segments 1 : 2 : 3 : 4 : : 18 : 12 : 42 : 8 ^^ ; 1 : 2 : 3 : 4 : : 18 : 12 : 40 : 10 5 . Pronotal disk flattened, margined, lenticular in outline, evenly rounded posteriorly, dull, minutely ras- trate and usually distinctly shorter in proportion to its width than in P. gillettei. Hemelytral surface rugulose with sparse hairs. Meso- epimeron a little broader than the lateral lobe of the pronotum, the osteole of the scent gland just laterad of its tip. Metaxyphus short, triangular, pointed. The front femur of the male with a stridular field of pegs; the tibia short but less globular than in P. gillettei; the pala thin, rather elongate, the pegs usually in a single row as shown on Plate XXXIX, figure 3a. The middle leg: femur : tibia : tarsus : claws : : 100 : 42.2 : 27.7 : 44.5. The middle femur of the male does not have a row of pegs. The hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 80.7 : 107.7 : 36.3. The upper side of hind femur with a long row of about a dozen sharp pointed pegs; the underside bare and shining, rarely showing any pegs. The abdominal dorsum of the male as shown on Plate XXXIX, figure 3d. The male claspers as shown on Plate XXXIX, figures 3b and 3c. Comparative notes: The males do not have a row of pegs on the middle femur, which separates them from P. nana and P. nana ival- leyi, and the elongate pala readily separates them from P. gillettei. Usually the females may be separated from P. gillettei by the more numerous reticulations on the clavus, and by the pronotum which has only faint anterior depressions. Location of types: Described from two males and two females from White Plains, N. Y., taken in August and September by J. R. de la Torre-Bueno. These four specimens, each bearing a red label with the word "type," are before us. We are designating a male labeled "White Piains, N. Y., 21, IX, '07" as the lectoholotype and a female, taken with it, as the lectoallotype. The other two speci- mens are then paratypes, one taken Aug. 3, '08, and the other Aug. 31, '09. Doctor Abbott also reported specimens from Washington, D. C. (coll. W. L. McAtee) ; Oglethorpe, Georgia (coll. T. C. Brad- ley) ; Hadley, Mass. (coll. C. A. Frost), and Valhalla, N. Y., (coll. Bucno). We have before us the following: Valhalla, N. Y., 27-V- 08, 3 females; Hadley, Mass., 14-V-lO, 1 male, 2 females. We also have other specimens labeled White Plains, N. Y., that were studied bv Abbott and, while most of them are P. buenoi, there is one male 248 The University Science Bulletin that is Palmacorixa nana Walley, indicating that he included it within the range of variation of his P. buenoi. Data on distribution: (Plate XLII.) Described from White Plains, New York, and reported from Valhalla, N. Y., "Washington, D. C, Oglethorpe, Ga., and Hadley, Mass., by Abbott; from Ithaca, N. Y., by Hungerford; from Michigan by Hussey; from the Prov- inces of Quebec and Ontario, Canada, and from Iowa by Walley; from Texas by Millspaugh. Besides those of the type series, we have seen the following: U. S. A.: Neio York: White Plains, Aug. 3, 1908, 4 male.*, 4 females (Kirk. Coll.) ; Cold Springs Harbor, L. I., N. Y., Aug. 1902. 1 female (Barber Coll.) ; Cranberry Lake, L. I., July 29, 1919, C. H. Foster, 2 females (Drake Coll.) ; White Plains, June 28, 1919, Torre-Bueno (Bueno Coll.) 1 male; Long Island, Queen's Village, Sept. 25, 1927, J. C. Lutz (Lutz) ; Staten Island. Aug. 16, 1903, 1 male, 1 female; Ithaca, Beebe L., June 19, 1917, H. B. Hungerford, 1 male, 3 females; Ithaca, July 12, 1920, 1 male, 2 females (Cornell) ; Alleghany St. Park, 1 female (U.S.N.M.). Neiv Jersey: Lakehurst, May 23, 1903. 1 male; New Jersey, 1 male, 1 fe- male (Uhler Coll.) ; Rancoca, Aug. 30, 1927, E. M. Becton, 4 males. 3 females; Westville, June 5, 1898, 1 female (Parshley). Massachusetts: Northampton, Oct. 14, 1918, H. M. Parshley, 2 males, 5 females; Hadley, May 14, 1910. 1 male, 2 females. Pennsylvania: Philadelphia, July 1914, Carl Ilg, 1 male, 1 female; Bri.^tol, Sept. 4, 1937, J. C. Lutz, 2 males; Erie, Presque Isle, Horseshoe Pond, Jidy 1940, Mrs. T. Lewis (Carnegie) 3 males, 2 females. Virginia: Vienna, Sept. 19, 1931, P. W\ Oman, 2 males; Vienna, April 30, 1932, P. W. Oman, 6 males, 4 females (U.S. N. M.); Norfolk, April 9, 1932, L. D. Anderson, 3 males, 3 females; Norfolk, May 11. 1938. G. E. Gould, 3 males, 3 females. West Virginia: W. Hartford, Dec. 24, 1931, J. K. Moore (U.S.N.M.) 1 male. South Carolina: Clemson College, Jan. 24, 1930, D. Dunavan, 1 male, 1 fe- male (S. C. Exp. Sta.); Grantsville, Oct. 25, 1930, D. Dunavan (S. C. Exp. Sta.) 1 male, 1 female. Georgia: Tipton, July 28, 1930, R. H. Beamer, 9 males, 5 females. Florida: St. Petersburg. Sept. 13, 1937, E. M. Becton. 1 male; La Belle. July 16, 1939, J. D. Beamer, 1 female. Alabama: Marvin Lake, Mai-. 13, 1939, R. J. Christenson, 3 males, 5 fe- males; Coatopa, July 18, 1930, P. W. Oman, 2 males, 1 female; Tuskegee, July 22, 1930, P. W. Oman. 1 male; Montgomery, July 7, 1939, J. D. Beamer, 1 female. Louisiana: Madi.son Pari.sh, July 7, 1930, R. W. Bunn, 1 male. Texas: Colorado Co., May 11, 1922, G. O. Wiley, 9 males, 7 females; Men- ard Co.. July 19, 1938, R. H. Beamer, 1 male; Beasley, Nov. 7, 1932, L. D. Tuthill, 1 male; Wood Co., Feb. 26, 1939, D. C. Millspaugh, 1 male. Western Hemisphere Corixidae 249 Kansas: Decatur Co., July 6, 1926, R. H. Beamer, 8 males, 18 females; Douglas Co., July 9. 1920, W. E. Hoffmann, 1 male; Douglas Co., Oct. 8, 1923, H. B. Hungerford, 3 males, 1 female ; Doniphan Co., March 2, 1924, Jean Lins- dale, 1 male, 4 females. Iowa: Washington Co., June 11, 1940, 2 males. South Dakota: Volga. June 19, 1921, 1 female; Dixon, 1 mi. N. W., May 26, 1940, G. B. Spawn (Severin Coll.) Minnesota: Big Stone Co., July 19, 1910. 1 female; St. Paul, Phalcn Lake, June 19, 1921, H. B. Hungerford, 7 males, 13 females; Carlson. Aug. 8, 1922, H. B. Hungerford, 3 males, 1 female. Indiana: Mineral Springs. July 4, 1913, A. B. Wolcott, 1 male (Field Mus. Coll.). Michigan: Cheboygan Co., July 27, 1933, H. B. Hungerford, 1 male, 2 fe- males; Cheboygan Co., 1935, M. W. Sanderson, 2 males; Burt Lake, June 23, 1929. H. B. Hungerfoid, 1 male, 1 female; Huron Co.. Pigeon Lake. June 29, 1922, R. F. Hussey, 2 male.s, 2 females (Mich. Coll.). Palmacorixa nana Walley (Plate XL, figs. 1 to Id; Plate XLI, figs. 17, 18, 21-.31) 1930. Palmacorixa nana Walley, G. Stuait. Can. Ent. LXII, p. 106, PI. XII, figs. 7, 8 and 10. 1032. Palmacorixa nana, Ricker, Wm. E. Pul). of Ontario Fisheries Research Lab. No. 44 in Univ. Toronto Press Biol. Ser. No. 36, p. 88. (In stomach of speckled trout.) Size: Length 4 mm. to 5 mm.; width across head 1.27 mm. to 1.3 mm. Color: "Ground color yellowish brown, head suffused with brownish, the median brown line on vertex only faintly visible. Venter of thorax and front legs paler yellowish; mid and hind legs and abdominal venter yellowish brown. Pronotum with about seven slightly interrupted transverse black bars which are slightly nar- rower than the paler interspaces. Tegmina with an interlocking pattern of blackish flecks somewhat similar to gillettii but the flecks larger and coarser, giving a darker aspect to tegmina. Embolium dirty yellowish with extreme margin brownish. Apex of tegmina brownish tinged." (From Walley, 1930.) Structural characteristics: "Vertex from above produced as in buenoi. Front with median oval depression small, slightly exceed- ing lower margin of eyes but distinctly narrower than greatest inter- ocular width. Carina of vertex weak, obsolete anteriorly. Disk of pronotum twice as broad as median length, without median carina, surface finely roughened but not rastrate and without impressed lines, posterior margin bluntly angulate at middle. Lateral lobe of prothorax and metaxyphus as described for the genus. Front femora twice as long as broad, quadrangular with the rastrate area smaller 250 The University Science Bulletin than in buenoi. Front tibia with a row of four minute pegs near inner margin.* Pala shorter and stouter than in buenoi with more slender pegs in a single irregular row. Metathoracic wings vestigial. Tegmina dullish, finely roughened but not rastrate. Strigil formed as in gillettii, larger than in buenoi, 4-5 striae." Right clasper of male shown on Plate XL, figure lb. In addition to the above we give the following: Antennal segments 1 : 2 : 3 : 4 : : 12 : 12 : 35 : 8 (J ; 1 : 2 : 3 : 4 : : 15 : 15 : 38 : 5 ? . Middle leg: femur : tibia : tarsus : claws : : 100 : 42 : 27.1 : 43.8. The middle femur of the male with a longitudinal row of from 20 to 35 pegs on its lower surface. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 77.8 : 104.6 : 36.7. The- upper side of hind femur with an inconspicuous row of eiglit or more pegs; the underside bare and shining, rarely showing any pegs. The abdominal dorsum of the male as shown on Plate XL, figure Id. The male claspers as shown on Plate XL, figures lb and Ic. Additional drawings showing variations on Plate XLL Comparative notes: This species is smaller than P. buenoi Abbott and the row of pegs on the middle femur distinguishes it from that species. Hungerford's notes, 1920, on P. buenoi from Bool's Back- water, Ithaca, N. Y., apply to this species. Location of types: Holotype male, Kazubazua, Que., July 21, 1927, G. S. Walley ; No. 3126 in the Canadian National Collections, Ottawa. Male right front leg and genitalia on slide. Allotype female, same data as holotype. Paratypes 1 male, 2 females, Kazubazua, Que., July 22, 1927, G. S. Walley. The male paratype was kindly loaned to us for study. Data on distribution: (Plate XLII.) We have before us the following: Canada: Quebec: Wakefield, May, 1930, G. S. Walley, 1 male, 1 female. U. S. A.: New York: White Plains, Aug. 25, 1907, 1 male; Ithaca, Bool's Backwater, June 8, 1917, H. B. Hungerford, 2 males, 4 females; Ithaca, N. Y., July 9, 1920, 1 male (Cornell Coll.). North Carolina: Boardman, Sept. 21, 1915, R. W. Leiby, 2 males, 3 females. Michigan: Pigeon River, July, 1938, H. B. Hungerford, 4 males, 4 females; Ann Arbor, July 5, 1921, R. F. Hussey, 2 males, 1 female (Mich. Coll.). * These are shown in Walley 's diawins I'ut we have not been able to find them on a para- type loaned for study nor upon any specimens we have examined. Western Hemisphere Corixidae 251 Minnesota: Rochester, July 16, 1921, H. B. Hungerford, 19 males, 24 females; Hennepin Co., Minnehaha Creek, July 9, 1921, H. B. Hungerford, 1 male. Palmacorixa nana ivalleyi n. subsp. (Plate XL, figs. 2 to -Id; Plate XLI, figs. 15, 10, 19, and 20) A series of specimens that are considerably larger, lighter in color and with a longer row of pegs on the middle femur of the male are here designated as a subspecies of Pahyiacorixa nana Walley. Size: Length 4.8 mm. to 5.5 mm.; width of head 1.4 mm. to 1.5 mm. Color: General facies light to medium. The vertex and face usually yellow with a median brown line on vertex. Pronotal disk and hemelytral pattern as in P. buenoi. The brown markings on the base of the clavus sometimes partially effaced. Structural characteristics: Frontal depression of the male shal- low, obovate. A depression beneath the inner angle of the eye as in all the species of the genus. Antennal segments: 1 : 2 : 3 : 4 : : 15 : 15 : 40 : 5 (J ; 1 : 2 : 3 : 4 : : 15 : 15 : 42 : 5 $ . Pronotal disk minutely rastrate. Hemelytra surface rugulose with sparse hairs. Mesoepimeron no broader than the lateral lobe of the pronotum; the osteole of the scent gland just laterad of its tip. Metaxyphus short, the lateral margins concavely curved. The front leg of the male as shown on Plate XL, figure 2a. The middle leg: femur : tibia : tarsus : claws : : 100 : 40.7 : 25.5 : 39.2; the femur of the male with a row of 40 or more pegs. The hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 73 : 104.3 : 39.4. The upper side of the hind femur with a long row of about a dozen sharp pointed pegs ; th^ underside bare and shining, rarely showing any pegs. The ab- dominal dorsum of the male as shown on Plate XL, figure 2d. The male claspers as shown on Plate XL, figures 2b and 2c. Additional drawings on Plate XLL Location of types: Holotype, allotype and 22 paratypes (11 males, 11 females) from Douglas Co., Kansas, Oct. 24, 1921, Robert Guntert. In the Francis Huntington Snow Collections, University of Kansas. Comparative notes: This differs from the typical P. nana Walley in its larger size and in having a longer row of pegs on the middle femur of the male (see drawings on Plate XL). The left clasper of the male is narrower at its tip. 252 The University Science Bulletin Data on distribution: (Plate XLII. ) Douglas Co., Oct. 24, 1921, Robert Gimtert, 12 males, 10 females; Dykeman's Crossing, Waka- rusa R., nr. Lawrence, April 30, 1938, E. Humphrey, 70 males, 110 females. Texas: Sequin, June 26, 1938, R. I. Sailer, 21 males, 20 females. New Mexico: Eddy Co., July 9, 1927, P. A. Readio, 2 males, 3 females. PLATE XXXIX Palmacorixa Abbott Fig. 1. Palmacorixa gillettci Abbott; dorsal view of male (after WallejO.* Fig. la. Pala of male. Fig. lb. Right clasper of male genital capsule. Fig. Ic. Left clasper. Fig. Id. Dorsal view of male abdomen. Fig. le. Right clasper, enlarged (after Walley).* Fig. 2. Palmacorixa gillettci confluens Walley; dorsal view of male (after Walley).* •Fig. 3. Palmacorixa buenoi Abbott; dorsal view of male (after Wallov).* Fig. 3a. Front leg of male. Fig. 3b. Right clasper of male from Colorado Co., Texas. Fig. 3c. Left clasper, Colorado Co., Texas. Fig. 3d. Dor.sal view of male abdomen. * Doctor Walley kindly sent me his original drawings for use in this paper. Western Hemisphere Corixidae 253 PLATE XXXIX P&LMACORiya ABBT 254 The University Science Bulletin PLATE XL Palmacorixa Abbott Fig. 1. Palmacorixa nana Walley; middle femur of male. Fig. la. Front leg of male. Fig. lb. Right clasper of male (Quebec). Fig. Ic. Left clasper (Quebec). Fig. Id. Dorsal view of male abdomen. Fig. 2. Palmacorixa nana walleyi n. subsp.; middle femur of male. Fig. 2a. Front leg of male. Fig. 2b. Right clasper (Douglas Co., Kansas). Fig. 2c. Left cla.sper (Douglas Co., Kansas). Fig. 2d. Dorsal view of male abdomen. Fig. 3. Palmacorixa buenoi Abbott; middle femur of male. Western Hemisphere Corixidae 255 PLATE XL 9 oqoooooooooopooooooDnooOQOO" I P. nana WoIIpy /TT 3 P. buenoi Abbt. PALMACORIXA ABBT. 256 The University Science Bulletin PLATE XLI Palmacorixa Abbott Fig. 1. Palmacorixa buenoi Abbott; right clasper, Red Deer River, Mani- toba. Fig. 2. P. hucnoi Abbott; right chi.sper, Cheboygan Co., Mich. Fig. 3. P. buenoi Abbott; right clasper, Philadelphia, Pa. Fig. 4. P. buenoi Abbott; right clasper, Decatur Co., Kan. Fig. 5. P. buenoi Abbott ; right clasper, Colorado Co., Tex. Fig. 6. P. buenoi Abbott; right clasper. Marvin Lake. Ala. Fig. 7. P. buenoi Abbott ; right clasper, Douglas Co., Kan. Fig. 8. P. buenoi Abbott; right clasper, Norfolk, Va. Fig. 9. P. buenoi Abbott; left clasper. Norfolk, Va. Fig. 10. P. buenoi Abbott; right clasper, Norfolk, Va. Fig. 11. P. buenoi Abbott; left cla.sper, Tipton, Ga. Fig. 12. P. buenoi Abbott; right clasper, Tipton, Ga. Fig. 13. P. buenoi Abbott; left clasper, Rancoca, N. J. Fig. 14. P. buenoi Abbott; right clasper, Rancoca, N. J. Fig. 15. Palmacorixa nana walleyi n. subsp.; left clasper, Scott Co., Kan. Fig. 16. Pahnacurixa nana rcalleyi n. subsp.; right clasper, Scott Co., Kan, Fig. 17. Palmacorixa nana Walley; left clasper. Sequin, Tex. Fig. 18. Palmacorixa nana Walley; right clasper, Serjuin, Tex. Fig. 19. Palmacorixa nana walleyi n. subsp.; left clasper, N. C. Fig. 20. Palmacorixa nana ivalleyi n. subsp.; right clasper, N. C. Fig. 21. Palmacorixa nana Walley; left clasper. Pigeon River, Mich. Fig. 22. Palmacorixa nana Walley; right clasper, Pigeon River, Mich. Fig. 23. Palmacorixa nana Walley; left clasper, Ithaca, N. Y. Fig. 24. Palmacorixa nana Walley; right clasper. Ithaca, N. Y. Fig. 25. Palmacorixa nana Walley; male pala, Ithaca, N. Y. Fig. 26. Palmacorixa nana Walley; pala of male, Ithaca, N. Y. Fig. 27. Palmacorixa nana Walley; left cla.sper, Rochester, Minn. Fig. 28. Palmacorixa nana Walley; right clasper, Rochester, Minn. Fig. 29. Palmacorixa nana Walley; pala of male, Bool's Backwater, N. Y. Fig. 30. Palmacorixa nana Walley; pala of male, Bool's Backwater. N. Y. Fig. 31. Palmacorixa nana Walley; pala of male, Bool's Backwater, N. Y. Western Hemisphere Corixidae 157 PLATE XLI PALMACORIXA ABBT 17—822 258 The University Science Bulletin PLATE XLII Western Hemisphere Corixidae 259 Corisella Limdblad 1928. Lundblad, 0. Zoolog. Anzeiger, Leipzig, LXXIX, pp. 158-159. 1928. Lundblad, O. Entomologisk Tidskrift, XLVIII, Haft 4, p. 222. 1935. Poisson, R. Archives de Zoologie Experimentale et Generale, LXXVII, p. 458. 1942. Hungerford, H. B. Jl. Kansas Ent. Soc, XV, p. 63. 1943. Walton, G. A. Trans. Soc. for British Entomology VIII, p. 157. (As subg. of Trichocorixa Kirk.) In this genus the dorsal surface is smooth, shining, never more than faintly rugulose except on the pronotum. Hemelytra clothed with fine hairs. Lateral lobe of prothorax elongate, tongue-like. Front tibia of male rather long, produced above and provided with a fleshy pad or disk. The male pala triangular and provided with two rows of pegs. Male strigil dextral. Membranal suture marked by an oblique pale stripe as pointed out by Doctor Jaczewski. Genotype: C. mercenaria Say. Comparative notes: Doctor Lundblad gave as his diagnosis of the genus the following: "Takes a middle position in the structural characters between Ectennnostegella and Ectemnostega. Stridula- tory pegs as in the above genera. The tibia produced distally as in Ectemnostega. The front margin of the hemelytra lacks the pecu- liar angle which is present in Ectemnostega. Pronotal stripes small, upper side not swollen. Hind wings well developed. Asymmetry of male dextral. A strigil is developed." One cannot say, however, that the front margin of the hemelytra lacks the peculiar angle found in Ectemnostega for in a long series of females of Corisella mercenaria (Say) one finds all graduations from sharply right angulate breaks in the anterior margin to sloping expansions. Distribution: Western United States and Mexico with one species, C. tarsalis (Fieber), extending eastward to Pennsylvania. Key to Corisella Lundblad 1. Size small, never more than 6.5 mm. long; an occasional female may attain nearly 6.5 mm 2 Size larger, over 6.5 mm. long* 6 2. (1) Both segments of hind tarsus brown C. tarsalis (Fieb.) [= C. tuviida (Uhl.)] (See p. 260) First segment of hind tarsus at least, yellow, not brown 3 3. (2) Pronotum without a median longitudinal carina on anterior fourth; flight wings often reduced ; ventral surface of hind femur pubescent for more than one- third its length 4 Pronotum with a median longitudinal carina on anterior fourth ; flight wings normal ; ventral surface of hind femur pubescent for less than one-third its length 5 * An occasional female of C. mercenaria wi'l run here, but is easily separated from the other species by the hair tufts on the abdominal venter, and the angular bend in the margin of the iiemelytra. A few unusually small males of C. edulis are shorter than 6.5 mm. 260 Thk University Science Bulletin 4. (3) In brachypterous forms pronotum very slu)rt, not more than two-thirds length of vertex; middle tarsus only slightly more than one-half length of tibia; under side of hind femur about half pilose C. tarascana Jacz. (See p. 264) In brachypterous forms pronotum nearly as long as length of vertex; middle tarsus at least two-thirds length of tibia ; imder side of hmd femur slightly less than half pilose C. hidalgoensis n. Bp. (See p. 266) 5. (3) Pronotum faintly rastrate ; second segment of hind tarsus usually embrowned: synthlipsis not much broader than rear margin of an eye. Postocular space at its middle at least two times the diameter of an eye facet. C. decolor (Uhler) [= C. dispersa (Uhl.)] (See p. 267) Pronotum smooth, shining; hind tarsus not emlirowued ; synthlipsis much broader than rear margin of an eye; postocular space at its middle narrow, little more than the diameter of an eye facet. Female with a pair of hair tufts on the sixth ventral abdominal segment C. viercenuria (Say) (See p. 272) 6. (1) The dark markings of hemelytra usually in definite longitudinal series, the male pala not broader than the tibia, or at least the dorsal part not projecting above the tibia. Male vertex plainly produced. Pruinose area on corial side of claval suture long. The rear margin of last ventral abdominal segment of female nearly straight C. edulis (Champ.) (See p. 275) The dark markings of hemelytra usually not in definite longitudinal series. The male pala broader than the tibia, its dorsal margin projecting above the tibia. Male vertex not plainly produced. Pruinose area on corial side of claval suture short. Rear margin of last ventral abdominal segment of fe- male broadly medianly produced C. inscripta (Uhl.) (See p. 279) Corisella tarsalis (Fieber) (Plate XLIII, figs. 1, la-lc) 1851. Corisa tarsalU Fieber, F. X. Species Generis Cbrisa, pp. 19-20, Tab I, fig. 13. (Desc. from Pa.) 1877. Corixa tumida Uhler, P. R. Bull. U. S. Geol. Geog. Survey III, p. 454. 1895. Como tumida, Gillette, C. P. and Baker, C. F. Hemiptera of Colorado, p. 64 (Bull. 31 of Colorado Agri. Exp. Sta.). 1909. Arctocorisa tarsalis, Kirkaldy, G. W. and Torre-Bueno. J. R. de la. Catalogue in Proc. Ent. See. Washington X, p. 197. 1917. Arctocorixa tarsalis (Fieb.) Van Duzee, E. P. Catalogue of the Hemiptera of America, p. 484. 1931. Corisella texcocana Jaczewski, T. Annales Musei Zoologici Polonici IX, No. 15, p. 202, PI. XXVI, figs. 21-23; PI. XXVII, figs. 24-31; PI. XXIX, fig. 62. 1931. Sigara tarsalis (Fieb.) Lundblad, O. Zoologischer Anzeiger, Bd. 96, p. 86. (Found type in Zool. Mus. Halle — a damaged female and did not redescribe.) 1933. Corisella texcocana, Ancona, H. L. Anale.s del Instituto de Biologia IV, No. 1, pp. 53, 67, 68, fig. 17 F. (In his El Ahuautlo de Texcoco.) 1936. Corisella tumida, Walley, G. Stuart. Can. Ent. LXVIII, pp. 62-63, PI. Ill, figs. 1-6. Size: Length 5.25 mm. to 6.6 mm.; width across the hea(i 1.47 mm. to 1.93 mm. Color: (icneral facies medium to light. Ground color dusky yellow. Pronotum with about ten narrow transverse blackish bars which are narrower than the interspaces. Bars before and behind slightly abbreviated laterally, almost entire; those at the middle Western Hemisphere Corixidae 261 may be interrupted, split or furcate. Clavus weakly maculate at base, beyond with brownish reticulae from outer to inner margins, sligiitly massed along the middle but not forming series or stripes. Corium and membrane similarly reticulate, the latter may have brownish marks predominant with the margin embrowned. The embolium pale with a dark spot at its tip. Tnoracic venter and legs yellow. Dorsum and venter of abdomen nearly black in males and often so in females. Apex of middle tarsi and entire hind tarsi brown. Structural characteristics: Male with vertex noticeably tumid, almost acuminate, the rounded apex with a definite narrow carina (see Plate XLIII, fig. lb). Face strongly flattened, the flattened area not as broad as interocular space, its upper surface with fine, very short, erect hairs. The female head of normal shape. Inter- ocular space broader than an eye. Antennal segments 1 ; 2 : 3 : 4: : 20 : 12 : 37 : 18 J ; 1 : 2 : 3 : 4 : : 20 : 15 : 40 : 20 $ . Disk of pronotum polished, only faintly rastrate, a slight carina on anterior third; posterior margin evenly rounded. Hemelytra shining, not rastrate but very faintly roughened. Mesoepimeron slender, the osteole of scent gland just laterad of its tip. Metaxyphus short, triangular. The front femur of male with stridular patch of pegs near its base, the tibia as long as the pala with a stout, erect peg below its apex, and the pala as shown in Plate XLIII, figure 1, with only a single or double conspicuous peg in the upper row position. The middle leg: femur : tibia : tarsus : claws :: 100 : 44.8 : 80.4 : 44.8. The hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 88.8 : 116.6 : 46.6. The under side of hind femur bare and shining, the pilose area confined to the base and rear margin. The abdominal dorsum of male as shown on Plate XLIII, figure Ic. The strigil small, of three combs, on a rather long petiole. The male genital capsule as shown on Plate XLIII, figure la. Location of types: The type of Corixa tai^salis Fieber is a female located in the museum at Halle, Germany, where it was examined by me in 1928 and labeled "type." It was a broken specimen bear- ing the label "C. tarsalis Fieb. Penns. Zm." The pattern of the hemelytra is like that of A. utahensis paratype I had with me but the species is smaller. In frontal view the eyes seem small and the beak sknder. The hind tarsus (last segment) is embrowned and the front legs small. This is the species that Uhler described from Colorado as C. tumida but I have seen specimens from Philadelphia, Pennsylvania, and from Cold Springs Harbor, New York. The only 262 The University Science Bulletin other species with an embrowned hind tarsus is A. dakotensis Hungerford. This is a larger species and not yet recorded from Pennsylvania. The type of C. tumida Uhler from Sloan Lake near Denver, Colorado, is in the U. S. National Musemn. The type series of Corisella texcocana Jaczewski was in the Polish Museum and four specimens (2 males and 2 females) of this series were sent by Doctor Jaczewski to the Francis Huntington Snow Collection, University of Kansas. Comparative notes: This species is easily recognized by the em- browned hind tarsus, and by the front leg of the male as shown on Plate XLIII. Data on distribution: (Plate XLVI.) This species under the names C. tarsalis Fieber, C. tumida Uhler and Corisella texcocana Jaczewski has been recorded as follows: C. tarsalis Fieber, "Penns. Zm."; C. tumida Uhler, Colorado, Sloan's Lake, west of Denver, and from temporary pools in the suburbs of Denver by Packard and Uhler; "Denver, Colorado, July 12, 1903, Van Duzee collector," reported in the California Academy of Science by Walley; Corisella texcocana Jaczewski, Texcoco, Mexico, August 4, 1929, 15 males, 50 females, T. Jaczewski. In addition to the above we have or have seen the following: Canada: Manitoba, Dauphin, 1935, Mrs. M. E. Hippesley, 1 male (U. S.N. M.). . U.S.A.: New York: Cold Springs Harbor, L. I., July 28, 1920, Priscilla Butler, 1 male. Pennsylvania: Philadelphia, Oct. 18, 1908, G. M. Greene, male and female (U. S. N. M.). Wisconsin: Parco, Aug. 22, 1938, R. I. Sailer, 1 female. South Dakota: Blunt, July 19, 1937, R. H. Beamer, 3 females; Burdette, July 20, 1937, C. L. Johnston, 11 males, 9 females; Cham- berlain, Sept. 9, 1939 and June 13, 1940, H. C. Severin; Clear Lake, Aug. 11, 1939, H. C. Severin; Columbia, Sand Lake Refuge, Sept. 24, 1939, H. C. Severin; Dixon, May 26, 1940, G. B. Spawn; Eureka, June 22, 1939, H. C. Severin, 1 male; Ft. Pierre, July 20, 1939, 10 miles south, H. C. Severin; Gann Valley, June 21, 1940, 3 miles south, H. C. Severin; lona, 2 miles west, June 11, 1940, H. C. Severin; Isabel, June 25, 1940, H. C. Severin; Leola, 4 miles west, July 24, 1940, H. C. Severin; Martin, under neon lights, June 20, 1940, H. C. Severin; McLaughlin, June 21, 1939; Miller, July 20, Western Hemisphere Corixidae 263 ]937, R. H. Beamer; Mission Hill, 8 miles west, Sept. 5, 1940, H. C. Severin; Nisland, June 15, 1941, H. C. Severin; Oakwood, Brookings Co., Aug. 11, 1939, H. C. Severin; Phillip Junction, Sept. 5, 1940, H. C. Severin; Pine Ridge, field pond, Sept. 6, 1940, H. C. Severin; also June 17, 1941; Rapid City, June 18, 1941, H. C. Severin; Redfield, July 20, 1937, R. H. Beamer, 2 females; Reva, June 16, 1941, H. C. Severin; Rosebud, 3 miles east, Sept. 5, 1940, H. C. Severin; Selby, Aug. 11, 1942, G. B. Spawn; Waubay Refuge, alkali water, June 22, 1940, H. C. Severin; Walsey, 8 miles south, June 24, 1939, H. C. Severin; Winner, Sept. 8, 1939, G. B. Spawn; Wood, July 23, 1939, H. C. Severin. Oklahoma: Cimarron Co., Kenton, July 5, 1926, T. H. Hubbell, 5 males, 9 females (Mich. U.). Colorado: Colorado Springs, 5,915 ft., Aug., E. Stucker, 1 female; Denver, July 16, 1909, W. J. Gerhard (Parshley) ; Fruita, Aug. 15, 1936, M. B. Jackson, 7 males, 9 females; Hadley, Sept. 22, 1927, P. A. Readio, 1 female; Hillside, 6 miles south, Aug. 25, 1941, H. C. Severin; La Junta, Aug. 22, 1927, L. D. Anderson, 1 male, 6 fe- males; Las Animas Co., Sept. 22, 1927, P. A. Readio, 5 males, 9 females; same place, R. H. Beamer, 4 males, 1 female; Lamar, Aug. 22, 1927, P. A. Readio, 3 males, 2 females; Maybell, Aug. 18, 1940, L. C. Kuitert, 3 males, 3 females; western Colorado, Oct. 28, 1921, Grace Wiley, 1 male, 4 females. Utah: Cisco, Sept. 28, 1921, Grace Wiley, 4 males, 15 females; Cisco, Aug. 17, 1929, L. D. Anderson, 3 males, 3 females; eastern Utah, Sept. 28, 1921, Grace Wiley, 2 males; Emery Co., Aug. 22, 1921, Grace Wiley, 1 male, 3 females; Duchesne, Aug. 17, 1940, L. C. Kuitert, 1 male, 3 females; Goshen, Aug. 16, 1940, L. C. Kuitert, 11 males, 6 females; Spanish Fork, Aug. 15, 1940, L. C. Kuitert, 8 males, 9 females. Montana: Broadwater Co., L. Sewall, June 20, 1941, G. K. Mac- Millan (Carn.) Imale. California: Mammoth Lakes, July 29, 1940, L. C. Kuitert, 3 males, 1 female. Arizona: Apache Co., Aug. 16, 1927, R. H. Beamer, 2 males, 6 females; Coconimo Co., Aug. 13, 1927, P. A. Readio, 1 male, 2 fe- males; Foxborough Ranch, Aug. 1, 1936, Owen Bryant; Navajo Co., Aug. 15, 1927, R. H. Beamer, 1 female ; Oak Creek Canyon, July 9, 1941, R. H. Beamer, 1 female; Pima Co., Aug. 16, 1927, P. A. Readio, 1 male; St. Johns, July 26, 1936, M. B. Jackson, 9 males, 11 females; 264 The University Science Bulletin Santa Cruz Co., Aug. 4, 1927, P. A. Readit), 1 male; Tucson, 1935. Owen Bryant; Yavapai Co., Aug. 9, 1927, R. H. Beamer, 1 male, 1 female; Yavapai Co., June 9, 1937, L. K. Gloyd, 1 male, 4 females (Mich. U.). Neio Mexico: Chaves Co., July 8, 1927, R. H. Beamer, 1 male, 2 females; Faywood, Ma}^ 24, W. J. Gerhard (Parshley) ; Moriarty. June 23, 1941, R. H. Beamer, 1 female; Santa Cruz, Aug. -20, 1927, R. H. Beamer, 1 female; Santa Fe, July 20, 1936, J. D. Beamer, 1 male; Silver City, July 22, 1936, M. B. Jackson, 1 female; Silver City, July 24, 1936, Jose Hidalgo, 1 female; Socorro Co., Aug. 18, 1927, P. A. Readio, 1 male. 4 female.^; Wagonmound, July 18, 1936, M. B. Jack.son, 6 males, 9 females. Texas: Cedar Lane, Aug. 9, 1928, R. H. Beamer, 2 females; Pre- sidio Co., July 16, 1927, R. H. Beamer, 2 females; Randall Co., July 7, 1927, R. H. Beamer, 1 male, 3 females; Valentine, July 13, 1927, R. H. Beamer, 1 male, 1 female. Mexico: 15 kim. west of Jalapa, July 18, 1937, H. D. Thomas, 7 males, 8 females; Chihuahua, Chihuahua, July 15, 1938, H. D. Thomas, 1 male; Puebla, Puebla, July 14, 1937, H. D. Thomas, 3 males; Tehuacan, Puebla, July 18-25, 1937, H. D. Thomas, 1 male; Mexico, Texcoco, Aug. 4, 1929, T. Jaczewski. Corisella tarascana Jaczewski (Plate XLV, figs. 2, 2a-2c) 1931. Corisella tarascana Jaczew.ski, T. Annales Musei Zoologici Polonici, IX, No. 15, p. 205-207, PI. XXVII, figs. 25-31; PI. XXIX, fig. 63. 1933. Corisella tarascana. Ancona, H. L. Anale.s del Instituto de Biologia, IX, No. 1, p. 67, fig. 17B (in his El Ahuautle de Texcoco). 1935. Corisella tarascana, Poi.sson, R. Archives de Zool. Exp. et Gen., LXXVII, p. 481. Size: Length 4.3 mm. to 5 mm. Head width 1.4 mm. to 1.6 mm. Color: General facies medium to light. Pronotum with five or six dark bands, narrower than the pale interspaces and more or less broken (in macropterous individuals there may be eight dark bands). Clavus with brown cross bands which may be broken or furcate and considerably narrower than the pale interspaces; re- mainder of hemelytral pattern reticulate, the brown figures some- times fusing on the corium into two faint longitudinal series; apex of corium pale; membrane embrowned at tip, the left one pale in- teriorly ; membranal suture marked by a pale oblique line ; embolium more or less infuscated. Head, except rear margin of vertex, legs and thoracic venter usually pale; the abdominal venter of males may be nearly black; that of females pale but with last segment (anal lobes), nearly black. Western Hemisphere Corixidae 265 Structural characteristics: Vertex of male produced in front into a blunt angle (see Plate XLV, fig. 2a) ; vertex of female somewhat produced. Interocular space broader than an eye. Frontal depres- sion of male deep and broad, including inner angle of the eyes, and provided with a tuft of hairs at its apex. Antennal segments 1:2: 3 : 4 : : 15 : 12 : 30 : 10 (^ ; 1 : 2 : 3 : 4 : : 15 : 14 : 30 : 11 5 . Disk of pronotum in brachypterous specimens short, nearly three times as wide as long and only two-thirds as long as vertex in male. Pronotum very faintly rastrate, without carina. Hemelytra smooth. Mesoepimeron only moderately narrow, rounded at tip, the osteole of scent gland guarded by a broad fringe of conspicuous hairs. Metaxyphus short, broadly round at apex. The front femur of the male rather thick and short with a patch of very densely inserted thickened hairs near the base and below it about six longitudinal, short rows of pegs which resemble palar pegs but have hairlike apices; about five pegs in each row. The tibia thickened distally with a membranous process at base of the pala. The pala as shown on Plate XLV, figure 2. There may be five or six pegs in the upper row and four or five in the lower row. The middle leg: femur : tibia : tarsus : claws : : 100 : 46 : 26 : 36. The hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 83 : 103.8 : 41.5. The upper side of the hind femur with a row of about five short spines, lower side with about three spines; the lower side with fully half its surface pilose. The abdominal dorsum of male as shown on Plate XLV, figure 2c. The strigil with four combs on a pedicle. The central lobe of the seventh abdominal tergite feebly developed, deprived of long bristles. Male genital capsule as shown on Plate XLV, figure 2b.' Location of types: In the Polish Museum at Warsaw. The holo- type male from Tizapan, Jalisco, Mexico, Aug. 11, 1929, T. Jaczew- ski. The type series included specimens from Patzcuaro, Mich., Aug. 28, 1929, and some females questionably placed here from Xochimilco, D. F., and Tlalpam, D. F. Compai-ative notes: This species is near our new species, C. hi- dalgoensis, from which it is distinguished as indicated in the key. Data on distribution: (Plate XLVI.) Besides Doctor Jaczew- ski's records we have the following in the Francis Huntington Snow Collection: Mexico.- Michoacdn: Carapa, Sept. 18, 1938, H. D. Thomas, 12 females; Moreha, Sept. 4, 1938, H. D. Thomas, 4 females; Zamora, Sept. 8, 1938, H. D. Thomas, 3 males, 9 females; 20 miles east of 266 The University Science Bulletin Zitdcuaro, Oct. 28, 1938, H. D. Thomas, 3 females; Patzcuaro, Sept. 2, 1938, H. D. Thomas, 16 males, 80 females. Jalisco: Union de Tula, Sept. 10, 1938, H. D. Thomas, 22 females. Hidalgo: Durango, Sept. 4, 1938, H. D. Thomas, 1 male, 2 fe- males. Mexico: D. F., April 22-25, 1910, 2 females. Morelos: Tres Cumbres, 70 klm. south Mexico City, Oct. 1, 1936, H. D. Thomas, 24 males, 24 females. Corisella hidalgoensis n. sp. (Plate XLV, figs. 1, la-lc) Size: Length 4.4 mm. to 5.5 mm.; width of head 1.6 mm. to 1.9 mm. Color: General facies medium to light. Pronotum in brachyp- terous forms with about seven dark bands which are narrower than the pale interspaces and more or less broken in the middle of the disk. (In macropterous individuals there may be nine or ten dark bands.) Clavus with brown bands more or less broken or effaced on basal third; remainder of hemelytral pattern reticulate, the brown figures sometimes fusing on the corium in three or four faint longitudinal series; membranal suture marked by a pale oblique line; the brown figures fusing submarginally ; the left membrane pale interiorly; embolium pale; head, legs and thoracic venter pale; abdomen of male may be nearly black. Structural characteristics: Vertex of male moderately produced in front as shown on Plate XLV, figure la. Vertex of female nor- mal. Interocular space equal to width of an eye. Frontal depres- sion of the male deep and broad, embracing inner angle of the eyes, its surface with sparse covering of appressed hairs. Antennal seg- ments 1 : 2 : 3 : 4 : : 16 : 12 : 30 : 16 J ; 1 : 2 : 3 : 4 : : 16 : 15 : 32 : 16 5 . Disk of pronotum in brachypterous specimens nearly as long as the vertex and a little more than a third as long as its width. Pronotum faintdy rastrate without carina. Hemelytra smooth. Mesoepimeron narrow. Metaxyphus short, triangular. Front femur of male with inner basal half pilose but without the conspicuous stridulatory patches described for C. tarascana Jacz. The tibia and pala as shown on Plate XLV, figure 1. The middle leg: femur : tibia : tarsus : claws : : 100 : 44.8 : 30.4 : 43. The hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 85.8 : 100 : 42.9. The upper side of the hind femur with a row of six or seven short spines, lower side with about five spines; the lower side with Western Hemisphere Corixidae 267 less than half its surface pilose. The abdominal dorsum of male as shown on Plate XLV, figure Ic. The strigil of moderate size with seven combs, often partially covered by the hair tuft of the pre- ceding segment. The seventh segment rather hairy behind the strigil. Male genital capsule as shown on Plate XLV, figure lb. Location of types: Holotype, allotype and 42 paratypes (27 males, 15 females). Labeled "Mexico 1938, H. D. Thomas, Real del Monte, Hidalgo, Sept. 23, 1938, No. 29" in the Francis Hunting- ton Snow Entomological Collection, University of Kansas. Comparative notes: This species is near C. tarascana Jaczewski but both sexes have the under side of hind femur less pilose and the males are readily distinguished from that species by the less prom- inent vertex, by the femur lacking the stridular peg patches, by the crowded upper peg row of the pala, by the larger strigil, abdominal hair tufts and by the different shape of the right clasper. Data on distribution: (Plate XLVL) In addition to the type series we have the following record: Mexico: 20 mi. w. of San Luis Potosi, San Luis Potosi, Aug. 8, 1944, H. D. Thomas, 2 males. Corisella decolor (Uhler) (Plate XLIII, figs. 2, 2a-2c; wash drawing No. 10, Plate IV)' 1871. Corixa decolor Uhler, P. R. American Jl. Science, ser. 3, I, p. 106. 1875. Corisa dispersa Uhler, P. R. Wheeler's Surv. 100th Merid. V, p. 841, PI. 42, fig. 7. 1876. Corisa decolor, Uhle*, P. R. Bull. U. S. Geo. Geog. Surv. I, p. 340. 1877. Corixa decolor, Uhler, P. R. Bull. U. S. Geol. Geog. Surv. Ill, p. 455. 1893. Corisa decolor, Uhler, P. R. Proc. Ent. Soc. Wash. II, p. 384. 1909. Arctocorisa decolor, Kirkaldy, G.^ W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 195. 1909. Arctocorisa dispersa, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 195. 1917. Arctocorixa decolor, Van Duzee, E. P. Catalogue of Hemiptera, p. 479. 1917. Arctocorixa dispersa. Van Duzee, E. P. Catalogue of Hemiptera, p. 479. 1939. Arctocorixa dispersa, Millspaugh, Dick D. Field and Lab., VII, No. 2, p. 85. Siize: Length 4 mm. to 5.88 mm.; width of head 1.36 mm. to 1.9 mm. Color: General facies light to dark depending upon the width of the dark figures which may be slender or broad. Pronotum crossed by six or eight dark bands that may be much narrower than the pale interspaces, the first three effaced laterally or they may be broader than the interspaces. In either case the last three or four are united by the marginal brown line that marks the caudal margin of the pronotum. Clavus with brown bands more or less broken or effaced on basal third; remainder of hemelytral pattern reticulate with the brown bands mostly transverse; membranal suture marked by a 268 The University Science Bulletin pale oblique line; the left membrane pale interiorly; embolium white to embrowned with a dark spot beyond its apex; head, legs and thoi'acio venter pale; abdominal venter usually black in male. Structural characteristics: Vertex of male moderately produced in front as shown on Plate XLIII, figure 2b. Vertex of female nor- mal. Interocular space broader than an eye. Frontal depression of the male ovate, deep, not quite attaining inner angle of the eyes, its surface with covering of appressed hairs. The ]iostocular space at its middle at least two times the diameter of an eye facet. An- tennal segments: 1 : 2 : 3 : 4 : : 18 : 12 : 33 : 18 ^j ; 1 : 2 : 3 : 4 : : 18 : 12 : 35 : 18 5 . Pronotum moderately rastrate with a median carina on its anterior fourth. Hemelytra shining; mesoepimeron narrow; metaxyphus short, triangular. Front femur of male with inner basal half pilose, the hairs thickened at their bases. The tibia and pala as shown on Plate XLIII, figure 2. The middle leg: fe- mur : tibia : tarsus : claws : : 100 : 45.5 : 30.9 : 41.9. The hind leg: femui' : tibia : tarsus 1 : tarsus 2 :: 100 : ^'^.^ : 116.6 : 53.3. The ujiper side of the hind femur with a row of six or seven short spines, lower side with about five spines. The lower side of the femur nearly free of pilosity except at the base and along its rear margin, 'f he abdominal dorsum of male as shown on Plate XLIII, figure 2c. The strigil may be as in the figure or made up of five or six regular rows. Male genital cap«:ule as shown on Plate XLIII, figure 2a. ' Location of types: The mutilated fragment of the C. decolor Uhler type and four specimens (one mutilated male and three fe- males) of C. dispersa Uhler type series in the U. S. N. M. Corixa decolor Uhler was described in the American Journal of Science and Arts, Ser. 3, Vol. 1, p. 106, in 1871. The description was incorpo- rated in A. S. Packard's paper "On Insects Inhabiting Salt Water, No. 2." This description seems to have been drawn from a single specimen for the last sentence of the description says, ''The spec- imen described is a male whicii appears not to be fully mature. From Clear Lake." It must be noted here also that figure 7, Corisa dispersa, Plate XIAl, in Wheeler's Survey 100th Meridian V, p. 841, Plate 42, figui'e 7, 1875, does not at all correspond to the original description in the same paper nor to the insects I find that are co- types. In 1876 Uhler, in his "List of Hemiptera of the Region West of the Mississippi River" (Bull. 5, U. S. (Jeol. Geog. Surv., Vol. I), gives C. decolor and says, "From Clear Lake, California, collected by Professor Torrey. The soft and tender condition of the two Western Hemisphere Corixidae 269 specimens examined leaves a doubt of their being in fully matured condition. It is important to have full series of these insects from the various kinds of lakes, ponds, and streams, particularly from the alkaline ones, so that something may be settled respecting the in- fluence of such waters upon them." In 1877 (U. S. Geol. Surv., Vol. Ill), reporting upon the "Insects collected by P. R. Uhler during the Explorations of 1875, including Monographs of the Families Cydnidae, Saldidae and the Hemiptera collected by A. S. Packard, Jr., M. D.," Doctor Uhler writes of C. decolor, "Found by Doctor Packard on July 27 in a brook flowing into Great Salt Lake, Utah, and in the lake." In 1893 Uhler, in the Proc. Ent. Soc. of Washing- ton, Vol. II, p. 384, says of Corisa decolor Uhler, "Two specimens of large size were taken at the border of Salt Lake, July 4. The species was originally obtained from this same region but the spec- imens were smaller and less mature." I cannot locate these spec- imens. The above four references are the only records given in Van Duzee's Catalogue, 1917, and there has been none since. This means that the species has not been mentioned since 1893. I have before me a specimen from the Uhler collection labeled "co-type, U. S. N. M." and "Corixa decolor Uhler, Borax Lake, Calif." This lacks head, prothorax, abdomen and all but one hind leg. Borax Lake, I understand, is a part of Clear Lake. From this and the description we must decide the identity of C. decolor Uhler. I have also a female specimen from the Uhler collection labeled "In brook running into Salt Lake, July 27, frequent" which must be the basis of Uhler's 1877 record. Both the male cotype and the Salt Lake specimen are the same as Corisella dispersa Uhler described in 1875. I have examined several collections of Corisella dispersa (Uhler) from Clear Lake, California, one of them consisting of six specimens that are labeled "Borax Lake" which is a portion of Cl^ar Lake from which the type of Coi'isella- decolor came. Wliile the de- scription of the head of Corisella decolor Uhler fits Corisella tumida (Uliler) better than it does Corisella dispersa (Uhler) , nevertheless it can be applied to the latter and the type itself is certainly a ten- eral specimen of the latter. Unfortunately, therefore, the species we have known so well under the name Coiisella dispersa (Uhler) must be called Corisella decolor (Uhler) , which was described sev- eral years earlier, even if the name does not characterize fully de- veloped specimens. Comparative notes: This species is near C. mercenaria (Say) from which it can be distinguished by the characters given in the key. 270 The University Science Bulletin Data on distribution: (Plate XL VI.) The published records are as follows: For C. decolor Uhler: Clear Lake, California (type loc.) and Great Salt Lake, Utah. For C. dispersa Uhler: Owens Valley, California (F. Bischoff) . (type locality) ; "near Virginia City, Nevada, and in Texas," reported in the original description by Uhler. Besides examining the types above we have seen the following: U. S. A: California: San Diego, 2 females (Uhler Coll.); San Diego Co., Apr. 9, 1930, C. and D. Martin, 26 males, 18 females; San Diego Co., Sept. 13, 1913, Van Duzee; Warner Springs, July 28, 1938, R. H. Beamer, 8 males, 9 females; Miramar, July 28, 1938, R. I. Sailer, 1 male, 1 female; L. Elsinore, Aug. 2, 1911, 3 males, 8 females; Laguna Beach, July 25, 1933, R. H. Beamer, 9 males, 11 females; same place, July, 1921 (Usinger Coll.); Tejon Pass, July 28, 1918, J. 0. Martin, 1 male, 1 female; St. Helena, July 15, 1908 (Cornell), 3 males, 3 females; Fresno Co., Jacintos Barrancas, Kettleman Plains, June 4, 1907, J. C. Bradley (Cornell), 1 male, 3 females; Palo Alto, June 6, 1892 (Cornell), 1 male; Monrovia Canyon, Mar. 2, 1930, C. H. Martin, 4 males, 5 females; Los Angeles Co., July, 1 female; Santa Monica, July 31, 1911, 1 male; Santa Ana Canyon, Green River, Feb. 28, 1929, Grace Wiley (Lutz) ; near Long Beach, June 3, 1938, Grace Wiley (Lutz) ; Gaviota, July 19, 1933, R. H. Beamer, 1 male; Lompoc, Aug. 9, 1938, D. W. Craik, 2 males, 1 female; Tejon Pass, July 28, 1918, J. 0. Martin, 1 male, 1 female; Onyx, July 23, 1940, L. C. Kuitert, 1 male; Lost Hills, July 19, 1936, G. D. Hanna (Cahf. Acad. Sci.) ; Ontario, C. T. Dodds (Calif. Acad.); Idyllwild, Aug. 3, 1935, Jack Beamer, 9 males, 5 females; Carmel, L. S. Slevin (Calif. Acad.); Lucerne, July 17, 1935, Jack Beamer, 7 males, 8 females; Owens Valley, 2 females; Little Lake, June 7, 1929, R. L. Usinger (Calif. Acad.); Independence, June 13, 1929, R. L. Usinger (Calif. Acad.) ; Bishop, June 21, 1929; Little Lake, July 25, 1940, L. C. Kuitert, 2 females; Lone Pine, July 28, 1940, L. C. Kuitert, 8 males, 5 females; Mam- moth Lakes, July 29, 1940, L. C. Kuitert, 2 males, 5 females; Mono Lake, July 3, 1940, L. C. Kuitert, 7 males, 6 females; Stanford U., 2 females; Berkeley, April 26, 1933, Jean Linsdale, 2 males, 2 fe- males; Alameda, July 9, 1933, Jean Russell, 1 female; Oakland, May 3, 1921, C. T. Dodd, 1 female; Emery, May 14, 1921, C. T. Dodd, 1 female; Lafayette, July 14, 1932, R. H. Beamer, 9 males, 7 females; Vine Hill, July 5-10, 1911, F. E. Blaisdell (Calif. Acad.) ; Antioch, July 20, 1935, R. H. Beamer, 8 males, 7 females; Antioch, July 20, 1935, E. I. Beamer, 1 female; Folsom, 1885, 4 females; Western Hemisphere Corixidae 271 Sacramento Co., July, 1 male, 1 female; Clarksburg, July 21, 1931, A. T. McClay (Calif. Acad.) ; Davis (lights), June 23, 1931, George Vansell, 2 males, 2 females; Davis, July 19, 1931, F. H. Wymore (Calif. Acad.) ; Golden Gate, July 17, 1933, R. H. Beamer, 1 female; Conoma, July 4, 1926, E. H. Nast (Calif. Acad.); Yuba Co., Coquillett, 1 male, 3 females; Sutter Co., June 1, 1934, E. R. Leach (Calif. Acad.) ; Lakeport, C. C. Deonier, July 17, 1941 (U. S. N. M.) ; Borax. Lakes, Aug. 8, 1911, 1 male, 4 females; Gridley, June 10, 1931, Don Prentiss, 2 males, 1 female; Horse Camp, July 1, 1934, J. T. Howell (Calif. Acad.) ; Modoc Co., July 1, 1931, E. R. Leach (Calif. Acad.) ; Weed, June 29, 1935, R. H. Beamer, 1 female; Convict Lake, 7 females (Brues Coll.) ; California, Dec. 25, 1922, J. G. Needham, 2 females; Rio Vista, Mar. 25, 1921, C. M. Packard, 1 female (U. S. N. M.) ; Franklin, Apr. 21, 1921, C. M. Packard, 1 female (U. S. N. M.) ; Davis, Aug. 9, 1933, E. P. Zimmerman, 1 male, 6 females (U. S. N. M.). Oregon: Worden, July 1, 1935, R. H. Beamer, 12 males, 11 fe- males; Modoc Point, July 1, 1935, Jack Beamer, 1 male, 4 females; same place and date, R. H. Beamer, 27 males, 29 females; Florence, July 11, 1935, R. H. Beamer, 1 male; Boarclman, July 15, 1931, L. D. Anderson, 5 males, 4 females; Umatilla, July 14, 1931, L. D. Anderson, 1 female; Hot Lakfe, July 13, 1931, L. D. Anderson, 4 males, 9 females; same place and date, M. W. Sanderson, 5 males; so. of Worden, July 1, 1935, P. W. Oman, 13 males, 5 females (U. S. N. M.) ; Harney, Aug. 3, 1934, C. L. Hubbs (Mich. Coll.) 1 male. Idaho: Burley, July 6, 1931, L. D. Anderson, 9 males, 13 females. Nevada: Sunnyside, Hot Springs Exp. 1930, sp. no. 97, C. T. Brues, 1 male, 3 females; Esmeralda Co., Fish Lake, Sept. 5, 1934, C. L. Hubbs, 1 male (Mich. U.) ; Soda Lake, near Hazen, July 13, 1911, 2 males, 2 females; Fallon, Aug. 9, 1929, L. D. Anderson, 7 males, 1 female; Austin, Aug. 12, 1940, L. C. Kuitert, 4 males, 2 females; Fernley, June 26, 1935, R. H. Beamer, 1 male, 3 females; Carson City, Aug. 9, 1929, P. W. Oman, 8 males, 9 females; Gerlach, Hot Springs Exp. 1930, n. 100, C. T. Brues, 1 female; 29 mi. s. Winnemucca, 1 nymph; 65 mi. so. Wells, 1 female; Reno, Del Monte Ranch, July 10, 1939, P. Bartsch, 11 females (U. S. N. M.). Utah: Hooper, at light, July 21, 1940, Knowlton and Dorst, 2 males, 6 females; Emery Co., Aug. 2, 1921, Mrs. Grace Wiley, 1 male, 3 females; Spanish Forks, Aug.^ 15, 1940, L. C. Kuitert, 15 males, 10 females; Lehi, April 9, 1930, G. F. Knowlton, 1 female; Goshen, Aug. 16, 1940, L. C. Kuitert, 15 males, 7 females; Corinna, 272 The University Science Bulletin Aug. 16, 1934, F. H. Giinnell, 3 males, 1 female (Utah Coll.) ; Wells- ville, Aug. 16, 1934, Knowlton and Smith, 1 female (Utah Coll.) ; Locomotive Springs, April 10, 1930, G. F. Knowlton, 1 male, 1 fe- male (Utah Coll.) ; Far West, Feb. 7, 1934, W. L. Thomas, 3 males (Utah Coll.); Spring Creek, R. E. Nye, 1 male, 3 females (Utah Coll.) ; Spanish Forks, June 18, 1938, G. F. Knowlton, 1 female (Utah Coll.) ; Granite, June, 1936, M. W. Allen, 2 males, 1 female (Utah Coll.) ; West Bountiful, Alar. 19, 1934, H. B.. Stafford, 4 males, 2 females (Utah Coll.) ; Spanish Forks, Aug. 27, 1937, G. F. Knowlton, 1 female (Utah Coll.); Utah State Ag. Col. campus, July 28, 1937, Knowlton and Harmston, 1 female (Utah Coll.) ; Bear River Bay, Oct. 15, 1932, J. S. Stanford, 2 males, 2 females (Utah Coll.) ; Midvale, March 28, 1935, Knowlton and Thomas, 1 male (Utah Coll.) ; Provo, March 29, 1935, Knowlton and Thomas, 1 fe- male (Utah Coll.) ; Logan, Aug. 13, 1934, F. H. Gunnell, 3 males, 7 females (Utah Coll.). Colorado: Keeler, July 6, 1914, Wickham, 1 male, 1 female (Bar- ber Coll.). Wyo7ning: Lewis Lake, Hot Springs Exp. 1930, sp. no. 44, C. T. Brues, 2 males, 9 females; Squaw Lake (cold). Hot Springs Exp. 1930, sp. no. 49, C. T. Brues, 2 males, 2 females; Hot Springs Exp. 1930, C. T.. Brues, 5 males, 14 females. Montana: Broadwater Co., L. Sewall, June 20, 1941, G. K. Mac- Millan (Carnegie) 1 male, 1 female. Canada: British Columbia: Hoj^c, Aug. 1. 1931, L. D. Anderson, 1 male. Corisella mercenaria (Say) (Plate XLIII, figs. 3, 3a-3c) 1832. Corixia mercenaria Say, Thomas. Heteroptera, New Harmony, p. 39. 1851. Coriza jtiercenaria , Fieber, F. X. Species Generis Corisa, p. 43. 1857. Carixa mercenaria. Say, Thomas. Fitch Reprint, p. 811 in Trans. N. Y. State Agri. Soc, XVII. 1857. Corixa mercenaria, Guerin-Meneville, F. E. Le Moniteur Universel -.Journal Officiel de I'Empire Fran^ais, numero 330, p. 1298, Nov. 26, 1857. 1857. Corixa vierceimria, Guerin-Meneville, F. E. Bull. Soc. Zool. Acdini. W , p. 581. 1857. Corixa mercenaria, Guerin-Meneville, F. E. Bull. Soc. Ent. Fr. (3) V, pp. 148-151. 1857. Corixa mecenaria. Guerin-Meneville, F. E. Revue et Magasin de Zoologip, 2nd Ser. X, p. 526. 1858. Corixa 7necenaria, Guerin-Meneville, F. E. L'lllustration XXXII, Juillet 17, 1858, p. 47. 1869. Corixa mecenaria. Say, Thomas. Complete Writings I (ed. by LeConte), p. 367. 1876. Corixa mercenaria, Uhler, P. R. Bull. U. S. Geol. Geog. Surv. I, p. 341. 1876. Corixa mercenaria, Uhler, P. R. List of Heniiptera of the Region West of the Mis- sissippi River, p. 75. (This is a reprint of above separately paginated.) (Says "Inhabits Mexic«, C'alifornia, etc.") 1898. Carixa mercenaria. Kirkaldy, G. W. Kiit. Mo. Mag., XXXIV, p. 173. Western Hemisphere Corixidae 273 1899. Corixa mercenaria, Kirkaldy, G. W. Revue d'Ent., XVIII, p. 95, (fig. egg). 1901. Corixa 7nerceiwria, Champion, G. C. Biol. Centr. Amer. Heter. II, p. 379, PI. 22, fig. 23. 1909. Arctocorisa mercenaria, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 196. 1917. Arctocorixa mercenaria, Van Duzee, E. P. Catalogue of Hemiptera, p. 482. 1926. Arctocorixa mercenaria, Blatchley, W. S. Heteroptera of Eastern North America, p. 1086. 1928. Corisella mercenaria. Lundblad, O. Zool. Anzeiger, LXXIX, pp. 154-158, figs. 6-11. 1929. Corixa mercenaria. Hungerford, H. B. Pan-Pacific Ent., VI, No. 2, pp. 74-76 (re- ports finding Guerin's collection in Paris). 1929. Corisella mercenaria, Lundblad, O. Entomologisk Tidskrift, L, Haft 1, pp. 20-23 (compares with C. edulis). 1931. Corisella mercenaria, Jaczewski. T. Annales Musei Zoologici Polonici IX, Nr. 15, p. 202. 1933. Corisella mercenaria, Jaczewski, T. Annales Musei Zoologici Polonici IX, Nr. 21, p. 336. 1933. Corisella mercenaria. Ancona, H. L. Anales del Institute de Biologia IV, No. 1, pp. 53 and 67, fig. 17E (in his El Ahuautle de Texcoco). Size: Length 4.8 mm. to 6.8 mm.; width across the head 1.6 mm. to 1.98 mm. Color: A pale yellowish species. Pronotum crossed by eight or ten slender dark bands, some of which may be broken or furcated; the last four or five united by the marginal brown line that marks the caudal margin of the pronotum. Clavus with the slender brown lines more or less broken or effaced over the basal third ; remainder of hemelytral pattern reticulate with slender brown bands, mostly transverse; membranal suture marked by a pale oblique line; embolium white with a brown spot beyond its apex; head and legs pale; middle of thoracic venter and abdomen may be black. Structural characteristics: Vertex of the male moderately pro- duced in front as shown on Plate XLIII, figure 3b and with a faint median carina; vertex of female also somewhat produced. Inter- ocular space broader than an eye. Frontal depression of the male, deep, broadly ovate, its surface covered with appressed hairs; face of female slightly depressed. Postocular space narrow; at its mid- dle less than twice the diameter of an eye facet. The antennal segments: 1 : 2 : 3 : 4 : : 18 : 14 : 38 : 20 J^ ; 1 : 2 : 3 : 4 : : 18 : 15 : 40 : 20 5 . Pronotum smooth, shining, without rastrations, a median carina becoming faint caudally. Hcmelytra smooth, shining. Mesoepimeron slender, with the scent gland orifice, which is guarded by a slender brush of hairs, just laterad of its tip, which is quite pointed. Metaxyphus triangular, slightly wider than long. Front femur of male with inner basal half pilose, the hairs thickened at their bases. The tibia and pala as shown on Plate XLIII, figure 3. The middle leg: femur : tibia : tarsus : claws :: 100 : 46.1 : 31.8 : 46.1. The hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 91.1 : 18—822 274 The University Science Bulletin 120.5 : 55.9. The upper side of hind femur with a row of about six short spines, lower side with about five spines; the lower side of the femur nearly free of i)ilosity except at extreme base and along its rear margin. The abdominal dorsum of male as shown on Plate XLIII, figure 3c. The female with a pair of hair tufts on the sixth ventral abdominal segment, and the hemelytra usually abruptly and subangularly dilated at the sides somewhat before the middle of the marginal area. Male genital capsule as shown on Plate XLIII, figure 3a. Location of types: Say described this species from Mexico and wrote: "Passing through the market in the City of Mexico, I ob- tained a few specimens from the quantity of at least a peck, ex- posed for sale by an Aztec woman. They are made use of as food." His types are lost. However, the species is well known and has been figured by Champion and by Lundblad and further described by Jaczewski. Neotypes are hereby chosen from a series of speci- mens purchased as "Hautle" or Ahuautle by H. D. Thomas as they were being collected by the natives from Lake Texcoco. He also secured an excellent moving picture of this activity. These neotypes are in the Francis Huntington Snow Collection at the University of Kansas. Comparative notes: This species is often found in Mexican mar- kets mixed with C. edulis, C. tarsalis (Fieb.) {=:texcocana Jacz.), Krizousacorixa femorata (Guer.) , K. azteca Jacz. and Notonecta uni- fasciata Guer. Tons of these dried insects are also shipped abroad for bird or fish food, and their eggs are gathered for human food from Lake Texcoco, Mexico. Champion says that Thomas Gage, in 1625, appears to have been the first traveler who noticed that these insects were used for food in Mexico. Say's name, C. mercenaria, is, therefore, an appropriate one. The species is a little smaller than C. edulis (Champ.), and its dark markings on the hemelytra are not arranged in longitudinal series as they are in C. edidis. From C. tarsalis it is easily distinguished by having a pale hind tarsus in- stead of a dark one. Data on distribution: (Plate XLVI.) Described from specimens offered for sale in a market place in Mexico City and probably reared in Lake Texcoco nearby. Uhler, 1876, mentions California, and Kirkaldy, 1898, gives New Mexico. Champion, 1901, records Lake of Texcoco and Lago de Chalco, both of which are near Mex- ico City. Jaczewski, 1931, reports 51 males, 90 females taken Aug. 4, 1929, at Texcoco. Jaczewski, 1933, says there are 12 specimens Western Hemisphere Corixidae 275 of this species in the British Museum labeled "Bolivia" but since they were imported to London as food for pheasants, it is not cer- tain that they were actually collected in that country. It is our opinion that they were not. I have seen no specimens from Cali- fornia that would affirm Uhler's California record. I have before me a specimen labeled by Kirkaldy as C. mercenaria Say that is also labeled "Las Cruces, New Mexico, 8-6," "New Mexico, Tyler Townsend." This is the basis of Kirkaldy 's New Mexico record but the specimen is Corisella tarsalis (Fieb.), a female. It appears that as yet there are no true records of C. mercenaria (Say) in the United States. The Francis Huntington Snow Collections have a good ser- ies labeled "Lake Texcoco, Mexico, July 26, 1937, H. D. Thomas," and four females labeled "Texcoco Lake, Mexico, A. Duges." It seems strange that the many collections made by H. D. Thomas in various parts of Mexico would not have included this species that is so remarkably abundant near Mexico City. In the U. S. National Museum are the following: Brownsville, Texas (in Mexican food), Nov. 12, 1909, D. K. McMillan, 2 males, 2 females; "said to be in Nice, Mexico, all. exch. 1895", 3 females; Mexico, 2 males, 3 females. Corisella edulis (Champion) (Plate XLIV, figs. 2, 2a -2c) 1901. Corixa edulis Champion, G. C. Biol. Centr. .\mer. Heter. II, p. 380, PI. XXII, fig. 2i. 1909. Arctocorisa edulis, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 195. 1917. Arctocorixa edulis. Van Duzee, E. P. Catalogue of Heniipteia, p. 480. 1925. Arctocorixa edulis, Hungerford, H. B. Bull. Brooklyn Ent. Soc. XX, i). 142 (rec- ords Kansas, Minnesota and the east). 1926. Arctocorixa edulis Blatchley, W. S. Heteroptera of Eastern North America, pp. 1073. 1075, 1076 and 1080. 1928. Arctocorixa edulis, Hungerford, H. B. Annals Ent. Soc. Amer. XXI, p. 141, PI. VIII, figs. 9, 10 and 11 (reports reversed asymmetry). 1928. Corisella edulis, Lundhlad, O. Zool. Anzeiger, LXXIX, p. 158 (corrects Blatchley 's statement about asymmetry). 1929. Corisella edulis, Lundblad, O. Ent. Tidskrift L, Hiift 1, pp. 20-24, figs. 3-4a-g, PI. II, fig. 2. 1931. Corisella edulis, Jaczewski, T. Annales Musei Zoologici Polonici IX, Nr. 15, pp. 207, 208. 1939. Corisella edulis, Millspaugh, Dick D. Field and Lab., VII, No. 2, p. 85. 1945. Corisela edulis, Griffith, M. E. Univ. of Kansas Sci. Bull. XXX, Pt. II, No. 14, pp. 284, 292. Size: Length from 6.3 mm. in exceptionally small male to 7.98 mm. in large female; width of head 1.9 mm. to 2.48 mm. Color: General facies light to medium. Pronotum crossed by ten or twelve veiy slender transverse dark bands which may be fainter in front and even effaced laterally. Clavus with pattern effaced at 276 The University Science Bulletin inner base; remainder of hemelytron closely marked with short, transverse, undulate, irregular, dark lines, the markings so arranged as to form four irregular longitudinal series; membranal suture marked by a pale, oblique line; the left membrane pale interiorly. Embolium white, sometimes embrowned. Head, legs and thoracic venter usually pale; abdominal venter of male usually black. Structural characteristics: Vertex of male produced in front as shown on Plate XLIV, figure 2a; vertex of female slightly more pro- duced than in C. inscripta (Uhler). Interocular space broader than an eye. Frontal depression of male ovate, deep and its surface covered with appressed hairs; face of female slightly depressed. Postocular space narrow except at inner angle of the eyes. Antennal segments: 1 : 2 : 3 : 4 : : 20 : 15 : 48 : 20 j ; 1 : 2 : 3 : 4 : : 23 : 15 : 48 : 23 5 . Pronotum smooth, shining, without median carina. Hemelytra shining; pruinose area on corial side of claval suture long. Mesocpimeron narrow, the scent gland osteole just laterad of its tip. Metaxyphus varies from as wide as long to a little longer than wide. Front femur of male with inner basal half pilose. The tibia and pala as sho\\Ti on Plate XLIV, figure 2. The middle leg: femur : tibia : tarsus : claws : : 100 : 45.9 : 30.6 : 37.5. The hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 87.5 : 125 : 57.5. The upper side of the hind femur with a row of six or seven short spines, lower side with five or six spines. The lower side of hind femur nearly free of pilosity except at the base and along its rear margin. The abdominal dorsum of male as shown on Plate XLIV, figure 2c. The male genital capsule as shown on Plate XLIV, figure 2a. The last ventral abdominal segment of female with its rear margin nearly straight. Location of types: Described by Champion from three males, two of them without heads, and one damaged female in the British Mu- seum. These came from Lake of Texcoco, Mexico (A. Duges), and were apparently obtained in the market place. Comparative notes: This species and C. inscripta (Uhler) are larger species than other members of the genus and may be sepa- rated as indicated in the key. Data on distribution: (Plate XLVI.) Described from Mexico, D. F., the other published records are: Kansas, Minnesota and the east by Hungerford, 1925; Agricultural College, Miss., by Blatchley, 1926 ; from Texas as bird food in Berlin Museum, reported by Lund- blad, 1929. Those below are based on the present study. Western Hemisphere Corixidae 277 Mexico: Oaxaca: Oaxaca, Aug. 25, 1937, H. D. Thomas, 1 male. Veracruz: 15 klm. west of Jalapa, July 18, 1937, H. D. Thomas, 14 males, 16 females. Michoacdn: Carapa, Oct. 8, 1938, H. D. Thomas, 4 males, 4 fe- males; Zacupii, Sept. 1, 1938, L. J. Lipovsky, 2 males, 1 female; Morelia, Sept. 4, 1938, H. D. Thomas, 2 males, 3 females. Jalisco: Tecolotlan, Sept. 17, 1938, H. D. Thomas, 9 males, 8 fe- males; Chapala, Sept. 11, 1938, H. D. Thomas, 6 males, 9 females; Jalisco, Oct. 14, 1938, H. D. Thomas, 6 males, 58 females. ChihiMhua: Chihuahua, July 15, 1938, H. D. Thomas, 3 females; Juarez, June 18, 1934, Smith and Dimkle, 5 males, 18 females; 25 miles south of Chihuahua, July 11, 1938, L. J. Lipovsky, 8 males, 20 females. Durango: Pasaje, Mar. 28, 1932, H. Smith, 2 males, 2 females. Coahuila: Satillo, Nov. 21, 1932, L. D. Tuthill, 3 males, 3 females. Tanimdipas: San Jose, April, 1910, 1 male; Nuevo Leon, July, 1934, E. A. Bowles, 1 male (U. S. N. M.). Hidalgo: Agua Fria, July 28, 1937, H. D. Thomas, 6 males, 16 females; Rio del Monte, Sept. 23, 1938, L. J. Lipovsky, 1 male, 1 female. Puebla: Desert Pond, Dec. 17, 1940, F. N. Young, 2 males, 3 fe- males; Tehuacan, July 18-25, 1937, H. D. Thomas, 9 males, 5 fe- males; Puebla, July 24, 1937, H. D. Thomas, 13 males, 3 females; Cacaloapan, July 22, 1937, H. D. Thomas, 38 males, 46 females. San Luis Potosi: San Luis Potosi, July 4-7, 1944, H. D. Thomas, 28 males, 27 females. Distrito Federal: Chapultepec, Aug. 10, 1937, H. D. Thomas. 1 female; Lake Texcoco, July 26, 1937, H. D. Thomas, 15 males, 24 females; Mexico, Oct., 1903, I. L. Hopper, 1 male, 1 female (U. S. N. M.) ; Mexico City, 1937, P. C. Clifford, 4 females (U. S. N. M.) ; from Spratt's Turtle Food, June 22, 1932, Bishopp, 2 males, 8 fe- males. U. S. A.: Texas: Brownsville, July, 2 females, Sept. 28, 1924, Weed and Spray, 2 males, 2 females (Field Mus.) ; from Mexican food, Nov. 1909, D. K. McMillan, 1 male, 1 female (U. S. N. M.) ; San Diego, 1 male, 1 female [Heidemann Col. (Cornell U.)]; Al- fred, July 24, 1928, R. H. Beamer, 16 males, 23 females; Galveston, F. H. Snow, 1 male, 2 females; Colorado Co., April, 1922, Grace Wiley, 7 males, 12 females; Presidio Co., July 16, 1927, R. H. 278 The University Science Bulletin Beamer, 4 males, 3 females; El Paso (intercepted in mail from Mex- ico), 2 females (U. S. N. M.) ; Eastland Co., May 24, 1922, 1 female, (U. S. N.M.); Randall Co., July 7, 1927, R. H. Beamer, 3 males; Chisos Mts., Aug., 1916, J. W. Green, 1 female (U. S. N. M.) ; Texas, 1 male, C. V. Riley Coll. (Cornell U.). Arizona: Baboquivari Mts., July 16, 1932, R. H. Beamer, Jr., 8 males, 9 females: Baboquivari, July 18, 1932, R. H. Beamer, 1 fe- male; southwest edge Tucson, July 20, 1932, R. H. Beamer, 3 males, 12 females; Tucson, May, 1937, W. Benedict, 4 males, 5 females; Ruby, July 13, 1940, L. C. Kuitert, 4 males, 11 females; Ruby, July 27, 1941, R. H. Beamer, 1 male, 1 female; Santa Cruz Co., Aug. 4, 1927, Beamer and Readio, 13 males, 18 females; Patagonia, Aug. 22, 1935, R. H. Beamer, 1 male, 1 female; Douglas, Aug., F. H. Snow, 1 male, 4 females; Benson, Sept. 13, 1935, Bryant, 2 males, 2 fe- males; Chiricahua Mts., 5-6,000 ft., Aug. 16, 1927, Cave Creek, J. A. Kusche (Calif. Acad.) ; Cochise Co., July 29, 1927, R. H. Beamer, 3 females; Gila Co., Aug. 5, 1927, R. H. Beamer, 10 males, 16 fe- males; Gila Bend, Aug. 13, 1935, R. H. Beamer, 1 male. Nevada: Reno, Oct., 1939, La Rivers. Oregon: Rogue River, Sept., C. R. Biederman, 1 male, 7 females. Utah: Emery Co., Sept., 1921, Grace Wiley, 3 females; Cisco, Sept. 28, 1921, Grace Wiley, 1 male, 2 females; Eastern Utah, Sept. 28, 1922, Grace Wiley, 2 females; Springville, July 25, 1933, E. W. Anthony, 1 male (Utah Coll.). Nebraska: Monroe Canyon, Sioux Co., Aug. 4, 1908, R. W. Daw- son, 1 female (Nebr. Coll.). Kansas: Morton Co., Aug. 3, 1924, C. 0. Bare, 1 female; Meade Co., F. X. Wilhams, 1 female; Medora, July 2, 1927, P. A. Readio, 1 male; Douglas Co., Oct. 8, 1923, H. B. Hungerford, 1 male, 2 fe- males; Douglas Co., Oct. 28, 1921, Robert Guntert, 1 male; Douglas Co., May 10, 1919, W. E. Hoffman, 1 female; Stubbs Pond, Law- rence, Nov. 17, 1922, H. B. Hungerford, 1 male, 1 female; Leaven- worth Co., June 27, 1934, E. P. Breakey, 1 female; Doniphan Co., Oct. 24, 1924, Jean Linsdale, 1 female; same place, July 19, 1924, E. P. Breakey, 4 males, 1 female; same place, July 20, 1924, R. H. Beamer, 2 males, 1 female. Oklahoma: Cimarron Co., July 5, 1926, T. H. Hubbell, 2 males (Mich. Coll.) ; Tulsa Co., Mar. 16, 1922, Grace Wiley, 1 male, 1 fe- male. Mississippi: Fulton, July 14, 1930, R. H. Beamer, 1 female; Ag. Col., Aug. 20, 1913, J. G. Hester, 1 female (Miss. Coll.). Western Hemisphere Corixidae 279 Minnesota: Becker Co. Iowa: Ames, Oct. 13, 1931, Hazel Beck, 2 males, 1 female. (U. S. N. M.); Ames, Nov. 5, 1931, Lloyd Andre, 1 male (U.S. N. M.). Tennessee: Lake Co., July 8, 1941, Lucile Rice, 2 males, 10 fe- males; Clarksville, Aug. 13, 1915, D. M. DeLong. 1 male (Drake Coll.). District of Columbia: Washington, June 11, Oct. 9, 1890 (Heide- mann Coll., Cornell U.). Georgia: Wicksburg, July 22, 1929 (Ball Coll. in U.S.N.M.), 1 male. Corisella inscripta (Uhler) (Plate XLIV, figs. 1, la-lc) 1894. Corisa inscripta Uhler, P. R. Pvoo. Calif. Acad. Sci. (Ser. 2), IV, p. 294. lltOl. Corixa inscripta. Champion, G. C. Biol. Central Amer. Heteroptera II, p. 37C. 1909. Arctocorisa inscripta, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 195. 1917. Arctocorixa inscripta. Van Duzee, E. P. Catalogue of Hemiptera, p. 481. 1939. Arctocorixa inscripta, Millspaugh, Dick D. Field and Lab. VII, No. 2, p. 85. Size: Length usually 7 mm. to 8 mm. but varies from 6.1 mm. in exceptionally small males to 8.4 mm. in females. Color: General facies light to dark; the brown lines and figures a little broader and less often effaced than in C. edulis; those of hemelytra not in longitudinal series as they usually are in C. edulis. The pronotum crossed by ten to fifteen slender transverse brown bands, usually a dozen or more. The brow^n bands on the base of the clavus may be slender, broken or effaced but when effaced, the immaculate spot never covers more than one- fourth of clavus; else- where on hemelytra the brown lines are transverse, irregular, often l)roken or furcated and jt)ined to others; membranal suture marked by a pale oblique line; left membrane pale interiorly; embolium usually white but may be embrowned. Head, legs and thoracic venter usually pale; abdominal venter of male usually black. Structural characteristics: Vertex of male less produced than in C. edulis. See Plate XLIV, figure la. Vertex of female normal. Interocular space broader than an eye. Frontal depression of male broadly ovate, deep and covered with appressed hairs; face of fe- male slightly depressed. Postocular space narrow except at inner angle of the eyes. Antennal segments : 1 : 2 : 3 : 4 : : 22 : 20 : 40 : 22 J^ ; 1 : 2 : 3 : 4 : : 25 : 20 : 45 : 25 5 . Pronotum smooth, shining, without a median carina. Hemelytra shining; pruinose area on corial side of claval suture short. Mesoepimeron narrow, the scent 280 The University Science Bulletin gland osteole just laterad of its tip. Metaxyphus triangular, wider than long. Front femur of male with inner basal half pilose. The tibia and i^ala as shown on Plate XLIV, figure 1. The middle leg: femur : tibia : tarsus : claws : : 100 : 43.9 : 33.3 : 39.9. The hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 92.5 : 125 : 57.5. The upper side of the hind femur with about six short spines in a row; lower side with four or five widely spaced short spines. The lower side of the hind femur nearly free of pilosity except at the base and along its rear margin. The abdominal dorsum of male as shown on Plate XLIV, figure Ic. The male genital capsule as shown on Plate XLIV, figure lb. The last ventral abdominal seg- ment of female with its rear margin medianly produced. Location of types: Of the type series Uhler says "Specimens were collected near Cape St. Lucas by John Xanthus. Numerous speci- mens in the collection of the California Academy are labeled 'Cal. 2'." A pair of these "Cal. 2" are in the Uhler collection at the U. S. N. M. and are herewith designated as the lectotypes. Comparative notes: Perhaps slightly more robust than C. edulis and even more variable in size. The two species have been badly mixed in collections. When unusually small males under 6.5 mm. are encountered of either species, the absence of a median carina on the pronotum will separate them from C. decolor and C. mercenaria, and their hind femora are less pilose than in C. tarascana and C. hidalgoensis. See section AA of the key for separating C. in- scripta and C. edulis. Data- on distribution: (Plate XLVI.) The published records are as follows: Following the description Doctor Uhler says "The species is also known to me from specimens collected in Texas, Orizaba and elsewhere in Mexico, Arizona, New Mexico and south- ern Colorado." No one else since then has added to the above state- ment and I have not found the specimens upon which Uhler based his records. Our own records are: California: San Diego Co., (Poway Val.), April 9, 1930, C. and D. Martin, 13 males, 8 females; San Diego Co., July 4, 1929, L. D. Anderson, 1 female; San Diego, G. H. Field, 2 males, 1 female (0. Heidemann Col., Cornell U.) ; Los Angeles Co. (near Long Beach), June 3, 1938, G. 0. Wiley, 1 male, 1 female; San Clcmente L, Ai>ril 12, 1920, 2 males, 3 females; San Clemente I., April 12, 1923, J. G. Needham, 5 males, 20 females; Laguna Beach, July 25, 1923, R. H. Beamer, 11 males, 9 females; Los Angeles Co., 1 male, 1 female (Uhler Coll., U. S. N. M.) ; Los Angeles, April 21, 1930, 1 male (U. Western Hemisphere Corixidae "Zbl S. N. IM.) ; Lompoc, Aug. 9, 1938, D. W. Craik, 6 males, 8 females; Lost Hills, July, 1936, G. D. Hanna, 1 male; Idyllwild, Aug. 3, 1935, Jack Beamer, 1 male, 2 females; Monterey, May 5, 1923, L. S. Slevin (Calif. Acad.) ; Carmel, April 8, 1928, L. S. Slevin, (Calif. Acad.) ; Fresno, E. A. Schwarz, 1 male; Santa Cruz, Feb. 27, 1925, L. S. Slevin (Calif. Acad.) ; San Francisco, July 9, 1911, E. C. Van Dyke (Calif. Acad.) ; Berkeley, Sept. 23, 1915, E. C. Van Dyke (Calif. Acad.) ; Stockton, F. E. Blaisdell (Calif. Acad.) ; San Joa- quin Co., July 15, 1909, L. S. Slevin (Calif. Acad.) ; Alpine, July 9, 1929. P. W. Oman, 1 female; Alpine, July 9, 1929, L. D. Anderson, 1 female; Alpine, July 9, 1929, R. H. Beamer, 1 female; Sutter Co., June 1, 1934, E. R. Leach (Calif. Acad.) ; Borax Lake in Lake Co., Aug. 8. 1911, 3 males, 2 females; Oroville, June 24, 1927, H. H. Keifer (Calif. Acad.); Franklin, Apr. 21, 1921, C. M. Packard, 3 males, 3 females (U. S. N. M.) ; Palo Alto, March 3, 1892, 1 male, 1 female, (Cornell) ; Imperial Co., Brawley, Aug. 8, 1914, J. C. Brad- ley, 1 male, 4 females (Cornell). Oregon: Worden, July 1, 1935, R. H. Beamer, 3 males, 3 females; same date and place, R. H. Beamer, Jr., 3 males, 1 female; same date and place, J. D. Beamer, 2 males, 1 female; same date and place, Jean Russell, 2 males, 3 females; so. of Worden, July 1, 1935, P. W. Oman, 3 males, 1 female (U. S. N. M.). Washington: Paha, June 9, 1920, L. McElroy, M. C. Lane, 1 male, 2 females (U. S. N. M.). Idaho: Carey, July 27, 1926, J. S. Stanford, 1 male; Moscow, 1 male, 3 females (Bueno). Utah: Cisco, Aug. 17, 1929, L. D. Anderson, 1 male; Cisco, Sept. 28, 1921, G. 0. Wiley, 2 males; Emery Co., Sept. 17, 1921, G. O. Wiley, 1 male. Arizona: Roosevelt Lake, Sept. 2, 1935, F. H. Parker, 1 female (U.S.N.M.). 282 The University Science Bulletin PLATE XLIII Corisella I>undblad Fig. 1. Corisella tarsalis (Fieber) \=tumida (Abbott)]; pala of male. Fig. la. Genital capsule of male. Fig. lb. Head of male. Fig. Ic. Dorsal view of male abdomen. Fig. 2. Corisella decolor (Uhler) [=dispersa (Uhler)]; pala of male. Fig. 2a. Genital capsule of male. Fig. 2b. Head of male. Fig. 2c. Dorsal view of male abdomen. Fig. 3. Corisella mercenaria (Say) ; pala of male. Fig. 3a. Genital cap.sule of male. Fig. 3b. Head of male. Fig. 3c. Dorsal view of male abdomen. Western Hemisphere Corixidae 283 PLATE XLIII 2 C decolor ijJhlX=(lis(iersa Uhl) 3. C. mefcenofio (Say) CORISELLA LUNDBL 284 The University Science Bulletin PLATE XLIV Corisella Lundblad Fig. 1. Corisella insciipta (Uhler) ; pala of male. Fig. la. Head of male. Fig. lb. Genital capsule of male. Fig. Ic. Dorsal view of male abdomen. Fig. 2. Corisella edulis (Champion) ; pala of male. Fig. 2a. Head of male. Fig. 2b. Genital capsule of male. Fig. 2c. Dorsal view of male abdomen. Western Hemisphere Corixidae 285 PLATE XLIV 2 C edii/rs [ChamQ] 286 The University Science Bulletin PLATE XLV Consella Lundblad Fig. 1. Corisella hidalgoensis n. sp.; front leg of male. Fig. la. Head of male. Fig. lb. Genital capsule of male. Fig. Ic. Dorsal view of male abdomen. Fig. 2. Corisella tarascana Jaczewski ; front leg of male. Fig. 2a. Head of male. Fig. 2b. Genital capsule of male. Fig. 2c. Dor.e la Torre: (1908b). A Catalogue of American Aquatic and Semi-Aquatic Hemiptera. Proc. Ent. Soc. Wash., vol. 10, No. 3-4, pp. 173-215. 23. LuNDBLAD, 0. (1928). Beitrag zur Kenntnis der Corixiden, I. Ent. Tidsk., vol. 48, Haft 4, pp. 219-243. 24. (1929a). Beitrag zur Kenntnis der Corixiden, II. Op. cit., vol. 50, ' Haft 1, pp. 17-47. 25. (1929b). Uber einigen Corixiden des Berliner Zoologischen Mu- seums. Arch. f. Hydrobiol. u. Planktonkunde, Bd. 20, pp. 296-321. 26. (1931). Uber die Corixiden des Zoologischen Museums in Halle, nebst einer Ubersicht der Gattung Trichocorixa. Zool. Anz., Bd. 96, Heft %, pp. 85-95. *27. McAtee, W. L. (1922). A Shower of Corixidae (Heter.). Ent. News, vol. 33, p. 88. 28. Pbarse, a. S. (1932). Animals in Brackish Water Ponds and Pools at Dry Tortugas. Carnegie Institution of Washington Publication No. 435, pp. 125-142. *29. PoissoN, R. (1928). Notes sur deux Corixidae (Hem.-Het.), Arctocorisa carinata (C. Sahib.) et Neocorixa vermiculata (Put.), leur repartition geographique. Bui. Soc. Zool. de France, vol. 52, p. 469. *30. (1935). Les Hemipteres aquatiques Sandaliorrhyncha Born, de la Fauna Frangaise. Arch, de Zool. Expt. et Gen., vol. 77, p. 457. 31. Rau, Phil (1943). The Neon-sign Dance of the Water-Boatman, Trico- corixa Isic] verticalis Fieb. (Hemiptera). Ent. News, vol. 54, No. 10, pp. 258-259. *32. Reuter, O. M. (1882). Ad cognitionem Heteropterorum Africae Occi- dentalis. ofvers. af Finska Vetensk. Soc. Forhandl., vol. 25, p. 42. 33. Sailer, R. I. (1946). The Synonymy and Distribution of Trichocorixa reticulata (Guerin-Meneville), Hemiptera: Corixidae. Proc. Hawaii. Ent. Soc, vol. 12, No. 3, pp. 617-620. 34. Say, T. (1832). Description of New Species of Heteropterous Hemiptera of North America, 58 pp. New Harmony, Ind., Le Conte, Complete Writings of Thomas Say, vol. 1, p. 366. 372 The University Science Bulletin 35. Stal, C. (1859). Hemiptera. In Kongl. Sv. Fregattens Eugenies resa emkring jorden under bcfal af C. A. Virgin aren 1851-1853. Zoologi, vol. 4, pp. 219-298. Stockholm. 36. Uhler, p. p. (1894). On the Hemiptera-Heteroptera of the Island of Grenada, West Indies. Zool. Soc. Proc. [London], vol. for vear 1894, pp. 167-224. 37. V.^N DuzEE, E.ftP. (1917). Catalogue of the Hemiptera of America North of Mexico Excepting the Aphididae, Coccidae and Aleurodidae. Calif. Univ., Pubs., Ent. II, vol. 14, 902 pp. 38. W.^LLEY, G. S. (1930). Heteroptera from the North Shore of the Gulf of St. Lawrence. Canad. Ent., vol. 62, No. 4, pp. 75-91. 39. White, F. Buch.an.'VN (1877). Descriptions of Heteropterous Hemiptera Collected in the Hawaiian Islands by the Rev. T. Blackburn, No. 1. Ann. and Mag. Nat. Hist., vol. 4, No. 20, p. 114. *40. Young, F. A. (1927). Weather on the Atlantic and Pacific Oceans. Monthly Weather Rev., vol. 55, pp. 341-342. PLATE XLVII Fig. 1. Trichocorixa borealis, pala, $. Fig. 2. T. horealk, right clasper, $ . Fig. 3. T. borealis, left clasper. $ . Fig. 4. T. borealis, dorsum of abdomen, $ . Fig. 5. T. louisianae, dorsum of abdomen. Fig. 6. T. louisianae, pala. Fig. 7. T. louisianae, light clasper. Fig. 8. T. louisianae, left clasper. Fig. 9. T. kanza, right clasper. Fig. 10. T. kanza, left clasper. Fig. 11. T. kanza, pala. Fig. 12. T. kanza, donsum of abdomen. Western Hemisphere Corixidae 373 PLATE XLVII 7 BOREALIS T. LOUISIANAE v-^ T. KANZA 374 The University Science Bulletin PLATE XLVIII Fig. 13. Trichocorixa uhleri, pala, $ . Fig. 14. T. uhleri, left clasper. Fig. 15. T. uhleri, right clasper. Fig. 16. T. uhleri, dorsum of abdomen. Fig. 17. T. arizonensis, dorsum of abdomen. Fig. 18. T. arizonensis, left clasper. Fig. 19. T. arizonensis, right clasper. Fig. 20. T. arizonensis, pala. Fig. 21. 2'. parvula, pala. Fig. 22. T. parvula, right clasper. See text fig. 4. Fig. 23. T. parvula, left clasper. Fig. 24. T. parvula, dorsum of abdomen. Fig. 25. T. confusa, right clasper. Fig. 26. T. confusa, left clasper. Fig. 27. T. conjusa, pala. Fig. 28. T . conjusa, dorsum of abdomen. Western Hemisphere Corixidab 375 PLATE XLVIII T. UHLERI r ARIZONENSIS T. PARVULA 26 0. T. CONFUSA 376 The University Science Bulletin PLATE XLIX Fig. 29. Trichocorixa calva, pala, $ . Fig. 30. T. calva, right clasper. Fig. 31. T. calva, left clasper. Fig. 32. T. calva, dorsum of abdomen. Fig. 33. T. orinocoensis, dorsum of abdomen. Fig. 34. T. orinocoensis, pala, $ . Fig. 35. T. orinocoensis, right clasper. Fig. 36. T. orinocoensis, left clasper. Fig. 37. T. mendozana dar-pomorza, right clasper. Fig. 38. T . mendozana dar-pomorza, left clasper. Fig. 39. T. mendozana darrpomorza, pala (redrawn after Jaczewski). Fig. 40. T. mendozana mendozana, right clasper. Fig. 41. T. mendozana mendozana, left clasper. Fig. 42. T. mendozana mendozana, pala, $ . Fig. 43. T. mendozana mendozana, dorsum of abdomen. Western Hemisphere Corixidae 377 PLATE XLIX T. MENDOZANA DAR-POMORZA T. MENDOZANA MENDOZANA 378 The University Science Bulletin PLATE L Fig. 44. Trichocorixa reticulata, pala, $ . Fig. 45. T. reticulata, right clasper. • Fig. 46. T. reticulata, left clasper. Fig. 47. T. reticulata, dorsum of abdomen. (Additional figures of structural variation, PI. VIII.) Fig. 48. T. beebei, dorsum of abdomen. Fig. 49. T. beebei, pala, $ . Fig. 50. T. beebei, left clasper. Fig. 51. T. beebei, right clasper. Fig. 52. T. macroceps, pala, $ . Fig. 53. T. macroceps, right clasper. P^g. 54. T . macroceps, left clasper. Fig. 55. T. macroceps, dorsum of abdomen. Fig. 56. T. minima, pala, $ . Fig. 57. T . viinima, right clasper. Fig. 58. T. minima, left clasper (see figs. 125, 126). Fig. 59. T. miiiima, dorsum of abdomen. Fig. 60. T. naias, pala, $ . Fig. 61. T. naias, right clasper. Fig. 62. T. naias, left clasper (see figs. 117, 118, 119, 120, 121, 122, 123, 124). Fig. 63. T. naias, dorsum of abdomen. Western Hemisphere Corixidae 379 PLATE L 380 The University Science Bulletin PLATE LI Fig. 64. Trichocorixa verticalis verticalis, pala, $ . Fig. 65. T. verticalis verticalis, right clasper. Fig. 66. T. verticalis verticalis, left clasper. Fig. 67. T. verticalis verticalis, dorsum of abdomen. Fig. 68. T. verticalis interiores, dorsum of abdomen. Fig. 69. T. verticalis interiores, left clasper. Fig. 70. T. verticalis interiores, right clasper. Fig. 71. T. verticalis interiores, left clasper. (Fallon, Nev.) Fig. 72. 7\ verticalis interiores, right clasper. (Fallon, Nev.) Fig. 73. T. verticalis saltoni, left clasper. Fig. 74. T. verticalis saltoni, right clasper. Fig. 75. T. verticalis californica, left clasper. Fig. 76. T. verticalis californica, right clasper. Fig. 77. T. verticalis var. sellaris, left clasper. (Cold Springs Harbor, N. Y.) Fig. 78. T. verticalis var. sellaris, right clasper. (Cold Springs Harber, N. Y.) Fig. 79. T. verticalis var. sellans, left clasper. (Beaufort, N. C.) Fig. 80. T . verticalis var. sellaris, right clasper. (Beaufort, N. C.) Fig. 81. T. verticalis fenestrata, left clasper. Fig. 82. T. verticalis fenestrata, right clasper. Fig. 83. T. verticalis fenestrata, dorsum of abdomen. Western Hemisphere Corixidae 381 PLATE LI T. V VAR SELLARIS T V FENESTRATA 83 F 382 The University Science Bulletin PLATE LII • Fig. 84. Trichocorixa calva, venter of abdomen, $ . Fig. 85. T. mendozana mendozana, venter of abdomen, S . Fig. 86. T. verticalis verticalis, venter of abdomen, $ . Fig. 87. T. kanza, venter of abdomen, $ . Fig. 88. T. parvida, venter of abdomen, $ . Fig. 89. T. confusa, venter of abdomen, 2 . Fig. 90. T. parvula, head as viewed from above, $ . Fig. 91. T. confusa, head as viewed from above, S . Fig. 92. T. uhleri, head as viewed from in front, $ . Fig. 93. T. arizonensis, head as viewed from in front, $ . Fig. 94. T. reticulata, head as viewed from in front, $ . (Santa Monica, Cal.) Fig. 95. T. verticalis verticalis, head as viewed from in front, $ . Fig. 96. T. verticalis verticalis, head as viewed from in front, $ . (Puerto Rico.) Fig. 97. T. verticalis verticalis, head as viewed from in front, 5 . Fig. 98. T. verticalis verticalis, head as viewed from in front, 5 . (Pueblo Nuevo, Matanza, Cuba.) Fig. 99. T. verticalis var. sellaris, head as viewed from in front, 5 . (Ab- bott's holotype, Brunswick, Ga.) Fig. 100. T. verticalis var. sellans, head as viewed from in front, $ . (Cold Springs Harbor, N. Y.) Fig. 101. T. verticalis fenestrata, head as viewed from in front, $. Fig. 102. T. verticalis interiores, head as viewed from in front, 2 . Fig. 103. T. verticalis interiores, head as viewed from in front, 2 . (Fallon, Nev.) Fig. 104. T. verticalis saltoni, head as viewed from in front, 2 . Fig. 105. T. verticalis calijornica, head as viewed from in front, 2 . Western Hemisphere Corixidae 383 PLATE LII r CALVA T KANZA T MENDOZANA^MENDOZANA T. V VERTIGALIS T PARVULA T.CONFUSA 90 T PARVULA 9, j CONFUSA 92. T UHLERI 93 T ARIZONENSIS 94 T RETICULATA 95 A TV VERTICAUS 96 A 97 A. 98 A. 99B-T V VAR SELLARIS 100 B , 0/ T. V FENESTRATE 102 C. T V INTERIORES 103 C. 104. T V SALTONI 105 T V. CALIFORNICA 384 The University Science Bulletin PLATE LIII Fig. 106. Trichocorixa verticalis veriicalis, right claspcr. (Cameron County, Tex.) Fig. 107. T. verticalis verticalis, left clasper. (Cameron County, Tex.) Fig. 108. T. verticalis verticalis, right clasper. (Pueblo Nuevo, Matanzas, Cuba.) Fig. 109. T. verticalis verticalis, left clasper. (Pueblo Nuevo, Matanzas, Cuba.) Fig. 110. T. verticalis verticalis, right clasper. (Puerto Rico.) Fig. 111. T. verticalis verticalis, left clasper. (Puerto Rico.) Fig. 112. T. macroceps, left clasper. (Battle Creek, Mich.) Fig. 113. T. macroceps, left clasper. (Staten Island, N. Y.) Fig. 114. T. macroceps, left clasper. (Cold Springs Harbor, N. Y.) Fig. 115. T. macroceps, left clasper. (Boardman, N. C.) Fig. 116. T. macroceps, left clasper. (Macon, Ga.) Fig. 117. T. itaias, left clasper. (Redrawn from Hungerford's manuscript sketch of type of Corixa sexlineata Champ.) Fig. 118. T. naias, left clasper. (Cardel, 30 miles west of Vonicruz, Mex- ico.) Fig. 119. T. naias, left clasper. (Rio Francisco, Veracruz, Mexico.) Fig. 120. T. naias, left clasper. (Ciudad del Carmen, Campeche, Mexico.) Fig. 121. T. naias, left clasper. (Ciudad del Carmen, Campeche, Mexico.) Fig. 122. T. naias, left clasper. (Jackson County, Tex.) Fig. 123. T. naias, left clasper. (St. Paul, Minn.) Fig. 124. T. naias, left clasper. (North Branch, Minn.) Fig. 125. T. minima, left clasper. (Hilliard, Fla.) Fig. 126. T. minima, left clasper. (Palpite Cienaga de Zapute, S. C. Prov., Cuba.) Fig. 127. T. mendozana dar-pomorza, strigil. (Redrawn from Jaczewski.) Fig. 128. T. mendozana dar-pomorza, right clasper. (Redrawn from Jac- zewski.) Fig. 129. T. mendozana dar-pomorza, left clasper. (Redrawn from Jac- zewski.) Fig. 130. T. mendozana mendozana, left clasper. (Redrawn from Jaczew- ski.) Fig. 131. T. mendozana mendozana, right clasper. (Redrawn from Jac- zewski.) Fig. 132. T. mendozana mendozana, pala. (Redrawn from Jaczewski.) Fig. 133. T. mendozana mendozana, dor,- '^ h ■^ x'^v^ \\ / \' / / V ^ ^ ^ s^ \ ^'-s-wWtSX / l/^/r V "C #-.XIV 408 The University Science Bulletin Pseudocorixa Jaczewski 1931. Jaczewski, T. Annales Musei Zoologici Polonici, Tom IX, Nr. 15, p. 220. (New genus for Coriia guatemalensis Champion, which is the genotype.) 1936. Poisson, R. Archiv. de Zool. Exp. et Gen. LXXVII. p. 458. In characterizing this new genus Doctor Jaczewski gives the fol- lowing: "Abdominal asymmetry in the males sinistral. Genital armatm^e of the males directed leftwards. Strigil present. Front tibiae of males thickened apically but not produced triangularly over the base of the pala. Pala with two rows of stridulatory pegs, one of them (the inner one) continued by a row of unmodified bristles. Pronotal disk, clavus and base of corium rastrated. Mem- branal suture marked by an oblique pale stripe. Lateral lobes of the prothorax tongue-like, rounded at the apex. "Generic Type: Pseudocorixa guatemalensis (Champion) = Co- rixa guatemalensis Champion, 1901. "The proposed new genus differs from all other genera of Corixidae with sinistral abdominal asymmetry in the males by the characters offered by the structure of the front tibiae and palae of the males._ From Trichocorixa Kirk., Trichocorixella gen. n. and Heliocorisa Lundbl. it is easily separated, besides the above, by the pattern of the hemelytra which shows a pale oblique stripe between corium and membrane. From Corixa Geoffr. it differs also by the shape of the lateral lobes of the prothorax, and frt)m Neocorixa Hung, by the presence of a well developed strigil. "The sinistral species 'Corixa' tvilliamsi Hung., from Ecuador, does not seem to belong to Pseudocorixa gen. n., but I am unable to say at present anything definite concerning its generic position." Since we have before us three species that are very near relatives of Pseudocorixa guatemalensis, all of them with dextral males, it seems advisable to revise the original description of the genus. While in most generic groups the males of all species are either all dcxtral or all sinistral, here is a group of species that must be congeneric in spite of the fact that th.e males of one species are sinistral and those of the other species are dextral. When we bear in mind that in certain species of Corixidae, such as Krizousacorixa jemorata (Guer.) for example, frequent cases of reversal are found, it is not strange to find species of opposite symmetry within a genus. All of the species we assign to Pseudocorixa fit the following description : Short, compact species. Head as seen from above short. Post- ocular space narrow except at inner angle. Subocular space narrow. Face nearly glabrous. Facial impression of male not usually very Western Hemisphere Corixidae 409 strong. Pronotum short and broadly rounded behind. Pronotal disk, clavus and base of coriiim rastrate; distal half of corium shiny, often semihyaline, with pattern partially cfTaced. In well pigmented specimens the membranal suture of the right hemelytron may be marked by a pale line but the membrane of the left heme- lytron always has the pattern effaced. Embolar area broad. The pruinose area of the embolar groove posterior to the nodal furrow short, not more than 3/7 the length of the cubital ridge and shorter than the pruinose area along the claval suture. Lateral lobe of the pronotum linguiform. Metaxyphus elongate. Anterior tibia with an apical comb of spines. A little more than half of the under side of the hind femur pubescent. Asymmetry of male, sinistral in one species, dextral in four species. Strigil present. The lobes of the eighth abdominal segment of male nearly normal. The anterior tibia of the male produced on outer distal margin. The male pala has longer pegs in distal end of the row and there are some pegs in the upper palmar row of bristles, the distal bristles stout. Middle femora of both sexes with a longitudinal groove on the ventral surface, except in P. conata (Hungerford) and possibly in P. ocotlanensis (Jacz.). Comparative notes: This genus is nearest to Morphocorixa Jacz., from which it differs in possessing a strigil, in having nearly normal lobes of the eighth abdominal segment, and in having a longitudinal groove on the ventral ■ surface of the middle femur in three and possibly four of the five species. Distribution: Southwestern United States south to Guatemala. The following key will separate the species : 1. Males 2 Females* 6 2. (1) Males dextral 3 Males sinistral. Pala and genitalia as on Plate LXV. P. guatemalensis (Champ.) (see p. 410) 3. (2) Strigil at end of a long pedicle P. conata (Hungerford) (see p. 414) Strigil not at end of a long pedicle 4 4. (3) Fifth abdominal tergite with a prestrigilar tuft of stiff hairs 5 Fifth abdominal tergite without a prestrigilar tuft of stiff hairs. P. beameri (Hungerford) (see p. 411) 5. (4) Median lobe of seventh abdominal segment broadly rounded. P. beameroidea (Hungerford) (see p. 413) Median lobe of seventh abdominal segment not broadly rounded. P. ocotlanensis (Jaczewski) (see p. 41(i) * No females of P. ocotlanensis are known. 410 The University Science Bulletin fi. (1) With (inly the claw of middle leg extending beyond tip of the abdomen 7 With at least half of the tarsus of the middle leg extending beyond tip of abdomen 8 7. (6) Basal half nf corium moderately rastrate P. beameri (Hungerford) (see p. 411) Basal half of corium only faintly rugulose P. giiatemalensis (Champ.) (see p. 410) 8. (6) With distal end of middle tibia attaining tip of abdomen. P. conata (Hungerford)** With the tarsus of the middle leg extending for half its length beyond tip of abdomen P, beameroidea (Hungerford) (see p. 413) Pseudocorixa guatemalensis (Champion) (Plate LXV, three figs. ; wash drawing No. 9, PI. IV) 1901. Corixa giintemalensis Champion, G. C. Biol. Centr.-Amer. Rhynch., Vol. II, p. 377. Tab. 22, figs. 19, 19a, 19b. 1901. Arctocarisa guatemalensis, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Proc. Ent. Soc. Washington, X, p. 195. 1928. Corixa guatema'ensis, Hungerford, H. B. Annals Ent. Soc. Amer., XXI, p. 144, PI. VIII, fig. 5. 1931. Pseudocorixa guatemalensis, Jaczewski, 1. Annales Musei Zoologici Polonici, Tom. IX, Nr. 1.5, p. 221-223. PI. XXVIII, figs. 52-58; PI. XXIX, fig. 68. Size: Length 5.5 mm. to 5.75 mm. Width of head 1.78 mm. to 1.99 mm. Color: General facies typically dark. Tlie pronotum crossed by 7 or 8 brown bands, the last one on the caudal margin. The hemel- ytral pattern not contrasting, often indistinct; basal brown lines of clavus usually entire. Distal ones furcate. Those of corium un- dulate, furcate and here and there connected. Usually effaced from the distal angle of the corium and on the membrane. Embolar groove usually brown to black. Venter and legs unusually i^ale for so dark a bug. Structural characteristics: Head, viewed from above, about half as long as the pronotal disk. Facial impression of the male distinct but not very strong, rather narrow, scarcely touching laterally the inner margins of the eyes. Frontal arch not prominent. Fourth segment of antenna 45.2% of the length of the third. Pronotal disk nearly twice as wide as long without a discernible median keel. Lateral angles nearly truncated, widely rounded in front, with a small pointed angle posteriorly. The front leg of male as shown on Plate LXV. Two rows of stridulatory pegs on the pala, the upper one with about 18 pegs, the distal ones longest. The lower row of 4 pegs in the upper palmar row of bristles terminating it before the middle of the pala. After an interval the palmar row continues as ** Although we have no females of P. conata, it is reasonable to suppose that the female of this species would agree on this character with the males since the males and females of the other species agree. Western Hemisphere Corixidae 411 stout, somewhat shortened, bristles. The distal end of the middle tarsus barely reaching the tip of the abdomen. Jaczewski gives the following leg measurements: Middle leg: Femur : tibia : tarsus : claws : : 100 : 45.1 : 31.7 : .34.7. Hind leg : Femur : tibia : tarsus 1 : tarsus 2 :: 100 : 100.9 : 111.8 : 60. The hind femora armed with very few isolated spines, both on the upper and lower side. Abdominal asymmetry of the male sinistral. The strigil with about 7 combs, situated on a short pedicle and rather remotely from the lateral margin of the tergite. The genital capsule as shown on Plate LXV. Location of types: In the British Museum. Six specimens taken near Guatemala City. These have been examined by Hungerford and by Jaczewski. Comparative notes: The sinistral males separate this species from the other species that have the same shape and general facies. Data on distribution : (Plate XC. ) Described from Guatemala by Champion. Reported by Jaczewski from Colima, Mexico, Aug. 20, 1929, 1 male, 2 females from "a large temporary pool on a country road, no aquatic plants." We have in the University of Kansas collection the following from Mexico: State of Mexico, Lerma, May 15, 1930, Creaser and Gordon, 1 female; State of Mexico, Te- jupilco, Dist. of Temascultepec, Alt. 1,340 meters, June-July, 1933, H. E. Hinton, 2 males, 13 females; same place June 22, 1933, R. L. Usinger, 1 male; Rio Amacuza, Morelos, Kil. 133 S. Mexico City, October 14, 1936, H. D. Thomas, 15 males, 24 females. Pseudocorixa beameri (Hungerford) (Plate LXV, 2 figs.; Plate LXVI, 1 fig.) 1928. Arctocoriia beameri Hungerford, H. B. Annals Ent. Soc. America, XXI, p. 142, PI. IX, figs. 7 and 9. 1933. Sigara beaineri, Jaczewski, T. Annales Musei Zooiogici Polonici. Tom. IX, Nr. 21, p. 335. 1938. Arctocorixa beameri, Hungerford, H. B. Pan-Pacific Entomologist XIV, p. 7(1. (Reports it from Mexico.) 1939. Sigara beameri, Huiigerfurd, H. B. .11. Kansas Ent. Soc, XII, p. 123, fig. p. 12.5. Size: Length 5.25 mm. to 6 mm.; width across the head 1.9 mm. to 2.24 mm. Males usually a little smaller than the females. Color: General facies dark brown, the pale lineations not con- spicuous. About seven pale bands on pronotum, those of hemelytra more or less effaced, the lighter figures very broad, yet so dark that the general effect is dark. Embolar groove brown. Venter dark brown to black. 412 The University Science Bulletin Structural characteristics: Head, viewed from above, about half as long as the pronotal disk. Interocular space slightly greater than eye width in female. Rear margin of head roundly produced. Pro- notum short, the disk not quite half as long as broad, the rear mar- gin broadly rounded. Surface of pronotum and base of hemelytra somewhat rastrate and entire dorsal surface pebbled except the mem- brane which is smooth and hyaline. Legs short and stout. The front leg of the male as shown in Plate LXVI. The tibia expanded into a plate above that is tipped by a spine ; a strong comb of bristles at the distal base; the pala thin, a row of about 14 pegs above the middle of the inner face, the distal pegs longer. Another row of 3 or 4 pegs ending the basal row of upper palmar bristles. Beyond this interruption and at a higher level is a row of about 9 stout spines. The tip of the middle tarsus not much surpassing the tip of the abdomen. The comparative lengths of the leg segments as follows: Middle leg — femur : tibia : tarsus : claws : : 100 : 48.3 : 34.5 : 41.4. Hind leg— femur : tibia : tarsus 1 : tarsus 2 : : 100 : 100 : 106 : 50. Hind femora with eight or more stout spines beneath. Metaxyphus long and slender. Odoriferous gland pores, prominent and guarded by several strong spines. Some of these may be matted together to form a very broad, flat plate that tapers from a broad base to a pointed tip. The male dextral, the strigil is small, round, sessile, of five longitudinal combs, the outer and inner one, of course, very short. The genital capsule of the male as shown on Plate LXV. Comparative notes: The similarity of this species to Champion's guatenialensis in general facies, form and palar characters was not noticed at the time it was described. Jaczewski says his S. ocot- lanensis is a near relative. Location of types: Described from five specimens (3 males and 2 females) taken by Doctor R. H. Beamer, Cochise County, Arizona, July 29, 1927. Holotype, allotype and paratype in the Francis Huntington Snow Entomological Collections of the University of Kansas. Data on distribution : (Plate XC.) To date, the only United States record is that of the types taken in Arizona. We have the following from Mexico: Juan Manual, near El Salto, 9,300 ft. above sea level in Pine Forest region, June 5, 1937, Meldon Embury, 10 males, 17 females (State of Durango) ; Michoacdn, Morelia, September 4, 1938, H. D. Thomas, 1 male, 5 females; Michoacdn, Patzcuaro, August 31, ^\ESTERX Hemisphere Corixidae 413, 1938, H. D. Thomas, 1 male, 1 female; Jalisco, Tecolotlan, Septem- ber 15, 1938, H. D. Thomas, 2 females. Pseudocorlxa beanieroidea (Hungerford) (Plate LXVI, 3 figs.) 1939. Sigara beanieroidea Hungerford, H. B. Jl. Kansas Ent. Soc. XII, pp. 123-12-1, 3 figs. p. 125. Size: Length 5.25 mm. to 5.88.; width across the head 1.89 mm. to 2 mm. A fairly short, compact species. Color: General facies as in P. beameri (Hungerford), the pale lineations not conspicuous. About eight pale bands on pronotum, those on hemelytra more or less effaced, the lighter figures broad, yet so dark that the general effect is dark. Structural characteristics: Head broad and short, that of male slightly longer than that of female as seen from above and more than half the length of the pronotal disk. Interocular space slightly greater than eye width in female. Face of male broadly depressed. Pronotal disk a little longer than half its width, its rear margin broadly rounded. Pronotum, clavus and basal half of corium ras- trate. Legs short and stout. The front leg of male as shown on Plate LXVI. The tibia expanded into a plate that is tipped by a spine, but since this plate is directed forward instead of dorsally, it does not show its real width in the illustration; a comb of bristles at the distal base, the pala tliin, a row of about 18 pegs on the middle of the inner face, the short basal ones making a hook, the distal ones elongate. Another row of six pegs in line with the basal half of the upper palmar row of bristles which continues just below and ter- minates with the peg row; after an interruption there is a row of about eight stout spines. About half the middle, tarsus extending beyond the abdomen. The comparative lengths of the leg segments as follows: Middle leg: Femur : tibia : tarsus : claws : : 100 : 50 : 32.5 : 39. Hind leg: Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 100 : 113 : 49.3. The spines on hind femora less conspicuous than in P. beameri. Metaxyphus long and slender. Odoriferous gland pores guarded by some strong spine-like hairs. The male abdomen dex- tral, the stnigil wider than long, of six or eight combs and hidden beneath a layer of stiff bristles projecting from the rear margin of the fifth segment. The seventh tergite with a large semicircular lobe. The genital capsule as shown on Plate LXVI. Comparative notes: This species must be very near P. ocotlanen- 414 The University Science Bulletin sis (Jaczewski ) , from which it differs in characters that cannot be ignored. The shape of the seventh abdominal tergite cannot be reconciled with the drawing given by Dr. Jaczewski of his species. The strigil, while guarded by hairs projecting from a lobe of the fifth tergite, consists of six or eight combs instead of four as in P. ocotlanensis (Jaczewski), and the right clasper has a characteristic bend on its concave margin not seen in Dr. Jaczewski's species. It also lacks the small denticulations on its inner margin just before the blunt apex described from Dr. Jaczewski's species. In none of the seventeen specimens is there any clear indication of a pale, oblique stripe on the membranal suture. In all of my specimens the left membrane is hyaline, the right one more pigmented. Location of types: Described from seven males and seven females taken twelve miles west of Villa Victoria, State of Mexico, March 23, 1939. We also have three males from Puebla, Puebla, Mexico, taken by Henry Thomas, August 16, 1937. Holotype, allotype and paratypes in Francis Huntington Snow Entomological Museum. Data on geographical distribution: (Plate XC.) In addition to the type series, we have before us the following: Mexico: Mich- oacdn, Zacapii, September 1, 1938, Thomas and Lipovsky, 3 males, 1 female; Michoacdn, Carapa, September 2, 1938, H. D. Thomas, 1 female; Jalisco, Guadalajara, September 13, 1938, H. D. Thomas, 2 males, 8 females. Pseudocorixa conata (Hungerford) (Plate LXVI, 3 figs.) 1939. Sigara covata Hungerfonl, H. B. .11. Kansas Ent. Soc, Vol. Xll. No. 4, p. 124; pl-p. 125, figs. 1, 2, and 6. Size: Length 5.5 mm., width across the head 1.99 mm. A fairly short, compact species. Color: General facies much as in P. beaineri (Hungerford), the pale lineations not conspicuous. Eight or nine pale bands on pro- notum, those of hemelytra more or less effaced, the lighter figures broad, yet so dark that the general effect is dark. Embolar groove brown to black. Venter, including the coxae, black in the two males before me. Structural characteristics: Head broad and short as seen from above, about half as long as the pronotal disk. Face of male only moderately flattened, not depressed. Front margin of vertex broadly rounded as seen from above. Pronotal disk slightly longer than one-half its width. A short keel on anterior median line Western Hemisphere Corixidae 415 visible on one of the males. Caudo-lateral angle of disk not pointed. The front leg of the male as shown on Plate LXVI. A stridular field of pegs on the femur; the tibia conically produced and termi- nated by a spine — a strong comb of bristles at the distal base; the pala thin — a sigmoid row of about 16 pegs on the middle of the inner face, the distal pegs longer. Above this row a patch of thin short bristles. Another row of 8 pegs just above the upper palmar row of bristles which terminates with the distal end of the peg row; distally is an oblique row of about 9 stout spines. The middle legs relatively longer than in P. beameroidea, the tip of the tibia reach- ing the end of the abdomen. The relative length of the leg seg- ments as follows: Middle leg: Femur : tibia : tarsus : claws : : 100 : 48.4 : 35. 5 : 43.44. Hind leg: Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 107.2 : 112.5 : 62.5. The middle femur with a thick patch of straw colored hairs on the distal third of the rear margin. These are matted down in the two specimens at hand and give the femur the appear- ance of being enlarged on its outer third. Metaxyphus long and slender. Odoriferous gland pores prominent and guarded by hairs. The male dextral with a small strigil of three combs on the right side of the distal end of a long pedicle. The genital capsule as shown on Plate LXVI. Comparative notes: This easily identified species is somewhat uncertain in its relationships. The strigil is located at the end of an elongation of the sixth abdominal tergite. Morphocorixa lund- bladi Jacz. and Morphocorixa compacta (Hungerford) have a, simi- lar prolongation but no strigil. The pala is unique, while the cone- shaped expansion of the front tibia may be an extreme expression of a much less noticeable expansion of the tibia in P. heameri (Hungerford). The right lobe of the eighth abdominal segment is but slightly constricted at its outer base and does not show any indication of the lateral projection of this lobe which is so char- acteristic in Morphocorixa lundbladi Jaczewski. Neosigara colum- biensis Lundblad has a strigil on a pedicle, but its general facies and certain structural characters make it not congeneric with P. conata (Hungerford). Location of types: Described from two males taken twelve miles west of Villa Victoria, State of Mexico, on March 23, 1939. Alt. 2,580 meters. Types in the Francis Huntington Snow Entomological Collections. (See Plate XC.) 416 The University Science Bulletin Pseudocorixa ocotlanensis (Jaczewski) (Plate LXV, 3 figs., drawings after Jaczewski) 1933. Sigara ocotlanensis Jaczewski, T. Aimales Musei Zoologici Polonici, Tom. IX, Nr. 21, pp. 333-335; Tal. XLVI, figs. 9, 10, and 11. Since this species is known only from a mutilated male lacking front and middle legs it is necessary to quote Doctor Jaczewski's description and hope that perfect specimens may someday be recog- nized and that we have placed the species in its proper position. "Mexico, Ocotlan, 1 male (Hungarian National Museum, Buda- pest). "General shape stout and compact. Ground color of pronotal disk and of hemelytra dark brown with a bluish shine, pale pattern very little conspicuous, strongly effaced, general appearance therefore very dark. Head, underside and legs greyish yellow. Eyes blackish brown. "Head, when seen from above, equals in length about % of the length of the pronotal disk. Postocular and subocular space very narrow. Posterior margin of the vertex slightly infuscated. Frontal arch evenly rounded. Facial impression of the male distinct, but moderately developed, almost glabrous. "Pronotal disk a little over twice as wide as long, crossed by about 8 narrow, pale transverse lines, of which the anterior ones are a little wider. Posterior angle broadly rounded, little pronounced. Lateral angles blunt. In front of the disk a very faint indication of a median keel. Lateral lobes of the prothorax almost parallel- sided, rounded at the apex. "Pronotal disk, clavus and base of corium distinctly and strongly rastrated. Remaining portion of corium smooth, a little rugulous. The pale transverse lines of the clavus and of the corium rather irregular, much interrupted, here and there anastomosing, and strongly effaced, almost confluent with the dark ground color. At the base of the clavus the lines arc a little widened interiorly and partly confluent with each other into a paler spot. Outer angle of the corium uniformly pale, the pattern disappearing here altogether. Membranal suture marked by a pale obliciue stripe. Marginal area almost black in its basal portion then gradually paler with a dark spot at the outer basal angle of the membrane. Margins of the latter uniformly smoky with the pattern obliterated. "The front and intermediate legs of this specimen were unfor- tunately broken away and could not be examined. "Fifth abdominal tergite with a prestrigilar tuft of stiff hairs. Western Hemisphere Corixidae 417 Strigil small, transversely oval in shape, with four short combs (Fig. 9). Central lobe of the seventh abdominal tergite strongly developed (Fig. 10). Right paramere with some small denticula- tions on its inner margin just before the blunt apex (Fig. 11). Left paramere strongly tapering towards the end. Inner sheath of the penis anchor-like. Posterior processus of the ninth abdominal seg- ment simple. "Length 5.5 mm. "This species seems to stand closest of all to Arctocorixa beameri Hungfd. from Arizona, from which it differs, however, by the shape of the right paramere and of the strigil. Without an examination of the front legs of the male it is difficult to say whether this species should not be placed (perhaps together with the mentioned species of Hungerford) in some other genus." (See Plate XC for distribution) . 27-822 418 The University Science Bulletin PLATE LXV Pseudocorixa Jaczewski Fig. 1. Pacudocurixa guatemalensis (Champion); pala of male. Fig. la. Genital capsule of male. Fig. lb. Dorsal view of male abdomen. Fig. 2. Pseudocorixa ocoilanensis Jaczewski; dor.sal view of 7th segment of male abdomen and strigil. Jaczewski's figures 9 and 10. Fig. 2a. Right clasper of male.* Jaczewski's figure 11. Fig. 3. Pseudocorixa beameri (Hungerford) ; dorsal view of male abdomen. Fig. 3a. Genital capsule of male. (For pala see Plate LXVI.) * Drawings after Jaczewski. Western Hemisphere Corixidae 419 PLATE LXV P beameri PSEUDOCORIXA JACZ P. beameri (Hungfd) 420 The University Science Bulletin PLATE LXVl Pseiidocorixa Jaczewski Fig. 1. Pseudocorixa conaia (Hungerford) ; pala of male. Fig. la. Genital capsule of male. Fig. lb. Dorsal view of male abdomen. Fig. 2. Pseudocorixa beameri (Hungerford) ; pala of male. Fig. 3. Pseudocorixa beameroidea (Hungerford) ; pala of male. Fig. 3a. Genital capsule of male. Fig. 3b. Dorsal view of male abdomen. Western Hemisphere Corixidae 421 PLATE LXVI P conotc (Hungfd) P beamen V^ungtd) P beameroidea {Hungfd) P conoto P. beameroidea P conota P beameroidea PSEUDOCORIXA jaCZ 422 The University Science Bulletin Morphocorixa Jaczewski 1931. Jaczewski, T. Annates Musei Zoologiei Polonici, Tom. IX, No. 15, p. 197. (New subgenus of Sigara for Arctocorixa compacta Hungerford as subgenotype.) 1935. Poisscn, R. Archives de Zool. Exp. et Gen. LXXVII, pp. 465 and 504. 1936. Poisson, R. Bulletin de la Societe Scientifique de Bretagne, Tom. XIII, Fasc. 1> and 2, p. 6. 1943. Walton, G. A. Trans. Soc. for British Entomology VIII, p. 157 (as subg. of Trichocorixa Kirk.). Rather stout-bodied corixids, relatively broad and compact, with tip of tarsus of middle leg barely reaching tip of abdomen. Head short as seen from above. Postocular and subocular space narrow. Pronotum and clavus rastrated. Corium nearly smooth, semihya- line and often indistinctly separated from membrane. Scattered hairs on hemelytra. Embolar area wide; the pruinose area of the embolar groove posterior to the nodal furrow short (never more than %2 the length of the cubital ridge) and slightly longer than the pruinose area along the claval suture. Lateral lobe of pronotum linguiform, broadly rounded at the apex. The distance between the shining basal apices of the clavus and corium equal to the distance between the basal apex of the corium and the distal end of the pruinose area along the claval suture. Metaxyphus elongate. The anterior tibia with apical comb of spines. Ventral side of basal half of hind femur pubescent. Middle femora not longitudinally grooved on ventral surface. Asymmetry of male dextral, strigil absent but a strigilar pedicle present. The lobes of the eighth abdominal seg- ment unlike, the right one reduced with a lateral projection. Comparative notes: This genus is near some of the species we are assigning to Pseudocorixa. P. conata, for example, has a strigil on the end of a long pedicle but Morphocorixa has only the pedicle. The modified right lobe of the eighth abdominal segment in the male is distinctive for Morphocorixa. Neosigara Lundblad, to which Doctor Lundblad once assigned M. compacta (Hungerford), is not as closely related to Morphocorixa as is Pseudocorixa Jaczewski. Distribution: Southwestern United States and Mexico. Texas and Arizona in the United States and from Chihuahua and Sonora to Colima and Guerrero in Mexico. The two known species seem to be separated by the Sierra Madre Mountains, M. compacta on the east, extending from Texas to the state of Tamaulipas in Mex- ico, and M. lundbladi on the west, from the Santa Rita Mountains in Arizona to Guerrero in Mexico, the Chihuahua record being west of the range. It seems likely that M. compacta will be found in Chihuahua opposite the Big Bend country of Texas, and in Coa- huila, Mexico. Western Hemisphere Corixidae 423 These two species in general facies are alike, but M. compacta has only 7 or 8 brown lines on the pronotum while M. lundbladi has 9. The males are consistantly different in palar characters, in the shape of the right lobe of the eighth abdominal segment and in the genital capsule characters (see Plate LXVII.) The following key will separate the species: key to MORPHOCORIXA LUNDBLAD A. With the meron equal in length to the pruinose area along the claval suture in both sexes M. lundbladi (Jacz.) AA. With the meron shorter than the pruinose area along the claval suture in both sexes M. compacta (Hungfd. ) Morphocorixa compacta (Hungerford) (Plate LXVII, figs. 1, la to Id. Wash drawing No. 8, Plate IV) 1925. Arctocorixa compacta Hungerford, H. B. Bull. Brooklyn Ento. Soc, XX, p. 22, PI. II, figs. 2-5. (Desc. from Eastland Co., Tex.) 1928. Neosigara compacta, Lundblad, O. Entomologisk Tidskrift, XLVIII, Haft 4, p. 227. 1931. Sigara (.Morphocorixa) compacta. Jaczewski, T. Annales Musei Zoologici Polonici, Tom. IX, Nr. 15, p. 197, pi. XXVI, figs. 13, 15, 18. 1939. Arctocorixa compacta. Millspaugh, Dick D. Field and Laboratory, VII, No. 2, p. 85. Size: Length 5.9 mm. to 7 mm.; width of head from 1.96 mm. to 2.38 mm. Males slightly smaller than the females. Shape: Very compact, relatively broad species. Color: Pattern as a whole rather indistinct. The markings on the hemelytra often faint. The pronotum crossed by 7 or 8 dark brown bands which are sometimes somewhat broken, the yellow bands usually slightly wider than the brown. On the hemelytra the pale bands twice as broad as the dark ones, both of which are fre- quently nearly obliterated, leaving an almost hyaline corium. Head, legs and venter yellow, the latter sometimes dark. Structural characteristics: Head very short and broad as seen from above. Frontal depression scarcely discernible in the male. Pronotum and clavus rastrate. Corium shiny. Pruinose area along the claval suture longer than the meron in both sexes. Front femur not much thickened at base. Pala as shown on Plate LXVII, figure 1. The distal pegs of the row elongate; a few pegs in the upper palmar row of bristles. The strigilar pedicle rather long and flat without a strigil; the right lobe of the eighth abdominal segment with a broad projection that is broadly folded as seen in lateral view. The posterior process of the genital capsule with a large sclerotized flap. (See Plate LXVII for details.) 424 The University Science Bulletin Comparative notes: The comparatively broad compact appear- ance witli iti* often semihy aline hemelytra distinguishes this species. In addition it may be separated from the following species by the fact that the meron is shorter than the pruinose area along the claval suture. Location of types: Described from 255 specimens from Eastland County, Texas, taken in May, 1921, by Mrs. Grace Olive Wiley. Holotype, allotype and many paratypes in the Francis Huntington Snow Collections of the University of Kansas. Paratypes were sent to Mrs. Wiley, Mr. J. R. de la Torre-Bueno, Mr. William E. Hoff- mann, Doctor H. M. Parshley, Doctor R. F. Hussey and the United States National Museum. Data on distribution: (Plate LXVUI.) This species was described from a long series of specimens taken by Mrs. Grace Wiley in East- land County, Texas. Other records before us are: U. S. A. Texas: Randall County, July 7, 1927. R. H. Beamer, 1 female; Menard County, July 19, 1928, R. H. Beamer, 2 males, 1 female; Kerr County, July 21, 1928, L. D. Beamer, 1 female; Kerr County, April 9, 1939, D. Millspaugh, 1 male, 3 females; Kendall County, July 22, 1928, R. H. Beamer, 3 males, 2 females; Hays County, San Marcos, Charles Burt, 2 males; Jim Wells County, July 24, 1928, R. H. Beamer, 3 males, 1 female; Jim Wells County, July 24, 1928, A. M. James, 1 male, 1 female; Jim Wells County, Alice, Jan. 21, 1946, L. D. Beamer, 20 males, 12 females; Alfred, July 24, 1928, R. H. Beamer. 7 males, 9 females; Falfurrias, Jan. 1, 1946, L. D. Beamer, 18 males, 39 females; Cameron County, Aug. 13, 1928, A. M. James, 2 females; Hidalgo County, November 22, 1932, L. D. Tuthill, 2 males, 3 females; Hidalgo County, Mc- Allen, November 20, 1932, L. D. Tuthill, 1 male (sinistral), 2 fe- males; McAllen, Dec. 30, 1945, L. D. Beamer, 1 male, 2 females; Starr County, July 5, 1938, R. I. Sailer, 2 males, 4 females; San Marcos, Charles Burt, 25 males, 36 females; Sutton County, July 20, 1928, J. G. Shaw, 9 males, 7 females; Val Verde County, Langtry, July 9, 1938, D. W. Craik, 2 males, 4 females; Val terde County, Del Rio, July 8, 1938, D. W. Craik, 1 male; Val Verde County, Del Rio, 1937, H. D. Thomas, 1 male; Terrell County, Sanderson, July 9. 1938, D. W'. Craik, 2 males, 3 females; Brewster County, Alpine, February, 1927, G. P. Engclhardt, 1 female; Jeff Davis County, Valentine, July 13, 1927, R. H. Beamer, 2 males, 1 female; Victoria, Dec. 27, 1910, J. D. Mitchell, 8 males, 12 females (U. S. N. M.) ; Brewster County, Glenn Springs, July 29, 1928, F. M. Gaige ^^'ESTER^■ Hemisphere Corixidae 425 (Mich. Coll.), 1 female; Austin, Oct., 1899, C. T. Brues, 1 female; Eastland County, May 23, 1921, Grace Wiley, 2 males. Mexico: Tainmdipas: San Jose, April, 1910, 2 males, 2 females; Vallecillo, nr. Nucvo Laredo, Sept. 1, 1944, H. D. Thomas, 5 males, 2 females. Hidalgo: 18 mi. n. of Aguas Frias, H. D. Thomas, 2 males, 2 fe- males. Morphocorixa lundbladi (Jaczewski) (Plate LXVII, figs. 2, 2a-2c) 1931. Sigara (Morphocorixa) liitidbladi Jaczewski, T. Ann.iles Musei Zoologici Polonici, Tom. IX, Nr. 15, pp. 197-201, PI. XXVI, figs. 12, U, 16, 17, 19, 20; PI. XXIX, fig. 61, (Desc. from Colima, Mexico). Size: Length 5.85 mm. to 7.5 mm.'" Width of head 2.24 mm. to 2.31 mm. The males slightly smaller than the females. Very com- pact, relatively broad species. Color: Pattern as in M. compacta except that the pronotum is crossed by 9 brown bands instead of 7 or 8. The head, legs and venter yellow except that the abdominal venter of male is usually dark and the females have a dark band along the margin. Structural characteristics: Head short and broad as seen from above. Frontal depression scarcely discernible in the male. Fourth antennal segment 58.1 percent of the third. Pronotum and clavus rastrate, corium smooth. Pruinose area along the claval suture equal in length to the meron. Front femora not much thickened at the base. Jaczewski gives the relative lengths of the various parts of the middle and hind legs as follows: For the middle leg: Femur : tibia : tarsus : claw : : 100 : 48.2 : 30 : 42.7. For the hind leg: Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 96.9 : 107.8 : 51.6. Male pala as shown on Plate LXVII, figure 2. No pegs in the upper palmar row of bristles. The strigilar pedicle long, slender and broaded at tip, without a strigil. The right lobe of the eighth abdominal segment with a slender projection that is narrowly folded as seen in lateral view. The posterior processus of the genital capsule as shown in figures 2a and 2b on Plate LXVII. Location of types: Jaczewski described this species from 1 male and 2 females taken at Colima, Mexico, August 20, 1929. The types are doubtless at the Polish Museum in Warsaw. Comparative notes: Both sexes may be distinguished from M. compacta (Hungerford) as already indicated in the key. In addi- * Jaczewski gives 7.5 mm. as the length of his species. We have 23 specimens, but none attains even 7 mm. 426 The University Science Bulletin tion, the males show differences in the palae, the strigilar pedicle, the right lobe of the eighth abdominal segment, the right clasper, and the posterior process of the genital capsule (ninth segment). (See Plate LXVII.) Data on distribution: (See Plate LXVIII.) The type series, 1 male and 2 females, were taken at Colima, Mexico, "about 450 meters above sea level in a large temporary pool on a country road, no aquatic plants." With it were taken Pseudocorixa guatemalensis (Champ.) and Centrocorisa kollarii (Fieb.). We have in the Uni- versity of Kansas collection the following: Mexico: Guerrero: Iguala, October 7, 1936, H. D. Thomas, 1 male, 3 females; Rio Balsas, Kim. 259, S. Mexico City, October 31, 1936, H. D. Thomas, 1 male. Jalisco: Tecolotlan, September 17, 1938, H. D. Thomas, 1 male. Sonora: Salitial Rio Mayo, February 23, 1935, H. S. Gentry, 3 females; Tepopa S. Charibo, March 9, 1935, H. S. Gentry, 5 males, 5 females; Conejos Dist. Alamos, October 26, 1934, H. S. Gentry, 1 female. Chihuahua: San Luis Babarocos, December 30, 1934, H. S. Gen- try, 2 males. U. S. A.: Arizona: Santa Rita Mountains, June 12, 1933, R. H. Beamer, 1 male. PLATE LXVII Morphocorixa Jaczewski Fig. 1. Morphocorixa compacta (Hungerford) ; front leg of male. Fig. la. Left view of tip of 9th segment of male adbomen (genital capsule). Fig. lb. Ventral view of tip of 9th segment of male abdomen (genital cap- sule) . F^g. Ic. Genital capsule of male. Fig. Id. Dorsal view of male abdomen. Fig. 2. Morphocorixa lundbladi (Jaczewski) ; front leg of male. Fig. 2a. Genital capsule of male. Fig. 2b. Ventral view of tip of 9th segment of male abdomen (genital cap- sule). Fig. 2c. Dorsal view of male abdomen. Western Hemisphere Corixidae 427 PLATE LXVII 2. M. lundbladi Jacz. MORPHOCORIXA JACZ 428 The University Science Bulletin PLATE LXVUI »\ so. ft A fr 50 IDO 200 300 SiZ io ff- .^ ''\° .:.'a y\a 1 ▲ M LUNDBLADI p 100 ;00 ■1Q0 jQO Western Hemisphere Corixidae 429 Neosigara Lundblad 1928. Lundblad, O. Entomologisk Tidskrift, XLVIII, Hiift 4, p. 222 (new genus with genotype columbiensis). 1931. Jaczewski, T. Annales Musei Zoologici Polonici IX, Nr. lo, p. 197 (compares his Sigara (Morphocorixa) with Neosigara Lundb.). 193.5. Poisson, R. Arch, de Zool. Exp. et Gen., LXXVII, p. 458 (Neotropical). 1943. Walton, G. A. Trans. Soc. for British Entomology, VIII, Pt. o, p. 158 (proposes Neosigara as subg. of Corixal). These corixi(^s are rather l)road and compact and moderately ras- trate but shining. The pruinose area on the corial side of claval suture long. The interocuhir space is broader than an eye. Lateral lobe of prothorax elongate, obliquely truncate, the anterior distal angle produced. Metaxyphus long and bluntly rounded at tip. Male pala with two rows of pegs, the lower one near margin of palm interrupted and of elongate pegs. Genotype N. columbiensis Lund- blad. Doctor Lundblad proposed this genus for his new species N. co- lumbiensis and gave in his generic diagnosis the statement that the males are dextral and strigil present. I am convinced, however, that C. griffinii Kirk, is congeneric with A^. columbiensis although the males are sinistral, for the most part, and lack a strigil. KEY TO NEOSIGARA LUNDBLAD 1. Males normally with sinistral asymmetry, strigil lacking (see text fig. 5). A'^. griffi.nii (Kirk.) (^ C williamsi Hungfd.) (see p. 429) Males with dextral asymmetry, strigil present 2 2. (1) Distal margin of ventral pubescent area of the hind femur deeply incised; dorsal view of male abdomen as on Plate LXIX, fig. 2b .V. colui}ibiensis Lundb. (see p. 432) Distal margin of ventral pubescent area of the hind femur smoothly curved ; dorsal view of male abdomen as on Plate LXIX, fig. lb. . .A'^. murilloi n. up. (see p. 433) Neosigara griffinii iKirkaldy) (Text fig. 5; wash drawing No. 33, Plate VI) 1899. Corixa iCallicorixa) griffinii Kirkaldy, G. W. Bollettino Musei di Zoologia ed Anatoniia Comparata (Turino), XIV, N. 350, pp. 7-8, fig. 6-7 (desc. from Ecuador). 1909. Callicoriia griffinii. Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wa3hington, X, p. 193. 1928. Corixa williamsi Hungerford, H. B. Bull. Brooklyn Ent. Soc, XXIII, p. 175, PI. VII, figs. 11, 12 and 13 (desc. from Ecuador and records reversed asymmetry of male). 1931. Corixa williamsi, Jaczewski. T. Annale.s Mus. Zool. Polonici, IX, No. 15, p. 208. 1933. Sigara. griffinii, Jaczewski, T. Ann. Mus. Zool. Pol., IX, No. 21, pp. 335-336, PL XLVI, figs. 2, 12 {Corixa williamsi Hungerford is a syn.). 1939. Sigara griffinii. Hungerford, H. B. Jl. Kans. Ent. Sue, XII, Nc. 2, p. 72 (of 751 males only 6 dextral). Size: Length 5.4 mm. to 6.3 mm.* Width across eyes 1.8 mm. to 2.2 mm. * Kirkaldy gives 6.5-7 mm. but the female type.s studied by me are not so large. 430 Thk University Science Bulletin Color: General facies medium brown. Pronotum crossed by 8 to 9 broken, irregular dark bands, distal ones tending to coalesce along latero-distal margins. Clavus with dark pattern obscure or lacking on inner basal angles; rest of clavus and corium banded with more or less irregular, transverse dark bands. Pale line separating corium from membrane which is also cross-banded, with apical margin dark. Embolium, head, limbs, and thorax pale; ab- domen pale throughout in females, smoky at base in males. Structural characteristics: Head about four times as broad as long; interocular space greater than the width of an eye; vertex pro- duced in both sexes as seen from above ; face not hairy ; male fovea poorly defined, shallow and narrow; antennal segmentation: 1:2: 3 : 4 : : 22 : 18 : 30 : 25 ^ ; 1 : 2 : 3 : 4 : : 22 : 18 : 32 : 25 $ . Pronotal disk without a median carina, lateral margins angulate, distal margin rounded; pronotum and hemelytra moderately ras- trate, the latter without hairs; pruinose area of embolar groove posterior to nodal furrow longer than that of the claval suture. Lateral lobe of the prothorax elongate, slender, apex obliquely truncate; mesoepimeron narrow with osteole near the tip; metaxy- phus longer than broad, apex blunt. Front leg of female of us;ial shape. Front leg of male: pala with dorsal margin curved from base to apex as seen in lateral view, about 21 pegs in curving row, those in middle of row stouter; upper palmar row of stout bristles with a gap beyond the middle, basal spines slender, apical ones stouter; long hairs in palm between bristle row and the lower pal- mar row of bristles; tibia two-thirds as long as pala with short carina and a small pad; femur slender without stridulatory pegs at base. Middle and hind legs slender; hind femur with two rows of short spines on ventral surface near apex and midway between mar- gins; the proportions of segments as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 45.6 : 36.7 : 43.3. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 99.9 : 136.6 : 37.2. Male asymmetry sinistral; strigil lacking. Some specimens show a small projection or stalk at the place on the sixth abdominal segment where a strigil would normally occur. This is probably the vestigial remains of a strigil-bearing stalk such as is found in the other two species of this gsnus. Left clasper of male genital capsule broad and blunt. For details of male structures see text fig. 5. Female abdomen normal. Western Hemisphere Corixidae 431 Comparative notes: The absence of a strigil and other male char- acters serves to separate this species from A^. columhiensis Lundb. and N. murilloi n. sp. Location of types: Types of Sigara griffinii (Kirkaldy) in Turin Museum (Italy) ; two females labeled "cotype," and the types of Corixa williarnsi Hungerford in the Francis Huntington Snow Ento- mological Collections, University of Kansas. Data on distribution: (Plate XXXV.) Ecuador: Baiios, Tun- guragua Lake, Jan. 1, 1923, F. X. Williams, 4 males (1 reversed), 5 females; Baiios Lake, March, 1936, Clark Maclntyre, 408 males (2 reversed), 363 females; Panti Cocha, April, 1936, C. Maclntyre, 111 males (2 reversed), 103 females; Runtun Lake, Baiios, June, 1936, C. Maclntyre, 93 males (2 reversed), 83 females. Peru: Dept. of Cajamarca, Andes 2,625 m. above sea level, vie. Celendin, May-June, 1936, F. Woytkowski, 7 males (2 reversed), 5 females; Dept. of Amazonas, San Idelfonso, 4,000 m. above sea level, cold ponds, July 29, 1936, F. Woytkowski, 2 males (1 reversed), 1 female. The two female co-types notes above are labeled ''Lago di Kingora, Mus. Turin, det. 1899, Kirkaldy." Fig. 5. Neosigara griffinii (Kirk.); (a) genital capsule of male; (6) front leg of male; (c) dorsal view of male abdomen. 432 The University Science Bulletin Neosigara columbiensis Lundblad (Plate LXIX, figs. 2, 2a-2c; Plate VI, fig. 34) 1928. Neosigara columbiensis Lundblad, O. Ent. Tidskrift, XLVIII, Haft 4, pp. 222- 227, text figs. 5-&, PI. IV, fig. 1. 1935. Neosigara columbiensis, Poisson, R. Arch, de Zool. Exp. et Gen., LXXVII, p. 458. Size: Length 5.7 mm. to 5.9 mm. (males). Width across eyes 1.9 mm. (males). General appearance rather short and stout. Color: General facies pale to medium brown. Pronotum crossed by about 8 to 11 dark bands of which the posterior three or four are irregular and much broken. Clavus with oblique dark bands which are narrower on the inner basal portion and thicker distally. Corial pattern vermiculate, the brown coloration sometimes fine and some- times coarser, pattern extending to wing margin across end of em- bolar groove. Membrane not plainly separated from corium though a palish line may be present in some specimens. Embolium, head, limbs and venter pale. Structural characteristics: Head about two-thirds as long as the pronotal disk; interocular space greater than the width of an eye as measured by projection; vertex roundly produced; male fovea deep and broad, not quite attaining the eyes laterally; face of male rather hairy; antennal segmentation: 1 : 2 : 3 : 4 : : 20 : 20 : 40 : 20 male. Pronotal disk about half as long as broad, lateral margins almost truncate; median carina faintly visible on anterior third; apex of disk angulate; pronotum and hemelytra moderately rastrate, the latter with scattered pale hairs. Pruinose area along the claval suture a little shorter than the post-nodal pruinose area. Lateral lobe of prothorax elongate with anterior apical angle produced and posterior one rounded. Mesoepimeron narrow with osteole near the tip; metaxyphus longer than broad, pointed. Front leg of male: Femur slender with a pilose area covering about two-thirds of inner surface on basal portion and followed by a patch of short, stout spines; tibia slender with little indication of a dorsal carina and no pad; pala short and broad, dorsal margin rounded, distal margin obliquely slanted from dorsal margin to insertion point of claw, peg row following dorsal margin and consisting of about 22 pegs of which those in center of row are larger than those at either end; distal ones rather long and slender; upper palmar row with bristles on basal half, and pegs the rest of way in two groups of 4 to 6 pegs each, with a space between the two groups. Middle and hind legs slender ; ventral pubescent area of the hind femur as shown on Plate LXIX, fig. 2c, a group of short spines on the glabrous portion as Western Hemisphere Corixidae 433 shown in same figure. Comparative measurements of segments: Middle leg: Femur : tibia : tarsus : claw : : 100 : 46.2 : 35.4 : 46.2. Hind leg: Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 91.8 : 121.5 : 50.6. Male pala, genital capsule, and abdomen as shown on Plate LXIX, figs. 2, 2a and 2b. Median lobe of the seventh abdominal segment bilobate. Strigil small, of 3 regular combs, located at end of a stalk which curves toward the right. Comparative notes: Males of this species may be distinguished from the following species by the shape of the ventral pubescent area of the hind femur, and by the shape of the median lobe of the seventh abdominal segment. Location of types: Berlin Museum (type from Colombia). Data on distribution: (Plate XXXV.) We have seen the follow- ing: Colombia: Bogota?, Lett., Sept. 6, 1936, L. M. Munllo (U. S. N. M.), 5 males; Bogota, 3 males, 2 females (Bueno Coll.). Neosigara murilloi n. sp. (Plate LXIX, figs. 1, la, lb, Ic) Size: Length 5.9 mm. to 6.3 mm. Width across eyes 1.9 mm. to 2.1 mm. General shape short and rather stout. Color: General facies medium to dark brown. Color pattern almost identical with that of the foregoing species. Base of em- bolium smoky to black in males, pale in females; head and limbs pale; abdomen smoky to black in males except along margins, pale in females. Structural characteristics : Head about two-thirds as long as the pronotal disk; interocular space equaling the width of an eye in males, exceeding the width of an eye in females; vertex rounded; frontal depression of male shallow, narrow and rather sparsely haired; antennal segmentation: 1 : 2 : 3 : 4 : : 18 : 18 : 38 : 20 ^J ; 1 : 2 : 3 : 4 : : 20 : 20 : 40 : 20 $ . Pronotal disk half as long as broad, lateral margins almost truncate, median carina only faintly visible on anterior margin of disk ; pronotum and hemelytra moder- ately rastrate, the latter with scattered pale hairs. Pruinose area along claval suture a little shorter than the post-nodal j^ruinose area. Lateral lobe of the prothorax elongate, apex bluntly rounded; mesoepimeron narrow with osteole near the tip; metaxyphus longer than broad, apex pointed. Front leg of female of usual shape. Front leg of male: femur 28—822 434 The University Science Bulletin slender with a pilose area on inner surface, covering basal two-thirds, and followed by a small group of short, stout spines; tibia slender without a dorsal carina and with a small pad; pala as on Plate LXIX, fig. 1. Middle and hind legs slender; ventral pubescent area of hind femur as shown on Plate LXIX, fig. Ic; short spines on glabrous area as shown in same figure. Comparative measurements of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 44.7 : 32.8 : 44.7. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 94.4 : 115.8 : 51.5. Male pala, genital capsule, and abdomen as shown on Plate LXIX, figs. 1, la, and lb. Strigil of moderate size, of 4 regular combs, located at end of caudally-directed flap. Median lobe of seventh abdominal segment with caudal margin irregular in shape (see fig. lb). Co7nparative notes: This species, though structurally and in gen- eral appearance quite close to N. columbiensis Lundb., may be separated from it chiefly by the shape of the median lobe of the seventh abdominal segment of the male and by the shape of the ventral pubescent area of the hind femur in the same sex. Location of types: Holotype male, allotype female, and 1 male paratype, labeled "Bogota?, Colombia, Lett., Sept. 6, 1936, F. M. Murillo," in the U. S. National Museum; 2 males and 1 female para- types, with the same label, in the Francis Huntington Snow Ento- mological Collections, LTniversity of Kansas. Data on distribution: (Plate XXXV.) Known to us only by the type series. PLATE LXIX Neosigara Lundblad Fig. 1. Neosigara murilloi n. sp.; front leg of male. Fig. la. Genital capsule of male. Fig. lb. Dorsal view of male abdomen. Fig. Ic. Ventral view of hind femur of male. Fig. 2. Neosigara columbiensis Lundblad; front leg of male. Fig. 2a. Genital capsule of male. Fig. 2b. Dorsal view of male abdomen. Fig. 2c. Ventral view of hind femur of male. Western Hemisphere Corixidae 435 PLATE LXIX 436 The University Science Bulletin Centrocorisa Lundblad 1928. Lundblad, O. Entomologisk Tidskiift, XLIX, Heft 2, p. 68. (In footnote pro- poses new generic name for C. kollari Fieb.) 1929. Lundblad, O. Archiv. fiir Hydrobiologie. XX, pp. 311-312. (Describes genus.) 1929. Lundblad, O. Entomologiske Meddelelser, XVI, pp. 277-280. 1935. Poisson, R. Archives de Zoologie Experimental et Generale, p. 458. (Only men- tions as Neotropical.) 1943. Walton, G. A. Trans. Soc. for British Entomology VIII, p. 157. (As subgenus of Trichocorixa Kirk.) Head with interocular space broader than the width of an eye. Body more than one-third as broad as long; legs short and stout. Pronotum with transverse brown Ijars, often interrupted. Heme- lytral pattern reticulate. Surface of hcmelytra moderately hairy. Corium nonrastrate, even at base. Pruinose area beyond the nodal furrow short; postnodal pruinose area, measured from the cubital angle, shorter than or barely equal to, the meron. Pruinose area along the claval suture short. The prothoracic lateral lobe lingui- form, longer than broad, rounded on distal end, narrower in males than in females. Mesoepimeron moderately narrow. Metaxyphlis elongate, large. Males characterized by dextral abdominal asym- metry, absence of a strigil, flattened, triangular prolongation of anterior tibia, and by a pala bearing two rows of pegs, the lower row interrupted with distal pegs setiform. Genotype: Centrocorisa nigripennis (Fabr.). Concerning the genus Centrocorisa Lundblad During the summer of 1940 I made a revisional study of this genus. It contains two forms which I consider good species because we can distinguish both sexes readily. The names must be reviewed ! Fabricius, in his "Systema Rhyngotorum," 1803, described Sigara nigripennis from Insular America. I have seen the two female types in Copenhagen. They belong to the genus Centrocorisa Lundblad. Fieber, in "Species Generis Corisa," 1851, described Corisa kol- larii and wrote "Habitat in Brasilia (Mus. Vienn) Insula Cuba (Mus. Berol)." I have seen these specimens. Those in Vienna are labeled "Natterer Brasilien." They are the same as those described by Lundblad as Centrocorisa kollarii (Fieb.) var. dispar n. var. Now we have the problem of names. There is no question about the name Centrocorisa nigripennis (Fabr.) for there is but one spe- cies of the genus in Insular America. I have specimens from Grenada and Barbados in the Windward Islands, from Antigua in the Lee- ward Islands, from Anegada in the Virgin Islands, from six localities in Puerto Rico, from Haiti, from thirteen collections in Jamaica, Western Hemi.sphere Corixidae 437 and from thirteen collections in Cuba. In this species the left clasper of the male is enlarged at the tip as figured by Doctor Lund- blad [Entomologiske Meddelelser, Bd. XVI, p. 278, Fig. 1 of a speci- men from the island of St. Croix, under the name Centrocorisa koUarii (Fieb.) 1929]. The female does not have the hair patches on clavus and corium which is a distinct feature of Centrocorisa kollarii (Fieb.) var. dispar Lundblad, although Doctor Lundblad appears to have overlooked this character. Thus Centrocorisa kollarii (Fieb.) as determined by Lundblad is Centrocorisa nigri- pennis (Fabr.). Since Fieber had two distinct forms under Centrocorisa kollarii and mentions the one from Brazil first, we should consider his speci- mens labeled "Natterer Brasilien" as types, and I select a male and female as the lectoholotype and lectoallotype. Since these are the same as Centrocorisa kollarii (Fieb.) dispar Lundblad, it is neces- sary to consider Lundblad's form a synonym. I have before me three collections from Brazil, one from Bolivia, one from Ecuador, two from Colombia, two from Paraguay, and five from Peru. All agree in being the same as Centrocorisa kollarii (Fieb.) from Brazil. I consider, therefore, that we have two species of Centrocorisa: Centrocorisa nigripennis (Fabr.) typical of Insular America and Centrocorisa kollarii (Fieb.) typical of South America. In Mexico we have both species, while in Costa Rica and Guate- mala I have seen only Centrocorisa kollarii (Fieb.). In Mexico Centrocorisa kollarii (Fieb.) ranges from Chiapas in the south to Sonora and Chihuahua in the north. Centrocorisa nigripennis (Fabr.) extends from Campeche and Chiapas in the south, up through Hidalgo to Tamaulipas. Both species have been taken at La Libertad, Chiapas, on September 1, 1937, and Januaiy 1, 1938. The two species may be separated as follows: A. Left genital clasper of male broadly expanded at tip. Hemelytron of female with- out hair tufts on corium C. nigripennis (Fabr.) AA. Left genital clasper of male but slightly enlarged at tip. Hemelytron of female with a definite hair tuft or patch on corium near the nodal furrow and a linear strip of longer hairs on clavus near the distal third of the claval suture. C. kollarii (Fieb.) Centrocorisa nigripennis (Fabr.) (Plate LXX, figs. 1, la-lr; wash drawing 13, Plate IV) 1803. Sigara nigripennis Fabricms, J. C Systema Rhyngotorum, Brunsvigae, p. 105. (Types in Universitetets Zoologiske Museum, Copenhagen, from Insular America. Examined by Hungerford, 1928, and Jaczewski, 1939.) 1843. Corisa cubae Guerin-Meneville, F. E. Icoriographie du Regne Animal de B. Cuvier. Part 7, p. 3.53, pi. 57, fig. 9. (Types in Museum National d'Histoire Naturelle, Paris, from Cuba. 4 $ 9. Examined liy Hunserforfl. 1928, und .lac :(\vski.) 438 The University Science Bulletin 1851. Sigara nigripennis Fabr. cited by Fieber in Species Generis Corisa. Prague Sep., p. 40. (Ref. only.) 18.51. Corisa kollarii Fieber, F. X. Species Generis Corisa. Prague Sep., p. 17. (In part : those from Cuba, the types in Zoologisches Museum, Berlin. Examined by Lundblad, 1928, Hungerford, 1928.) 1851. Corixa cubae Guerin cited by Fieber in Species Generis Corisa. Prague Sep., p. 42, with Latin translation of Guerin 's description. 1853. Corixa irrorata Herrick-Schiiffer, G. A. W. Die Wanzenartigen Insecten. Niirn- berg. Vol. IX, pp. 60-61. (Type in Zoologische Sammlung des Bayerischen Staates, Munich, from "Ins. Barthelemy." Examined by Jaczewski. 1939.) 1853. Corixa cubae Guerin, cited by Herrick-Schaffer. Die Wanzenartigen Insecten. Nurnberg. Vol. IX, Heft 81. Alph. Syn. Verz., p. 68. (Ref. only.) 1853. Corisa irrorata Herrick-Schaffer, G. A. W. Die Wanzenartigen Insecten. Niirn- berg. Vol. IX, Heft 8. Alph. Syn. Verz., p. 69. (Ref. only.) 1853. Corisa kollari Fieb. cited by Herrick-Schaffer in Die Wanzenartigen Insecten. Nurnberg. Vol. IX, Heft 8. Alph. Syn. Verz., p. 69. (Ref. only.) 1853. Corisa nigripennis (Fabr.) cited by Herrick-Schaffer in Die Wanzenartigen Insecten. Nurnberg. Vol. IX, Heft 8, Alph. Syn. Verz., p. 70. (Ref. only.) 1857^ Corisa oubae, Sagra, Ramon de la. Historia Fisica, Politica y Natural de la Isla de Cuba. Secunda parte Historia Natural Tom. VII, p. 177. (Brief Latin translation of Guerin 's description and additional notes in Spanish comparing this' with C. kollarii and re- cording specimens from Martinique. (3 5 $ ^'^'^ ^ $ specimens in Museum National d'Histoire Naturelle, Paris, studied by Hungerford, 1928, later examined by Jaczewski, 1933, who called them cotypes. 1859. Corixa nigripennis Fabr. cited by Dohrn in Catalogus Hemipterorum. Stettin, p. 55. (Ref. only— Cuba.) 1859. Corixa cubae Guerin, cited by Dohrn in Catalogus Hemipterorum. Stettin, p. 55. (Ref. only— Cuba.) 1868. Corixa nigripennis, Stal, C. Hemiptera Fabricana in Kongl. Svenska Vetenskaps- Akademiens Handlingar VII, p. 138. (Redescribes specimens from St. Barthelemy, probably Fabrician cotypes in Naturhistorska Riksmuseum, Stockholm. Examined by Hungerford, 1928, Jaczewski, 1939.) 1880. Corisa kollarii, Uhler, P. R. Check List of Heniiptera-Heteroptera of North America. Brooklyn, p. 28. (Ref. only. West Indies.) 1886. Corisa cubae Guerin cited by Uhler in Check List of Hemiptera-Heteroptera of North America. Brooklyn, p. 29. (Ref. only. West Indies.) 1886. Corisa nigripennis Fabr. cited by Uhler in Check List of Hemiptera-Heteroptera of North America. Brooklyn, p. 29. (Ref. only. West Indies.) 1894. Corisa cubae, Uhler, P. R. Proceedings Zoological Society London, p. 224. (From "Island Grenada. His Florida and Texas records I cannot vertify from the Uhler collection.) 1899. Corixa kollarii, Kirkaldy, G. W. Entomologist, London, XXXII, p. 30. (Dist. Jamaica.) 1899. Corixa kollarii, Kirkaldy, G. W. Entomologist, London, XXXII, p. 194. (Dist. Guadaloupe Isl.) 1900. Corixa kollarii, Kirkaldy, G. W. Entomologist, London, XXXIII, p. 72. (Dist. Jamaica at lights.) 1901. Corixa kollari. Champion, G. C. Biologia Centrali-Americana, II, p. 377. (In part: The Grenada, Cuba and Veracruz records.) 1909. Arctocorisa cubae, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Proceedings of the Entomological Society of Washington, X, p. 194. (Ref. only — Cuba.) 1909. Arctocorisa irrorata, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proceedings of the Entomological Society of Washington, X, p. 195. (Ref. only — St. Bar- thelemy.) 1914. Callicorixa kollarii. Barber, H. G. Bull. American Museum of Natural History, N. Y., XXXIII, p. 497. 1917. Callicorixa kollarii, Van Duzee, E. P. Catalogue of Hemiptera of America, North of Mexico. Univ. of Calif. Pub. Ent., Vol. II, pp. 477-478. (Refs. only. Dist. records in error.) 1923. Arctocorisa antitiuensis Torre-Bueno, J. R. de la. University of Iowa Studies in Natural History, X, No. 3, pp. 31-32. (Types in State University of Iowa, Iowa City, ex- amined by Hungerford, 1925 (Jaczewski, ID'S!). Western Hemisphere Corixidae 439 1926. CaUicorixa koUarii, Blatchley, W. S. Heteroptera of Eastern North America. In- dianapolis, Indiana, p. 1066. (Key, description and distribution) (Probably should have been omitted). 1928. Centrocorlsa koUari, Lundblad, O. Entomologisk Tidskrift, XLIX, Haft 2, p. 68. (In part: proposes in footnote new generic name for.) 1929. Centrocorlsa l.ollari, Lundblad, O. Archiv. fiir Hydrobiologie, XX, p. 311. (De- scribes the genus and examined Fieber's types in Zoologisches Museum, Berlin, from Cuba.) 1929. Centrocorlsa kollari, Lundblad, O. Entomologiske Middelelser, XVI, pp. 277-280. Fig. 1 and Palate I. (Desc. specimens from St. Croix.) 1931. CentTocorUa kollari, Jaczewski, T. Annales Musei Zoologici Polonici, IX, No. 10, p. 147. (In which he makes Arctocorisa antiguensis Bueno a synonym.) 1931. Centrocurtsa kollari, Jaczewski, T. Annales Musei Zoologici Polonici, IX, No. 15, p. 196. (In part: the Insular specimens.) 1933. Centrocorlsa cuhae, Jaczewski, T. Annales Musei Zoologici Polonici, IX, No. 21, pp. 336-337. (Studied what he called a "co-type" from Martinique in Paris Museum and says C. antiguensis (Bueno) is a synonym. However, Guerin described species in 1843 from Cuba. Martinique not mentioned until 1857.) 1933. Centrocoi-isa cubae. Jaczewski, T. Annales Musei Zoologici Polonic^, X, No. 1, p. 5. (Records from Martinique, W. I.) 1930. Centrocarisa cubae, Hungerford, H. B. Carnegie Institution of Washington, Publ. No. 457, pp. 145-150. 1939. Centrocorlsa nigripennis, Jaczewski, T. Annales Musei Polonici, XIII, No. 23, pp. 294-298 (In part). 1939. Centrocorlsa nigripennis, Hungerford, H. B. Annals Entomological Society of America, XXXII, p. 588, 1939. CaUicorixa kollarii, Millspaugh, Dick D. Field and Laboratory, VII, No. 2, p. 83. Size: Length 6 mm. to 8.2 mm.; width across the head 2.3 mm. to 2.94 mm. Color: General facies light to medium brown. Pronotum crossed by 8 to 10 brown bands some of which may be broken or incomplete; its rear margin brown. The claviis with the basal transverse brown bands often furcate and narrower than the pale interspaces. The remainder of the clavus, corium and membrane covered with reticu- late figures. That on the corium may be fused into longitudinal series. Embolar area dark to blackish in front of the nodal suture and whitish beyond. Venter yellow except that of male may be somewhat darkened. Structural characteristics: Head of female broad and short as seen from above; vertex broad, less curved than the eyes; the synth- lipsis broader than the eye. The male vertex obtusely angled but less so than in C. kollarii (Fieber). The faciaHmpression not con- spicuously obtusely angled above in the male. Both sexes with some fine white hairs on the front. The fourth antenna! segment about one-half length of the third. No median carina on the pronotum. The pronotum and clavus lightly rastrate, remainder of hemelytra punctate, shining, and covered with short hairs. The female hem- elytron without the hair tufts possessed by C. kollarii (Fieb.). The pruinose area of embolar groove posterior to nodal furrow short in both sexes but shorter in the female. The costal margin of em- 440 The University Science Bulletin bolinm of female not indented but thickened in front of the nodal furrow. ]\Icsoepimeron slender with osteole of scent gland not far from its tip. Metaxyphus long, rather large. Front femur pilose on anterior basal half and broadest beyond the middle. The tibia of the male with a flattened triangular prolongation. The pala of male as shown on Plate LXX. It bears two rows of pegs, the upper one of about 20 pegs, the lower one interrupted, about 12 or 13 i)egs in the basal part and 8 setiform pegs in distal part. Middle and hind legs stout. Hind femur with a definite closely set row of short spines in the dorsal surface above the distal margin and many scattered on the ventral surface. Middle leg: femur : tibia : tarsus : claws :: 100 : 51.5 : 29.9 : 44.8, Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 88.2 : 126.4 : 52.9. Male asymmetry dextral, no strigil. Genital capsule as shown on Plate LXX, fig. la. The tip of the left clasper knob- like. Comparative notes: C. nigripennis may be separated from C. n-ollarii by character's given in the key. Location of types: The Fabrician types are two females in Copenhagen which I have seen. Data on distribution: (Plate LXXH.) Originally described from Insular America. The following published records under various names apply to this species: Grenada, Barbados, Martinique, Guadaloupe, Antigua, St. Croix, Barthelemy, Jamaica, Cuba, and Veracruz, Mexico. I have before me for study specimens from the following places: Grenada: 'Wohurn (South End), H. H. Smith, 1 male. Barbados, W. I.: May 16, 1918, D. Stoner, 1 female. Antigua, W. I.: July 18, 1918, D. Stoner, 18 females, 3 males of type series of C. antigiiensis Bueno. Virgin Islands: Anagarda, V. I., Ill, 31, 1925 (A. M.N. H.), 1 male, 2 females. Puerto Rico: Desengaiio, Dec, 1923, 2 females, June, 1924, 2 fe- males and 2 males (one of them with reversed asymmetry) (Cornell V. Lot 719) . Arecibo, July 30-Aug. 1, 1914, 1 female (A. M. N. H.) . Coamo Springs, Dec. 27, 1914, 2 females. Camuy, Isabela, May 12, 1935, Julio Garcia Diaz, 2 males, 17 females. Near Isabela, May 12, 1935, Julio Garcia Diaz, 32 males, 52 females. Cartagena Lagoon, Feb., 1935, 2 males. Cartagena Lagoon, Aug. 10, 1935, and Feb. 23, 1935, Julio Garcia Diaz, 26 males, 19 females. Mayaguez, Oct. 22, Western Hemisphere Corixidae 441 1932, V. B. Diaz, 1 male, 1 female, and Dec, 1932, C. Antolin, 1 male. Tortugiiero Lake, March 20, 1935, Julio Garcia Diaz, 2 males, 4 females and nymphs. Cabo Rojo, June 9, 1937, J. A. Ramos, 1 male. Haiti: Port au Prince, Feb., 1925, G. N. Wolcott, 1 female. Jamaica, B. W. I.: Claremont, Baron Hill, Trelawny, Feb., 1928, 3 males, 5 females; March 4, 1928; Nov. 12, 1928, 5 males, 13 fe- males; L. G. Perkins, 7 males, 12 females. Claremont, Feb., 1928, Lilly G. Perkins, 4 females, 3 males. Lmnsden, Tjdenham?, St. Ann, Stg. pond, 2, 1928, Lilly G. Perkins (8 males, 14 females). April 20, 1909, A. E. Wright (Cambridge Mus., 1 female). Jamaica, H. G. Klages (det. C. kollarii Fieb. by Kirkaldy), female (Kirk. Coll.). Jamaica, Aug. 5 (Uhler Coll.), 2 males, 3 females, 1 nymph. Trinidad, B. W. I.: Trinidad, Oct. 27-29, 1938, C. J. Drake (Drake Coll.), 1 male, 2 females. Jamaica, Nov. 7, 1 male, 2 females. Montego Bay, March 15, 1911 (A. M.N. H.), 1 female. Jamaica (U. S. N. M.), 3 males, 3 females, 2 nymphs. Mandeville, 4-12- 1937, Chester Roys, small pond, 2,000 ft. elev., 17 males, 23 females. Spanish Town, 4-10-1937, Chester Roys, 1 female. Cuba: Cataline, Cuba, Havana Prov., Nov. 27, 1933, P. J. Ber- mudez, 5 female (K. U. Col.). Matanzas, Yum? Valley, Dec. 9, 1933, P. J. Bermudez, 1 male (K. U. Col.). Matanzas Rio Canima, Dec. 12, 1933, P. J. Bermudez, 1 female (K. U. Col.). Jutrica Alto Songo, Nov. 9, 1924 (A. M. N. H.), 3 males, 3 females. Cayamas, E. A. Schwarz, 2 females (U. S. N. M.). Guanajay, May 3, Palmer and Riley, 1 female (U. S. N. M.). Cuba (Uhler Coll.), 2 females, 1 male. Cuba (Cambridge) , 1 female. Havana, Cuba, C. F. Baker, 1 male. Cuba, Ch. Wright (Cambr.), 1 male. Santiago de las Vegas, Cuba, Dec. 10, 1922, 1 female. Santiago de las Vegas, Cuba, Sept. 5, 1923, S. C. Bruner, 2 females, 1 male. Santiago de las Vegas, Cuba, Oct. 31, 1922, 1 female. Mexico: Mex. Col. Signoret, 1 female. Yucatan: Yunca Aguada, July 29, E. P. Creaser. Campeche: Palizada, Sept. 15, 1936, H. D. Thomas, 2 males, 3 females; Champoton. Yalic Aguada, July 14, E. P. Creaser. Chiapas: Comitiin, Aug. 30, 1937, H. D. Thomas, 6 females; Comitan, Jan. 18, 1938, 1,800 M., Oct. Utrilla L., 3 males, 6 females; Tepanquapan, Oct. 28, 1937, H. D. Thomas, 2 males, 3 females; Lake Tepanquapan, Aug. 29, 1937, H. D. Thomas, 2 males, 1 female; Hda. La Libertad, Sept. 1, 1937, H. D. Thomas, 1 female; La Libertad, Jan. 1, 1938, Octavio Utrilla L., 500 m. a. s. 1., 4 males, 4 females. Hidalc^o: Agua Fria, July 28, 1937, 5 males, 442 The University Science Bulletin 11 females; Nov. 4, 1938, H. D. Thomas, 3 males, 6 females; Agua Fria, Aug. 27, 1944, Henry Thomas, 1 male, 1 female; Tainaidipas: San Carlos Mts., San Jose, July, 1930, Dice Bartlett, 1 male, 1 fe- male; 5 m. s. Ciudad Victoria, Nov. 5, 1936, H. D. Thomas, 1 male, 1 female. U. S. A.: Texas: Alfred, July 24, 1928, R. H. Beamer, 1 female. Centrocorisa kollarii (Fieb.) (Plate LXX, figs. 2, 2a-2d) 1851. Cori.sa kullari Ficlicr, F. X. Species Generis Corisa. Prague Sep., p. 17, PI. I, fig. 7. (Types from Brazil in Naturhistorisches Museum. Examined by Hungerford, 1928.) 1859. Corixa kollarii Fieber cited by Dohrn, in Catalogus Hemipterorum Stettin. (Ref. only. ) 1899. Corixa kollarii, Kirkaldy, G. W. Bolletino Musei di Zoologia ed Anatomia Com- parata, Turino, XIV, No. 347, pp. 1-2. (Dist. Ecuador, Bolivia.) 1S9'.). Corixa {Callicorixa) kollarii, Kirkaldy, G. W. Bolletino Musei di Zoologia ed Anatomia Comparata, Turino, XTV, No. S.'iO, pp. 7-8, figs. 3-4-5. (Specimens from Ecuador described.) 1899. Corixa kollarii, Kirkaldy, G. W. Bolletino Musei di Zoologia ed Anatomia Com- parata, Turino, XIV, No. 352, p. 1. (Dist. "Caiza.") 191)1. Corixa kollari. Champion, G. C. Biologia Centrali-Americana, Vol. II, p. 377. (In part: The Presidio de Mazatlan record.) 1909. Callicorixa kollarii, Kirkaldy, G. W., and Torre-Bueno, J. Ri. de la. Proc. Ent. Soc. Washington, X, p. 19-4. (In part: The South American records.) 1925. Corixa (Callicorixa) kollarii, Campos. Rev. Col. Nac. Nicente Rocafuerte, Guaya- quil, VII, p. 44 (Quot.). 1928. Centrocorisa kollari, Lundljlad. O. Entomologisk Tidskrift, XLVIII, Haft 4, p. 223. (Refers to Kirkaldy, 1899.) 1928. Criilrccorisa kollari, Lundhlad, O. Entomologisk Tidskrift, XLIX, Haft 2, p. 18, footnote. (In part: proposes new generic name.) 1929. Centrocorisa kollari var. dispar Lundhlad, O. Entomologiske Meddelelser Koben- havn, XVI, pp. 281-283, figs. 2-5, PI. I. (Types in Universitetets Zoologiske Museum, Co- penhagen from Colombia.) ,1930. Centrocorisa kollari, Jaczew.ski, T. Mitteilungen aus dem Zoologischen Staatsinstitut und Zoologischen Museum in Hamburg, XLIV, p. 145, fig. 4. (From Costa Rica, probably this species.) 1931. Centrocorisa kollari, Jaczewski, T. Annales Musei Zoolcigici Polonici, IX, No. 15, p. 196, PI. XXV, fig. 11. (Mexico, probably this species.) 1939. Centrocorisa kollari var. dispar, Jaczewski, T. Annales Musei Zoologici Polonici, XIII, No. 23, p. 296. (In part.) Size: Length: 5.88 mm. to 7.56 mm.; width across head: 2.1 mm. to 2.94 mm. The males on the average smaller than the fe- males. A broad, compact species. Color: General facies medium brown. Pronotum crossed by 7 to 9 brown bands, some of which may be broken or incomplete, its rear margin brown. The clavus with the basal transverse brown bands often furcate and narrower than the pale interspaces. The remainder of clavus, corium and membrane covered with reticulate figures. Embolar area usually blackish in front of the nodal furrow and whitish beyond. Venter yellow except that of male may be somewhat darkened. Western Hemisphere Corixida 443 Structural characteristics: Head of female broad and short as seen from above; the vertex broad, less curved than the eyes; the synthlipsis broader than the eye. The male vertex obtusely angled ; the facial impression obtusely angled above in the male. Both sexes with some fine white hairs on the front. The fourth antennal seg- ment not quite half the length of the third. No median carina on pronotum. The pronotum and clavus lightly rastrate, remainder of hemelytra punctate, shining, and covered with short hairs. The female hemelytron with a definite hair tuft or patch on the corium near the nodal furrow and a linear strip of longer hairs on the clavus near the distal third of the claval suture. The pruinose area of embolar groove posterior to nodal furrow short in both sexes but almost at end of embolar groove in the female. The costal margin of embolium of female broadly indented and thickened in front of nodal furrow. Mesoepimeron slender with osteole of scent gland not far from its tip. Metaxyphus long, rather large. Front femur pilose on anterior basal half and broadest beyond the middle. The tibia of the male with a flattened triangular prolongation. The pala of male as shown on Plate LXX. It bears two rows of pegs, the upper one of about 20 pegs, the lower one interrupted, about a dozen pegs in the basal part and eight setiform pegs in distal part. Mid- dle and hind legs stout. Hind femur with an irregularly set row of short spines on the dorsal surface above the distal margin and many scattered on ventral surface. Middle leg: Femur : tibia : tarsus : claws : : 100 : 53.8 : 33.8 : 46.1. Hind leg: Femur : tibia : tarsus 1 : tarsus 2 : : 100 : 94.4 : 123 : 51.5. Male asymmetry dex- tral, no strigil. Genital capsule as shown on Plate LXX, the tip of the left clasper not knob-like. Comparative notes: This species may be separated from C. nigri- pennis by characters given in the key. Location of types: Fieber wrote "Habitat in Brasilia (Mus. Vienn.) Insula Cuba (Mus. Berol.)." The specimens in Vienna labeled "Natterer Brasilien" should be considered the types and I select a male and female as the lectoholotype and lectoallotype. Data on distribution: (Plate LXXII.) Originally described from Brazil and Cuba, a mixture of two species, those from Cuba being C. nigripennis Fabr. The following published records apply to this species: Brazil, Bolivia, Ecuador, Venezuela ?, Costa Rica, Mexico: Colima and Presidio de Mazatlan. I have before me for study specimens from the following places: 444 The University Science Bulletin Brazil: "Natterer Brasilien," "Kollari det Fieber," 1 male. "Bra- silien Cuming 847", "Kollari det Fieber", 2 females. Custodia Per- nambuco, Lat. 8, Long. 38, No. 5462, Stillman Wright, 5 males, 3 females. Bekm, Perntimbiico, Lat. 9, Long. 39, No. 643. Stillman Wi'ight, 2 males, 2 females. Paraguay: Villarrica Coraveni, Jan. 8, 1923, Schade, 2 males, No. 28168. Molinasque Dept. Cariiga, Oct., 1925, F. Schade, 5 males, 1 female. B'olivia: "Dr. Borelli" determ. C. kollarii by Kirk., 1899, and marked cotype of his paper. Peril: Vic. Rioja, Dept. San Martin, 900 m. a. s. 1, Sept. 9-Oct. 3, 1936, F. Woytkowski, No. 3682, 1 male. Vic. Guayabamba, Dept. Amazonas, Andes, 3,000 m. a. s. 1., ponds and pools, Aug. 14-19, 1936, F. Woytkowski, No. 3668, 1 male. Prov. Tarma, Dept. Junia, Palmapata Jungle, 1,400 m. a. s. 1., October 10-20, 1940, F. Woyt- kowski, No. 408. Vic. Chachapoyas, Dept. Amazonas. Andes, 2,000 m. a. s. 1., Aug. 4-10, 1936, F. Woytkowski, No. 3671, females (hair patches), Vic. Guayabamba, Dept. Amazonas, Andes, 1,300 m. a. s. 1., Aug. 14-19, 1936, bogs and pools. No. 3667, F. Woytkowski, 13 males, 2 females (hair patches). Vic. Guayabamba, Dept. Ama- zonas, Andes, 1,300 m. a. s. 1., Aug. 14, 1936, bogs and pools, No. 3665, F. Woytkowski, 35 males, 49 females. Ecuador: "La Concepcion, Valle del Mira," Turin Museum, marked cotype of his paper by Kirkaldy, 3 females. Colombia: Bogota, Coll. Signoret, 2 females. Call, Colombia, from W. F. H. Rosenberg, 3 females. Villavieja, 1944, R. A. Stir- ton, 3 males, 1 female. Costa Rica: Rio Virilla, Dec. 26, 1931, Heinrich Schmidt, 42 males, 24 females. San Jose, Heinrich Schmidt, 1932, 2 males, 8 females. San Jose, Heinrich Schmidt, 1932, 8 males, 29 females. San Jose, Heinrich Schmidt, June and July, 1931, 7 males, 22 fe- males. San Isidro del Gen., 2,000 ft., Feb., 1939, Dean L. Rounds, 3 males. Guatemala: Los Amatas, Kellerman (Cambr. 2 males, 2715, 1 female, has hair patches). Mexico: Chiapas: Ocozocoautla, Aug. 3, 1937, H. D. Thomas, 7 males, 13 females; La Libertad, Jan. 1, 1938, Octavio Utrilla L., 500 M. above sea, 30 males, 39 females; San Vicente, Jan. 4, 1938, Oct. Utrilla L., 12 males, 5 females; Hda. La Libertad, Sept. 1, Western Hemisphere Corixidae 445 1937, H. D. Thomas, 28 males, 29 females; La Libertad, Jan. 1, 1938, Octavio Utrilla L., 500 m. a. s. 1., 11 males, 12 females. Guerrero: Ocotito, Kl. 363, S. of Mex. City, Nov. 2, 1936, H. D. Thomas, 1 female; Rio Agua, Kl. 437, S. of Mex. City, Oct. 31, 1936, H. D. Thomas, 4 males, 6 females; Rio Balsas, Kl. 259 S. of Mex. City, Oct. 31, 1936, H. D. Thomas, 4 females; Acapulco, Aug. 22, 1938, H. D. Thomas, 4 males, 5 females; Acapulco, Kl. 444 S. of Mexico City, Oct. 7, 1938, H. D. Thomas, 15 males, 9 females; Tierra Colo.. Kl. 377 S. of Mexico City, Oct. 31, 1936, H. D. Thomas, 1 male; La Sabana, Kl. 226 S. of Mexico City, Oct. 20, 1936, H. D. Thomas, 1 male; Iguala, Oct. 7, 1936, H. D. Thomas, 1 male. Morelos: Cuernavaca, Oct. 5, 1936, H. D. Thomas, 1 male. Jalisco: Mazatlan, May 1, 1934, H. Hinton, 4 males, 6 females. Sonoi-a: Salitial, Rio Mayo, Feb. 23, 1935, H. S. Gentry, 1 male, 2 females. Chihuahua: Carimechi, Rio Mayo, Jan. 6, 1935, H. S. Gentry, 2 males. Lmver California: Triunfo, July 7, 1938, Michelbacker and Ross (Calif. Acad.) ; 20 miles N. of Comondu, July 23, 1938, Michelbacker and Ross (Calif. Acad.). 446 The University Science Bulletin PLATE LXX Centrocorisa Lundblad Fig. 1. Centrocorisa nigripennis (Fabricius) ; pala of male. Fig. la. Genital capsule of male. Fig. lb. Left hemelytron of female. Fig. Ic. Dorsal view of male abdomen. Fig. 2. Centrocorisa kollarii (Fieber); pala of male. Fig. 2a. Genital capsule of male. Fig. 2b. Left hemelytron of female. Fig. 2c. Dorsal view of male abdomen. Fig. 2d. Left hemelytron of female, showing hair patches. Western Hemisphere Corixidae 447 PLATE LXX C NIGRIPENNIS (f/JSR.) 2. C KOLLARI (['IEB) CENTROCORISA LUNDBL. 448 The University Science Bulletin Ramphocorixa Abbott 1912. Abbott, J. F. Canadian Entomologist, LXIV, p. 120. (New genus lor R. balanodis n. sp.) 1917. \'nn Duzee, Edward P. Catalogue of the Hemiptera of America North of Mexico, p. 478. 1920. Hungerford, H. B. Kansas University Science Bulletin XI, p. 212. 1926. Blatchley, W. S. Heteroptera or True Bugs of Eastern North America, p. IOIn. 1928. Jaczewski, T. Annates Musei Zoologici Polonici, VII, pp. 55, 58. 1935. PoLsson, R. Archives de Zool. Exp. et Gen., LXX\1I, p. 458. 1945. Griffith, M. E. Kansas University Science Bulletin, XXX, Pt. II, pp. 241-3' 5. Moderately small corixids having a short pronotum thai is broadly rounded behind and in museum specimens conspicuouslj' ex- poses the apex of the scutellum. Pronotum and clavus finely ras- trate. Color pattern often effaced, but when distinct with about six brown bands on pronotum. and reticulations of hemelytra in longi- tudinal, but often faint, series. An uniugmented field always i>res- ent on basal part of clavus. Lateral lobe of prothorax Ungulate. The palar claw serrated on basal half in both sexes.* The infra- ocular space narrow and the hypo-ocular suture short. The embolar groove long, the pruinose area posterior to nodal furrow nearly one- half as long as the cubital ridge. The pruinose area of claval suture is long and lies mostly on the claval side. The distal half of costal margin anterior to nodal furrow more or less flattened and shining in females as seen from lateral view. The males characterized by a distinct carina on the anterior portion of vertex, by a deep cleft on dorsal margin of pala, by a dextral abdominal asymmetry, and by a small strigil which consists of a single comb. Genotype R. acu- minata (Uhler). The two species may be distinguished as follows: A. Vertex of male strongly keeled and pnjniinently produced. Female usually lacking conspicuous pigmentation on abdominal venter R. acuminata (Uhler) AA. Vertex of male not as above. Female typically marked Vjy brown or black on the sides of the last two or three ventral abdominal segments. R. rotundoccphala Iiuugerford Ramphocorixa acuminata (Uhler) (Plate LXXI, figs. 1, la-le; wash drawings 17 and 18, Plate V) 1897. Corixa acuminata Uhler, P. R. Trans. Maryland Acad. Sci. (Baltimore) I, p. 392. 1904. Corisa acutrllata Crevecoeur, F. F. Trans. Kans. Acad. Sci. XIX, p. 234 (in stock pond, Mar.-Oct.) 1912. Ramphocorixn balanadis Abbott, .1. F. Canadian Entomologist XLIV, p. 118-120, plate IV. (Describes as new genus, new species and records eggs on crayfish and gives life history.) 1912. Ruiitphocorija halanodi-g. ,\bbott, .1. F. .\merican Naturalist XLVI, pp. 553-555. (Symbiotic relation between a water bug and a crayfish.) * Often discernible only under lf)w power compound microscope. Western Hemisphere Corixidae 449 lUlT. Fianiplwcorixa a 1943. Callicorixa. nooriikensis, McCluie, H. Elliott. Ecological Monographs XIII, p. 14 (permanent pool.?; eggs in June, new adults in early August). Size: Lengtli ti.T nun. to 7.7 mm. Head width 1.9 mm. to 2.2 mm. General shape slender. Color: General facies medium brown. Pronotum crossed by about a dozen fine, irregular brown lines. Lines of clavus arranged in regular series; those of corium more broken and irregular; mem- branal pattern mottled, separated from corium by pale line. Em- bolium yellowish white. Head and limbs yellow. Black spot on hind leg restricted to inner margin of apical fourth of first tarsus. Thoracic venter black, abdominal venter yellow. Structural characteristics: Head about one-third as long as pro- notal disk; vertex slightly produced; facial hairs few; male fovea broad but shallow; synthlipsis wider than width of an eye. Anten- nal segmentation: 1 : 2 : 3 : 4 : : 22 : 18 : 43 : 33 ^J ; 1 : 2 : 3 : 4 : : 22 : 20 : 42 : 33 5 . Pronotum with carina plainly vis- ible on anterior third; pronotum and hemelytra strongly rastrate, the latter with numerous short, pale hairs, longer on membrane and inner margins of clavi. Lateral lobe of prothorax about half as wide as long, scjuared across apex. Mesoepimeron narrow with osteole near the tip. Aletaxyphus about as broad as long, tapering to a point ajiically. Foreleg of male: pala only slightly longer than tibia; inner margin of dorsal surface curved abruptly outward before apical third; pegs in two rows, the upper overlapping the lower. Ten to twelve teeth in upper row, thirteen to fourteen teeth in lower row. Teeth of lower row not approaching apex of tibial pad, remote from it. Upper palmar row of bristles inter- rupted apically with 3 or 4 stouter bristles inserted near claw. 478 The University Science Bulletin Tibia with thin, dorsal carina extending from apex ahiiost to base. Pad of moderate size, outlines on basal edge with row of bristles. Femur relatively slender, with dense patch of long hairs on inner surface about half way from base. Row of stout spines extending from distal edge of hair patch to apex of femur. On dorsal margin of femur a pair of long hairs on apical third. Foreleg of female: pala long and slender, tapering to point. Tibia about two-thirds as long as pala, the inner surface with 2 long, stout hairs, the apical margin with row of spines. Femur slender with stiff hairs on inner surface arranged in groups of 2 or 4. Patch of short hairs on inner basal surface. Dorsal margin with 2 long hairs on apical third. Middle and hind legs slender. Middle leg wdth claw slightly shorter than tarsus. Hind femur without spines on dorsal margin. Segmentation: Middle leg: femur : tibia : tarsus : claw :: 100 : 51 : 36.8 : 33.8; Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 82.1 : 111 : 46.6. Male asymmetry dextral, strigil absent. For de- tails of male abdomen and genitalia see Plate LXXIV, figs. 2e and 2d. Comparative notes: This species most closely resembles producta (Renter) from which it differs in having the male pala broader and in having the inner margin of dorsal surface of male pala curved abruptly outward before apical third. The females are indistin- guishable from the standpoint of structural differences. Since C. •producta is European while noorvikensis is a North American spe- cies, localities will serve to separate the females at present. Location of types: Described from 70 specimens labeled Kobuk river, Aug. 6, 1925, P. Scott, Noorvik, Alaska. Holotype, allotype and paratypes in the Francis Huntington Snow Collections, Uni- versity of Kansas, Lawrence, Kansas. * Data on distribution: (Plate LXXVIII.) Besides the type series we have the following: Siberia: Bering Id., 1882-'83, L. Stejneger, collector, 4 males, 6 females (U. S. N. M.) ; pond near Kolyma River, Sept., 1914, 1 male, 1 female. Alaska: Aleutian Islds., June, 1944, Bernard McDermott, 3 males, 4 females. Canada: Yukon Territory: White Horse, May 7, 1912, Jessup (Parshley) 1 female. Manitoba: Churchill, Lake Isabella, June 9, 1936, H. E. Mc- Clure, 2 males, 6 females, and on June 29, 6 females. AVestern Hemisphere Corixidae 479 CalUcorixa praeiista (Fieber) (Wash drawing No. 281 on Plate VI and Plate LXXIII, figs. 1, la-Id) 1848. Corisa praensta Fieber, F. X. Bull. Soc. Nat. Mosc, XXI, Pf. 2, p. r)21. PI. 10, figs. 14, 22. (For other references up to 1927 see Lundblad below.) 1927. Calticorixa praeusta, Lundblad, O. Ent. Tid.-*krift, XLVIII, Hiift 2, pp. 80-83, text figs. 1, 2, PL VI, figs. 37-45, PL VII, figs. 47, 48. 1928. CalUcorixa praeusta, Hungerford, H. B. Ann. Ent. Soc. Amer. XIX, p. 462. 1930. Siyara. (CalUcorixa) praeusta, Jones, H. P. Entomologists Record, XL-XLII, re- print, p. 76. 1933. CalUcorixa praeusta, Prokofiewa, Alexander. Zeitschrift fur Zellforschung und Mi- kroskopische Anatomie XIX, Hefte 1, p. 10, abb. 7a-b (chromosome study). 193.'). Sigara (CalUcorixa) praeusta, Poisson, R. Archives de Zool. Exp. et Gen. LXXVII, pp. 554-555, fig. 76. 1935. CalUcorixa praeusta. Von Mitis, Heinz. Zeitschrift fiJr Morphologie und Okologie der Tiere XXX, Heft 4, p. 487 (stridulation). 1935. Sigara (CalUcorixa) praeusta, Stichel, Wolfgang. Illustrierte Bestimmungs — Tabellen der Deutschen W^anzen, Lief 11, p. 319. figs. 767 to 772. Also Lief 12, p. 331 (Syst. Kat- alog). 1936. Sigara praeusta, Lindberg, Hakan. Die Tierwelt der Nord und Ostsee, Lief 30, .p. 114, fig. 7. 1936. Sigara (CalUcorixa) praeusta, Poisson, R. Bull, de la Soc. Sci. de Bretagne XIII, Fasc. 1 and 2, pp. 11-12. 1936. CalUcorixa praeusta, Walton, G. A. Ent. Mo. Mag. LXXII, p. 20 (occurs spar- ingly in Somerset). 1936. CalUcorixa praeusta, Lundblad, O. Ent. Tidskrift LVII, Hiifte 1, p. 59 (ecol. note). 1937. CalUcorixa praeusta, Thompson, Gordon B. Ent. Mo. Mag. LXXIII, p. 163. 1937. CalUcorixa praeusta, Wagner, Eduard. Verhandl. des Ver. f. naturw. Heiiiuit- forschung zu Hamburg XXV, p. 63. 1938. Sigara praeusta, Michalk, Otto. Sitzungsberichte der Naturforschenden Gesellschaft zu Leipzig, 63-64 Jahrgang 1938, p. 164. 1938. Sigara (CalUcorixa) praeusta. China, W. E. Ent. Mo. Mag. LXXIV, p. 38. 1939. Sigara praeusta, Macan, T. T. Freshmater Biol. Assoc, of British Empire Sci. Pub. No. 1, p. 17, figs. 19A, 20B, 21B, 22K. 1939. Sigara (CalUcorixa) praeusta, Wroblewski, A. Fragmenta Faunistica Musei Zoolo- gici Polonici IV, p. 118. 1942. Corixa (CalUcorixa) praeusta, Walton, G. A. Trans. Roy. Ent. Soc. London, XCII, No. 2, pp. 429-30, figs, lla-d, 26 h-j ; 12d. 1940? Corixa praeusta. Brown, E. S. Trans. Dumfriesshire and Galloway Nat. Hist, and Antiquarian Soc. XXIII, p. 7. Size: Length 6.1 mm. -6.8 mm. Width of head 1.9 mm. -2.1 mm. Color: General facies brown. Pronotum crossed by about 10 brown lines, slightly narrower than pale areas. Brown lines of clavus and corium more or less regular, tending to coalesce on inner apical angle of corium. Membrane separated from corium by pale band. Membranal pattern mottled and confused. Embolium yel- low to smoky. Head and limbs yellow; first tarsal segment of hind leg with black spot on distal third, no black on second tarsal seg- ment. Venter smoky to black. Structural characteristics: Head about two-thirds as long as pro- notal disk; vertex rounded; facial hairs few; male fovea broad but shallow; synthlipsis equal to width of an eye. Antennal segmenta- tion : 1 : 2 : 3 : 4 : : 25 : 18 : 47 : 30 males ; 1 : 2 : 3 : 4 : : 25 : 18 : 480 TllK rMVlHSITY S(MKN(-F. lill.I.K 11 N 43 : 30 foniaU's. Pronotuin with modian carina visihK' on anterior third; roundtd apically. Pronotmn and hcnu'lytra heavily rastrate, the hiltia- with a few fine pale hairs on nieinbrane. Pruinose area of chixal >ntnre narrow as compared to those of (\ tctoni n. sp. and C. alaskensis Hungerford. Lateral h^lu' o( prothorax ahont lialf as wide as long a.nd rounded apically. Mesoepimeron narrow, osteole close to tip. Metaxyphus longer than broad, tapering to sharp point. Foreleg of male: Sides parallel at base, curving outward on dorsal margin about midway. Distal edge thin and curved inward. Dorsal margin concave l)efore curve. Teeth divided into two rows, the distal row not o^•erlapping basal row. The former with about 10 teeth, the latter with about 18 teeth close to upper palmar row and extending almost to tibial pad. Upper palmar row oi bristles interrupted apically with about 4 teeth inserted near claw. Tibia with pronounced dorsal carina ending apically in a large pad and extending backward about two- thirds of way to l)ase. About two-thirds as long as pala. Femur relatively slender with patch of stridulatory pegs in about 10 rows on imu-r surface near base. Row of spim>s extending from apical margin of pegs to apical margin oi femur. Foreleg of female: Pala long and slender, tapering to a jioint. Tibia about half as long as pala, wedge-shaped, narrower at base than at apex. Femur slender with patch of tine hairs on inner basal surface. Row of spines ex- tending from distal end of patch to apex of femur. Middle and hind legs slender. Middle claw equal to tibia. Hind femur without row t)f spines on dorsal margin. Relation of segments: Middle leg: femur : tibia : tarsus : claws :: 100 : 4(1.5 : 33.8 : 33.8; hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 86.1 : 107.'2 : 46.6. Right tergitc of seventh abciominal segment with sharp lateral production. For details of male ali(iomen and aenitalia see Plate LXXIII, tigs, la and Ic. Conipiiratirc notes: This is a Ktiropean species and the only American species that is near it is ('. ridncrutu triileri. However, the male palae are tmlike and the females have the iiruinose area of claval suture narrow instead of broad as in the American species. Location of types: Fieber, in describing this species, gave as its distribution "In Bohmen, Preussen (Breslau. Scholz) Sachsen, Russland (Kason. Eversmaim; Petersburg. Kolenatil Lappland (Kretschmar) Sitkha (Berlin Mus.) Unalascka (Chamisso)." The last two records nmst Ix' basetl on misidentitied sjiecimens that are })robably C. alaskensis Hungertnrd. Western Hemisphere Corixidae 481 Data on distribution: (Plate LXXVIII.) This widely distributed European species does not occur in North America. We have speci- mens from the following places: British Isles: Forres, Scotland, 3 males, 6 females. England. P. Shobdon, Oct. 6. 1935, G. A. Walton, 2 males, 2 females. N. Wales. Bodesi, Llyn Ogwen, Caernarvon Co., Peat Diggings, April, 1935, G. A. Walton. 1 male, 1 female; X. Wales, Snowdonia, Caernarvon Co., small lake, April 21, 1935, G. A. Walton, 1 male, 2 females; N. Wales, N. R. Banger Llyn Cororion. April. 1935, G. A. Walton, 29 males, 29 females. Sweden: Upsala, Aug. 20, 1928, Linnean Garden pool, H. B. Hungerford, 1 male, 4 females. Poland: Aug. 12, 1922, T. Jaczewski, 3 males, 2 females. Russia: Przhevalsk, Pedatenko, 3 males, 1 female. Callicorixa vulnerata (Uhler) 1861 (Plate LXXIII, figs. 2, 2a to 2j) 1861. Corixa vulnernta Uhler, P. R. Proc. .^cad. Nat. Sci. Phila., XIII, \,. 284 (Desc. from Washington Terr.). 1876. Corixa vulnerata. Uhler, P. R. Bull. U. S. Geol. Geog. Surv. I, No. 5, i). 340. 1876. Corixa vulnerata, Uhler, P. R. Reprint of above, separately paginated, p. 74 (Mont., Ore., N. 111. and N. W. Terr, of U. S.). 1878. Corisa vulnerata, Uhler, P. R. Bull. U. S. Geol. Geog. Surv". IV, p. 509 (Milk River, Montana). 190&. Arctocorisa vulnerata, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 197. 1917. Arctocorixa vulnerata. Van Duzee, E. P. Catalogue of the Hemiptera, p. 485. 1926. Arctocorixa vulnerata, Blatchley, W. S. Heteroptera of Eastern North America, p. 1081. Size: Length 7.1 mm. to 8.1 mm. Width of head 2.2 mm. to 2.5 mm. General shape slender. Color: General facies medium to dark brown. Pronotum crossed by 9-10 brown lines equal in width to pale ones. Claval lines narrow and regular at base, broader and irregularly furcate distally. Dark bands of corium broken and irregular throughout; not coalescent at inner apical angle. Membrane separated from corium by pale line, pattern reticulate. Embolium yellow to smoky. Head and limbs pale, except for black spot on apical third of first tarsal segment of hind leg. Venter smoky to black. Dorsal surface of tibia of foreleg heavily infuscated. Structural characteristics: Head about half as long as pronotal disk; vertex rounded; facial hairs few; synthlipsi? greater than 31—822 '^ 482 The University Science Bulletin width of an eye; male fovea broad but not deep; antennal segmen- tation: 1 : 2 : 3 : 4 : : 28 : 18 : 47 : 30 J ; 1 : 2 : 3 : 4 : : 28 : 20 : 42 : 30 5 . Pronotum rounded apically. Median carina visible on anterior third. Pronotum and hemelytra moderately rastrate. the latter with a few long hairs on corium and membrane. In female, patterned portion of basal angle of corium extending about two- thirds of way along pruinose area of claval fold. Lateral lobe of prothorax with sides parallel in female, tapering slightly in male, about half as wide as long. Mesoepimeron narrow, osteole near tip. Metaxyphus a little longer than wide, bluntly pointed apically. Front leg of male: pala bluntly rounded apically from dorsal mar- gin to claw. Pegs in two rows, the distal row consisting of about twelve teeth, not overlapping basal row of about twenty-four teeth. Apical two or three teeth of basal row sometimes out of line, curving dorsally toward distal row. Upper palmar row of bristles inter- rupted apically and one to three pegs inserted close to claw. Tibia about two-thirds as long as pala. Dorsal carina pronounced, arising almost at base and terminating distally in a large round pad. A fringe of spines bordering distal margin of tibia below pad. Femur relatively slender with pilose area on inner basal margin. A few rows of stridulatory teeth scattered among hairs. A row of spines extending from distal edge of hair patch to apical margin of femur. Dorsal margin without a pair of stout spinelike hairs. Foreleg of female: pala of usual shape. Tibia with a fringe of spines along apical margin. Femur slender with patch of short hairs on inner basal margin and a row of spines extending from patch to apical margin. Dorsal margin without a pair of stout, spinelike hairs. Middle and hind legs slender, the middle leg with its claw equal in length to the tarsus. Relation of segments: Middle leg: femur : tibia : tarsus : claw : : 100 : 44.9 : 33 : 33. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 88.8 : 111 : 51.1. The dorsum of abdomen and genital capsule of male as shown on Plate LXXIII. Location of types: In the Uhler collection of the U. S. National Museum are two females labeled "Corisa vulncrata Uhler, N. W. B. Surv., Dr. Kennerly." These are labeled by Uhler and are the spec- imens from which the description was drawn. One of these females may stand as the lectotype and is now so labeled. Since the male has not been described, we have selected a male allotype and six parallotypes labeled "Arhngton, Washington, 7-28-1931, L. D. An- derson." These were taken with 11 females from the same place. Data on distribution: (Plate LXXVIII.) This species was de- Western Hemisphere Corixidae 483 scribed from Washington territory and the piibhshed records, all by Uhlcr, are Montana, Oregon, Northwest territories of the U. S. and N. Illinois. We cannot verify the Illinois record. We have before us the following: United States: Washington: Arlington, July 28, 1931, L. D. Anderson, 7 males, 11 females; Kalama R., July 21, 1931, L. D. Anderson, 1 female; Naches, July 7, 1935, R. H. Beamer, Jr., 1 fe- male; Cliff dell, July 7, 1935, Jack Beamer, 1 female; Olympia, 1 female; Copalis, July 25, 1931, L. D. Anderson, 2 males, 2 females. Oregon: Union, July 13, 1931, L. D. Anderson, 1 male; Hood R., July 17, 1931, L. D. Anderson, 1 male, 1 female; Portland, L. Levin- son, December 9, 1895, 1 male, 1 female; Grants Pass, July 12, 1935, Jack Beamer, 2 males; Crater Lake Park, Pole Bridge Meadows, 6,000 ft., August 15, 1930, H. A. Scullen, 2 males, 2 females; Modoc Point, July 1, 1935, Jack Beamer, 8 males, 11 females; Florence, July 11, 1935, R. H. Beamer, 1 male, 1 female; Waldport, July 11, 1935, R. H. Beamer, 4 males, 3 females; Hot Lake, July 13, 1931, M. W. Sanderson, 2 females. California: Berkeley, June, 1917, W. W. Henderson, 1 male, 1 female; California (P. R. Uhler Coll.), 1 male, 3 females; Eureka, July 15, 1935, R. H. Beamer, 7 males, 8 females; Mono Lake, May 12, 1917, C. L. Fox (Calif. Acad.) ; Tahoe, 1 mi. so., July 28, 1929, R. L. Usinger (Calif. Acad.). Idaho: Burley, July 6, 1931, L. D. Anderson, 2 males, 2 females; Coolin, Priest Lake, July 18, 1927, E. C. Van Dyke (Calif. Acad.). Montana: Anaconda, August 12, 1931, L. D. Anderson, 1 male; Gallatin Co., May, 1925, 1 female. Utah: Fish Lake, August 1?, 1929, L. D. Anderson, 3 males, 7 females; Pleasant Grove, April 4, 1930, G:> F. Knowlton, 1 male; Lehi, April 4, 1930, G. F. Knowlton, 1 female; Benson Woods, April 8, 1930, G. F. Knowlton, 1 female; Provo Canyon, August 15, 1940, L. C. Kuitert, 1 female; Logan, July 19, 1922, E. P. Van Duzee (Calif. Acad.). Wyoming: Boulder, August 19, 1931, L. D. Anderson, 16 males, 17 females; Grand Teton Nat'l Park, August 18, 1931, L. D. Ander- son, 1 male, 1 female. Alaska: Popoff Island, Harriman Expedition, E. Kincaid, '99, 1 male. Canada: British Columbia: Bear Foot Mts., September 15, 1903 • (Bueno Coll.), 1 male, 1 female; Mission, Nov. 4, 1925, W. Dounes 484 The University Science Bulletin (Walley's record); Penticton, October 14, 1931, A. N. Gartrell (Waliey's record) ; Peachland, October 7, 1931, A. N. Gartrell (Wal- ley's record). Callicorixa wollastoni (D. & S.) (Plate LXXV, figs. 1, la to Id) 1865. Corixa wollastoni Douglas and Scott. British Hem., p. 603. (For other refer- ences before 1927 see Lundblad below.) 1927. Callicorixa wollastoni, Lundblad, O. Ent. Tidskrift, XLVIII, Haft 2, pp. 83-85, text figs. 3 and 4, PI. V., figs. 29-36; PI. Vll, figs. 49-50. 1933. Callicorixa wollastoni, Prokofiewa, Alexandra. Zeitschrift fiir Zellforschung und Mikroskopische Anatomie XIX, Hefte 1, p. 11, Abb. 8a-d (chromosome study). 1935. Sigara (Callicorixa) wollastoni, Poisson, R. Archives de Zool. Exp. et Gen., pp. 555-556, fig. 77. 1936. Sif/ara (Callicorixa) wollasfoiii, Poisson, R. Bull, de la Soc. Sci. de Bretagne, XIII, Fasc. 1 and 2, p. 12. 1936. Callicnria-a irollastoni. Lundblad, O. Ent. Tidskrift LVII, Hiifte 1, p. 59 (eco- logical note). 1938. Sigara (Callicorixa) wollastoni, China, W. E. Ent. Mo. Mag. LXXIV, p. 38. 1939. Callicorixa wollastoni. Pearce, E. J., and Walton, G. A. Trans. Soc. British Ent. VI, Pt. 7, pp. 158, 178. 1939. Sigara wollastoni, Macan, T. T. Freshwater Biological Assoc, of British Empire Sci. Publ. No. 1, p. 17, 25. 1942. Corixa (Callicorixa) wollastoni, Walton, G. A. Trans. Roy. Ent. Soc. London, XCII, No. 2, pp. 427-428, figs. Tie; 26a, b, e, i (C. wollastoni wollastoni and C. woUasfoni caledonica). 1043. Corixa wollaj. Dorsal view of male abdomen. Fig. 2. CalUcorixa producta noorvikcnsis Hiingerford; right clasper of male. Fig. 2a. Dorsal view of male pala. Fig. 2b. Front leg of male. Fig. 2<'. Tar.sal segments of hind leg. Fig. 2d. Genital capsule of male. Fig. 2e. Dorsal view of male abdomen. Fig. 2f. Hind femur of female. Fig. 3. Callicvrixa producta sackalinensis Matsumara ; right cla.sper of male. Fig. 3;i. Dorsal view of male pala. Fig. 3b. Front leg of male. Fig. 3c. Tarsal segments of hind leg. Fig. 3d. Genital capsule of male. Fig. 3e. Dorsal view of male abdomen. Western Hemisphere Corixidae 489 PLATE LXXIV CALLICORiy& B WHITE 490 The University Science Bulletin PLATE LXXV Callicorixa B. White Fig. 1. Callicorixa wollastoni (Douglas & Scott); front leg of male. Fig. la. Right clasper of male. Fig. lb. Genital capsule of male. Fig. Ic. Tarsal segments of hind leg. Fig. Id. Dorsal view of male abdomen. Fig. 2. Callicorixa alaskensis Hungerford; front leg of male. Fig. 2a. Front femur of female. Fig. 2b, 2c. Genital capsule of male showing aberrant claspers (Kodiak, Alaska). Fig. 2d. Right clasper of male. Fig. 2e. Genital capsule of male. Fig. 2f. Tarsal segments of hind leg. Fig. 2g. Dorsal view of male abdomen. Western Hemisphere Corixidae 491 PLATE LXXV CALLICORIXA B. WfCE 492 The University Science Bulletin PLATE LXXVI Calliconxa B. White Fig. 1. Calliconxa tetoni n. sp.; front leg of male. Fig. la. Dorsal view of male abdomen. Fig. lb. Genital capsule of male. Fig. Ic. Right clasper of male. Fig. Id. Tarsal segments of hind leg. Fig. le. Hind femur of female. P^G. 2. Calliconxa audeni Hungerford; front leg of male. Fig. 2a-2c. Pake of male showing variations. Fig. 2d. Tarsal segments of hind leg. Fig. 2e-2g. Right clasper of male, showing variations. Fig. 2h. Genital capsule of male. Fig. 2i. Dorsal view of male abdomen. Western Hemisphere Corixidae 493 PLATE LXXVI CALLlCORl'XA B WHITE 494 The University Science Bulletin PLATE LXXVII Callicorixa B. White Fig. 1. ('aUlcorixa* concinna (Fieber) ; dorsal view of male abdomen. Fig. la. Tar.sal segments of hind leg. Fig. lb. Right clasper of male. Fig. Ic. Front leg of male. Fig. Id. Genital capsule of male. Fig. 2. Callicorixa gebleri (Fieber) ; dorsal view of male abdomen. Fig. 2a. Tarsal segments of hind leg. Fig. 2b. Right clasper of male. Fig. 2c. Front leg of male. Fig. 2d. Genital capsule of male. * We do not believe concinna to be a true Callicorixa. Western Hemisphere Corixidae 495 PLATE LXXVII 496 The University Science Bulletin PLATE LXXVIII INDIAN OCEAN • CALLICOftlXA ALASKENSIS + C. AUDENI O C. CONCINNA 9 C. GEBLERI O C PRAEUSTA m C. PRODUCT A '^-x"^ '''^^OUCTA ^^P^ NOORVIKENSIS U C. PRODUCT A SACKALINENfils © C. TETON I ▲ C. VULNERATA O C. WOLLASTOm Western Hemisphere Corixidae 497 Hesperocorixa Kirkaldy (Including Anlicorixa Jaczewski) Hesperocorixa {Hesperocorixa ) 1908. Kirkaldy, G. W. Canadian Ent. XL, pp. 118-12n (new subg. of Arctocorisa hap- lotype //. hrimleyi Kirk.). 1917. \'an Duzee, E. P. Catalogue of the Hemiptera of America North of Mexico, p. 485. 192C. Blatchley, W. S. Heteroplera of Eastern North America, pp. 106.5 and 1081 (gives generic rank). 1928. Hungerford. H. B. Annals Ent. Soc. Amer. XXI, p. 140. 1928. Jaczewski, T. Annales Musei Zoologici Polonici VII, pp. 55-58. 1935. Poisson, R. .\rchives de Zoologie Experimentale et Generale . . . LXX\'II, p. 458. Hesperocorixa ( A nticorixa ) 1924. .laczewski, T. Annales Zool. Musei Polonici Hist. Nat. Ill, pp. 76. 83-84 {Anti- corixa as subg. of Callicorixa sens. lat. with C. sahihergi Fieb. as subgeneric type). 1935. Poisson. R. .\rchives de Zoologie Exp. et Gen. LXXVII, p. 504 (as subg. in Sigara). 1935. Stichel, W. lllustrierte Bestimmungs-Tabellen der Deutschen W.Tnzen. Lie! 11, pp. 313-317, Lief 12, p. 331 (as subg. of Sigara). 1930. Poisson, R. Bull, de la Soc. Sci. de Bretagne XIII, Ease. 1 and 2, p. (;. 193C. Jaczewski, T. Proc. Royal Ent. Soc. London, V, Pt. 2, Ser. B, p. 40 (as subg. in Sigam and redefines it. Includes C kennecottii LThlor which was shown to he very close to Hesperocorixa brimleyi Kirk, in 1928). 1938. China, W. E. Ent. Mo. Mag. LXXIV, p. 38 (as subg. of Sigara). 1940. Hutchinson, G. E. Trans. Conn. Acad. Arts and Sci. XXXIII, p. 414 (as subg. of Corixa). 1943. Walton, G. A. Trans. Soc. for British Ent. VIII, Pt. 5, p. 107 (as sulig. of Corixa). 1943. China. W. E. The Generic Names of British Insects, Pt. 8. p. 306 (as subg. of Corixa). For the most part these corixids are larger than average in size. The pronotuin is more or less rastrate in most species and the cla^•us and C'orium always show some rastrations even in H. laevigata (Uhlcrl. The pruinose area along the claval suture is shorter than the })ruinosc area beyond the nodal furrow, usually much shorter (one- third to one-half). The media vein usually reaches the nodal fur- row. Lateral lobe of the prothorax trapezoidal, often obliquely truncate at the apex. The metaxyphus well developed and long in most species. Pala of the male subparallel-sided, with a distinct carina on its dorsal base, apex of pala blunt, rounded or truncated, the upper margin meeting the lower one more or less at right angles at the insertion point of the claw; one row of pegs repeating more or less the curvature of the upper margin. Front tibia of males always with a subapical spiniform bundle of stiff hairs. The dorsal surface of the hind femur may be bare or provided with several rows of short spines, none so far known with a single row as in Corixa. The male strigil relatively large and usually oblong, elliptical, and, 32—822 498 The University Science Bulletin « on the right side, the males dextraL Tip of the genital capsule (ninth segment) of male usually considerably modified, penial sheath not modified as it always is in Corixa. Genotype: H. brimleyi Kirkaldy. The genus is holarctic in distribution. It is related to but gener- ically distinct from Corixa Geoffroy. In a critical examination of material from eastern Asia, Europe and North America it is evident that Hespcrocorixa Kirkaldy, 1908, and Anticorixa Jaczewski, 1924, are not only congeneric but that the group should be recognized as a generic group under the name Hesperocorixa Kirkaldy. Mr. Walton, in proposing to submerge all groups of Sigara under Corixa, argued that H. laevigata (Uhler) , a large dextral, smooth-appearing species of North America, bridges the gap between Corixa sens. str. and Anticorixa. The color pattern of H. laevigata (Uhler) is typ- ically that of Corixa sens. str. and in spite of its dextral males I would not hesitate to place it in Corixa sens. str. if it belongs there. However, while it is unique in certain particulars, it belongs with the Hesperocorixa and is not the connecting link that Walton thinks it is. Neither is Corixa mirandeUa Hutchinson, the smallest Corixa sens. str. which was described from Africa and which I mention on page 32. KEY TO HESPEROCORIXA KIRKALDY (American species) 1. Mesoepimeron at level of the scent gland osteole as broad as or broader than the lateral lobe of the prothorax 2 Mesoepimeron at level of the scent gland osteole plainly narrower than the lateral lobe of the prothorax 7 2. (1 ) Dorsal surface of hind femur armed with many spines 3 Dorsal surface of hind femur with only two or at the most three very stout spines h. minorella (Hungfd.) (p. 499) 3. (2) Mesoepimeron at level of osteole considerably broader than the lateral lolie of prothorax 4 Mesoepimeron at level of osteole about equal in width to the lateral lobe of prothorax H. atopodonta (Hungfd.) (p. 602) 4. (3) 7.5 mm. long or less 5 8 mm. long or more C 5. (4) Corial pattern crossbanded H. michiganensis (Hungfd.) (p. 506) Corial pattern in longitudinal series H. semilucida (Walley) (p. 508) 6. (4) Hemelytra but slightly rastrate; orange to red with large black spot on base of clavus and on distal portion of corium. Male pala not longitudinally carinat,e on outer surface, appearing thin in dorsal view..//, brimleyi (Kirk.) (p. 510) Hemelytra rather strongly rastrate; clavus and corium either solid black or else with pale crossbands, never with spots. Male pala longitudinally carinate on outer surface, appearing thickened in dorsal view....//, kennicottii (Uhl.) (p. 512) Western Hemisphere Corixidae 499 7. (1) Lateral lobe of prothorax narrow, plainly longer than wide; smaller species, less than 8 mm. long H. minor (Abbt.) (p. 514) Lateral lobe of prothorax broader; species more than 8 mm. long 8 8. (7) Color pattern normal 9 Color pattern in part effaced, at least on corium H. lucida (Abbt.) (p. 517) 9. (8) Pronotal disk more than half as long as wide 10 Pronotal disk less than half as wide as long H. escheri (Heer) (^ scabricida Walley) (p. 519) 10. (9) Pattern of hemelytra reticulate; surface of pronotum nonrastrate. H. laevigata (Uhler) (p. 621) Hemelytral pattern not reticulate; surface of pronotum from faintly to strongly rastrate ' •' '■^ 11. (10) Pale bands of corium beyond hemelytral suture forming slender transverse series. Corium and membrane not plainly separated 12 Pale bands of corium beyond hemelytral suture not forming slender transverse series ; or, if so, then corium and membrane plainly separated 13 12. (11) Vertex produced in both sexes H. harrmi (Uhl.) . (p. 528) Vertex not produced in either sex H. vulgaris (Hungfd.) (p. 530) 13. (11) Clavus rastrate only along hemelytral suture, corium very finely rastrate; pro- notum with a median longitudinal pale line on distal half; male structures as on Plate LXXX H. georgiensis (Egbert) (p. 537) Clavus rastrate all over ; corium not finely rastrate 14 14. (13) Hind femur with a row of about 10 spines ventrally on distal portion of rear margin H. nitida (Fieb.) (p. 539) Hind femur with a row of about 6 spines ventrally on distal portion of rear margin 15 15. (14) Short, rather stout species, more than one-third as wide as long; hemelytra heavily rastrate, middle femora stout and spinose H. martini (Hungfd.) (p. 542) Species about one-third as wide as long; not so heavily rastrate; middle femora not stout and spinose 1 ^ 16. (15) Corium and membrane plainly separated, often by a pale line; upper distal angle of male pala not acutely, obliquely produced 1" Corium and membrane not plainly separated ; upper distal angle of male pala acutely, obliquely produced H. obliqua (Hungfd.) (p. 543) 17. (16) Interocular space almost equal to the width of an eye; metaxyphus as broad as long; strigil of male not unusually long H. lohata (Hungfd.) (p. 546) Interocular space considerably narrower than the width of an eye; metaxyphus longer than broad; strigil of male very long H. interrupta (Say) (p. 548) Hesperocorixa minorella (Hungerford) (Plate LXXX, figs. 7, 7a-7b) 1926. Arctocorixa viinorella Hungerford, H. B. Bull. Brooklyn Ent. Soc, XXI, p. 197, PI. XIII, figs. 10, 12 (desc. from Douglas L., Mich.). 1930. Arctocorixa minorella. Walley, G. S. Can. Ent. LXII, p. 281 (records Quebec). 1932. Arctocorixa minorella, Walley, G. S. Can. Ent. LXIV, p. 153 (records N. .shore Gulf St. Lawrence, etc.). 1936. Arctocorixa minorella, Walley, G. S. Can. Ent. LXVIII, p. 60 (records Ontario). 1936. Sigara {Anticorixa) minorella, Jaczewski, T. Proc. Royal Ent. Soc. London, V., Pt. 2, Ser. B, p. 43. 500 The University Science Bulletin Size: Length 6.3 mm. to 7.1 mm. Width of head across eyes 2 mm. to 2.4 mm. Color: General facies dark. Pronotmn with about 7 rather ob- scured irregular dark bands. Clavus with dark bands regular at base but broken and irregular distally. Corium with pattern in transverse series but broken and irregular throughout; tip of corium pale. Membrane smoky brown with suffused pale markings. Em- bolium smoky black in darker specimens. Venter black in dark males. Limbs yellow to smoky black; head yellow. Structural characteristics: Head about half the length of pronotal disk; vertex rounded; facial hairs few; male fovea shallow, not at- taining eyes laterally. Antennal segmentation: 1 : 2 : 3 : 4 : : 21 : 15 : 39 : 30 ^ ; 1 : 2 : 3 : 4 : : 21 : 15 : 40 : 32 $ . Pronotal disk with median carina showing faintly on anterior margin; somewhat pointed at ajiex. Pronotum and hemelytra strongly rastrate, mem- brane shining. A few long, pale hairs on hemelytra. Lateral lobe of prothorax considerably longer than broad, quadrate, anterior apical angle slightly produced. Mesoepimcron rather broad, but with osteole of scent gland nearer to tip than to lateral emargina- tion. Mesosternum slightly medianly produced behind, but not bi- dentate. Metaxyphus considerably longer than broad. Front leg of male: pala with sides nearly parallel, apex bluntly rounded, with 22 to 24 teeth, somewhat crowded distally, basal ca- rina not prominent; tibia with short dorsal carina bearing tuft of about 4 spines distally; femur slender, with patch of about 7 rows of stridulatory pegs on inner surface near center. Middle and hind legs slender, the segmental proportions as follows: Middle leg: fe- mur : tibia : tarsus : claw :: 100 : 41.3 : 33.4 : 33.4. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 87.5 : 112.5 : 35. Male asymmetry dextral. Strigil of moderate size, subovate, of about 7 regular combs. Right elasper of male genital capsule enlarged at tip as in Plate LXXX, fig. 7. Male pala and abdomen as in Plate LXXX, figs. 7a and 7b. Flaps of penial sheath large and of irreg- ular shape. Comparative notes: This species can be distinguished from other Hesperocorixa by the long, slender prothoracic lobe and the long, slender metaxyphus. Location of types: Described from 20 specimens from Bryant's Bog and Mud Lake, Douglas Lake region, Michigan. Holotype, al- lotype and paratypes in Francis Huntington Snow Collections, Uni- versity of Kansas. Western Hemisphere Corixidae 501 Data on distribution: (Plate LXXXIII.) Published records are Michigan in U. S. A. and Quebec and Ontario, Canada. We have before us the following: Canada: Newfoimdland: Lewisport, July-August, 1905, L. P. Gratacap (A. M. N. H.), 1 female. Ontario: Cranberry Creek, Algonquin Park, April 1, 1936, R. D. C. Martin, 2 males, 1 female (record by G. S. Walley) ; Ottawa, July 26, 1913, J. I. Beaulne; Trenton, at light, July 19, 1901, Evans (Can. Coll.) ; Thunder Bay Beach, July 29, 1939, H. S. Parish (Lutz) ; same place and collector, Aug. 9, 1940 (Lutz) ; same place and collector, July 9, 1941 (Lutz). Manitoba: Winnepeg. June 12, 1910, J. B. Wallis (Wallis Coll.), 2 males. U. S. A.: Maine: Peak's Island, July 31, 1937, G. A. Moore; same place and collector, Aug. 8, 1937; same place and collector, Aug. 27, 1937. New Hampshire: Hampton, April 18, 1922, S. Albert Shaw, 1 male, 1 female. Connecticut: Cockaponsett, St. Forest, G. E. Pickford (Hutchin- son Coll., Yale) ; Pachang, July 19, 1942, G. E. Pickford (Hutchinson Coll., Yale). Michigan: Douglas Lake, Bryant's Bog, Aug. 17, 1923, H. B. Hungerford, 2 males, 3 females; same place and collector, Aug. 12, 1925, 12 males, 12 females; same place and collector, July 24, 1925, 5 males, 7 females; same place and collector, July 17, 1923, 2 males, 3 females; same place and collector, July 29, 1923, 3 males, 2 fe- males; same place and collector, Aug. 1, 1923, 9 males, 6 females; same place and collector, July 11, 1930, 3 males, 3 females; Douglas Lake, Vincent Lake, July 23, 1923, H. B. Hungerford, 1 female; Douglas Lake, Bessey Creek, July 18, 1923, H. B. Hungerford, 1 female; Douglas Lake, Trout Creek, Aug. 9, 1923, H. B. Hungerford, 1 male, 4 females; Douglas Lake, Smith's Bog, June 11, 1923, H. B. Hungerford, 3 males, 10 females; Mud Lake, July 31, 1923, H. B. Hungerford, 4 males, 14 females; North Michigan, Aug. 23, 1930, H. B. Hungerford, 1 female; Cheboygan Co., July 5, 1918, R. F. Hussey (Hussey Coll.), 8 males, 4 females; Charlevoix Co., Beaver Island, Sept. 6, 1922, R. F. Hussey (Hussey Coll.), 1 male. Wisconsin: Brule, Aug. 16, 1937, C. L. Johnston, 1 male; Wiscon- sin (C. F. Baker in U. S. N. M.). Minnesota: Two Harbors. Aug. 9, 1922, H. B. Hungerford, 1 male. 502 The University Science Bulletin 3 females; Carlson, Aug. 8, 1922, H. B. Hungerford, 4 males, 1 fe- male; Itasca Park, Aug. 21, 1922, H. B. Hungerford, 4 males, 8 fe- males; Lake Isabella River, Aug. 14, 1922, H. B. Hungerford, 1 female; Minneapolis, Univ. campus pool, Aug. 17, 1921, Hoffmann (Minn. Coll.), 1 male, 1 female. Kansas: Riley Co., from student collection, 1 male, 1 female. Hesperocorixa atopodonta (Hungerford) (Plate LXXX, figs. 2, 2a-2b) 1916. Arctocorisa dubia Abbott, J. F. Ent. News, XXVII, p. 342. 1917. Arctocorisa dubia, Parshley, H. M. Dec. Papers of Boston Soc. of Nat. Hist., VII, p. 117. 1926. Arctocorixa dubia, Blatchley, W. S. Heteroptera of Eastern North America, pp. 1069, 1072. 1927. Arctocorixa atopodoiita Hungerford, H. B. Bull. Brooklyn Ent. Soc, XXII, p. 35. (New name for A. dubia Abbott with additional descriptive note and distribution record.) 1928. Arctocorixa dubia. Torre-Bueno, J. R. de la. A List of tlie Insects of New York, Cornell U. Agri. Exp. Sta. Memoir 101, p. 141. 1929. Sigara (,A7iticorixa) atopodonta, Lundblad, O. Entoniologisk Tidskrift, L, Haft 1, pp. 29-33, figs. 8, 9a-k, Taf. Ill, fig. 4. 1930. Arctocorixa atopodonta, Walley, G. S. Can. Ent., LXII, p. 280. 1932. Arctocorixa atopodonta, Ricker, Wm. E. Univ. of Toronto Press Biol. Series No. 36, p. 88 (in stomach of speckled trout). 1936. Sigara (Anticorixa) atopodonta, Jaczewski, T. Proc. Roy. Ent. Soc. Lend., B, Vol. 5, Pt. 2, p. 43. 1936. Arctocorixa atopodonta, Walley, G. S. Can. Ent., Vol. LXVIII, p. 60. 1938. Arctocorixa dubia, Brimley, C. S. Insects of North Carolina, p. 84. Size: Length from 8.3 mm. to 9.6 mm. Width of head across eyes from 2.6 mm. to 2.9 mm. Color: General facies chestnut brown. Pronotum crossed by 8 to 9 rather broad lines, usually straight and unbroken. Lines of clavus, corium and membrane uniformly coalescent to form a dark background with narrow flecks of light straw color. Posterior angle of corium conspicuously bordered by V-shaped yellow band which separates corium from membrane. Embolium yellowish white. Limbs and venter straw yellow. Structural characteristics: Head slightly less than half the length of pronotal disk, facial hairs few, vertex not produced. Male fovea very shallow, not reaching middle of eyes. Antennal segments: 1 : 2 : 3 : 4 : : 28 : 22 : 52 : 34 (^ ; 1 : 2 : 3 : 4 : : 30 : 21 : 60 : 38 2 ■ Pronotum slightly pointed at apex; carina very short, hardly noticeable; strongly rastrate. Hemelytra rastrate, with a few pale hairs. Pruinose area of embolar groove posterior to nodal furrow about one-third the length of the embolium. Lateral lobe of prothorax quadrate, slightly rounded at apex. Mesoepimeron mod- erately broad; scent gland osteole about half way between tip and Western Hemisphere Corixidae 503 lateral cmargination; mesosternum not medianly produced behind. Metaxyphus arrow-shaped; no longer than broad. Front leg of male: pala oblong, cultrate; pegs about 27, crowded toward distal end, and with one larger peg standing out of line, apart from rest, at distal end of row; basal carina large, prominent; tibia with pronounced dorsal carina bearing stout spine at distal end; femur rather stout, oblong, with no stridulatory pegs at base. Middle and hind legs slender, the relation of segment to segment be- ing as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 42.7 : 32.9 : 32.9; hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 94 : 120 : 40. Male asymmetry dextral; strigil of moderate size, longer than broad, composed of six regular combs. For details of male structures see Plate LXXX, figs. 2, 2a, and 2b. Comparative notes: The peg which stands away from the rest on the male pala readily distinguishes this species from all other Hes- perocorixa except the European H. parallela (Fieber). Location of type: Described from one male holotype from Peru, Mass., in the Parshley collection. This specimen, labeled "Peru, Mass.,"Vni-27-1904" and "Holotype Arctocorixa dubia Abbott", is, through the kindness of Doctor H. M. Parshley, now in the Fran- cis Huntington Snow Collections, University of Kansas. Data on distribution: (Plate LXXXIV.) The published records are: Massachusetts, Maine, New York, Minnesota, Michigan, Kan- sas, Colorado, and Ontario, Canada. We have studied the follow- ing: Canada: Nova Scotia: Truro, August, 1913, R. Matheson (Cor- nell), 2 males, 6 females. Ontario: Toronto, March 21, 1931, E. C. Oakley (Lutz) ; Guelph, August 3, 1931, W. H. G. Patton (H. G. Barber), 1 male, 1 female; Ottawa, July 28, 1913, J. I. Beaulne; Ottawa, W. Simpson; Trenton, at light, Evans; Thunder Bay Beach, July 9, 1941, H. S. Parish. Manitoba: Cowan, March 7, 1937, C. L. Johnston, 1 female; Red Deer R., August 3, 1937, R. H. Beamer, 1 female. U. S. A.: Maine: Peak's Isld., August 7, 1937; Orono, May 1, 1912, H. M. Parshley, 2 males. New Hampshire: Durham, October 2, 1901, Osborne, 1 male, 2 females; Hampton, April 18, 1922, S. Albert Shaw. Massachusetts: Milton, March 26, 1922, W. Clench, 5 males, 2 fe- males; Peru, August 27, 1904 (Parshley Coll.) 2 males; Washing- ton, August 8, 1912 (Parshley) ; Melrose High, April 1, D. H. Clem- 504 The University Science Bllletin ons, 1 male; Northampton, September 31, 1917, H. M. Parshley, 3 males, 6 females; same place, September 19, 1919, Priscilla Butler, 3 males, 6 females; Peru, August 24, 1904, 2 males; Forest Hills, May 4, 1915 (Parshley). Connecticut: Wmdham Co., Aug. 11, 1927, C. L. Hubbs (Mich. Coll.), 1 male, 2 females; New Haven, June 27, 1911, A. B. Cham- plain, 3 females; same place, Aug. 22, 1913, B. H. Walden (Parsh- ley) ; Hartford, April 14, 1914, 1 male; Natchang, St. Forest, Aug. 21, 1942. G. E. Pickford (Hutchinson). Rhode Island: Providence, Sept. 3, Davis (Parshley). New Jersey: Ramsey, July 7, 1912, 2 males, 3 females; Passiac Co., Aug. 19, 1927, Hubbs and Breder (Mich. Coll.), 1 female. New York: Ithaca, P. W. Claassen, 1 male, 1 female; Ithaca, H. B. Hungerford, 1 male; Ithaca, Aug. 26, 1891, 1 female; Ithaca, Sept. 15, 1917, E. C. Van Dyke (CaUf. Acad.). Pennsylvania: Barrens, Aug. 5, 1942, V. R. Haber, 4 males, 6 fe- males; Pine Grove Mills, July 22, 1942, V. R. Haber, 1 male. Ohio: Delaware, June 26, 1916, C. J. Drake (Drake) • Michigan: Berrien Co., 1 male, 3 females; Cheboygan Co., Aug. 19, 1918, R. H. Hussey, 4 males; same place, Douglas Lake, July 17, 1936, C. D. Lyman (Mich. Coll.), 1 male, 2 females; Douglas Lake, Trout Creek, Aug. 9, 1923, H. B. Hungerford, 1 female; Douglas Lake, Smith's Bog, June 11, 1923, H. B. Hungerford, 1 male, 1 fe- male; same place and collector, July 19, 1929, 2 males, 1 female; same place and collector, June 11, 1924, 40 males, 35 females; Douglas Lake, July 23, 1924, H. B. Hungerford, 19 males, 17 fe- males; Douglas Lake, July 17, 1924, H. B. Hungerford, 1 male; Cheboygan Co.. Aug. 7, 1930, H. B. Hungerford, 1 male; East Fish Tail Pool, Doug. L., July 6, 1923, H. B. Hungerford, 1 male; Mud Lake, Doug. L., July 31, 1923, H. B. Hungerford, 2 males; Sedge Point Pool, Doug. L., July 17, 1923, H. B. Hungerford, 3 females; same place and collector, June 30, 1923, 1 female; Bryant's Bog, Douglas L., July 12, 1924, H. B. Hungerford, 1 female; Burt Lake, July 7, 1923, H. B. Hungerford, 3 males, 2 females; Bois Blanc Island, Aug. 11, 1932, H. B. Hungerford, 1 male, 1 female; Wash- tenaw Co., Ajml 19, 1919, R. H. Hussey, 4 males, 2 females; same place, April 25, 1933 (Mich. Coll.), 1 male, 1 female; same place, Ann Arbor, 1918. F. M. Gaige (Mich. Coll.), 4 males, 7 females; Ann Arbor, Miss Haynes (Mich. Coll.), 2 males, 7 females; same place, June, 1921, R. H. Hussey, 5 males, 2 females; Battle Creek, Western Hemisphere Corixidae 505 Aug. 23, 1920, Priscilla Butler, 1 male; same place, Sept. 22, 1920, Priscilla Butler (Hussey Coll.), 3 males, 9 females; Livingston Co., Aug. 10, 1919, R. H. Hussey, 1 male; Pentwater, July 17, 1916, E. Liljeblad (Field Mus. Coll.). 2 males, 2 females; Huron Mt. Club, L. Superior, June, 1911 (Barber Coll.), 1 female; Muskegon Drain, Mecosta Co., May 10, 1925, J. Metzelaar, 1 female (Mich.) ; Taqua- menun R., Luce Co., May 20, 1925, J. Metzelaar, 1 female (Mich.) ; Leighton Swamp, Allegan Co., March 10, 1925, J. Metzelaar (Mich.), 1 female. Wisconsm: Polk Co., Avery, Sept. 19, 1928, E. P. Creaser (Mich. Coll.), 1 female; Rush Co., Sept. 1, 1930, Creaser and Jones (Mich. Coll.), 1 female; Rayfield Co., Aug. 2, 1928, Creaser and Jones (Mich. Coll.), 2 females; Wisconsin, C. F. Baker (U. S.N. M.), 1 female; Wisconsin (K. U. Coll.), 2 males, 1 female; Dane Co., Lake Wingra, March 16, 1930, E. P. Breakey, 6 males, 7 females; Brule, Aug. 16, 1937, R. H. Beamer, 1 male; same place and date, C. L. Johnston, 1 female; Sauk Co., Baraboo R., Aug. 31, 1927, Creaser, Stewart and Griffith (Mich.), 2 females; St. Croix R., Aug. 17, 1928, Schultz and Tarzwell (Mich.), 3 females; Fond du Lac, Grand River, Fairwater, Aug. 28. 1925, Greene and Jones (Mich.), 1 male, 1 female. Minnesota: Minneapolis, April 20, 1927, R. A. Vickery (U. S. N. M.), 4 females; same place, 1919, R. H. Hussey (Hussey), 2 males; St. Paul, June 29, 1931, A. A. Granovsky, 1 female; St. Louis Co., Aug. 14, 1922, H. B. Hungerford, 2 females; Grand Mar- ais, Aug. 13, 1922, H. B. Hungerford, 1 female; Becker Co., Aug. 22, 1922, H. B. Hungerford, 1 male, 1 female; L. Isabella R., Aug. 18, 1922, H. B. Hungerford, 1 male; Carlson, Aug. 8, 1922, H. B. Hungerford, 1 male, 2 females; Cooley, Aug. 13, 1937, H. T. Peters, 1 male; Eveleth, Aug. 13, 1937, C. L. Johnston, 1 male; Hibbing, Aug. 18, 1922, H. B. Hungerford, 1 female; Minnesota, H. B. Hun- gerford, 2 males, 7 females; Olivia, June 28, 1921, H. H. Knight (Minn.), 21 males, 17 females; St. Paul, June 25, 1921, W. E. Hoff- mann (Minn.), 1 male, 2 females. North Dakota: Hillsboro, July 26, 1937, R. H. Beamer, 1 male. Colorado: Pingree Park, Aug. 20, 1924, Beamer and Lawson, 25 males, 113 females. Montana: Three Forks, July 22, 1931, L. D. Anderson, 1 male. Washington: Yelm, Thurston Co., permanent pond, Jan. 15, 1947, E. P. Breakey and son, 1 male. 506 The University Science Bulletin Hesperocorixa michiganensis (Hunger ford) (Plate LXXX, figs. 6, 6a-6b) 1926. Arctocorixa michiganensis Hungerford, H. B. Bull. Brooklyn Ent. Soc, XXI, pp. 197-198, PI. XIII, fig. 15 (desc. from Mich.). 1930. Arctocorixa michiganevsis, Walley, G. S. Can. Ent. LXII, p. 281 (records Quebec, Canada). 1936. Arctocorixa michiganensis, Walley, G. S. Can. Ent. LXVIII, p. 60 (records British Columbia, Canada). 1936. Sigaira (Anticorixa) michiganensis, Jaczewski, T. Proc. Royal Ent. Soc. London, v., Pt. 2, Ser. B, p. 43. Size: Length 6.3 mm. to 7.2 mm. Width of head across eyes 2.1 mm. to 2.3 mm. Color: General facies medium brown. Pronotum with about 7 dark bands of which posterior ones are somewhat broken and irregu- lar. Dark markings of clavus and corium wavy and irregular in appearance. Membrane smoky-brown, covered with irregular pale blotches; separation from corium indistinctly marked by pale brown line. Limbs and thorax yellow, abdominal venter brownish. Em- bolium silvery-white. Structural characteristics: Head about half as long as pronotal disk, vertex rounded; facial hairs few; male fovea very shallow, not attaining eyes laterally. Antennal segmentation as follows: 1:2: 3 : 4 : : 24 : 16 : 48 : 31 males; 1 : 2 : 3 : 4 : : 24 : 15 : 45 : 32 fe- males. Pronotum with faint indication of median carina on anterior margin ; apex somewhat pointed. Pronotum and hemelytra strongly rastrate, membrane shining. Hemelytra with numerous whitish hairs, especially on membrane. Lateral lobe of prothorax about half as broad as long and with anterior apical angle produced. Meso- epimcron broad, osteole located almost at lateral emargination. Metaxyphus as broad as long, arrow-shaped. Front leg of male: Pala rather short with sides nearly parallel, the apex bluntly rounded, peg row with about 22 teeth, basal carina prominent; tibia with short dorsal carina bearing tuft of 3 to 4 long spines distally. Femur moderately slender, without stridulatory pegs on inner surface. Middle and hind legs slender, the segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 36.6 : 28.6 : 38.2. Hind leg: femur : tibia : tarsus 1 : tar- sus 2 : : 100 : 92.2 : 115.2 : 43.5. Male asymmetry dextral. Strigil long and slender, with 5 somewhat irregular combs. For details of male structures see Plate LXXX, figs. 6, 6a and 6b. Comparative notes: This species can be distinguished by the an- terior apical angle of the prothoracic lobe being somewhat produced, Western Hemisphere Corixidae 507 by the broad mesoepimeron with the scent gland osteole near the lateral emargination, and by the broad rounded cap-like head fitting closely over a short rounded pronotum. Location of types: Holotype, allotype and some para types from the Douglas Lake, Michigan, region in the Francis Huntington Snow Collections, University of Kansas. Other paratypes in tFie Museum of Zoology, University of Michigan, Ann Arbor, Michigan. Data on distribution: (Plate LXXXIII.) The published records are Michigan, U. S. A., and Quebec and British Columbia, Canada. We have before us the following: Canada: Manitoba: Red Deer R., Aug. 3, 1937, C. L. Johnston, 10 males, 6 females; Oakner, July 31, 1937, C. L. Johnston, 2 males; Cowan, Aug. 7, 1937, C. L. Johnston, 1 male; Miami, June 27, 1916, J. B. Wallis (Wallis) , 1 female. Ontario: Merivale, April 16, 1931, G. S. Walley (record by Walley). U.S.A.: New Hampshire: Hermit Lake (Kirkaldy Coll.), 2 males, 2 females. Massachusetts: Forest Hills, Oct. 21, 1921, R. F. Hussey (Hussey Coll.), 1 female. New York: White Plains, Aug. 29, 1908, 1 male. Michigan: Chippewa Co., Whitefish Point, Aug. 27, 1913, T. L. Hankinson (Mich. Coll.), 1 male; Cheboygan, Aug. 15, 1928, Wesley Clanton (Mich. Coll.), 1 female; Cheboygan Co., July 9, 1918, R. F. Hussey (Hussey Coll.), 2 males, 9 females; Cheboygan Co., Aug. 7, 1930, H. B. Hungerford, 2 females; North Michigan, Aug. 23, 1930, H. B. Hungerford, 4 females; Topinabee (Cornell U. Coll.), 1 male, 4 females; Douglas Lake, 1 female; same place, July 10, 1927, H. B. Hungerford, 14 males, 18 females; same place and collector. Sedge Pool, June 30, 1923, H. B. Hungerford, 1 male; same place and col- lector, July 3, 1923, 1 female; same place and collector, July 13, 1923, 5 males, 2 females; same place and collector, July 17, 1923, 2 males, 1 female; same place and collector, Aug. 15, 1923, 42 males, 93 females; Douglas Lake, Bryant's Bog, July 17, 1923, H. B. Hungerford, 8 males, 5 females; same place and collector, Aug. 17, 1923, 3 males, 4 females; Douglas Lake, East Fish Tail Pool, July 6, 1923, H. B. Hungerford, 7 females; Douglas Lake, Smith's Bog, July 16, 1923, H. B. Hungerford, 2 males, 2 females; same place and collector, July 19, 1929, 6 males, 11 females; Douglas Lake, Bessey Creek, July 18, 1923, H. B. Hungerford, 1 female; Burt 508 The University Science Bulletin Lake, July 7, 1923, H. B. Hungerford, 12 females; Burt Lake, Fontenalis Run, July 7, 1923, H. B. Hungerford, 1 female; Che- boygan Co., July 29, 1918, P. Butler, 4 males, 3 females; Cheboygan Co., July 29, 1918, R. F. Hussey (Hussey Coll.), 6 males, 2 females; Montgomery Co., July, 1925, J. Metzelaar (Mich. Coll.), 1 male; Washtenaw Co., 1918, R. F. Hussey (Hussey Coll.), 2 females. Wisconsin: Brule, Aug. 16, 1937, C. L. Johnston, 3 males, 7 fe- males; Wisconsin, C. F. Baker, 2 females; Dane Co., April 19, 1930, E. P. Breakey, 1 male, 3 females. Minnesota: St. Paul, Oct. 8, 1918, R. F. Hussey (Hussey Coll.), 2 females; St. Paul, Elk's Golf Pond, June 5, 1921, Hoffmann (Minn. Coll.), 1 male; Hibbing, Aug. 18, 1922, H. B. Hungerford, 1 female; Cook Co., Beaver Dam, Aug. 12, 1922, H. B. Hungerford, 1 male, 2 females; Pine River, Big Trout Lake, Aug. 22, 1939, H. C. Severin (S. D. Coll.) ; same place and collector, Aug. 28, 1942, 3 males, 4 females. North Dakota: McVille, July 27, 1937, C. L. Johnston, 1 male; Turtle Mts., Aug. 3, 1920, T. H. Hubbell (Hubbell Coll.). 1 female. South Dakota: Weta, July 18, 1937, C. L. Johnston, 2 males, 1 female. Hesperocorixa semilucida (Walley) (Plate LXXIX. figs. 1, la-lc) 1930. Arctocorixa semibicida Walley, G S. Can. Ent. LXII. p. 284-285. Plate 21, figs. 3a, 3b, 3c, 3d. 1936. Sigaru (Anticorixa) .'e7nilucida, Jaczewski, T. Pme. Royal Ent. Soc. London, Ser. B, V, Pt. 2. p. 43. Size: Length 7 mm. to 7.5 mm. Width across eyes 2.35 mm. to 2.44 mm. Color: General facies dark, often suffused with red. Pronotum crossed by 7 to 9 brown bands. Background color varying from yellow to red on pronotum and hemelytra. Clavus and corium with brown pattern arranged in more or less longitudinal series. Mem- brane with obscure brown marks. Color pattern etched away along margins of clavus and corium. Embolium yellowish white. Head and limbs yellowish, the latter often suffused with red. Abdominal venter black with yellow to orange margins. Thorax yellow. Structural characteristics: Head slightly shorter than pronotal disk as seen from above; vertex not produced. Facial hairs few; male fovea shallow. Antennal segmentation: 1 : 2 : 3 : 4 : : 28 : 18 : 58 : 31 males; 1 : 2 : 3 : 4 : : 28 : 19 : 55 : 29 females. Pro- notal disk about twice as wide as long, rounded apically, with faint Western Hemisphere Corixidae 509 median carina visible on anterior fourth, faintly rastrate. Heme- lytra moderately rastrate, a few pale hairs on corium and membrane. Lateral lobe of prothorax obliquely truncate, the anterior apical angle slightly produced. Mesoepimeron broad with osteolc remote from tip. Pleural region laterally inflated. Metaxyphus slender and pointed, considerably longer than wide. Front leg of male: Pala subparallel-sided, the apex blunt, about 20 to 22 pegs, basal carina distinct. Tibia with short dorsal carina bearing tuft of about 3 hairs apically. Femur slender; no stridula- tory pegs. Middle leg: femur : tibia : tarsus : claw :: 100 : 40 : 30 : 30. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 87.5 : 112.5 : 42.5. Male asymmetiy dextral. Strigil oval, of about 5 regular combs. Tip of ninth segment of male without fluted edge. For details of male abdomen and genitalia see Plate LXXIX, figs. 1 and lb. Flaps of penial sheath large. Coinparative notes: This species differs from H. bnmleyi Kirk, and H. kennicottii (Uhler) in having a long, slender metaxyphus. Location of types: No. 3128 in the Canadian National Collection, Ottawa. Holotype male. Point Pelee, Ont., June 6, 1929 (Walley). Allotype, same data, and ten paratypes, females, same place, June 3-6, 1929 (Milne and Walley). One of these paratypes now in the Francis Huntington Snow Collections at the University of Kansas. Data on distribution: (Plate LXXXV.) Can.\da: Ontario: Point Pelee, June 6, 1929, Walley and Milne, type series; Prince Edw. Co., April 20, 1930, Brimley, 1 male (re- corded by G. S. Walley I . U. S. A.: Massachusetts: Northampton, Oct. 31, 1917, H. M. Parshley (Parshley Coll.), 2 males; Saugus, Aug. 2, 1917, H. M. Parshley (Parshley Coll.), 1 male; Massachusetts (Uhler Coll.), 1 male; Massachusetts, F. Blanchard, 1 male; Massachusetts (Uhler), 1 female; Wellesley, A. P. Moore, 1 male, 1 female. New York: Staten Island (Wash. U. Coll.), 1 male; Syracuse, Oct. 3, 1 male. Neio Jersey: Lakeway, Aug., 1920, J. W. Angell, 1 female; Great Piece, May 2, 4 males, 1 female; Milburn, April 30, 1 male; Pater- son, June, 1923, 1 female; Trenton, Oct. 3, 2 males, 1 female. Delaware: Lewis, 1913, H. W. Fowler, 2 females. North Carolina: Raleigh, January, 2 males; Raleigh, April 12, 1906, C. S. Brimley (Brimley Coll.), 1 male; Raleigh, January, 1 male. 510 The University Science Bulletin Florida: Agricultural Exp. Sta., Gainesville (Fla. Ag. Exp. Sta. Coll.), 1 female. Louisiana: C. F. Baker (Baker Coll.), 1 male, 1 female. Tennessee: Obion Co., Reelfoot Lake, June 24, 1931, Crcaser and Delavan (Mich.), 4 males, 16 females. Illinois: Illinois (Uhler), 1 male. Michigan: Washtenaw Co., May 14, 1933, 1 male, 1 female; Washtenaw Co., Ann Arbor, Oct. 18, 1916, F. M. Gaige, 2 males, 1 female. Hesperocorixa brimleyi (Kirkaldy) (Plate Vll, Plate LXXIX, figs. 2, 2a-2d) 190S. Arctocorisa (Hesperocorixa) brimleyi Kirkaldy, G. W. Can. Ent. XL, p. 120 (desc. from N. Carolina). 1909. Arctocorisa brimleyi, Kirkaldy, G. W., mid Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 194. 1917. Arctocorixa (Hesperocorixa) brimleyi, \an Duzee, E. P. Catalogue of Hemiptera of America North of Mexico, p. 485. 1926. Hesperocorixa brimleyi, Blatchley, W^. S. Heteroptera of Eastern North America, p. 1081. 1928. Hesperocorixa brimleyi, Hungerford, H. B. Annals Ent. Soc. Amer. XXI, p. 140, PI. yill, figs. 1, 3. 1928. Arctocorixa brimleyi, Hungerford, H. B. Ent. News, XXXIX, p. 156 (records from Baker Co., Ga.). 1938. Hesperocorixa brimleyi, Brimley. C. S. Insects of North Carolina, p. 84. 1940. Corixa (Hesperocorixa) brimleyi, Hutchinson, G. E. Trans. Conn. Acad. Arts and Sci. XXXIII, p. 413. Size: Length 8.2 mm. to 8.8 mm. Width across eyes 2.4 mm. to 2.9 mm. Color: General facies reddish orange. Pronotum without cross bandings. Basal third of clavus black, the other two-thirds reddish orange without markings. Corium reddish orange without markings apically, but with diagonal black band beyond claval tip. Distal angle of corium reddish orange, membrane also reddish orange. Embolium smoky. Head and vertex medium to dark brown, beak black, limbs usually suffused with bright red. Structural characteristics: Head equal to or slightly longer than pronotal disk, vertex conically produced in both sexes. Facial hairs few. Fovea of male very shallow. Antennal segmentation as fol- lows: 1 : 2 : 3 : 4 :: 28 : 20 : 50 : 34 (J ; 1 : 2 : 3 : 4 :: 28 : 22 : 64 : 32 5 . Pronotal disk about half as long as wide, usually with a very faint median carina on anterior third, apex rounded. Hemelytra and pronotum but slightly rastrate or faintly rugulose. A few pale hairs on hemelytra. Lateral lobe of prothorax obliquely truncate, the anterior apical Western Hemisphere Corixidae 511 angle produced. Mesoepimeron broad with osteole remote from tip. Pleural region laterally inflated. Metaxyphus pointed, no longer than broad. Front leg of male: pala subparallel-sided, long, about 28 palar pegs. Basal carina, if present, indistinct. See fig. 2, Plate LXXIX. Pala not longitudinally carinate on outer surface, appear- ing thin in dorsal view. Tibia with dorsal ridge, bearing a spini- form tuft of about 5 hairs distally. Femur moderately broad, with- out stridulatory pegs on inner basal surface. Middle and hind legs slender, the relation of segment to segment as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 35.5 : 28.9 : 33.3. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 90 : 122 : 44. Male asymmetry dextral. Strigil suboval, of about 5 fairly regular combs. The tip of the ninth segment or the male geni- tal capsule with a fluted edge. For details of male abdomen and genitalia see Plate LXXIX, figs. 2 and 2b. Flaps of penial sheath large. Comparative notes: This species differs from H. semilucida (Walley) in having a short, blunt metaxyphus and from H. kenni- cottii Kirk, in being orange or red with a large black spot on the base of the clavus and on the distal portion of the corium. Other differences are structural; its first tarsal segment of hind leg is broader, the strigil smaller and the tip of the ninth segment (genital capsule) of different shape. The pala is not thickened as seen in dorsal view. Location of types: A series of eight specimens, 3 males, 5 females, were located by me in the remnants of the Kirkaldy collection and are now in the Francis Huntington Snow Collection of the Univer- sity of Kansas. One specimen was labeled Raleigh, North Carolina, and two were labeled by Kirkaldy Hesperocorixa bnmleyi. I have selected a male as a lectoholotype and a female as a lectoallotype. The others I have labeled cotypes. Data on distribution: (Plate LXXXV.) Neio Jersey: lona, July 7, 1938, J. C. Lutz (Lutz Coll.), 1 male, 2 females. North Carolina: Raleigh, Jan., 1905, C. S. Brimley, 2 males, 3 females. Georgia: Baker Co., Oct. 23, 1927, C. H. Martin, 1 male, 1 fe- male; Okefenokee Swamp, Aug. 3, 1934, A. P. McKinstry, 20 males, 13 females; Tomb's Co., 7 mi. so of Lyons, Sept. 7, 1929, E. Creaser (Mich. Coll.), 1 female. Alaba^im: Palmer Pond, March 13, 1939, R. Christenson. 512 The University Science Bulletin Hesperocorixa kennicottii (Uhler) (Plate LXXIX, figs. 3, 3a-3d) 1897. Coriia kennicottii Uhler, P. R. Trans. Maryland Acad. Sci. (Baltimore) I, p. 393- 394 (in coastal region and vicinity of Chicago). 1909. Arctocoriaa kennicottii, Kirkaldy, G. W., and Torre-Bueno, J. R, de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 195. 1914. Corixa kennicottii, Parshley, H. M. Psyche XXI, p. 140 (record from Maine). 1917. Arctocorixa kennicottii, Van Duzee, E. P. Catalogue of Hemiptera of Amer. North of Mex., p. 481. 1917. Arctocorisa kennicotti, Parshley, H. M. Occasional Papers of the Boston Soc. of Nat. Hist., VII, p. 117. 1923. Arctocorim kennicottii, Abbott, J. F., in Guide to the Insects of Connecticut, Pt. IV, The Hemiptera or Sucking Insects of Connecticut, pp. 387-389, fig. 36 (2) and (7). 1926. Arctocorixa kennicottii, Blatchley, W. S. Heteroptera of Eastern Xorth America, pp. 1069-1072, figs. 2 and 7. 1928. Arctoco7-ixa kennicottii, Hungerford, H. B. Annals Ent. Soc. Amer. XXI, p. 140, PI. VIII, figs. 2, 4 and 6 (belongs under Hesperocorixa). 1028. Arctocorijra kennicottii, Torre-Bueno, J. R. de la, in Cornell Uni\-. .Agri. Exji. Sta. Memoir 101, A list of the Insects of New York. p. 141. 1930. Arctocorixa kennicottii, Walley, G. S. Can. Ent. LXII, p. 280 (records from On- tario and Quebec, Canada). 1936. Sigara (Anticorixa) kennicottii, Jaczewski. T. Proc. Rtiyal Ent. Soc. London, Ser. B, V, Pt. 2, p. 42. 1940. Corixa (Hesperocorixa) kennicottii. Hutchinson, G. E. Trans. Conn. Acad. Arts and Sci., XXXIII, p. 413, figs. 397-405. 1943. Hesperocorixa kennicottii, Walton, G. A. Trans. Soc. for British Entomology VIII, Pt. 5, p. 161 (Places in Corixa). 1946. Arctocorixa kennicottii. Proctor, Win. Biol. Sur. of Mt. Desert Region Inc., Pt. VII, the Insect Fauna, p. 83 (records estuary of Gt. Heath, Mount Desert Isl.). Size: Length 8 mm. to 8.8 mm. Width across eyes 2.5 mm. to 2.8 mm. Color: Pattern variable. Pronotum may be crossed by seven or eight brown bands or it may be golden brown without crossbands or with faint ones. The clavus may have wavy dark markings inter- spersed with yellow or the dark figures may be completely coales- cent into a solid black field, margins of clavus yellow or golden brown. Corium may have the dark figures in more or less regular transverse series or the figures may be fused into a solid black field, the margins yellow or golden brown. Embolium and membrane pale yellow to golden brown. Head, limbs and thorax yellow to golden brown, hind legs sometimes suffused with red. Abdominal venter black with yellow to golden brown margins. Structural characteristics: Head as long as pronotal disk, eyes rounded, vertex produced in both sexes. Facial hairs few. Face of male flattened but without or with a very faint impression. Anten- nal segmentation: 1 : 2 : 3 : 4 : : 22 : 20 : 50 : 30 j ; 1 : 2 : 3 : 4 : : 23 : 20 : 50 : 31 $ . In many specimens the first and third antennal segments are relatively longer. Pronotal disk about half as long as wide, with faint indication of median carina on anterior Western Hemisphere Corixidae 313 fourth, faintly rastratc, rounded at apex. Hemelytra rastrate, with a few pale hairs, especially on membrane. Lateral lobe of pro- thorax obliquely truncate, the anterior apical angle slightly pro- duced. Mesoepimeron broad with osteole remote from tip. Thorax laterally inflated. Metaxyphus as broad as long, apex pointed. Front leg of male: pala subparallel-sidcd, rounded apically. with about 28 palar pegs. Pala longitudinally carinate on outer sur- face, appearing thickened as seen in dorsal view. A faint carina visible dorsally at the base. Tibia with a short dorsal ridge bearing a tuft of about 3 hairs apically. Femur not stout and without stridulatory pegs on inner basal surface. Middle and hind legs long and slender, the relation of segment to segment as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 36 : 32.6 : 36. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 92 : 110 : 40. Male asymmetry dextnll. Strigil suboval, of about 8 fairly regular combs. Tip of ninth segment of male (genital capsule) with a fluted edge. For details of male al)domen and genitalia see Plate LXXIX, figs. 3 and 3b. Flaps of penial sheath large. Comparative notes: This species differs from H. brimleyi m color pattern and certain structural characters and from H. semilucirla in having the metaxyphus no longer than broad. Location of types: Four specimens in the Uhlcr Collection at the U. S. National IMuseum: 3 males from "Pennamaquan R., Me. June 10, 1893 W. C. Kendall, collector." 1 male "Mass." P. R. Uhler collection, which lacks the pronotal lines and has the solid black fields on clavus and corium as is the case of one of the Maine speci- mens. I have selected one of the Maine specimens as lectoholotype and a female from Cambridge, Mass., as the allotype with the fol- lowing as parallotypes: 1 female, Cambridge, Mass.; 2 females, Holderness, N. H.; 2 females, Hamden, Ct. All of these females are associated with males. Data on distribution: (Plate LXXXV.) U. S. A.: Maine: Orono, April 21, 1900 (Uhler det.) ; Mount Desert Island, Sept. 1, 1942, W. Proctor, 1 male, 3 females; Penna- maquan River, June 10, 1893, W. C. Kendall, 2 males, 1 female. A'ew' Hampshire: Holderness, Aug. 3, 1889, 1 male, 2 females; Hampton, April 23, 1922, S. Albert Shaw; Durham. Massachusetts: Cambridge, 3 males. 2 females; Massachusetts (Parshley Coll.), 1 male; Northampton, Oct. 9, 1920, Louise Smith. 1 male, 1 female. 33-822 514 The University Science Bulletin Connecticut: Hamden, June 1, 1911, B. H. Walden (Parshley) (tlie^c labeled "paratype, A. lucida Abbott"). Xeii: York: Ithaca. Aug. 9, 1894, 3 males, 2 females; same place, July 17, 1917. H. B. Hungerford, 1 male, 4 females; Calverton. L. I., ]\Iay 27, 1923, Roy Latham, 1 female; Van Cortlandt Park, April 18, 1903 (Wash. U. Coll.), 4 males, 5 females; Van Cortlandt Park (Hussey), 2 females; Alontauk, L. I., June 7, 1931, Roy Latham, 1 male. Neiu Jersey: lona, July 22, 1941, J. C. Lutz (Lutz Coll.), 2 males, 1 female; lona, July 7, 1938, J. C. Lutz (Lutz Coll.), 1 male, 3 females; Trenton, Oct. 3 (Bueno Coll.), 2 males, 1 female; Riverton, Aug. 17, 1902, Van Duzee (Van Duzee) ; Trenton (Hussey). 4 females. Maryland: Crapo, May 20, 1916 (Lutz).. Washington, D. C: May 11, 1890, 1 male, 1 female. Virginia: Norfolk, :\Iay 11, 1928, G. E. Gould, 3 females. Ohio: Ira, Summit Co., Aug. 31, 1916, C. J. Drake (Drake i. Michigan: Nigger Creek, Mullett L. Michigan, July 30, 1925, H. B. Hungerford. 1 male; Cheboygan Co., Aug. 2, 1934, H. B. Hungerford, 3 females; Douglas Lake, 1927, H. B. Hungerford, 1 female; Douglas Lake. 1024, H. B. Hungerford, 1 male, 1 female; Washtenaw Co., Ann Arbor, Oct. 18, 1916, F. M. Gaige (ISIich. Coll.) , 2 males, 1 female; Vlichigan (Uhler Coll.), 1 female. Illinois: Algoncpiin, May 30, 1908, Nason, 1 male. Wisconsin: Brule, Aug. 16, 1937, C. L. Johnston, 1 male; Dane Co., May 24, 1914, Wm. S. Marshall, 1 female; Dane Co.. IVIarch 16, 1930, E. P. Breakey, 44 males, 74 females. Minnesota: Pelican Rapids, Aug. 22, 1922, H. B. Hungerford, 1 male; Shell L., Becker Co., Aug. 22, 1922, H. B. Hungerford, 1 male. Canada: Toronto, Ontario, March 21, 1931, E. C. Oakley (Lutz). Hesperocorixa minor (Abbott) (Plate LXXX, figs. 1, In-lb) 1913. Arctororisa nitida var. minor Abbott, J. F. Bull. Brooklyn Ent. Soc. VIII, p. 82 (desc. from Georgia). 1926. Arctocorixa tiilidn nihwr, Blatcliioj', W. .^. Hotoroptora nf Eastern \. A., pi^. lOfiS and 1070. 1920. Aatocorlia minor. Millspa\igh, Dick D. Field and Lab. VII. No. 2. |>. 8.') (Texas). 198S. Arctocorixa nitida minor, Brimley, C S. Insects of North Carolina, p. 84. l!)4r). Arctocorixa' nitida var. minor, Proetor, William. Biol. Surv. Mt. Desert Region Inc., Pt. VII. The Insect Fauna, p. 82 (recorded from Maine but not seen by me). Size: Length 7 mm. to 7.4 mm. Width of head across eyes 2.3 mm. to 2.4 mm. Western Hemisphere Corixidae 515 Color: General facies dark. Pronotum with about 8 fairly, regu- lar dark bands which tend to coalesce through central portion; pale lineations fine, somewhat zigzag, lines. Corium with dark and pale lines in fairly regular series anteriorly; beyond' claval suture the dark pattern tending to coalesce along mesal margin and at end of embolar groove; outer apical angle of corium with V-shaped pale area. Membrane with somewhat lighter pattern anteriorly, but smoky at apex. Rather indistinctly separated from corium by fusion of pale lineations. Embolium smoky. Head, limbs and venter yel- low. Structural characteristics: Head not quite half as long as pronotal disk; vertex rounded; facial hairs few; male fovea very shallow, not attaining eyes laterally. Antennal segmentation: 1:2:3:4:: 25 : 15 : 50 : 28 males; 1 : 2 : 3 : 4 : : 28 : 16 : 50 : 30 females. Pronotal disk with faint indication of median carina on anterior margin; apex somewhat pointed. Pronotum and hemelytra finely rastrate, membrane shining. Hemelytra with a few long, pale hairs. Lateral lobe of prothorax a little longer than broad; quadrate; apex almost straight. Mesoepimeron narrow, the osteole near the tip. Metaxyphus arrow-shaped; small; no longer than broad. Front leg of male: Pala long and slender, sides nearly parallel, apex bluntly rounded, with about 20 to 22 teeth, basal carina not prominent; tibia with dorsal carina bearing tuft of about 3 or 4 long spines distally; femur slender, without patch of stridulatory teeth on inner surface. Middle and hind legs slender, the segmental pro- portions as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 40.5 : 32.9 : 40.5; hind leg: femur : tibia : tarsus 1 : tar- sus 2 : : 100 : 89.3 : 119.6 : 48.8. Male asymmetry dextral. Strigil of moderate size with 6 regular combs. For details of male struc- tures see Plate LXXX, figs. 1 to lb. Nomenclatorial notes: Although this species was named as a va- riety of H. nitida (Fieb.), our studies of the two indicate that they are distinct species. Comparative notes: In this species the mesosternum is medianly produced behind, but is not bidentate. It differs from minor ella (Hungfd.l in having a narrow mesoepimeron with the osteole near the tip. Location oj types: Cornell University, Ithaca, New York. Holo- type a male labeled "Gainesville, Ga., April 2, 1911, coll. by J. C. Bradley." Paratype female, "Marietta, Ga., March 5, 1911, J. G. Bradley"; paratype female, "Athens, Ga., J. C. Bradley." • 516 The University Science Bulletin Data 071 distribution: (Plate LXXXIII.) Described from Georgia and recorded from Massachusetts and Nortli Carolina. The Maine record needs verification. We have seen the following: U.S.A.: Massachusetts: (Uhler Coll.), 2 females. New York: Cold Springs Harbor. Aug. 18, 1920. H. M. Parshley (Parshley Coll.), 1 male, 2 females. Rhode Island: Kingston, Oct. 7, 1907, 1 male. Neiv Jersey: Lakehurst, July 17, 1923, L. B. Woodruff, 1 female; Monmouth Co., Allaire, July 15-31, 1934, Reeve Bailey (Mich. Coll.), 2 males. 1 female. Pennsylvania: Philadelphia, July 6, 1921, J. C. Lutz (Lutz Coll.), 1 male; Stony Run. Nov., 1883 (Uhler Coll.), 1 male, 2 fe- males. Maryland: Great Falls, Dec. 11. 1925. D. H. demons, 1 male; Hyattsville, April 4, 1911, W. D. Appel, 1 female; Hyattsville, Aug. 23, 1914, W. D. Appel (U. S. N. M.), 1 male, 4 females; Pawtuxent Wild Life R., April 11, 1945, R. I. Sailer (U. S.N. M.), 2 males, 1 female; Maryland, Oct. 6 (Nat. Mus.), 2 males, 4 females; Bladens- burg, July 8. 1892 (O. Heidemann, Cornell U.), 2 males, 3 females. Virgi7iia: Church Cr., Sept. 9, 1906. D. H. demons, 1 female; Great Falls, May 22, 1906. D. H. demons, 1 male, 2 females. Washington, D. C: D. H. demons. 1 male; Rock Creek, March 19, 1905, D. H. demons, 1 male; Ajiril 4 (O. Heidemann, Cornell U.), 3 males; Sept. 18 (0. Heidemann, Cornell U.), 1 male, 3 fe- males; Oct. 27 (0. Heidemann, Cornell U.), 2 males, 4 females. North Carolina: Raleigh, Nov. 16, 1905, 3 males. 2 females (O. Heidemann, Cornell U.) ; Raleigh, March 1, 1905, 2 females (O. Heidemann, Cornell U.) ; Raleigh, April 11, 1906. C. S. Brimley, 1 female. South Carolina: Clemson Coh., March 24, 1931, D. Dunavan (S. C. Exp. Sta.), 4 males, 1 female; Richland, March 26, 1931, D. Dunavan (S. C. Exp. Sta.), 1 female; Rocky Bottom, Pickens Co., Sept. 20, 1931, D. Dunavan (S. C. Exp. Sta.), 3 males. Georgia: Wrens, Aug. 22. 1930, P. W. Oman, 14 males, 24 fe- males; Perry, Aug. 12, 1939, J. D. Beamer. 2 males, 1 female; Stone Mt., Aug. 3, 1912 (C. T. Dodd Coll.), 1 female; Marietta, March 5, 1911, J. C. Bradley, 2 females; Stone Mt., Aug. 5, 1912 (Cornell), 4 females; Gainesville, April 2, 1911, J. C. Bradley (holotype) (Cor- nell U.) ; Marietta, March 5, 1911, J. C. Bradley (paratype) (Cor- nell U.) ; Ashens. J. C. Bradley (paratype) (Cornell U.). Western Hemisphere Corixidae 517 Alabama: Mt. Meigs, July 21, 1930, R. H. Beam:r and L. D. Tuthill, 1 male, 1 female. Mississippi: Lauderdale, Aug. 17, 1930, R. H. Beanior, 1 male. Texas: Woods Co., Feb. 26, 1939, D. D. Millspaugh, 1 male. Hesperocorixa lucida (Abbott I (Plate LXXX, figs. 4, 4a-4h) 1916. Arctoiorissa lucida Abhott, .1. F. Ent. News XXVII, p. 343 (desc. fioni Conn., R. I. and Mass.). 1917. Arctocorixa lucida, Van Duzee, E. P. Catalosue of Hemiptera . . . , p. 482. 1917. Arctocorisa lucida, Parshii'V, H. M. Otc. Papii.- Boston Soc. Nat. Hist., VII, p. 117. 1923. Arclocoritta lucida. Abbott, J. F. Hemiptera or Sucking; Insects of Connecticut in Bull. Geol. Nat. Hist. Suiv. Hartford, Conn. XXXIV, p. 389, fig. 36, Nos. 3 and 9. 1926. Arctocorixa: lucida, Blatchley, AV. S. Heteroptera of Eastern North America, pp. 1069, 1072, fig. 9. 1928. Arctocorixa lucida, Hungerford, H. B. Ent. News, XXXIX, p. 156 (records Baker Co., Ga.). 1928. Arctocorixa lucida, Hungerford, H. B. .Annals Ent. Soc. Amer.. XXI, pp. 140-141, PI. VIII. figs. 7 and 8. 1930. Arctocorixa lucida. Walley, G. S. Can. Ent. LXII. p. 280 (records Pt. Pelee, Out.). 1936. Sigara (Aiiticorixa) lucida. Jaczewski, T. Proc. Royal Ent. Soc. I^ondon, V, Pt. 2, Ser. B, p. 43. 1938. Arctocorixa lucida, Biiniley, C. S. Insects of North Carolina, p. 84. Size: Length 8.5 mm. to 9.4 mm. Width of head across eyes 2.8 mm. to 3 mm. Color: General facies dark. Pronotum usually unicolorous, but sometimes with 7 to 8 brown bands faintly indicated. Clavus usually solid brown, but sometimes with a few obscure pale lines showing interiorl3^ Suture between clavus and corium marked with yellow. C'orium showing irregular brown i)attern which is etched away along margins and along membranal suture. Embolium sordid to smoky. Membrane smoky, with faint pattern or none. Structural characteristics: Head not quite half as long as pro- notal disk, vertex produced; facial hairs sparse; male fovea ovate, shallow, not attaining eyes laterally; antennal segmentation: 1 : 2 : 3 : 4 : : 28 : 20 : 60 : 31 ^ ; 1 : 2 : 3 : 4 : : 30 : 21 : 61 : 30 $ . Pronotum with faint median carina anteriorly; apex somewhat rounded but not as much as in H. escheri (Heer). Pronotum and hemelytra finely rastrate. Hairs on hemelytra scanty. Lateral lobe of prothorax quadrate, apex straight, no longer than broad. Mesoepimeron narrow, the osteole near the tip. Metaxyphus arrow- shaped, slightly broader than long. Front leg of male: Pala with sides nearly parallel, the distal end almost truncate, with about 20 pegs, basal carina prominent; tibia with short dorsal carina bearing tuft of 4 or 5 spines near distal end; femur relatively slender, with about 8 row.s of stridulatory 518 The University Science Bulletin teeth on inner basal portion. Middle and hind legs slender, the segmental proportions as follows: Middle leg: femur : tibia : tar- sus : claw : : iOO : 44.4 : 37.7 : 41.1. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 92 : 130 : 42. Male asymmetry dextral. Strigil of medium size, ovate, of about 8 regular combs. For details of male structures see Plate LXXX, figs. 4 to 4b. Comparative notes: This species may be distinguished from other Hesperocorixa by the incomplete corial pattern. Location of types: "Holotype, a male from Cheshire, Conn., May 6, 1911 (B. H. Walden). iVllotype female, same data. Paratypes from Kingston, Rhode Island, New Haven and Hamden, Connecti- cut, Forest Hills, Mass." I found these in Doctor Parshley's collec- tion bearing red type and paratype labels, ".4. lucida." It is a mixed lot. The holotype, allotype and 3 paratypes, 2 males, 1 female, "Cheshire, Conn., May 6, 1911, B. H. Walden; 2 males, 1 female, same place, March 20, 1911; 2 females, Hamden. Conn., June 1, 1911, B. H. Walden; 1 female, New Haven, Conn., Aug. 12, 1913, B. H. Walden; 1 female, Forest Hills, Mass., Nov. 1, 1915, H. M. Parshley; 1 male, 1 female. Forest Hills, Mass., May 4, 1915, H. M. Parshley; 1 female, Mass. Coll. of H. M. Parshley, No. 64; 1 male, Kingston, R. I., May, 1908." The above are "A. lucidar The following labeled as paratypes of A. lucida are not that species: "Durham, N. H., Oct. 4, 1901," 1 female, is H. atopodonta (Hunger- ford) ; "Hamden, Conn., June 1, 1911, B. H. Walden," 2 males, 2 fe- males, are H. kennicottii (Uhler). Through the kindness of Doctor H. M. Parshley, the holotype and allotype are deposited in the Francis Huntington Snow Collec- tions, University of Kansas, while most of the paratypes have been returned to Doctor Parshley. Data on distribution : (Plate LXXX\'. I The published records are Massachusetts, Rhode Island and Connecticut in tlic United States, and Ontario, Canada. We have studied the following: U. S. A.: Xew York: Ithaca, Spender L., July 4, 1918, 13 males, 1 female; Ithaca, Sept. -9, 1915, R. C. Smith (Drake) 1 male; V. Cortlandt Park, Aug. 3, 1925 (Wash. U. Coll. I, 5 males, 7 females; Yaphank, L. I., Sept. 11, 1925 (Wash. U. Coll.), 1 male, 3 females; White Plains, July 16, 1907 (Wash. U. Coll.), 1 female. Massachusetts: North Saugus, Aug. 25, 1908, 'D. H. demons, 1 female; Cambridge, 1 male; Natick, April 24, 1924, L. B. Wood- ruff, 1 female; Berlin, Sept. 8, 1935, C. A. Frost (U. S.N. M.), 1 fe- male. Western Hemisphere Corixidae 519 Coiniicticut: Cheshire, May 6, 1911, B. H. Walden. 1 male, 1 fe- male. Rhode Island: Kingston, May 5, 1908 (Abbott Coll.), 1 male. Pennsylvania: Philadelphia, Aug., 1914, Carl Ilg, 2 males, 3 fe- males; Philadelphia, June 30, 1941, J. C. Lutz (Liitz) ; Philadelphia, Aug. 5. 1929. J. C. Lutz (Lutz). New Jersey: Great Piece, May, 1902, 2 females; Riverton, Aug. 17, 1902, Van Duzee (Van Duzee), 1 male; Trenton, Oct., 1903, Hussey. 3 males, 6 females; Paterson, April, 1921. 1 male, 1 female; lona, July 7, 1938, J. C. Lutz, 3d (Lutz). Maryland: Bladensburg, July 8, 1892 (0. Heidemann, Cornell U.). Washington, D. C: July, 1910 (Cornell U. Colli, (7 males; Feb. 24, 1929. H. S. Barber (U.S. N. AD, 1 male. 4 females; (Uhler Coll.), Imale. Virginia: Norfolk, Aug. 11, 1925, Beamer and ^^IcKinstry, 38 males; Norfolk. April 9, 1932, L. D. Anderson, 50 females. Georgia: Baker Co., Nov. 23, 1927, C. H. :^Lartin. 4 males, 5 fe- males. Florida: Gainesville (Drake). Texas: 1 male. Arkansas: Hope, May 3, 1926, L. Knobel (Lutz 1 . Illinois: (Uhler Coll.) 1 male, 1 female; N. Illinois, W. H. Ash- mead, 1 male, 1 female. Michigan: Nigger Cr., Mullet L., July 30, 1925, H. B. Hunger- ford. 6 females; Berrien Co., June 30, 1919, R. F. Hussey (Hussey Coll.), 3 males, 2 females; Washtenaw Co., Frain's L., July 21, 1930, G. Cooper iMir-h. Coll.), 1 male, 2 females. Hesperocorixa escheri (Heer) (Plate LXXXI, fips, 4. 4a-Jic) lS.'i.3. CurUa tscheri Heer, O. Die Insecten fauna der Tertiiirgoliilde von Oeninsen HL p. >•? (footnote). (Described from New Georgia, Coa.st of Washington Terri- tory. ) T'Ti;. Ctmxa (M-hcri, Uhler. P. R. Bull. TJ. S. Geol. and Geog. Siuv. of Terr. No. 5, Vol. I. p. 341 (transl. of original description); also reprint of sanie separately paginated. Ifiii!!. Antocorisa esrhcri, l^irkaldy, G. W., and Torre-Buemi, .1. R. de la. Catalogue in Proc. Ent. Soc. Wash. X. p. 195. > 1917. Arctocorixa escheri. Van Duzee, E. P. Catalogue of Heniipteia, y>. 480. lOSfi. Arrtocorixa scahricula Walley, G. S. Can. Ent., LXVIU, pp. .'iij-oS, PI. II, figs. 11 and 1-2. 194."). Arctocoiix'i sicahricuhi, Griffith, I\I. E. Univ. of Kans. Soi. Bull. XXX. Pt. II, No. 14. p. 300. 520 The University Science Bulletin Size: Length from 10.2 mm. to 11.4 mm. Width of hem I across eyes 3.3 mm. to 3.7 mm. Color: General facies medium to dark brown. Head, venter and legs all yellow in ])ale specimens ; legs in darker specimens pale red- dish-brown. Pronotum crossed by 8 to 9 dark bands, those beyond center somewhat broken and irregular. Hemelytral pattern in regu- lar transverse series on clavus and on base of corium; pattern on (oiium beyond claval suture more broken. PatteiTi of membrane continuous with that of corium. Embolium yellowish white. Structural characteristics: Head more than half the length of the l)ronotal disk. Eyes convex, in some specimens almost bulging; ver- tex rounded. Frontal impression of male shallow, ovate, not attain- ing eyes laterally. Facial hairs few. Antennal segmentation: 1 : •) o 2 : 3 : 4 : : 30 : 28 : 57 : 40 J ; 1 : 2 : 3 : 4 : : 1 4 :: 35 : 29 : 65 : 47 5 . Pronotal disk slightly less than half as long as wide and rounded at apex; carina faintly visible on anterior margin. Pronotum rather rough and both pronotum and hemelytra rastrate, membrane shining. Hemelytra with a few long, yellow- white hairs. Lateral lobe of prothorax about as broad as long. Mesoepimeron slender with scent gland osteole located almost at tip. Metaxyphus arrow-shaped, slightly longer than Inoad. Male pala long and slender with sides almost parallel, blunt at apex, 28 to 30 teeth, largest in center; basal carina prominent. Tibia with short dorsal carina having tuft of 5 or 6 spines at distal end. Femur long and moderately slender, with patch of about 12 rows of stridulatory teeth on inner basal i)ortion. Middle and hind legs long and slender, the proportions of segment to segment as fol- lows: Middle leg: femur : tibia : tarsus : claw :: 100 : 41.4 : 3(i.5 : 38.9; hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 100.2 : 14().() : 50.1. Male asymmetry dextral. Strigil moderately large, suboval, with 9 to 10 rows of regular combs. For details of uimIc abdomen and genitalia see Plate LXXXI, figs. 4-4c. Comparative notes: The convex, slightly bulging eyes and the fact that the head is more than half the length of the pronotal disk, jikis the rounded appearance of the latter, will serve to siparate this s])ecies from other Hesperocorixa. In. addition, this species, Uu vigata and georgiensis are the only ones which have the tibia of tlic iiind leg longer than the femiu'. Location of type: Unknown to me. Heer's types are supposed ;o be at Zurich. * The Arctocorixa scabricula Walley was described * Priif. 1)1. A. .FcMnnct. under (l;ilf nf Foli. 21, 1047. s;iys tliis type is no !nnp:t<>rn N. A.. p|<. 1008, 1080. 1928. Arctocoiiia lii,imuinter and limbs yellow. Structural characteristics: Head one-third as long as pronotal disk, broadly rounded. Vertex sometimes slightly produced in fe- males; interocular space broader than an eye as measured by projec- tion; facial hairs* scanty, male fovea veiy shallow, ovate, not at- taining eyes laterally. Antennal segmentation : 1 : 2 : 3 : 4 : : 30 : 22 : 60 : 45 males; 1 : 2 : 3 : 4 : : 31 : 25 : 63 : 45 females. Pro- notal disk with very faint indication of median carina on anterior margin; apex slightly pointed. Pronotum nonrastrate, shining; the clavus and corium somewhat rastrate to rugulose. Hemelytra with fairly numerous long pale hairs. Pruinose area of embolar groove posterior to nodal furrow about one-third as long as embolium. Lat- eral lobe of prothorax quadrate, slightly rounded at apex, as broad as it is long. Mesoepimeron narrow, the scent gland osteole near tip. Metaxyphus arrow-shaped, pointed at apex, longer than broad. Front leg of male: Pala with sides subparallel, broad, bluntly rounded at distal end, with about 24 to 26 teeth in peg row, carina at base not prominent; tibia with slight dorsal carina, bearing a single long spine near distal margin; femur moderately slender, without rows of stridulatory pegs on inner basal portion. Middle and hind legs moderately slender, the segmental proportions as fol- lows: Middle leg: femur : tibia : tarsus : claw :: 100 : 49 : 36.7 : 35.7. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 101.8 : 125.8 : 55.5. Male asymmetry dextral. Strigil moderately long, sides parallel, ends round, of about 6 to 8 regular combs. For de- tails of male structures see Plate LXXXI, figs. 3, 3a and 3b. Comparative notes: The reticulate pattern of the hemelytra will serve to distinguish this species from all other Hesperocorixa. Location of types: I find in the Uhler Collection of the U. S. National Museum the following type series: "San Diego, Cal., 10- 19-1890, Corixa laevigata Uhler,'' 1 male, 2 females; "Gala," 1 male, 1 female; "Goronado, Gal," 1 male; "Sonoma Go., Galif.," 1 male; Western Hemisphere Corixidae 523 Coupeville, Wash., 1 male; "Nev.," 1 female. Have labeled the male from San Diego, Cal., as the lectotype and the others as co- types. Data on distribution: (Plate LXXXIII.I The published records include: Utah, California, Wash. Terr., Oregon, Lower California, Arizona, Texas, Idaho, New Jersey, Maryland and Rhode Island. We have before us the following: C.\nada: Bntish Columbia: Peachland, Aug. 20, 1901, J. B. Wallis (WalHs Coll.), 1 male; Peachland, Oct. 7, 1931, A. N. Gart- rell, 3 males; Sept. 11, 1945, H. B. Leech, 2 females; Oliver, Aug. 6, 1931, L. D. Anderson, 2 males, 1 female; Chiliwack, July 9, 1925, 2 females; Kamloops, Nov. 1, 1929, Owen Bryant (Bryant Coll.), 3 females; Cranbrook, Sept. 17, 1928, J. H. Pepper (Bryant Coll.), 1 male, 2 females; Vernon, Dec. 12, 1908, Parshley (Parshley Coll.), 2 females; Vernon, Sept. 26, 1929, W. Dbwnes, 3 males, 1 femiale; Metchosin. Aug. 30, 1929, W. Downes, 1 male, 1 female; Sahack's Lake fUhler Coll.), 1 male. AUxrta: MacLeod, Sept. 15, 1928, Owen Bryant (Bryant Coll.), 2 males; Lethbridge, May 8-20, 1930, J. H. Pepper (Bryant Coll.), 6 females; Chin. Sept. 7, 1929, J. H. Pepper (Bryant Coll.), 1 male, 5 females. Manitoba: :Mafeking, Aug. 3, 1937, C. L. Johnston, 1 male; Awcmc. Sept. 11. 1916, Nonnan Criddle, 2 females. U. S. A.: Washington: Kalama River, July 21, 1931, L. D. An- derson, 1 male; Pullman, Aug. 6, 1900, C. V. Piper, 1 male; Pullman, March 7, E. P. Van Duzee (Van Duzee). Oregon: Modoc Point, July 11, 1935, R. H. Beamer, Jr., 1 male; Hood River, July 17, 1931, L. D. Anderson, 1 male, 1 female; Board- man, July 15, 1931, L. D. Anderson, 1 female; Hot Lake, July 13, 1931. L. D. Anderson, 1 female; North Powder, July 13, 1931, L. D. Anderson. 8 males, 4 females; Worden, July 1, 1935, R. H. Beamer, Jr., 1 male, 1 female; Corvallis, Dec. 16, 1900 (Drake Coll.), 1 male, 2 females; Harney Co., Trout Creek, July 26, 1934, C. L. Hubbs (Mich. Coll.), 1 male, 3 females; Klamath Co., Klamath R., Aug. 15. 1934. C. L. Hubbs (Mich. Coll.), 9 males, 14 females; Malheur Co.. July 24. 1934, C. L. Hubbs (Mich.); Lake Co., Ruby Lake, Sept. 12, 1934. C. L. Hubbs (Mich.) ; Lake Co., Quartz Creek, Aug. 9, 1934, C. L. Hubbs (Mich.); Lake Co., Warner Lake, July 30, 1934. C. L. Hubbs (Mich.) ; Lake Co., Plush, July 29, 1934, C. L. Hubbs (Mich.); Harney Co., Denio, Aug. 3, 1934. C. L. Hubbs (Mich.) ; Klamath Co., Lost R., Aug. 11, 1934, C. L. Hubbs (Mich.). 524 The University Science Bulletin California: San Bernardino Co., Mohave R., Aug. 31, 1934, C. L. Hubbs (Mich.), 1 female; Ventura Co., Simi, Aug. 26, 1934, C. L. Hubbs (Mich.), 2 males, 1 female; California, T. H. Hubbell (Hub- bell Coll.), 3 males, 4 females; Berkeley, June, 1917, W. W. Hender- son (Utah Exp. Sta.), 2 males, 2 females; Laguna Beach, C. T. Dodd, 15 males, 18 females; Berkeley, Sept. 23, 1915, E. C. Van Dyke (Calif. Acad, i ; Laguna Mts., July (J, 1929, L. D. Anderson, 3 females; Sonona Co. (Hussey Coll. I, 1 male; Paso Robles, April 22, 1928, L. S. Slevin (Calif. Acad.); Sonona Co. (Parshley Coll.), 1 male, 2 females; Sonona Co. (Uhler Coll.), 1 female; California (Uhler Coll.), 1 male, 2 females; Fresno Co., 9,000 ft., Mt. Kaiser. Aug. 2, 1919, F. E. Blaisdell (Calif. Acad.) ; San Diego (Uhler Coll.), 1 male, 2 females; San Diego Co., Oct. 17, 1913, E. P. Van Duzee (Van Duzee) ; Coronado (Uhler Coll.), 1 male; Stanford U., 2 males. 1 female; Vine Hill, Contra Costa Co.. July 5-10, 19]], E. Blaisdell (Calif. Acad.); Stanford U. (Torre-Bueno Coll.). 1 female; Napa Mts., Napa Co.. 1,000 ft., 1 female; Idyllwild, Aug. 3, 1935. J. Beamer, 6 males, 6 females; Sequoia Nat. Park. Aug. 6, 1940. L. C. Kuitert, 1 male, 1 female; Mint Canyon, July 6, 1933. J. D. Beamer. 5 males. 3 females; Weed, June 29, 1935, R. H. Beamer, 10 males, 19 females; Mammoth Lakes, July 20, 1940, L. C. Kuitert, 1 male; Alpine, July 9, 1929, R. H. Beamer, 1 male, 3 females; San Jacinto Mts., July 21, 1929, P. W. Oman, 2 males, 3 females; Calexico, Aug. 1, 1931, H. W. Capps, 1 male; Bantista Canyon, April 8, 1931, C. H. Martin, 1 female; Canby, Kelly Springs, 1931, C. T. Brucs, 1 fe- male; Los Banos, May 22, 1918, E. P. Van Duzee; Antioch, July 20, 1935, R. H. Beamer, 1 female; Tejon Pass, July 28. 1918, J. O. Martin; Arroyo Seco, Aug. 8, 1938, R. I. Sailer, 3 males, 6 females; Onyx, .July 23. 1940, L. C. Kuitert, 5 males, 6 females; Lone Pine, July 28, 1940. L. C. Kuitert, 3 mak's, 3 females; Red Bluff, June 27, 1935, Jack Beamer, 1 male, 1 female; Palmdale, July 22, 1940, L. C. Kuitert, (J males, 7 females; Palmdale, June 9, 1918, J. O. Martin; Little L., July 22. 1!)40, L. C. Kuitert, 7 males, 5 females; Jacumba, July 17. 1940. L. C. Kuitert, 1 male, 3 females; Campo, July 18. 1940, L. C. Kuitert, 1 male, 8 females; Al Tohoe, June 28. 1929, R. L. Usinger (Calif. Acad.); St. Helena, Sonora Co.. July, 1907, P. Bomberger (Calif. Acad.); Berkeley, Apnl 26, 1933, Jean Lins- dale, 1 female; Monrovia Canyon, March 2, 1930. C. H. Martin, 1 female; Mann Co.. Aug. 3, 1929, L. D. Anderson. 1 female; Car- mel. Aug. 30. 1938, L. S. Slevin, 1 female; Modoc Co., July 31, 1934, C. L. Hubbs (Mich.); Walnut Creek, Aug. 9, 1929, R. L. Usinger, Western Hemisphere Corixidae r)25 2 males; Oakland Hills, Ai)iil 22, 1927, R. L. Usinj^er, 2 females; Santa Barbara, July 7, 1907 (Drake Cull.), 1 male, 3 females; Benton, Hot Springs, Oct. 7, 1942, A. P. McKinstry, several hundred specimens; Keeler, July 6, 1914, Wickham, 1 male; Monterey. April 23, 1923, L. S. Slevin (Calif. Acad.); San Francisco, Wickham, 1 female; San Francisco, Sept. 5, 1909, J. A. Kusche (Calif. Acad.). Idaho: Soldier (Nebr. Coll.), 1 male, 2 females; Clark Co., Med- icine Lodge. July 17, 1934, C. L. Hubbs (Mich. Coll.), 1 male, 1 fe- male; Clark Co.. Beaver Cr., July 16, 1934, C. L. Hubbs (Mich. Coll.), 2 males; Blaine Co., Fish Cr., July 22, 1934, C. L. Hubbs (Mich.), 2 males; Snake River (Uhler Coll.), 1 male, 1 female; Burley, July 6. 1931, L. D. Anderson, 36 males, 49 females; Mos- cow (Bueno Coll.), 1 male, 2 females. Utah: Garfield, July 9, 1911 (Bueno Coll.), 1 female; Utah (Uhler Coll.), 1 male; Utah (U. S. Nat. Mus.), 1 female; Tooele, pond, Aug. 23, 1937, L. L. Hansen, 1 male, 2 females; Lehi, April 4, 1930, G. F. Knowlton (Utah Exp. Sta.), 1 male; Hyde Park, April 19. 1930. G. F. Knowlton (Utah Coll.), 1 female; Duchesne, Aug. 17, 1940, L. C. Kuitert, 1 male; Logan, Nov. 5, 1930, M. J. James, 1 male, 3 females; Emery Co., 1921-1922, G. C. Wiley, 268 males, 221 females; Salt Lake, March 15, 1901, R. Usinger, 1 male; Ogden, July 5, 1891. O. Heidcmann (Cornell U. Coll.), 2 females; Provi- dence, Oct. 3, 1931, D. M. Hammond (Utah Exp. Sta.), 1 male; Jensen, June 5, 1935, F. C. Harmston (Utah Exp. Sta.), 2 females; Brigham, Aug. 16, 1934, G. F. Knowlton (Utah Exp. Sta.), 2 males, 6 females; Brigham, Aug. 16, 1934, F. H. Gunnell (Utah Exp. Sta.), 1 male; Logan, Sept. 28, 1932, B. G. Whitaker (Utah Exp. Sta.), 2 males, 2 females; Logan, Oct. 5, 1930, Melvin Jensen, 5 males, 3 females (Utah Exp. Sta.) ; Logan, Nov. 20, 1933, T. O. Thatcher (Utah Exp. Sta.). 2 females; Logan, Sept. 11, 1937, F. C. Harm- ston (Utah Exj). Sta.), 3 females; Sardine Canyon, Aug. 3. 1935, C. F. Smith (Utah Exp. Sta.), 1 male, 3 females; Grantsville, April 27, 1930, G. F. Knowlton (Utah'Exp. Sta.), 1 male; West Bountiful, March 10, 1934, H. B. Stafford (Utah Exp. Sta.), 1 female; Wells- ville, Aug. 16, 1934, Knowlton and Smith (Utah Exp. Sta.), 1 fe- male; Delta (at light), July 5, 1938, Stains and Knowlton (Utah Exp. Sta.), 1 female; American Forks, April 4, 1930, G. F. Knowl- ton (Utah Exp. Sta.), 1 female; Lehi, June, 1934, G. F. Knowlton (Utah Exp. Sta.), 2 males, 1 female; Logan Meadows. March 31, 1929, C^T. F. Knowlton (Utah Exp. Sta.), 2 males, 3 females; Logan, Dec. 8, 1935. R. E. Nye (Utah Exp. Sta.), 2 males. 1 female; Far 526 The University Science Bulletin West, Feb. 7, 1934, W. L. Thomas (Utah Exp. Sta.). 1 male; Hooper, July 1, 1936, G. F. Knowlton (Utah Exp. Sta.), 1 male. 2 females; Farming-ton, Aug. 26, 1936, G. F. Knowlton (Utah Exp. Sta.), 1 male, 2 females; Syracuse, July 6, 1936, G. F. Knowlton (Utali Exp. Sta.), 1 female; Spanish Fork. July 24, 1936, G. F. Knowlton (Utah Exp. Sta.), 3 females. Nevada: Austin, Aug. 12, 1940, L. C. Kuitcrt, 1 male, 1 iiniale; Reno, Oct. -Nov., 1939, L. A. Rivers, 2 males, 2 females; Sunnyside, 1930, C. T. Brues, 1 male, 1 female; Carson City, Aug. 9, 1929, L. D. Anderson, 20 males, 28 females; Ely, Aug. 13, 1940, L. C. Kui- tert, 12 males, 13 females; Reno, Aug. 15, 1936, Owen Bryant (Bry- ant Coll.), 1 male, 5 females; Nevada (Uhler Coll.), 1 female; Warm Spring, Sept. 8, 1934, C. L. Hubbs (Mich.) ; Esmeralda Co.. Fish Lake, Sept. 5, 1934, C. L. Hubbs (Mich. Coll.), 1 female; Elko Co., Sept. 14, 1934, C. L. Hubbs (Mich. Coll.), 4 males, 5 females; Nye Co., Sept. 3, 1934, C. L. Hubbs (Mich Coll.), 3 males, 2 females. Arizona: Apache Co., Springerville, Aug. 17, 1935, I. J. Cantrall (Mich.), 2 males, 5 females; Yavapai Co., Peoples Valley, 6 mi. n. Yarnell, May 19, 1937, L. K. Gloyd (Mich. Coll.), 1 male, 1 female; Huachuca Mts., March 16, 1919, R. D. Camp (Mich. Coll.), 1 male, 2 females; Arizona (U. S. N. M.), 1 female; Foxborough Ranch, Aug. 1, 1936, Owen Bryant (Bryant Coll.), 2 males, 1 female; S. W. edge of Tucson, July 20, 1932, R. H. Beamer, 1 male, 1 female; Chiricahua Mts., July 5, 1940, L. C. Kuitert, 1 male; Ruby, July 12, 1940, L. C. Kuitert, 1 male; Cochise Co., July 20, 1927. R. H. Beamer, 3 males, 9 females; Yavapai, Aug. 9, 1927, P. A. Readio and L. D. Anderson, 42 males, 26 females; same place and date, R. H. Beamer, 2 sinistral males; Coconimo Co., Aug. 13, 1927. P. A. Readio, 10 males, 10 females; Santa Cruz Co., Aug. 4, 1927, R. H. Beamer, 2 males, 2 females; San Bernardino Ranch, Cochise Co., F. H. Snow, 1 male, 1 female; Douglas, August, F. H. Snow, 2 males, 8 females; Mormon Lake, May 1, 1936, Owen Bryant (Bryant Coll.), 2 males, 4 females; Navajo Co., Aug. 15, 1927, L. D. Ander- son, 1 female; Pullman, Aug. 6, 1900, 1 female; Oak Creek Canyon, July 9, 1941, L. C. Kuitert, 7 females. Montana: Montana (Uhler Coll.), 1 male. 3 females; Tlirce Forks, July 22, 1931, L. D. Anderson, 7 males, 9 females; White- hall, Aug. 13, 1931, L. D. Anderson, 3 males, 1 female; Drummond, Aug. 11, 1931, L. D. Anderson, 2 males, 2 females; Missoula, Aug. 11, 1931, L. D. Anderson, 1 male; Bennett, Aug. 12, 1931, Western Hemisphere Corixidae 527 L. D. Anderson, 2 males, 1 female; Bozeman, April 28, 1}»16 (Mont. Exp. Sta.), 1 male. Wyoining: Boulder, Aug. 19, 1931, L. D. Anderson, 1 male; Sweetwater Co., Green R., Sept. 16, 1934, C. L. Hubbs (Mich. Coll.), 3 females. Colorado: Denver, July, 1905, Hayden (Uhler Coll.), 1 female; Hillside (6 mi. S.), Aug. 25, 1941, H. C. Severin, 1 male, 1 female; Steamboat Springs, Aug. 21, 1941, H. C. Severin, 2 males, 3 females; La Junta, Aug. 22, 1927, L. D. Anderson, 7 males, 4 females; Las Animas Co., Sept. 22, 1927, R. H. Beamer, 4 males, 6 females; Ft. Collins, Aug. 11, 1900, F. H. Snow, 1 male, 2 females; Denver, July 16, 1909, W. J. Gerhard (Gerhard Coll.), 2 males, 1 female; Ft. Collins, Aug. 17, 1940, 4 males; Univ. of Colo, campus, Oct. 2, 1917, 1 male, 1 female; Pingree Park, Aug. 11, 1926, Beamer and Lawson, 1 female. Neiv Mexico: Santa Cruz Co., Aug. 20, 1927, L. D. Anderson, 9 males, 6 females; Mesilla Park, July 18, 1927, L. D. Anderson, 1 female; Santa Fe, July 30, 1936, R. H. Beamer, 4 males, 4 females; Socorro Co., Aug. 18, 1927, Beamer, Anderson and Readio, 54 males, 31 females; New Mexico (Uhler Coll.), 2 males, 2 females; Tor- rence Co., 1925, C. A. Martin. North Dakota: Lake Metagoshe, July 20, 1937, C. L. Johnston, 1 male. South Dakota: Belvidere, Sept. 22, 1939, G. A. Sprawn, 2 males; Newell, June 28, 1923, H. C. Severin, 2 females; Wood, July 23, 1929, H. C. Severin, 1 male, 1 female; Vivien, June 20, 1939, H. C. Severin, 1 female; Capa, June 1, 1921, H. C. Severin, 1 male, 4 females; Wasta, July 17, 1937, H. T. Peters, 1 male, 2 females; Draper, July 19, 1937, R. H. Beamer, 4 males, 7 females. Nebraska: Nebraska (Uhler Coll.), 2 females. Kansas: Sherman Co., Aug. 1, 1925, R. H. Beamer, 7 males, 5 females; Cheyenne Co., July 3, 1925, R. H. Beamer, 1 male, 1 female; Logan Co., Sept. 22, 1925, R. H. Beamer, 2 females; Scott Co., Aug. 31, 1925, R. H. Beamer, 2 males, 1 female. Oklahoma: Tulsa Co., March 21, 1922, Grace Wiley, 1 female. Texas: Bowie Co., Aug. 16, 1928, A. M. James, 3 females; Pre- sidio Co., July 16, 1927, P. A. Readio, 3 males, 6 females; Colorado Co., May 2, 1922, G. C. Wiley, 1 female; Texas (C. V. Riley Coll.), 2 females. 528 The University Science Bulletin Minnesota: Minnesota (Bueno Coll.), 1 female; Minneapolis, April, 1907, R. A. Vickery (Nat. Mus.), 4 females. Wisconsin: St. Croix R., Aug. 17, 1928, Schultz and Tarzwell, 1 male (Mich.). Illinois: N. Illinois (111. U. Coll.), 1 female. Mississippi: Agri. Col., May, 1919, W. G. Raines (Miss. Coll.), 1 male, 2 females. Ohio: Ohio, L. Shoelch (Bueno Coll.), 1 female. Neiv York: Carmel, Aug. 12, 1910, 1 female; New York (Uhler Coll.), 3 females; New York, P. R. Uhler (Uhler Coll.), 1 male. Rhode Island: Rhode Island (Uhler Coll.), 2 males. Maryland: Maryland (Uhler Coll.), 1 female. North Carolina: Black Hills (Uhler Coll.), 4 males, 2 females. Mexico: Real del Monte, Hidalgo, vSept. 23, 1938, H. D. Thomas, 6 males, 7 females. Hesperocorixa hayrisii (Uhler) (Plate LXXXI, fig. 2, 2a-2b) 1878. Corisii liarrisii Uhler. P. R. Proc. Boston Soc. Nat. Hist. XIX, p. 444 (No. 22B in Harris Collection). ]892. Curifa liarrisii. Oshorii, Herbert. Proc. Iowa Acad. Sci. I, Pt. II. p. 120 (luwa). Record not verified. 18ft2. C'arisa liarrisii, Uhl. Harrington, W. Hague. Fauna Ottawaensis, Ottawa Naturalist \l, II. 30. Very abundant. ]8!t3. Corina liarrisii. Osborn, Herbert. Proc. Iowa Acad. Sci., Vol. I, Pt. IV, ]). 128 (records Albuquerque, N. M.). An error in determination. 1804. Ciiriaa liarrisii. Van Duzee, E. P. Bull. Buffalo Soc. Nat. Sci. V, p. ISO (sajs quite abundant in a pond at Ridgeway, Ontaria, in August, 1886). 19114. Curisa harrisii. Crevecoeur, F. F. Trans. Kans. Acad. Sci. XIX, p. 234 (in stock pond, Mar. -Oct.); (probably H. vulgaris Hungerford). 1009. Arctororisa liarrisii, Kirkaldy, G. W., and Torre-Bueno, .1. R. de la. Catalogue /)/ Proc. Ent. Soc. Wash. X, p. 195. 1910. Arrtocorisa harrisii. Smith, J. B. Insects in N. J., 3d ed., p. 169 in Report of N. .1. State Museum for 1909. 1913. Arctocorisa interrupta, Abbott, J. F. Wash. Univ. Studies I, No. 1, pp. 10-20. fig. IB. (In part, placed H. harrisii as syn. in error.) 1914. Corixa harrisii, Parshley, H. M. Psyche XXI, p. 140. (Orcmo, Maine.) This i- H. atopodonta Hungerford. 1917. Arctocofixa harrisii. Van Duzee, E. P. Catalogue of Hemiptera . . . , p. 481. 192.'). Arctocorixa harrisii, Hungerford, H. B. Bull. Brooklyn Ent. Soc, XX, No. 3, i>. 141 (restores to specific rank). 1920. Arctocorixa hurrim, Blatchley, W. S. Heteroptera of Eastern N. A.. |i. 1068, 1070, PI. XII, fig. 8 (lists Indiana). 192H. Arctocorixa harrisii. Torre-Bueno, .7. R. de la, in A list of the Insects of New York, p. 141 (lists N. Y.). 1930. Arctiicorixii liarrisii. Walley, Ci. .'^. Can. Ent. LXII, p. 281 (((uotcs \'an Duzee, 1894). . Size: Length 9.6 mm. to !().() luin. Width of head jicross eyes 3.1 mm. to 3.4 mm. Western Hemisphere Corixidae 529 Color: Cleneral facics dark. Pronotum crossed by 10 to 11 dark, irregular bands. Pale pattern of hemelytra in very narrow, more or less regular transverse lines. Dark areas tending to coalesce at inner apical angle of corium. Outer apical angle much paler. Mem- branal suture indistinctly marked by fusion of pale lines. Head, legs, and margins of venter pale yellowish; coxae and inner .-urface of venter smoky. Embolium yellowish-white. Structural characteristics: Head about one-third the length of pronotal disk; vertex slightly produced; facial hairs scanty; male fovea distinct, ovate, not quite attaining eyes laterally; antennal segmentation: 1 : 2 : 3 : 4 : : 32 : 21 : 60 : 40 ^ ; 1 : 2 : 3 : 4 : : 32 : 21 : 60 : 40 5 . Pronotal disk with faint median keel on anterior margin; somewhat pointed at ai)ex. Pronotum and hemelytra faintly rastrate, the membrane sliining. Hemelytra with a few long white hairs. Pruinose area of embolar groove posterior to nodal furrow about one-third the length of emboliimi. Lateral lobe of prothorax quadrate, slightly rounded across apex, plainly broader than long. Mesoepimeron narrow, the scent gland osteole near the tip. Metaxyphus arrow-shaped, no longer than broad. Front leg of male: Pala subparallel-sided, distal end trunratc. 21 to 24 teeth in peg row, basal carina not prominent, pala with basal two-thirds much thickened as seen in dorsal view. Tibia with pronounced dorsal carina bearing tuft of about 4 spines on distal end; femur moderately stout with patch of about 8 to 10 rows of stridulatory teeth on inner basal portion. Male asymmetry dexti-al; strigil small, long and narrow, of about 8 to 10 regular combs. For details of male structures see Plate LXXXI, figs. 2, 2a and 2b. Comparative notes: This species is close to H. vulgaris (Hungfd. I , from which it differs in having the vertex slightly produced. Al- though the membranal suture is marked by a yellowish line, this division is not nearly so definite as in some of the other species, and in some specimens cannot be found at all. Location of type: In the Harris collection of the Boston Society of Natural History are Harris No. 22B and 501, labeled l)y Chas. W. .Johnson as cotypes of Corisa harrisii Uhler. I examined these in tlie early 1920's and found that No. 22B, which should be desig- nated the lectotype, lacked the head and prothorax and the abdomen was dermestid-eaten, with part of the caudal segments, the genital capsule and the strigil eaten away. Nevertheless, I was able to find that my determination of the species is correct. The 501 is a 34—822 530 The University Science Bulletin female, also dermestid-eaten, but is not C. harrisii but H. lobata (Hunger ford). Data on distribution: (Plate LXXXIII.) According to Blatcliley the range extends from New England to Indiana. Wc have studied the following: Can.\da: Montreal Island, Quebec, May 30, 1903, purch. from Wash. U. by H. B. H., 1 female. U.S.A.: Verjnont: Winooski, Aug. 30, 1901 (Davis Coll.), 1 fe- male. Massachu.-;etts: Woods Hole, 6 males, 7 females; Springfield, April 19, 1900, F. Knabb, 1 male, 1 female; Wilbraham, Oct. 2, 1902, F. Knabb, 2 females; Forest Hills, May 3, 1922, E. F. Hussey, 1 male; Marblehead, Aug. 8, 1914, H. M. Parshley (Parshley Coll.) ; Nonamesset Island. July 7, 1911, J. F. Abbott, 85 males. 162 females. Rhode Island: (C. F. Baker in U. S. N. M.). New Jersey: Ramsey, Sept. 19, 1909, 6 females; Riverton. Aug. 17, 1902, E. P. Van Duzee (Van Duzee). New York: Long Island, Sept. 25, 1937, J. C. Lutz. 1 male; W. Shokan, July 30, 1909 (Amer. Mus. Nat. Hist. Coll.), 1 female; Brooklyn, 1898, W. H. Ashmead, 2 females; Fisher's Island, L. I.. Aug. 29, 1890, 1 female; Tompkins Cove, L. I., Aug. 10, 1910, 1 female; Carmel, Aug. 12, 1910, 1 female; New York, May 29, 1899, J. B. South wick, 1 female; Cold Springs Harbor, L. I., July 26. 1920, Priscilla Butler (Hussey). Hespcrocorixa vulgaris (Hungerford) (Plate LXXXI, figs. 6, 6a -6b) 1925. Arctocorixa vulgaris Hungerford, H. B. Bull. Brooklyn Ent. Soc. XX, pp. 143- 144, PI. VI, figs. 1 and 2 (desc. from Kansas :ind records from South Dakota, Minnesoia, Michigan, Ohio and New York). 1926. Arctaccn-ixa vulgarL^, Blatcliley, W. S. Hcteroptera of Eastern North America, pp. 1069, 1071. (Records "Mass. and west to Ohio and S. D.") 1928. Arctocorijca vulyaris, Torre-Bueno, J. R. de la. List of Insects of New York. p. 141 in Cornell Univ. Agri. Exp. Sta. Memoir 101. 1930. Arctocori-xa vuJrinm, Walley, O. S. Can. Ent. LXII, p. 281 (records Ontarin and Quebec, Canada). 1931. Sigara (Atiticorixa) lalgaris. Jaczewski, T. Arch, fur HvilnOnol. XXIIt. pi>. .">! t- 516, figs. 17-19. (Records Tacoma, Wash., in Hamburg Mus.) 1936. Sigara (Anticorixa) rulgam, Jaczewski, T. Proc. K-iyal Ent. Sno. LoikU.h. Scr, B, V, Pt. 2, p. 42. 1946. Arctocorixa vulgaris. Proctor, Wm. Biol. .Surv. Mt. Desert Kes-'ion, Inc., Pt. \ 11. The Insect Fauna, p. 82 (Mt. Desert Isl., Maine). Size: Length 9.2 mm. to 10.1 mm. Width of head across eyes 3 mm. to 3.3 mm. Color: General facies dark. Pronotum crossed by aliniit 10 Western Hemisphere Corixidae 531 broad dark bands, regular except one or two toward posterior mar- gin. Clavus with broad, dark bands in somewhat zigzag transverse series. Corium transversely marked with pale, slender, slightly zig- zag lines. Pale bands beyond hemelytral suture forming a slender, transverse series. Corium and membrane not clearly separated. Pattern on membrane more broken than that on corium. Head and limbs pale. Venter, of male at least, dark. Embolium yellowish white. Structural characteristics: Head slightly more than one-third the length of the pronotal disk; vertex not produced, interocular space broad; facial hairs long but scanty; male fovea shallow, ovate, not attaining eyes laterally. Antennal segmentation: 1:2:3:4:: 30 : 21 : 50 : 40 J ; 1 : 2 : 3 : 4 : : 28 : 21 : 50 : 40 5 . Pronotal disk with faint indication on anterior margin of median carina ; apex somewhat pointed. Pronotum and hemelytra heavily rastrate. Hemelytra with a veiy few pale hairs. Lateral lobe of prothorax quadrate, apex slightly rounded, no longer than broad. Mesp- epimeron slender with osteole near the tip. Metaxyphus arrow- shaped, no longer than broad. Front leg of male: Pala with sides nearly parallel, the apex slightly produced, about 18 to 20 pegs in peg row, basal carina prominent; tibia with short dorsal carina bearing tuft of about 3 short spines distally ; femur rather stout, with patch of about 9 rows of stridulatoi-y pegs on inner surface near base. Middle and hind legs slender, the segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 42.6 : 33.6 : 33.6; hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 83.9 : 107.7 : 45.4. Male asymmetry dextral. Strigil long and slender, of 5 regular combs. For details of male structures see Plate LXXXI, figs. 6 to 6b. Comparative notes: This species is nearest to H. harrisii (Uhl.) from which it differs in having a shallower male fovea, in not having the vertex produced, and in not having the lateral lobe of the pro- thorax broader than long. Location of types: Described from good series taken in Douglas Co., Kansas. Holotype, allotype and paratypes in Francis Hunting- ton Snow Collections, University of Kansas, Lawrence, Kansas. Data on distribution: (Plate LXXXIL) The published records in- clude Washington State, Kansas, South Dakota, Minnesota, Michi- gan, Ohio, New York and Maine in the United States, and Ontario and Quebec provinces in Canada. We have before us the following: 532 The University Science Bulletin Canada: Quebec: Montreal, 1896, Appa (Kirkaldy Coll.), 1 male, 1 female; Montreal Island, May 30, 1903 (Wash. U. Coll.), 1 male; He Jesus, Sept. 24, 1932 (record by G. S. Walley) ; He de Montreal, Beaulieu, May 21. 1903. New Brunsunck: St. Croix R.. Oct. 23, 1893, W. C. Kendall. Ontario: Ottawa, J. I. Beaulne, Oct. 26, 1913; Toronto, Nov. 21, 1931, E. C. Oakley, 1 male. Manitoha: Winnipeg, June 12, 1910, J. B. Wallis (Wallis Coll.), 1 male. 1 female; Stony Mts., May 28, 1910, J. B. Wallis (Wallis Coll.), 2 females; Russell, Aug. 1. 1937, C. L. Johnston, 1 male; Aweme, Oct. 11, 1916, N. Criddlc. Alberta: MacLeod, Sept. 15, 1928, Owen Bryant (Bryant). British Columbia: Cranbrook, Sept. 17, 1928, Owen Bryant (Bryant) ; Oliver, Aug. 6, 1931, L. D. iVnderson, 1 male. N. W. Terr.: E. P. Van Duzee. U. S. A.: Maine: Orono, May 8, 1912, H. M. Parshley (Parshley Coll.) 3 males, 1 female; Peak's Isld., Aug. 3, 1927, G. A. Moore. New Hampshire: Durham, Osborne Coll. 2 females (Parshley) ; Crawford, Sept. 23, 1916, H. M. Parshley (Parshley Coll.), 1 male; Star Lake, 1 male; Hampton, April 18, 1922, S. Albert Shaw; Center Ossippee, July 10, 1934, M. W. Sanderson, 1 male; New Haverhill, Aug. 21, 1934, P. A. McKmstry, 5 males, 7 females; Bath, Aug. 21, 1934, R. H. Beamer and P. IMcKinstry, 2 females; Carroll, summer 1934, N. H. Preble, 1 male. Vermont: Winooski, Aug. 30, 1901 (Davis Coll.), 1 female. Massachusetts: Farmingham. May 2, 1915, C. A. Frost, 1 fe- male; Peru, Aug. 21, 1904, 2 males; Amherst, Aug. 26. 1904, 1 fe- male (Parshley) ; Northampton, Sept. 17, 1931, K. L. Slingerland, 3 females; Melrose High, D. H. demons, 1 male; Massachusetts (Uhler Coll.), 1 female; Brooks, 1878 (Uhler Coll. I. 1 male; North- ampton, Oct. 31, 1917, H. M. Parshley (Parshley Coll.), 1 male; same place, Nov. 1, 1919, Priscilla Butler, 1 female; Forest Hills, 1915, H. M. Parshley (Parshley Coll.), 2 males, 4 females. Rhode Island: Kingston. Nov. 11, 1909, 1 female; Rhode Island, 1 male. Connecticut: New Haven. Aug. 23, 1934, P. McKinstry, 2 males; New Canaan, April 30, 1919, M. P. Zappe, 2 males, 3 females. New Yoi-k: Ashokan, 1 female. 1 male; Gowanda, Aug. 2-9. 1907, E. C. Van Dyke (Van Duzee) ; Essex Co., Aug. 2, 1895. 3 females; Western Hemisphere Corixidae 533 Long Island, May, 1 male; Long Island, Queen's Village, Sept. 25, 1937, J. C. Lutz (Lutz) ; W. Shokan, July 30, 1909, 3 males; Car- mel, Aug. 12, 1910, 1 female; Long Island, Cold Spring Harbor, July 26, 1920, Priscilla Butler (Hussey) ; Tompkins Cove, L. I., Aug. 10, 1910, 3 females; Bronx Park, N. Y., Sept., 1930, J. Torre-Bueno (Bueno Coll.), 6 males, 2 females; Ithaca, Nov. 19, 1921, H. B. Hungerfoi'd, 3 males, 15 females; Long Island, 1 male; Ithaca, Oct. 28, 1917, E. C. Van Dyke (Calif. Acad.) ; White Plains, Aug. 13, 1907, 2 males, 1 female; same place, Sept. 13, 1919, R. F. Hussey (Parshley) ; Tompkins Co., July 8, 1919, McLean, 2 females; Lone Lake, Aug. 19, 1909, 1 male; Sodas Bay; White Plains, Sept. 13, 1919, Torre-Bueno (Bueno Coll.), 1 female. Neic Jersey: Ramsey, Sept. 19, 1909, 3 males, 3 females; Trenton, Oct., 1930, J. Torre-Bueno (Bueno Coll.), 1 female; Rancoca, Aug. 29, 1937, E. M. Becton, 1 male; Paterson, Sept., 1901, 1 female; lona, July 27, 1941, J. C. Lutz (Lutz I. Pennsylvania: Pine Grove Mills, July 22, 1942, V. R. Haber, 1 female; Barrens, Aug. 5, 1942, V. R. Haber, 1 female; State College, summer 1930, Casselberry, 6 females; Pittsburgh, H. G. Klages, 1 female. Wa.shington, D. C: D. H. demons, 1 male, 1 female. Virginia: Virginia Beach, Aug. 11, 1934, M. E. Griffith, 1 female; Norfolk, Aug. 11, 1934, P. McKinstry, 1 female. North Carolina: C. V. Riley, 1 female. Georgia: Okefenokee Swamp. Mississippi: Agricultural College, Aug. 20, 1913, J. G. Hester (Miss. Coll.), 1 male, 5 females. Texas: (C. V. Riley Coll.) Kansas: Douglas Co., Oct. 28, 1921, Robert. Guntert, 2 males, 3 females; Douglas Co., 900 ft., May 6, 1911, F. X. Williams, 1 fe- male; Douglas Co., Stubbs Pond, April 8, 1921, H. B. Hungcrford, 2 females; same place and collector, Nov. 27, 1922, 2 females; Doug- ' las Co., Feb. 15, 1921, H. B. Hungcrford, 13 males, 19 females; Douglas Co., Sept. 28, 1921, Robert Guntert, 7 males, 13 females; Atchison Co., July 11, 1924, E. P. Breakey, 1 male; Wathena, Aug. 4, 1904, W. Mann (Parshley) ; Onaga, 1 male; Cowley Co., Feb. 23, 1921, W. E. Hoffmann, 1 female; Pratt Co., April 12, 1925, R. H. Beamer, 1 male; Decatur Co., 2,560 ft., F. X. Williams, 1 female; Scott Co., June 21, 1925, R. H. Beamer, 3 males, 3 females; Wichita Co., 3,300 ft., F. X. Williams, 2 females; Logan Co., Sept. 22, 1925, 534 The University Science Bulletin R. H. Beamer, 1 male, 2 females; same place, 3,322 ft., F. X. Wil- liams, 1 female; Thomas Co., F. X. Williams, 1 male. Illinois: Palos Park, Sept. 12, 1908, W. J. Gerhard (Field Mus.), 2 males; Chicago, Sept. 12, 1908, W. J. Gerhard (Field Mus.), 1 male; Evanston, Sept. 23, 1904, E. Liljeblad (Mich. Coll.), 4 males, 5 females; northern Illinois, Ashmead. 1 female (det. by Uhl. as harrisii) ; Urbana, H. Kahl (Carn.), 2 males, 4 females; Edgebrook, Nov. 7, 1903, W. J. Gerhard (Parshley) ; Chicago, April 10, 1904, A. B. Wolcott (Parshley) ; Urbana, Nov. 9, 1911; Champaign, Nov. 12, 1927, A. T. McClay (Usinger) ; Havana. April 20, 1895, Hart and Newberry (111. Nat. Hist. Surv.) ; Morgan Co., June 14. 1898, F. M. McE. (Drake). Indiana: Miller, Aug. 24, 1918, W. J. Gerhard < Field Mus. Coll.), 1 female; Clark Junction, Aug. 1, 1904, W. J. Gerhard (Field Mus.), 1 female; Dune Park, Aug. 2, 1904 (Field Mus.), 2 females; Clark Junction, Aug. 7, 1904, W^ J. Gerhard (Field Mus.), 3 males, 6 fe- males. Ohio: Columbus, July 9, 1930, C. H. Hicks (Lutz) ; Ira, Summit Co., Aug. 31, 1916, C. J. Drake (Drake), 3 males, 4 females; Berea, Dec. 19, 1911, 1 female (Drake) ; Tiffin. Aug. 26. 1916. C. J. Drake (Drake) , 2 females. Michigan: Washtenaw Co., Oct. 30, 1917, R. F. Hussey (Husscy Coll.), 10 males, 13 females; Berrien Co., Sept. 2, 1919, R. F. Hus- sey (Hussey Coll.), 1 male, 2 females; Washtenaw Co., Nov. 10, 1918, P. Butler (Hussey Coll.), 2 males, 3 females; same place, March 30, 1918, R. F. Hussey (Hussey Coll.), 2 males, 7 females; same place, March 31, 1933, 2 females; same place, Oct. 5, 1918 (Mich Coll.), 7 males, 10 females; same place, Sept. 26. 1914, F. M. Gaige (Mich. Coll.), 1 male, 6 females; same place, Ann Arbor, May 25, 1918, F. M. Gaige (Mich. Coll.), 4 males, 11 females; same place, March 30, 1920, T. H. Hubbell (Mich.), 2 males, 2 females; same place, April 20, 1917 (Mich. Coll. I. 3 males, 2 females; same place, Oct. 5, 1916 (Mich. Coll.), 2 females; Washtenaw Co., April 21, 1933 (Mich. Coll.), 1 male, 4 females; same place. Ann Arbor, June 28, 1921, T. H. Hubbell (Mich.) , 1 male, 3 females; Ann Arbor, Nov. 3, 1917 (Mich. Coll.), 3 females; same place, July 11, 1901 (Mich. Coll.), 4 males, 8 females; same place, E. H. Frothingham (Mich. Coll.), 1 male, 1 female; same place, Miss Haynes (Mich. Coll.), 3 males, 3 females; same place, Oct., 1916 (Mich Coll.), 1 male, 3 females; same place, March 7, 1894, Wolcott (Nebr. Coll.), Western Hemisphere Corixidae 535 3 males, 1 female; Berrien Co., July 4, 1919, R. F. Hussey (Hussey Coll.), 1 female; Ann Arbor, June,. 1921, R. F. Hussey (Hussey Coll.), 11 males, 9 females; Livingstone Co., Aug. 10, 1919, same collector (Hussey Coll.), 2 males, 2 females; same place, Lakeland, same date and collector (Mich.), 1 female; Battle Creek, Aug. 26, 1920, P. Butler (Hussey Coll.), 6 males; same place and collector, Aug. 22, 1920 (Hussey Coll.), 20 males, 35 females; Ostego Co., State Park, Aug. 14, 1930, G. Cooper (Mich. Coll.), 1 male, 1 female; Jackson Co., April 23, 1933 (Mich. Coll.), 1 female; Cheboygan Co., Aug. 3, 1917, R. F. Hussey, 10 males, 20 females (Mich. Coll.) ; same place and collector, 1918 (Hussey Coll.), 4 males, 4 females; same place, July 11, 1938, H. B. Hungerford, 2 males, 4 females; same place and collector, Aug. 7, 1930, 12 females; Burt Lake, July 7, 1923, same collector, 2 males, 6 females; Bois Blanc Island, Aug. 14. 1932, same collector, 4 females; North Michigan, Aug. 23, 1930, same collector, 2 females; Pellston Road Pool, 1930, same collector, 6 females; Nichol's Pond, Doug. L., July 22, 1929, same collector, 2 females; Douglas Lake, July 27, 1924, same collector, 5 males, 1 female; Douglas Lake, Sedge Pool, July 3-6, 1923, same collector, 20 males, 48 females; Douglas Lake, Bryant's Bog, July 17, 1923, same collector, 11 males, 11 females; Douglas Lake, Mud Lake, July 31, 1923, same collector, 2 males, 5 females; Douglas Lake, Bessey Creek, July 18, 1923, same collector, 1 female; Douglas Lake, Beach Drift, Aug. 3, 1923, same collector, 1 female; Douglas Lake, Smith's Bog, Aug. 8, 1923, same collector, 1 male, 2 females; Druid Hill (Uhler Coll.), 1 female; Taquamenon R., Luce Co., May 20, 1925, J. Metzelaar (Mich.), 1 male, 3 females; Mason Co., March 27, 1925, same collector (Mich.), 1 female; Grand R., Kent Co., March 21, 1925, same collector (Mich.), 1 female; Lenawee Co., Tiffin R., Nov. 15, 1925, C. L. Hubbs (Mich.), 1 female; Grand Traverse Co., Boardman's R., May 13, 1925, J. Metzelaar (Mich.), 1 male; Leighton Swamp, Allegan Co., March 10, 1925, same col- lector (Mich.), 4 males, 6 females; S. Haven, Aug. 4, W. J. Gerhard (Parshley). Wisconsin: St. Croix R., Aug. 17, 1928, Schultz and Tarzwell (Mich.), 8 males, 5 females; (Bueno Coll.), 1 female; (C. F. Baker in U. S. N. M.); Dane Co., March 16, 1930, E. P. Breakey, 13 fe- males; Madison, August (Drake) ; Dane Co., April 19, 1930, E. P. Breakey, 1 male, 6 females; Brule, Aug. 16, 1937, C. L. Johnston, 1 male, 2 females; Beaver Dam, March 21, 1910, W. E. Snyder (Parshlev). 536 The University Science Bulletin Minnesota: St. Paul, July 28-31, 1921, H. B. Hungerford, 59 males, 33 females; same place and collector, July 11, 1921, 2 males, 4 females; same place, July, 1934, C. L. Granovsky, 4 males, 3 fe- males; same place, Sept. 22, 1919, R. F. Hussey (Hussey Coll.), 6 males. 7 females; same place and collector, Sept. 8, 1918 (Mich. Coll.), 1 female; same place, Como Park Greenhouse. Aug. 16, 1921, Wm. E. Hoffmann (Minn. Coll.), 1 male, 1 female; same place, 1926, C. Mohr (Minn. Coll.) ; St. Paul, Hussey 's Pool, Aug. 7, 3921, W. E. Hoffmann (Minn.), 2 males, 6 females; St. Paul, L. Johanna, Sept. 24, 1921, same collector (Minn.), 1 male; Minneapolis, Univ. campus, Aug. 17, 1921, W. E. Hoffmann (Minn.), 1 female; same place, April, 1907, R. A. Vickery (Nat. Mus.), 1 female; same place, Sept. 11, 1919, R. F. Hussey (Hussey Coll.), 7 males, 2 females; Rocliester, July 16, 1921, H. B. Hungerford, 1 male, 5 females; Becker Co., Shell L., Aug. 22, 1922, same collector, 6 females; Ben- gal, Aug. 18, 1922, same collector, 2 males; Two Harbors, Aug. 9, 1922, same collector, 1 female; Carlson, Aug. 8, 1922, same collector, 1 female; Pine River, Big Trout Lake, Aug. 26, 1939, H. E. Severin (S. Dak.) ; Washington Co., May 15, 1917 (Lutz) ; Pelican Rapids. Aug. 22, 1922, H. B. Hungerford, 6 males, 11 females; Lake Co.. Stony River Camp No. 9, Aug. 15, 1922, same collector, 1 female; St. Louis Co., Aug. 14, 1922, same collector, 3 males, 7 females; Eveleth, Aug. 13, 1937, C. L. Johnston, 2 males, 2 females; Bird's Island, Aug. 25, 1921, W. E. Hoffmann (Minn. Coll.), 1 male, 1 fe- male; Itasca Park, Aug. 21, 1922, H. B. Hungerford, 1 male; Minne- haha Creek, Hennepin Co., July 9, 1921, same collector, 2 females; Ramsey Co., April 20, 1933, D. Pletch, 2 females; (Uhler Coll.), 2 males. Iowa: Mt. Pleasant, Nov. 3, 1927, S. R. Ewart (Lutz); same place, March 24, 1939, D. S. Millspaugh; Iowa, April 3, 1940, D. S. Millspaugh; Sioux City, C. N. Ainslee, 1 male; Iowa City, G. Sev- erin, 1 male, 1 female. North Dakota: Ramsey Co., L. Irvin, Aug. 21, 1922, T. L. Hank- inson (Mich. Coll.), 7 males, 20 females; Ransom, Cheyenne R., Sept. 19, 1922, C. Thompson (Mich. Coll.), 4 males, 3 females; Mc- Ville, July 27, 1937, Beamer and Johnston, 7 males, 8 females; Northwood, July 27, 1937, H. T. Peters, 2 females; Sanborn, July 23, 1937, C. L. Johnston, 5 males, 8 females; Linton, July 23, 1937, H. T. Peters, 2 males, 3 females; L. Metagoshe, July 30, 1937, H. T. Peters, 1 female; Fargo, Sept. 29, 1918, 0. A. Stevens, 1 female. South Dakota: Miller, July 20, 1937, R. H. Beamer, 2 males. Western Hemisphere Corixidae 537 3 females; Brookings, July 19, 1919, H. C. Severin, 1 female; Wasta, July 17, 1937, H. T. Peters, 2 males; Pierre, July 19, 1937, C. L. Johnston, 1 female; Bradley, July 21, 1937, R. H. Beamer, 2 males, 5 females; Woods, July 23, 1939, tl. C. Severin (S. Dak.) ; Pickerel L., Sept. 14, 1939, same collector (S. Dak.) ; Victor, Dry Run L., Sept. 13, 1939, same collector (S. Dak.) ; Clear Lake, July 19, 1939, same collector (S, Dak.) ; Lake Traverse, Sept. 13, 1939, same col- lector (S. Dak.) ; Webster, Sept. 14, 1939, same collector (S. Dak.) ; Roslyn, same date and collector (S. Dak.) ; W^aubay, Sept. 14, 1939, same collector (S. Dak.) ; Belvidere, Sept. 22, 1939, G. B. Spawn (S. Dak.); Chancellor, Dec. 8, 1939, same collector (S. Dak.); Chamberlain, Sept. 18, 1939, same collector (S. Dak.) ; Oak Lake, Aug. 22, 1939, Wynn Eakins (S. Dak.) ; Brookings Co., L. Oakwood, Aug. 11, 1939, H. C. Severin (S. Dak.); Ft. Pierre, July 20, 1939, same collector (S. Dak.) ; White River, July 23, 1939, same collec- tor (S. Dak.); Ortley, Sept. 14, 1939, same collector (S. Dak.); Huron, Sept. 18, 1939, same collector (S. Dak.) ; Arlington, June 19, 1939, same collector (S. Dak.). Nebraska: Lincoln (Nebr. Coll.), 6 males, 10 females; same place, Nov. 12, 1925, Owen Bryant (Bryant). Montana: Drummond, Aug. 11, 1931, L. D. Anderson, 1 male; Rapeke, Sept. 14, 1928, 1 female. Washington: Mason Co., L. Cushman, Aug. 3, 1919, P. Putnam (U. S. N. M.) , 5 males, 3 females. Oregon: North Powder, July 13, 1931, L. D. Anderson, 1 male; Florence, July 11, 1935, R. H. Beamer, 2 males, 1 female. California: Idyllwild, Aug. 3, 1935, Jack Beamer, 1 female. Hesperocorixa georgiensis (Egbert) (Plate LXXX. figs. 5, .5a -5b) 1946. Antirorixa i/eorgiensis Egbert, A. M. .11. Kan.s. Ent. Soc. XIX, No. 4, pp. 133- 13.5, 1 plate. Size: Length 8.8 mm. Width of head across eyes 3.2 mm. Color: General facies rather dark. Pronotum crossed by 8 or 9 dark, regular bands which are interrupted along the center beyond the pronotal keel by a narrow yellow stripe. Pale figures of clavus almost coalescing basally ; dark figures tending to merge along mar- gins. Corium with dark figures broad, transverse, irregular; black patch at distal end of embolium and at inner distal angle of corium; outer distal angle with V-shaped patch of pale yellow. Membrane separated from corium by pale brown line, and with paler pattern, 538 The University Science Bulletin except outer border which has blackish patch. Venter and limbs pale yellow. Structural characteristics: Head of male, when viewed from above, a little more than half the length of the pronotal disk; the frontal arch very slightly produced. Facial impression of male slight, not reaching middle of eyes; facial hairs sparse. Antennal segments: 1 : 2 : 3 : 4 : : 30 : 21 : 60 : 35 s ■ Pronotal disk with faint median keel on anterior margin; disk somewhat pointed at apex. Dorsal surface of insect shiny, the pronotum finely ras- trate, the clavus rastrate only along the hemelytral suture, rugulose at base, the corium very finely rastrate. Hemelytra with very few hairs. Pruinose area of embolar groove posterior to nodal furrow about one-third the length of the embolium. Lateral lobe of the prothorax plainly longer than broad, tip truncate. Mesoepimeron narrow, the osteole of the scent gland close to tip. Metaxyphus arrow-shaped, longer than broad. Front leg of male: Pala sub-parallel-sided with distal margin almost straight; about 23 teeth, of which those at either end are smaller than those in middle, basal carina present but not prom- inent; tibia two-thirds as long as pala with dorsal carina bearmg cluster of about three spines at distal end; femur relatively stout with about 8 or 9 rows of stridulatory teeth at base of inner surface. Middle and hind legs of moderate size ; hind leg with tibia slightly longer than the femvu-; tlie proportions of segment to segment as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 46.4 : 37.1 : 35.9. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 102 : 122.4 : 32.6. Male asymmetry dextral; -strigil very long, reaching from posterior margin of segment 5 almost to the posterior margin of segment 7, and having 10 rows of fairly regular combs. For details of male structures see Plate LXXX, figs. 5, 5a and 5b. Comparative notes: This species is nearest in general appearance to laevigata (Uhl.), from which it differs in having a nonreticulate hemelytral pattern and a clearly defined membranal suture. It differs from lucida (Abbott), which it also somewhat resembles, in being almost without rastration, in having a complete corial pattern, and in having the tibia of the hind leg slightly longer than the femur. Location of types: Described from one male labeled "Baker Co., Georgia, Oct. 23, 1927, C. H. Martin." Holotype in Francis Hunt- ington Snow Collections, University of Kansas, Lawrence, Kansas. Western Hemisphere Corixidae 539 Data on distribution: (Plate LXXXIV.) Known only by the tyjie. Hesperocorixa nitida (Fieber) (Plate LXXX, figs. 3, 3a-3b) 1851. Corisa nitida Fieber, F. X. Species Generis Corisa, p. 28, PI. II, fig. 8 (desc. from North Carolina in Germar coll.). 1909. Arctocorisa nitida, Kirkaldy, G. W., and Torre-Bueno, J. R-. de la. Catalogue in Proc. Ent. See. Wash. X, p. 196. 1913. Arctocorisa nitida, Abbott, J. F. Bull. Brooklyn Ent. Sue. VIII, p. 82 (records Spring Creek and Okefenokee Swamp, Ga.). 1914. Arctocorixa nitida, Parshley, H. M. Psyche XXI, No. 5, p. 110 (from Orono, Me.). (This is H. atopodonta Hungfd.) 191.T. Arctocorisa nitida, Abbott, J. F. Washington Univ. Studies II, p. 81 (Billy's Isl. in Okefenokee Swamp, Ga.) 1917. Arctocorisa nitida. Parshky, H. M. Occas. Papers of the Boston Soc. of Nat. Hist., VII, p. 117. 1917. Arctocorixa nitida, Van Duzee, E. P. Catalogue of Hemiptera . . . , p. 482. 1923. Arctocorisa nitida, Abbott, J. F. The Hemiptera or Sucking Lice of Connecticut, p. 389, fig. 36 — No. 6 in Bull. Geol. Nat. Hist. Surv. Hartford, Conn. XXXIV (records New England). 1926. Arctocorixa nitida, Blatchley, W. S. Heteroptera of Eastern North .A.merica, pp. 1068 and 1070, PI. XII, fig. 6 (records Staten Isl., N. Y. and Indiana). 1928. Arctocorixa nitida, Torre-Bueno, J. R. de la. A List of the Insects of New York, p. 141, in Cornell Univ. Agri. Exp. Sta. Memoir 101. 1928. Arctocorixa nitida. Hungerford, H. B. Ent. News XXXIX, p. 156 (records Baker Co., Ga.). 1929. Sigara nitida. Lundblad, O. .\rehi\-. fijr Hydrobiologie, XX. pp. 300-303, figs. 4- 8, PI. X, fig. 1 (examined type). 1931. Sigara nitida, Lundblad, O. Zool. Anzeiger, XC\'I, Heft 3-4. pp. 85-95 (specimen in Halle "Nordamer. Leg. Zimmerman." ^ ). 1933. Arctocorixa nitida. Fattig, P. W. Ent. News XLIV, p. 152 (falling on auto in Ga., det. by H. G. Barber). 1936. Sigara (Anticorixa) nitida, Jaczewski, T. Proc. Royal Ent. Soc. London V, Pt. 2, Ser. B. p. 42. 1938. Arctocorixa nitida. Brimley, C. S. Insects of North Carolina, p. 84. Size: Length 8 mm. to 9 mm. Width of head across eyes 2.7 mm. to 3.1 mm. Color: General facies dark. Head, limbs, and venter yellow. Pronotum with about 9 broad, regular, dark bands. Claval pattern in more or less regular transverse series, the dark bands broader than pale ones, and growing irregular distally. Pattern of corium irregu- lar and broken though still in more or less transverse series. Dark areas tending to merge at innor apical angle of corium. Pattern of membrane slightly more broken than that of corium ; not separated from corium, except indistinctly in occasional specimens by fusion of pale lineations. Embolium smoky. Structural characteristics: Head about one-third as long as pro- notal disk ; vertex rounded ; facial hairs few ; male fovea ovate, fairly shallow, not attaining eyes laterally. Antennal segmentation: 1 : 2 : 3 : 4 : : 27 : 18 : 60 : 30 males; 1 : 2 : 3 : 4 : : 24 : 20 : 55 : 30 540 The University Science Bulletin females. Pronotal disk with faint indication of median carina on anterior margin; apex somewhat pointed. Pronotum and hemelytra finely rastrate, membrane shining. A few long, pale hairs on heme- lytra. Lateral lobe of prothorax a little longer than broad, quadrate, apex rounded slightly. Mesoepimeron narrow, the osteole near the tip. Metaxyphus arrow-shaped, a little longer than broad. Front leg of male: Pala elongate with sides nearly parallel, upper apical margin slightly produced but rounded; about 22 teeth in peg row; basal carina prominent; tibia with short dorsal carina bearing tuft of about 4 short spines distally; femur slender, without patch of stridulatory teeth on inner surface. Middle and hind legs rela- tively slender, the segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 41.8 : 33 : 39.6. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 96.1 : 125.4 : 48.1. Male asymmetry dextral. Strigil small, sides parallel, ends rounded, with about 8 regular combs. For details of male structures see Plate LXXX, figs. 3-3b. Comparatii'e notes: This species is nearest to H. internipta (Say) from which it differs in its smaller size and in having a row of al)out 10 spines on the distal portion of the rear margin of the hind femora. Location of types: The type material studied by Fieber in Berlin Museum and in Halle, Germany. Studied by 0. Lundblad and by me. Data on distribution: (Plate LXXXIII.) The published records are Maine, Mainland, North Carolina, Georgia, New York and In- diana. The Maine record was based on a misdetermination. We have seen the following: U. S. A.: New York: Long Island, H. Muske, 1 female; Long Island, May, 1 male; Buffalo (E. P. Van Duzee Coll.), 1 male; Flatbush, L. I., April 12, 1890, 1 female. Massachusetts: Melrose High, D. H. demons, 1 male; Massa- chusetts, F. Blanchard, 2 females. Hhode Island: 1 male (Abbott Coll.). Pennsylvania: Barrens, Aug. 5, 1942, V. R. Haber, 2 males, 2 fe- males; Philadelphia, April 1, 1938, J. C. Lutz (Lutz Coll.), 1 male. Maryland: Plummer's Island, Aug. 15, 1913, Barber (Barber Coll.), 1 male; Maryland, Oct. 6 (U. S. N. M.), 2 females. Virginia: Great Falls, May 16, 1920, Priscilla Butler, 2 females. Western Hemisphere Corixidae 541 Washir}gton, D. C: D. H. demons, 2 males; Rock Creek (Uhler Coll.), 1 male; Potomac R., in pot holes, Oct. 17, 1940, J. A. Fowler (U. S. N. M.), 4 'females. North Carolina: C. V. Riley, 1 male; Raleigh, December (Abbott Colli ; Halifax, Feb. 3, 1913 (U. S. N. M.), 1 female; Raleigh, Oct. 11, 1915, R. H. Leiby, 5 males, 3 females; Fuguay Spring. June 22, 1911, 2 males, 1 female; Southern Pines, June 19, 1915, H. M. Parsh- ley (Parshley), 1 male; Southern Pines, 1915, A. H. Manee, 2 males, 2 females (U.S. N. M.). South Carolina: South Carolina (Uhler Coll.), 1 male; Bennetts- ville, Nov. 17, 1931, 0. L. Cartwright (S. C. Exp. Sta.), 1 male. Georgia: Charlton Co., Camp Pinckney, June 22, 1922, A. H. W. andM. D. P., 3 males, 2 females; Charltcm Co., Saddlebag Pond, June 30, 1922, M. D. Pirnie, 1 male; Johnson Co., Sept. 5, 1929, Creasei- and Becker, 2 males, 8 females; Houston Co., Sept. 4, 1929, Creaser and Becker, 1 male, 5 females; Baker Co., Oct. 23, 1927, C. H. Martin, 10 males, 44 females; Baker Co., Dec. 23, 1946, L. W. Morgan. H males, 15 females; Albany, Oct. 27, 1927, C. H. Martin, 1 male, 3 females; Decatur, Spring Cr., July 16, 1912 (Cornell U. Coll.), 6 males, 2 females; Okefenokee Swamp, July 27, 1939, J. D. Beamer, 1 male, 1 female; Prattsburg, July 25, 1930, R. H. Beamer, 2 males, 2 females; Wrens, Aug. 22, 1930, P. W. Oman, 8 males, 11 females. Florida: Gainesville, Dec. 14, 1937, H. B. Hungerford, 1 male. Alabama: Crawford, July 24, 1930, P. W. Oman. 12 males, 8 females; Mt. Springs, July 21, 1930, R. H. Beamer and L. D. Tuthill, 6 males and 11 females; Montgomery, July 7, 1939, J. I). Beamer, 1 female. Mississippi: Vicksburg. July 19, 1921, C. J. Drake (Drake Coll.), 3 males, 1 female; Lauderdale, July 17, 1930, R. H. Beamer, 1 male, 2 females; Hamilton, July 15, 1930, P. W. Oman, 3 males, 3 females; Beaumont, April 19, 1932, H. Dietrich, 1 male, 2 females; luka, July 14, 1930, P. W. Oman, 1 male. Tennessee: Fentress Co., AUardt, Aug. 17, 1922, T. H. Hubbell (Mich. Coll.), 1 female; Murfreesboro, Aug. 29, 1929, Creaser and Becker, 1 male; Perryville, July 20, 1926, T. E. White, 1 male. Ohio: Ohio (Uhler Coll.), 1 female. Indiana: Indiana (Abbott Coll.). Michigan: Druid's Hill (Uhler Coll.), 1 male. 542 The University Science Bulletin Illinois: Illinois (Uhler Coll.), 1 female; Farina, AV. E. Snyder; Olive Branch, Oct. 8, 1909, Gerhard (Field Mus. Coll.), 4 males. 9 females. Minnesota: Minnesota (Bueno Coll.), 1 female. " Iowa: Iowa (Uhler Coll.), 2 females. Missouri: St. Louis, 2 mi. west, June 10, 1904, W. \. Warner, 1 female. Louisiana: Mound, Sept. 26, 1918, 2 males, 1 female; Opelousas Pilate (Uhler Coll.), 1 male, 1 female; Louisiana, C. F. Baker, 2 males, 1 female. Texas: Bowie Co., Aug. 20, 1928, R. H. Beamer, 1 male; Woods Co., Feb. 5, 1939, D. S. Millspaugh; Athens, Dec. 5, 1938, D. S. Millspaugh. Kansas: Cherokee Co., Aug., 1920, Hungerford and Beamer, 1 male, 1 female. Hesperocorixa martini (Hungerford) (Plate LXXXI, figs. 7, 7a-7b) 1928. Arctocorixa martini Hungerford, H. B. Ent. News XXXIX, p. l.')7 (de?c. from Georgia). 1936. Sigara (Anticorixa) martini. Jaczewski, T. Proc. Royal Ent. Soc. London. Ser. B, Vol. V, Pt. 2, p. 42. Size: Length 8.7 mm. to 10.2 mm. Width of head across eyes 3.3 mm. to 3.9 mm. Color: General facies dark. Pronotum crossed by 9 to 10 irreg- ular dark bands. Clavus with dark bands much broader than pale lineations and forming regular series. Dark bands of corium not quite so broad as on clavus; pale lineations in regular series an- terior to tip of claval suture, more broken and irregular thereafter. Membrane smoky with pattern obscure; indistinctly separated from corium by fusion of pale lineations; in some cases not separated at all. Embolium smoky. Structural characteristics : Head slightly less than half as lung as pronotal disk; vertex slightly produced in both sexes; facial hairs few; male fovea large, ovate, and deeply concave, attaining eyes laterally; antenna! segmentation: 1 : 2 : 3 : 4 : : 35 : 22 : 60 : 35 (^ ; 1 : 2 : 3 : 4 : : 35 : 27 : 60 : 40 $ . Pronotal disk with carina faintly indicated on anterior margin; apex somewhat pointed. Pro- notum and liemelytra heavily rastrate, membrane shining. Hcmel- ytra with a few long, pale hairs. Lateral lobe of i)rothorax ciuadrate. the end truncate. Mesoepimeron very slender, the scent gland Western Hemisphere Corixidae 543 osteole near tip. Metaxyphu.^ as broad as lung; arrow-shaped. Thorax, as seen in hiteral view, somewhat elevated. Front leg of male: Pala long, the sides almost parallel, rounded distally, about 30 pegs, larger at base, and smaller and more crowded distally, basal carina fairly prominent; tibia with tuf-t of four or five spines distally on dorsal carina; femur fairly slender, with about 7 rows of stridulatory teeth on inner surface near center. Middle and hind legs rather stout, the middle femora stout and spinose; segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 44.1 : 35.3 : 38,2; hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 93.5 : 120.2 : 41.8. Male asym- metry dextral. Strigil elongate, of moderate size, with 10 regular combs. Right clasper of male genital capsule stout and turns transversely across capsule. For details of male structures see Plate LXXXI, figs. 7, 7a and 7b. Comparative notes: This species closely resembles H. obliqua (Hungfd.) from which it differs in the shape of the pronotal disk, in having the metaxyphus as broad as long, and in having the frontal depression of the male large and concave. Location of types: Described from 47 specimens taken by C. H. Martin in Baker Co., Georgia, Oct. 23, 1927. Holotype, allotype and paratypes in the Francis Huntington Snow Collections, Uni- versity of Kansas. Data on distribution: (Plate LXXXIV.) Besides the type series we have the following: Houston Co., Ga., Sept. 4, 1929, Crcaser and Becker, 5 males, 6 females; Plant City, Fla., Jan. 4, 1927, C. 0. Bare, 1 female. Hesperocorixa obliqua (Himgerford) (Plate LXXXI. t^gs. :.. :3a -r,b) l'J2.). Arctocoiixa obliqua Hungeifoid, H. B. Bull. Brooklyn Ent. Soc, XX, pp. 142- 143, PI. VI, figs. 3 and 4. (Desc. from Kansas and records Texas, Oklahoma, Missouri, Iowa, Minnesota, Illinois, New York and New Jersey.) 1926. Arctocorixa obliqua, Blatchley, W. S. Heteroptera of Eastern North Aniericii, pp. 1069, 1070-1071, fig. 215, b (records Indiana). 1928. Arctocorixa obliqua, Hungerford, H. B. .\nnals Ent. Soc. Amer. XXI. p. 144, PI. VIII, fig. 12 (ventral view of male). 1928. Arctocorixa obliqua, Torre-Bueno, J. R. de la. A List of Insects of New York, p. 141 in Cornell Univ. Agri. E.xp. Sta. Memoir 101. 1936. Arctocorixa obliqua, Walle\ , C S. Can. Ent. LX^'III, i>. CO. (Records Eastern Panhandle, West Virginia, Iowa.) 1936. Sigara (Anticorixa) obliciua. ,Jaczi'w>ki. T. Proc. Royal Ent. Sue. London, Ser. B, V, Pt. 2, p. 42. Size: Length 10.1 mm. to 11 mm. Width of head across eyes 3.4 mm. to 3.6 mm. 544 The University Science Bulletin Color: (Jcneral facies dark. Pronotum with about 12 narrow black bands, somewhat broken posteriorly. Dark bands of clavus narrower at base than pale areas, but broader distally, in transverse series, but somewhat irregular and broken. Pattern of corium wavy and broken throughout; lines somewhat transverse but very irregular. Pattern of membrane continuous with that of corium. Embolium smoky to black. Head, limbs, and venter yellow to reddish brown. Structural characteristics: Head about one-third length of pro- notal disk; vertex rounded; facial hairs few; male fovea concave, ovate, not attaining eyes laterally. Antennal segmentation: 1:2: 3 : 4 : : 28 : 22 : 60 : 41 ^ ; 1 : 2 : 3 : 4 : : 28 : 22 : 57 : 42 5 . Pro- notal disk with faint indication of median carina on anterior margin, apex somewhat pointed. Pronotum and hemelytra plainly rastrate, membrane shining. Lateral lobe of prothorax quadrate, no longer than broad. Mesoepimeron narrow, the osteole near the tip. Meta- xyphus arrow-shaped, plainly longer than broad. Front leg of male: Pala elongate, sides almost parallel, with distal end oblicjuely produced, twenty-four to twenty-five pegs, basal carina not prominent; tibia with dorsal carina bearing tuft of 4 to 5 short spines distally; femur moderately slender, without stridulatory pegs on inner surface. Middle and hind legs slender throughout, the segmental proportions being as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 42 : 34 : 40. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 93.1 : 116.4 : 39.4. Male asym- metry dextral. Strigil fairly large, long, of about eleven regular combs. For details of male structures see Plate LXXXI, figs. 5 to 5b. Cotnparative notes: The ol)liquely produced male pala will serve to distinguish the males of this species. It is most closely related to martini (Hungfd.) from which it differs in having the mctaxyphus longer than broad, and in not having a stout, spinose hind femur. Location of types: Described from 218 specimens from Douglas Co., Kansas. Holotype, allotype and many paratypes in Francis Huntington Snow Collections, University of Kansas. Other para- types in the U. S. National Museum, University of Minnesotii, Cor- nell University, Carnegie Museum, and the private collections of J. R. de la Torre-Bueno, H. M. Parshley, R. F. Hussey, C. J. Drake and H. O. Barber. l)(tt(i on (listribution: (Plate LXXXll.) The i)ublished records include Kansas, Texas, Oklahoma, Missouri, Iowa, Minnesota, Uli- Western' Hemisphere Corixidae 545 nois, Indiana, New York, New Jersey and West Virginia. Wc have studied the following: Alaska: Noorvik, Kobiik River, Aug. 6, 1925, Mrs. S. Chance, 1 female. U.S.A.: New York: Long Island (Bueno Coll.), 3 females; Staten Island (Bueno Coll.), 1 female; Bronx Park, N. Y., Sept., 1930, Torrc-Bueno (Bueno Coll.), 1 male, 2 females; Ithaca, 1 male; Cold Spring Harbor, L. I., July 26, 1920, Priscilla Butler (Hussey) ; Van Cortlandt Park, Feb. 5, 1903, 1 male; New York City, 1 male; Staten Island, Nov. 8, 1903 (Wash. U. Coll.), 2 females. MassacMisetts: Woods Hole (Wash. U. Coll.), 1 female; Welles- ley, April, 1891 (Uhler Coll.), 1 female. New Jersey: Lake Forest, J. G. Needham, 10 males, 6 females; Palisades, Sept. 7, 1903 (Wash. U. Coll.), 1 female. Pennsylvania: Barrens, Aug. 5, 1942, V. R. Haber, 4 females; State College, summer 1930, R. D. Casselberry, 2 males, 1 female; Pine Grove Mills, July 26, 1942, V. R. Haber, 2 males; Philadelphia, July 8, 1928, J. C. Lutz (Lutz Coll.), 4 males, 5 females. West Virginia: Morgantown, Aug., 1923, 1 male, 3 females; Eastern Panhandle, Sept. 5, 2 males, 1 female. Ohio: Portsmouth, Aug. 27, 1915, C. J. Drake (Drake), 1 male. Illinois: Lake Forest, Girn Pond, Oct. 7, 1901 (Wash U. Coll.). 1 female; Chicago, C. T. Brues, 1 male (Parshley). Tennessee: Murfreesboro, Aug. 29, 1929, Creaser and Becker, 3 males, 25 females. Indiana: Kosciusko Co., May 2, 1932, G. E. Gould, 1 male. Michigan: Michigan (Uhler Coll.), 1 male; Washtenaw Co., Ann Arbor, April 5, 1917 (Mich. Coll.), 1 male, 1 female. Minnesota: Becker Co., Shell Lake, Aug. 22, 1922, H. B. Hunger- ford, 2 males; St. Louis Co., Aug. 14, 1922, H. B. Hungerford, 2 females; Minnesota (Bueno Coll.), 1 female. Missouri: C. V. Riley Coll., 4 males, 7 females; Columbia, April 19, 1936. Wm. M. Gordon, 1 male, 4 females; Columbia. March, 1938, R. Froeschner (Mo. Coll.), 1 male, 1 female. Mississippi: (Uhler Coll.) 1 female. Arkansas: Hope, May 3, 1926, L. Knobel (Lutz). Texas: Victoria, J. D. Mitchell (Nat. Mus.), 3 females; Texas (C. V. Riley Coll.); Colorado Co., May 2, 1922, G. O. Wiley, 1 female; Eastland Co., May 26, 1921, G. O. Wiley, 1 female; 3r^— 822 546 The University Science Bulletin Athens, Dec. 5, 1938, D. S. Millspaugh; (Uhler Colli. 1 male, 1 female. Oklahoma: Tulsa Co., March 21, 1922, G. 0. Wiley. 2 males, 1 female. Kansas: Green Co.? (Uhler Coll.), 3 males, 7 females; Cherokee Co.. Aug. 1920, H. B. Hungerford, 5 males, 12 females; Scott Co., June 21, 1925, R. H. Beamer, 5 males, 13 females; Sherman Co., Aug. 1, 1925, R. H. Beamer ,.1 male, 1 female; Morton Co., Aug. 3, 1924, C. O. Bare, 2 males, 3 females; Topeka, May 28, 1923, R. H. Beamer, 1 female; Douglas Co., Feb. 15, 1921, H. B. Hungerford, 2 females; Douglas Co., Sept. 28, 1921, Robert Guntert, 68 males, 82 females; Aug. 3, 1921, W. J. Brown, 2 males, 17 females; Doug- las Co., April, 1923, R. H. Beamer, 1 male, 6 females; Douglas Co., March 26, 1923, H. B. Hungerford, 2 males, 1 female; Douglas Co., Stubbs' Pond, April 8, 1921, H. B. Hungerford, 3 males, 12 females; Logan Co., Sept. 22, 1925, R. H. Beamer, 2 males, 7 females; Scott Co., June 22, 1925, Howard Deay, 1 female; Coldwater. June 19, 1927, H. B. Hungerford, 1 male, 2 females. Colorado: Mt. Zion Valley (Uhler Coll.), 1 female. California: (Uhler Coll.), 1 male, 1 female (label questionable). Hesperocorixa lobata (Hungerford) (Plate LXXXT, figs. 8, 8a-8c) 1925. Arctucortia lobata Hungerford, H. B. Bull, Brooklyn Ent. Soc. XX. p. 14.3. PI. VI, figs. 5 and 6 (desc. from Minn, and N. Y.). 1926. Arctocorixa lobata, Blatehley, W. S. Heteroptera of Eastern North America, p. 1069, 1071. 1928. Arctocorixa lobata, Torre-Bueno, J. R. de la. A List of the Insect.- of Xcw York, p. 141 in Cornell Univ. Agri. Exp. Sta. Memoir 101. 1936. Sigaro (Anticoriia) lobata, .Jaczewski, T. Proc. Royal Ent. Soc. Lond.in, .*cr. B, V, Pt. 2, p. 42. Size: Length 9.4 mm. to 10.5 mm. Width of head across eyes 3.1 mm. to 3.2 mm. Color: General facies medium brown. Head, limbs, and venter yellow. Pronotum crossed by about 8 regular dark bands. Dark lines of clavus fairly broad and regular. Pattern of corium more broken, the pale lineations short, more or less wavy and irregular in arrangement. Membrane in most specimens separated from co- rium by a fusion of the pale lineations; in a few cases there is no line of demarcation. Embolium yellowish white. Structural characteristics: Head about one-third length of pro- notal disk; facial hairs scanty; male fovea shallow, almost attaining eyes laterally; vertex not produced; antennal segmentation: 1:2: Western Hemisphere Corixidae 547 3 : 4 : : 31 : 20 : 60 : 40 males; 1 : 2 : 3 : 4 : : 31 : 22 : 65 : 35 fe- males. Pronotal disk with faint indication of median carina on anterior margin; apex somewhat pointed. Pronotum and hemelytra strongly rastrate. Hairs on hemelytra few. Lateral lobe of pro- thorax quadrate, apex straight, no longer than broad. Mesoepimeron narrow, osteole near the tip. Metaxyphus arrow-shaped, a little longer than broad. Front leg of male: Pala with sides subparallel, distal end almost truncate, with about 28 to 32 teeth in peg row, carina at base prom- inent; tibia with short dorsal carina bearing clump of 5 or 6 spines near distal end; femur relatively slender, with about 8 rows of stridulatory pegs on inner basal portion. Middle and hind legs slender, the segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 41.8 : 36.1 : 34.2; hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 92.5 : 130.4 : 51.8. Male asym- metry dextral. Strigil moderately large, ovate, with about 14 fairly regular combs. For details of male structures see Plate LXXXI, figs. 8, 8a, 8b and 8c. Comparative notes: The heavily rastrate pronotum and hemely- tra and the fact that the membrane is usually plainly separated from the corium, plus the male characters listed above, will serve to distinguish this species. Location of types: Holotype, allotype and four male paratypes labeled "St. Paul, Minn., Golf Club Pond, July 28, 1921, H. B. Hungerford"; two male paratypes labeled "St. Paul, Minn., Elk's Golf Ponds, July 11 and 14, 1921, H. B. Hungerford" and two male paratypes from Long Island, New York. All of these are in the Francis Huntington Snow Collections, University of Kansas. Data on distribution: (Plate LXXXIY.) Besides the types we have seen the following: U. S. A.: Maine: Orono, May 4. 1913, H. M. Parshley (Parshley Coll.), 1 male. Neil) Hampshire: Carroll, summer 1934, N. H. Peeble, 4 males, 1 female; Bath, Aug. 21, 1934, P. McKinstry, 1 male. Neiv York: Tompkins Co., Aug. 10, 1910 (Am. Mus. Nat. Hist.), 1 male; Nyack, Oct., 1896, 9 females. Massachusetts: Melrose High, April 24, D. H. demons, 2 fe- males; Springfield, G. Dimmock (U. S. N. M.), 1 female. New Jersey: Ramsey, Sept. 19, 1909, 3 males, 7 females. Rhode Island: Kingston, Nov. 11, 1909. 2 females. 548 The University Science Bulletin ■ Maryland: Cabin John, Aug. 4, 1944, R. I. Sailer (U. S. N. M.), 1 female. Georgia: Houston Co., Sept. 4, 1929, Creaser and Becker, 1 male, 1 female. Michigan: Douglas Lake, Bryant's Bog, Aug. 25, 1925, H. B. Hungcrford. 14 males, 1 female; Agricultural Col. (Bueno Coll.), 1 female. Wisconsin: Dane Co., L. Wingra, April 19, 1930, E. P. Breakey, 1 male, 1 female. Minnesota: Itasca Park, Green L., Aug. 21, 1922, H. B. Hunger- ford, 4 males, 7 females; St. Louis Co., Aug. 14, 1922, H. B. Hunger- ford, 2 males, 3 females; Minnesota (Bueno Coll.), 2 females. Hesperocorixa interrupta (Say) (Plate LXXXr. figs. 1, la-lb) 18'2,'). Corii-a interrupta Say, Thomas. ,11. Acad. Nat. Sci. Phila. IV, p. 328-329; also Coinpl. writiiifrs ed. V)y LeConte II, p. 250 (desc. from Missouri). 18.')1. Corisa interrupta, Fieber. F. X. Species Generis Corisa, p. 27, PI. II, fig. 7. (In part, the North Amer. record but not Mexico or Brazil.) 1875. Cori.ta interrupta, Uhler, P. R. Wheeler's Surv. lUOth Merid., V, p. 812. (Records Owen's Valley, Cal., and Lower Rio Grande. These are C. laevigata Uhler 1893.) 1876. Corixa interrupta, Uhler, P. R. Bull. U. S. Geol. and Geog. Surv. of Territories, No. 5, Vol. I, p. 340; also reprint separately paginated, p. 74. (In part, the Missouri, Illi- nois, New England. New York, Maryland and Minnesota (?) but not California.) 1877. Corixa interrupta, Uhler, P. R. Bull. U. S. Geol. and Geog. Surv. of Territories, \'ol. Ill, p. 454. (Reports "examples taken from Sloan's Lake on the highlands west of Denver in July by Doctor Packard and in August by myself.") I cannot find these specimens and question the determination. Probably C. laevigata Uhler 1893. 1877. Corixa interrupta, Uhler, P. R. Wheeler's Rept. Chief Eng. for 1877, p. 1332. 1878. Corisa interrupta, Uhler, P. R. Bull. U. S. Geol. Geog. Surv., p. 509. (Milk River, Mont. This is C. laevigata Uhler 1893.) 1878. Carina interrupta. Uhler, P. R. Proc. Boston Soc. Nat. Hist. XIX, p. 445. (No. 22 in Harris collection named by Mr. Say, a female correctly determined.) 1884. Corisa interrupta, Uhler, P. R. Stand. Nat. Hist. II, p. 250 art.) 1914. Arctocorisa interrupta, Parshley, H. M. Psyche XXI, p. 140 (Orono, Me.). Thi.s is H. vulgaris Hungcrford. 1917. Arctocorijtu interrupta. Parshley, H. M. Occasional Pai>ers of the Boston .Soc. Nat. Hist. Vll, p. 116. 1917. Arcfocorixd inlcrrupla , \';ni l)n/.«'e, E. P. Catalogue ipf Hemiptera . . . , p. 481 (in part). Western Hemisphere Corixidae 549 1923. Antocorisa inttrrupta, Abbott. J. F. Tlie Heniipteia or Suckint; Insects of Con- necticut, pp. 387-389, fig. 36, 1, 5, 8, in Bull. Oeol. Nat. Hist. Siirx . Hartford, Conn. XXXIV. (Records Conn.). 192.1. Arctocorixa interrupta, Hungerford, H. B. Bull. Brooklyn Ent. Soc. XX, No. 3, pp. 141-144 [-1. Iiarrisii (Uhler) not a syn.l. 1926. Arctocorixa interrupta. Blatchley, W. S. Heteroptera of Eastern North America, pp. 1068, 1069. PI. XII, fig. "). (Records Indiana but Pacific record incorrect.) 1928. Arctociirixa interrupta. Huiigerfurd, H. B. Ent. New.s, XXXIX, p. 156 (records Baker Co., Ga.). 1928. Arctocorixa interrupta. Torre-Bueuo. J. R. de la. List of Insects of N. Y., p. 141, in Cornell Univ. Agri. Exp. Sta. Memoir 101. 1929. Sigura interrupta. Lundblad, O. Ent. Tidskrift L. Hiift 1. pp. 27-29, fig. 6, 7a-h, PI. Ill, fig. 3. 1931. Sigara interrupta. Lundblad, O. Zool. Anzeiger, XCTV'I, Heft 3-4, p. 86. (Zool. Mus. in Halle, "Nordamerika Leg. Zimmerman," 1 (J . 3 $5-^ 1936. Siijara {Antirnrixa) interrupta. .Iacze\v>ki. T. Proc. Royal Ent. Soc. London, Ser. B, Vol. V, Pt. 2, p. 42. 1938. Arctororixa interrupta, Briuiley, C. S. Insects of North Carolina, p. 84. 1946. Arctocorixa interrupta. Proctor, Wm. Biol. >Surv. Mt. Desert Region Inc., Pt. VII. The Insect Fauna, p. 82 (Bar Harbor, Maine). Size: Length 9 mm. to 11 mm. Width of head across eyes 3 mm. to 3.4 mm. Color: General faeies dark. Head, limbs, and venter yellow. Pronotum crossed by 8 to 10 broad dark bands, somewhat irregular posteriorly. Clavus with broad dark bands in fairly regular series, interspersed with paler flecks. Dark bands of corium narrower and less regular. Membranal line indistinctly marked by coalescing of paler figures. Pattern of membrane slightly more broken than that of corium. Embolium silvery white. Structural characteiistics: Head about one-third the length of pronotal disk; facial hairs few; male fovea shallow, ovate, not at- taining eyes laterally; vertex rounded; antennal segmentation: 1 : 2 : 3 : 4 : : 30 : 21 • 53 : 40 (? ; 1 : 2 : 3 : 4 : : 31 : 23 : 60 : 40 2 . Pronotal disk with faint median keel on anterior margin; apex slightly pointed. Pronotum and hemelytra finely rastrate, mem- brane shining. Pruinose area of embolar groove posterior to nodal furrow about one-third the length of the embolium. Lateral lobe of prothorax quadrate, almost straight across apex, and broader than long. Mesoepimeron slender, the scent gland osteole near tip. Metaxyphus arrow-shaped, no longer than broad. Front leg of male: Pala with almost parallel sides, elongate, with 28 to 30 teeth in peg row; basal carina not prominent; tibia with dorsal carina bearing about four spines on distal end; femur mod- erately slender with a patch of about 12 rows of stridulatory teeth on inner basal surface. Middle and hind legs relatively slender, the proportion of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 45.6 : 38.9 : 42.6; hind leg: femur : tibia : 550 The University Science Bulletin tarsus 1 : tarsus 2 : : 100 : 94.6 : 127.4 : 52.8. Male asymmetry dextral. Strigil large, elongate, with about 14 fairly regular combs. For details of male structures see Plate LXXXI. figs. 1, la and lb. Comparative notes: In H. interrupta (Say) there are about 6 stout spines on the distal portion of the rear margin of the hind femur, and the head width usually exceeds 3.1 mm. which serves to separate it from H. nitida (Fieb.) which has a narrower head and about 10 spines on the distal portion of the rear margin of the hind femur. Location of types: Say described the species from "Missouri" which, in 1825, covered a lot of territory. His types are lost but a female specimen in the Harris collection was determined by Say. We are setting up a lectotype series in the Francis Huntington Snow Collections, University of Kansas, to represent this species as de- termined by Say. Data on distribution: (Plate LXXXII.) The published records, as indicated in the annotated bibliography above, cover too much territory. We have examined the following: Canada: Quebec: Montreal Island, May 30, 1903 (Wash. U. Coll.), 1 female. Ontario: Ottawa (Uhler Coll.), 1 female. U.S.A.: Maine: Peak's Isld., July 31, 1931. G. A. Moore; Orono, April 24, 1913, H. M. Parshlcy (Parshley Coll.), 1 male, 2 females. Vermont: Winooski, Aug. 30, 1901 (Davis Colli, 2 females. New Hampshire: New Haverhill, Aug. 21, 1934. P. McKinstry, 12 males, 19 females; Bath, Aug. 21, 1934, P. McKinstry, 4 males, 7 females; Bath, Aug. 21, 1934, R. H. Beamer, 3 males; Durham, Sept. 20, 1901, Osborne, 3 males, 11 females; Hampton, March 31, 1933, S. Albert Shaw; same place and collector, April 15, 1933; same place, Aug. 7, 1910; same place. May 14, 1903. Massachusetts: Forest Hills, April 24, 1921, R. F. Hussey (Hus- sey Coll.), 4 females; F. Blanchard, 1 female; Forest Hills, Sept. 14, 1914, H. M. Parshley (Parshley) ; Wellesley, 11 females; Spring- field, April 19, 1900, F. Knabb, 1 female; Woods Hole, 3 males; Wilbraham, Nov. 2, 1902, F. Knabb, 1 male, 1 female; Melrose High, D. H. demons, 13 females; Sunderland, Nov. 23, 1917, H. M. Parshley (Parshley Coll.), 2 males; Mt. Toby, Sept. 3, 1919, Priscilla Butler, 1 female; Milton, March 26, 1922, W. Clench, 6 females; Forest Hills, March 24, 1922, W. .J. Clench, 4 females; Forest Hills, 1914, H. M. Parshley (Parshley Coll.), 2 males. Western Hemisphere Corixidae 551 6 females; Amherst, Aug. 30, 1904, 2 females; Forest Hills, Sept. 13, 1911. H. M. Parshley (Parshley Coll.), 2 males, 3 females; Sher- born, Sept. 7. 1916, C. A. Frost, 2 females; Medford, May. 1869, W. N. Dale, 1 female; Brooks, March 11, 1878. 1 female; Nonames- set Island, July 7, 1911, J. F. Abbott, 15 males, 28 females. Connecticut: New Haven, Aug. 23, 1934, P. McKinstry. 2 males, 3 females; Hartford (Uhler), 1 male, 1 female (det. by Uhl. as harrisli) ; Westerley, Aug. 19, 1934, R. H. Beamer. 2 males; Litch- field, Sept. 4-10, 1924, L. B. Woodruff, 3 females; Hamden, Oct. 24, 1910, B. H. Walden, 1 male; So. Meridien. March 19, 1913, H. Johnson (Parshley), 1 female; Southington, May 21. 1910, B. H. Walden, 1 female. Rhode Island: Providence (Davis Coll.), 1 male, 4 females; Rhode Island (C. F. Baker in U. S. N. M.» ; Rhode Island (Davis Coll.), 2 females; Kingston (Davis Coll.), 2 males, 3 females; Kingston, Nov. 11, 1909 (Parshley). Neir Jersey: Orange, 2 males, 1 female; Fort Lee. July 4, 1904 (Drake); Palisades, Sept. 7, 1903 (Wash. U. Coll.), -3 males, 2 fe- males; H. Muske, 1 male, 1 female; New Jersey (Uhler Coll.), 1 male, 2 females (det. by Uhler as harrisii) ; Lake Forest, Needham, 1 female; Rancoca, Aug. 29, 1927, E. M. Beckton, 1 male, 1 female; Delair (Torre-Bueno Coll.), 2 males, 4 females; Great Piece (Torre- Bueno Coll.), 3 males, 1 female; Ramsey, Sept. 9-19. 1909. 20 fe- males; Madison, Crane (Uhler Coll.), 1 male; New Jersey (Uhler Coll.). 1 female; Riverton, Aug. 17, 1902, E. P. Van Duzee (Van Duzee Coll.). 1 male. New York: Long Island, May, 7 males, 16 females; Gowanda, Aug. 2-9, 1907, Van Duzee (Van Duzee) ; New York (Uhler Coll.), 1 male; Long Island, Queen's Village, Sept. 25, 1937, J. C. Lutz (Lutz) ; White Plains, Aug. 10, 1907 (Parshley), 1 female; Staten Isld., Aug., 1902 (Wash. U. Coll.), 1 female; Ashokan. July 30, 1909, 2 females; Nyack, Oct., 1898, 5 females; Staten Island, Aug. 5, 1916, 1 male; White Plains, Aug. 29, 1908, 1 male, 1 female; same place, Aug. 19, 1907, 1 female; Valhalla, 1 male; Ithaca, July 22, 1890, 1 male, 1 female; Ithaca, July 9, 1903 (III. Coll.) : W. Shokan. July 30, 1909 (Amer. Mus. Nat. Hist. Coll.), 1 female; White Plains, July 19, 1907 (Parshley Coll.), 4 females; Cold Springs Harbor, L. I.. July 11, 1919, H. M. Parshley (Parshley Coll.). 1 male, 3 fe- males; same place, July 26, 1920, Priscilla Butler (Husscy), 4 males, 4 females; same place, July 5, 1920, H. M. Parshley (Parshley Coll.), 1 male, 2 females; Essex Co., 4 males, 2 females; Swlas Bay. 552 The University Science Bulletin Pennsylvania: Barrens, Aug. 5, 1942, V. R. Haber, 18 males, 45 females; Pennsylvania, H. G. Klages, 2 males, 22 females; State College, summer 1930, Casselberry, 3 males, 12 females; Lehigh Gap, Aug. 11, 1904 (Drake). 1 male; Pittsburgh, Aug., 1914 (Car- negie Mus.l, 1 male; Philadelphia, July 1, 1929, J. C. Lutz rwcorixa minor (Abbott); genital capsule of male. Fig. la. Dorsal view of male abdomen. Fig. lb. Pala of male. Fig. 2. Heaperocorixa atopodonta (Himgerford) ; genital capsule of male. Fig. 2a. Donsal view of male abdomen. Fig. 2b. Pala of male. Fig. 3. Hesperocorixa nitida (Fieber) ; genital capsule of male. Fig. 3a. Dorsal view of male abdomen. Fig. 3b. Pala of male. Fig. 4. Hesperocorixa lucida (Abbott) ; genital capsule of male. Fig. 4a. Dorsal view of male abdomen. Fig. 4b. Pala of male. Fig. 5. Hesperocorixa georgiensis (Egbert); genital cap.sule of male. Fig. 5a. Dorsal view of male abdomen. Fig. 5b. Pala of male. Fig. 6. Hesperocorixa michiganensis (Hungerford) ; genital capsule of male Fig. 6a. Dorsal view of male abdomen. Fig. 6b. Pala of male. Fig. 7. Hesperocorixa ininorella (Hungerford) ; genital capsule of male. Fig. 7a. Dorsal view of male abdomen. Fig. 7b. Pala of male. Western Hemisphere Corixidae 557 PLATE LXXX HCSPEROCORlxa KIRK 558 The University Science Bulletin PLATE LXXXI Hesperoconxa Kirkaldy Fig. 1. Hesperocorixa mterrupta (Say) ; pala of male. F^G. la. Genital capsule of male. Fig. lb. Dorsal view of male abdomen. Fig. 2. Hesperocorixa harrisii (Uhler) ; pala of male. Rg. 2a. Genital capsule of male. Fig. 2b. Dorsal view of male abdomen. Fig. 3. Hesperocorixa laevigata (Uhler) ; pala of male. Fig. 3a. Genital capsule of male. Fig. 3b. Doi-sal view of male abdomen. Fig. 4. Hesperocorixa escheri (Heer); pala of male. Fig. 4a. Genital capsule of male. Fig. 4b. Dorsal view of male abdomen. Fig. 5. Hesperocorixa obliqua (Hungerford) ; pala of male. Fig. 5a. Genital capsule of male. Fig. 5b. Dorsal view of male abdomen. Fig. 6. Hesperocorixa vulgaris (Hungerford); pala of male. Fig. 6a. Genital capsule of male. Fig. 6b. Dorsal view of male abdomen. Fig. 7. Hesperocorixa martini (Hungerford) ; pala of male. Fig. 7a. Genital capsule of male. Fig. 7b. Dorsal view of male abdomen. Fig. 8. Hesperocorixa lobata (Hungerford) ; pala of male. Fig. 8a. Genital capsule of male. Fig. 8b. Dorsal view of male abdomen. Western Hemisphere Corixidae 559 PLATE LXXXI 560 The University Science Bulletin * PLATE LXXXII Western Hemisphere Corixidae 561 PLATE LXXXIII 3&— 822 562 The University Science Billetin PLATE LXXXIV Western Hemisphere Corixidae 563 PLATE LXXX^' 1a v/jtf?-) X <^\< ■^■'-« s s sa \ \ \ o D r X-A--v*V'" 4C *^^fl^\ \ ,^-' "i /_ 564 The Universltv Science Bulletin Genus Cenocorixa new Corixids of moderate size. Head with rather wide interocular space and with its anterior margin usually somewhat roundly pro- duced in both sexes. Pronotum rastrate, crossed by many brown bands and with a median longitudinal carina on anterior portion. Lateral lobe of prothorax elongate, its tip truncate to slightly rounded. Metaxyphus rather narrow. Female pala rather elon- gate. Male pala broad with a longitudinal ridge on the outside, at least on the basal half. Middle leg with claws j^lainly longer than the tarsus. Last ventral abdominal segment of female incised at tip except in (\ sorensoni n. sp. With numerous irregular, some- what anastomosing, brown figures on hemelytra which in unrubbed specimens have many more or less procumbent hairs. Genotype: .4. wileyce Hungerford. While the females of this genus ha\'e the last ventral segment incised at tip like Arctocorisa Wallengren, they are not elongate, lack the pronounced jironotal carina, and have longer claws on the middle tarsu^^. KEY TO CFJXOCOHIXA NEW GENUS 1. Males williout a stridiilar area on front femur; females with the 7th ventral abdominal segment not medianly incised C. sorensoni n. (sp. (p. Sfi.";) Males with a stridular area on front femur; females with the 7th ventral abdominal segment incised medianly 2 2. (1) With the hind femur pubescent for little more than one-third its length; right clasper of male as on Plate LXXXVII, fig. 2b C. dakofensis (Hungfd.) (p. 567) With the hind femur puliescent for more than 40 percent uf its length 3 3. (2) With the shining costal area just anterior to the nodal furrow equal in length to the middle tarsus . 4 With the shining costal area just anterior to the nodal finiow longer than the middle tarsus?; male pala with the peg row divided C. bifida (Hungfd.) (p. 569) 4. (3) With the last segment of hind tarsus deeply embrowned for its entire length ; male stricil small ; right clasper of male as on Plate LXXXVII, fig. lb. C. kuiterti n. sp. (p. 571) With hind tarsi concolorous lliroughout, or with only the tip of last segment embrowned 5 5. (4) Interocular space slightly narrower than ah eye; right clasper of male as on Plate LXXXAT, fig. 21 1 ('. amlirsoni n. Kp. (p. 573) Interocular ^|piMe (Miual to ably an error in det.) Size: Length 6.5 mm. to 7.1 mm. Width of head across eyes 2 mm. to 2.3 mm. Color: General facies medium brown. Pronotum crossed by 10 to 11 irregular, often broken, dark lines, much narrower than the pale interspaces. Claval pattern consisting of narrow transverse, often broken or furcate, dark lines basally. Pattern of distal por- tion of clavus and of corium and membrane reticulate, consisting of short, wavy, dark figures. Membrane and corium indistinctly separated by pale line. Embolium, head, legs and venter pale. Structural characteristics : Head of male about two-thirds as long as pronotal disk; interocular space greater than the width of an eye ; vertex of male considerably produced beyond eye margins, that of female slightly produced; facial hairs few in male, numerous in female; male fovea broad and deep; antennal segmentation: 1:2: 3 : 4 : : 20 : 18 : 45 : 20 5 . Pronotal disk with median carina visible on anterior third; ]H-onotum and hemelytra faintly rastrate, the latter with numerous pale hairs ; pruinose area of embolar groove posterior to tlie nodal furrow ecjual in length to that of claval suture. Lateral lobe of the prothorax elongate, sides taper- ing, tip truncate; mesoepimeron narrow with osteole near the tip; metaxyphus about as broad as long, pointed apically. Front leg of female with 14 to 16 lower j^almar hairs on pala. Front leg of male: pala broad, dorsal edge curving inward just beyond basal third, peg row broken with 12 pegs in upper apical row and 10 in lower, basal row with 2 j^egs spaced wide apart in between, a spinose tumescence at base of pala with about 10 or 12 long spines arising from it; tibia about half as long as pala, with pronounced carina which forms a curved expansion at base of pala above a small pad; femur broad at base with a large patch of about 15 rows of stridu- latory pegs on inner surface. Middle leg stout, especially the femur; hind leg relatively slender, the femur with from 4 to 6 spines Western Hemisphere Corixidae 577 on dorsal surface. On the ventral side a ridge or raised line sep- arates the pilose area from the smooth area. Comparative meas- urements of segments: Middle leg: femur : tibia : tarsus : claw :: 100 : 50.5 : 36.8 : 47.3. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 88 : 110 : 48. Male asymmetry dextral; strigil large, of about 15 irregular combs. Median lobe of seventh alxlom- inal segment large and rounded. Tip of right clasper not bifurcate. For details of male pala, abdomen and genitalia see Plate LXXXVI, figs. 4, 4a, 4b and 4c. Female abdomen with seventh ventral segment broadly incised at tip. Comparative notes: The male pala of this species is unique. See drawing on Plate LXXXVI. Location of types: Uhler described this species from two females, one from Fort Collins, June 25, at light (Baker), and the other. Spring Caiion, April 21 (Gillette). I find two specimens in the Uhler collection, a female numbered 164 and labeled ^'Corisa ex- pleta Uhl., Col." and a red "Co-type U. S. N. M." label. This I designate the lectotype. The other specimen is a male labeled '"Colo. 2022." According to Doctor Sailer this is a C. F. Baker number and is listed in notes available at U. S. N. M. as referring to Ft. Collins, Colo., July 6, 1896, collected by C. F. Baker at light. Therefore this specimen could not have been a cotype. I make it the allotype. Data on distribution: (Plate LXXXV). Canad.\: Saskatchewan: Southern Saskatchewan, Feb. 3, 1939, J. E. Moore, 1 male, 5 females; Redberry Lake, 1940, D. S. Rawson, 2 males. Manitoba: Hartney, July 31, 1937, R. H. Beamer, 1 male. U. S. A.: North Dakota: Tappen, July 23, 1937, C. L. Johnston, 1 male, 1 female; Devil's Lake, July 5, 1921, C. Thompson (Mich. Coll.), 4 males, 3 females; same place, collector and collection, July 13, 1919, 1 male, 7 females; same place, July 22, 1920, T. H. Hub- bell, 3 males, 1 female; Bettineau, Aug. 12, 1920, A. H. Eastgate, 1 male; Ramsey Co., Devil's Lake, Aug. 29, 1922, T. L. Hankinson (Exch. from Mich. Univ.), 4 males, 4 females; Ramsey Co., Devil's Lake, Aug. 29, 1922, same collector, 8 males, 22 females; Nelson Co., Stump Lake, July 23, 1919, C. Thompson, 1 male, 3 females. Colorado: (Uhler Coll.) 1 male, 1 female. 37—822 578 The University Science Bulletin Cenocorixa ivileyce (Hiingerford) (Plate LXXXVI, figs. 3, 3a-3c; wash drawing: No. 39, Plate VII) 19211. AntiKOrixa wileyi Hungeiford, H. B. Can. Ent., Vol. LVIII, pp. -271-272, PI. (jn p. 269, fig,«. 4 and 5 (desc. from Utah). 1930. Arctocoriia wileyi, Hungerford, H. B. Pan-Pac. Ent. VII, p. 26 (records fiim Oregon antl California). Size: Length 6.7 mm. to 7.8 mm. Width of head across eyes 2.1 mm. to 2.4 mm. Color: (Jeneral facies light to medium. Pronotum crossed by 12 to 14 fine, broken, overlapping and anastomosing, irregular dark lines, narrower than pale interspaces. Pattern of clavus and corium reticulate, the dark pattern consisting of short, fine, wavy Imes ir- regularly placed, and on clavus more or less transverse. Membrane and corium not distinctly separated. Embolium, head and limbs generally pale; venter pale to smoky. Structural characteristics: Head about half as long as pronotal disk; interocular space greater than the width of an eye; vertex of male, seen from above, produced beyond margins of eyes; facial hairs few; male fovea shallow but broad, attaining eyes laterally; antennal segmentation as follows: 1 : 2 : 3 : 4 : : 22 : 18 : 38 : 27 c? ; 1 : 2 : 3 : 4 : : 25 : 18 : 40 : 28 $ . Lateral angles of pro- notal disk somewhat rounded to right angled ; median carina plainly visible on anterior third; pronotum and hemclytra faintly rastrate; pruinose area of embolar groove posterior to nodal furrow equal in length to the pruinose area of the claval suture. Lateral lobe of prothorax elongate, sides parallel, tip truncate; mesoepimeron nar- row with osteole near tip; metaxyphus as broad as long, apex pointed. Front leg of female of typical shape with about 15 hairs in lower palmar row. Front leg of male: pala broad, dorsal edge bent inward at about the middle, about 33 pegs in peg row, small basally and in a nearly straight line, larger beyond middle and in a crowded, doubly curved line; outside of pala with carina on basal half; tibia about two-thirds as long as pala, with a pronounced dor- sal ridge or carina and a rounded pad; femur stout with lower margin medianly expanded, and with 10 rows of striduhitory ]iegs on inner basal surface. Middle and hind legs relatively slender; hind femur with from 4 to 6 short spines on dorsal surface; relative measurements of segments: Middle leg: femur : tibia : tarsus ; claw :: 100 : 47 : 35.6 : 38.4. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 88.8 : 111 : 51.1. Male asymmetry dextral; strigil small, of about 5 regular combs. Median lobe of seventh abdoninal Wesjern Hemisphere Corixidae 579 segment a triangular plate. Right clasper of male genital capsule not bifurcate at tip; hooklike. For details of male pala, abdomen and genitalia see Plate LXXXVI, figs. 3, 3a, 3b and 3c. Female abdomen with the incision at tip of seventh ventral abdominal seg- ment broad. Comparative notes: The male pala with the distal end of the peg row in a sigmoid curve readily separates this species from its near- est relatives. Location of types: Described from a male taken in Wasatch Mts., Utah, by Mrs. Grace Wiley, July 27, 1921. This holotype is in the Francis Huntington Snow Entomological Collection, University of Kansas. An allotype is herewith chosen from a series labeled "Grace Wiley, Emery Co., Utah, July 22, 1921." Data on distribution: (Plate LXXXV.) We have before us the following: U. S. A.: Washington: Mason Co., L. Cushman, July 12, 1919, F. M. Gaige, 2 males; Yoncalla, July 12, 1935, R. H. Beamer, 2 males. Oregon: Grant Co., Strawberry Lake, July 17, 1936, R. E. Rieder, 2 males, 2 females; North Powder, July 13, 1931, L. D. Anderson, 2 males; Boardman, July 15, 1931, same collector, 1 female; Flor- ence, July 11, 1935, R. H. Beamer, 2 males, 1 female; Worden, July 1, 1935, same collector, 5 males, 4 females; Modoc Point, July 11, 1935, same collector, 4 males; South of Worden, July 1, 1935, P. W. Oman (U. S. N. M.), 2 males, 6 females; Harney Co., June 23, 1922, E. C. Van Dyke (Cahf. Acad.). California: Mammoth Lakes, July 29, 1940, L. C. Kuitert, 8 males, 7 females; Lake Tahoe, July 11, 1940, same collector, 2 males; Bishop, July 28, 1940, same collector, 1 male, 1 female; Big Bear Lake, July 26, 1932, R. H. Beamer, 22 males, 10 females; Alpine, July 9, 1929, Beamer and Oman, 5 males, 21 females; San Diego Co., July 4, 1929, L. D. Anderson, 8 males, 1 female; same place, April 9, 1930, C. D. Martin, 3 males, 9 females; San Jacinto Mts., July 21, 1929, P. W. Oman, 1 female; Lone Pine, April 5, 1937, E. C. Van Dyke, 1 male; Bray, June 28, 1935, R. H. Beamer, 1 male; Eagle L., Lassen Co., July 31, 1921, J. O. Martin, 1 male; Franklin, March 11, 1921, B. G. Thompson, 2 females (U. S. N. M.) ; Beau- mont, Oct. 17, 1930, C. H. Hicks (Lutz) ; San Antonio Canyon, Ontario, July 25, 1907 (Drake) ; Benton, Oct. 7, 1942, P. A. Mc- Kinstry, 11 males, 1 female (taken from a hot spring, water near 580 The University Science Bueletin boiling point, all specimens dead) ; Sonora, Tiiolemne Co., Nov. 15, 1932, E. P. Van Diizee (Calif. Acad. ) . Nevada: Carson City, Aug. 9, 1929, R. H. Beamer, 1 female; Ely, Aug. 13, 1940, L. C. Kuitert, 3 males, 1 female; Reno, Oct. 1939, La R., 1 male, 1 female; Reno, Aug. 15, 1936, Owen Bryant (Bryant) ; (Uhler Coll.), 3 males, 3 females. Utah: Wasatch Co., July 27, 1921, Grace Wiley, 1 male; Emery Co., July 30, 1922, Grace Wiley, 3 males, 3 females; Duchesne, Aug. 17, 1940, L. C. Kuitert, 5 males, 2 females; Emery Co., July 22, 1921, Grace Wiley, 1 male, 2 females; same place and collector, Aug. 2, 1921, 1 male, 6 females; same place and collector. Sept 17, 1921, 1 male, 23 females; Cisco, Sept. 28, 1921, same collector, 1 male, 4 females; Eastern Utah, Sept. 28, 1922, same collector, 1 male, 2 females; Sardine Canyon, Aug. 3, 1935, C. F. Smith (Utah Exp. Sta. Coll.), 1 male, 2 females; Washington Co., St. George (Brooklyn Mus. Coll.), 2 females. Arizona: Coconimo Co.. July 1, 1929, Beamer and Anderson, 5 males, 5 females; Gila Co., Miami, July 22, 1932, R. H. Beamer, 7 males, 5 females; Kaibab Forest, Aug. 9, 1936, M. B. Jackson, 11 males, 17 females; Maricopa Co., July 1, 1929, R. H. Beamer, 1 female; Huachuca Mts., 7.000 ft., July, G. Beyer, 1 female; Coconimo Co., July 1, 1929, R. H. feeamer, 4 males, 5 females. . Neiv Mexico: Ft. Defiance (Uhler Coll.), 3 males, 1 female. Colorado: Caisson, July 1, 1931, L. D. Anderson, 1 male, 4 fe- males; El Paso, July 8, 1921, Grace Wiley, 1 female; Placer Co., 1 male. Cenocorixa utahensis (Hungerford) (Plate LXXXVn, figs. 3, 3a-3c) 1925. Arctocorixa utaheiisis Hungerford, H. B. Bull. Brooklyn Ent. .Soc, XX, pp. 22- 23, PI. II, fig. 7 (de.sc. from Utah). 1928. Arctocorixa v-tahensis, Hungerford, H. B. Can. Ent. LX, pp. 229-230 (comp. note). 1928. Arctocorixa utahensis, Hungerford, H. B. Ent. News, XXXIX, p. 156 (records from Torrence Co., N. M.). 1930. Arctocorixa ytalicnsis, Hungerford, H. B. Pan-Pac, Ent., VII, p. 26 (records Cal. at 10,500 ft. elev.). Size: Length 6.9 mm. to 7.8 mm. Width of head across eyes 2.1 mm. to 2.4 mm. Color: General facies lighter than the medium. Pronotum crossed by 9 or 10 fairly regular, sometimes broken, very narrow dark lines. Color etched away at outer edges of pronotum and along inner basal angles of clavi. Pattern of clavus and corium consisting of narrow, broken dark lines arranged in irregularly transverse Western Hemispheke Corixidae 581 series. Membrane and coriiim sometimes faintly separated by a pale line. Embolium, head, and limbs pale. Venter pale to smoky. Structural characteristics: Head about half as long as pronotal disk; interociilar space greater than the width of an eye; vertex of male, seen from above, somewhat produced beyond eye margins; facial hairs few; male fovea shallow, broad, usually not quite at- taining eyes laterally; antennal segmentation: 1 : 2 : 3 : 4 : : 25 : 18 : 45 : 27 j ; 1 : 2 : 3 : 4 : : 24 : 18 : 47 : 28 $ . Pronotal disk with median carina visible on anterior third ; pronotum and hemely- tra faintly rastrate; pruinose area of the cmbolar groove posterior to the nodal furrow equal to that of the claval suture. Lateral lobe of prothorax elongate, tip truncate; mesoepimeron narrow with osteole near the end; metaxyphus as broad as long, ai^ex pointed. Front leg of female of typical shape, with 14 or 15 lower palmar hairs. Front leg of male: pala broad, about 28 pegs in a single, curved row, dorsal edge curved inward about two-thirds of way from base, outside of pala with ridge on basal half; tibia about two-thirds as long as pala, dorsal carina pronounced, wnth a small pad; femur stout, lower margin somewhat rounded, dorsal one straight, with about 8 or 9 rows of stridulatory teeth on inner surface. Middle and hind legs slender; middle femur not spinose; hind femur with one or two rows of spines on dorsal surface; segmental proportions: Middle leg: femur : tibia : tarsus : claw :: 100 : 52.4 : 35.4 : 38.5. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 87.5 : 117.5 : 50. Male asymmetry dextral; strigil large, of 10 regular combs; median lobe of seventh abdominal segment rounded. Right clasper of male genital capsule bifurcate at tip, the processes slender. For details of male pala, abdomen, and genitalia see Plate LXXXVH, figs. 3, 3a, 3b, and 3c. Female abdomen with broad incision at tip of seventh ventral segment. C 077iparative notes: The rather large strigil of the male separates this species from C. bifida and C. kuiterti. Location of types: Described from 34 specimens taken by Grace Olive Wiley in Emery Co., Utah, in July, August and September, 1921. Holotype male, allotype female, and some paratypes in Fran- cis Huntington Snow Entomological Collections, University of Kan- sas. Paratypes in the U. S. National Museum and private collec- tions of Mrs. Grace Wiley, J. R. dc la Ton-e-Bueno and R. F. Hussey. Data on- distribution: (Plate LXXXV.) The published records 582 The University Science Bulletin are Utah, New Mexico and California. We have studied the fol- lowing : Canada: British Columbia: Windermere, Sept. 17, 1928, Owen Bryant (Bryant); Copper Mt., Oct. 11. 1928, G. S. Smith; same place and collector, Oct. 25, 1928; Brent Lake, Summerland, Oct. 29, 1931, A. N. Gartrell; Penicton, Oct. 14-22. 1931. same collector, latter four records from G. S. Walley. Alberta: Macleod, Sept. 15, 1928, Owen Bryant (Bryant); Cy- press Hills, July 21, 1930, J. H. Pepper; New Dayton, July 10, 1930, same collector; Crow's Nest Pass, Aug. 29, 1930, same collector, these three records from G. S. Walley; Banff. Aug. 10, 1925, Owen Bryant (Bryant Coll.), Imale. Manitoba: Hartney, July 31, 1937. R. H. Beamer. 1 female. U. S. A.: Oregon: So. Worden, July 1. 1935. P. W. Oman (U. S.- N. M.), 3 females. California: Sloan's Lake (Uhler Coll.). 1 male; Fresno Co., Red Lake, 10,500 ft., E. C. Van Dyke (Calif. Acad.). 2 males, 1 female. Idaho: Burlcy, July 6, 1931, L. D. Anderson. 1 male. 1 female; Snake R. (Uhler Coll.), 1 female. Nevada: Ely, Aug. 13, 1940, L. C. Kuitert. 4 males, 6 females; (Uhler Coll.), 1 female. Utah: Cisco, Sept. 28, 1921, Grace Wiley, 4 males; Emery Co., July 30, 1922, same collector, 11 males, 9 females; Eastern Utah, Sept. 28, 1921, same collector, 1 male; Wasatch Mts., July 27, 1921, same collector, 1 female; Emery Co., July 22, 1921, same collector, 1 male, 13 females; same place and collector, July 8, 1921, 2 males; same place and collector, Aug. 2, 1921, 1 female; same place and collector, Sept. 15, 1921, 6 females; same place and collector, Sept. 17, 1921, 1 male, 5 females; Beaver Canyon, July 6 (Brooklyn Mus. Coll.), 1 female; Wellsville, Aug. 16, 1934, Knowlton and Smith (Utah Exp. Sta. Coll.), 2 females; Promontory, Sept. 4, 1930, Knowlton and Janes (same collection), 1 male. Arizona: Huachuca Mts., 7,000 ft., August G. Beyer, 2 males, 1 female; Patagonia, Barnum Brown, 1 male; Bright Angel, 6,880 ft., July, Aug., 1906, Calvert (Phila. Acad.) ; Williams, Barber and Schwartz (Barber Coll.), 1 male, 1 female; Chiricahua Mts., July 5, 1940, L. C. Kuitert, 2 males, 5 females; Coconimo Co., July 1, 1929, Anderson and Beamer, 14 males, 20 females; Kaibab Forest, Aug. 9, 1936, M. B. Jackson, 2 males, 9 females; Quartzsite (Bueno Coll.), 3 males, 2 females; Flagstaff, July 8, 1941, E. L. Todd, 1 male, 6 fe- Western Hemisphere Corixidae 583 males; Miami, July 22, 1932, R. H. Bcamer, 1 male, 1 female; Yava- pai Co., Aug. 9, 1927, R. H. Beamer, 1 male; Phoenix. Tone-Bueno (Bueno Coll.), 1 female; Foxborough Ranch, Aug. 1, 1936, Owen Bryant (Bryant). New Mexico: Raton, Aug. 6, 1933, Rodeck and Jame», 1 male; Socorro. Aug. 18, 1927, P. A. Readio, 1 male; Ft. Wingate, June, 1 female; Torrence Co., summer 1925, C. A. Martin; Wagonmound, July 18. 1936, M. B. Jackson, 1 male; Santa Fe. July 20. 1936, R. H. Beamer, 10 males, 7 females; (Uhler Coll.) , 1 male; Galisteo Cr., April 1, 1932 (Lutz). Colorado: Mineral Co., Continental Divide, June 20, 1919, 1-male; Ft. Collins, May 22, 1900 (Abbott Coll.), 1 male; Hadley, Sept. 22. 1927, P. A. Readio, 1 male; Gould, Aug. 20, 1940, H. C. Sevcrin (Severinj ; Pingree Park, Aug., 1925, Beamer and Lawson, 1 male. 2 females; Las Animas Co., Aug. 22, 1927, R. H. Beamer, 4 males, 1 female; Caisson, July 1, 1931, L. D. Anderson, 4 males, 6 females; Estes Park, Mary's Lake, Aug. 22, 1919, H. B. Hunger- ford. 23 males, 24 females; Phantom Canyon. Aug., 1919, H. B. Hungerford, 1 male. 1 female; (Uhler Coll.), 1 female; Hillside, 6 mi. S.. Aug. 25, 1941, H. C. Severin (Severin). Texas: Randall Co., July 7, 1927, R. H. Beamer, 1 male. Kansa.^: Cheyenne Co., July 1, 1936, R. H. Beamer, 1 male; Thomas Co., 3,150 ft., F. X. Williams, 2 males, 2 females; Decatur Co., July 8, 1923, R. H. Beamer, 2 females; Norton Co., July 5, 1925, H. J. Grady, 1 female; Pratt Co., April 12, 1925. R. H. Beamc-. 1 female; Meade Co., 2,500 ft., F. X. Williams, 1 female; Morton Co., Aug. 3. 1924, C. 0. Bare, 1 female; Scott Co., June 22, 1925, R. H. Beamer, 1 female; Douglas Co., H. B. Hungerford, 3 females; same place, Oct. 28, 1921, Robert Guntert, 1 male, 2 females. North Dakota: L. Metagoshe, July 30, 1937, R. H. Beamer, 1 female; Tappen, July 23, 1937, same collector, 2 males, 2 females. South Dakota: Clear Lake, Aug. 11, 1939, H. C. Severin, 3 males, 3 females; Brookings Co., Lake Oakwood, Aug. 11, 1939. same col- lector, 2 males; Brookings, Gravel Pit, Sept. 11, 1939, same collector, 1 male, 4 females; Roslyn, Sept. 14, 1939, same collector. 1 male, 1 female; Webster, same date and cpllector, 1 male. 1 female; Burdette. July 20, 1937, C. L. Johnston, 1 female; Piedmont. July 17, 1937. Beamer and Johnston, 32 males, 14 females; Weta. July 18, 1937, Beamer and Peters, 8 males, 15 females; Wasta, July 17, 1937, R. H. Beamer, 2 males, 1 female; Draper, July 19, 1937, same 584 The University Science Bulletin collector. ;i males, 7 females; Pine Ridge, June 17, 1941, H. C. Severin (S. Dak.); Dixon, Jmie 14, 1940, same collector and collection; Rapid City, June 22, 1940, same collector and collection; Pickerel Lake. Sept. 14, 1939, same collector and collection; Clear Lake, Aug. 11, 1939, same collector and collection; Eureka, June 22, 1939, same collector and collection; Wessington, June 20, 1939, same col- lector and collection; Vivian, same date, collector and collection; Wood, July 23, 1939, same collector and collection; Waubay, Blue Dog Lake, Sept. 14,. 1939, same collector and collection; Weta, July 18, 1937, R. H. Beamer, 1 female; Wasta, July 17, 1937, same col- lector, 10 females; same place and date, H. T. Peters, 2 females; Draper, July 19, 1937, R. H. Beamer, 4 males, 7 females; Piedmont, July 17, 1937, C. L. Johnston, 1 female. lowo: Dickinson Co., June 29, 1940, 1 male PLATE LXXXVI Cenocorixa new genus Fig. 1. Cenocorixa blaisdcUi (Hiingerford) ; dorsal view of male abdomen. Fig. la. Genital capsule of male. Fig. lb. Right clasper of male, enlarged. Fig. Ic. Pala of male. Fig. 2. Cenocorixa andersoni n. .sp.; dorsal view of male abdomen. Fig. 2a. Genital capsule of male. Fig. 2b. Right clasper of male, enlarged. Fig. 2c. Pala of male. Fig. 3. Cenocorixa wilcyce (Hungerford) ; dorsal view of male abdomen. Fig. 3a. Genital capsule of male. Fig. 3b. Right clasper of male, enlarged. Fig. 3c. Pala of male. Fig. 4. Cenocorixa expleta (Uhler) ; dorsal view of male abdoniiii. Fig. 4a. Genital capsule of male. Fig. 4b. Right clasper of male, enlarged. Fig. 4c. Pala of male. Western Hemisphere Corixidae 585 PLATE LXXXVI 3 wieyoe (^^u^gf(J) 4 expleta {Uhl) 586 The University vScience Bulletin PLATE LXXXVII Cenocorixa new genus Fig. 1. Cenocorixa kuiterti n. yp.; dorsal view of nude abdomen. Fig. la. Genital capsule of male. Fig. lb. Right clasper of male, enlarged. Fig. Ic. Pala of male. Fig. Id. Tip of penial sheath of male genital capsule. Fig. 2. Cenocorixa dakotensis (Hungerford) ; dorsal view of male ab- domen. Fig. 2a. (ienital capsule of male. Fig. 2b. Right clasper, enlarged. Fig. 2c. Pala of male. Fig. 3. Cenocorixa utahensis (Hungerford) ; dorsal view of male abdomen. Fig. 3a. Genital capsule of male. Fig. 3b. Right clasper of male, enlarged. Fig. 3c. Pala of male. Fig. 4. Cenocorixa bifida (Hungerford) ; dorsal view of male abdomen. Fig. 4a. Genital capsule of male. Fig. 4b. Right clasper of male, enlarged. Fig. 4c. Pala of male. Western Hemisphere Cortxidae 587 PLATE LXXXVII 588 The University Science Bulletin Arctocorisa Wallengren 1894. Wallengren, H. D. J. Ent. Tidskr. XV, pp. 133, 159. [As subg. of Corisa for his C. variegata (= C. gennari Fieb.) and C. carinata Sahib.] 1898. Kirkaldy, G. W. Ent. XXXI, pp. 252-253. (^Arctocorisa Wallengren which he included in his subg. Basileocorixa.) 1901. Kirkaldy, G. W. Jl. Quekett Micros. Club, ser. 2, No. 48, p. 41. 1906. Kirkaldy, G. W. Ent. XXXIX, p. 62. (y Arctocorisa Wallengren.) 1906. Kirkaldy, G. W. Trans. Amer. Ent. Soc. XXXII, p. 152. Type carinata J. Sahib. {~y Arctocorisa Wallengren.) 1908. Kirkaldy, G. W. Can. Ent. XL, No. 4, p. 118. {^ Arctocorisa Wallengren.) 1909. Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 198. {"^ Arctocorisa Wallengren.) The expanded Arctocorisa (or Arctocorisa) of Kirkaldy has been used by Kirkaldy and Bueno 1909, Oshanin 1912, Abbott, Van Duzee, Hungerford, Lundblad, Walley, Blatchley, Parshley and others thereafter. Jaczewski 1924 says "Wallengren 1894 founded the generic name Arctocorisa for the species possessing a strigil and having the copulatoiy apparatus, directed to the right." This is not true for Wallengren in the same paper placed most of such species in what he called "Corisa B. White." Schumacher 1924 revived Sigara Fabr. and Poisson 1935 placed A. carinata and A. gennari under Sigara (Sigara) as does Stichel. Wagner 1937 treated Arctocorisa Wal- lengren as synonym of Sigara Fabr. So does China 1938. Walton 1940 restored Arcto- corisa Wallengren as a subgenus of Coriia sens. lat. 1940. Walton, G. A. Trans. Conn. Acad. Arts and Sci. XXXIII, p. 345. 1940. Hutchinson, G. E. Trans. Conn. Acad. Arts and Sci. XXXIII,. p. 415. [Corixa (Arctocorisa) kesar sp. n. and figures A. chanceae Hungfd., figs. 235-241, and A. convexa (Fieb.), figs. 228-2!34, p. 424.] 1942. Walton, G. A. Trans. Royal Ent. Soc. London (2) XCII, p. 437 [Coriia (Arcto- corixa) germari Fieber and Corixa (Arctocorisa) carinata Sahlberg]. 1943. China, W. E. The Generic Names of British Insects, Pt. 8. British Hemiptera Heteroptera, pp. 283, 306 [Corixa (Arctocorisa) carinata Sahib, and germari Fieb.]. From the above it will be observed that all of us followed Kirkaldy's expanded Arctocorisa rather than Wallengren. Walton 1940, without redefining Arctocorisa Wallengren, places it as a sub- genu.< of Corixa sens, lat., and Hutchinson, in the same paper, definitely treats Arctocorisa in the Wallengren concept. Since in the Wallengren concept both males and females can be assigned to the group, I prefer to use Arctocorixa as a genus. It contains seven species that are closely related and all of them boreal in dis- tribution, the southern extensions being at high elevations. Arctocorisa may be defined as follows: Moderately elongate species more than 7 mm. long. Pronotum moderately long with median longitudinal carina visible throughout its length and crossed by ten or more brown lines. Hemelytral pattern of broken, small irregular figures more or less reticulate except at base of clavus. Face with long hairs in both sexes, those of male often procumbent and inconspicuous. Pubescence of liemelytra very long. Meta- xyjihus narrow, iK)inted. Abdominal tergite of male markedly lobed behind the strigil. Last ventral abdominal segment of female dis- tinctly incised at tip. Anterior tibia moderately long and in the males carinate on dorsal edge. Pala elongate excejjt in A. chancem Hungerford. Logotyjie: (\ carinata Sahib. Western Hemisphere Corixidae 589 key to arctocorisa wallexgren 1. Pala of male with two rows of pegs .4. chancew Hungfd. (see p. 589) Pala of male with one row of peps 2 2. (1) Male strigil very large (see fig. 3, Plate LXXXVIII) 3 Male strigil not as above i 3. (2) Right clasper of male plainly furcate at tip A. gcrmari* (Fieber) (see p. .''>91) Right clasper of male )iot or not plainly furcate at tip .4. sulilis (Uhler) (see p. r)93) 4. (2) Male pala with iiegs widely spared in the middle of the row. .4. carinata* (Sahll).) (see p. 596) Male pala with pegs not widely spaced in the middle of the row 5 5. (4) Male pala strongly curved, the tibial carina thin. Strigil moderately large, cir- cular ; vertex prominent .4. convexa (Fieber) (see p. 598) Male pala moderately curved, the tiliial carina not thin, striyil normal 6 6. (5) Male clasper as in figure 2b, Plate LXXXVIII. Claw and tarsus of middle leg equal in length 4. lawsoiu n. up. (see p. 600) Male clasper as in figure 41i. Plate LXXX\'I11. Claw of middle leg plainly longer than tarsus - .4. planifrons (Kirby) (see p. 601) Arctocorisa chancccc Hungerford ^-' (Plate LXXXIX, figs. 1, la-Id) 1927. Arclocorixa chancei Hungerford, H. B. Annals Ent. Soc. Amer. XIX, p. 462, PI. XXXIV, figs. 2 and 5 (desc. from' Alaska). 1930. Arctoaoriia chancece, Walley. G. S. Can. Ent. LXII, No. 4, p. 77 (records Quebec, north shore of Gulf of St. Lawrence). 1930. Arctororixa chanceu, Walley, C!. S. Can. Ent. LXII, No. 12, p. 281 (repeats above records). 1931. Arctocorixa chancew. Walley, G. S. Can. Ent. LXIII, No. 10, p. 238 (from .stomach Arctic grayling near mouth CTiurchill River, Manitoba). 1940. Coriza {Arctocorisa) chanceie. Hutchinson, G. E. Trans. Conn. Acatl. Arts and Sci., XXXIII, p. 424, PI. XVII, figs. 235-241. 1943. Arctocorixa chancei, McClure, H. Elliott. Ecological Monographs XIII, p. 14 (Man- itoba, Canada. Permanent pools, eggs early June, adults early August). Size: Length 8.5 mm. to 9 mm. Wi(ith of head across eyes 2.3 mm. to 2.7 mm. Color: General facies dark. Pronotum crossed by 11 to 12 very irregular dark bands about equal in width to pale spaces. Pattern of clavus and corium reticulate, obscure, the dark color dominant over light, faintly longitudinal on corium; membrane separated from corium by a pale line. Embolium, head, and limbs pale; ven- ter black wdth pale margins. Structural characteristics: Head about half as long as the pro- notal disk; interocular space greater than width of an eye; vertex of male conically produced beyond eye margins; face moderately hairy in both sexes; male fovea well defined, broad and deep; an- * Not American. 590 The University Science Bulletin tennal segmentation : 1 : 2 : 3 : 4 : : 28 : 19 : 45 : 38 ^ ; 1 : 2 : 3 : 4 : : 28 : 20 : 48 ; 38 $ . Pronotal disk with pronounced me- dian carina on anterior half but visible throughout; tip of disk pointed; pronotum and hemelytra moderately rastrate, the latter with a few pale hairs; pruinose area of embolar groove posterior to nodal furrow equal in length to that of claval suture. Lateral lobe of prothorax about two-thirds as broad at base as long, sides taper- ing, apex truncate; mesoepimeron narrow with ostcole near the tip; raetaxyphus about as broad at base as long, but sides abruptly tapering to a narrow point. Front leg of female: pala and tibia of usual shape; femur hairy at base for only one-fourth its length and with a row of stout spines extending from apical edge of pilose area to apical margin of femur. Front leg of male: pala broadest at base, tapering to point apically ; pegs in two rows, basal row of 12 pegs lying close to upper palmar row of bristles, apical row of 17 pegs lying along dorsal margin, two or three pegs in middle, con- necting the two rows; small carina at base of pala on dorsal mar- gin; tibia about three-fourths as long as pala, with pronounced dorsal carina and a pad; femur relatively slender with about six rows of stridulatory pegs on inner surface and a row of stout spines extending from these pegs to apical margin of femur. Middle and hind legs relatively slender; middle femur not spinose; hind femur with row of short spines on dorsal surface; compai-ative measure- ments of segments as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 45.8 : 32.7 : 32.7. Hind leg: femur : tibia : tar- sus 1 : tarsus 2 : : 100 : 88.8 : 145.5 : 51. Male asymmetry dex- tral; strigil large, suboval, of about 17 irregular combs; right clasper of genital capsule bifurcate at tip, processes slender. For details of male pala, abdomen, and genitalia see Plate LXXXIX, figs. 1, la, lb and Id. Female abdomen with seventh, ventral seg- ment incised at tip as in Plate LXXXIX, fig. Ic. Comparative notes: This is the only species in the genus with two peg rows in the male pala. The female has broader lobes of the seventh ventral abdominal segment and a deeper, narrower median incision. Location of types: Described from one male taken in Kobuk River, Noorvik, Alaska, Aug. 6, 1925, by P. Scott. Holotype in the Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate XC.) Mr. Walley has reported this Western Hemisphere Corixidae 591 from the provinces of Quebec and Manitoba, Canada. We have the following: Alaska: Noorvik, Kobuk R., Aug. 6, 1925, P. Scott, 1 male (the type). Canada: Manitoba: Churchill, Feb. 9, 1937, D. G. Denning, 2 females; Lake Isabella, Churchill, June 9, 1936, H. E. McCkire, 2 males. Quebec: Watshishu, June 18, 1929, W. J. Brown, 1 male. Newfoundland: Via Walton, 4 males, 1 female. Arctocorisa germarii (Fieber) (Plate LXXXVni, figs. 3, 3a-3c) 1848. Corisa germarii Fieber, F. X. Bull. Soc. Imp. des Nat. Moscou, XXI, Pt. 2, p. 531 ("Aus Sachsen. Unalascbka," a mixed lot). 1851. Corisa germarii, Fieber, F. X. Spccie.s Generis Corisa . . . , p. 38, PI. II, No. 26. 1860. Corisa germarii, Fiel)er, F. X. Europ. Hemiptera, p. 99. 1876. Corixa germarii, Uhler, P. R. Bull. U. S. Geol. and Geog. Surv. Terr., No. 5, Vol. I, p. 341 ; also reprint of above separately paginated p. 75 (quotes Fieber). 1879. Corisa. germarii, Puton, A. S\nopsi.'; des Hem.-Het. de France, 1, p. 234 (taken from Van Duzee Catalogue). 1898. Corixa germari, Kirkaldy, G. W. Ent. XXXI, pp. 249-251 (gives syn. and com- pares with C carinata Sahib.). 1900. Corisa germarii, Heidemann, O. Proo. Wash. Acad. II, p. 506 (records 4 $ $ > 5^5 from Popof Isl. and quotes Fieber). These are A. sutilis (Uhl.). 1901. Corixa {Arctocorisa) germari, Kirkaldy, G. W. Jl. Quekett Micros. Club, ser. 2, VIII, No. 48, p. 43 (figs, male pala). 1909. Arctocorisa germari, Kirkaldy, G. W., and Tbrre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, 1908, p. 195 (not the Alaska record). 1917. Arctocorixa germarii. Van Duzee, E. P. Catalogue of Hemiptera . . . , p. 480 (not Alaska record). 1923. Arc-tocori4 nun. to 8 mm. and Macon says 7.5 mm. to 10 mm.; therefore, my specimens must be nniisuMlly small. Western Hemisphere Corixidae 593 femur : tibia : tarsus : claw :: 100 : 49.2 : 37.2 : 42.6. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 91 : 122.1 : 44.4. Male asymmetry dextral ; strigil large, suboval, of about 12 to 14 irregular combs. Right clasper of male genital capsule forked at tip. For details of abdomen and genitalia see Plate LXXXVHI, figures 3a, 3b and 3c. Comparative notes: The American record of this species no doubt is an error and applies to A. sutilis (Uhler). These species may be separated by the key and the figures on Plate LXXXVHI. Location of types: Fieber studied material from Germar's col- lection and AIus. Berlin from Unalaschka which I did not locate in the European museums I visited, nor did I find any specimens from Sachsen which should be the types. Data on distribution: In the Snow Collections we have only the following specimens : England: Brackenben, Westmoreland, April 21, 1928. F. H. A. (Exchange Hugh Jones, Nottingham, England), 2 males. For jiublished records see Lundblad, Poisson, etc. Arctocorisa sutilis (Uhler) (Piste LXXXIX, figs. 2, 2a-2c, 3, 3a-3d) 187G. Corixa sutilis Uhler, P. R. Bull. U. S. Geol. Geog. Siirv. I. p. 339; also reprint of above, sop. iiaeinated, p. 73. (Collected in mts. of Colorado by Lt. Carpenter, July to September. ) 1877. Cinixa ^utilU. Uhler. P. R. Bull. U. S. Geol. Geog. Surv. Ill, p. 433. (Sloan's Lake, highlands west of Denver, August 5.) 1877. Corisa sutilis, Uhler, P. R. in Wheeler's Report Chief Eng. for 1877, p. 1332. (Plains of northern New Mexico. October, Lt. W. L. Carpenter.) 1878. Corisa sutilis, Uhler, P. R. Bull. U. S. Geol. Geog. Surv. IV, p. 509. (Standing water, Milk River region, Montana.) 1893. Coma sutilis. Uhler, P. R. Proc. Ent. Soc. Wash. II, p. 384. (3 spec, Alta, Utah, 10,000 It.) 189.i. Corisa sutUis, Gillette, C. P., and Baker, C. F. Hemiptera of Colo.. Colo. Agri. Exp. Sta. Bull. 31, Tech. Ser. 1, p. 64. (Quotes Uhler.) 1900. Corisa convexa, Heidemann, O. Proc. Wash. Acad. II. p. 506. (Records Popof Isl. and Berg Bay.) 1909. Arctocorisa sutilis. Kirkaldy, G. W., and Torre-Bueno, J. R. dn la. Catalogue In Proc. Ent. Soc. Wash. X, p. 197. 1917. ArcftHorira sutilis. Van Du^ee, E. P. Catalogue of Heniipt<»ra . . . .p. 484. Size: Length 7.4 mm. to 9.8 mm. Width of head across eyes 2.4 mm. to 3.1 mm. Color: General facies medium brown. Pronotum crossed by 10 to 12 very irregular and broken dark bands about half as w^de as pale interspaces. Claval pattern reticulate, the dark color dominant on distal portion. Corial pattern of short, broken lines of dark and light, arranged in longitudinal series. Membrane separated from 38—822 594 The University Science Bulletin corium by pale line; pattern reticulate and as dark a^ that of rest of hemelytra. Embolium, head, limbs and thoracic venter pale; abdominal venter smoky with pale margins. Structural characteristics: Head about half as long as pronotal disk; interocular space greater than width of an eye; vertex of fe- male rounded, that of male produced very slightly beyond eye mar- gins; facial hairs few to moderately numerous in both sexes; male fovea moderately broad and fairly deep; antennal segmentation: 1 : 2 : 3 : 4 : : 28 : 23 : 53 : 35 ^ ; 1 : 2 : 3 : 4 : : 30 : 26 : 57 : 35 2 . Pronotal disk with pronounced median carina plainly visible for almost its entire length; disk pointed or rounded apically; pro- notum and hemelytra moderately rastrate, the latter with numerous pale hairs, especially on corium; pruinose area of embolar groove posterior to nodal furrow equal in length to that of claval suture. Lateral lobe of the prothorax about two-thirds as broad at base as long, tip truncate, sides almost parallel; mesoepimeron narrow with osteole near its tip; metaxyphus about as broad at base as long, tip narrow and pointed. Front leg of female of usual shape. Front leg of male: pala long and slender with 37 to 42 pegs in a single, unbroken row; dorsal edge of jiala carinate at base, curved inward just beyon<^i basal third; tibia about half as long as pala, dorsal carina not thin, extending nearly to base, pad long and narrow; patch of bristles at apex just below pad; femur moderately slender with patch of about 10 rows of stridulatory pegs on inner surface. Middle and hind legs long and slender; middle femur somewiiat spiny. Segmental proportions: Middle leg: femur : tibia : tar- sus : claw :: 100 : 49.4 : 36.8 : 36.8. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 92.5 : 138.8 : 55.5. Male asymmetry dextral; strigil very large, ovoid, of about 20 to 24 irregular combs. Right clasper of genital capsule slightly bifurcate at tip as in Plate LXXXIX, figs. 3a and 3b, and as in 2a and 2b. For details of male ])ala and abdomen see Plate LXXXIX, figs. 3 and 3d. Female ab- domen with seventh ventral segment incised at tip as in Plate LXXXIX, fig. 3c or 2c. Comparative notes: This is our largest American Arctocorisa, being somewhat broader than .4. convexa (Fieb.). Location of types: In the Uhler collection of the U. S. National Museum there are three cotypes, 2 males and 1 female. I selected one of the males as the lectotype and have shown its structure on Plate LXXXIX. figs. 3, 3a, 3b and 3c. Because we had specimens, Western Hemisphere Corixidae 595 from various places, which were somewhat smaller with the right genital clasper lacking the subapical flap, as in figures 2b and 2c, I assumed we had a subspecies. However, I dissected the other male cotype to find that its right clasper was also like figures 2b and 2c. I* conclude, therefore, that the males of this species are dimorphic in this character and find that the females also show some dimorphism as indicated on Plate LXXXIX. Since both forms have been taken at the same time and place on some occa- sions, it seems obvious that they are not to be distinguished as sub- species. Data on distribution: (Plate XC.) The published records include Colorado, Montana, Utah, New Mexico and British America. We have examined the following: Canada: Northwest Territories: Great Slave Lake, Outpost Isl., Sept. 6, 1945, D. S. Rawson, 3 males, 3 females, ^ nymphs; same place and collector, Aug. 28, 1945, 1 male, 2 females. Alberta: S. W. Alberta, Lonesome Lake, June 21, 1937, via D. S. Rawson, 4 females; same place and collector, June 12, 1938, 1 male, 2 females*; Edmonton, Aug. 7, 1915, E. H. Strickland, 1 male* (Can. Coll.); Peace River, Aug. 11, 1915, same collector, 1 male* (Can. Coll.). Manitoba: Aweme, April 22, 1915, N. Criddle, 1 female* (Can. Coll.). U. S. A.: Ala.ska: Kochak, Sept. 10, 1919, Jasper S. Hine, 1 male, 3 females; Popof Island, 4 males, 6 females;* Popof Island, 'T. Kinkaid (Harriman Exp. 1899, U. S. N. M.), 1 female; * Berg Bay, June 10, 1899, same collector (Harriman Exp. 1899, U. S. N. M.), 1 female.* Montana: Uhler Coll. 1 male; Anaconda, Aug. 12, 1931, L. D. Anderson, 1 male.* Wyoming: Grand Teton Nat'l Park, Aug. 18, 1931, L. D. Ander- son, 1 male, 2 females, also 1 male, 1 female; * Boulder, Aug. 19, 1931, same collector, 1 male.* Colorado: Uhler Coll. 1 female and cotypes mentioned above; Pingrce Park, Aug. 1925, Beamer and Lawson, 1 male, 3 females; also 6 males, 2 females;* Cameron's Pass, Aug. 20, 1940, L. C. Kuitert, 5 males, 4 females;* nr. Cameron's Pass, Pot Hole, alt. 10,000 ft., 3 mi. w. of divide, Aug. 20, 1940. H. C. Severin, 3 females; Gould, fish pond. 9,250 ft., Aug. 20, 1940, same collector, 5 males. * These are like figures 2, 2a, 2b and 2c on Plate LXXXIX. 596 The University Science Bulletin Arctocorlsa carinata (Sahlberg) (Plate LXXXVIII, figs. 1, la-Id and wash drawing 50, Plate VII) 1819. Corixa carinata Sahlberg, Corolo R. Dissertatio Academica ; Ob.?ervationes Qiias- dam Historian! Notonectidum, Imprimis Fennicarum Illustrantes . . . Aboae p. 12. (Desc. "Ad Yliine, Nygard.") For some other references before 19*2o see Lundblad Ijelow who omits many entries includ- ing some of his own. 1925. Arctocoriza carinata, Lundblad, O. Ent. Tiilskrift XLVI. Haft 2, pp. 127-142, text figs. 1, 2 and 3, PI. IV. 1930. Arctocorisa carinata. Jones, H. P. Entomologists' Record, XL-XLII; reprint, p. 76. 1931. Sigara carinata, Lundblad. O. Zool. Anzeiger, XCVI. Haft 3--f, p. 87. (Compares type of C. convexa Fieber from Halle with it.) 1932. Corixa carinata, Lindbers, Hakau. MtMiHjranda .'>ocie' atis- pro Fauna et Flora Fen- nica, 7, 1930-1931. 1935. Sigara (Sigara) carinata, Poisson, R. Archives de Zool. Exp. et Gen., LXXVII, p. 548, figs. 70, 71, 72. (An Alpine species.) 1935. Siqara (Sgara) carinata. Stichel, W. Illustrierte Bestimmungs Tabellen der Deutschen Wanzen. Lief. 11, pp. 328-329, figs. 838-841; also Lief. 12, p. 332. 1936. Arctocoriia carinata, Walton, G. A. Ent. Month. Mag., Ser. 3, LXXII, p. 20. 1936. Sigara (Sigara) carinata, Poisson, R. Bull, de la Soc. Sci. de Bretagne XIII, fasc. 1 and 2, p. 9. 1936. Sigara carinata, Lundblad, O. Ent. Tidskrift, Hiifte 1, p. 61. (Ecological notes.) 1938. Sigara (Sigara) carinata. China, W. E. Ent. Mo. Mag., LXXIV, p. 39. 1939. Sigara carinata, Macon, T. T. Freshwater Biol. Assoc. British Empire Scientific Publ. No. 1. Key to British Species of Corixidae, p. 12, fig. 15A, 21Q and 22R. 1942. Corixa (Arctocorixa) carinata. Walton, G. A. Trans. Royal Ent. Soc. London, XCII, No. 2, p. 437. (Hebrides.) 1940? Corixa carinata. Brown, E. S. Trans. Dumf. and Galloway Nat. Hist, and Anti- quarian Soc. XXIII, p. 7. Size: Length 7.1 mm. to 8.1 mm.* Width of head across eyes 2.2 mm. to 2.6 mm. Color: General facies medium to dark. Pronotum crossed by 11 to 12 irregular dark bands a little wider than pale interspaces. Pat- tern transverse at base of clavus, reticulate and in faintly longitu- dinal series elsewhere. Corium and membrane separated by a pale line. Embolium silvery white, head and limbs yellow, venter dark with yellow margins. Structural characteristics: Head about two-thirds as long as pro- notal disk; interocular space greater than width of an eye; vertex of male i>roduced beyond margins of eyes as seen from above; faces moderately hair>' in both sexes; male fovea broad, fairly deep, well defined; antennal segmentation: 1 : 2 : 3 : 4 : : 24 : 18 : 48 : 38 c? ; 1 : 2 : 3 : 4 : : 25 : 20 : 50 : 38 $ . Pronotal disk with pro- nounced median carina on anterior half but visible throughout; tip of disk rounded; pronotum and hemelytra coarsely rastrate, the latter thickly covered with long, pale hairs; pruinose area of em- bolar groove posterior to nodal furrow equal in length to that of claval suture. Lateral lobe of prothorax about three-fourths as * Our specimens must be small for Macon says "8 to 10 mm." Western Hemisphere Corixidae 597 broad at base as long, sides tapering, tip truncate; mesoepimeron narrow with osteole near tip; metaxyphiis long and slender. Front leg of female: pala and tibia of typical shape; femur with pilose area at base covering about one- fourth of inner surface and with an irregular row of stout spines extending from edge of pilose area almost to apical margin of femur. Front leg of male: pala with dorsal edge sharp and curving inward about one-fourth of way from base; pegs spaced wide apart in middle of row, about 38 pegs in all, carina at base on dorsal side; tibia with sharp dorsal carina and a pad; about one-half as long as pala; femur relatively stout, margins tapered, with a row of stout spines on inner surface and a patch of about 8 rows of stridulatory pegs on inner surface near base. Mid- dle and hind legs slender; middle femur not spinose; hind femur with row of short spines on dorsal surface; comparative measure- ments of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 46 : 34.5 : 34.5. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 93.8 : 122.4 : 51. Asymmetry of male dextral; strigil of moderate size, rounded, of 8 to 10 irregular combs. Right clasper of genital capsule bifurcate at tip, the processes slender. For details of male pala, abdomen and genitalia see Plate LXXXVIII, figs. 1, lb, Ic and Id. Female abdomen with seventh ventral segment broadly incised. See Plate LXXXVIII, fig. la. Comparative notes: See Lundblad's splendid paper of 1925 to dis- tinguish this Euroix^an species from A. gertnari (Fieber). Location of types: Horn says the collections of C. R. Sahlberg are in the Zool. Mus. Univ., Helsingfors, Finland. Data on distribution.: See Lundblad, Poisson. etc. We have be- fore us the f olloudng : Iceland: North Iceland, Sept. 16, 1940, Wm. P. Palsson, 4 males, 8 females, 3 nymphs; also Sept. 28, 1 male; Laxardal, July 11, 1941. Wm. P. Palsson, 3 males, 3 females, 2 nymphs; same, July 16, 17 males, 32 females; same, July 21, 12 males, 10 females; same, July 23, 8 males, 11 females; same, Sept. 6. Faeroes Islands: Thorshavn, April 13, 1925, 4 males, 2 females. Scotland: 2 males, 1 female. England: Sticks Pass 1, Lake District, Sept. 4, 1936, 1 male, ] female, Sweden: 1 male. Finland: Tvarminne, Listo, July 14, 1920, Hakan Lindberg. 4 males, 2 females. 598 The University Science Bulletin Russia: Arekcangpobck Mypman ozepo, Nov. 15, 1923. Bavaria: Ampero See 2215 m., 2 males, 2 females. Austria: Alps. Col. de Balme, 1 male, 3 females. Arctocorisa convexa (Fieber) (Plate LXXXIX, figs. 4, 4a-4d) 1851. CorUa convexa Fieber, F. X. Species Generis Corisa. p. .37, Tab. II, fig- 23. (Desc. from Labrador.) 1900. Corisa convexa, Heideiuann. O. Proc. Wash. .^cad. II, p. -JOn. (Records 859 Popof Isl. and Berg Bay.) These are A. sutilis (Uhler). 1909. Arctocorisa convexa, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. Soc. Wash. X, p. 184. 1917. Arctocorixa cbnvexa. Van Duzee, E. P. Catalogue of Heuiiptera . . . , p. 479. 1926. Arctocorixa convexa, Blatchley, W. S. Heteroptera of Eastern N. A., p. 1072. 1930. .Arctocorixa convexa, Walley, G. S. Can. Ent. LXII, pp. 77-79, PI. X. (Desc. the male. Studied specimens from Quebec and Labrador.) 1930. Arctocorixa convexa, Walley, G. S. Can. Ent. LXn, p. 281. (From Quebec. Re- ports five places.) 1931. S'fiara conicxa. Lundblad. O. Zool. Anzeiger, XCVI, Heft 3-4, p. 87. (Examined 5 type from Halle Mus.) 1931-. Arctocorixa convexa. Walley, G. S. Can. Ent. LXIII, p. 238. (From stomach of arctic grayling, Churchill River, Man.) 1936. Arctocorixa convexa, Walley, G. S. Can. Ent. LX\"III, p. 62. (Records Alberta and British Columbia.) 1940. Corixa (.Arctocorisa) convexa, Hutchinson, G. E. Tran.«. Conn. Acad. Arts and Sci. XXXIII, p. 424, figs. 228-234. 1943. Arctocorixa convexa. McClure, H. Elliott. Ecol. Monographs XIII, p. 14. (From Churchill area, Manitoba. Permanent pools; eggs in early June; new adults first of August.) Size: Length 9.2 mm. to 10 mm. Width of head across eyes 2.7 mm. to 2.9 mm. Color: General facies medium to dark. Some specimens are red- dish brown (Labrador) ; others are chocolate brown. Pronotum crossed by 12 to 13 very irregular dark bands no wider than pale spaces. Pattern of clavus and corium reticulate, the dark colora- tion tending to coalesce along hemeljy'tral suture. Corium and membr9,ne separated by pale line. Embolium, head, and limbs pale; venter black with pale borders. Structural characteristics: Head about half as long as pronotal disk ; interocular space greater than width of an eye ; vertex of male prominent, roundly produced beyond eye margins as seen from above and forming a sharp ridge as seen from lateral view; male fovea broad and deep, well-defined; antennal segmentation: 1:2: 3 : 4 : : 30 : 21 : 50 : 38 ^ ; 1 : 2 : 3 : 4 : : 30 : 20 : 50 : 38 5 . Pronotal disk with pronounced median carina on anterior two- thirds but visible throughout; disk pointed apically; pronotum and hemelytra moderately rastrate, the latter with numerous pale hairs; pruinose area of embolar groove posterior to nodal furrow equal in Western Hemisphere Corixidae 599 leiigth to that of the claval suture. Lateral lobe of the prothorax about two-thirds as broad at base as long, sides tapering, tip trun- cate; mesoepimeron narrow with osteole near the tip; metaxyphus as broad as long, but with sides abruptly tapering to narrow, pointed tip. Front leg of female as in other Arc^ocoma. Front leg of male: pala with dorsal edge strongly curved just before middle, about 38 teeth in peg row, short carina at base on dorsal margin; tibia about one-half as long as pala with dorsal carina thin and sharp and with small, wedge-shaped pad; femur slender, sides nearly parallel, with patch of about 8 or 10 rows of stridulatory pegs. Middle and hind legs slender. Middle femur not spinose, hind femur with short row of short spines on dorsal surface; comparative measurements of segments: Middle leg: femur : tibia : tarsus : claw :: 100 : 50 : 34.8 : 34.8. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 95.6 : 132.3 : 47.3. Male asymmetry dextral, strigil moderately large, circular, of 16 to 20 very irregular combs. Right clasper of genital capsule bifurcate at tip, the processes slender and short. For details of male structures see Plate LXXXIX, figs. 4, 4a, 4b and 4d. For female abdomen see Plate LXXXIX, fig. 4c. Comparative notes: The prominent vertex of the male is abruptly produced beyond the margin of the eyes and distinguishes this spe- cies from other American species. Location of types: The female type is in the Zool. Museum at Halle, Germany. It has been studied by Lundblad and by me. The male described by Walley should be the allotype and is in the Canadian Collection. Data on distribution: (Plate XC.) Published records include Labrador, Quebec, Manitoba, Alberta and British Columbia. We have before us the following: Canada: Labrador: W. Turnavik, July 6, 1940, Sam Bartlett (U. S. N. M.), 1 female; same place, fresh water lakes, July 14, 1937, Wilcox and Nutt, 1 male, 2 females; same place, July 16, 1938, D. C. Nutt, 1 female; Cape Charles, 3 males, 8 females; Red Bay, 2 males, 4 females; W. St. Modest, 1 male, 1 female; Great Whale R., James Bay, Aug. 12, 1935 (Carnegie), 1 female; Grey Goose Isld., James Bay, Sept. 12, 1919, W. E. Walton,! male. Newfoundland: ' (via Walton) 2 males. Quebec: Bradore Bay, July 29, 1930, W. J. Brown, 1 male, 1 female. 600 The University Science Billetin $ t Manitoba: Churchill, June 9, 1936, H. E. McClure. 3 males, 4 females. "'; Bering hlmd: 1882-'83, S. Steineger (U. S. N. M.), 1 male. i ; ■ Arctocorisa lamsoni n. sp. i . . (Plate LXXXVIII, figs. 2, 2a-2d) Size:'' Length 8.5 mm. to 8.9 mm. Width of head across eyes 2.6 mm. to 2.7 mm. Color: General facies dark. Pronotum crossed by 12 to 14 nar- row, dark, irregular bands, about half as wide as pale spaces. Claval pattern transverse at base, vermiculate elsewhere. C'orial pattern reticulate, the dark color dominant over the pale. Corium and membrane separated by pale line. Embolium, head, limbs, and ab- dominal venter pale; thoracic venter smoky to black with pale margins. Structural characteristics: Head about half as long as pronotal disk; interocular space greater than the width of an eye; vertex of male, as seen from above, only slightly produced beyond eye mar- gins; faces moderately hairy in both sexes; male fovea broad and deep ; antennal segmentation : 1 : 2 : 3 : 4 : : 25 : 20 : 47 : 37 ^ ; 1 : 2 : 3 : 4 : : 28 : 20 : 47 : 37 $ . Pronotal disk with pronounced median carina on two-thirds its length but visible throughout ; apex pointed; pronotum and hemelytra moderately rastrate, the latter with a few pale hairs; pruinose area of the embolar groove posterior to nodal furrow equal in length to that of the claval suture. Lateral lobe of the prothorax about half as broad at base as long, sides nearly parallel, tip truncate; mesoepimcron narrow with osteole near tip; metaxyphus as broad at base as long, sides abruptly taper- ing to sharp point. Front leg of female of usual shape. Front leg of male: pala long and slender, dorsal edge curved inward at the middle, small carina on dorsal surface near base, 40 pegs in a slightly curving row, apical ones quite long; tibia about half as long as pala, dorsal carina not extending clear to base and not thin, pad oval in shape; femur relatively slender,; broader at base, sides tapering, with a patch of aoout 10 rows of stridulatory pegs on inner sur- face. Middle and hind legs long and slender. Segmental propor- tions: Middle leg: femur : tibia : tarsus : claw :: 100 : 48-8 : 35 : 35. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 89.9 : 119.1 : 66.4. Male asymmetry dextral; strigil almost square, of 11 to 12 irregular combs. Median lobe of seventh abdominal segment rather large and rounded distally. Right clasper of male genital Western Hemisphere Corixidae 601 capsule bifurcate at tip, the processes short and slender. For details of male structures see Plate LXXXVIII, figs. 2, 2b, 2c and 2d. Sev- enth ventral abdominal segment of female notched at tip as in Plate LXXXVIII, fig. 2a. Comparative notes: This species, while near A. planifrons (Kirby), is separable not only by the characters in the key but by the less produced vertex in the males. Location of types: Described from male holotype, allotype and 46 paratypes (24 males, 22 females) labeled "Pingree Park, Colo., Aug. 25, Beamer and Lawson." These are in the Francis Hunting- ton Snow Entomological Collections, University of Kansas. Data on distribution: (Plate XC.) Wyoming: Two-gwo-tee Pass, Aug. 28, 1926, G. Cady, 2 males, 1 female. Colorado: Pingree Park, Aug., 1925, Beamer and Lawson, 27 males, 23 females; same place, Aug., 1924, Beamer, 6 males; W. Boulder Co., Lily Lake, nr. Science Lodge, June 28, 1938, Helen Rodeek, 1 female; same place, Junis Lake, nr. Science Lodge, July 2, 1940, U. N. Lanham, 1 male, 3 females; same place, Gyranlus L., nr. Science Lodge, June 26, 1940, Lutz and Lanham, 1 male, 1 fe- male; nr. Cameron Pass, pot hole, Aug. 20, 1940, H. C. Severin (Scvcrin), 1 male; Gould, fish pond, 9,250 ft., same place, collector and collection, 1 male. Arctocorisa planifrons (Kirby) (Plate LXXXVIII, figs. 4, 4a-4d) 1837. Corixa planifrons Kirby, \Vm., in Fauna Boreali Americana by John Richardson, Pt. 4, p. 284 ( 5 5 ). 1837. Conia carinata, Kirby, Wm., in Fauna Boreali Americana, Ft. 4, p. 284 ( 5 $ ). 1851. Corixa planifrons, Fieber, F. X. Species Generis Corisa, pp. 43-44 (quotes Kirby). .1851. Corisa kirbyi Fieber, F. X. Species Cieneris Corisa, p. 43. 1878. Corixa planifrons. Kirby, i» C. .1. S. Bethune's reprint of Kirby's species. Can. Ent. X, p. 216. 1892. Carina planifrons, Harrington, W. H. Ottawa Nat. VI, p. 30. 1909. Arctocorisa planifrons, Kirkaldy. G. W.. and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. See. Wash. X, p. 196. 1926. Arctororixa planifrons, Blatchley, \V. S. Heteroptera of Eastern North America, pp. 1068. 1073. Size: Length 8 mm. to 8.6 mm. Width of head across eyes 2.4 mm. to 2.6 mm. Color: General facies medium. Pronotum crossed by 9 to 10 narrow, irregular dark lines, about half as wide as pale interspaces. Pattern of clavus and corium reticulate, about equally distributed between light and dark; membrane and corium separated by a pale 602 The University Science Bulletin line. Embolium, head, and limbs pale; venter smoky with pale margins. Structural characteristics: Head about half as long as pronotal disk; interocular space less than width of an eye; vertex of male rounded out beyond eye margins as seen from above, male fovea broad and deep; faces relatively hairy in both sexes; antennal seg- mentation: 1 : 2 : 3 : 4 : : 26 : 19 : 45 : 30 J ; 1 : 2 : 3 : 4 : : 28 : 19 : 48 : 32 5 . Pronotal disk with pronounced median carina for almost its entire length; disk rounded apically; pronotum and hem- elytra moderately rastrate, the latter covered with pale hairs; prui- nose area of embolar groove posterior to nodal furrow ecjual in length to that of claval suture. Lateral lobe of prothorax about half as broad at base as long, sides tapered slightly, tip truncate; mesoepimeron narrow with osteole near the tip ; metaxyphus a little longer than broad, sides tapering to narrow tip. Front leg of female as in other Arctocorisa. Front leg of male: pala long and narrow, dorsal edge moderately curved inward, no carina at base on dorsal edge, about 34 pegs in a single, slightly curving row; tibial carina pronounced but not thin, pad small and somewhat wedge-shaped, tibia about half as long as pala; femur slender, sides nearly parallel, with a patch of about 12 rows of stridulatory pegs on inner surface. Middle and hind legs slender, middle femur not spinose, hind femur with short row of small spines on dorsal surface; comparative measurements of segments: Middle leg: femur : tibia : tarsus : claw : : 100 : 49.6 : 36.4 : 41.4. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 98.6 : 129.9 : 55.4. Male asymmetry dextral, strigil small, oval, of 8 irregular combs. Right clasper of genital- capsule bifurcate at tip, the processes short and slender. For further details of male structures see Plate LXXXVIII, figs. 4, 4b, 4c and 4d. Seventh ventral segment of female abdomen incised at tip as in Plate LXXXVIII, fig. 4a. Comparative notes: This is the only American species of Arcto- corisa s. str. wherein the claw of the middle leg is plainly longer than the tarsus. Location of types: Unknown. IVIr. China says it is not in the British Museum. Kirby's types were taken by Richardson's survey party at latitude 65° and probably in the neighborhood of Great Bear Lake. Kirby, who wrote the report concerning the insects taken on the Northern Land Expeditions under the command of Captain Sir John Franklin, lists Corixa striata, Corixa carinata and Corixa plani- Western Hemisphere Corixidae 603 frons. These all seem to have been taken in "Latitude 65°." His description of Corixa striata is unrecognizable but under it he de- scribes Variety B : "There were seven specimens distinguished by a black annulet surrounding the terminal half of the first dilated joint of the tarsus in question" (posterior tarsus). This is undoubtedly CaUicorixa alaskensis Hungerford. Then he describes two speci- mens under the name Corixa carinata wliich he proposes as a new species, not knowing that a corixid was named C. carinata by Sahl- berg in 1819. Fieber in 1851 renames this as Corixa kirbyi. How- ever, Kirby then describes two other specimens "taken with the preceding" under the name Corixa planifrons which is four lines long (same as his C. carinata) and admits "they may perhaps be sexual varieties." Without doubt they are males of the two he named Corixa carinata. We have two males and three females from Great Slave Lake. The females would fit Corixa carinata Kirby and the males, Coi'ixa planifroiis Kirby. We therefore are convinced that since Corixa carinata was a preoccupied name, the species should be called Corixa planifrons Kirby and Corixa kirbyi Fieber 1851 becomes a synonym. Since the Kirby types are lost, we are selecting a male from Great Slave Lake as a neotype. Data on distribution: (Plate XC.) Canada: Newfoundland: Ferryland, Aug. 2, 1934, S. T. Brooks (Carnegie), 1 male, 3 females. Labrador: Grand Caribou Isld., Battle Harbor, July 16, 1927, A. C. Weed, 3 males, 4 females, Rawson-MacMillan Exp. (Chicago- Field Mu.«. Coll.). Northwest Territories: Great Slave Lake, Outpost Isl., Aug. 28, 1945, D. S. Rawson, 2 males, 2 females; same place and collector, Aug. 1, 1945, 1 female. Al.\ska: Fort Yukon, May 24, 1912, J. M. Jessup, 1 male, 1 fe- male; nr. Mt. Pavlof, Sept. 9, 1913 (F. C. Van Dyke, donor), 3 males, 1 female; Agattu Island, May 12, 1937, V. B.' Scheffer (L. W. Saylor Biol. Survey, Wash., D. C), 1 female; Unalaska, Aug. 26, 1937, V. B. Scheffer (L. W. Saylor Biol. Survey, Washington, D. C), 1 female; Nome, Aug. 21, 1913 (F. C. Van Dyke, donor), 1 male; Sanak Island, Aug. 28, 1937, V. B. Scheffer (L. W. Saylor Biol. Surv., Wash., D. C), 1 female; East Unalga Island, Aug. 28, 1937, V. B. Scheffer (L. W. Saylor Biol. Surv., Washington, D. C), 13 males, 38 females and 12 nymphs. ^04 The University Science Bulletin PLATE LXXXVIII Arctocorisa Wallengren Fig. 1. Arctocorisa carinata (Sahlberg) ; pala of male. Fig. la. Ventral view of 7th abdominal segment of female. Fig. lb. Genital capsule of male. Fig. Ic. Dorsal view of male abdomen. Fig. Id. Right clasper, enlarged. Fig. 2. Arctocorisa lawsoni n. sp.; pala of male. Fig. 2a. Ventral view of 7th abdominal segment of female. Fig. 2b. Genital capsule of male. Fig. 2c. Dorsal view of male abdomen. Fig. 2d. Right clasper of male, enlarged. Fig. 3. Arctocorisa germari (Fieber); pala of male. Fig. 3a. Genital capsule of male. Fig. 3b. Right clasper, enlarged. Fig. 3c. Dorsal view of male abdomen. Fig. 4. Arctocurim planijrons (Kirby) ; pala of male. Fig. 4a. Ventral \'iew of 7th abdominal segment of female Fig. 4b. Genital capsule of male. Fig. 4c. Dorsal view of male abdomen. Fig. 4d. Right clasper of male, enlarged. Western Hemisphere Corixiuae 605 PLATE LXXXVIII ■ / 2a ARCTOCORISA WALLEN.-^ •* 606 The University Science Billetin PLATE LXXXIX Arctocorisa Wallengren ^o' Fig. 1. Arctocorisa chancecB Hungerford; pala of male. Fig. la. Genital capsule of male. Fig. lb. Right clasper of male, enlarged. Fig. Ic. Ventral view of 7th abdominal .segment of female. Fig. Id. Dorsal view of male abdomen. Fig. 2. Arctocorisa sutilis (Uhler) ; showing variation; pala of male Fig. 2a. Genital capsule of male. Fig. 2b. Right clasper of cotype, enlarged. Fig. 2c. Right clasper, Pingree Park, Colo. Fig. 2d. Ventral view of 7th abdominal segment of female. Fig. 2e. Dorsal view of male abdomen. Fig. 3. Arctocorisa sutilis (Uhler) ; pala of male. Fig. 3a. Genital capsule of male (lectotype). Fig. 3b. Right clasper of male (like lectotype, Pingree Park, Colo.). Fig. 3c. Ventral view of 7th abdominal segment of female. Fig. 3d. Dorsal view of male abdomen. Fig. 4. Arctocorisa convexa (Fieber) ; pala of male. Fig. 4a. Genital capsule of male. Fig. 4b. Right clasper, enlarged. Fig. 4c. Ventral view of 7th abdominal segment of female. Fig. 4d. Dorsal view of male abdomen. Western Hemisphere Corixidae 607 PLATE LXXXIX #»!!?"°' 608 The University Science Billetin PLATE XC Western Hemisphere Corixidae 609 The Genus Sigara Fabricius 1775 1775. Fabricius, J. C. Syst. Ent., p. 691. 1804. Latreille, P. A. in Sonnini's Buffon, Ins. XII, p. 289. 1924. Schumacher, F. Deutsch. Ent. Zeitschr., pp. 337-339 (says Coriia Geoffr. is uyn- • onym). 1927. Jaczewski, T. Ann. Zool. Mus. Pol. Hist. Nat.. T. VI, zesz. 3, pp. 2.51-261 (as genus, sens. lat.). 1928. Jaczpwski, T. Ann. Mus. Zoo!. Pol. VII, pp. 45-67 (as genus, sens. Int.: wide distribution). 1928. Lundblad, O. Sartryck ur Ent. Tidskr., XLVIII, Haft 4, pp. 228-241 (r»s genus, sens. lat.). 1929. Hutchinson, G. E. Annals of the South African Mus., XXV, Pt. .S, p. 448 (de- scription; sens. lat.). 1929. Lundblad, O. Zoologischer Anzeiger, Bd. 80, Heft 7/9, pp. 193-204 (s<;^s. lot.). 1930. Hutchin.son, G. E. Proc. Zool. Soc. London, XXIX, Pt. 2, p. 461 (.sens. lat.). 1930. Jones, H. P. Ent. Record, XL-XLII; reprint, p. 72 (= Arctocorisa Wallengr., Oshanin Cat. ; = Corixa Br. Cat.). 1930. Walley, G. S. Bull. Brookl. Ent. Soc. XXV, ii. 49 (Corixa Geoffroy = Sigara Fabr.). 1935. De Carlo, Jose A. Revista Chilena de Hist. Nat., XXXIX, p. 108 (= Arctocorisa Wallengr.; = CaUicorixa B. White; and adds in footnote that it has for some time been con- fused with Corixa Geoffroy). 10;^5. Poisson, R. Archives de Zool. Exji. et Gen., LXXVII,, p. 457 (= Arctocorisa Wal- lengr.; = Calliforixa B. White); p. 504 (as subg. — Sigara sens. str.). 1936. Lindberg, Hakan. Die Tierwelt der Nord. und Ostsee, Lieferung 30, Tiel XI, pp. 114-115 (genus, setis. lat.). 1936. Poisson, R. Ext. du Bull, de la Soc. Sci. Bretagne, Tome XIII, Fasc. 1 and 2, p. G (subgenus Sigara s. s.). 1937. Wagner, Eduard. Verhandl. des ^'cr. f. naturw. Heimatforschung zu Hamburg. Bd. 25, pp. 61-62 (sens. lat.). 1938. China, W. E. Ent. Mo. Mag., LXXIV, pp. 34-37 (Sigara F. not a synonym of Corixa Geoffr.) (=: Arctocorisa Wallengr.). 1939. Macan, T. T. Freshwater Biol. Asso. British Empire, Sci. Publ. I, pp. 7-17 (key, sens. lat.). 1939. Pearce, E. J., and Walton, G. A. Trans. Soc. for British Entomology, VI, Pt. 7, pp. 160-161 (genus, sens. str.). 1940. Walton, G. A. Trans. Co^n. Acad. Arts and .«ci.. XXXIII, p. 345 (as subg. of Corixa Geoffr.). 1940. Hutchinson, G. E. Trans. Conn. Acad. Arts and Sci., XXXIII, pp. 341-343 (as subg. of Corixa Geoffr.). 1942. Walton, G. A. Trans. Roy. Ent. Soc. London, 92 (2), pp. 441-442 (subg. of Corixa Geoffr.). 1943. Walton, G. A. Trans. Soc. for British Ent., Vol. 8, Pt. 5, pp. 158-162, 103, 165, 167 (as subgenus of Corixa Geoffr.; also, p. 165, as synonym of Corixa Geoffr.). 1943. China, 'W. E. Ent. Mo. Mag., LXXIX, pp. 109-111 (not congeneric with Cori.Ta Geoffr.). 1943. China, W. E. The Generic Names of British Insects. Part 8, the Generic Names of the British Hemiptera-Heteroptera, pp. 28B, 305 (as subgenus of Corixa Geoffr.). The genus Sigara Fabricius is an extremely variable one, occur- ring all over the world, and is composed of a number of subgenera containing a great many species. Of these subgenera, Arctosigara new subg. [containing conocephala, penniensis, and decoratella (Hungerford) and bicoloripennis (Walley)] is probably the most primitive, in the sense of being the least variable, while those species belonging to the subgenus Tropocorixa Hutchinson show the 39—822 610 The University Science Bulletin greatest variation. In the Western Hemisphere, the subgenus Tropocorixa occurs in South America, while most of the North American sjiecies of Sigara fall into Vermicorixa Walton. There are no representatives in the Americas of Halicorixa Walton or of Retrocorixa Walton. Because of the extreme variation from one subgenus to another, it is difficult to characterize this genus. However, the various species have the following characters in common: Lateral lobes of the prothorax elongate, linguiform [except S. ornata (Abbott)]; anterior tibiae with a few small apical spines, those of males carinate dorsally, often with an apical pad; meta- xyphus rather small, usually triangular or arrow-shaped. Venter of hind femur pubescent on at least the basal third, often more, the glabrous portion with scattered spines; upper surface with from 2 or 3 spines to 2 or 3 longitudinal rows of spines. Genotype: Notonecta striata Linne. KEV TO SIGARA OF THE WESTERN HEMISPHERE 1. South American species with pattern of hemelytra mottled, broken into miiny fragments ; male right clasper of bizarre shapes . . . S. Tropocorixa Hutchinson (See key, p. 764) Xol as above 2 2. (1) Length of insects more than 6.3 mm. long 3 Length of insects less than 6.3 mm. long 10 3. (2) Palae of both sexes with only 14 to 16 lower palmar hairs. Sigara (Arctosit/ara) dccoratclla (Hungfd.) (p. 616) Palae of both sexes with from 18 to 22 lower palmar hairs 4 4. (3) Mesoepimeron at the level of the scent gland osteole broader than the lateral prothoracic lobe, with the osteole remote from the tip of the mesoepimeron. . 5 Mesoepimeron narrow ; osteole near tip 6 5. (4) Postnodal pruinose area nearly 2Vi times as long as the claval pruinose area; meron longer than the claval pruinose area ; anal lobes of female deeply in- cised ventrally along inner margin Sigara (Xcnosigara) ornata (Abbott) (p. 631) Postnodal pruinose area less than twice as long as the claval pruinose area ; meron equal in length to the claval pruinose area; female anal lobes normal. Sigara (Pediosigara) depressa n. Fp. (p. 640) 6. (4) Motaxyphui- broad, nearly quadiiitc; claw of pala serrate at base in both sexes. Sigara (Allosigara) decorata (Abbott) (p. 629) MetaxyphiiS normal ; palar claw normal 7 7. (6) Postnodal pruinose area longer than the pruinose area along the claval suture. 8 Postnodal pruinose area and claval pruinose area of equal length. Sigara (Vermicorixa) alternata (Say) (p. 653) 8. (7) Inlcroculat S|iace plainly nrirrowor than an eye; male pala with peg row near palm Sigara (Arctosii/ara) pevnien.fis (Hungfd.) (p. 620) Interocular space practically c(|ual to the width of an eye; male pala not as above ■' Western Hemisphere Corixidae 611 9. (8) Metaxyphus not appearing inflated, the tip not bent dorsad between the hind coxae; male pala long and slender; male vertex conically produced. Sigara (Arctosigara) conocephala (Hungfd.) (p. 614) Metaxyphus inflated, the tip bent dorsad between hind coxae; male pala a thin, broad plate ; male vertex onlv slightly produced. Sigara (Suhsigara) fallenoidea (Hungfd.) (p. 643) 10. (2) Pronotal disk with median longitudinal pale line 11 Pronotal di.sk without a median longitudinal pale line 18 11. (10) Species with the mesal margin of the mesoepimeron extending beyond the disto- lateral angle of the mesosternurfi for a distance equal to or greater than the distance between the tip of the mesoepimeron and the scent gland osteole. ... 12 Species with the mesal margin of the mesoepimeron extending beyond the disto- lateral angle of the mesostenium for a distance shorter than the distance be- tween the tip of the mesoepimeron and the scent gland osteole 14 12. (11) Hemelytra nearly black with obscure longitudinal pale markings; dorsal cd e of male pala thickened, with a prominen/t keel on the outside. Sigara ( Phaeosigara) variabilis (Hungfd.) (p. 7:^3) Hemelytra and male pala not as above 13 13. (12) Male pala with a single row of pegs; female abdomen w^ith anal lobes not notched on inner ventral margin Sigara (Vermicorixa) johnstoni n. sp. (p. 693) Male pala with two rows of pegs ; female abdomen with anal lobes notched on inner ventral margin Sigara {Vermicorixa) knighti n. Bp. (p. 695) 14. (11) The mesal margin of the mesoepimeron extending beyond the disto-lateral angle angle of the mesosternum for a distance equal to only one-third the distance between the tip of the mesoepimeron and the scent gland osteole. Sigara (Pediosigara) depressa n. sp. (p. 640) The mesal margin of the mesoepimeron extending beyond the disto-lateral angle of the mesosternum for a distance equal to at least one-half the distance between tip of mesoepimeron and the scent gland osteole 15 15. (14) Pronotum and hemelytra (including membrane) boldly cross -barred*; vertex in both sexes conically produced beyond eye-curve. Sigara (Vermicorixa) transfigitrata (Walley) (p. 689) Pattern less striking : vertex not noticeably produced 16 16. (15) Moderately rastrate ; pale figures on distal half of clavus and on corium ar- ranged longitudinally in more or less connected series ; pattern of membrane distinct 17 Strongly rastrate ; pale figures on distal half of clavus and usually those on corium transverse ; pattern of membrane indistinct or effaced ; male strigil small and round Sigara (Phaeosigara) compressoidea (Hungfd.) (p. 735) 17. (16) Male with elongate strigil ; right clasper of male genital capsule strongly con- stricted Sigara (Phaeosigara) mackinacensis (Hungfd.) (p. 740) Male with rounded strigil; right clasper of male genital capsule not con- stricted Sigara (Phaeosigara) mississippiensis (Hungfd.) (p. 742) 18. (10) Corial pattern in definite longitudinal series or solid black 19 Corial pattern not in definite longitudinal series 23 19. (18) Claval and corial fields solid black; pronotum black, crossed by three or four pale lines Sigara (Pediosigara) hydatotrephes (Kirk.) (p. 638) Not as above 20 * Transfigurata is typically with four black bands on the pronotal disk, and hemelytra cross-banded, but .sometimes the pronotum, clavus, corium. and membrane are solid black, ex- cept for the pale median line on the pronotum. 612 The University Science Bulletin 20. (19) Clavus> with pale lines in wavy longitudinal seiif^: hypo-ocular suture ending laterad of the middle line of the eyes. Sigarn (Pikosit/ara) dotiglasensis (Hungfd.) (p. 634) Not as above 21 21. (20) Antennae usually 3-segniented ; small .species, less than i.'l.'> mm. long. Sigara {Lasiosi^ara) lineata (Forster) (p. 645) Antennae 4-segmented; larger species, more than 4.2,") mm. long 22 22. (21) Scent gland osteole far laterad, remote from tip of mesoepimeron ; male pala with a single row of pegs Sigara (Lasiosigara) trilineata (Prov.) (p. 649) Scent gland osteole near end of mesoepimeron ; male pala with two rows of pegs Sigara (Vermicorixa) mitllettensis (Hungfd.) (p. 691) 23. (18) Metaxyphus longer than broad 24 Metaxyphus not longer than broad 28 24. (23) Mesoepimeron at level of the scent gland osteole about equal in width to the lateral lobe of the prothorax 25 Mesoepimeron at level of the scent gland osteole much broader than the width of the lateral lobe of the prothorax 27 25; (24) Pronotum longer than the head as seen from above 26 Pronotum shorter than the head as seen from above; crossed by only 3 or 4 pale lines Sigara (Phaeosigara) macrocepsoidea Hungfd (p. 751) 26. (25) Male with stridular area on front femur ; female pala depressed dorsally neai apex Sigara (Phaeosigara) dolahra H. & S. (p. 752) Male without a stridular aiea on front femur; female pala not depressed. Sigara {Aphelo sigara) jarmanae Hungfd. (p. 636) 27. (24) Pale bands on base of clavus entire, bands on cerium plainly transverse; female pala normal ; dorsal surface of hind femur with only 3 or 4 pegs. Sigara {Vertnicorixa) solensis (Hungfd.) (p. 686) Pale bands on base of clavus more or less broken and confused, sometimes in faintly longitudinal series ; female pala depressed dorsally near apex ; dorsal surface of hind femur with two or three rows of pegs. Sigara (Phaeosigara) signata (Fieber) (rr seriata Abbott) (p. 745) 28. (23) With the scent gland osteole nearer the lateral bend of the mesoepimeron than to its tip 29 With the scent gland osteole nearer to tip than to lateral bend of the meso- epimeron 32 29. (2S) Male peg row of about 22 pegs midway between dorsal margin and palm; fe- male pala slightly depressed dorsally. .S/.f/nrn (Virnucorixa) gordita (Abbott) (p. 712) Male peg row of 3(1 or more pegs, nearer to tloisal margin; female pala not depressed 30 30. (29) Head with median longitudinal brown line ; pruinose area long claval suture much shorter than the postnodal pruinose area ; mesoepimeron with a deep incision at or near the lateral bend; male strigil large. Sigara (V) nnicnrixa) mathe»irii n. np. -■:..- (p. 683) Not as above 31 31. (30) Osteole almost in lateral bend of mesoepimeron, and connected to the metaster- num by the broad, often dark postcoxal piece (lateral flange of the sternel- lum) Sigara (Vermicorixa) grossolineata n. ep. (p. 676) Osteole not so far hileiad Sigara (Vermicorixa) stigmatica (Fieb.) (p. 665) Sigara {Vermicorixa) modesta (Abbott) (p. 666) Western Hemisphere Corixidae 613 32. (28> Claval lineations more or less entire or slightly forked • • 33 Not as above, broken into many fragments -15 33. (32) Corial pattern in more or less definite longitudinal series 34 Corial pattern not as aVjove 35 34. (33) Pronotal disk laterally reduced; only 4 to 6 pegs on dorsal surface of hind femur Sigara (Vermicorixa) hubbelli (Hungfd.) (p. 696) Pronotal disk not laterally reduced : a row of at least a dozen pegs on dorsal surface of hind femur Sipara (Verinicorixa) dejecta n. sp. (p. 699) 35. (33) Metaxyphus short, plainly broader than long 36 Metaxyphus about as broad as long 44 36. (35) Metaxyphus tip a right angle Sigara (Arctl. Corisa limitata Fieber, F. X. Species Generis Corisa, p. 35 (2 specinriens in Halle from Pennsylvania). 1914. Conxa alteniata, Parshley. H. M. Psyche, XXI, No. 3, v. 140. (Part of series from Orono, Me., arc decoratella.) Western Hemisphere Corixidae 617 Size: Length 7.1 mm. to 8.1 mm. Width across eyes 2.1 mm. to 2.6 mm. Color: General facies medium to dark brown. Pronotum crossed by 7 to 9 dark bands ; posterior 3 or -4 tending to coalesce laterally with a brown marginal line. Clavus and corium cross-banded, the pale figures, especially on corium, slender, wavy, transverse lines. Corium separated by pale line from membrane which has reticulate pattern. Embolium usually pale, sometimes smoky; head pale, limbs pale except distal fourth of middle tarsus and second tarsal segment of hind leg typically embrowned; thorax around legs black, basal segments of abdomen black, margins pale. Anal lobes of fe- male typically brown or black. Structural characteristics: Head about half as long as pronotal disk; interccular space equal to or greater than the width of an eye; vertex slightly produced in both sexes; face rather hairy; male fovea oval, broad, but shallow; female face slightly flattened; an- tennal segmentation as follows: 1 : 2 : 3 : 4 : : 20 : 22 : 50 : 28 ^ ; 1 : 2 : 3 : 4 : : 20 : 25 : 50 : 30 5 . Pronotal disk rounded later- ally, somewhat pointed distally, with faint median carina on an- terior fourth; pronotum and hemelytra heavily rastrate, the latter with scattered hairs; pruinose area of embolar groove pos- terior to nodal furrow equal in length to that of claval su- ture. Lateral lobe of prothorax elongate, sides parallel, posterior distal angle slightly produced; mesoepimeron moderately broad but with osteole nearer to tip than to lateral bend; metaxyphus arrow- shaped, usually as broad as long. The front leg of female of usual shape but pala elongate, more than three times as long as broad. Front leg of male: pala elongate, nearly four times as long as broad, with about 38 pegs in a single row, a median longitudinal ridge on the outside of pala ; tibia half as long as pala with pronounced dor- sal carina and a large oval pad; femur slender, margins parallel, with pilose area on inner surface and a row of bristles extending from distal edge of pilose area to distal end of femur; trochanter with a hairj' tumescence. Middle and hind legs slender, hind femur with several stout spines distally on front margin. Proportional lengths of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 42.2 : 28.9 : 28.9. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 93.7 : 123.3 : 41.8. IVIale asymmetiy dextral; strigil small, elongate, of seven irregular combs. For details of male pala, abdomen, and geni- talia see Plate XCI, figs. 2, 2a, and 2b. Female abdomen normal. 618 The University Science Bulletin Comparative notes: This is closely related to S. conocephala but does not have the produced vertex of the male and the white line between corium and membrane is not so marked. Moreover, the dark figures of corium are transverse figures instead of tending to fuse into longitudinal series as they often do in S. conocephala. Location of types: Described from 12 specimens taken in Mack- inac Island by the writer August 19, 1925. Holotype, allotype and paratypes in the Francis Huntington Snow Collections, Univer- sity of Kansas. Data on distribution (Plate XCII) : Canada: New Brunswick: Lower Camp, June, 1943, N. Allison, 2 males. Quebec: Montreal Island, April 26, 1903 (Bueno Coll.) 1 male. Ontario: Minaki, June 30— July 4, 1928, J. McDunnough (re- corded by Walley) ; Ottawa, July 18, 1913, J. I. Beaulne. Manitoba: MacDonald, Aug. 9, 1937, H. T. Peters, 9 males, 22 females; Cowan, Aug. 7, 1937, C. L. Johnston, 1 male, 3 females; Hartney, July 31, 1937, Beamer and Peters, 6 males, 1 female; Mafeking, Aug. 3, 1937, C. L. Johnston, 5 males, 4 females; Red Deer R., Aug. 3, 1937, same collector, 1 male; Deepdale, Aug. 1, 1937, same collector, 1 male, 1 female; Birch R., Aug. 3, 1937, same collector, 1 male; Aweme, April 7, 1931, R. M. White (Walley re- cord) ; same place, at light, Aug. 23, 1905, J. Fletcher (Walley re- cord) ; Winnipeg, 1900, A. W. Hannam (Walley record) ; Cross Lake, June 3, 1921, C. G. H. (Wallis), 1 female. Saskatcheivan: Kinderline's Lake, Aug. 29, 1938, D. S. Rawson, 1 male; Redberry Lake, Aug. 26, 1938, same collector, 1 female; Long Lake, June 14, 1938, same collector, 1 male; Murray Lake, 1940, same collector, 1 male, 1 female; Pelly, Aug. 2, 1937, C. L. Johnston. 2 males, 1 female; same place and date, R. H. Beamor, 2 males, 1 female. Alberta: Edmonton, Owen Bryant (Bryant Coll.), 2 males, 2 fe- males; Tofidd, same collector and collection, 1 male; Bilby, same collector and collection, 1 male; Edmonton, Aug. 7, 1915, E. H. Strickland (Walley record) ; Lethbridge, July 23, 1915. British Columbia: Shafer Lake, Aug. 7, 1944, J. A. Munro, 1 male. 1 female, nymph; Nicola Lake, June 17, 1922, E. R. Buckell (Walley record). A^. W. T.: Athabaska R., about 2 mi. above Pelican R., nr. Ft. Western Hemisphere Corixidae 619 McMurray, F. Harper (Walley record) ; (Canada Coll.) male (clasper ex.). Alaska: Ft. Yukon. May 24, 1912, J. M. Jessup, 1 female; Dall R., J. T. White (Abbott Coll.), 1 male. U. S. A.: Maine: Fryeburg, Aug. 20, 1934, M. E. Griffith, 2 males, 1 female; Pennamaghane R., June 10, 1893, W. C. Kendall, 4 males, 5 females; Orono, April 20, 1912, H. M. Parshley (Parsh- ley Coll.), 1 male. 2 females; same place, July 20, 1905, Me. Exp. Sta., 1 female; Paris, July 10, 1915, C. A. Frost, 1 male; Sebago L., Aug. 10, 1921, Hall (Wheeler Coll.); Lincoln, Sept. 3, 1934, H. G. Walker (U. S. N. M.). det. Feb., 1941. Massachusetts: Forest Hills, May 3, 1922, R. F. Hussey (Hussey Coll.), 1 female; same place, Nov. 1, 1915, H. M. Parshley (Parsh- ley Coll.), 1 male, 1 female; Saugus, June 21, 1914, F. W. Dodd, 1 male; Amherst, May 7, 1904, 3 females; Danvers,*July 3, 1914 (Parshley Coll.), 1 male. 2 females. Connecticut: New Haven, June 30, 1910, A. B. Champlain, 1 male, 2 females; Windham Co., Aug. 11. 1927, C. L. Hubbs (Mich. Coll.), 1 male; New Haven, June, 1910, A. B. Champlain, 1 male, 4 females; Hamden, April 24, 1911, B. H. Walden, 1 male. Rhode Island: Kingston, Nov. 11, 1909, 9 males, 28 females. Black Island, July 25, 1910 (Parshley Coll.), 1 female. Neiv York: (Uhler Coll.), 1 female; Lava, Sullivan Co., June (Bueno). 1 male, 1 female; Long Island, Cold Springs Harbor, July n, 1919, H. M. Parshley (Parshley Coll.), 1 male; White Plains, Jan. 20, 1909 (Bueno), 1 male, 1 female. Neiv Jersey: Lakehurst, June 16, 1917, L. B. Woodruff, 3 fe- males; same place, March 30 (Bueno) ; Pitman, July 3, 1942, J. C. Bradley, 5 males, 2 females. Pennsylvania: Shawville, April 23, 1941, John Bauer (Carn.) 5 males, 4 females; Erie, Presque Isle, Aug. 1940, G. E. Wallace (Carn.j, 1 male. Michigan: Mackinac Island, Aug. 19, 1925, H. B. Hungerford, 4 males, 6 females; Douglas Lake, Aug. 6, 1927, same collector, 4 females; same place and collector, July 18, 1923, 1 female; same place and collector, Aug. 15, 1923, 3 males; Burt Lake, July 29, 1930, same collector, 10 males, 12 females; Nigger Creek Mullett, Aug. 4, 1925, same collector, 1 male; Pellston, 1930, same collector, 4 males, 8 females; Cheboygan Co., July 11, 1938, same collector, 1 male, 1 female; same place, Aug. 14, 1918, R. F. Hussey (Hussey 620 The University Science Bulletin Coll.). 1 female; Druid's Hill (Uhler Coll.), 1 male; Taquamenon R., Luce Co., May 20, 1925, J. Metzelaar (Mich.), 1 male, 10 females. Iowa: June-July, 1940 (Iowa Wesleyan), 8 females. Wisconsin: Dane Co., March 16, 1930, E. P. Breakey, 1 male, 4 females; St. Croix R., Aug. 17, 1928, Schultz and Tarzwell (Mich.), 8 males, 11 females. Minnesota: Olivia, June 28, 1921, H. H. Knight. 1 male; St. Paul, June 20, 1921, H. B. Hungerford, 1 male, 26 females; same place and collector, July 11-14, 1921, 7 males, 13 females; same place and collector, July 31, 1921, 5 females; Bengal, Aug. 13, 1922, same collector, 1 male; Grand Marais, Aug. 13, 1922, same collector, 1 female; St. Louis Co., July, 1934, same collector, 5 males, 2 fe- males; Minnehaha Cr., July 9, 1921, same collector, 10 males, 18 females; Cooley, Aug. 13, 1932, C. L. Johnston, 1 male; St. Paul, July 16, 1932, A. A. Granovsky, 1 male (Minn. Coll.) ; same place and collector, May, June, 1934, 14 males, 11 females; same place and collector, June 30, 1933, 1 male, 3 females; same place and collector, July 27, 1933, 1 male, 2 females; same place and collec- tor, July, 1934, 22 males, 17 females; Faribault, June 14, 1934, same collector, 2 males, 2 females; Olivia, June 28, 1921, H. H. Knight (Minn.), 9 males, 15 females; St. Paul, July 11, 1921, H. B. Hungerford (Minn.), 4 males; same place, June 27, 1921, W. E. Hoffman (Minn.), 12 males, 50 females. North Dakota: Ft. Totten Lake, Aug. 7, 1919, C. Thompson, 2 males, 2 females; Lake Metagoshe, July 30, 1937, Beamer, Johns- ton and Peters, 2 males, 2 females; Turtle Mts., Aug. 3, 1920, R. F. Hussey (Hussey Coll.), 1 male. South Dakota: Weta, July 18, 1937, R. H. Beamer, 1 male; same place and date, H. T. Peters, 2 males; same place and date, C. L. Johnston, 2 males, 1 female. New Mexico: Tajique, July 25, 1941, Burt Hodgden, 1 male, 1 female. Sigam iArctosigara) penniensis (Hungerford) (Plate XCI, figs. 3, 3a-3b) 1928. ArctucDrixa penniensis Hungerford, H. B. Can. Ent., Vol. LX, p. 228, figs. 7 ;nul 8. 1932. Arctocorixa penniensis, Walley, G. S. Can. Ent., Vol. LXIV, No. 7, p. 153. Size: Length 7.1 mm. to 7.6 mm. Width across eyes 2.1 mm. to 2.3 mm. Color: General facies dark. Pronotum crossed bv 7 to 8 dark Western Hemisphere Corixidae 621 bands. Pale color transverse on base of clavus, narrower than brown and interrupted. Pale markings of corium short, transver,^e, wavy lines arranged in 2 to 3 longitudinal series. Pale line separates corium from membrane which is fairly evenly covered with pale markings. Embolium, head, limbs, and sides of thorax pale. Basal abdominal segments of male smoky. Stnictural characteristics : Head* about two-thirds as long as pro- notal disk; postocular space greatest at inner angles of eyes, rear margins of eyes nearly straight; interocular space less than the width of an eye; vertex rounded but projecting beyond eye margins in both sexes as seen from above; face not hairy; male fovea oval, moderately depressed, not attaining eyes laterally; antennal seg- mentation as follows: 1 : 2 : 3 : 4 : : 25 : 15 : 43 : 30 j ; 1 : 2 : 3 : 4 : : 25 : 20 : 45 : 30 5 . Pronotal disk pointed laterally, median carina on anterior fourth, apex rather pointed ; pronotum and hemel- ytra moderately rastrate, the latter with scattered pale hairs; prui- nose area posterior to nodal furrow a little longer than that of claval suture. Lateral lobe of prothorax elongate, base slightly constricted, apex rounded; thoracic region not inflated laterally as seen from above, mesoepimeron narrow, with osteole near tip; metaxyphus small, triangular, broader than long. Front leg of female of usual shape. Front leg of male: pala elongate, faintly carinate on out- side, 30 to 31 pegs in a single unbroken row lying close to the upper palmar row of bristles; tibia half as long as pala, with a short dorsal carina and a medium-sized, oval pad; femur relatively slender, sides parallel almost to distal margin, then ventral margin curving sharply upward, pilose area on inner surface near base; the tro- chanter with a hairy tumescence. Middle and hind legs slender; proportion of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 42.2 : 34.2 : 39.2. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 91 : 122.1 : 44.4. Male asymmetry dex- tral; strigil small, oval, of 4 regular combs. For details of male structures see Plate XCI, figs. 3, 3a, and 3b. Female abdomen with eighth ventral segment sinuous across tip. Anal lobes not incised on inner ventral margin. Comparative notes: In this species the mesoepimeron is slightly narrower than the lateral lobe of the prothorax; it may be dis- tinguished from Subsigara fallenoidea (Hungfd.), which also has this character, in not having the pale figures of the corium arranged in a transverse series. 622 Tin: University Science Bulletin Location of types: Described from 21 specimens taken by mc in Penny Lake, Mich., Aug. 8, 1924. Holotype male, allotype female, 8 male and 11 female paratypes in the Francis Huntington Snow Collections, University of Kansas. Data on distribution: (Plate XCII.) Canada: Newfoundland: 1939, G. A. Walton, 1 female. New Brunswick: Lower Cam'p, June, 1943, N. Allison, 1 male, 1 female. Manitoba: Cowan, Aug. 7, 1937, C. L. Johnston, 14 males, 11 females; same place and date, H. T. Peters, 7 males, 6 females; same place and date, R. H. Beamer, 3 females. Saskatchewan: Pelly, Aug. 2, 1937, C. L. Johnston, 1 female; Sask. R. (Uhler Coll.), 1 male. A^. W. T.: Good Hope, Sept. 20, 1929, Owen Bryant (Bryant Coll.), 1 female. British Columbia: Prince Rupert, Jan. 23, 1944, Norman Carter, 19 males, 11 females. U.S.A.: New York: Old Forge, June 20, 1905 (Bueno Coll.), 1 male. Rhode Island: Providence (Davis Coll.), 1 female. New Jersey: Lahaway (Hussey), 2 females. Michigan: Chippewa Co., Henry R., May 26, 1925, J. Metzelaar (Mich.), 1 male; Douglas Lake, July-Aug.. 1923, H. B. Hungerford, 1 male, 1 female; Penny Lake, Aug. 8, 1924, same collector, 8 males, 10 females; Douglas Lake, summer, 1924, same collector, 2 males, 12 females; Mackinac Island, Aug. 19, 1923, same collector, 1 male; Pellston, road pool, 1930, same collector, 10 males, 39 females; Cheboygan Co., Aug. 16, 1918, R. F. Hussey (Hussey Coll.), 1 male, 4 females. Minnesota: St. Louis Co., Aug. 14, 1922, H. B. Hungerford, 3 males, 44 females; Bengal, Aug. 18, 1922, same collector, 1 male, 4 females; Itasca Park, Aug. 21, 1922, same collector, 9 males, 14 females; Carlson. Aug. 8, 1922, same collector, 1 female; Beaver Dam, Aug. 12, 1922, same collector, 1 male, 3 females; Eveleth, Aug. 13, 1937, C. L. Johnston, 2 females; Minneapolis, Sejit. 11, 1919, R. F. Hussey (Hussey Coll.), 1 female. South Dakota: Weta, July 18, 1937, C. L. Johnst(m, 18 males, 13 females; same place and date, H. T. Peters, 7 males, 5 females; same place and date, R. H. Beamer, 3 males, 4 females. Western Hemisphere Corixidae 623 Sigara [Arctosigara) bicoloripennis '(Walley) (Text fig. 7 ; wash drawing No. 42 on Plate VII) 1936. Arctocorixa bicoloripennis Walley, G. S. Can. Ent. LXVIII, p. 55, PI. 2, figs. 5, 10. (Walley says close to A. penniensis Himgerford.) Size: Length 5.7 mm. to 6 mm. Width across eyes 1.8 mm. to 2 mm. Color: General facies light to medium brown. Pronotum crossed by 7 to 8 dark bands about as wide as pale interspaces, distal ones tending to coalesce laterally. Clavus cross-banded, the bands of middle portion coalescent along inner margin. Corial pattern more wavy and irregular, but still arranged in transverse series. Corium separated by a pale line from the membrane which has a reticulate pattern. Embolium, head, and limbs pale. Venter smoky with pale margins ; distal portion of abdomen also pale. Structural characteristics: Head about one-half as long as pro- notal disk; interocular space less than the width of an eye; vertex smoothly rounded as seen from above; facial hairs few; male fovea oval, fairly shallow, and narrow, not attaining eyes laterally; an- tennal segmentation : 1 : 2 : 3 : 4 : : 20 : 15 : 38 : 25 ^^ ; 1 : 2 : 3 : 4 : : 20 : 15 : 38 : 25 $ . Pronotal disk rounded laterally and dis- tally, with median carina on anterior third; pronotum and heme- lytra heavily rastrate, the latter with occasional pale hairs ; pruinose area of the embolar groove posterior to nodal furrow equal in length to that of the claval suture. Lateral lobe of prothorax elongate, its posterior distal angle slightly produced ; mesoepimeron relatively broad (broader than lobe of prothorax), with osteole near tip; metaxyphus considerably broader than long with margins a right angle at tip. Front leg of female of usual shape. Front leg of male: pala slender, dorsal margin tapering to claw, peg row closer to palm than to dorsal margin and containing about 25 teeth ; tibia about two-thirds as long as pala, with dorsal carina and an oval pad; femur relatively slender, ventral margin expanded at about the middle, pilose area on inner surface followed by a row of stouter hairs; trochanter with a tumescence. Middle and hind legs slender; proportions: Middle leg: femur : tibia : tarsus : claw :: 100 : 44.7 : 31 : 44.7. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 77.8 : 108.4 : 41.7. Male asymmetry dextral; strigil minute, transverse, of 3 combs. For details of male structure see text fig. 7. Female abdomen normal. Comparative notes: Mr. Walley says this species is near A. pen- 624 The University Science Bulletin mensfs- Hunger ford. Its smaller size readily separates it from that species. Location of types: Holotype male, No. 4046, allotype female, and 4 female paratypes from Minaki, Ontario, July 4, 1928, J. McDun- nough; 1 male paratype, Brent's Lake, Summerland, B. C, Oct. 29, 1931, A. N. Gartrell. The above in the Canadian National Museum, Ottawa, Out.; 1 male paratype from Glen Souris, Man.. Sept. 21, 1922, N. Griddle, and 1 female paratype from Minaki, Ont., July 4, 1928, J. McDunnough in the Francis Huntington Snow Entomolog- ical Collections, University of Kansas. The female paratype is not »S. bicoloripennis Walley but is my new species, S. dejecta. The type series should be examined critically. Data on distribution: (Plate XCII.) Canada: Ontario: The type series above. , Manitoba: Glen Souris, Sept. 21, 1922, N. Criddic, 1 male; Swan River, June 5, 1936, H. E. McClure, 1 male; same place, Aug. 2, 1937, C. L. Johnston, 1 male; Mafeking, Aug. 3, 1937, H. T. Peters, 24 males, 15 females; same place and date, C. L. Johnston, 7 males, 11 females; Hartney, July 31, 1937, H. T. Peters, 8 males, 9 fe- males; same place and date, R. H. Beamer, 8 males, 5 females; Russell, Aug. 1, 1937, C. L. Johnston, 5 males, 4 females; same place and date, H. T. Peters, 1 female; MacDonald, Aug. 9, 1937, H. T. Peters, 16 males, 21 females; Cowan, Aug. 7, 1937, H. T. Peters, 2 females; Minnedosa, June 4, 1933, H. E. McClure, 1 fe- male. Saskatcheivan: Prince Albert National Park, June 24. 1940, J. C. Stevenson, 2 males; same place and collector, Sept. 13, 1940, 1 male, 1 female; same place and collector, Aug. 17, 1940, 1 female; Pelly, Aug. 2, 1937, C. L. Johnston, 1 male. U. S. A.: Michigan: Lake Gogebic, Aug. 18, 1937. R. H. Beamer, 1 male; Douglas Lake, Aug. 4, 1932, H. B. Hungcrford, 1 female; Ann Arbor, April 17, 1921, R. F. Hussey (Hussey Coll.), 1 male; Washtenaw Co., Pittsfield, April 8, 1918, R. F. Hussey (Hussey Coll.), 1 male. Wisconsin: Dane Co., March 16, 1930, E. P. Breakey, 1 male, 1 female; (C. F. Baker in U. S. N. M.), 2 males, 11 femafes. Minnesota: Olivia, June 28, 1921, H. H. Knight, 1 male; Cooley, Aug. 13, ]937, C. L. Johnston, 7 males, 6 females; Stephen, Aug. 10, 1937, Beamer and Johnston, 1 male, 1 female; Pelican Rapids, Aug. 22, 1922, H. B. Hungerford, 1 male, 1 female; Detroit, July 18, 1922, C. E. Mickel, 1 male, 1 female; Faribault. April 11. 1934. A. Western Hemisphere CoRixinAE 625 A. Granovsky, 1 male; Hibbing, August 16. 1922. H. B. Hunger- ford, 2 males, 2 females; Bengal, Aug. 16. 1922. same collector, 2 males, 7 females; Itasca Park, Aug. 21. 1922, same collector, 2 males, 2 females; (Uhler Coll.), 1 male, 1 female; St. Paul, July 16, 1922, A. A. Granovsky, 13 males, 5 females; same place and collector, June 29, 1931, 8 males, 4 females; same place and collec- tor. July 4-26, 1933. 4 males, 2 females; same place and collector, June 1-25, 1934, 6 males; same place and collector, July, 1934, 9 males, 1 female; same place, June 19, 1921, H. B. Hungerford, 2 males, 3 females; same place and collector, July 14. 1921, 2 males, 1 female; same place and collector, June 20. 1921. 4 males, 3 fe- males; same place and collector, July 28, 1921. 3 males, 7 females; same place, Oct. 3, 1919, R. F. Hussey (Hussey Coll.), 4 males, 3 females; Hennepin Co., Oct. 9, 1921, W. E. Hoffmann, 1 male; ]\Iinnehaha Cr., Aug. 9, 1921, H. B. Hungerford, 2 males; Benson, Aug. 23, 1922, same collector, 1 female; Olivia. June 28. 1921. H. H. Knight (Minn.), 5 males, 10 females; St. Paul. .June 25. 1921, W. E. Hoffmann (Minn.), 1 female; Minnetonka L.. July 15, 1921. H. H. Knight (Minn.), 1 male; St. Anthony Pk.. .Tune 30. 1921, same collector and collection, 1 female. North Dakota: Turtle Mts., Lake Upsilon. Aug. 3. 1920. T. H. Hubbell. 4 females; Nelson Co.. Aug. 25, 1922, T. L. Hankinson (Mich. Coll.), 1 male. South Dakota: Weta, July 18, 1937, R. H. Beamer. 3 males; Brookings. July 23, 1919, H. C. Severin, 1 male. bicolonpennis (Wol/ey) Fig. 7. Sigara {Arctoaigara) bi color ipennis (Walley) ; (a) geuital cap.sule of male; (b) front leg of male; (c) dorsal view of male aUdomen. 40—822 626 The University Science Bulletin PLATE XCI Sigara Arctosigara subgenus new Fig. 1. Sigara (Arctosigara) conocephala (Hungerford) ; dorsal view of male abdomen. Fig. la. Front leg of male. Fig. lb. Male genital capsule. Fig. 2. Sigara (Arctosigara) dccoratella (Hungerford); dorsal view of male abdomen. Fig. 2a. Front leg of male. Fig. 2b. Male genital capsule. Fig. 3. Sigara (Arctosigara) pennicnsis (Hungerford) ; dorsal view of male abdomen. Fig. 3a. Front leg of male. Fk;. 3b. Male genital capsule. Western Hemisphere Corixidae 627 PLATE XCI t conocepbcta {Hungfd) 2 decoroteiio [Hungfd) 628 The University Science Bulletin PLATE XCII Western Hemisphere Corixidae 629 Subgenus Allosigara new Corixids having a broad, almost quadrate metaxyphus and palar claws that are strongly serrated on basal half. Subgenotype S. decorata (Abbott). Sigara (Allosigara) decorata (Abbott) (Text fig. 8; wash drawing 47, Plate VII) 1916. Arctocorisa decorata Abbott, J. F. Ent. News, Vol. XXVII. p- '■'•^'^ (desc. from Mass.). 1917. Arctocorixa decorata. Van Duzee, E. P. Catalogue of Hemipteia . . . , p. 479. 1917. Arctocorisa decorata, Parshley, H. M. Occasional Papers of the Boston Soc. of Nat. Hist., VII, p.- 117. 192fi. Arrtiicorixa- decorata, Blatchley, W. S. Heteroptera of Eastern North America, p. 1071. 1926. ArctocorL-ca decorata. Hungerford, H. B. Bull. Brooklyn Ent. Soc, Vol. XXI, p. 19(i. Size: Length 8.2 mm. to 9.2 mm. AVidth across eyes 2.4 mm. to 2.8 mm. Color: General facies rather dark. Pronotum crossed by 8 to 9 bro^\^l bands, posterior ones tending to coalesce laterally. Clavus cross-banded, dark bands rather broad and somewhat forked. Corium also cross-banded but with dark bands tending to coalesce into indefinite longitudinal lineations along inner and outer margins. Membrane separated from corium by a pale line, its pattern some- what reticulate. Embolium, head, limbs and thorax pale; base of abdomen smoky, distal portion pale. Structural characteristics: Head more than half as long as the pronotal disk; postocular space broader at inner angle of the eyes than in many corixids; interocular space slightly narrower than the width of an eye; vertex rounded out beyond eye margins in both sexes as seen from above; face slightly hairy; male fovea oval, narrow, and rather shallow; antennae: 1 : 2 : 3' : 4 : : 28 : 20 : 50 : 35 (^ ; 1 : 2 : 3 : 4 : : 30 : 23 : 53 : 38 $ . Pronotal disk short, pointed laterally and rather pointed distally; median carina visible on anterior third; pronotum and hemelytra heavily rastrate;prui- nose area of embolar groo-\'e posterior to the nodal furrow longer than that of claval suture. Lateral lobe of prothorax elongate, its posterior distal angle produced, mesoepimeron narrow with osteole near tip; metaxyphus broad, almost cinadrate, distal margin usually notched medianly. Front leg: claw of pala serrate at base in both sexes and femur concave on lower surface distally. Front leg of male: pala with dorsal margin curving from base to claw, with a diagonal ridge across palar face, and witli 35 to 36 pegs in a row 630 The University Science Bulletin almost overlapping upper palmar row of bristles; tibia about half as long as pala and narrower, short dorsal carina, and an oval pad; femur relatively slender, with pilose area on inner surface. Middle and hind legs slender; hind femur and tibia each with row of short spines on dorsal surface; proportions of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 42 : 31.5 : 42. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 87.5 : 119 : 42.2. Male asymmetry dextral; strigil relatively small, of 6 fairly regular combs. For details of male structure see text fig. 8. Fe- male abdomen normal. Comparative notes: The very broad, short, nearly quadrate metaxyphus and the strongly serrated base of the palar claw in both sexes will separate this species from all others. Location of types: Holotype male, allotype female, labeled "Am- herst, Mass., Aug. 26, 1904 (Coll. H. M. Parshley)," given by Dr. H. M. Parshley to the Francis Huntington Snow Entomological Collections, University of Kansas, LawTence, Kansas. Data on distribution: (Plate XCIX.) Maine: Lincoln, Sept. 3, 1934, H. G. Walker, 1 female. Fig. 8. Sigara (Allosigara) decorata (Abbott); (a) pala of female; (b) genital capsule of male; (c) left clasper; (d) pala of male; (e) dorsal view of male abdomen; (f) metaxyphus. Western Hemisphere Corixidae 631 Massachusetts: N. Saugus, April 25, 1907, D. H. Clemons, 1 fe- male; Amherst, Aug. 26, 1904 (Parshley) (type series). Connecticut: Windham, Aug. 11, 1927, C. L. Hubbs (Mich.), 1 male. Minnesota: Hennepin Co., Oct. 20, 1921. W. E. Hoffmann (Minn.), 1 male; Olivia, June 28, 1921, H. H. Knight (Minn.), 4 males, 3 females; St. Anthony Park, July 10, 1921, H. H. Knight (Minn.), 1 male; St. Paul, June 25, 1921, W. E. Hoffmann (Minn.), 2 females; Hibbing, Aug. 18, 1922, H. B. Hungerford, 8 males. 10 females; Carlson, Aug. 8, 1922, H. B. Hungerford, 1 female; St. Paul, golf pond, July 31, 1921, H. B. Hungerford, 1 male, 3 females; St. Paul, June-July, 1934, at light, A. A. Granovsky. 12 males, 6 females. Illinois: Havana, Jan. 24, 1896, Hempel (111. Nat. Hist. Coll.). North Dakota: Fargo, July 26, 1937, C. L. Johnston. Subgenus Xenosigara new Differs from subgenus Sigara Sigara in having the pruinose area of the claval suture short and in having a laterally inflated thorax. The left clasper of the male is armed with many pegs and the anal lobes of the female are deeply incised. Subgenotype tS. ornata (Abbott) . Sigara (Xenosigara) ornata (Abbott) (Text fig. 9; wash drawine No. 48, Plate VII) 1916. Arctocorisa ornata Abbott, J. F. Ent. News, XXVH, p. 341 (desc. from \. V., Maine, Mass., and Conn.). 1917. Arctocoriia ornata. Van Duzee, E. P. Ca'.alogiie of Hemiptera .... p. 483. 1917. ArctocorUa ornata, Parshley, H. M. Dec. Papers of Boston Soc. Nat. Hist., VII, p. 117. 1923. Arrfororixa. ori.ata, .\bbott, J. F., in Guide to the Insects of Ck)nnecticut, Part IV, The Hemiptera or Sucking Insects of Connecticut, p. 389, fig. 36 (4), (10). 1926. Arctocoriia ornata, Blatrhley. W. S. Heteroptera of Eastern North America, pp. 1069-1071, PI. XII. fig. 10. 1928. Arctocorixa orna'a. Torre-Bueno, J. R. de la, in X List of the Inset-t* of New Vork, p. 141 (Cornell Univ. Agri. Exp. Sta. Memoir 101). 1930. Arctocorixa ornata, Walley, G. S. Can. Ejit., Vol. LXII, No. 12, p. 281. 1946. Arctocorixa. or»n.'a, Proct r. Win. Biol. Sur. of Mount Desert Region, Inc., Part VII, The Insect Fauna, p. 83 (estuary of Great Heath, Sta. F, 396, Mt. Desert Isld., Maine). Size: Length 8.1 mm. to 9.2 mm. Width across eyes 2.4 mm. to 2.6 mm. General shape long and fairly slender. Color: General facies varying from a little lighter than medium to almost black. Pronotum with 5 to 6 broad dark band.s, the apical three coalescent along lateral margins of disk; pale interspaces narrow, often less than half as wide as dark bands. In dark speci- mens, the clavus and corium black with pale areas along margins 632 The University Science Bulletin and along sutures, and with a few small, jiale splotches scattered through the dark areas; membrane with light and dark areas about equal. In lighter specimens the dark color is still dominant, but the pale areas are a little larger, more numerous, and arranged in trans- verse series, especially on clavus and distal half of corium. Em- bolium, head, limbs and venter pale in light specimens; smoky in dark specimens. Tarsal segments of hind legs sometimes suffused with red. The darker specimens are very striking in appearance. Structural characteristics: Head nearly four-fifths to as long as pronotal disk; interocular space narrower than width of an eye; inner margins of eyes divergent; vertex projecting beyond curve of eyes in both sexes as seen from above; face not haii*y; male fovea elongate oval, not very well defined; antennal segmentation: 1:2: 3 : 4 : : 22 : 20 : 48 : 30 ^^ ; 1 : 2 : 3 : 4 : : 25 : 20 : 50 : 32 ? . Pronotal disk angulate laterally and apically, median carina plainly visible on anterior third ; pronotum and hemelytra coarsely rastrate, the latter with a few pale hairs; pruinose area of embolar groove posterior to nodal furrow about two and one-half times as long as that of the claval suture. Lateral lobe of the prothorax elongate, sides parallel, tip truncate; mesoepimeron moderately broad with osteole half way between tip and lateral bend; thoracic region in- flated laterally as seen from above ; metaxyphus triangular, as broad as long, apex blunt. Front leg of female of usual shape except femur concave on inner side. Front leg of male: pala cultrate, blunt apically, with dorsal margin concave on basal third, peg row divided in middle with about 18 pegs in distal row and about 18 in basal one; tibia about a third as long as pala, almost as broad as long, appearing almost round, with no dorsal carina and with a small pad; femur flattened, with inner surface concave apically, and with about 10 rows of stridulatory pegs basally. Trochanter with a tumescence. Middle and hind legs slender, hind femur with several rows of pegs on dorsal surface, the proportions of segments as fol- lows: Middle leg: femur : tibia : tarsus : claw : : 100 : 45.5 : 33.3 : 45.5. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 83.2 : 117.2 : 37.8. Male asymmetry dextral; strigil large, elongate oval, of 7 regular combs. For details of male structures see text fig. 9. Note that the left clasper is thickly set with stout pegs. Female ab- domen with anal lobes deeply incised on inner ventral margin as shown in text figure. Comparative notes: This is a unique species. The deeply incised Western Hemisphere Corixidae 633 anal lobes of the female, a character previously overlooked, make this veiy different from any other species in Sigara. Location of types: Holotype male, labeled "Ithaca, N. Y., Aug. 26, 1891"; allotype female and 7 female paratypes labeled "Orono, Me., April 20, 1912, H. M. Parshley"; 4 female paratypes, same place, April 19, 1914, H. M. Parshley; 2 female paratypes; Cheshire, Conn., March 20, 1911, B. H. Walden; 1 female paratype, Amherst, Mass., Aug. 30, 1904. The holotype and allotype given to Francis Huntington Snow Collections. Others returned to Doctor Parshley. Data on distribidion: (Plate XCIX.) The published records in- clude Quebec and Ontario in Canada and Maine, Massachusetts, Connecticut and New York in the United States. Besides the type material we have studied the following: Canad.\: New Brunswick: St. Croix River, Oct. 23, 1893, W. C. Kendall, 2 males, 9 females. U. S. A.: Maine: Mt. Desert Island, Sept. 1, 1942, Wm. Proctor, 1 male. Massachusetts: (Uhler Coll.), 2 females; Wellesley, Oct. 22, 1902, 1 female. Fig. 9. Sigara {Xenosigara) ornala (Abbott); (a) pala of male; (b) loft cla.sper of male; (c) genital capsule of male; (d) ventral view of anal lobes of female abdomen; (e) dorsal view of male abdomen; (f) metaxyphus. 634 The Uxivp:rsity Science Billetix New York: Ithaca, Spencer Lake, July 4, 1918, 2 malc^, 2 fe- males; (Uhler Coll.), 1 male; Essex Co., July, 1916, 1 male. Rhode Island: (Uhler Coll.), 1 male. Neiv Jersey: Trenton, 1 male. 1 female; Paterson, 2 females; lona, July 7, 1938, J. C. Lutz III (Lutz Coll.), 2 males, 1 female. Oregon: (Uhler Coll.), 3 females (U. S. N. M.). Subgenus Pileosigara new. Shining rugulose species with cap-shaped head, hypo-ocular suture ending laterad of middle line of the eye, the infraocular portion of genae narrow. Subgenotype .S. douglasensis (Hungcrford). Sigara (Pileosigara) douglasensis (Hungerford) (Text fig. 10; wash drawing No. .32, Plate VI) 1926. Arctocorixa douglasensis Hungerford, H. B. Bull. Brook. Ent. .'^oc., \ol. XXI, p. 196, figs. 1, 5 and 8. 1936. Arctocorixa douglasensis, Walley, G. S. Can. Ent., Vol. LXVIII, No. 3, p. 62 (records Minn.). Size: Length 5.25 mm. to 5.8 mm. Width across eyes 1.57 mm. to 1.68 mm. Color: General facies light. Pronotum crossed by 6 or 7 dark bands, a little narrower than pale interspaces. Pattern of clavus and corium of alternate, wavy, longitudinal bands of dark and light color. Dark pigment light reddish brown, light pigment brownish yellow. Pattern of membrane almost obliterated, separated from corium by brownish line. Embolium, head, limbs, and body pale yellow. Structural characteristics: Head rounded, cap-shaped, four-fifths as long as pronotal disk, rear margin almost straight and bearing a median carina; postocular space at inner angles of eyes broader than in many corixids; inner margins of eyes nearly parallel; inter- ocular space narrower than the width of an eye; vertex rounded; face not hairy; male fovea scarcely discernible; female face some- what depressed; antennal segmentation: 1 : 2 : 3 : 4 : : 20 : 12 : 36 : 20 c? ; 1 : 2 : 3 : 4 : : 22 : 12 : 36 : 20 5 . Pronotal disk twice as broad as long, lateral and distal margins rounded; median carina visible on anterior third; pronotum rugulose to faintly rastrate; hemelytra smooth and shining, with scattered hairs; pruinose area of embolar groove posterior to nodal furrow equal in length to that of the claval suture. Lateral lobe of prothorax elongate, anterior distal angle produced, tip obliquely truncate; mesoepimeron with base inflated, partially concealing the lateral lobe of the prothorax. Western Hemisphere Corixidae 635 broad distally with osteole remote from tip; metaxyphus about half as broad at base as long, tip pointed. Front leg of female of usual shape, about 20 hairs in lower palmar row of pala. Front leg of male: pala cultrate, dorsal margin smoothly curved from base to claw. 26 pegs in row following dorsal curve; tibia half as long as pala, short dorsal carina and no pad; femur slender with about 8 rows of stout stridulatory \)eg,s on inner surface; trochanter with tumescence. Middle and hind legs slender; hind femur with 2 or, at the most, 3 stout pegs on distal portion of rear margin on ventral side; short row of additional pegs on ventral side; more than half of ventral side of femur pilose. Segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 35.8 : 26.9 : 35.8. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 77.2 : 100 : 40. Male asymmetry dextral; strigil large, elongate, of 6 regular combs; fifth segment with prestrigilar row of hairs; strigil itself surrounded by tufts of hair; median lobe of seventh abdominal seg- ment projecting toward left, subtriangular. Right clasper of male genital capsule sickle-shaped, of same width throughout. The left clasper broad and blunt at tip. For details of male structures see text fig. 10. Female abdomen normal. Comparative notes: This easily identified little species seems to stand quite alone. Location of types: Described from 29 specimens, 11 males and 18 females, taken by the writer from Bryant's Bog near Douglas Lake, Michigan, in July and August, 1923. Holotype, allotype, and some paratypes in the Francis Huntington Snow Collections, Uni- versity of Kansas. Other paratypes in the Museum of Zoology, University of Michigan, Ann Arbor, Michigan. Data on distribution: (Plate XCII.) We have examined the following: U.S.A.: Minnesota: Itasca Park, Aug. 21, 1922, H. B. Hunger- ford, 1 female; Minneapolis, Oct. 11, 1919, R. F. Hussey (Hussey Coll.), 5 males, 10 females. Michigan: Cheboygan Co., July 9, 1918, R. F. Hussey, 1 male, 2 females; same place and collector, Aug. 18, 1918, 6 males, 6 fe- males; Douglas Lake, Bryant's Bog, H. B. Hungerford, summer 1923, 9 males, 17 females; same place and collector, 1925, 13 males, 9 females; same place and collector, 1924, 1 male. Pennsylvania: Philadelphia, May 30, 1928, J. C. Lutz (Lutz Coll.), 1 male, 1 female. 636 The University Science Bulletin Ma}. 112-122, PI. IX (life history). 1917. Arctocorixa alternata, Van Duzee, E. P. Catalogue of the Heniiptera of America North of Mexico, p. 479. 1917. Arctocorixa erichsonii, Van Duzee, E. P. Catalogue of the Hemipt«ra of America North of Mexico, p. 480. 1917. Arctocorixa parshleyi, Van Duzee, E. P. Catalogue of the Heniiptera of America North of Mexico, p. 483. 1917. Arctocorisa alternata. Parshley, H. M. Occ. Papers of Bost. Soc. Nat. Hi^t., VII. p. 118 (Boston). 1923. A7-ctocorixa alternata. Abbott, J. F., in "Guide to the Insects of Connecticut," Part JV, "The Heniiptera or .Sucking Insects of Connecticut," p. 389, fig. 36 (11). (Haniden and New Haven, Conn.). 1923. Arctocorixa pan-hleyi. Abbott, .1. F., in "Guide to the Insects of Connecticut," Part IV, "The Hemiptera or Sucking Insects of Connecticut," p. 389, fig. 36 (12) (Connecticut). 1926. Arctocorixa alternata, Blatchley, W. S. Heteroptera of Eastern North America, pp. 1074, 1076, fig. 215, a; PI. XII, fig. 11. ("Common in northern Indiana": also recorded from North Carolina and New York. "Ranges from N. Eng. to 111. and south to Missouri.") 1926. Arctocorxa erichsonii, Blatchley, W. S. Heteroptera of Eastern North America, p. 1078 (Pennsylvania). 192G. Arctocorixa parshleyi, Blatchley, W. S. Heteroptera of Eastern North America. ii|i. 1074, 1077, fig. 12 (Maine, Rhode Island, New York and Pennsylvania). 1928. Arctocorixa alternata, Torre-Bueno, J. R. de la, in "A List of the Insects of N. Y.," Cornell Univ. Agri. Exp. Sta. Memoir 101, p. 141 (White Plains, L. I., Cold Spring Harbor, Flushing, and Maspeth). 1928. Arctocorixa parshleyi, Torre-Bueno, J. R. de la, in "A List of the Insects of N. Y.," Cornell Univ. Agri. Exp. Sta. Memoir 101, p. 141 (Ithaca, paratypes). 1928. Arctocorixa alternata, Hungerford, H. B. Ent. News, XXXIX, p. 156 (Torrence Co., N. Mex.). 1929. Si'jara parshleyi. Lundblad, O. Zool. Anzeiger, Bd. 80, Heft 7/9, pp. 193-196, text figs. 1-5. (Redescription ; specimen in Berlin Mus. taken in Massachusetts by Zimmer- mann). 1930. Arctocorixa aherna'a, Walley, G. S. Can. Ent. LXIII. Dec, |). 2S0 (Ottawa. Out., and St. Jean and Montreal Isl., Que.). 1932. Arctocorixa alternata. Ricker, Wm. E. Studies of Trout Producing Lakes and Ponds, publ. of Ontaria Fisheries Res. Lab. No. 45, p. 132, in Univ. of Toronto Biol. Series 36. (Records from stomach of trout.) 1938. Arctocorixa alternata. Briniley, C. S. Insects of North Carolina, p. S4. 1939. Arctocorixa alternata. Millspaugh, Dick D. Field and Laboratorx', \'ol. \'n. No. 2, May, pp. 84-85 (Dallas Co., Texas). 1945. Corixa alternata, Griffith, M. E. Univ. of Ivans. Sci. Bull. XXX, Pt. II, No. 14, p. 251. [Cites Forbes' 18176 reference for species laj'ing eggs on crayfish; = R. acuminata (Uhler).] Size: Length 5.5 mm. to 6.9 mm. Width across eyes 1.7 mm. to 2 mm. Color: General facies medium brown, sometimes with reddish tinge. Pronotum crossed by 8 to 9 narrow, brown bands, some of them only across median portion of disk, others complete, distal ones tending to coalesce along lateral edges. Claviis banded Western Hemisphere Corixidae G55 with alternate light and dark stripes of equal width. Corial pattern much broken, giving a mealy appearance — light and dark lines scattered, wavy, and broken; dark coloring tending to coalesce on inner distal angle of corium. This last is very characteristic of alternata. Membrane separated from corium by a pale line ; pattern similar to that of corium. Embolium, head, limbs, and margins of venter pale. Area around coxae and basal segments of abdomen smoky to black. Structural characteristics: Head about half as long as the pro- notal disk; interocular space narrower than the width of an eye; vertex smoothly rounded in both sexes as seen from above, not pro- jecting beyond curve of eyes; male fovea ovate, shallow, broad, almost attaining eyes laterally; antennae: 1 : 2 _: 3 : 4 : : 20 : 15 : 38 : 32 J ; 1 : 2 : 3 : 4 : : 21 : 14 : 40 : 32 " $ . Pronotal disk angulate laterally, rounded distally ; median carina barely visible on anterior third ; pronotum and hemelytra heavily rastrate, the latter with numerous long hairs on corium and membrane; pruinose area of embolar groove posterior to the nodal furrow slightly longer than that of the claval suture. Lateral lobe of prothorax elongate, sides parallel, apex somewhat rounded. Mesoepimeron at level of osteole narrower than the length of the last antennal segment; osteole close to tip of mesoepimeron. Metaxyphus plainly broader than long. Front leg of female of usual shape. Front leg of male: pala thin, rather broad compared to length, broadest across base, with about 42 pegs lying close to dorsal margin ; tibia about two-thirds as long as pala, with dorsal carina, and a narrow pad; femur slender with pilose area on inner surface. Middle and hind legs slender; the proportions of segment to segment as follows (ave. 4 males, 4 fe- males) : Middle leg: femur : tibia : tarsus : claw :: 100 : 45.1 : 31.5 : 42.1. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 92.9 : 114.2 : 42.8. Male asymmetry dextral; strigil small, almost round, of seven fairly regular combs. For details of male structures see Plate XCIII, figs. 2, 2a, and 2b. Female abdomen normal. Com-parative notes: This is a very common species, separated from its relatives as indicated in the key. Location of types: Original type lost. No. 105 in the Harris Col- lection was determined by Say and is this species. We have set up a neotype male, labeled "St. Louis, Mo., Oct. 1911, J. F. Abbott." This is in the F. H. Snow Entomological Collections, University of Kansas. Typ' s of erichsonii Fieb. are sujijiosed to be in Halle, Ger- 656 The University Science Bulletin many, and in the museum at Berlin but were not to be found in either place in 1928 when I visited these museums. Types of A. parshleyi Abbott : holotype male, allotype female, and 1 female para- type, labeled "Providence, R. I.. 6/18 (Davis, Coll.)"; 1 male, "Ith- aca, N. Y., July 20, 1904"; 1 female, "Ithaca, X. Y., Aug. 6, 1904"; 4 females, "Orono, Me., Sept. (Exch. Coll. Me. Exp. Sta.)"; the above series given by Doctor H. M. Parshley to the Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution (Plate XCVII) : Canada: Nova Scotia: Truro, Aug. 5, 1913, R. Matheson, 1 male, 1 female. Quebec: Montreal Island, 1 female. Ontarw: Thunder Bay Beach, July 9, 1941, H. S. Parish (Lutz) ; Toronto, May 9, 1930, E. C. Oakley (Lutz). Manitoba: Aweme, Oct. 11, 1916, Norman Criddle (Walley rec- ord) ; Winnepeg, May 15, 1909, J. B. Wallis (Wallis Coll.), 2 males, 1 female; Stony Mts., May 28, 1910, same collector and collection, 2 males, 2 females; Roland, May 24, 1909, same collector and col- lection, 3 males, 2 females; Westbourne, Sept. 4, 1910, same collector and collection, 2 males, 2 females; Treesbank, July 25, 1910, same collector and collection, 2 females; Red Deer R., Aug. 3, 1937, R. H. Beamer, 2 males; Hartney, July 31, 1937, same collector, 6 males, 6 females; same place and date, H. T. Peters, 8 males, 8 females; Mafeking, Aug. 3, 1937, same collector, 1 male, 2 females; Russell, Aug. 1, 1937, same collector, 1 male; MacDonald, Aug. 9, 1937, same collector, 14 males, 22 females; Oakner, July 31, 1937, C. L. John- ston, 1 male; Clear Lake, Aug. 8, 1937, same collector, 2 females. Saskatchewan: Pelly, Aug. 2, 1937, R. H. Beamer, 4 males, 1 fe- male; Qu'appelle R., 1940, D. S. Rawson, 1 male. Alberta: Lethbridge, July 23, 1915, E. H. Strickland (Walley's record) ; same place. May 13-20, 1930, J. H. Pepper (Walley's rec- ord) ; Medicine Hat, July 23, 1930, same collector (Walley's record) ; Orion, June 29, 1930, same collector (Walley's record) ; Macleod, Sept. 15, 1928, Owen Bryant (Bryant) ; Medicine Hat, June 11, 1920, 1 male; Edmonton, May 6, 1924, Owen Bryant (Bryant), 1 female. N. W. T.: 1 male. U. S. A.: New Hampshire: Durham, Sept. 20, 1901, 1 male, 1 fe- male. Neiv York: Putnam Co., 1903 (Bueno Coll.), 2 males, 2 females; Bronx Park, same collection, 1 male, 2 females; McLean, July 17, Western Hemisphere Corixidae 657 1929, 1 male; Ithaca, Aug. 6-S, 1935, 2 males; Watkins Glen, L. I., Mrs. A. T. Slosson, 2 females; (Uhler Coll.), 1 male, 2 females; Ithaca, April, H. B. Hungerford, 4 males, 6 females; Rochester (Uhler Coll.), 1 female; White Plains, Aug. 29. 1908. 2 females; Long I., Sept. 25, 1937, J. C. Lutz (Lutz Coll.), 1 male, 1 female; Cyprus Hills, L. I., 1905, via C. J. Martin, 1 female; Batavia, 1913, H. H. Knight, 2 males, 3 females; W. Shokan, July 30, 1909, 2. fe- males; Ithaca, Nov. 17, 1889, 8 males, 13 females; New York, 2 males, 3 females; Long Island, Queen's Village, Aug. 8, 1941, J. C. Lutz (Lutz); Cranberry Lake, July 24, 1919 (Drake Coll.), 2 fe- males; Ithaca, Aug. 26, 1891 (Cornell), 2 males, 1 female. Massachusetts: Northampton, Oct. 9, 1920, Louise Smith, 1 male, I female; Wellesley (Uhler Coll.), 1 female; Hartville, Aug. 11, 1930, J. R. de la Torre-Bueno (Bueno), 1 male; (Uhler Coll.), 1 female; Forest Hills, Nov. 1, 1915, H. M. Parshley (Parshley); Forest Hills, Oct. 21, 1921, R. F. Hussey (Hussey Coll.), 1 male. Rhode Island: C. F. Baker, 1 female. New Jersey: Palisades, Aug. 9-18, 1903 (Kirk. Coll.), 2 males, II females; Lakehurst, Aug. 17, 1912, 1 female; lona, July 22, 1941, J. C. Lutz (Lutz). Maryland: Sabillasville, Aug. 20 (Uhler Coll.), 2 females; Cabin John, Aug. 5, 1944, R. I. Sailer (Nat. Mus.), 1 male, 1 female. District of Columbia: (Uhler Coll.), 1 male; Washington, May 18, 1903, W. V. Warner, 2 females; same place, D. H. demons, 1 fe- male; same place (0. Heidemann, Cornell U.). Virginia: New Church, July 15, 1934, L. D. Anderson, 3 females; Church Bridge, Aug. 30, 1906, D. H. demons, 2 males. North Carolina: Raleigh, Nov. 22, 1904 (0. Heidemann, Cornell U.), 1 female. West Virginia: Morgantown, Aug., 1923, 3 males; Preston Co., Aug. 26, 1928, 1 female; Kanawha Co., July, 1935 (Carn.), 1 male, 1 female. Pennsylvania: Philadelphia, June 26, 1941, J. C. Lutz (Lutz Coll.), 14 males, 34 females; same place, collector and collection, 1929, 3 males, 6 females; same place, collector and collection, 1928, 1 male, 2 females; Newton Sq., July 1, 1941, same collector and col- lection, 2 males, 1 female; Philadelphia, May, 1906, H. Hornig, 1 female; Cameron, Aug. 21, 1946, L. D. Beamcr, 2 males; Phila- delphia, May 2, 1929, J. C. Lutz (Lutz), 1 male; same place. League 42—822 65« The University Science Bulletin ' Isl. Park. June 26, 1941, J. C. Lutz (Lutz) ; same place, Morris Park, May 24, 1929, same collector and collection; Delaware Co., New- town 8q.. July 1, 1941, same collector and collection; Pennsylvania, H. S. Klages, 1 female. Ohio: Lucas Co., 6 mi. w. of Toledo, Sept. 16, 1937, J. J. Friauf (Mich. Coll.), 4 males, 7 females; Berea, Oct. 19, 1911. C. J. Drake (Drake) ; Hocking Co., July 7, 1916, same collector and collection; Columbus, Oct. 2, 1914, same collector and collection; Tiffin, Aug. 26, 1916, same collector and collection; Delaware, June 26, 1916, same collector and collection; Columbus, July 7, 1930, C. H. Hicks (Lutz). Indiana: Miller, Aug. 24, 1918, C.L. Hubbs (Field Mus.), 1 male, 1 female; Jasper Co., May 23, 1932, Wolcott (Field Mus.), 1 male; Mineral Springs, July 4, 1910, A. B. Wolcott (Field Mus.), 1 female; (Kirkaldy Coll.), 1 female. Michigan: Berrien Co., E. K. Warren Preserve, July-Aug., 1920, R. F. Hussey, (Hussey Coll.), 11 males, 20 females; same place, collector and collection, June-Aug., 1919, 9 males, 12 females; (Uhler Coll.), 2 females; Druid Hill (Uhler Coll.), 1 male; Cheboygan Co., June 20, 1934, H. B. Hungerford, 1 male; same place and collector, July 30, 1939, 1 male, 3 females; Temperance Pt., L. Mich., July 9, 1924, same collector, 7 males, 4 females; Hat Island, L. Mich., July 4, 1943, same collector, 9 males, 8 females; Lake Gogebic, Aug. 15, 1937, C. L. Johnston, 1 male; Isle Royale, Aug., 1905, Adams (Mich. Coll.), 1 female; Ann Arbor, July, 1910 (Mich. Coll.), 8 males, 14 females; Washtenaw Co., May 25, 1918, F. M. Gaige (Mich. Coll.), 2 males, 7 females; Oceana Co., Silver L. State Pk., July 26, 1934, Olson and Gloyd (Mich.), 4 males, 1 female; Charlevoix Co., Beaver Island, Sept. 7-8, 1922, R. F. Hussey (Mich.), 19 males, 22 females; Huron Co., Pigeon Lake, July 3, 1922, R. F. Hussey (Mich.). 1 male, 1 female; Pentwater, July 17, 1916, E. Liljeblad (Field Mus.), 1 female; Ann Arbor, March 7, 1894, Wolcott (Nebr. Coll.). 1 male, 1 female; Battle Creek, Aug. 22, 1920, Priscilla Butler (Hussey); Douglas Lake, East Fish Tail Pool, July 26, 1923, H. B. Hungerford, 1 female; same place and collector, Sedge Point Pool, July 3, 1923, 2 females; same place and collector, Bryant's Bog, July 12, 1924, 3 males, 1 female; same place and collector. Mud Lake, July 31, 1923, 1 male; same place and collector, July, 1927, 13 males, 25 females. Illinois: Palos Park, Sept. 13, 1908, W. J. Gerhard (Field Mus.), 1 femal(>: So. Chicago, Sept. 14, 1902, same collector and collection. Western Hemisphere Corixidae 659 8 males^ 8 females; Chicago, Sept. 9, 1906, same collector and col- lection, 6 males, 10 females; Desplaines R. (Biieno Coll.), 2 males, 1 female; Chicago, 1904, same collection, 1 male, 1 female; Havana, Nov. 12, 1895, Hempel and Kofoid, 7 males, 8 females (111. Nat. Hist. Coll.); Ogle (Uhler Coll.), 1 male, 3 females; Normal, same collection, 1 male; same collection, 1 male; Chicago, C. T. Brues (Parshley) ; Palos Park, Sept. 14, 1913, W. J. Gerhard (Field Mus.), 2 males, 1 female; Gorham, Aug. 8, 1932, same collector and collec- tion, 1 female; Lake Forest (Cornell), 1 male; Havana, Feb. 28, 1896, Hart and Taylor (111. Nat. Hist. Coll.) ; same place and col- lection, June 1, 1895, Hart; same place and collection, July 6, 1894, Hart; same place and collection, Jan. 24, 1896, Hempel; same place and collection, July 11, 1896, Hempel; same place and collection, July 6, 16, 1897, Hart; same place and collection, March 2, 1895, Hart; same place and collection, Dec. 23, 1895, Hempel; same place and collection, July 21, 1897, Hart; same place and collecticm, Aug. 11, 1894, Hart and Forbes; same place and collection, March 21, 1895, Hart; same place and collection, Oct. 11, 1894, Hart; same place and collection, Aug. 23, 1894, Hart, Smith, Newberry; same place and collection, Oct. 9, 1894, Hart; same place and collection, May 31,1894, Hart. Missouri: St. Louis, May, 1910, J. F. Abbott (Abbott Coll.), 6 males, 17 females; same place, June 10, 1919, W. V. Warner, 1 male, 2 females; (Uhler Coll.), 3 females; Kansas City, March 27, 1897, F. J. Hall, 1 female; Columbia, March 29, 1936, W. M. Gordon, 2 males, 4 females. ' Arkansas: Washington Co., July 10, 1927, D. Isely, 3 males, 2 fe- males. Texas: (Riley Coll.), 4 females; Colorado Co., July 3, 1922, H. B. Hungerford, 1 male; Randall Co., July 7, 1927, R. H. Beamer, 15 males, 25 females; Valentine, July 13, 1927, same collector, 4 males; Colorado Co., April 25, 1922, Grace Wiley, 10 males, 21 fe- males; same place and collector, April 3, 1922, 3 males, 4 females; same place and collector, April 24, 1922, 2 females; same place and collector, May 5, 1922, 3 females; Eastland Co., May 24, 1921, same collector, 4 males, 3 females; Ft. Davis, July-Aug., 1928, Mrs. 0. C. Poling, 3 males, 1 female; Howth, May 30 (Uhler Coll.), 7 fe- males; (Uhler Coll.), 2 males, 3 females; Victoria, Dec. 27, 1910, J. D. Mitchell, 1 female; Brewster Co., S. G. Ranch, April 15-30, 1936, O. C. Poling (Mich.), 7 males, 2 females. Oklahoma: Cimarron Co., Kenton, Julv 8, 1926, T. H. Hubbell 060 The University Science Bulletin (Mich. Coll.), 1 male, 2 females; Ardmoie, April 14, 1923, H. B. Hungerford, 3 males. Ka7}sas: Franklin Co., May 13, 1927, Wesley Clinton (Mich. Coll.), 3 males; Onaga, 6 females; Clay Co. (Drake Coll.); Law- rence, May 6. 1937, L. J. Lipovsky, 2 females; Thomas Co., 3,150 ft., F. X. Williams, 2 males, 2 females; Douglas Co., April 29, 1936, L. J. Lipovsky, 1 male; Topeka, May 28, 1923, R. H. Bearaer, 1 male. 9 females; Decatur, July 6, 1926, same collector, 2 females; Scott Co., June 21, 1925, same collector, 10 males, 20 females; same place, June 20, 1925, H. 0. Deay, 8 males, 8 females; Hamilton Co., 3,350 ft., F. H. Snow, 1 male; Republic Co., July 11, 1925, R. H. Beamer, 11 males, 18 females; Norton Co., July 7, 1925, same col- lector, 1 female; Medora, June 24, 1936, D. R. Lindsay, 1 female; Gove Co., 2,813 ft., F. X. Williams, 2 males, 2 females; Medora, June, 1923, C. 0. Bare, 1 female; Baldwin, June, J. C. Bridwell, 2 males, 2 females; Douglas Co., F. H. Snow, 2 males, 1 female; same place, L. J. Lipovsky, 1 female; Greeley Co., 3,550 ft., F. X. Williams, 3 males, 5 females; Saline Co., July 18, 1923, R. H. Beamer, 2 males, 3 females; same place, July 14, 1923, L. C. Wood- ruff, 1 male; Norton Co., July 5, 1935, H. J. Grady, 1 female; Miami Co., 1915, R. H. Beamer, 1 female; Wilson Co., Aug. 2, 1923, Beamer and Lawson, 1 female; Srdgwick Co., 1,291 ft., 1916, R. H. Beamer, 2 females; Barber Co., 1,468 ft., 1916, same collector, 2 females; Cowley Co., March 16, 1921, W. E. Hoffmann, 1 male, 10 females; Douglas Co., Jan. 23, 1921, same collector, 1 male, 6 females; same place, Stubbs Pond, May 17, 1920, H. B. Hungerford. 40 males, 43 females; Douglas Co., Feb. 23, 1921, H. B. Hungerford, 10 males," 25 females; same place and collector, Feb. 15, 1921, 15 males, 8 fe- males; same place, Oct. 28, 1921, Robert Guntert, 112 males, 194 fe- males; same place, March, 1923, H. B. Hungerford, 7 males, 12 fe- males; same place and collector. May 24, 1921, 1 male, 2 females; same place and collector, Nov. 3, 1922, 10 females; same place, Stubbs Pond, Nov. 27, 1922, same collector, 2 males, 12 females; same place and collector, April 8, 1921, 64 males, 120 females; same place and collector, 4 males, 7 females; same place. May 10, 1919, W. E. Hoffmann, 42 males, 67 females; same place and collector, July 6, 1920, 1 female; same place, 900 ft., R. H. Beamer, 1 female; same place, July 29, 1919, W. E. Hoffmann, 1 male; same place, May 17, 1916, H. B. Hungerford, 1 male, 1 female; same place and collector. May 30, 1916, 43 males, 57 females; same place, June, taken at light, 1 male, 1 female; Wallace Co., 3,440 ft., F. X. Wil- Western Hemisphere Corixidae 661 liams, 3 males; Thomas Co., 3,150 ft., same collector, 1 male, 2 fe- males; Decatm- Co., 2,560 ft., same collector, 6 males, 4 females; same place, July 8, 1926, R. H. Beamer, 2 males, 7 females; Chero- kee Co., Dec. 28, 1923. R. H. Beamer, 1 female; Butler Co., 1.285 ft., 1916, same collector, 1 male; Republic Co., July 11, 1925, same collector, 3 females; same place and date, H. J. Grady, 3 females; Allen Co., April 24, 1921, W. E. Hoffmann, 6 females; Woodson Co., Feb. 24, 1921, same collector, 3 males, 3 females; Atchison Co., July 11, 1924, R. H. Beamer, 5 males, 9 females; same place and date, E. P. Breakey, 4 males, 7 females; Scott Co., June 25, 1925, R. H. Beamer, 1 female; same place, June 22, 1925, Howard Deay, 2 males, 6 females; Topeka, May 26, 1923, H. B. Hungerford, 3 males, 3 females; Pratt Co., April 12, 1925, R. H. Beamer, 1 male, 11 females; Lyons Co., June 14, 1923, C. 0. Bare, 3 females; same place, June 15, 1923, R. H. Beamer, 1 female; Kiowa Co., July 4, 1923, same collector, 1 female; same place, July 1, 1923, C. H. Mar- tin, 1 female; Medora, July 3, 1927, L. D. Anderson, 2 males; same place. Sand Hills, June 25, 1923, R. H. Beamer, 1 male; same place, Aug. 27. 1925, at light, W. Brown, 2 females; Hodgman Co., July 17-25, 1917, 7 males, 10 females; Meade Co., 2,500 ft., F. X. Wil- liams, 6 males, 6 females; Sherman Co., 3,690 ft., same collector, 12 males, 1 female; Sheridan Co., 2,650 ft., same collector, 1 female; Wichita Co., 3,300 ft., same collector, 5 males; Cheyenne Co., 3,300 ft., 1 male, 1 female; Rawlins Co., 2,850 ft., same collector, 1 male; Gove Co., 2,813 ft., same collector, 6 males, 2 females; Neosho Co., 900 ft., June 26, 1920, W. E. Hoffmann, 1 male, 1 female; Ellsworth Co., July 12, 1923, C. H. Martin, 1 male; Smith Co., July 9, 1925, H. J. Grady, 1 male; Leavenworth Co., June 25, 1924, E. P. Breakey, 2 males, 1 female; McPherson Co., Clarence Bare, 1 female; Chey- enne Co., July 2, 1925, H. J. Grady, 3 males, 1 female; Osage Co., June, 1923, C. 0. Bare, 4 females; same place, June 15, 1923, R. H. Beamer, 4 males, 7 females; Manhattan, Sept. 13, 1923, H. B. Hun- gerford, 1 male; Dickinson Co., July 19, 1923, R. H. Beamer, 3 males; Morton Co., July 20, 1924, C. 0. Bare, 1 male, 4 females; Montgomery Co., 708 ft., 1916, R. H. Beamer, 3 females; Cold- water, June 19, 1927, H. B. Hungerford, 1 female; Douglas Co., trap light, summer 1930, P. B. Lawson, 1 male, 6 females; same place, Lake View, Oct. 3. 1925, H. B. Hungerford, 3 males, 4 fe- males; same place, Stubbs Pond, Nov. 27, 1922, H. B. Hungerford, 2 males, 3 females; same place and collector, Nov. 3, 1922, 5 males, 4 females; Leavenworth Co., July 10, 1924, E. P. Breakey, 1 fe- 662 The University Science Bulletin male; Coldwater, June 19, 1927, H. B. Hungerford, 2 males, 1 fe- male; Lawrence, trap light, July, 1935, L. S. Henderson, 18 males, 25 females. Nebraska: Lincoln, Nov., 1923, Owen Bryant (Bryant Coll.), 2 males, 1 female; same place, March 14, J. T. Zimmer (Neb. Coll.), 1 male, 4 females; same place, Oct. 1, 1898, Hart (111. Nat. Hist. Coll.). Iowa: Keokuk, June, Shaffer, 1 female; Burlington, H. G. Grif- fetts, 1 female; (0. Heidemann, Cornell U.), 2 males, 1 female. Wisconsin: Black River Falls, 1,896, 1 female; Dane Co., L. Wingra, April 19, 1930, E. P. Breakey, 2 males, 5 females; Lafay- ette Co., Argyll, Sept. 6, 1927, Creaser and Griffeth (Mich.), 1 fe- male; Burnett Co., Clara R. nr. Webster, Aug. 13, 1938, Shultz and Tarzwell (Mich. Coll.), 1 female; Brule, Aug. 16, 1937, C. L. Johns- ton, 1 male, 1 female; Fond du Lac Co., Grand R., Fairwater, Aug. 28, 1925, Creaser and Jones (Mich.), 1 female; Sauk Co., Baraboo R., Aug. 31, 1927, Creaser, Stewart and Griffith (Mich.), 1 male, 6 females. Minnesota: St. Paul, golf pond, July 14, 1921, H. B. Hungerford (Minn.), 10 males, 9 females; same place, June 14, 1921, W. E. Hoffmann (Minn.), 3 males, 9 females; Ramsey Co., L. Owasso, June 22, 1921, W. E. Hoffmann (Minn.), 2 females; Lake City, June 25, 1921, same collector and collection, 2 males, 1 female; Olivia, June 28, 1921, same collector and collection, 1 male, 2 females; De- troit L., fish hatchery, Oct. 22, 1941, M. E. Griffith, 60 males, 85 females; Becker Co., Shell Lake, Aug. 22, 1922, H. B. Hunger- ford, 18 males, 24 females; Pelican Rapids, Aug. 22, 1922, same collector, 13 males, 19 females; Carlson, Aug. 8. 1922, same collec- tor, 26 males, 31 females; Two Harbors, Aug. 9, 1922, same col- lector, 1 female; Rochester, July 16, 1922, same collector, 6 females; Beaver Dam, Aug. 12, 1922, same collector, 1 female; L. Isabella R., Aug. 14, 1922, same collector, 1 female; Benson, Aug. 23, 1922, same collector, 2 males, 2 females; Minneapolis, July 22, 1921, same collector, 1 female; St. Paul, golf pond, summer, 1921, same col- lector, 39 males, 59 females; same place, June 29, 1931, A. A. Granovsky, 1 male, 3 females; same place and collector, July 16, 1932, 2 males, 1 female; same place and collector, summer, 1934, 5 males, 10 females; same place and collector, summer, 1933, 17 males, 15 females; Faribault, June 14, 1934, same collector, 3 males, 2 females; Cannon Falls, Aug. 16, 1934, J. D. Pletch, Western Hemisphere Corixidae 663 1 male; Cooley, Aug. 13, 1937, C. L. Johnston, 5 males, 1 female; Hennepin Co., Minnehaha Creek, July 9, 1921, H. B. Hungerford, 17 males, 21 females; Stephen, Aug. 10, 1937, H. T. Peters, 4 males, 6 females; Ramsey Co., April 20, 1933, J. D. Pletch, 3 males, 1 female; St. Paul, June, 1921, W. E. Hoffmann, 24 males, 45 females (Minn. Coll.) ; same place, collector and collection, Aug. 16, 1921, 3 males, 3 females; same place, collector and collection, Oct. 13, 1921, 1 female; Princeton, July 20, 1921, same collector and col- lection, July 20, 1921, 5 males, 1 female; Bird's Island, Aug. 25, 1921, same collector and collection, 2 males, 3 females; Minneapolis, Aug. 17, 1921, same collector and collection, 5 males, 5 females; Hennepin Co., Oct. 20, 1921, same collector and collection, 4 fe- males; Koochicking Co., Rainy L., Aug. 20, 1932, S. Moore (Mich.), 5 females. North Dakota: Fargo, ditch w. of N. D. Ag. Coll., May 3, 1941, M. E. Griffith, 2 males, 15 females; Sanborn, July 27, 1937, C. L. Johnston, 3 males, 5 females; same place and date, H. T. Peters, 5 males, 6 females; same place and collector,- July 23, 1937, 8 males, 7 females; Tappen, July 23, 1937, R. H. Beamer, 9 males, 20 fe- males; same place and date, C. L. Johnston, 7 males, 4 females; Northwood, July 27, 1937, H. T. Peters, 15 males, 17 females; Tokio, July 28, 1937, R. H. Beamer, 36 males, 38 females; DriscoU, July 23, 1937, H. T. Peters, 4 males, 6 females; same place and date, C. L. Johfiston, 9 males, 2 females; Knox, July 28, 1937, same collector, 1 male; L. Metagoshe, July 30, 1937, Peters, 6 males, 3 females; same place and date, R. H. Beamer, 8 males, 4 females; same place and date, C. L. Johnston, 1 female; Linton, July 23, 1937, H. T. Peters, 11 males; same place and date, R. H. Beamer, 1 male, 1 female; same place and date, C. L. Johnston, 5 males, 6 females; McVille, July 27, 1937, same place, 1 male, 2 females; same place and date, R. H. Beamer, 1 male, 2 females; Fargo, July 26, 1937, C. L. Johnston, 2 males, 4 females; same place and date, H. T. Peters, 2 males, 1 female; Omemee, July 29, 1937, same collector, 4 males, 9 females; Devil's Lake, Aug. 20, 1920, R. F. Hussey (Hussey Coll.), 12 males, 6 females; Ramsey Co., L. L-win, Aug. 21, 1922, T. L. Hankinson (Mich. Col), 4 females; Nelson Co., Stump L., Aug. 25, 1922, same collector and collection, 3 males, 7 females; Devil's Lake, Aug. 26, 1919, A. Olson (Mich.), 1 male. South Dakota: Redfield, July 20, 1937, R. H. Beamer, 11 females; Wasta, July 17, 1937, same collector, 10 males, 10 females; same place and date, C. L. Johnston, 1 male, 1 female; same place and 664 The University Science Bulletin date, H. T. Peters, 3 males, 1 female; Columbus, Sept. 24, 1939, G. B. Spawn, 3 males, 2.females; Weta, July 18, 1937, C. L. Johnston, 5 males, 1 female; same place and date, R. H. Beamer, 7 males, 5 females; same place and date, H. T. Peters, 3 males, 4 females; Piedmont, July 17, 1937, same collector, 8 males, 3 females; same place and date, R. H. Beamer, 10 males, 17 females; same place and date, C. L. Johnston, 1 male, 1 female; Draper, July 19, 1937, R. H. Beamer, 3 females; Burdette, July 20, 1937, C. L. Johnston. 1 male, 1 female; Houghton, July 22, 1937, C. L. Johnston, 1 male, 1 female; Houghton. July 22, 1937, R. H. Beamer, 1 male, 6 females; Bradley, July 21, 1937, H. T. Peters, 7 males, 4 females; Eureka, July 22, 1937, same collector, 9 males, 2 females; Miller, July 20, 1937, same collector, 1 male, 6 females; same place and date, R. H. Beamer, 3 males, 3 females; Eden, July 21, 1937, same collector, 3 males, 4 females; same place and date, H. T. Peters, 6 males, 4 females; Bliint, July 19, 1937, R. H. Beamer, 5 males, 1 female; Jordan, June 13. 1942, G. B. Spawn (Severin Coll.) ; Chamberlain, July 22, 1942, H. C. Severin, same collection; Artesian, June 26, 1942, same collector and collection; Eden, June 20, 1942, G. B. Spawn, same collection; Presho, July 13, 1942, H. C. Severin, same collection; Bowdle, Aug. 11, 1942, same collector and collection; Roswell, Aug. 13, 1942, same collector and collection; Wessington, Aug. 12, 1942, same collector and collection; Ft. Thompson, Aug. 25, 1942, same collection and collector; Britton, June 4, 1942, same collector and collection; White Lake, June 6, 1942, same collector anil collection; Platte, June 31. 1942, same collector and collection; Blue Dog Lake, Waubay, May 1. 1942, same collector and collection; Pringle, road- side pool, July 3, 1937, M. W. Sanderson, 4 males, 7 females. New Mexico: Upton, July 20, 1941 (Nat. Mus.t, 4 males, 5 fe- males; (Uhler Coll.), 1 female; Torrcnce Co., summer 1925, C. A. Martin; AVagonmound, July 18, 1936, M. B. Jackson, 6 males, 4 females; Grady, July 16, 1936, same collector, 1 male; same jilace and date, R. H. Beamer, 3 males, 3 females; Organ, .luly 3, 1940, same collector, 3 females; Santa Fe, July 20, 1936, J. D. Beamer, 2 f emales ; ' Eddy Co., July 9, 1927, P. A. Readio, 1 female; Organ, July 3, 1940, D. E. Hardy, 1 male. Colorado: (Kirk. Coll.), 1 male; (Uhler Coll.), 1 male, 2 females; Mineral Co.. Continental Divide, June 20, 1919, 1 male, 1 female; Pingree Park, Aug., 1925, Beamer and Lawson, 3 males, 1 female; same place, Aug., 1924, P. B. Lawson, 2 females; Boulder, June 28, 1931, L. D. Anderson. 5 males, 6 females; Lamar, Aug. 22. 1927, Western Hemisphere Corixidae 665 P. A. Rcadio, 1 male; Hillside, 6 mi. S., Aug. 25, 1941, H. C. Severin; Boulder, July 11, 1932, C. H. Hicks (Lutz). Wyoming: Yellowstone Park, Aug. 29, 1890, 2 females. Washington: Mason Co., L. Cushman, July 12, 1919, F. :\1. Gaige (Mich. Coll.), 4 females. California: Onyx. July 23, 1940, L. C. Kuitert, 1 male, 2 females; Yuba Co., Coquiilett, 1 male, 1 female; (Uhler Coll.), 1 male, 4 females. Arizona: Chiricahua Mts., July 5, 1940, L. C. Kuitert, 1 female. Sigara (Vermicorlxa) stigtnatica (Fieb.) (Plate XCIV, figs. 2, 17, 19, 23, 27) 18.51. Corisa stigmatica Fieber, F. X. Species Generis Corisa, p. 30, Tab. II. fig. 22 ("N. Am."). 1009. Arctocorina stigmatica. Kirkalch', G. W., and Toire-Bueno, J. R,. de la. Catalogue in Proc. Ent. Soc. Wash., Vol. X, p. 197. 1917. Arcfocorixa stigniutira. Van Duzee, E. P. Cat. of Hem. of Am. N. of Mex., p. 484. 1939. Arcfocorixa stigmaiica, Millspavigh. Dick D. Field and Laboratory. Vol. ^TI, No. 2, May, p. 85 [probably is Sigara modesta (Abbott)]. Size: Length 4.6 mm. Width across eyes 1.5 mm. Color: General facies medium brown. Pronotum crossed by 6 dark bands, a little narrower than pale interspaces; dark bands not extending all the way to margins and distal ones not tending to coalesce. Clavus irregularly cross-banded; dark bands narrow and transverse basally and distally ; in center, thicker and more irregular. Corial pattern broken and irregular; dark color tending to coalesce into longitudinal line close to claval suture; elsewhere, light and dark patches alternating in about ecjual portions. Membrane sepa- rated from corium by pale line; pattern reticulate. Embolium, licad and limbs pale; abdominal venter nearly black. Structural characteristics: Head about four-fifths as long as pro- notal disk; interocular space narrower than the width of an eye; male vertex slightly produced beyond eye curve as seen from above ; face not hairy; male fovea poorly defined. Since we have only the type specimen, no attempt was made to dissect out the antennae. Pronotal disk rounded laterally and distally, median carina plainly visible on anterior third; pronotum and hemelytra moderately ras- trate, the latter without hairs; pruinose area of embolar groove posterior to nodal furrow equal in length to that of claval suture. Lateral lobe of prothorax elongate, sides nearly parallel, tip rounded; mesoepimeron broad with osteole almost at lateral bend ; metaxyphus about as broad as long, apex blunt. Front leg of male: Pala long and slender, about two and one-half times as long as broad, 36 pegs 666 The University Science Bulletin in a single row as in Plate XCIV, fig. 17; tibia about half as long as pala, with a short dorsal carina and a small pad; femur slender with pilose area on inner surface extending two-thirds of way from base and followed by a small patch of short bristles. Middle and hind legs missing. Male asymmetry dextral; strigil small, of 3 regular combs. For details of male structures see Plate XCIV. figs. 2, 17, 19, 23 and 27. Comparative notes: We have not found, in all our collecting, any specimens exactly like the one we have chosen as the lectotype. There are several close forms that we consider as sibling species and these are separated in the key. Location of types: We have set up as lectotype a male specimen belonging to the Vienna Museum, labeled "Nord Amer." Data on distribution: So far we have been unable to discover where in North America this form was taken. Sigara {Vermicorixa) modesta (Abbott) (Plate XCIV, figs. 1, 4, 7, 8, 13, 14, 16, 18, 20, 21, 22) » 1916. Arctocorisa modesta Abbott, J. F. Ent. News, XXVII, p. 343 (Washington, D. C. Maryland and Virginia). 1917. Arctocorixa modesta. Van Duzee, E. P. Catalogue of the Hemiptera, p. 482. 1920. Arctocorij-a modesta, Blatchley, W. S. Heteroptera of Eastern North .\merica, pp. 1079-1080 (repeats Abbott's description and records). 1928. Arctocorixa modesta, Torre-Bueno, J. R. de la, in "A List of the In.sects of New York," p. 141 (Cornell Univ. Exp. Station Memoir 101). 1930. Arctocorixa modesta, Walley, G. S. Can. Ent., Vol. LXII, No. 12, p. 28 (Ontario, common in Ridcau and Ottawa rivers). (These were probably grossolineata n. sp.) 1932. Arctocorixa modesta, Ricker, Wm. E. Studies of Speckled Trout (Salvelinus fon- tinalis), Ontario, Pub. of Ontario Fisheries Research Lab. No. 44, in Univ. of Toronto Press Biol. Series No. 36, p. 88. 1932. Arctocorixa modesta, R'icker, Wm. E. Studies of Trout Producing Lakes and Ponds, pub. of Ontario Fisheries Research Lab. No. 45, in Univ. of Toronto Press Biol. Series No. 36, p. 132. Size: Length 4.6 mm. to 5.7 mm. Width across eyes 1.5 mm. to 1.9 mm. Color: General facies medium to dark brown. Pronotum crossed by 6 to 8 fairly regular dark bands, about equal in thickness to pale bands. Clavus with dark color frequently etched away on inner basal angles; cross-banded, with dark bands of central portion heavier than those of basal and distal portions; seen with naked eye, this gives the insect the appearance of having a dark spot on central portion of clavus. Corium irregularly cross-banded, the brown coloration tending to coalesce near inner distal angle into longitudinal stripe ; outer distal angle hyaline. Brown spot at distal end of cmbolar groove. Membrane separated from corium by a Western Hemisphere Corixidae 667 pale line; pattern mealy. Eniboliuni, head, limbs and thorax pale; abdominal venter black basally, pale distally in males; pale throughout in females. Structural characteristics: Head about two-thirds as long as pro- notal disk; interocular space less than width of an eye; male vertex slightly produ.ced as seen from above; face not hairy; male fovea oval, narrow, rather shallow; antennal segmentation: 1:2:3:4:: 20 : 13 : 33 : 23 males; 1 : 2 : 3 : 4 : : 19 : 16 : 34 : 25 females. Pro- notal disk rounded laterally and distally; median carina plainly visible on anterior third; pronotum and hemelytra moderately ras- trate, the latter practically without hairs ; pruinose area of embolar groove posterior to nodal furrow equal to that of claval suture. Lateral lobe of prothorax elongate, narrow, sides parallel, apex rounded; mesoepimeron inflated at base, nearly concealing the lat- eral lobe of the prothorax, broad distally with osteole about two- thirds of way to lateral bend; metaxyphus about as broad as long, apex pointed. Front leg of female of usual shape. Front leg of male: Pala a little more than twice as long as broad, about 35 pegs in a single row as in Plate XCIV, figs. 4, 13, 16 and 20; tibia two- thirds as long as pala, with long dorsal carina and a small pad; femur pilose on inner surface for half its length. Middle and hind legs slender; proportions as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 45.9 : 29.9 : 45.9. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 90.2 : 108.1 : 44.3. Dorsal surface of hind tibia with a row of short spines. Male asymmetry normally dextral; occasional examples of reversed asymmetry may be found; strigil minute, of 3 combs, located at end of a stalk on extreme right of sixth abdominal segment. For details of male structures see Plate XCIV. Female abdomen normal. Comparative notes: See key for distinguishing this form from the others. , Location of types: The type series, in part a gift from the collec- tion of Doctor Parshley and in part purchased from the Washington University collection, is now in the Francis Huntington Snow Col- lections, University of Kansas. Since the holotype, taken at Piney Branch, District of Columbia, is missing, a lectotype has been set up, bearing the label "Plummer's Island, Md., H. S. Barber, coll."; allotype female and 1 female paratype, Piney Branch, District of Columbia, July 5, 1905, D. H. demons; 1 male and 3 females. Great Falls, Md., Nov. 12, 1905, 0. Heidemann, coll.; 1 male and 4 fe- 668 The University Science Bulletin males, Plummer's Island, Md., March 23, 1!»07. D. H. demons; 1 fe- male. Church Bridge, Va., Aug. 30, 1906, D. H. demons. Data on distribution: (Plate XCVII. I Besides the types we have examined the following material: U. S. A.: Neiv Hampshire: Hampton, April 10, 1931. S. A. Shaw, 1 female; same place and collector, April 18, 1932, 1 female; same l^lace and collector. May 3, 1931, 2 females. Massachusetts: Uhler Coll., 1 female; Lynn, July, 1901. Davis (Parshley), 3 females; Maiden, June 1. 1895, F. H. Sprague, 1 male. Connecticut: New Haven, April 18, 1911, B. H. Waldcn, 3 fe- males; same place, Aug. 23, 1934, P. McKinstry, 2 males, 5 females; Litchfield, July 28, 1915, L. B. Woodruff, 2 males, 1 female; Suffield. May 12, 1903, F. Knabb, 1 female; Cheshire, May 6, 1911, B. H. Walden, 1 male; New Haven, Aug. 25, 1934, P. McKinstry, 1 fe- male. Neiv York: Lancaster, E. P. Van Duzee, 1 female; New Rochelle, Aug. 3, 1920, 1 male ; Ithaca, Aug., 1922, 1 male ; same place, Sept. 5, 1922 (Cornell), 1 female; same place, Aug. 30, 1922 (Cornell), 1 fe- male; same place, July 12, 1920 (Cornell), 1 male, 1 female; same place, July 11, 1917, H. B. Hungerford, 2 males, 4 females; same place, March 26, 1913 (Parshley), 1 male; same place, P. W. Claas- sen, 1 male, 2 females; same place, April, 1915, 1 female; Putnam Co., 1903 (Bueno Coll.), 5 males, 5 females; same place, Sept. 5, 1903, 1 male, 4 females; Buffalo, E. P. Van Duzee (Uhler Coll.), 1 male, 1 female; W. Shokan, July 30, 1909 (Am. :VIus. Nat. Hist.), 4 males, 4 females; Mosholu, April 24, 1906 (Wash. U. Coll.), 1 male, 2 females; White Plains, June, 1908 (Wash. U. Coll.), 2 fe- males; Nepperham, Sept., 1905 (Wash. U. Coll.) 1 male, 4 females; Van Cortlandt Park, April 18, 1903, 1 female; Batavia, July 8, 1913, H. H. Knight, 1 male, 1 female; Westport (Uhler Coll.), 1 female; New York, June 29, 1904 (Am. Mus. Nat. Hist.), 1 male. 1 female; Yaphank, Long Island, 1 female. Pennsylvania: Arendtsville, July 12, 1931, S. W. Frost, 1 male, 5 females; August (Uhler Coll.), 2 males, 5 females; Newtown, Stonybrook, May 16, 1925, L. B. Woodruff, 1 female; Rockville, April 1, 1919, J. G. Sanders, 1 male, 2 females; Highspire, Sept., 1925, 3 males, 3 females; Shawvillc, April 23, 1941, John Bauer (Carnegie), 2 males; Newton Square, July 1, 1941, J. C. Lutz (Lutz Coll.), 23 males, 28 females; Quakertown, Nov. 22, 1917, H. W. Fowler, 2 males; Overbrook (Phil. Acad. Sci.), 2 males; State College, Oct., Western Hemisphere Corixidae 669 1938, Singer, 1 female; same place, May 19, 1921, 1 female; same place. Nov. 21, 1938, S. W. Frost, 1 male; Lebanon Co., 2 mi. n. of Lebanon, Sept. 3, 1932, G. Kauffmaft (Mich.), 3 males, 4 females. Neio Jersey: Cranford, Aug. 6, 1904, 1 female; Milltown, July 1917, E. L. Dickerson, 1 male, 2 females; Cassville, May 13, 1910 (Am. i\Ius. Nat. Hist.). 2 females; Lakehurst, April 15, 1910 (Am. Mus. Nat. Hist.), 1 female; Camden Co., 1 male, 2 females; Micht- villc. S. T. Kemp, 3 males; Patterson, April 1923, 1 male. Maryland: Plummer's Island, July 27, 1913, W. L. McAtee (U. S. N. M.), 3 males, 6 females; Odenton, July 4, 1913, W. L. McAtee (U. S. N. M.), 2 males, 2 females; Plummer's Island, July 15, 1903, W. V. Warner, 1 female; Cabin John, Aug. 5, 1944, R. I. Sailer (U. S. N. M.), 31 males, 31 females; Beltsville, Sept. 25, 1932, P. W. Oman, 23 males, 44 females; Annapolis, summer, 1932, P. W. Oman, G males, 14 females; Glen Echo, 1892, O. Heidemann (Cornell), 2 males, 2 females; Myersville, May 23, 1911, 3 males; Maryland (Uhler Coll.), 3 males, 4 females. District of Columbia: Piney Brook, Sept. 26 (Uhler Coll.), 2 males. 4 females; Washington, Sept. 2, 1932, P. W. Oman, 12 males, 29 females; same place, May 7, 1905, D. H. Clemons, 2 males; same place (Cornell). 25 males, 56 females. West Virginia: Morgantown, Aug., 1923, 1 female; Parsons, July, 1924. 1 female; Turkey Co., July 26, 1928, 1 female; Preston Co., July 28, 1928, 1 male. Virginia: National Bridge. Aug. 22, 1918, A. N. Caudell, 4 fe- ■ males; Warrenton. May 15. 1923, L. C. Woodruff, 7 males. 6 females; Page Co., April 14, 1940, J. P. E. Morrison (U. S. N. M.), 3 males, 1 female; Bluemont, Aug. 31, 1913, W. L. McAtee (U. S. N. M.), 1 male; Paris, July, 1898 (Cornell), 3 males, 3 females; Springvale, 1897 (Uhler), 4 females; Virginia (111. Nat. Hist. Surv.), 1 female; Virginia (Cornell), 4 females. Tennessee: Clarksville, July 2, 1939, J. D. Beamer, 3 males, 2 females; Chattanooga, April 4, 1922, T. H. Hubbell (Mich. Coll.), 1 male; Cumberland Co., grassy cove, July 10, 1922, T. H. Hubbell (Mich.). 4 males. 8 females; Carter Co., Roan Mt., Aug. 11, 1925, T. H. Hubbell (Mich.). 1 female. Ohio: Rockbridge, 1916, C. J. Drake (Drake), 3 females; Hock- ing Co., 1916, C. J. Drake (Drake), 1 male, 2 females; Columbus, 1916, C. J. Drake (Drake), 4 males, 8 females; Portsmouth, Aug. 27, 1915, C. J. Drake (Drake), 1 female; Delaware, June 26, 1915, 670 The University Science Bulletin C. J. Drake (Drake), 3 females; Berea, July 17, 1914, L\ J. Drake (Drake), 1 female; Tiffin, July 16, 1916, C. J. Drake (Drake), 2 females. * Michigan: Druid Hill (Uhler Coll.), 1 male, 3 females; Huron Co., Pigeon River, July 3, 1922, R. F. Hussey (Mich.). 1 male, 2 females; Berrien Co., Sawyer Dunes, Aug. 31, 1919, R. F. Hussey (Hussey), 1 male; Washtenaw Co., June 17, 1919, same collector and collection, 4 males, 1 female; Ann Arbor, E. H. Forthingham (Mich.), 1 male, 1 female; Cheboygan Co., July 11, 1932, J. Leonard (Mich.), 1 male. Indiana: Indianapolis, 8 males, 6 females; Putnam Co.. Sept. 28, 1924, W. S. B. (Blatchley), 2 females. Illinois: Oakwood, July 1, 1932, W. V. B., 2 males, 2 females; Champaign, May 6, 1928, A. T. McClay, 1 male, 1 female; Havana, Illinois R. (111. Univ.), 4 males, 4 females; same place, Sept. 21, 1894, Hart and Newberry (111. Nat. Hist. Surv.), 2 females; Gor- ham, Aug. 8, 1932, W. J. Gerhard (Field Mus.), 1 male, 10 females; Muncie, July 24, 1909 (111. Nat. Hist. Surv.), 1 male, 2 females; Urbana, Oct. 28, 1907 (111. Nat. Hist. Surv.), 5 males, 2 females. Minnesota : H. B. Hungerford, 3 females. Missouri: St. Louis, June, 1911, J. F. Abbott (Abbott), 5 males; same place, May, L. Schoelch, 1 female; Columbus, April 6, 1946, W. S. Craig (Mo. Coll.), 1 male. Arkansas: Scott Co., Aug. 23, 1938, -R. H. Beamer, 1 male; Marion Co., July, J. C. Bridwell, 1 female. Mississippi: Agricultural College (Miss. Coll.), 4 males, 3 fe- males; luka, July 14, 1930, P. W. Oman, 1 male; Smithvillc, July 15, 1930, P. W. Oman, 1 male, 3 females. Louisiana: Slidell (Hussey Coll.), 1 female. Texas: Kerrville, April 12, 1907, F. C. Pratt, 6 males, 12 females; same place, Guinan Creek, July 2, 1938, Ira Norris (Mich.), 1 fe- male; Ketchum, Sept. 11, 1932, L. D. Tuthill, 1 female. Oklahoma: Comanche Co., National Forest, June H, 1926, T. H. Hubbell (Mich.), 4 females. Kansas: Douglas Co., 900 ft., F. H. Snow, 1 female; Kansas (Uhler Coll.), 1 female; Lawrence, July, 1935, L. S. Henderson, 1 female; Franklin Co., Nov. 15, 1924, H. K. Gloyd, 1 female; Riley Co., from student collection, 1 female; Cowley Co., Feb. 23, 1921, W. E. Hoffmann, 2 males, 8 females; same place, March 16, 1921, Western Hemisphere Corixidae 671 W. E. Hoffmann, 1 female; same place and collector, April 24, 1921, 2 males, 6 females. Nebraska: Lincoln, June 28, 1912, R. W. Dawson (Neb.), 3 males, 4 females; Pine Ridge, July (Neb.), 1 male; Lincoln, Oct. 1, 1898, Hart (111. Nat. Hist. Surv.), 1 male. Colorado: Fort Collins, Aug. 22, 1931, L. D. Anderson, 1 male, 3 females. Insular America: Porto Rico: Toa-Baja, 1915, G. Garb (Cor- nell ) . 1 male. Si gam (Vermicorixa) virginiensis n. sp. (Plate XCIV, figs. 9, 15, 24, and 26) Size: Length 4.2 mm. to -5.7 mm. Width of head 1.5 mm. to 1.8 mm. Color: General facies very like that of S. modesta (Abbott). Some tendency for pattern to be etched away at inner basal angle of clavus. Pronotum crossed by 7 to 8 rather narrow, irregular dark bands. Pattern of clavus and corium irregularly transverse. Head, limbs, and venter pale. Basal segments of male abdomen usually dark. Structural characteristics: Head about half the length of the pro- notal disk; vertex slightly produced in both sexes; interocular space narrower than the width of an eye; postocular space narrow; male fovea shallow and narrow, not attaining eyes laterally; antennae: 1 : 2 : 3 : 4 : : 18 : 20 : 35 : 25 (J ; 1 : 2 : 3 : 4 : : 20 : 20 : 38 : 25 $ . Pronotal disk of male usually somewhat reduced laterally, that of female normal; disk with lateral margins slightly rounded, at least not angulate; pronotum and hemelytra moderately ras- trate. Postnodal pruinose area shorter than that of the claval suture in both sexes. Lateral lobe of the prothorax elongate, sides nearly parallel, apex bluntly rounded. Mesoepimeron at level of the scent gland osteole broader than the lateral lobe of the pro- thorax and broader than the length of the last antennal segment; osteole nearer to the tip than to the lateral bend of the meso- epimeron. Metaxyphus broader than long, the apex blunt. Front leg of female of usual shape, the pala with about 20 lower palmar hairs. Front leg of male: pala with about 30 pegs in the peg row (for details see Plate XCIV, fig. 9) ; tibia about two-thirds as long as pala, with a slight dorsal carina and a nan-ow pad; femur slen- der, sides parallel, without a stridular area. Middle, and hind legs slender; hind femur with 4 to 6 spines on dorsal surface; propor- 672 The University Science Bulletin tions of segments as follows (average of 3 males and 3 females) : Middle leg: femur : tibia : tarsus : claw : : 100 : 45.2 : 27.3 : 42. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 86.6 : 119.8 : 46.6. Male asymmetry dextral; strigil moderately large, of five regular combs. For pictures of abdomen and genitalia see Plate XCIV, figs. 15, 24, and 26. Female abdomen normal. Comparative notes: This species closely resembles Sigara mo- desta (Abbott) in color pattern and in structural characteristics, but may be distinguished from the latter by having the meso- epimeron narrow with the osteole nearer its tip, and by having a large strigil in the male. Location of types: Holotype male, allotype female, and 57 male and 52 female paratypes labeled "New Church, Va., July 15, 1934, L. D. Anderson" in the Francis Huntington Snow Collections, Uni- versity of Kansas. Data on distribution: (Plate XCVH.) Besides the type series we have the following records: New Hampshire: Durham, Oct. 20, 1901, 1 male. Neic Jersey: College Farm, Aug., 1919 (Hussey), 1 male. Pennsylvania: Shawville, April 23, 1941, John Bauer (Carnegie), 2 males; Philadelphia, 1926, F. Anderson, 6 males, 5 females; same place. May 30, 1928, J. C. Lutz, 7 males, 1 female; same place and collector, May 7, 1928, 1 male, 1 female; Narberth, Dec. 19. 1922, Wm. E. Hoffmann (Phila. Acad. Sci.l, 1 male, 1 female. Ohio: Cuyahoga Co., July 16, 1914, C. J. Drake (Drake), 4 males, 4 females. Maryland: Annapolis, on U. S. 50, Sept. 18, 1932. P. W. Oman, 1 male. District of Columbia: Washington (Uhler), 1 female; Washing- ton (Cornell), 2 males, 5 females. Virginia: Warrenton, May 15, 1928, L. C. Woodruff, 1 male, 3 females. West Virginia: Aurora, Aug. 14, 1904, 0. Heidemann (Cornell), 1 female. North Carolina: Raleigh, Oct. 11, 1915, R. W. Leiby, 1 female; Swananoa, Oct. 5, 1915, same collector, 2 males, 6 females; Southern Pines, March 27, 1905, G. M. Bentley, 1 female; Valley of Black Mountains, Aug. 14, 1906, W. Beutenmuller, 1 male, 1 female; same place and collector, Sept. 15, 1906, 1 male, 1 female; Raleigh, Western Hemisphere Corixidae 673 early August, 1900, F. Sherman, 1 female; same place and collector, March 28, 1901, 1 female; same place and collector, Jan. 22, 1904, 1 male. South Carolina: (Uhler) 2 males. Georgia: Gainesville, April 2, 1911 (Cornell), 1 male, 1 female. Tennessee: Fentress Co., Allardt, Aug. 19, 1922, T. H. Hubbell (Mich.), 1 male. Texas: Wood Co., Feb. 5, 1939, D. Millspaugh, 1 male, 2 fe- males; Colorado Co., March 30, 1922, Mrs. Grace Wiley, 2 females; same place and collector, April 7, 1922, 1 female. Sigara (Verrnicorixa) uiashingtonensis n. sp. (Plate XCIII, figs. 6, 6a and 6b; Plate XCIV, fig. 25) Size: Length 4.7 mm. to 5.3 mm. Width across eyes 1.5 mm. to 1.7 mm. Color: General facies medium to dark brown. Pronotum crossed by 6 to 7 dark bands, broken and irregular, middle one or two ex- tending only across central portion of disk, some tendency for distal ones to coalesce at margins. Clavus obliquely cross-banded, dark figures irregular and forked at outer edges, some tendency for central ones to coalesce along median suture. Corium cross-banded, the dark figures somewhat forked and tending to coalesce into wavy longitudinal lines along embolar furrow and along inner apical angle of corium; dark spot at tip of embolar groove; outer apical angle of corium pale, uniting with pale line that separates corium from mem- brane; pattern of the latter reticulate, distal margins nearly black. Embolium pale distally, smoky at base; head and limbs pale; venter pale throughout in females, smoky at base of abdomen in males. Structural characteristics: Head as long as or, in a few cases, slightly longer than pronotal disk as seen from above; interocular space equal to the width of an eye; vertex somewhat produced in both sexes as seen from above; face not hairy; male fovea oval, shallow, narrow; antennal segmentation: 1 : 2 : 3 : 4 : : 18 : 10 : 35 : 20 males; 1 : 2 : 3 : 4 : : 20 : 10 : 35 : 20 females. Pronotal disk short compared to width, nearly twice as broad as long, some- what angulate laterally, and distally; pronotum and hemelytra coarsely rastrate, the latter with scattered pale hairs; pruinose area of embolar groove posterior to nodal furrow slightly longer than that of claval suture. Lateral lobe of prothorax elongate, slender, tip truncate; mesoepimeron moderately broad with osteole half way to 43—822 674 Thk University Science Billetin lateral beiul, margin very slightly notched at lateral bend; nietaxy- phus about as broad as long, tip blunt. Front leg of female of usual shape. Front leg of male as in Plate XCIII, fig. 6. Middle and hind legs slender; hind femur with two or three stout spines on dorsal surface; proportions of segments as follows (ave. 8 males, 8 fe- males) : Middle leg: femur : tibia : tarsus : claw :: 100 : 44.1 : 31.3 : 43.4. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 82.6 : 110.3 : 49.8. ]\Iale asymmetry dextral; strigil fairly large, of 5 regular combs. For details of male structures see Plate XCIII, figs. 6a and 6b. Female abdomen normal. Cotnparatirc notes: See key for separation of tiiis foi'm from the others. Location of types: Holotype male, allotype female, 10 male and 4 female paratypes labeled "Republic, Washington, Aug. 7, 1931, L. D. Andenson"; also 48 male and 47 female paratypes labeled ''Rochester, Wash., July 22, 1931, L. D. Anderson," in the Francis Huntington SnoAv Entomological Collections, University of Kansas. Data on diMribution: (Plate XCVII.) Besides the type series we iiave the following records: Canad.\: British Columbia: L. Windemere, Sept. 18, 1928, Owen Bryant (Bryant Coll.), 3 males, 3 females; Adams Lake, July 20, 1925, K. F. Auden. 10 males, 14 females; Vernon, Aug. 4, 1931, L. D. Anderson. 204 males, 300 females; same place, Oct. 4, 1921, W. Downes, 3 males, 6 females; W. Wold, Aug. 5, 1931, L. D. Anderson, 37 males, 50 females; Oliver, Aug. 6, 1931, L. D. Anderson, 18 males, 16 females; Queznel Lake, Sept. 29, 1933, W. Benedict, 5 males, 2 females; Vernon, Sept. 26, 1919, W. Downes, 1 male. Alberta: Crow's Nest Pass, June 27, 1930, J. H. Pepper, 2 males, ] female. U. S. A.: Washington: Yakima, July 8, 1935, E. I. Beamer, 9 males, 26 females; Cle Elum, Sept. 4, 1933, C. H. Martin, 1 male; Toppenish, July 9, 1935, R. H. Beamer, .8 males, 14 females; Mason Co., July 3, 1919, F. M. Gaige, 10 males, 42 females; Whitman Co., Nov. 27, 1926, D. J. Leffingwell, 1 female; same place, Palouse River, P. Putnam (Mich.), 5 males, 15. females; Auburn, White River, July 14, 1932, C. H. Martin, 40 males, 41 females; Naches, July 7, 1935, R. H. Beamer, Jr., 6 males, 8 females; Cle Elum, Sept. 4, 1933, C. H. Martin, 5 males, 20 females; Cliffdell, July 7, 1935, P. W. Oman (U. S. N. M.), 2 males, 5 females. Western Hemisphere Corixidae 675 Oregon: Union, July 18, 1931, L. D. Anderson, 38 males, 78 fe- males; Dixie, July 9, 1931, same collector, 45 males, 43 females; Portland, 1907, 2 females; Corvallis, 1 male; Harney Co., Trout Creek, July 26, 1934, C. L. Hubbs (Mich.), 1 male, 1 female; Lake Co., Warner Lake, July 30, 1934, same collector and collection, 1 fe- male; Lake Co., Cottonwood Cr., Aug. 8, 1934, same collector and collection, 1 female; Lake Co., Quartz Cr., Aug. 9, 1934, same collec- tor and collection, 1 female; Umatilla, July 14, 1931, M. W. San- derson, 12 male?;, 10 females; same place and date, L. D. Anderson, 2 males, 4 females; Hot Lake, July 13, 1931, same collector, 4 fe- males; North Powder, July 13, 1931, same collector, 20 males, 9 fe- males; Haines, July 10, 1931, M. W. Sanderson, 2 females; Yon- calla, July 12, 1935, R. H. Beamer, 2 males, 4 females. California: Walnut Creek, Aug. 9, 1929, R. L. Usinger, 2 males, 6 females; Weed, June 29, 1935, R. H. Beamer, 6 males, 14 females; (P. R. Uhler Coll.), 3 males, 1 female; St. Helena, July 1-15, 1908 (Cornell), 9 males, 38 females; Palo Alto, June 6, 1892 (Cornell), 1 female; San Jose, A. E. Burt (Cornell), 1 female; Victorville, August, 1915, C. H. Kennedy (Cornell), 2 females; Monticello, Putah Creek, Dec, 1917, J. C. Bradley (Cornell), 1 male; Napa Co. (Brooklyn Mus. Coll.), 2 males, 4 females; Salina River, same collection, 5 males, 5 females; Miles Canyon, Alameda Co., 1 male; Trinity Center, Trinity Co., Coffey Cr., June 26, 1931, R. L. Usinger (Usinger), 2 males. Nevada: Reno, July 12, 1939, P. Bartsch (Nat. Mus.), 2 males, 2 females; Del Monte R., Reno, July 12, 1939, P. Bartsch (U. S.- N. M.), 1 female. Arizona: Babociuivari Mts., July 16, 1932, R. H. Beamer, Jr., 1 female; Santa Cruz Co., June 9, 1940, M. F. Ashburn (U. S.- N. M.), 2 females. Utah: Heber, Aug. 17, 1940, L. C. Kuitert, 4 males, 22 females; Logan, April 8, 1930, G. F. Knowlton, 4 females (Utah Exp. Sta.) ; same place, collector and collection, March 21, 1929, 9 males, 18 fe- males; same place, collector and collection, Jan. 4. 1933, 1 male, 1 female; same place, Dec. 8, 1935, R. E. Nye, same collection, 1 male, 1 female; Logan Canyon, March 12, 1934, W. Thomas, 1 fe- male, same collection; Provo Canyon, Aug. 15, 1940, L. C. Kuitert, 21 males, 35 females; Benson Wood, April 8, 1930, G. F. Knowlton (Utah Exp. Sta.), 1 female; Fish Lake, Aug. 16, 1929, L. D. Ander- son, 2 males, 6 females; Weber Canyon, July 4, 1931, J. Nottingham, 1 female; Logan, Jan. 1, 1933, T. 0. Thatcher (Utah Exp. Sta.),' 676 The University Science Bulletin 1 male, 1 female; Logan Canyon, March 12, 1934, W. Thomas, same collection, 1 female; Logan, meadows, April 8, 1930, G. F. Knowlton, same collection, 1 female; Logan, Dec. 8, 1935, R. E. Nye, same collection, 1 male, 2 females; same place and collection, March 21, 1930, G. F. Knowlton, 1 female; same place and collection, June 3, 1935, R. E. Nye, 1 female; same place and collection, Aug. 13, 1934, F. H. Gunnell, 1 female; same place and collection, March 21, 1929, G. F. Knowlton, 9 males, 17 females; Brigham, Aug. 16, 1934, F. H. Gunnell, same collection, 4 males, 1 female. Idaho: BHss, July 7, 1931, L. D. Anderson, several hundred specimens; same place and date, M. W. Sanderson, 7 males, 7 fe- males. Montana: Whitehall, Aug. 13, 1931, L. D. Anderson, 6 males, 25 females; Drummond, Aug. 11, 1931, L. D. Anderson, 5 males, 6 females; Bennett, Aug. 12, 1931, same collector, 55 males, 45 fe- males; Glacier Nat. Park, Aug. 20, 1926, G. Cady, 4 males, 5 fe- males; same place, Sherborne Lake, April 13, 1932, A. S. Haggard, 1 male; Bozeman, May 15, 1927, 3 females; same place, Aug. 13, 1931, R. H. Beamer, 4 males, 13 females; Broadwater Co., L. Sewall, June 20, 1941, G. K. MacMillan (Carnegie), 1 male; Three Forks, July 22, 1931, L. D. Anderson, 1 male. Wyoming: N. Platte, 1925, G. Cady, 2 males, 5 females; same place and collector, Sept. 2, 1926, 2 males, 2 females; Yellowstone Nat'l Pk., Aug., 1891, S. A. Forbes (Illinois), 17 males, 27 females; Boulder, Aug. 19, 1931, L. D. Anderson, 1 female; Yellowston? Park, Lower Pelecan Potomogeton, Aug. 24, 1890, S. A. Forbes (Illinois Univ.), 4 females; same place, collector and collection. Head of Flathead Lake, Aug. 2, 1891, 13 males, 59 females. Colorado: Gould, Aug. 18, 1941, H. C. Severin, 1 female; North- gate, Aug. 20, 1931, L. D. Anderson, 2 males; Peyton, Aug. 19, 1936, R. H. Beamer, 1 female; Fruita, Aug. 15, 1936, M. B. Jackson, 1 fe- male. Sigura {V ermicorixa) grossolineata n. sp. (Plate XCIII, figs. 4, 4a and 4b; Plate XCIV, figs. 5, 6, 10, 11, 12) 1917. Arctocorisa scahra, Parshley, H. M. Occasional Papers of Boston Soc. Nat. Hist.,' VII, p. lin (in part, which see). Size: Length 4.7 mm. to 5.6 mm. Width across eyes 1.6 mm. to 1.9 mm. General shape longer and more slender than S. modesta (Abbott) . Color: General facies medium to dark brown. Pronotum crossed by 8 fairly regular brown bands, about as thick as pale interspaces, Western Hemisphere Corixidae 677 distal 3 or 4 tending to coalesce along margins, first 2 sometimes coalescent on either side of median carina which is generally pale. Color pattern of hemelytra, especially of clavus, variable, some- times almost solid, especially along hemelytral suture; at otlier times definitely cross-banded, but always with dark iiattern co- alescent along median suture. Corial pattern also varying from almost solid brown to definite pattern which has mottled appear- ance; dark coloration has some tendency to coalesce on inner distal angle of corium, but not so definitely as in S. modesta (Abbott) and >S. stigmatica (Fieb.) ; brown spot at apex of embolar groove; outer distal angle of corium pale. Corium separated by pale band from membrane which has reticulate pattern with distal margin solid brown. Embolium, head, and limbs pale; margins of thorax and distal portion of abdomen usually pale; postcoxal piece usually dark, base of abdomen dark. Structural characteristics: Head about half as long as pronotal disk; interocular space less than the width of an eye; vertex slightly produced and somewhat pointed in both sexes as seen from above; face not hairy; male fovea oval, narrow, fairly shallow; antennal segmentation: 1 : 2 : 3 : 4 : : 19 : 15 : 31 : 28 ^ ; 1 : 2 : 3 : 4 : : 20 : 15 : 35 : 25 5 . Pronotal disk longer in propor- tion to width than in S. modesta (Abbt.) or in S. stigmatica (Fieb.) ; angulate laterally, somewhat rounded distally; median carina plainly visible on anterior fourth ; pronotum and hemelytra coarsely rastrate, the latter with scattered pale hairs; pruinose area of em- bolar groove posterior to nodal furrow equal to that of claval su- ture. Lateral lobe of prothorax elongate, sides parallel, tip rounded; mesoepimeron broad with osteole almost at lateral bend; metaxyphus broader than long, apex bluntly rounded. Front leg of female of usual shape. Front leg of male: pala broader in in proportion to length than in *S. stigmatica (Fieb.), peg row con- sisting of 34 pegs; tibia about half as long as pala, with short, slight dorsal carina, and a small pad; femur slender, sides parallel, with pilose area on basal half of inner surface. Middle and hmd legs slender ; hind tibia with a row of short spines on dorsal surface ; proportions of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 43.3 : 27 : 48.9. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 86 : 104.5 : 45.2. Male asymmetry dextral; strigil minute, of 3 regular combs. Male pala, abdomen and genitalia as in Plate XCIII, figs. 4, 4a, and 4b. Female abdomen normal. 678 The University Science Bulletin Coynparative notea: This species is very close to >S. stigmatica (Fieb.) and S. modesta (Abbt.) but differs from the latter in tliat the scent gland osteole is located right at the lateral bend, and the metaxyphus is slightly broader than long. Location of types: Holotype male, allotype female, 17 male and 16 female paratypes labeled "Carlson, Minn., Aug. 8, 1922, H. B. Hungerford"; also 29 male and 27 female paratypes, same collector, Pelican Rapids, Minn., Aug. 22, 1922, in the Francis Huntington Snow Collections, University of Kansas. Data on distribution: (Plate XCVII.) Besides the types we have the following records: Canada: Canada, 1902, C. F. Baker, 4 females (U. S. N. M.), Montmor (Uhler Coll.), 1 male. Quebec: Laval, April 6, 1937, 1 male; same place. May 28, 1938, 1 female; Montreal Island, April 26, 1903 (Bueno), 2 males, 1 female. Ontario: Ottawa, April 16, 1927, G. S. Walley, 3 males; Thunder Bay Beach, July 9, 1941, H. S. Parish, 1 male; Toronto, March 21, 1931, E. C. Oakley, 1 male, 1 female. Manitoba: Hartney, July 31, 1937, H. T. Peters, 7 males, 10 females; same place and date, R. H. Beamer, 1 male, 3 females; Birch River, Aug. 3, 1937, C. L. Johnston. 1 male; Red Deer River, same date, R. H. Beamer, 16 males, 17 females; Mafeking, same date and collector, 1 male; same place and date, C. L. Johnston, 1 male; Swan River, Aug. 2, 1937, R. H. Beamer, 7 male, 11 females; Russell, Aug. 1, 1937, same collector, 3 males, 10 females; same place and date, H. T. Peters, 22 males, 30 females; Bird's Hill, June 5, 1911, J. B. Wallis (Wallis Coll.), 1 male; Swan River, Aug. 2, 1937, C. L. Johnston, 3 males, 10 females. Saskatchewan: Pelly, Aug. 2, 1937, C. L. .Johnston, 15 males, 11 females; same place and date, R. H. Beamer, 4 males, 4 females. U.S.A.: Maine: Orono, April 28, 1912 (H. M. P.), 1 female; Fryeburg, Aug. 20, 1934, M. E. Griffith, 11 males, 29 females. Neiv Hampshire: Durham, Oct. 20, 1901 (Parshley), 6 males, 14 females; Glen. Aug. 20, 1934, P. McKinstry, 2 females. Massachusetts: Forest Hills, May 4, 1921, R. F. Hussey, 1 male, 2 females; same place and collector, Oct. 21, 1921, 5 males, 4 females; Lynn, July, 1901, Davis Coll. (Parshley), 1 male. New. York: Ithaca, Aug. 8, 1903 (Parshley), 1 male; same place, June 11, 1917, H. B. Hungerford, 1 male, 1 female; same place Western Hemisphere Corixidae 679 (Cornell I, 1 female; Westport (Uhler Coll.), 1 female; Buffalo, E. P. Van Duzee (Uhler), 1 female. Pennsylvania: Delaware Co., July 1, 1941, J. C. Lutz (Lutz Coll.), 3 males, 4 females; Morris Park, Philadelphia, April 6, 1928. J. C. Lutz (Lutz Coll.), 1 male, 1 female; Narberth, Oct. 1!», 1922, W. E. Hoffmann, 1 male. Ohio: Summit Co., Aug. 31, 1916, C. J. Drake ( Drake Coll.) ; 1 male, 2 females. Michigan: Ann Arbor, July-Aug., 1921, R. F. Hussey iHussey), 3 males, 5 females; Agricultural College (Uhler Coll.), 1 male; Lake Gogebic, Aug. 18, 1937, C. L. Johnston, 1 male, 6 females; Bois Blanc Island, Aug. 11, 1932, H. B. Hungerford. 1 male, 3 fe- males; Douglas Lake, Aug, 25, 1925, same collector, 1 male; Che- boygan Co., Aug. 2, 1937, same collector, 5 males, 9 females; same place and collector, July 20, 1931, 2 males, 3 females; Livingston Co., Lakeland, Aug. 10, 1914, R. F. Hussey (Hussey), 1 male; Berrien Co., June 4, 1920, same collector and collection, 12 males, 24 females; Huron Co., Pigeon R,, July 3, 1922. R. F. Hussey (Mich.), 1 male. Illinois: (Uhler Coll.), 2 males; Normal (Uhler Coll.), 1 male; Algonquin. Nov. 3, 1908, Nason (111. Nat. Hist. Surv.), 1 male, 4 females; Edge Brook, Nov. 7, 1903, V. E. Shelford (Parshley). 2 females; Havana, Sept. 21, 1894, Hart and Newberry (111. Nat. Hist. Surv.). 2 males, 8 females; same place and collection. Aug. 15, 1894, Hart, 1 female; same place, collector and collection, April 11, 1895, 1 male, 1 female; same place, collector and collection, March 28. 1895, 1 male; same place, collector and collection, Dec. 23, 1895, 1 female; same place and collection, Nov. 14, 1895, Hempel and Kofoid. 1 male, 3 females; Homer, March 21, 1914, same col- lection, 1 female; Warsaw, June 26-27, 1893, same collection. 1 male, 2 females. Iowa: Ames, July 29, 1924, C. J. Drake, 1 male. 2 females; Iowa, April 3. 1940, D. Millspaugh, 1 male, 5 females; Iowa, April 9, 1940, J. G. Little, 5 males, 6 females; Iowa, Nov., 1931, D. Millspaugh, 1 female; Iowa, May 8, 1937, same collector, 4 female; Iowa, Oct. 25, 1936, same collector, 1 male; Iowa, May 23, 1935, H. Huisings, 1 male, 1 female; Iowa, March 17, 1939, 0. Halvorson. 1 female; Mt. Pleasant, April 3, 1940, Wirsig, 1 female; same i)lace, April 5, 1940, Dougherty, 1 female; same place, April 30, 1940, PhilUps, 1 female; same place, Oct. 19, 1936, M. E. Hoalzan. 1 female. 680 The Uxiversity Science Bulletin Wiilace and date, H. T. Peters, 1 male, 1 female; same place and date, R. H. Beamer, 2 males, 2 females; Hillsboro, July 26, 1937, same collector, 2 males, 2 females; Leonard, same date and collector, 2 males, 3 females; Fargo, July 26, 1937, H. T. Peters, 1 male. South Dakota: Rosebud, Sept. 15, 1940, H. C. Severin, 3 females; same jilace and collector, June 18, 1941, 2 males, 3 females; Hot Springs, June 22, 1940, same collector, 2 males; State Game Lodge, June, 1941, same collector, 1 male; Jordan, Sept. 5, 1940, same col- lector, 2 males; Rapid City, Sept. 7, 1940, same collector, 1 female; Redig, June 16, 1941, same collector, 2 females; Little White River, Sept. 14, 1940, same collector, 1 female; Piedmont, July 17, 1937, R. H. Beamer, 1 male; Houghton, July 22, 1937, same collector, 2 males, 1 female. Nebraska: (Uhler Coll.) 1 male; Lincoln, Oct. 1, 1898, Hart (111. Nat. Hist. Surv.), 1 male. Kansas: Riley Co., 1 female; Douglas Co., trap light, summer, 1930. P. B. Lawson, 1 male, 1 female; same place, H. B. Hunger- Western Hemisphere Corixidae 681 ford, 3 males, 2 females; same place, Rock Creek, same collector, 1 male; same place and collector, May 30, 1916, 1 male; same place and collector, Feb. 15, 1921, 1 male, 1 female; same place and col- lector, Feb. 23, 1921, 1 male, 1 female; same place, April 22, 1919, W. E. Hoffmann, 1 female; same place, July 29, 1919, same collector, 1 female; Medora, Sand Dunes, July 30, D. A. Wilbur, 1 female; Atchison Co., July 11, 1921, R. H. Beamer, 7 males, 11 females; Coldwater, June 19, 1927, H. B. Hungerford, 1 female; Decatur Co., 2,560 ft., F. X. Williams, 1 female; Hodgman Co., July 17-25, 1917, . 2 females; Leavenworth Co., July 12, 1924, E. P. Breakey, 30 males, 20 females; same place, July 1, 1924, R. H. Beamer, 1 female; Chase Co., June 20, 1923, C. 0. Bare, 1 female; Douglas Co., June 21, 1928, P. B. Lawson, 1 male, 4 females; same place, July, 1 male. ' Oklahoma: Ketchum, Sept. 11, 1932, L. D. Tuthill, 1 female; Tulsa Co., March, 1922, Mrs. Grace Wiley, 2 females; Oklahoma City, May 3, 1922, same collector, 1 male, 1 female. Neiv Mexico: Wagonmound, July 18, 1936, M. B. Jackson, 25 males, 27 females. Colorado: Ft. Collins, Aug. 6, 1899, 1 male; same place, Aug. 22, 1931, L. D. Anderson, 1 male, 3 females; Boulder, May 13, 1914, M. ]M. Ellis (Hussey), 1 male, 4 females. Wyoming: Wheatland, July 14, 1937, R. H. Beamer, 1 male, 3 females; Converse Co., July, 1904 (Carnegie Mus. Coll.), 1 male. Montana: Broadwater Co., L. Sewall, June 20, 1941, G. K. Mac- Millan (Carnegie) , 3 males, 5 females. Utah: Wellsville, Aug. 16, 1934, Gunnell (Utah Exp. Sta.), 2 males; Logan, Aug. 13, 1934, same collector and collection, 1 female; Spring Creek, R. E. Nye, same collector and collection, 1 male, 1 fe- male. Calif oniia: Mammoth Lakes, July 20, 1940, L. C. Kuitert, 8 males, 7 females. Sigara {V ermicorixa) mckinstryi n. sp. (Plate XCIII, figs. 1. la and lb) Size: Length 4.6 mm. to 5.8 mm. Width across eyes 1.5 mm to 1.8 mm. Color: General facies dark. Pronotum crossed by 6 irregular dark bands, a little narrower than pale interspaces, distal bands coalescent along lateral margins. Clavus cross-banded, the dark figures broader than pale ones, anterior ones forked, central and 682 The University Science Bulletin distal ones coalescent along median suture. Corium fros:«-banded, the dark figures dominant over pale ones, tending to coalesce into wavy, rather broad longitudinal lines along embolar groove and inner margin of corium; dark spot at apex of embolium; outer distal angle of corium pale, uniting with pale line which marks membranal suture. Pattern of membrane reticulate, distal margin dark brown. Embolium smoky at base, pale distally; in some specimens, pale tliroughout. Head and limbs pale; thoracic venter dark around coxae with sides pale; base of abdomen smoky in females to black in males, distal segments pale. Structural characteristics: Head half to two-thirds as long as pronotal disk; interocular space narrower than the width of an eye; vertex slightly produced in both sexes as seen from above; face not hairy; male fovea oval, narrow, shallow; antennal segmentation: 1 : 2 : 3 : 4 : : 18 : 12 : 33 : 25 J ; 1 : 2 : 3 : 4 : : 20 : 10 : 35 : 25 5 . Pronotal disk angulate laterally and apically, median carina on anterior fourth; pronotum and hemelytra coarsely rastrate, the latter with scattered pale hairs; pruinose area of embolar groove posterior to the nodal furrow longer than that of the claval suture. Lateral lobe of prothorax elongate, slender, tip obliciuely truncate; mesoepimeron narrow with osteole near the tip, broader than length of last antennal segment at level of osteole; metaxyphus a little broader than long, apex pointed. Front leg of female of usual shape. Front leg of male as in Plate XCIII, fig. 1. Middle and hind legs slender; proportions of segment to segment as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 42.5 : 30.3 : 42.5. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 84.7 : 107.8 : 45.4. Male asymmetry dextral; strigil small, of .4 regular combs. For details of male structures see Plate XCIII, figs, la and lb. Female abdomen normal. Comparative notes: See key for separating this species from others. Location of types: Holotype male, allotyjie female, 4 male and 24 female paratypes labeled "Contra Costa Co., Calif., April 5, 1936, P. McKinstry" in the Francis Huntington Snow Entomological Col- lection, University of Kansas. Data on distribution: (Plate XCVII.) California: Niles Canyon, Alameda Co., 7 males, 7 females; Stanford U., 6 males, 15 females; Sonona Co., 1 male; Lompoc, Aug. 9, 1938, D. W. Craik, 2 males; Madrone, Santa Cruz Co., Sept. 15, Western Hemisphere Corixidae 683 1922, G. D. Hanna (Van Duzee), 1 male, 1 female; Sonona, July 14, 1926, E. H. Nast (Van Duzee), 1 male, 1 female; St. Helena, July, J. C. Bradley (Van Duzee), 3 males, 5 females; San Mateo Co.. Moss Beach, Sept. 8, 1946 (Usinger), 1 male, 2 females. Sigara (Vcrmicorixa) jnathesoni n. sp. (Plate XCIII, figs. 3, 3a-3b) 1917. Arctocorisa stahra, Parshley, H. M. Occasional Papers of Boston Soc. Nat. Hist., ^■II. p. 119 (in part, which see). Size: Length 4.6 mm. to 5.3 mm. Width across eyes 1.6 mm. to 1.8 mm. Color: General facies a little darker than tiie medium. Head with a median longitudinal brown stripe; pronotum crossed by 6 irregular dark bands, a little narrower than pale spaces, and none of them coalescent along margins. Clavus obliquely banded, the dark coloration tending to coalesce medially along hemelytral su- ture. Corial pattern coarse, irregular, light and dark coloring about equal in distribution on outer portion, dark tending to coalesce into longitudinal brown stripe near inner distal angle; brown spot at apex of embolar groove; outer distal angle of corium semihyaline. Membrane and corium separated by pale line ; pattern of membrane reticulate. Embolium, head and .limbs pale; abdomen pale in fe- males, smoky at base in males. Structural characteristics: Head four-fifths as long as pronotal disk; interocular space equal to the width of an eye; vertex slightly produced in both sexes as seen from above; face not hairy; male fovea oval, narrow, rather shallow; antennal segmentation: 1:2: 3 : 4 : : 20 : 9 : 38 : 20 ^ ; 1 : 2 : 3 : 4 : : 20 : 10 : 38 : 21 $ . Pronotal disk rounded laterally, somewhat pointed distally; median carina plainly visible on anterior third; pronotum and hemelytra moderately rastrate, the latter with scattered pale hairs; pruinose area of embolar groove posterior to nodal furrow longer than that of claval suture. Lateral lobe of prothorax elongate, sides parallel, tip rounded; mesoepimeron moderately broad with osteole about two-thirds of way from tip, deep incision in mesoepimeron at lateral bend ; metaxyphus a little broader than long, tip pointed. Front leg of female of usual shape. Front leg of male: pala elongate, not quite three times as long as broad, 28 pegs in a single row as in Plate XCIII, fig, 3; tibia with dorsal carina and an oblong oval pad surrounded by hairs; femur slender with inner surface pilose on basal third. Middle and hind legs slender; proportions of seg- ments as follows: 684 The University Science Bulletin Middle leg: femur : tibia : tarsus : claw : : 100 : 44.4 : 81.3 : 46.3. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 92.8 : 128.5 : 53.6. Male asymmetry dextral; strigil large, suboval, of seven regular combs; tip of male right clasper hooked. For details of male structures see Plate XCIII, figs. 3, 3a, and 3b. Female abdomen normal. Com'parative notes: Although closely related to »S. stigmatica (Fieb.), this species may readily be distinguished from the latter in having the mesoepimeron notched, and in having the pruinose area of the claval suture shorter than that of the postnodal pru- inose area. Location of types: Holotyi^e male and allotype female, labeled "Truro, Nova Scotia, Can., Aug. 5, 1913, R. Matheson"; 1 male paratype labeled "Redberry L., Saskatchewan, Can., Sept. 21, 1940, via D. S. Rawson"; and 6 male and 3 female paratypes labeled ''Cheboygan, Mich., Aug. 18, 1931, H. B. Hungerford" in the Francis Huntington Snow Collections, University of Kansas. In the Cor- nell Collections, Ithaca, New York, 1 male and 5 female paratypes bearing same data as the holotype and allotype. Data on distribution: (Plate XCVII.) Besides the type series we have the following records: Canada: Manitoba: July 13, 1917, J. B. Wallis, 1 female (Wallis Coll.). U. S. A.: Connecticut: Cornwall, June 26, 1924, L. B. Woodruff (A. M. N. H.), 1 female. New York: Ithaca, June 11, 1917, H. B. Hungerford, 1 male; Cedar R., July 6, 1934, M. W. Sanderson, 2 males, 1 female. New Jersey: Jamesburgh, Hussey, 3 females; New Brunswick, Hussey, 1 female. Pennsylvania: Wyomissing, Aug. 27, 1934, R. P. Seibert, 2 males, 2 females; Bethlehem, May 14, 1912, H. W. Fowler, 1 female; State College, Nov. 21, 1938, S. W. Frost, 1 male, 3 females; same place, 1917, 3 males, 5 females; August (Uhler), 2 females. Michigan: Fond du Lac Co., Grand R., Fairwater, Aug. 28, 1925, Creaser and Jones (Mich.), 10 females; Au Sable R., Roscommon, Aug. 16, 1929, T. L. Hankinson (Mich.), 1 female. Wisconsin: Brule, Aug. 16, 1937, C. L. Johnston, 14 males, 13 fe- males; Dane Co., April 19, 1930, E. P. Breakey, 3 males, 2 females; Madison, 1 male, 3 females (male to Europe, 1928) ; Sauk Co., Western Hemisphere Corixidae 685 Baraboo R., Aug. 31, 1927, Greaser, Stewart and Griffith (Mich.), 1 female. Minnesota: Minneapolis, Mississippi River, May 4, 1920, R. F. Hussey (Hussey), 1 male. Sigara (Vermicorixa) vandykei n. sp. (Plate XCIII, figs. 5, 5a-5b) Size: Length 4.3 mm. to 4.6 mm. Width across eyes 1.5 mm. to 1.6 mm. General shape rather short and compact. Color: General facies medium brown. Pronotum crossed by 7 to 8 dark bands, equal in thickness to pale spaces, and tending to be broken, little tendency to merge on margins. Clavus boldly cross-barred, the dark and light coloration about eciually distributed, central dark bands tending to coalesce along median suture. Corial pattern transverse with dark coloration tending to coalesce into a wavy longitudinal line next to embolar groove; pruinose area be- yond nodal furrow bordered by black which extends almost to membranal suture; outer distal angle of corium and membranal suture pale; pattern of membrane reticulate, distal border dark. Embolium, head, limbs and venter of thorax pale ; abdominal venter dark at base in both sexes. Structural characteristics: Head half as long as pronotal disk; interocular space equal to the width of an eye; vertex slightly pro- duced in both sexes; face not hairy; male fovea narrow, oval, rather shallow; antennae: 1 : 2 : 3 : 4 : : 15 : 12 : 32 : 25 ^j^ ; 1 : 2 : 3 : 4 : : 15 : 12 : 35 : 25 $ . Pronotal disk with lateral angles acute, rounded distally, median carina visible on anterior fourth; pro- notum and hemelytra coarsely rastrate, the latter with scattered pale hairs; antero-lateral third of clavus ridged and projecting over the pruinose area of the claval suture ; pruinose area of basal angle of corium extending as far caudad as apical portion of that of the claval suture; pruinose area of the embolar groove posterior to the nodal furrow about equal to that of the claval suture. Lateral lobe of the prothorax elongate, apex rounded ; mesoepimeron narrow with osteole near tip, shallow notch in margin at lateral bend; metaepisternum with uneven surface; metaxyphus a little broader than long, apex pointed. Front leg of female of usual shape. Front leg of male: pala somewhat excavated below peg row, peg row of 30 pegs, 16 of which are double (8 pairs) as in fig. 5, Plate XCHI; upper palmar row of bristles interrupted distally with about 8 bristles set above rest of row; tibia about half as long as pala, with 686 The University Science Bulletin a short dorsal carina and a small pad; femur slender, with a patch of rather long hairs on inner surface. Middle and hind legs slender ; proportions of segments as follows (ave.) : Middle leg: femur : tibia : tarsus : claw :: 100 : 44.1 : 31.7 : 46.8; hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 88 : 108.3 : 45.8. Male asymmetry dextral; strigil small, of 4 regular combs. For details of male structures see Plate XCIII, figs. 5, 5a, and 5b. Female abdomen with median lobe of eighth ventral abdominal segment narrow and long, and with anal lobes iiropcn-tionately shortened. Comparative notes: This sj^ecies can be separated from other corixids in having the antero-lateral third of the claVus ridged and projecting over the pruinose area of the claval suture, and in having the surface of the metaepisternum uneven. Location of types: Holotype male and allotyj^e female labeled "Mouth of Van Duzen R., Calif., July 26, 1938; presented by E. C. Van Dyke" in the collection of the California Academy of Science. 1 male and 1 female paratype, bearing same data as above, and 7 males and 7 females paratypes labeled "Kalama River, AVash- ington, July 21, 1931, L. D. Anderson" in the Francis Huntington Snow Collections, Lawr^ce, Kansas. Data on distribution: (Plate XCVII.) Known only by the type series. SIgara iVermicorixa) solensis (Hungerford) (Plate XCV, figs. 3, 3a and .Ih) 1926. .lrf^of(»/ja solensis Hungerford, H. B. Bull. Brooklyn Ent. Sa and 5b; wash drawing No. 41, Plate VII) 19311. Arctoi-orixa miiani HiinsTprtdrd. H. B. Pan-Pac. Ent. \o\. VII, No. 1, p. 25, figs. 3 and 4. 1931. Sigam omuni, Jaczewski. T. Archiv. fi'ir H\drol)i(iIngie. Bd. XXIII, pp. 313-14, figs. 13-10. (Records from Washington.) Size: Length 5.1 nnu. tt) 6.7 mm. Width across eyes 1.8 mm. to 2.1 mm. Color: General facies medium brown. Pronotum crossed by 9 or 10 narrow, broken, irregular dark lines, the anterior ones not quite attaining the lateral margins. Clavus and corium with pale and dark lines in broken, transverse series. Corium and membrane separated by a pale line. Membranal pattern obscure and reticu- late. Embolium smoky; head and limbs pale. Venter of female pale, that of male usually dark. Structiirdl characteristics: Head about half as long as the pro- notal disk; interocular sj^ace equal to the width of an eye; vertex smoothly rounded in both sexes; face with a few long hairs; male fovea shallow, poorly defined; antennal segmentation: 1:2:3: 4 : : 20 : 15 : 40 : 25 ^^ ; 1 : 2 : 3 : 4 : : 20 : 18 : 40 : 28 $ . Pro- notal disk rounded laterally and apically, with median carina on an- 702 The University Science Bulletin terior third; pronotum and hemelytra heavily rastrate; pruinose area of embolar groove posterior to the nodal furrow equal in length to that of claval suture. Lateral lobe of prothorax elongate, sides parallel, tip truncate; mesoepimeron narrow with osteole near tip; metaxyphus triangular, as broad at base as long, apex pointed. Foreleg of female of usual shape. Foreleg of male: pala cultrate, broader apieally than basally, carinate on dorsum at base, with about 20 pegs in a single distally curving row; tibia about two- thirds as long as pala, with a short dorsal carina and no pad; femur moderately slender, with pilose area at base. Middle and hind legs slender; hind femur with 1 to 3 spines dorsally; segmental propor- tions of legs as follows : Middle leg: femur : tibia : tarsus : claw : : 100 : 45.9 : 32.8 : 41. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 88.2 : 117.6 : 44. Male asymmetry dextral; strigil of moderate size, oval, of 7 regular combs. For details of male structures see Plate XCVI, figs. 5, 5a and 5b. Female abdomen normal. Comparative notes: This species is most closely allied to 8. neva- densis (Walley), from which it may be distinguished by having the interocular space equal to the width of an eye as measured by pro- jection, by having the male pala broadest beyond the middle with no ridge across its face, and by having the pronotal disk with lat- eral margins rounded. Location of types: Described from thirty-four specimens from Carson City, Nevada, Aug. 9, 1929, R. H. Beamer. Holotype, allo- type and some paratypes in the Francis Huntington Snow Entomo- logical Collections, University of Kansas. Paratypes also in the U. S. National Museum and the California Academy of Science. Data on distribution: (Plate XCVIII. ) Canada: British Columbia: Prince Rujiert, Jan. 1, 1944, Norman Carter, 9 males, 17 females; Chilliwack, April 20, 1925, 1 male; Vancouver Island, Aug. 8, 1898, G. W. Taylor, 1 male, 2 females. U. S. A.: Washington: Kalama R., Aug. 22, 1923, C. H. Martin, 1 male; same place, July 21, 1931, L. D. Anderson, 1 male, 1 female; Puyallup, July 5, 1935, Jean Russell, 1 male; Kent, Aug. 22, 1933, C. H. Martin, 1 male; Cliffdell, July 7, 1935, Jack Beamer, 1 fe- male; Arlington, July 23, 1931, L. D. Anderson, 3 males, 2 females; Mason Co., L. Cushman, 1919, P. Putnam, 27 males, 38 females (Mich. Coll.) ; Whitman Co., Palouse R., Oct. 24, 1919, P. Putnam. 1 female (Mich. Coll.); (Cornell), 1893, 1 male, 4 females. Western Hemisphere Corixidae 703 Oregon: Waldport, July 11, 1935, R. H. Beamer, 26 males, 46 fe- males; Florence, July 11, 1935, Jack Beamer, 16 males, 18 females; Hood R., July 17, 1931, L. D. Anderson, 19 males, 30 females; Hot Lake, July 13, 1931, same collector, 1 female; N. Powder, same date and collector, 7 males, 9 females; Corvallis, May 1, 1936, Virgil Starr, 1 male; same place, July 5, 1929, J. E. Davis, 2 males, 1 fe- male; Modoc Point, July 1, 1935, R. H. Beamer, 1 male, 3 females; same place and date. Jack Beamer, 1 male; Yoncalla, July 12, 1935, R. H. Beamer, 3 males, 5 females; Corvallis, Aug. 8, 1925 (Brook- lyn Mus. Coll.), 2 males, 6 females; so. of Worden, Jul}' 1, 1935, P. W. Oman (U. S. N. M.) , 1 female. California: S. L. Obispo Co., June 1, 1916, C. L. Hubbs (Field Mus.), 1 male; Lake Tahoe, Aug. 11, 1940, L. C. Kuitert, 62 males, 54 females; Berkeley, Oct. 23, 1927, Jean Linsdale, 5 males, 8 fe- males; same place and collector, April 26, 1933, 1 female; Secjuoia Nat. Park, July 15, 1907, J. C. Bradley (Kirk Coll.), 2 females; Three Rivers, July 12, 1907 (Cornell Coll.), 1 female; Red Bluff, June 27, 1935, Jack Beamer, 1 female; same place and date, Jean Russell, 2 females; Weed, June 29, 1935, Jean Russell, 1 male; same place and date, R. H. Beamer, 2 males, 2 females; Mono Lake, May 12, 1917, C. L. Fox, 4 males, 4 females; Eagle Lake, Lassen Co., July 31, 1921, J. 0. Martin, 1 male; Mammoth Lake, July 29, 1940, L. C. Kuitert, 1 male; Viola, May 21, 1941, C. Michener, 2 males, 4 females; Lone Pine, July 28, 1940, L. C. Kuitert, 9 males, 14 fe- males; Tuoleme Meadows, Aug. 1, 1940, same collector, 1 male, 2 females; Sequoia Nat. Pk., Aug. 6, 1940, same collector, 9 males, 12 females; Stanford U. (purch. from Wash. U. Coll.), 1 male, 1 fe- male; (Uhler Coll.), 2 males; Phillips Station, Eldorado Co., July 24, 1921, F. E. Blaisdell, 7,000 ft. elev., 1 male, 1 female (Van Duzee) ; Modoc Co., Surprise Valley, Aug. 6, 1934, C. L. Hubbs (Mich.), 1 male. Nevada: Carson City, Aug. 9, 1929, R. H. Beamer, 9 males, 18 females; same place and date, P. W. Oman, 1 male, 1 female; Reno, Oct., 1939, La Rivers, 1 male, 2 females. Arizona: (Uhler Coll.), 1 male. Idaho: Moscow, 2 males. Wyoming: Yellowstone Park, Aug. 15, 1931, L. D. Anderson, 4 males, 6 females; same place, Shoshone Basin, C. T. Brues, 1 male. 704 The University Science Bulletin Sigara {Vermicorixa) nevadensis (Walley) (Plate XCVI, figs. C. 6a and 6b) 193C. Arctocorixa nevadensis Walley, G. S. Can. Ent. LXVIII, pp. 58-09, PI. II, (igs. 1-4 (Humboldt River, Nevada). Size: Length 5.3 mm. to 6.6 mm. AVidth across eyes 1.7 mm. to 1.9 mm. Color: General facies pale to medium brown. Pronotum crossed by 6 or 8 narrow brown lines, none of them attaining the lateral margins, posterior ones broken and irregular. Clavus with dark lines in transverse series, usually etched away on inner basal angles. Corium with dark pattern transverse, but more irregular and tend- ing to coalesce along margins. Membrane separated from corium by a pale line; pattern reticulate. Embolium, liead, limbs and venter pale. Structural characteristics: Head half as long as pronotal disk, with median carina on distal margin; vertex slightly produced in both sexes as seen from above ; interocular space equal to or slightly greater than the width of an eye; face with a few hairs; male fovea poorly defined, narrow and shallow; antennal segmentation: 1:2: 3 : 4 : : 22 : 17 : 40 : 23 J ; 1 : 2 : 3 : 4 : : 23 : 17 : 43 : 25 $ . Pro- notal disk acutely angulate laterally, rounded distally; median carina barely visible on anterior third; pronotum and hemelytra finely rastrate, the latter with scattered pale hairs; pruinose area of embolar groove posterior to nodal furrow equal in length to that of claval suture; embolium rather broader, compared to width of a hemelytron, than is usually the case. Lateral lobe of the pro- thorax elongate, a little broader at base than across tip which is truncate; mesoepimeron narrow with osteole near tip; metaxyphus about as long as broad, blunt distally. Foreleg of female of usual shape. Foreleg of male: Pala not carinate on outside, broadest across basal portion, with an oblique ridge across inner surface at about the middle, about 32 pegs arranged as in Plate XCVI, fig. 6a; tibia short, about half as long as pala, with a pronounced dorsal carina; femur slender with a basal pilose area. Middle and hind legs slender; hind femur with 4 to 6 spines on dorsal surface; i^ro- portions as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 48.2 : 29.2 : 43. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 87.9 : 106.1 : 51.5. Male asymmetry dextral; strigil of moderate size, with 7 irregular combs. For details of. male structures see Plate XCVI, figs. 6, 6a and 6b. Female abdomen normal. Western Hemisphere Corixidae 705 Comparative notes: Though closely related to S. omani (Hungfd.) , this species may be distinguished from it by having the lateral margin of the pronotal disk acute and by having an oblique ridge across the face of the male pala. Location of types: Holotype male, allotype female, and some paratypes labeled "Humboldt River, Nevada (S. Garman)" in the Museum of Comparative Zoology, Cambridge, Mass. Some para- types, No. 4045, in Canadian National Collection, Ottawa, Canada. Two paratypes, male and female, in the Francis Huntington Snow Entomological Collections, University of Kansas. Dtat on distribution: (Plate XCVHI.) Nevada: Humboldt R., August, Garman (via Walley), 1 male, 1 female (paratypes). Utah: Lehi, June, 1930, G. F. Knowlton (Utah Exp. Sta.), 1 male; Weber Canyon, July 4, 1931, J. Nottingham, 1 male; Far West, April 12, 1924, C. J. D. Brown, 1 male; Tremonton, July 5, 1931, L. D. Anderson, 22 males, 11 females; Hooper, at hght, July 21, 1940, Knowlton and Dorst, 12 males, 2 females. Wyoming: Sweetwater Co., Green R., Sept. 16, 1934, C. L. Hubbs (Mich.), 1 male. Sigara (Vermicorixa) pectenata (Abbott) (Text fig. IG) 191.".. Arcfocori.-'n pecfenafa Abbott, .T. F. Bull. Brooklyn Ent. Soc, Vol. VIII. i>. 8.3, text fig. of pala. ]!1'7. Arctncoiixa pcctiiiata. Van Duzee. E. P. Catalogue of the Heiniptera .... p. 483. M)''!\. Antocoiixa pecteiuita. Blatchley, W. S. Heteroptera of Eastern North America, p. 1080. 19'^8. Arctuciirixa pertermfa. Torre-Buenn, ,T. R. de la, in "A List of the Insects of New York," p. 141 (Cornell Univ. Agri. Exp. Sta. Memoir 101). 19S8. Arctororixa peciinata, Briniley, C. S. Insects of North Carolina, p. 84. 1939. Arctororixa pectenata, Millspaugh, Dick D. Field and Laboratory, Vol. VII, No. 2, p. 85. Size: Length 4.4 mm. to 5 mm. Width of head across eyes 1.5 mm. to 1.7 mm. General shape rather short and compact. Color: General facies rather dark. Pronotum crossed by 7 or 8 narrow, regular brown bands. Clavus crossbanded with narrow, irregular brown bands, almost effaced on inner basal angle. Corial pattern of short, irregular brown markings arranged in more or less transverse series. Membrane plainly separated from corium by pale line. Embolium smoky to black; head and limbs pale, venter pale to smoky. 45—822 706 The University Science Bulletin Structural characteristics: Head about half as long as pronotal disk, interocular space less than width of an eye; vertex not pro- duced beyond eye margins as seen from above, facial hairs few, male fovea shallow, narrow, poorly defined; antennal segmenta- tion: 1 : 2 :*3 : 4 : : 18 : 15 : 28 : 25 c? ; 1 : 2 : 3 : 4 : : 18 : 14 : 30 : 28 5 . Pronotal disk slightly reduced — at least, not extend- ing as far laterad as outer basal angle of clavus, median carina visible on anterior fourth; disk roundly pointed apically; pronotum and hemelytra finely rastrate. Pruinose area of the embolar groove posterior to the nodal furrow equal in length to the pruinose area of the claval suture. Lateral lobe of prothorax elongate, its an- terior distal angle produced; mesoepimeron about as wide as thor- acic lobe, osteole about one-third of way from tip to lateral bend; metaxyphus broader than long, tip rounded. Front leg of female of usual shape. Front leg of male: pala with dorsal ridge or hump about midway of length; this ridge extends down across surface of pala ; peg row consisting of 24 or 25 pegs which almost overlap the upper palmar row of bristles; tibia slender, about half as long as pala, with slight dorsal carina and no pad; femur rather stout, sides tapering from broad base toward tibial joint; pilose area on inner surface. Middle and hind legs slender; comparative measure- ments of segments as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 40 : 30 : 40. Hind leg: femur : tibia : tarsus 1 : tarsus :: 100 : 79.9 : 100 : 43.3. Male asymmetry dextral; strigil small, suboval, of 5 regular combs, and lying almost at lateral margin of sixth abdominal seg- ment. Median lobe of seventh abdominal segment broadly triangu- lar. For details of male pala, abdomen, and genitalia see text fig. 16. Female abdomen normal. Comparative notes: This is not a striking species in any way ex- cept for the shape of the male pala. Location of types: Holotype male, allotype female, Marietta, Ga., March 5, 1911, in the Cornell Collection, Ithaca, N. Y. Data on distribution: (Plate XCIX.) U. S. A.: New Jersey: Lakehurst, May 30, 1903, 1 male. Maryland: Odenton, July 4, 1913, W. L. McAfee, 4 males, 4 fe- males (U. S. N. M.) ; Plummer's Island, April 27, 1913, W. L. Mc- Atee, 1 female (U. S. N. M.). Washington, D. C: Sept. 19, 1890 (0. Heidemann, Cornell U.), 1 male, 1 female. Western Hemisphere Corixidan 707 Virginia: Bluemont, Aug. 31, 1913, W. L. McAtee (U. S. N.M.), 4 females; Vienna, July 17, 1913 (Barber Coll.), 1 male; Warren- ton, June 7, 1928, L. C. Woodruff, 1 male. North Carolina: Raleigh, Dec. 28, 1904, C. S. Brimley (Brimley Coll.), 3 males, 7 females. Georgia: Stone Mt., Aug. 3, 1912, 4 males, 6 females; Wrens, Aug. 22, 1930, P. W. Oman, 2 males, 2 females. Alabama: St. Meigs, July 21, 1930, R. H. Beamer, 1 male, 1 fe- male; (Kirkaldy Coll.), 1 male; (C. F. Barber in U. S. N. M.), 8 males. Tennessee: Coal Creek, Aug. 27, 1930, P. W. Oman, 1 male. Mississippi: Lauderdale, July 17, 1930, P. W. Oman, 15 males, 17 females; same place and date, R. H. Beamer, 12 males, 8 females; same place and date, L. D. Tuthill, 5 males, 4 females; Columbus, July 16, 1930, R. H. Beamer, 2 males; Beaumont, April 19, 1932, H. Dietrich, 1 male, 1 female. Indiana: Tippecanoe Co., May 5, 1934, H. E. Brown (Mo. Col.), 1 female. Missouri: Fulton, Nov. 7, 1940 (pond) (Mo. Coll.), 1 male; El- don, Oct. 23, 1940 (Mo. Coll.), 1 male. Fig. 16. Sigara (Vermicorixa) pectenata (Abbott); (a) front leg of male; (b) genital capsule of male; (c) right clasper of male; (d) dorsal view of male abdomen. 708 The University Science Bulletin Oklahoma: Tulsa Co., March 21, 1922, G. C. Wiley, 20 males, 50 females; same place and collector, March 16, 1922, 1 male. Texas: Wood Co., Feb. 26, 1939, D. 0. Millspaugh, 1 male. Sigara (Vermicorixa) cubiensis n. sp. (Plate XCVI, figs. 3, 3a and 3b) Size: Length 5.5 mm. Width across eyes 1.6 mm. Color: General facies pale. Prcnotum crossed by 6 or 7 narj'ovv brown bands, somewhat broken on distal portion. Basal inner angle of clavus pale; elsewhere, pattern is arranged in faintly longi- tudinal series, but is very indistinct. Membrane semihyaline. Eni- bolium, head, limbs and venter pale. Structural characteristics : Head three- fourths as long as the pro- notal disk; interocular space about equal to the width of an eye; vertex of male rounded, not produced; fovea shallow, barely dis- cernible; antennal segmentation: 1 : 2 : 3 : 4 : : 22 : 12 : 30 : 18 ^ . Pronotum finely rastrate, without a median carina, rounded laterally and distally; hemelytra, including membrane, finely pitted; hemelytra covered with fine hairs. Pruinose area of the embolar groove posterior to the nodal furrow equal in length to that of the claval suture. Lateral lobe of the prothorax slender with posterior distal angle rounded and anterior one anteriorly produced. Meso- epimeron narrow with osteole near the tip; metaxyphus about as broad as long. Front leg of male: pala slender with about 24 pegs in peg row, of which the distal 7 or 8 are elongate; tibia slender with a rounded pad at distal end; femur slender with a stridular area of 8 or 9 rows of pegs on inner basal surface. Middle and hind legs slender, with a short row of short spines on dorsal surface of the hind femur; comparative measurements of segments: Middle leg: femur : tibia : tarsus : claw : : 100 : 44.2 : 28.8 : 44.2. Hind leg: femur : tibia : tarsus 1: tarsus 2 :: 100 : 92.8 : 121.4 : 46.4. Male asymmetry dextral, strigil small, of 3 combs. Right lobe of seventh abdominal segment angularly produced. For details of male structures see Plate XCVI, figs. 3, 3a and 3b. Comparative notes: This species is nearest in structure to S. quebecensis (Walley), from which it differs in having the male pala broadest across the basal third and in having the right lobe of the seventh abdominal segment with a lateral projection. In addition it lacks a strigilar area on the front femur. Western Hemisphere Corixidan 709 Location of types: Holotype male, allotype female, and 2 male paratypes labeled "Camaguey, Cuba, Aug. 10, 1924, J. Acuna" in the Francis Huntington Snow Entomological Collections, University of Kansas. In the U. S. National Museum are 2 male paratypes labeled as follows: "Cuba, P. R. Uhler Coll." and " Aguadilla, Porto Rico, Jan., 1899, August Busck." Data on distribution: Known only by the type series. (See Plate xcvni.) Sigara iVermlcorixa) scabra (Abbott) (Texl fifHire IT: wiish drawing No. 22, Plate \) 1913. Arctocorisa .-:rahia Al)h')tt, .1. F. Bull. Brooklyn Ent. Soc, VIII, pp. 83, 88 and !>(). (From Georgia and diaracterized in his keys on pp. 88 and 90.) 1915. Arctocorina srahra Abbott, J. F. Wa.shington Univ. Studies (St. Louis, Mo.), pp. 83-84, PI. XV, fig. 5. (Description 2 male types, Billy's Isl., Okefenokee Swamp, Ga.) 1917. Arc.ocorixa tscabra. Van Duzee, E. P. Catalogue of Hemiptera, p. 483. 1917. Arctocorisa scabra, Parsh'ey, H. M. Occasional Papers of the Boston Soc. of Nat. Hist., VII, p. 119. (Det. by .\bV)ott but all wrong.) (Orono, Me. = grossoUneata; Durham, N. H. ^ grossoUneata and siynata ; Linn, Mass. =; grossoUneata ; Providence, R. I. ^ sig- nata; Cheshire, Conn. ^ signata; New Haven, Conn. =z mathesoni.) 1922. Arc^ocoriia scnhara, Drake, Carl J. Tech. Pub. No. 16 of N. Y. State College of Forestry at Syracuse Univ., p. 80. (Wrong determination. Some other species. Not now in Drake c(jnection.) 1923. Arctocorisa scabra, Abbott, .1. P., in Ciuide tu Insects of Conn., Pt. IV, The He- miptera or Sucking Insects of Conn., p. 390, fig. 36 (17). (Wrong det. See note under Parshley above.) 1926. Arctocorixa scabra. Blatchley, W. S. Heteroptera of Eastern North America, p. 1080, PI. XII, fig. 17 (same errors as above). 1928. Arctocorixa scabia, Torre-Bueno, J. R. de la, in List of Insects of New York, p. 141, Cornell Univ. Agri. Exp. Sta. Memoir 101. (Bean Pond, Cranberry Lake.) (Based on Drake's 1922 record. Wrong det.) 1938. Arctocorixa scabra. Briiiiley. C. S. Insects of N. Carolina, p. 84. Size: Length 4 mm. to 5 mm. Width across eyes 1.3 mm. to 1.7 mm. Color: General facies medium brown. Pronotum crossed by 8 dark bands, a little thinner than pale spaces, and for the most part unbroken; some tendency for the distal 4 or 5 to coalesce along lateral edges of disk. Clavus cross-banded, the bands somewhat irregular in shape. Corial pattern somewhat confused, often ob- scure in males; dark lineations tending to coalesce near inner distal angle; outer distal angle of corium and margin beyond embolar groove semihyaline; corium separated by pale line from membrane which has obscure, in some cases almost nonexistent, pattern. Embolium reddish brown ; head and limbs pale ; venter pale to smoky in males. Structural characteristics: Head about two-thirds as long as pronotal disk; interocular space less than the width of an eye; 710 The University Science Bulletin inner margins of eyes almost parallel, especially in males; vertex of male not produced as seen from above; face not hairy; male fovea oval, narrow, rather shallow; antennal segmentation: 1 : 2 : 3 : 4 :: 18 : 15 : 32 : 28 2 ; 1 : 2 : 3 : 4 :: 18 : 12 : 30 : 28 J . Pronotal disk reduced, lateral and distal margins rounded, giving disk a heart-shaped appearance; median carina on anterior fourth ; pronotum and hemelytra finely rastrate, the latter with scat- tered pale hairs; pruinose area of embolar groove posterior to nodal furrow shorter than that of claval suture. Lateral lobe of pro- thorax slender, elongate, tip rounded; raesoepimeron narrow with osteole near tip; metaxyphus plainly broader than long, apex blunt.- Front leg of female of usual shape except pala depressed on dorsal margin near apex. Front leg of male as in text figure 17. Middle and hind legs slender, hind femur with 2 or 3 stout spines on dorsal surface; proportions of segments as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 44.4 : 32.5 : 44.3. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 84.4 : 107.1 : 45.1. Male asymmetry dextral; strigil small, oval, of 4 regular combs ; median lobe of seventh segment triangular. For de- tails of male structures see text figure 17. Coryijparative notes: This little species runs out in our key with »S. (P.) ynacropala Hunger ford but has a reduced pronotal disk that is heart-shaped, its lateral margins thickened. Location of types: Although Abbott, 1915, says "Types, two males from Billy's Island, June," I find 3 males, labeled "Billy's Island, Okefenokee Swamp, June 1912" and "cotype" in the Cornell collection, Ithaca, N. Y. One of these we are labeling "lectotype" and 1 male cotype we are placing in the Francis Huntington Snow Collections, University of Kansas. Data on distribution: (Plate CIV). Mississippi: Green Springs, Aug. 2, 1921, C. J. Drake (Drake), 1 female. Alabama: (Baker Coll. in U. S. N. M.), 1 male. Georgia: Okefenokee Swamp, Billy's Island, June 1912, 3 males; Wrens, Aug. 22, 1930, P. W. Oman, 5 males, 4 females. North Carolina: Raleigh, Jan. 4, 1922, F. Sherman, 1 male; Clemson College, March 25, 1930, J. G. Watts, 1 male. Western Hemisphere Corixidan 711 scobro (Abbt) Fig 17 Sigara {Vermicorixa) scabra (Abbott); (a) front leg of male; (b) genital capsule of male : (c) dorsal view of male abdomen. 712 The University Science Bulletin Sigara {Vermicorixa) gordita (Abbott) (Plate C, fig. 1, la and lb) 1913. Corixa gordita Abbott, J. F. Bull. Brooklyn Ent. Soc, Vol. VIII, pp; 84-85, Plate figs. 2, 2a (Cave Springs, Blackshear and Marietta, Ga.). Only Cave Springs material fit this species. 1917. Arcioeoriia gordita. Van Duzee, E. P. Catalogue of the Heniiptera of Anieiica North of Mexico, p. 486. 1926. Arciocorixa gordita, Blatchley, W. S. Heteroptera of Eastern North America, p. 1079, fig. 215, k (Georgia). 1938. Arciocorixa gordita, Briniley, C. S. Insects of North Carolina, p. 84. Size: Length 4 mm. to 4.5 mm. Width of head across eyes 1.3 mm. to 1.5 mm. Small and rather compact in shape. Color: General facies dark. Pronotum crossed by 6 or 7 fairly regular brown bands, equal in width to pale interspaces. Clavus cross-banded at base and apex, pattern tending to coalesce on central portion. Corial pattern in somewhat longitudinal series, tending to coalesce across wing from inner apical angle of corium to apex of embolar groove. Membrane separated from corium by ])ale line. Membranal pattern reticulate with plain brown border apically. Embolium, head, and limbs pale; venter smoky. Structural characteristics: Head about as long as pronotal disk; interocular space less than width of an eye; vertex of male not pro- duced beyond eye margins as seen from above; facial hairs few; male fovea scarcely discernible; antennal measurements: 1:2:3: 4 : : 19 : 15 : 35 : 25 ^J ; 1 : 2 : 3 : 4 : : 20 : 15 : 35 : 25 ? . Pro- notal disk with indication of median carina on anterior third; an- teriorly this may be prominent and jiale; rounded apically; prono- tum and hemelytra finely rastrate, the latter with a few pale hairs. Pruinose area of embolar groove posterior to nodal furrow equal in length to pruinose area of claval suture. Lateral lobe of prothorax about half as broad at base as long, tip rounded; mesoepimeron broad, osteole about half way between tip and lateral emargination. Metaxyphus about as broad as long. Front leg of female with pala not depressed dorsally nfear apex but space above upper palmar row of hairs narrow. Front leg of male: pala long and narrow, apex bluntly curved ; about 23 pegs in an almost straight row ; tibia about half as long as pala, with short dorsal carina and a shallow depres- sion on distal margin bearing a tlift of hairs; femur slender, with pilose area on inner surface. Middle and hind legs slender; hind femur with 3 or 4 short spines on dorsal surface near apical margin ; comparative measurements as follows: Western Hemisphere Corixidan 713 Middle leg: femur : tibia : tarsus : claw : : 100 : 44.7 : 32 : 49. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 82.1 : 107.1 : 50. Male asymmetry dextral, strigil small, oval, of 3 regular combs. For details of male structures see Plate C, fig. 1, la and lb. Comparative notes: In the original description Abbott indicates that the male is sinistral, yet the holotype is dextral. Evidently he thought the species belonged to what is now Trichocorixa. In his key to males he runs this species out with Corixa but in his key to females gives it as Arctocorisa gordita. Location of types: The Cornell Collection, Ithaca, N. Y., has holotype male, allotype female and 2 female paratypes from Cave Springs, Ga., Aug. 20, 1909, and I have found 2 males, 6 females that should have been labeled paratypes. They were taken at the same time and place. Abbott says "Others in the collection (paratypes) from Blackshear and Marietta, March." However, since he did not label his paratypes, I do not know what he had but there are no specimens from these places in the Cornell collection that belong to this species. Data on distribution: (Plate CIV.) Georgia: Cave Springs', Aug. 20, 1909 (Cornell Coll.), 2 males, 6 females. Massachusetts: Welleslev (Bost. Mus. Nat. Hist.), 1 male. 714 The University Science Bulletin PLATE XCIII Sigara Vermicorixa Walton Fig. 1. Sigara {Vermicorixa) mckinstryi n. sp.; front leg of male. Fig. la. Genital capsule of male. Fig. lb. Dorsal view of male abdomen. Fig. 2. Sigara {Vermicorixa) alternata (Say); front leg of male. Fig. 2a. Genital capsule of male. Fig. 2b. Dorsal view of male abdomen. Fig. 3. Sigara {Vermicorixa) mathesoni n. sp.; front leg of male. Fig. 3a. Genital capsule of male. Fig. 3b. Dorsal view of male abdomen. Fig. 4. Sigara {Vermicorixa) washing tonensis n. sp.; front leg of male. Fig. 4a. Genital capsule of male. Fig. 4b. Dorsal view of male abdomen. Fig. 5. Sigara {Vermicorixa) vandykei n. .sp.; front leg of male. Fig. 5a. Genital capsule of male. Fig. 5b. Dorsal view of male abdomen. Fig. 6. Sigara {Vermicorixa) grossolineata n. sp.; front leg of male. Fig. 6a. Genital capsule of male. Fig. 6b. Dorsal view of male abdomen. Western Hemisphere Corixidan 715 PLATE XCIII 716 The University Science Bulletin PLATE XCIV Sigara Vermicorixa Walton Fig. 1. Sigara {Vermicorixa) modesta (Abbott); right clasper, Putnam. N. Y. Fio. 2. Sigara (Vermicorixa) stigmaiica (Fieber)*; right clasper, Putnam, N. Y. Fig. 3. Sigara {Vermicorixa) grosnolincata n. sp.; right clasper, Ft. Collins, Colo. Fig. 4. Sigara (F.) modesta (Abbt.) ; pala of male, Mass. Fig. 5. -S. (V.) grossolineata n. sp.; male pala, Ames, Iowa. Fig. 6. S. {V.) grossolineata n. sp.; right cla.sper, Ottawa, Ont. Fig. 7. S. {V.) modesta (Abbt.) ; right clasper, Mass. Fig. 8. S. {V.) modesta (Abbt.); right clasper, Kerrville, Tex. Fig. 9. S. {V.) virginiensis n. sp.; male pala, Philadelphia, Pa. Fig. 10. S. {V.) grossolineata n. sp.; male pala, Ottawa, Ont. Fig. 11. S. (V .) grossolineata n. sp.; male pala, Ft. Collins, Colo. Fig. 12. S. {V.) grossolineata n. sp.; right clasper, Ames, Iowa. Fig. 13. S. (V.) modesta (Abbt.); front leg of male, paratype, Plummer'e Island, Md. Fig. 14. S. (F.) modesta (Abbt.); male pala, Kerrville, Tex. Fig. 15. S. (F.) virginiensis n. sp.; right clasper, Philadelphia, Pa. Fig. 16. S. (F.) modesta (Abbt.); male pala, Putnam, N. Y. Fig. 17. S. (F.) stigmaiica (Fieber); front leg of male, type, "North America." Fig. 18. S. (F.) modesta (Abbt.); right clasper, Philadelphia, Pa. Fig. 19. S. (F.) stigmaiica (Fieb.)*; pala of male, Putnam, N. Y. Fig. 20. *S. (F.) modesta (Abbt.); male pala, Philadelphia, Pa. Fig. 21. S. (F.) modesta (Abbt.); dorsum of male abdomen, paratype, Pliimmer's Island, Md. Fig. 22. S. (F.) modesta (Abbt.); genital capsule, paratype, Plummer's Is- land, Md. Fig. 23. S. (F.) stigmaiica (Fieb.); genital capsule, type, "N. A." Fig. 24. S. (F.) virginiensis n. sp.; Warrentown, Va., genital capsule. Fig. 25. S. (F.) washing ionensis n. sp.; genital capsule, Adams Lake, B. C. Fig. 26. S. (F.) virginiensis n. sp.; dorsum of male abdomen, Philadelphia, Pa. Fig 27. S. (F.) stigmaiica (Fieb.) ; dor.sum of male abdomen, "North America." * This specimen has a pala which is nearer to S. (F.) stigmaiica (Fieb.) than anything else which we have encountered. We have called it stipmatica, but it may well be merely a varia- tion of m'idestd (Al)ht.). Certainly the number of pegs on the pala is unlike that of the type i)f stif/matica. Western Hemisphere Corixidan 717 PLATE XCIV 718 The University Science Bulletin . PLATE XCV Sigara Vermicorixa Waltou Fig. 1. Siijara {Vermicorixa) knighti n. si).; dor.?al view of male abdomen. Fig. la. Genital capsule of male. Fig. lb. Pala of male. Fig. 2. Sigara {Vermicorixa) muUettensis ( Hungerf ord ) ; dorsal \iew of male abdomen. Fig. 2a. Genital capsule of male. Fig. 2b. Pala of male. Fig. 3. Sigara {Vermicorixa) solensis (Hungerf ord) ; dorsal view of male abdomen. Fig. 3a. Genital capsule of male. Fig. 3b. Pala of male. Fig. 4. Sigara {Vermicorixa) transfigiiraia (Walley); dorsal view of male abdomen. Fig. 4a. Genital capsule of male. Fig. 4b. Pala of male. Fig. 5. Sigara {Vermicorixa) johnstoni n. sp.; dorsal view of male abdc* men. Fig. 5a. Genital capsule of male. Fig. 5b. Pala of male. Western Hemisphere Corixidan 719 PLATE XCV 3. solensts(Hunqfd) 4 tronsfigurato iwalley) 5 lohnstoni n sp 720 The University Science Bulletin PLATE XCVI Sigara Vermicorixa Walton Fig. 1. Sigara (Vermicorixa) hubbelli (Hungerford) ; dorsal view of male abdomen. Fig. la. Metaxyphus. Fig. lb. Pronotal disk of male. Fig. Ic. Head of male. Fig. Id. Genital capsule of male. Fig. le. Pala of male. F.G. 2. Sigara (Vermicorixa) dejecta n. sp.; dorsal view of male abdomen. Fig. 2a. Metaxyphus. Fig. 2b. Pronotal disk of male. Fig. 2c. Head of male. Fig. 2d. Genital capsule of male. Fig. 2e. Pala of male. Fig. 3. Sigara (Vermicorixa) cubiensis n. sp.; dorsal view of male abdo- men. Fig. 3a. Pala of male. Fig. 3b. Genital capsule of male. Fig. 4. Sigara (Phaeosigara) quebecensis* (Walley) ; dorsal view of male abdomen. Fig. 4a. Pala of male. Fig. 4b. Genital capsule of male. Fig. 5. Sigara (Vermicorixa) omani (Hungerford); dorsal view of male abdomen. Fig. 5a. Pala of male. Fig. 5b. Genital capsule of male. Fig. 6. Sigara (Vermicorixa) nd'adensis (Walley) ; dorsal view of male abdcmen. Fig. 6a. Pala of male. Fig. 6b. Genital capsule of male. * S. (P.) quebecensia (Walley) was at first believed to be related to this group, but subse- quent rlipcking of characters has led us to piace it with signata (Fieher) and allied species. Western Hemisphere Corixidan 721 PLATE XCVI 5 omani{Hungfd) 6 revadensniWalley) 46 S22 722 The University Science Billeti N PLATE XCVII Western Hemisphere Corixidan 723 PLATE XCVIII 724 The University Science Bulletin PLATE XCIX Western Hemisphere Corixidan 725 Subgenus Phaeosigara new A group of small species, typified by S. signata (Fieb.). They have a narrow interocular space, the rear margin of the head medianly produced and carinate. Hemelytral pattern with pale figures usually reduced, broken and irregular in shape, often in faint longitudinal series. The males have the right clasper of bizarre shape and the female jjala has the dorsal margin depressed before the tip or the space between dorsal margin and upper palmar row narrow. Subgenotype: Sigara signata (Fieber). Sigara (Phaeosigara) bradleyi (Abbott) (Plate CI, figs. 1, la and lb) 1913. Arctocorisa bradleyi Abbott, J. F. Bull. Brooklyn Ent. Soc. VIII, No. 6, pp. 83 and 8'8 (records Okefenokec Swamp, Blackshear, Cave Springs and Offerman, Georgia, and characterizes in his key). 1915. ArctocorUa bradleyi. Abbott, J. F. Washington Univ. Studies, Vol. II (St. Louis, Mo.), pp. 84-86, PI. XV, figs. t> and 7 (description of new species and records from Georgia). 1917. Arctororixa bradleyi. Van Duzee, E. P. Catalogue of the Hemiptera of America North of Mexico, p. 479'. 1926. Arctocarixa bradleyi, Blatchley. W. S. Heteroptera of Eastern North America, pp. 1073, 1075 (Georgia). 1926. Arctocorixa abjecta Blatchley, W. S. Heteroptera of Eastern North America, pp. 1073, 1075 (Dunedin, Fla.). Size: Length 2.9 mm. to 3.6 mm. Width across eyes .96 mm. to 1.3 mm. Color: General facies medium to dark. Pronotum crossed by 6 regular dark bands about the same width as the pale interspaces. Pattern of clavus and corium broken into many fragments of light and dark, the dark color predominating. Membrane separated from corium by palish line and pattern even more broken than that of corium. Embolium, head, limbs, and venter pale. Structural characteristics: Head four-fifths as long as the pfb- notal disk; interocular space less than the width of an eye; vertex smoothly I'ounded in both sexes as seen from above ; face not hairy ; male fovea broad but shallow; antennal segmentation as follows: 1 : 2 : 3 : 4 : : 12 : 8 : 20 : 10 ^ ; 1 : 2 : 3 : 4 : : 14 : 8 : 22 : 12 $ . Pronotal disk rounded laterally and apically, with faint median carina on anterior fourth; pronotum faintly rugulose; hemelytra smooth and shining, with a few scattered hairs. Lateral lobe of prothorax elongate, slightly constricted at base, anterior distal angle produced, tip obliquely truncate; mesoepimeron moderately broad, but with osteole nearer to tip than to lateral emargination ; base of mesoepimeron inflated, almost concealing the lateral lobe of the 726 The University Science Bulletin protliorax; metaxyphus broader than long, tip blunt. Pala of female slightly depressed dorsally before apex. Front leg of male: pala cultrate, not carinate on dorsal margin, with 16 to 17 large pegs in a single, uninterrupted row; tibia slightly less than half as long as pala, without dorsal carina, and with a round, prominent pad; femur slender, with small patch of stout hairs on inner surface near base. Middle and hind legs slender; hind femur without spines on dorsal surface; proportions of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 42.9 : 32.2 : 38.2; hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 47 : 91.4 : 43.5. I\lale asymmetry dextral; strigil of moderate size, suboval, of 4 regular combs. Left anal lobe incised on inner dorsal margin. For details of male structures see Plate CI, figs. 1, la, and lb: Female abdomen normal. Comparative notes: This is one of the smallest species belonging to Sigara. It is less than 4 mm. long and is distinguished from macrocepsoidea by having a relatively larger pronotum with 6 bands. Location of types: Holotype male and 3 female paratypes from Billy's Island, Okefenokee Swamp, Ga., June, 1912, in the Cornell Collection, Ithaca, N. Y. The type series of A. abjecta Blatchley are from Dunedin, Florida, and are in his collection. He sent me two cotypes which are in the Francis Huntington Snow Entomo- logical Collection, University of Kansas. Data on distribution: (Plate CIV.) Cuba: Camaguey, Sept. 2, 1926, J. Acuna (from Bruner), 10 males, 34 females. U. S. A.: Florida: Lamont, March 8, 1947, L. D. Beamer, 2 males, 5 females; Bunker Branch, Arcadia, March 30, 1938, J. C. Bradley, 2 females, 1 female nymph; Waldo, Aug. 18, 1930, P. W. Oman, 52 males, 26 females; Hilliard, Aug. 31, 1930, P. Oman, 19 males, 15 females; same place, Aug. 19, 1930, J. Nottingham, 91 males, 95 females; same place and date, L. D. Tuthill, 10 males, 8 females; same place, Aug. 31, 1930, R. H. Beamer, 1 male, 2 fe- males; same place and collector, July 8, 1934, 11 males, 7 females; same place, Aug. 6, 1930, Beamer and Hardy, 5 males, 10 females; Ponce de Leon, July 28, 1934, R. H. Beamer, 1 male, 2 females; Ocala, Aug. 17, 1930, P. W. Oman, 3 males, 3 females; Wildwood, Aug. 2, 1930, J. Nottingham, 2 males, 1 female; Sebring, Aug. 5, 1930, same collector, 1 male; Ft. Myers, Aug. 14, 1930, R. H. Western Hemisphere Corixidan 727 Beamer, 1 female; Likely, July 24, 1934, P. McKinstry, 3 females; Wakulla Springs, July 14, 1934, Beamer and McKinstry, 3 males; Loughman, July 20, 1930, P. W. Oman, 1 female; Lake Jovita, July 20, 1934, Beamer and McKinstry, 3 males, 7 females; Archer, July 31, 1930, Beamer and Oman, 19 males, 15 females; Childs, Aug. 6, 1930, same collectors, 10 males, 6 females; Yankeetown, July 31, 1930, Beamer and Nottingham, 3 females; same place, July 17, 1934, P. McKinstry, 1 female; Ft. Mead, Aug. 13, 1930, P. W. Oman, 1 female; Orange Co., Jan. 10, 1938, H. B. Hungerford, 5 males, 4 females; Lacooche, Aug. 10, 1930, P. W. Oman, 5 males, 5 fe- males; Wakullah, July 10-11, 1939, Beamer and Lawson, 5 males, 1 female; Old Town, July 11, 1939, same collectors, 8 males, 26 females; La Belle, July 16, 1939, E. G. Wegenek, 2 females; same place and date, P. B. Lawson, 3 males, 1 female; same place and date, D. E. Hardy, 1 male; same place and date, R. H. Beamer, 2 males, 3 females; Plant City, Aug. 15, 1930, Nottingham and Oman, 2 males; same place, June 10, 1926, C. 0. Bare, 1 male, 1 female; Daytona Beach, July 22, 1939, R. H. Beamer, 1 male, 1 female; Dunedin, Feb. 12, 1922, W. S. G., 2 males, 1 female; Eridn, July 11, 1939, P. B. Lawson, 1 male, 1 female; Cedar Keys, .July 12. 1939, Lawson and Beamer, 1 male, 2 females; Lake City, Aug. 5, 1939, R. H. Beamer, 2 males, 5 females; Starke, Aug. 7, 1939, J. D. Beamer, 2 males, 4 females; De Land, Aug. 8, 1939, J. D. Beamer, 3 males, 1 female; Dunnellon, July 12, 193^, Beamer and Lawson, 7 males, 1 female; Sanford, Aug. 4, 1930, P. W. Oman,- 2 females; same place, Aug. 8, 1939, Beamer and Hardy, 1 male, 8 females; same place, Aug. 22, 1933, C. 0. Bare, 3 males, 1 female; Branford, Aug. 4, 1939, Beamer and Hardy, 13 males, 10 fem.ales; same place, July 16, 1934, R. H. Beamer, 1 female; Orlando, Jan. ]0-12, 1938, H. B. Hungerford, 13 males, 7 females; nr. Orlando, Jan. 10-12, 1938, same collector, 3 males, 10 females; Gainesville, Dec. 14, 1937, same collector, 4 females. Georgia: Okefenokee Swamp, July 30, 1934, R. H. Beamer, 33 males, 62 females; same place and collector, Aug. 3, 1934, 7 males, 8 females; same place and date, J. D. Beamer, 1 male; same place and date, R. H. Beamer, Jr.., 1 male; same place and date, M. E. Griffith, 6 males, 8 females; same place and date, P. A. McKinstry, 6 males, 6 females; same place, July 27, 1939, R. H. Beamer, 4 males, 9 females; same place, July 25, 1939, R. H. Beamer, 12 males, 4 females; same plate and date, J. D. Beamer, 13 males, 3 females; same place and date, P. B. Lawson, 1 male; 728 The University Science Bulletin same place and date, E. G. Wegenek, 2 males, 3 females; same place, Billy's Island, Dec. 26, 1913, 9 males, 3 females; Tifton, Aug. 11, 1939, D. E. Hardy, 1 male; Satilla R., Offerman, April 22, 191], J. C. Bradley (Cornell Coll.), 1 female; Folkston, Aug. 2, 1934, R. H. Beamer, 1 female; Brantley Co., Jan. 3, 1947, L. W. Morgan, 6 males, 8 females; Biackshear, May 10, 1911, 1 male (paratype). Alabama: Grand Bay. July 11, 1934, Beamer and McKinstry, 20 males, 15 females. Mississippi: Fulton, July 14, 1930, P. W. Oman, 1 male; Wave- land, July 9, 1934, P. McKinstry, 1 male. Sigara (Phaeosigara) sigmoidea (Abbott) (PIsitp CI, figs. 2, 2ii :ind 2h) 1913. Arctocurisa siyinoulea Abbott. J. F. Bull. Brooklyn Ent. Soc, VIII, p. 83-89. 91 (Georgia). (Characterized in keys.) 1915. Arctocorisa sigmoidea Abbott. J. F. Wasli. Univ. Studies, Vol. II, pp. 82-83, PI. XV. fig.s. 4 and 8 (Georgia). 192(;. Arctocorisa sigmoidea, Blatcliley, W. S. Heteroptera of Eastern North America, p. 1080 (Georgia). Size: Length 4.1 mm. to 4.5 mm. Width across eyes 1.3 to 1.4 mm. Color: General facies dark with small flecks of pale color. Pro- notum crossed by 8 broad dark bands and 7 narrow pale lines. Clavus and corium dark, with pale flecks scattered about; outer distal angfe of corium pale as in S. signata (Fieb.). Membrane and corium separated by indistinct palish line; pattern like that of corium except pale areas a little larger.. Embolium, head and limbs pale ; venter pale to smoky. Structural characteristics: Head of male nearly three-fourths as long as pronotal disk, that of female two-thirds as long; interocular space narrow, about half as broad as the width of an eye; vertex smoothly rounded in both sexes as seen from above; face not hairy; male fovea oval, shallow, and narrow, poorly defined; antennal seg- mentation: 1 : 2 : 3 : 4 : : 13 : 10 : 25 : 15 J ; 1 : 2 : 3 : 4 : : 13 : 10 : 28 : 15 5 . Pronotal disk rounded laterally and apically, witii median carina faintly visible on anterior third; jironotum finely rastrate; hemelytra faintly rugulose with occasional pale hairs. Lateral lobe of prothorax long and tongue-shaped; base of meso- epimeron inflated, often almost concealing the prothoracic lobe; mesoepimeron moderately broad, but osteole nearer to tip than to lateral bend; metaxyphus considerably broader than long, margins Western Hemisphere Corixidax 729 often forming a little more than a right angle apically. Front leg of female: pala depressed dorsally near apex. Front leg of male: pala broad with dorsal margin sigmoid, not carinate basally, with 7 distal pegs longer than the basal pegs which number 12 to 15. See Plate CI, fig. 2a. Tibia about half as long as pala, with pro- nounced carina which projects laterally as seen in dorsal view; fe- mur slender with patch of stridulatory pegs on inner surface, ar- ranged in about 12 rows. Middle and hind legs long and slender; hind femur with row of spines distally on dorsal inner margin; proportions as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 44.7 : 29.8 : 44.7. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 75 : 96.4 : 35.7. Male asymmetry dextral; strigil small, elongate, of 7 regular combs. Right margin of seventh abdominal segment lat- erally produced. Inner dorsal margin of left anal lobe incised. For details of male structures see Plate CI, figs. 2, 2a and 2b Female abdomen normal. Comparative notes: This species runs out in the key with 8. (P.) zimmermanni (Fieb.) from which it may be separated by the row of short spines on the dorsal inner (or posterior) margin of the hind femur. Location of types: Cornell Collection, Ithaca, N. Y., has lecto- type male and 3 male and 4 female paratypes from Billy's Island, Okefenokee Swamp, Ga., June, 1912. One pair of these has been placed in the Francis Huntington Snow Entomological Museum, University of Kansas. Data on distribution: (Plate CIV.) Florida: Hilliard, Aug. 31, 1930, P. W. Oman, 41 males, 3 fe^ males; same place, July 28, 1934, R. H. Beamer, 40 males, 120 females; Dunedin, March 20, 1927, AV. S. Blatchley (Lutz Coll.), 2 males (labeled "autotype A. abjecta Blatchley, Oct. 18, 1936") ; Punta Gorda, March 23, 1941, H. Ramstadt (Field Mus. Coll.), 1 female; Wildwood, Aug. 2, 1930, J. 0. Nottingham, 3 females; same place and date, P. W. Oman, 4 males, 1 female; same place and date, R. H. Beamer, 4 males, 1 female; Ponce de Leon, July 13, 1934, R. H. Beamer, 2 males, 5 females; Coconut Grove, Aug. 9, 1930, P. W. Oman, 4 females; Loughman, Aug. 4, 1930, R. H. Beamer, 1 female; Sanford, Aug. 4, 1930, P. W. Oman, 10 males. 27 females; same place, Aug. 8, 1939, J. D. Beamer, 1 male, 2 fe- males; Plant City, Jan. 4, 1927, C. O. Bare, 2 males; same place. Aug. 15, 1930, P. AV. Oman, 1 female; same place, July 27, 1926, 730 The University Science Bulletin C. 0. Bare, 7 males, 8 females; Wakulla Springs, July 14, 1934, R. H. Beamer, 5 males, 8 females; same place and date, P. Mc- Kinstry, 6 males, 6 females; Lake Jovita, July 20, 1934, Beamer and McKinstry, 9 males, 18 females; Lakeland, Nov. 10, 1911 (Am. Mus. Nat. Hist.) 3 males, 5 females; Gainesville, Dec. 14, 1937, H. B. Hungerford, 2 males; Old Town, Aug. 10, 1939, R. H. Beamer, 1 male; De Land, Aug. 8, 1939, J. D. Beamer, 6 males, 3 females; AValdo, Aug. 18, 1930, P. W. Oman, 3 males; Lacoochee, Aug. 9, 1939, J. D. Beamer, 4 males, 4 females; Starke, Aug. 7, 1939, J. D. Beamer, 13 males, 7 females; La Belle, July 16, 1939, J. D. Beamer, 1 male, 2 females; Gainesville, 1914 (Am. Mus. Nat. Hist.), 1 male, 1 female; Fort Myers, Nov. 10, 1911 (Am. Mus. Nat. Hist.), 1 female; Titusville, Nov. 8, 1911 (Am. Mus. Nat. Hist.), 3 females; Jacksonville (Cornell), 1 male. Georgia: Baker Co., Dec. 23, 1946, L. W. Morgan, 2 males, 1 female; Brantley Co., Jan. 3, 1947, L. W. Morgan, 6 males, 12 fe- males; Okefenokee Swamp, July 25, 1939, R. H. Beamer, 13 males, 10 females; same place, July 27, 1939, J. D. Beamer, 10 males, 10 females; same place, July 25, 1939, E. G. Wegenek, 1 male, 2 fe- males; same place, July 30, 1934, P. McKinstry, 65 males, 70 females; same place and date, M. E. Griffith, 32 males, 69 females; same place, Mixon's Hump, June 16, 1912, 1 male, 1 female; same place, Billy's Island, June, 1912, 1 female; Blackshear, May 10, 1911, J. C. Bradley, 2 females; Thomasville, Aug. 28, 1927, C. H. Martin, 1 female. North Carolina: Southern Pines, March 13, 1916, A. H. Manee, 1 male, 3 females (Parshley Coll.). Sigara (Phaeosigara) zimmermanni (Fieber) (^ compressa Abbott) (■Plate Cl, figs. 3-3c) IS.")!. Corisa zimmermanni Fieber, F. X. Species Generis Corisa, p. 21; PI. 1, fig. 18 (Pennsylvania, "Carolina"). 1909. Arctncnrisa zimniernianni, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Cata- logue in Proc. Ent. Soc. Wash., X, p. 197. 1913. Arcfncorisa compressa Abbott, J. F. Bull. Brooklyn Ent. Soc, Vlll, pp. 83, 88, 91, PI. fig. 6 (Georgia). Characterized in keys. 1915. Arctorori-a com-pressa, Abbott, J. F. Wash. Univ. Studies (St. Louis, Mo.), II, pp. 81-82, PI. XV, figs. 1-3 (Georgia). 1917. Arciocorisa compressa, Parshley, H. M. Oeca.sional Papers of the Boston Soc. Nat. Hist., VII, p. 118. 1917. Arctocorixa compressa. Van Duzee, E. P. Catalogue of the Hemipfera of America North of Mexico, p. 479. 1917. Arrtororixa zivimcrmanni, Van Duzee, E. P. Catalogue of the Hemiptera of America North of Mexico, p. 485. 1922. Arctocorixa compressa, Drake, Carl .1. Tech. Pub. No. 16, New York State College of Forestry at Syracuse University, p. 86. [This is S. signata (Fieb.).] Western Hemisphere Corixidan 731 1923. Arctocorisa compressa, Abbott, J. F., in "Guide to tlie Insects of Connecticut," Part IV, "The Hemiptera or Sucking Insects of Connecticut," p. 390, fig. 36 (15); (Haiiulen, Conn., Southern States). 1926. Arctocorixa compressa, Blatfhiey. W. S. Heteroptera of Eastern North America, p. 1078 (Connecticut, Georgia). 1928. Arctocorisa compresta, Torre-Bueno, J. R. de la, in "A List of the Insects of New York," Cornell Univ. Exp. Sta. Memoir 101, p. 141 (Cranberry Lake, N. Y.). This is Drake's record and is S. siqnata (Fieb.). 19'29. Sigara zimmermanni, Lundblad, O. Archiv. fiir Hydrobiologie, Bd. XX, p. 310, PI. XI, fig. 4 (hemelytron of 5 type). 1929. Sigara zimmermanni. Lundblad, O. "Zoologischer Anzeiger," Bd. 80, Heft 7/9. pp. 201-204, text figs. 12-15; (redescription). 1931. Sigara ziin)ncrma)ini, Lundblad, O. "Zoologischer Anzeiger," Bd. 96, Heft 3/4, p. 87 (allotype 5 in Berlin Mus. and holotype ^ in Halle Mus.). 1936. Arctocorixa zimmermanni, Walley, G. S. Canadian Entomologist, LXVIII, p. 60 (Georgia and South Carolina). (Says A. compressa Abbott is synonym.) 1938. Arctocorixa compressa, Brimley, C. S. Insects of North Carolina, p. 84. Size: Length 4.5 mm. to 5 mm. Width across eyes 1.5 mm. to 1.6 mm. Color: General facies dark. Pale markings often scarcely dis- cernible because they may be nearly as dark as the brown figures, (^n pronotum 7 to 9 dark brown bands; on clavus and corium paler figures are obscure mottlings with no definite arrangement but faintly longitudinal; a pale area at outer apical angle of corium; membranal suture indefinite, pattern obscure. Embolium grayish yellow as are head, limbs and venter. Structural characteristics: Head two-thirds to three-fourths as long as pronotal disk, the rear margin medianly produced, carinate and punctate; postocular space broadest at inner angles of eyes, rear margins of eyes almost straight; interocular space narrower than the width of an eye; vertex smoothly rounded as seen from above; male fovea scarcely discernible, face merely slightly flattened; antennal segmentation: 1 : 2 : 3 : 4 : : 16 : 11 : 30 : 22 c? ; 1 : 2 : 3 : 4 : : 16 : 12 : 30 : 22 $ . Pronotal disk rounded laterally, slightly pointed distally; median carina on anterior third; pronotum finely and hemelytra but lightly rastrate, the latter with scattered pale hairs. Lateral lobe of prothorax elongate, tip ob- liquely truncate to rounded ; mesoepimeron narrow, ostcole near tip ; metaxyphus slightly broader than long, sides narrowing toward tip. Front leg of female with dorsal margin of pala depressed. Front leg of male: pala sinuous as seen in dorsal view, not carinate on dorsal margin, peg row curving from base toward dorsal margin and following it to apex, consisting of 20 pegs; tibia not quite half as long as pala, with no dorsal carina and a very thin pad; femur slender with about 9 rows of stridulatory teeth on inner surface. Middle and hind legs slender; hind femur without dorsal spines and 732 The University Science Bulleti N under side more than half pilose; the comparative measurements of i-egments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 42 : 30 : 40. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 79.9 : 111.2 : 38.9. Male asymmetry dextral; strigil small, elongate, of 5 regular combs. Right tergite of seventh abdominal segment long, reaching almost as far caudad as tips of anal lobes, right margin with a lateral projection. For details of male structures sec Plate CI, figs. 3, 3a, 3b, and 3c. Female abdomen normal. Comparative notes: A little larger than S. (P.) sigmoidea (Ab- bott) and its pattern less definite. Location of types: Fieber's types in the museum at Halle, Ger- many, and Berlin Museum. They came from "Pennsylvania" and "Carolina" (Zimmermann. Mus. Hal. ! et Coll. Germ.). These I have studied. Abbott's types, four males and four females from Mixon's Hammock, Ga., in the Cornell Collection, Ithaca, N. Y. Two of the paratypes now in the Francis Huntington Snow Ento- mological Museum, University of Kansas. Data on distribution: (Plate CIV.) Texas: (Uhler Coll.), 6 males, 5 females. Mississippi: Beaumont, April 19, 1932. H. Dietrich (U. S. N. M.), 8 males, 14 females. Alabama: Grand Bay, July 11, 1934, R. H. Beamer, 1 male, 1 female. Florida: Waldo, Aug. 18, 1930, P. W. Oman, 24 males; Hilliard, Aug. 31, 1930, same collector, 20 males, 1 female; same place and date, R. H. Beamer, 1 male, 2 females; same place and collector, Aug. 28, 1934, 15 males, 19 females; same place, Aug. 19, 1930. J. Nottingham, 1 female; Suwanee Springs, July 29, 1930, J. Notting- ham, 1 female; Ponce de Leon, July 13, 1934, R. H. Beamer, 1 male, 5 females; Branford, July 16, 1934, R. H. Beamer, 1 female; Gaines- ville, July 14, 1918, C. J. Drake (Drake) ; Lamont, March 8, 1947, L. D. Beamer, 1 male, 5 females; E. Florida, Ashmead, 1 female. Georgia: Folkston, Aug. 2, 1934, R. H. Beamer, 3 males, 4 fe- males; Okefenokee Swamp, Aug., 1934, same collector, 1 male, 1 fe- male; same place, Aug. 30, 1934, J. D. Beamer, 1 male; same place, Aug., 1934, McKinstry and Griffith, 3 males, 8 females; same place, July 25, 1939, R. H. Beamer, 27 males, 26 females; same place, June 16, 1912 (Cornell U. Coll.), 3 males, 1 female; Blackshear, May 10, 1911 (Cornell Coll.), 2 males, 1 female; Okefenokee Swamp, Dec. 26, 1913 (Abbott Coll.), 1 male. Western Hemisphere Corixidan 733 South Carolina: Bennettsville, Nov. 17, 1931, O. L. Cartwright (S. C. Exp. Sta. Coll.), 1 female. North Carolina: Raleigh, December (Abbott Coll.), 2 males, 8 fe- males; Southern Pines, Aug. 15, 1916, A. H. Manee (U. S.N. M.), 1 male, 1 female; Raleigh, Dec, 1 male; Hendersonville, July, 1907, F. Sherman, 1 male. Virginia: Norfolk Co., May 11, 1911, G. E. Gould (U. S. N. M.), 1 male. Washington, D. C: March, 1910 (O. Heidemann. Cornell U.), 1 male. Pennsylvania: Castle Rock, July 18, 1941, J. C. Lutz, 1 male, 1 female. New York: White Plains, Sept. 13, 1919 (Torre-Bueno) , 1 male, 2 females. Connecticut: Hamden, June 1, 1911, B. H. Walden, 1 male. Massachusetts: Saugus, Aug. 22, 1914, H. M. Parshley (Parsh- ley Coll.), 1 female; Northampton, Sept. 9, 1920, Louise Smith (Parshley Coll.), 1 male, 2 females; Sherborn, Sept. 7, 1916, C. A. Frost, 3 females; Framingham, May 2, 1915, same collector, 1 fe- male. Maine: Oruno, July 15, 1910 (Cornell Coll.), 1 male (labeled by Abbott as a paratype of A. seriata Abbt.). Ohio: Delaware, June 26, 1916, C. J. Drake (Drake). Michigan: Ann Arbor, July 9, 1921, R. F. Hussey (Hussey Coll.), 1 male. Sigara iPhaeosigara) variabilis (Hungerford) (Text fig. 18; wash drawing No. 3(i, Plate VI) 1926. Arctocorixa vanaboUs* Hungerford, H. B., Bull. Brooklyn Ent. Soc, \o\. 21, pp. IflS-lGQ, figs. 2 and 7 (Michigan, New Brunswick). 1930. Arctocorixa variabilis, Walley, G. S., Can. Ent., Vol. LXII. No. 12, p. 281 (On- tario). Size: Length 5.3 mm. to 5.9 mm. Width across eyes 1.7 mm. to 1.8 mm. Color: General facies very dark, nearly black, the yellow bars almost obliterated; pronotum with 6 broad, dark bands with very narrow spaces between which are only a little lighter than dark bands; a pale median line down pronotum; a few pale, transverse mottlings on clavus and corium. Membrane separated from corium by a pale line, pattern dark with a few pale mottlings. Embolium Typographical error. Correctly spelled on type labels. 734 The University Science Bulletin and head smoky, limbs and thoracic venter pale; abdomen smoky to black. Structural characteristics: Head three-fourths as long as pro- notal disk; interocular space narrower than the width of an eye; vertex projecting beyond curve of eyes as seen from above in both sexes; male fovea oval, shallow, not attaining eyes laterally; face not hairy; antennal segmentation: 1 : 2 : 3 : 4 : : 20 : 20 : 40 : 30 J ; 1 : 2 : 3 : 4 : : 20 : 20 : 40 : 30 $ . Pronotal disk angulate laterally and apically, median carina on anterior third; pronotum and hemelytra moderately rastrate, the latter with scattered pale hairs; pruinose area of embolar groove posterior to nodal furrow longer than that of claval suture. Lateral lobe of prothorax elon- gate, narrow, tip obliquely truncate and slightly inflated; meso- epimeron narrow with osteole near ti]); metaxyphus broader than long, tip blunt. Front leg of female of usual shape but with pala depressed on dorsal margin. Front leg of male: pala greatly thick- ened and carinate on outside, short in comi)arison to breadth, with row of 22 to 24 pegs curving aincally; tibia three-fourths as long as pala, with short dorsal carina find no pad; femur slender with a pilose area on inner surface. Middle and hind legs slender; one ^r two rows of pegs on dorsal margin of hind femur; the propor- tion of segment to segment as follows : Middle leg: femur : tibia : tarsus : claw :: 100 : 42.8 : 26.7 : 46.8. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 78.9 : 113.1 : 39.5. Male asymmetry dextral ; strigil moderately large, oval, of 6 regular combs. For details of male structures see text fig. 18. Anal lobes of female not notched on inner ventral margins. Comparative notes: The depression in tlie dorsal margin of the female pala places this species close to the signata group, but the structures of the male show considerable difference. The greatly thickened male pala is a distinctive character. Location of types: Holotypc male, allotype female, and 9 male and 3 female paratypes, labeled ''Nigger Creek, Mullett Lake, near Topinabee, Michigan, July 30, 1925, H. B. Hungerford"; same place and collector, Aug. 4, 1925, 4 male and 1 female paratypes; the above series in the Francis Huntington Snow Entomological Collec- tions. One male and 4 female paratypes from St. Croix R., N. B., Oct. 23, 1893, W. C. Kendall in the Cornell Collections, Ithaca, New York. Data on distribution: (Plate CIV.) Western Hemisphere Corixidan 735 Canada: New Brunswick: See type series above. Quebec: Fairy L, May 16, 1927 (Walley). Ontario: Jock River, May 21, 1927 (Walley) ; Ottawa, April 16, 1927 (Walley). U. S. A.: Connecticut: Hamden, June 1, 1911, B. H. Walden, 1 female; Tiinvis, St. Forest near Mass. border, July 26. 1942 (Hutchinson) ; Storrs, Aug. 4, 1946, R. H. Beamer, 2 males, 2 fe- males; also Aug. 13, 1946, 16 males, 9 females. New Jersey: lona, July 7, 1938, J. C. Lutz HI (Lutz Coll.), 2 males, 1 female; Trenton, Sept., 1903 (Hussey), 1 female. Washington, D. C: 0. Heidemann (Cornell U.), 1 female. Virginia: Vienna, Sept. 19, 1931, P. W. Oman, 3 males. Illinois: Lake Forest, Oct. 11, 1906, 4 males, 7 females (Cornell). Michigan: See type series above; Cheboygan Co., Aug. 2, 1934, H. B. Hungerford, 1 female; Douglas L., July, 1927, H. B. Hunger- ford, 1 female. variabilis (Hungfd.) Fig. 18. Sigara (Phaeosigara) variabilis (Hungfd.) ; (a) genital capsule of male; (b) front leg of male; (c) dorsal view of male abdomen. Sigara { Phaeosigara) compressoidea (Hungerford) (Text fig. 19) 1928. Arctocorixa compressoidea Hungerford, H. B., Can. Ent. LX, p. 22G, Plate 18, figs. 9 and 13 (Douglas Lake, Mich.). 1936. Arctocorixa compressoidea, Walley, G. S., Can. Ent., Vol. LXVIII, No. 3, p. 62 (records from Merivale, Ont.). Size: Length 5.2 mm. to 5.6 mm. Head width 1.6 mm. to 1.8 mm. Color: General facies dark. Pronotum with transverse brown bands wider than pale interspaces; caudal pale spaces deeply im- 736 The University Science Bulletin pressed; dark bands interrupted down middle by a longitudinal pale band. Pale bands of clavus obliquely transverse and entire at base; apical ones slender, broken, and few in number. Pale lines of corium also slender and broken, sometimes only transverse dashes arranged in longitudinal series. Membrane smoky brown, pattern almost obliterated. Embolium reddish yellow to smoky. Limbs and venter pale; head usually pale with vertex darkened. Anal lobes of females sometimes tinged with red on ventral side. Structural characteristics: Head two-thirds as long as pronotal disk ; interocular space slightly less than or about ecjual to the width of an eye; vertex protruding slightly beyond curve of eyes as seen from above, especially in the male; faces of both sexes with a few long, pale hairs; male fovea oval, small, shallow; antennal seg- mentation as follows: 1 : 2 : 3 : 4 : : 18 : 17 : 30 : 22 ^ ; 1 : 2 : 3 : 4 : : 20 : 18 : 32 : 22 5 . Pronotal disk with lateral margins obliquely truncate, apex angulate; median carina on anterior fourth; pro- notum and hemelytra strongly rastrate; a few scattered pale hairs on hemelytra; lateral lobe of prothorax elongate, sides parallel, tip rounded; thoracic region inflated, mesoepimeron moderately broad with osteole about half way between tip and lateral bend; meta- xyphus broader than long, triangular, apex pointed. Female front leg with pala slightly depressed on distal dorsal margin. Front leg of male: pala curved inward as seen in dorsal view as in S. zini- mermanni (Fieb.), distal pegs long and on an overhanging ledge, 20 to 22 pegs in a single row about midway between dorsal margin and palm, not carinatc on outside; tibia two-thirds as long as pala, with only a very slight carina and no pad; femur relatively slender with about 12 rows of stridulatory teeth on inner surface arranged longitudinally. Middle and hind legs slender; hind femur with 1 to 3 spines dorsally; the proportions of segment to segment as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 45.5 : 30.9 : 41.9; hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 80 : 100 : 42.9. Male asymmetry dextral; strigil large, oval, of 6 to 10 fairly regular combs. Right tergite of seventh abdominal segment large and long, extending more than half way down the edge of the right anal lobe. Male genital capsule with right clasper slightly notched at tip. For details of male structures see text fig. 19. Female abdomen normal. Comparative notes: Pala of male, as seen from above, much like A. compressa Abbott (== zimmermanni Fieb.) ; hence the name. In our key it is near S. (P.) 'mackinacensis Hungerford but is more rastrate. Western Hemisphere Corixidan I'M Location of types: Described from 33 specimens taken in pools near shore of Douglas Lake (Cheboygan Co.), Michigan, by H. B. Hungerford. Holotype, allotype and paratypes (8 males, 23 fe- males) in the Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate CIV.) Canada: Ontario: Cranberry Creek, Algonquin Park, April 1, 1936. R. D. C. Martin (recorded by Walley). U. S. A.: Maine: Orono, April 19, 1914, H. M. Parshley (Parsh- ley Coll.), 1 male. Massachusetts: Sunderland, Sept. 23, 1917, H. M. Parshley (Parshley Coll.), 1 female. Connecticut: Cornwall, July 5, 1919, M. P. Zappa, 1 male. New York: Long Island, July 29, 1935, J. C. Lutz (Lutz Coll.), 1 male; Cranberry Lake, July 22, 1919, Kaplan, 1 male, 4 females (Drake Coll.) ; Ithaca, 1890, 2 males, 1 female; Wanakena, Aug. 25, 1920, C. J. Drake (Drake Coll.) ; Franklin Co., Oct. 13, 1900, W. J. Gerhard, 1 male; Wanakena, Aug. 21, 1919, C. J. Drake, 2 females. New Jersey: Bear Swamp, July 27, 1911 (Amer. Mus. Nat. Hist.), 4 males, 2 females; Ramapo, May 31, 1901, 1 male, 1 female; River- ton, Aug. 17, 1902, Van Duzee (Van Duzee) ; Trenton, Sept., 1903 (Hussey) , 1 male. Maryland: Hyattsville, Aug. 23, 1914, W. L. McAtee (U. S. N. M.), 1 male, 2 females. Washingt07i, D. C: Sept. 21, 1890 (0. Heidemann Coll., Cornell U.), 2 males, 2 females. North Carolina: Raleigh, January, 1 male; Jocasee, Sept. 6, 1927, D. Dunavan (S. C. Exp. Sta.), 1 male, 2 females. South Carolina: Walhalla, March 24, 1929, D. Dunavan (Clem- son College) . Michigan: Ann Arbor, Mr. Clapp (Mich. Coll.), 1 female; same place, Miss Haynes (Mich. Coll.), 1 female; Pentwater, July 17, 1916, E. Liljeblad (Field Mus.), 1 male, 1 female; (Uhler Coll.), 1 male; Lake Gogebic, Aug. 18, 1937, R. H. Beamer, 2 males; Doug- las Lake, East Fishtail, July 6, 1923, H. B. Hungerford, 6 females; same place. Sedge Pool, July 13, 1923, same collector, 5 males, 21 females; same place and collector, July 17, 1923, 1 male; same place and collector, Bryant's Bog, July 29, 1923, 1 male; same place and collector, Aug. 3, 1923, 1 male, 1 female; Bois Blanc Island, Aug. •:7— 822 738 The University Science Bulletin 14, 1923, same collector, 1 male; North Michigan, Aug. 23, 1930, same collector, 2 females. Wisconsin: Dane Co., March 16, 1930, E. P. Breakey, 4 females; same place and collector, April 19, 1930, 3 females. Minnesota: Beaver Dam, Aug. 12, 1922, H. B. Hungerford, 15 males, 38 females; Eveleth, Aug. 13, 1937, C. L. Johnston, 2 males; North Branch, June 17, 1922, C. E. Mickel (Minn. Coll.), 1 female; Bird's Island, Aug. 25, 1921, W. E. Hoffmann (Minn. Coll.), 1 male; St. Paul, Hussey's Pond, Aug. 7, 1921, W. E. Hoffmann (Minn. Coll.), 1 female; Pine River, Big Trout Lake, slough, Aug. 28, 1942 (H. C. Severin), 1 male, 1 female. South Dakota: McVille, July 27, 1937, R. H. Beamer, 1 female. compressoioea (Hungfd) Fig. 19. Sigara (Phaeosigara) compressoidea (Hungfd.) ; (a) genital cap- sule of male; (b) front leg of male; (c) dorsal view of male abdomen. Sigara (Phaeosigara) quehecensis (Walley) (Plate XCVI, figs. 4, 4a and 4!)) 1930. Arctocorixa quebecensis Walley, G. S., Can. Ent. Vol. LXII, p. 281, key p. 285, PI. XXI, figs. la-Id (Knowlton, Quebec). Size: Length 4.5 mm. to 4.8 mm. Width across eyes 1.5 mm. to 1.6 mm. Color: General facies dark brow^n, tinged with red especially on outer distal portion of corium. Pronotum crossed by 5 or 6 dark bands equal in width to pale interspaces; median carina reddish. Dark color dominant on clavus and corium; in some specimens these areas are solid brown to reddish brown with margins and sutures pale; in others there are irregular splotches of pale yellow Western Hemisphere Corixidan 739 arranged in no definite pattern. Membrane pale with faint indica- tion of pattern basally in some specimens; in others pale through- out. Embolium pale distally, smoky at base. Head and limbs pale. Venter smoky to black. Structural characteristics: Head of male four-fifths as long as pronotal disk, that of female two-thirds as long; male head cap- shaped ; interocular space about equal to the width of an eye ; vertex of male rounded out beyond eye margins as seen from above; face somewhat hairy; male fovea poorly defined, narrow and very shallow; antennal segmentation: 1 : 2 : 3 : 4 : : 18 : 14 : 30 : 21 ^j ; 1 : 2 : 3 : 4 : : 20 : 17 : 33 : 22 $ . Pronotal disk twice as broad as long, rounded laterally and distally; median carina visible on anterior third; pronotum and hemelytra rugulose, the latter prac- tically without hairs; pruinose area of cmbolar groove posterior to nodal furrow equal in length to that of the claval suture. Lateral lobe of prothorax elongate, anterior distal angle slightly produced, tip rounded; mesoepimeron narrow with osteole near tip, basal por- tion expanded, almost hiding the prothoracic lobe; metaxyphus as broad across base as long, but with margins narrowing toward tip which is rather blunt. Foreleg of female of usual shape. Foreleg of male: pala cultrate, dorsal margin curved ai)ically, broader across apical third than across base, about 18 pegs; tibia two-thirds as long as pala with a faint dorsal carina and a small pad; femur slender, ventral margin tumid, inner surface with about 9 rows of stridulatory pegs. Middle and hind legs slender; hind femur with 3 or, at the most, 4 stout pegs on distal portion of the rear margin on ventral side; proportions of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 42.6 : 32 : 42.6; hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 77.8 : 102.6 : 40.4. Male asymmetry dextral; strigil large, elongate, of 7 regular combs. Right clasper of male genital capsule very narrow through- out its length. For details of male pala, abdomen and genitalia see figs. 4, 4a and 4b. Plate XCVI. Female abdomen normal. Comparative notes: The color pattern of this species is quite distinct from others of the group. It is most closely related to S. {V ermicorixa) cubiensis but the shape of the male structures will readily separate these species. Location of types: Holotype male, allotype female, and 5 male and 9 female paratypes, from "Knowlton, Que., July 6, 1929, G. S. Walley," No. 3095 in the Canadian National Collection, Ottawa, Canada. Two paratypes, male and female, with same data as 740 The University Science Bulleti N above, in Francis Huntington Snow Entomological Collections, Uni- versity of Kansas. Data on distribution: (Plate XCIX.) Canada: Quebec: Knowlton, July 6, 1929, G. S. Walley, 1 male, 1 female (paratypes). U.S.A.: Neiv Hampshire; Hampton, April 23, 1922, S. Albert Shaw, 2 males. Connecticut: (Hutchinson Coll., Yale). Sigara (Phaeosigara) mackinacensis (Hungerford) 1928 (Plate C, figs. 2, 2a and. 2b) 1928. Arctororixa mackinncensis Hungerford, H. B., Can. Ent. ^'ol. LX, p. 228, PI. 18, figs. 1 and 4 (Mackinac Lsland, Mich.). 1930. Arctocorixa mackinacensis, Walley, G. S., Can. Ent., Vul. LXII. No. 12, p. 280 . (Redesc. type and says A. fazi Hungerford is syn.) 1935. Sigara trimaculata, de Carlo, Jose A. Revista Chilena des Historia Natural, pp. 108, 109. (Catalogue.) Size: Length 7.3 mm. to 7.6 mm. Width of head across eyes 2.3 mm. to 2.5 mm. Color: General facies medium to dark. Pronotum crossed by 7 to 8 fairly regular brown bands which are equal to or narrower than pale interspaces. Base of clavus irregularly cross-banded; pattern elsewhere vermiculate. brown and pale pigment about even in distri- bution. Pale line separating membrane from corium. Embolium smoky. Head and abdominal venter smoky; limbs and thoracic venter pale. Structural characteristics: Head about half as long as pronotal disk; vertex rounded as seen from above in both sexes; facial hairs few; male fovea narrow and shallow, not well' defined; interocular space equal to or a Iktle less than the width of an eye; antennal segmentation: 1 : 2 : 3 : 4 : : 23 : 18 : 43 : 32 males; 1:2:3:4:: 24 : 20 : 43 : 33 females. Pronotal disk with median carina on an- terior third; finely rastrate, rounded apically; hemelytra faintly rugulose, membrane shining, with a few pale hairs. Pruinose area of embolar groove posterior to nodal furrow a little shorter than the pruinose area of the claval suture. Lateral lobe of prothorax three-fourths as wide at base as long, rounded apically; meso- epimeron narrow with osteole near tip; metaxyphus longer than broad, tip broadly rounded. Front leg of female of usual shap3. Front leg of male: Pala elongate with upper and lower margins nearly parallel, 30 pegs in curved row, base of pala with a small tubercle on dorsal surface; tibia about half as long as pala, with a short dorsal carina and a pad; femur slender with 9 rows of stridula- tory pegs on inner surface. Middle and hind legs slender; middle femur armed with se^•eral rows of stout spines in both sexes; seg- mental proportions: Middle leg: femur : tibia : tarsus : claw : : 100 : 37.5 : 24.2 : 37.5. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 88.9 : 772 The University Science Bulletin 109.4 : 38.5. Male asymmetry dextral; strigil large, elongate, of 8 or 9 narrow, irregular combs; median lobe of seventh abdominal segment a broad, triangular plate; right margin of same segment with a small triangular projection. For details of male pala, ab- domen, and genitalia see Plate CVII, figs. 3, 3a, 3b and 3c. Comparative notes: This species may be separated from all S. A. Tropocorixa, except jensen-haarupi Jacz., by having the femora of the middle leg armed with several rows of stout spines, and from the latter species by reason of its large size, being, in fact, the largest of this group. Location of types: In 1928 I found in the Paris Museum an old dilapidated specimen of my A. fazi bearing a written label "Corixa trimaculata Le G., St. Cristoval, Chili." I took this to be Le Guil-' lou's type but the specimen is a long way from being 10 mm. long as described by Le Guillou, even in its stretched out condition! I was quite shocked for M. Le Guillou had given the following de- scription: "18. Corixa trimaculata. Capite bruneo; elytris sub- nigris (sic); punctis fuscis numerosissimis ; tribus maculis bruneis cerca apicem (L. 10 m., larg. 2% mm. Hab. le Chili)." I was ex- pecting, therefore, a species nearly as large as H. interupta (Say) of North America. Jaczewski 1933 also examined this male type and reported that *S. fazi Hungerford is a synonym. Types of A. fazi Hungfd. in the University of Kansas collections. Data on distribution: (Plate CXII.) Chile: Limache, A. Faz, 5 males, 14 females; Santiago, Alfredo Faz, 2 females; Prov. Valparaiso, A. Faz, 3 females; Termas Cau- quenes, Dec. 15, 1922, Alfredo Faz, 168 males, 202 females. Brazil: Porto Alegre, Herm. Soyaux leg., ded. 23, X, 1901, 1 fe- male. Paraguay: Horqueta, Dec. 7, 1934, Alberto Schulze, 6 females (Drake Coll.). Sigara [Tropocorixa) jemoridens Hungerford 1939 (Plate CXI, 3 figures) 1939. Sigara jemoridens Hungerford, H. B. .11. Kans. Ent. Soc. \o\. X\'. No. 3, p. 97, 1 pi. Size: Length 6.3 mm. to 6.7 mm. Width of head 2.1 muL to 2.3 mm. Color: General facies medium brown. Pronotum crossed by 10 narrow dark lines, some of them not quite reaching to lateral mar- gins of disk. Dark pattern of hemelytra reticulate, in narrow, wavy Western Hemisphere Corixidan 773 lines; corium and membrane indistinctly separated by brownish line; jiattern of membrane reticulate. Embolium, head, and limbs pale; abdominal venter smoky in males, pale in females. Structural characteristics: Head of male two-thirds as long as l)ronotal disk, that of female half as long; postocular space broadest at inner angles of eyes; intcrocular space equal to or slightly greater than the width of an eye; vertex of male projecting beyond curA'e of eyes as seen from above; faces with a few long hairs; male fovea deep, rather broad, not quite attaining eyes laterally; antennal segmentation: 1 : 2 : 3 : 4 : : 30 : 20 : 40 : 30 5 . Pronotal disk broad and somewhat reduced laterally (colored portion not ex- tending quite as far laterad as basal angles of clavus) ; apex rounded, faint median carina on anterior fourth of disk; pronotum and hemelytra nonrastrate, somewhat rugulose, the hemelytra with scattered pale hairs; pruinose area of embolar groove posterior to nodal furrow equal in length to that of claval suture. Lateral lobe of prothorax elongate, sides parallel, apex rounded and anteriorly dejjressed; mesoei)imeron narrow with osteole near the tip; meta- xyphus slightly longer than broad, tongue-shaped, the apex blunt. Front leg of female of usual shape. Front leg of male: pala cultrate, fairly broad, not carinate on outside near base, with about 35 pegs in a row half way between dorsal margin and |mlm; tibia about half as long as pala, with a short dorsal carina and a small pad; femur slender, without stridulatory teeth, and with the ventral margin angulate near apex. (See Plate CXI.) Middle and hind legs slender; middle femur not spinose. Segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 44.3 : 32.3 : 41.(1 Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 92.1 : 112.4 : 47.3. Male asymmetry dextral.' Strigil small, elongate, of 3 regular combs. Right margin of seventh abdominal segment not ))r()duced. Right clasper of male genital capsule forked apically. For details of male structures see Plate CXI. Female abdomen normal. Comparative notes: The male genitalia shows relation to that of T. denseconscripta (Breddin) and T. denseconscriptoidea (Hunger- ford), but may be sejiarated from them by having the pronotal disk reduced. It may be separated from T. termasensis (Hungerford) , which also has a reduced pronotum, by the shape of the male right clasper. Location of types: Holotype male, allotype female, and 3 male 774 The University Science Bulletin and 1 female paratypes labeled "Cochabamba, Bolivia, S. A., March, 1938, A. M. Olalla" in the Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate CXII.) Known to us only by the type series. Sigara ( Tropocorixa) boliviensis Hungerford 1939 (Plate CXI, 3 figures) 1939. Sigara boliviensis Hungerford, H. B. Jl. Kans. Ent. Soc, Vol. XII, No. 3, pp. 97-99, 1 pi. (Bolivia.) Size: Length 5.5 mm. Width across eyes 1.9 mm. Color: General facies light brown. Pronotum crossed by 7 to 8 narrow dark bands, anterior ones interrupted and irregular as to thickness, only the first two bands extending to margins of pronotal disk. Dark pattern of clavus transverse at base, composed of ir- regular, zigzag lines elsewhere. Corial pattern of equally distributed splotches of light and dark arranged in faintly longitudinal series. Corium separated by pale line from membrane which has reticulate pattern. Embolium smoky; head and limbs pale; venter smoky with pale margins. Structural characteristics : Head about two-thirds as long as pro- notal disk ; interocular space equal to or slightly exceeding the width of an eye; vertex slightly produced beyond curve of eyes; face not hairy; male fovea fairly shallow and narrow, not attaining eyes laterally; antennal segmentation: 1 : 2 : 3 : 4 : : 20 : 15 : 32 : 20 J^ . Pronotal disk not reduced, broad laterally, rounded apically; median carina on anterior fourth; pronotum and hemelytra finely rastrate, the latter with scattered pale hairs; pruinose area of em- bolar groove posterior to nodal furrow shorter than that of the claval suture. Lateral lobe of prothorax elongate, sides nearly paral- lel, rounded apically, its anterior angle produced; mesoepimeron narrow with osteole near the tip; metaxyphus about as broad as long, apex blunt. Front leg of male: pala cultrate, faintly carinate on outside, with 24 pegs in a single, slightly curving row midway between dorsal margin and palm; tibia about half as long as pala, with a short dorsal carina and a small, semioval pad; femur rela- tively slender, without stridulatory pegs on inner surface and with ventral margin not produced. Middle and hind legs slender, average segniental proportions : Middle leg: Femur : tibia : tarsus : claw : : 100 : 46.8 : 33.4 : 46.8. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 85.8 : 114.4 : 42.9. Male asymmetry dextral; strigil small, almost round, Western Hemisphere Corixidan 775 of 4 regular combs. Right margin of seventh abdominal segment not produced. For details of male structures see Plate CXI. Comparative notes: This species is very close to T. dita Jacz., but is larger, has a broader interocular space and has the claw of the middle leg equal to the tibia instead of longer. Also, the males of T. dita can stridulate. Location of types: Holotype male labeled '"Colimi, Bolivia, S. A., April, 1938, A. M. Olalla" in the Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate CXII.) Known only Ijy the type. Siga7'a (Tropocorixa) czakii Jaczewski (Plate CIX, figs. 1, la-lg) 1927. Sigara (Sigara) czakii Jaczewski, T. Ann. Zool. Mus. Pol. Hist. Xat. Vl, Xo. 1, pp. 50-53, figs. 19-26. 1928. Arctocorixa czakii, Hungerford, H. B. Bull. Brooklyn Ent. See. XXIII, p. 179, PI. VI, fig. 2. The following description is based upon that of Jaczewski. Size: 5 mm. Color: General facies rather dark. The pronotal disk with fewer pale lines on it than in S. (T.) dita Jaczewski which has 8 to 9. Czakii has 6 to 7 almost regular, narrow, pale transverse lines. The pale pattern of the hcmelytra resemble in general that of S. (T.) dita but the pale markings are narrower and more remotely disposed; some pale transverse lines at the base of the clavus are wider and almost entire. Membranal suture marked by an oblique pale line. Membrane showing rather few zigzag-like pale markings, its apical and outer margins dark. Inner portion of the left membrane pale transparent. Marginal area darkened, at its end the outer margin of the hemelytra is still darker, being again pale about the apical corial angle. The pale pattern of the pronotal disk and of the hem- elytra does not dominate over the dark color. Structural characteristics : Head, when seen from above, equal in length to about four-fifths of the length of the pronotal disk. Fron- tal arch almost equally prominent in both sexes. Facial impression of the male comparatively feeble and shallow, indistinctly limited above. Face almost glabrous in both sexes. Fourth antennal seg- ment equals in length sixty percent of the length of the third. Pro- notal disk slightly shorter than in S. (T.) dita, its length somewhat longer than half of its breadth. Lateral angles rounded. Pronotal keel distinctly visible on the anterior half of the di.sk, posteriorly gradually disappearing. Pronotal disk and base of hemelytra dis- 776 The University Science Billetin tinctly rastrate. Pubescence of hemelytra sparce. Lateral lobe of prothorax tongue-shaped, rounded at apex. Metaxyphus at least as long as broad, blunt at apex with straight lateral margins. Front leg of female of usual shape. Front leg of male: pala cultrate as shown in text figure with 26 to 28 pegs in a row, the terminal ones longei-. Middle leg: femur : tibia : tarsus : claw : : 100 : 50 : 38.8 : 42.9. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 91.4 : 103.4 : 50. On the upper surface of the posterior femur some few isolated short spines. Strigil not very small, nearly round in its outline, with 6 to 7 partly abbreviated and interrupted combs. Right clasper distinctly widened in the terminal part, beneath the end with a small emargination and a tooth just behind it. Left clasper wide. Comparative notes: This species can be distinguished from S. iT.) dita by its shorter pronotal disk with fewer pale lines on it, by the slightly shorter intermediate claws, by the more feeble facial im- pression in the male, by the much larger strigil, and by the shape of the right clasper. Location of type: Described from at least two males and several females from Ponta Grossa, Rio da Areia, Parana, Brazil. Types in the Polish Museum. Data, on distribution: (Plate CIX.) We have studied a single male specimen from Sao Paulo, Brazil, sent us by the Brazil Mu- seum. The following notes may be added to the original descrip- tion: The interocular space is equal to the width of an eye. The head is less than four-fifths the pronotal disk, nearer half that length. The pruinose area beyond the nodal furrow is about half as long as that of the claval suture. The mesoepimeron is narrow with the osteole near its tip. The metaxyphus is jilainly longer than broad. The front tibia of the male with a small pad. Reproductions of Jaczewski's drawings, together with drawings made of the above- mentioned male specimen, may be found on Plate CTX, figs. 1 to Ig. Sigara (Tropocorixa) forciceps (Spinolal* (Plate CX, figs 2, 2;i-2e) 1852. Corixa ft>rric^|>s Spinola, M. IM., in Gay's Histoiia Fiscia y,Piilitii-a de C'hilr, Zuol. VII, p. 23t. 186.3. Corij-a furcU(ps, Signoift, \'. Ann. Soc. Ent. Fi. (Paris), 4 sei. Ill, p. 581. 1879. Coriia forciceps. Berg C. Hem. Arg. Bonariae, H:iinlinig(i. p. 201. (Records ivv.ra Argentina.) * Spinola described this from Chile and as pointed out by Doctor Jaczewski. 11181, our concept of this species is liased upon Berg's asstrtion (1879) that the Argentine specimens he studied are identical with those from Chile. However, we have never seen specimens from Chile of what we here describe, nor can we locate Spinola's type which, according to Walt her Horn, shouhl l)e "im Castelhi rli Tassarolo (Novi Ligure)." Western Hemisphere Corixidan 777 1897. Corixa forctceps, Breddin, G. Erg. Hamb. Mag. Sammelreise Hemiptera. Ham- burg, pp. 15-16, figs. 6, 6a-c. (Redesc.) 1899. Corixa forciceps, Kirkaldy, G. W. Bollettino Musei de Zool. ed Anat. Conip. Univ. di Torino XIV, No. 351. (Records Paraguay and Argentina.) * 1909. Arctocorisa forciceps, Kirkaldy, G. W., and Torre-Bueno, J. R. de la. Catalogue in Proc. Ent. See. Wash. X, p. 195. 1927. Sigara forciceps, Jaczewski, T. Ann. Zool. Musei Polonici Hit^t. Nat. VI, No. 1, p. 58, fig. 36. 1928. Arctocorira forciceps, Hiuigerford, H. B. Bull. Brooklyn Ent. Soc. XXIII, p. 179, PI. VI, fig. 3. 1928. Sigara (Sigara) forciceps, Jaczewski, T. Ann. Musei Nat. Hungarici XX\', p. 214. (Argentina and Paraguay.) 1930. Sigara (Sigara) forciceps. Jaczewski, T. Mitteil. Zool. Staatsinst. und Zool. Mus. Hanib. XLIV, p. 147. 1931. Sigara forciceps, Jaczewski, T. .\nn. Musei Zool. Polonici IX, Nr. 10, p. 151, Tab. XIII, figs. 5 to 9. 1933. Sigara forciceps, Jaczewski, T. Ann. Musei Zool. Polonici IX, Nr. 21, p. 332. (Lists Uruguay.) 1935. Sigara forciceps, De Carlo, J. A. Revista Chilena de Historia Natural, p. 108. (Catalogue.) Size: Length 5 inin. to 6 nini. Width of head across eyes 1.8 mm. to 2 mm. Color: General facies medium to dark. Pronotum crossed by 7 to 8 broad brown bands. Hemelytra dark with flecks of lighter color in faintly transverse series. In some specimens the distal portion of the corium is almost solid brown. Coriiim and mem- brane separated by a pale line. Emboliiim, head, limbs and venter pale. Structural characteristics : Head about two-thirds as long as pro- notal disk; vertex of male conically produced between eyes as seen from above; facial hairs few; infraocular width of the genae at the level of the hypo-ocular suture greater than the diameter of the middle femur; male fovea shallow, broad, but not attaining eyes laterally; interocular space narrower than the width of an eye; antennal segmentation as follows: 1 : 2 : 3 : 4 : : 20 : 14 : 29 : 19 c? ; 1 : 2 : 3 : 4 : : 20 : 14 : 31 : 21 $ . Pronotal disk short compared to width, with faint median carina on anterior third, rounded apically; finely rastrate. Hemelytra nonrastrate, faintly rugulose, with a few pale hairs. Pruinose area of embolar groove posterior to nodal furrow equal to or shorter than the pru- inose area of the claval suture. Lateral lobe of the prothorax almost as broad as long, anterior distal angle produced, posterior angle rounded; mesoepimeron narrow with osteole near tip; meta- xyphus small, broader than long, the apex forming almost a right angle, especially in female. Front leg of female of usual shape. Front leg of male: pala rounded on dorsal surface, cultrate, 30 pegs in an almost straight row; tibia about two-thirds as long as 100 : 38 : 32 : 36. 100 : 89.9 : 119.9 : 778 The University Science Bulletin pala with a short dorsal carina and a pad; femur slender, sides nearly parallel, with about 8 rows of stridulatory pegs on inner sur- face. Middle and hind legs slender; middle femur not armed with stout spines; segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw Hind leg: femur : tibia : tarsus 1 : tarsus 2 46.6. Male asymmetry dextral; strigil large, almost round, with about 7 regular combs. Median lobe of seventh abdominal seg- ment trapezoidal, without a fringe of hairs; right margin of same segment without an angular projection. For details of male pala, abdomen, and genitalia see Plate CX, figs. 2, 2a, 2b, 2c, 2d, and 2e. Comparative notes: Structurally this species is close to T. rehi Jacz. and to T. santiagiensis (Hungfd.). It may be distinguished from the former by the shape of the male right clasper and the shape of the median lobe of the seventh abdominal segment of the male, and from the latter by the two characters already mentioned and the fact that the middle tibia is longer than the tarsal claw instead of being of equal length. Location of types: Spinola's types are reported by Walther Horn to be in the Castello di Tassarolo (Novi Ligure). Data on distribution : (Plate CXII.) We have the following be- fore us: Brazil: Nova Teutonia, Fritz Plauman (Usinger), 4 males, 11 fe- males; nr. Porto Alegre, temp, pools in grasslands, Aug., 1941, H. Kleerekoper, 8 males, 5 females; Alto Parana, Aug. 29, 1929, F. Schade, 1 male, 1 female; Nova Teutonia, Fritz Plauman (Helsing- fors), 11 females. Uruguay: "Sweeping from Montevideo to Salto, S. A.," March 6-14, 1940, H. L. Parker, (Nat. Mus. Coll.), 2 males, 9 females. Paraguay: Villa Rica, July 8, 1924, Loma, F. Schade, 12 males, 20 females; same place and collector (estero en queblo), July 16, 1923, 4 males, 10 females; same place and collector, Jan. 7, 1923, 4 males, 2 females; same place and collector, Sept. 24, 1924, 1 male, 4 females; same place and collector, Dec. 16, 1924, 1 male; same place and collector, Oct. 30, 1923, 6 males, 7 females; same place and collector, Nov. 4, 1923, 5 males, 12 females; same place and collector, Nov. 10, 1923, 1 female; same place and collector, Aug. 2, 1924, 3 females; same place and collector, Dec. 20, 1924, 1 female; same place and collector, Dec. 18, 1924, 5 females; same place and Western Hemisphere Corixidan 779 collector, Jan. 15, 1925, 2 females; same place and collector, Dec. 15, 1923, 5 males, 25 females; same place and collector, Aug. 8, 1924, 1 male; same place and collector, Oct. 30, 1924, 3 females; same place and collector, Oct. 29, 1929, 5 males, 6 females; Molin- esque, June 20, 1935, same collector, 1 male, 4 females; Villa Rica, Sept. 20, 1925, same collector (Helsingfors), 1 male, 2 females; Horqueta, Dec. 7, 1934, Alberto Schulzc. 1 male (Drake Coll.) ; Caraveni, Oct. 30, 1924, Francisco Schade, 6 males, 7 females; same place and collector, Dec. 18, 1924, 1 female. Argentina: Center of City of Buenos Aires, Carlos Reed, 14 males, 242 females; Tigre, B. A., Nov. 20, 1938, C. J. Drake, 1 male, 16 females (Drake Coll.) ; Buenos Aires, Nov. 23, 1938, same col- lector and collection, 9 females; Lujan, B. A., Dec. 18, 1938, same collector and collection, 3 males, 5 females. Sigara {Tropocorixa) rehi Jaczewski 1930 (Plate CX, figs. 3, 3a and 3b after Jaczewski) 1930. Sigara rehi Jaczewski, T. Pub. of Zool. Staatsinstitut Zool. Mus., Hamburg, 44, pp. 147-148. (Argentina.) The following information is taken from Doctor Jaczewski's German description: Size: 5.5 mm. long. Color: General facies dark brown. Pronotum with 6 to 7 moder- ately regular pale yellow bands. Head, limbs, and venter yellow. Eyes dark. Structural characteristics : Head about two-thirds as long as pro- notal disk; vertex, seen from above, wdder than an eye; face sparsely haired; male fovea rather deep and wide, but not attaining eyes laterally. Pronotum plainly rastrate, four-tenths wider than long, hemelytra smooth, shining; few hairs on hemelytra. Lateral lobe of prothorax ligulate, end rounded; metaxyphus short, tip blunt, lateral margins straight. Foreleg of male: pala rather small, cultrate, inner margin with 18 sieve hairs, stridulatory row of 25 pegs, smaller at base. Tibia toward the end three-edged, without a pad. Femur with a small field of thickened hairs on its front surface. Middle claw clearly longer than its tarsus. Male asymmetry dextral, strigil round, of 6 somewhat irregular combs. Middle lobe of seventh abdominal segment triangular, somewhat broad. Right genital clasper relatively narrow. (See drawing.) Tip of ninth segment simple, flaps of penial sheath anchor-like. For details of 780 The University Science Bulletin male pala, abdomen, and right clasper see Plate CX, figs. 3, 3a and 3b. (Drawn after Jaczewski.) Comparative notes: T. rehi Jacz. may be distinguished from all other S. A. Tropocorixa, except T. forciceps (Si)in.l, by the shape of the right genital clasper. It may be separated from S. (7".) jorciceps (Spin.) by its small hy])o-ocular space and the lighter color of its venter. Location of types: Holotype male, "Buenos Aires, Fr. Beumer 1 male," in Hamburg State Institute of Zoology and Zoology ]Museum, Hamburg, Germany. (See Plate CXII.) Sigara i Tropocorixa) termasensis (Hungerford) (Plate CVin, fifrs. 4. 4a-4c) 1928. Arctocorixa fazi var. termasensis Hunyci toid. H. B. Bull. Bronklyn Ent. Soc, XXIII, p. 178, PI. VII, figs. 7 and 10 (Chile). 1933. Siyara termasensis, Jaczewski, T. Ann. .Mus. Zool. Pol., Tom. IX. Nr. -21. p. 332. (Raised to specific rank.) 1935. Siyara termasensis, De Carlo, Jose A. Revista Chilena de Histoiia Xatural, p. lOh and 109. (Systematized catalog.) Size: Length 5.7 mm. to 5.9 mm. Width of head 2 mm. to 2.1 mm. Color: General facies medium. Pronotum crossed by 7 or 8 fairly regular brown lines, narrower than pale interspaces. Hemelytra not cross-banded, except at base of chn-us. Brown pigment of corium occasionally in faintly longitudinal series; pattern venniculate. Em- bolium, head, and limbs pale. Thoracic venter suffused with l^rown; abdominal venter pale. Structural characteristics : Head about half as long as pronotal disk; vertex rounded out beyond margin of eyes as seen from above; interocular space less than the width of an eye; facial hairs few; male fovea narrow but deeper than in trimacidata (Le G.i ; antennal segmentation: 1 : 2 : 3 : 4 : : 22 : 15 : 37 : 28 males; 1:2:3: 4 :: 22 : 16 : 40 : 27 females. Pronotal disk reduced laterally; carina visible on anterior third; })ronotum and hemelytra finely rastrate, the latter with a few pale hairs. Pruinose area of embolar groove posterior to nodal furrow shorter than the pruinose area of the claval suture. Lateral lobe of prothorax elongate, rounded apically, sides parallel; mesoepimeron narrow with osteole near tip; metaxy- phus broader than long, narrowly rounded at tip. Front leg of female of usual shape. Front leg of male: Pala rounded on dorsal margin, cultrate, with a small tubercle on dorsum near base, about 25 pegs in an almost straight row; tibia about half as long as pala with a short dorsal carina and no pad; femur slender, .ki, T. Mittt-il. aus dein Zool. Staatsinstitut iind Zool. Mus. in Hamb., XLIV, p. 147 (Parana, Brazil). Size: Length 4.2 mm. to 5.4 mm. Width of head across eyes 1.5 mm. to 1.8 mm. Color: General facies medium to dark. Pronotum crossed by 7 to 9 fairly regular dark bands usually wider than pale interspaces. Base of clavus with ])roken, transverse bands. Pattern elsewhere irregular, broken into about equal distribution of light and dark areas. Alembrane and corium separated by pale line. Embolium smoky. Head, limbs, and venter pale. Strvctural characteristics: Head about two-thirds as long as pro- notal disk; smoothly rounded across vertex as seen from above; facial hairs few; infraocular width of genae at level of the hypo- ocular suture less than the diameter of the middle femur; male fovea distinct, shallow, not attaining eyes laterally; interocular .space less than the width of an eye; antennal segmentation as follows: 1:2: 3 : 4 : : 21 : 12 : 29 : 21 J ; 1 : 2 : 3 : 4 : : 20 : 12 : 30 : 22 $ . 790 The University Science Bulletin Pronotal disk with median carina plain on anterior third and visible on most of the length of the disk; finely rastrate; rounded apically. Hemelytra faintly rastrate to riigulose, covered with fine pale hairs ; membrane shining. Pruinose area of embolar groove posterior to nodal furrow shorter than the pruinose area of the claval suture. Lateral lobe of prothorax elongate, rounded apically; mesoepimeron narrow with osteole near the tip; metaxyphus broader than long, rounded apically. Front leg of female of usual shape. Front leg of male: pala cultrate, 24 to 30 pegs in an undulate curved row,* those at base shorter and more rounded than distal ones ; tibia about two- thirds as long as pala, slender with short dorsal carina and a small pad ; femur slender with sides nearly parallel, 9 rows of small stridu- latory pegs on inner surface. Middle and hind legs slender; middle femur not armed with stotit spines; segmental proportions as fol- lows: Middle leg: femur : tibia : tarsus : claw : : 100 : 45.6 : 36.9 : 47.4. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 89.9 : 116.6 : 42.3.t Male asymmetry dextral; strigil small, suboval, 3 or 4 regular combs, located at end of short pedicel. Right margin of seventh abdominal segment not triangularly produced. For details of male pala. abdomen, and genitalia see Plate CVIII, figs. 1, la, lb and Ic. Comparative notes: This appears to be our smallest South Ameri- can species with a strigil. Location of types: Polish Museum of Natural History, Warsaw, and four paratypes, "Rio do Areia, III, 25, 1922, Parana, Brazil, P. E. Z., T. Jaczewski" in the Francis Huntington Snow Entomo- logical Collections, University of Kansas. Data on distribution: (Plate CXH.) Brazil: Campinas Estado do Sao Paulo, March 10, 1924, F. X. Williams, 2 males; Nova Teutonia, Fritz Plauman (Usinger) ; Re- sistencia, Chaco, to Santiago del Estero, April 4-9, 1940, D. M. Cochran (U. S. N. M. Coll.) , 1 female. Argentina: Pico, Sept. 9, 1940 (U. S. N. M. Coll.), 1 female. Sigara (Tropocorixa) egbertw n. sp. (Plate CVII, figs. 2, 2a-2c) Size: Length 5.9 mm. Width of head across the eyes 1.9 mm. Color: General" facies medium brown. Pronotum crossed by 5 or 6 brown bands that are a little broader than pale interspaces. * Not sliowi) in my drawing on Plate CVIII, tig. 1. t Jaczewski gives: Middle leg: 100 : 49.6 : 35.9 : 45.4; Hind leg: 100 : 95.2 : 108.4 : 51.3. Western Hemisphere Corixidan 791 Clavus crossed by dark bands, a little wider than interspaces, some of them furcate. Corial markings more broken and irregular but transverse. The figures coarser than in S. (T.) czakii Jaczewski. Corium and membrane faintly separated by a pale line but of same pattern. Embolium pale. Venter with basal abdominal segments dark. Structural characteristics: Head about two-thirds as long as pro- notal disk; vertex rounded out beyond the margins of eyes as seen from above. Interocular space a little less than the width of an eye. Infraocular width of genae at level of the hypo-ocular suture less than the diameter of the middle femur; facial hairs few; male fovea broad, shallow, poorly defined. Pronotal disk with median carina visible on anterior third; lateral margins rounded; apex angulate. Pronotum and hemelytra moderately rastrate. Pruinose area of embolar groove posterior to nodal furrow shorter than pru- inose area of claval suture. Lateral lobe of prothorax elongate, sides nearly parallel, rounded apically. Mesoepimeron narrow with osteole near the tip. Metaxyphus broader than long, bluntly rounded apically. Front leg of male: pala cultrate, long and nar- row, 32 pegs in almost a straight row; tibia about half as long as pala, large and rounded; short dorsal carina, terminating apically in a pad; femur slender, sides almost parallel, with about ten rows of stridulatory pegs on inner surface. Middle and hind legs slender; middle femur not armed with stout spines; segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw :: 100 : 48.2 : 33.9 : 48.2. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 100 : ? : ?. Male asymmetry dextral; strigil elongate, oval, of 4 regular combs. Median lobe of seventh abdominal segment large and rather long; right margin of same segment as shown in figure 2c on Plate CVII. For details of male pala, abdomen and genitalia see Plate CVH, figs. 2, 2a, 2b and 2c. Comparative notes: This species is close to S. (T.) termasensis (Hunger ford) from which it may be separated by several characters better than by the right clasper of the male which is very similar in these species. The pronotal disk is not laterally reduced as it is in S. (T.) termasensis. Location of type: Described from a single male labeled "Bari- loche, Rio Nigro, Terr. Arg., R. B. Vereertbrugghen." This is in the Francis Huntington Snow Entomological Collections, Univer- sity of Kansas. Data on distribution: (Plate CXII.) Known only by the type. 792 The University Science Bvlletin Sigara iTropocorixa) chrostowskii Jaczewski (Plate CVI, figs. 2, 23-20) 1927. Sigara (Sigara) chrostowskii Jaczewski, T. Ann. Zool. Mus. Pol. Hist. Nat., T. \'I, No. 1, pp. 40, 41. 42-46, figs. 1-9; PI. II, fig. 1 (Parana, Argentina). 1928. Arctocorixa chrostowskii, Hungerford, H. B. Btill. Brooklyn Ent. Soc. XXIII, p. 179. PI. VI. fig. 7. 1928. Sigara (Sigara) chrostoivskli, Jaczew.ski, T. Ann. Mu.s. Nat. Hung.. Vol. XXV, p. 214. 1929. Sigara (S.) chrostowskii. Lundblad, O. Zoologischer Anzeiger. Bd. 80, Heft 7/9, pp. 197-200, figs. 6-11. 1930. Sigara chrostowskii, Jaczewski, T. Mitteil. aiis dem Zool. Staatsinst. iind Zool, Mus. Hamb., Bd. 44, p. 147 (Brazil). 1933. Sigara (Sigara) chrostowskii, Jaczewski. T. Ann. Mus. Zool. Pol., Vol. IX. 21, p. 333 (Brazil). Size: Length 5.25 mm. to 6.3 mm. Width of head across eyes 1.8 mm. to 2 mm. Color: General facies medium to dark. Pronotum crossed by 7 to 8 broad, regidar brown bands. Hemelytral pattern reticulate in somewhat longitudinal series. Membrane and corium separated by a pale line. Embolium smoky. Head, limbs and venter pale. Structural characteristics: Head about two-thirds as long as pro- notal disk;* vertex slightly produced in both sexes; interocular space slightly narrower than the width of an eye; infraocular width of genae at level of the hypo-ocular suture less than the diameter of the middle femur; facial hairs few; male fovea shallow, not at- taining eyes laterally; antennal segmentation: 1 : 2 : 3 : 4 : ; 20 : 18 : 30 : 25 cj ; 1 : 2 : 3 : 4 : : 20 : 16 : 33 : 28 5 . Pronotal disk about two-thirds as long as wide, faint indication of median carina visible on anterior third; pronotum faintly rastrate, heraelytra smooth, .sliining, with a few pale hairs. Postnodal pruinose area shorter than tliat of the claval suture. Pleural region slightly in- flated. Lateral lobe of prothorax narrow, about half as broad at base as long, rounded apically; mesoepimeron narrow with osteole near its tip; metaxyphus broader than long, rounded apically. Front leg of female of usual shape. Front leg of male: pala cul- trate, the sides almost parallel, about 26 pegs (24-311 in a single, almost straight row, small at base, larger and longer apically; tibia about half as long as pala, dorsal carina extending almost to base, with a pad; femui' slender, with 8 to 12 rows of stridulatory pegs on inner surface, surrounded by fine luiiis. Middle and hind legs slender; segmentation: Middle leg: femur : tibia : tarsus : claw :: 100 : 51.5 : 37.2 : 48.6. Hind leg: femur : tibia : tarsus 1 : tar- * Jaczewski says male head about five-sixths, female head four-sevenths of pronotal disk but in specimens hr- sent us the head is not so long. Western Hemisphere Corixidan 793 sus 2 :: TOO : 92.8 : 123.8 : 42.4.t Male asymmetry dextral; strigil small, round, of 5 fairly regular combs. Right margin of seventh abdominal segment triangularly produced. Right clasper of genital capsule with 3 to 7 toothlike serrations on a lobe before the tip. For details of male abdomen, pala and genitalia see Plate CVI, figs. 2, 2a, 2b and 2c. Comparative notes: Males of this species may be distinguished by having the right clasper with a serrated lobe before the tip. In this character it also resembles S. [T.) townsendi Hungfd. from which it may be distinguished by its larger size. Location of types: Polish Museum of Natural History, Warsaw, and paratypes in the Francis Huntington Snow Entomological Col- lections. University of Kansas. Data on distribution: (PlateCXII.) Brazil: Sao Paulo, Ovt., 1935, via A. M. Olalla, 6 males, 2 fe- males; same place, May, 1927, E. D. Townsend, 11 males, 32 fe- males; same place and collector, Aug. 7, 1927, 11 males, 30 females; same place, Roberto Spitz, 6 males, 10 females; Itanhaem, same collector, July, 1925, 5 males, 10 females; Estado de Sao Paulo, 4 males, 25 females; Sao Domingo, Parana, P. E. Z., Feb. 18, 1922 (det. Jaczewski), 2 males, 3 females (on one pin) ; nr. Porto Alegre, temp, pools on grassland, Aug., 1941, H. Kleerekoper, 13 males, 55 females; Itaquaquecetuba, July, 1933, W. 0. Townsend, 2 males, 5 females; same place, via Poa EFCB est de Sao Paulo, E. D. Town- send, 48 males, 184 females; same place and collector, 1931, 240 males. 266 females; Nova Teutonia, Fritz Plauman (Usinger) ; Japura (River) Catandura, W. F. A., via Oscar Monte, 1 male, 1 female. Paragl'ay: Villa Rica, Estero Grande, Francisco Schade, 2 males, 3 females; same place and collector, Oct. 30, 1924, 4 males, 12 fe- males; Caraveni, Oct. 30, 1924, same collector, 3 males, 10 females; Hape, Nov. 20, 1924, same collector, 4 males, 2 females; Villa Rica, Dec. 16, 1924, same collector, 2 males, 2 females. Argentina: Paranacito, Prov. de Entre Rios, 10 males, 8 females; Buenos Aires, Nov. 23, 1938, C. J. Drake, 1 male, 2 females. t Jaczewski gives: Middle leg: 100 : 46.2 : 33.2 : 44.4; Hind leg: 100 : 94.1 : 109.8 : 49.8. 794 The University Science Billetin Sigara (Tropocorixa) brachypala (Hungerford I (Plate CVI, figs. 1, la-lc) 1928. Arctocorixa chrostowskii var. brachypala Hungerford, H. B. Bull. Brooklyn Ent. Soc, Vol. XXIII, p. 177, PI. Vll, figs. 3 and 6. (Sao Paulo, Brazil.) Size: Length 5.5 mm. Width of head across eyes 1.8 mm. Color: General facies medium; lighter than S. (T.) chrostowskii Jacz. Pronotiim crossed by 7 regular brown bands, slightly broader than pale interspaces. Hemelytral pattern reticulate in somewhat longitudinal series ; slight tendency for brown areas to coalesce along inner apical angle of corium. Embolium smoky. Corium and membrane separated by a pale line. Head, limbs and venter pale. Structural characteristics : Head two-thirds as long as pronotal disk; vertex not produced as seen from above; interocular space slightly less than the width of an eye. Infraocular width of the genae at the level of the hypo-ocular suture less than the diameter of the middle femur; facial hairs few; male fovea shallow; anten- nal segmentation as follows: 1 : 2 : 3 : 4 : : 18 : 16 : 30 : 28 ^ . Pronotal disk a little more than half as long as broad, median carina hardly visible on anterior fourth; pronotum rugulose; hem- elytra smooth, shining, with a few pale hairs. Postnodal pruinose area shorter than that of the claval suture. Lateral lobe of pro- thorax half as broad at base as long, tip obliquely truncate; meso- epimeron narrow with osteole near tip; metaxyphus broader than long, tip rounded. Pleural region slightly inflated. Front leg of male: pala cultrate with a small tubercle or carina at base on dorsal surface, pala short and broad, strongly curved in at tip, about 28 pegs in a slightly curved row; tibia about two-thirds as long as pala, short dorsal carina, and a small pad; femur slender with about ten rows of stridulatory pegs on inner surface, margins nearly parallel. Middle and hind legs slender; middle femur not armed with stout spines; segmental proportions as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 43.8 : 31.5 : 43.8. Hind leg: femur : tibia : tarsus 1 : tarsus 2 : : 100 : 60.1 : 108.7 : 27.2. Male asymmetry dextral, strigil oval, of 5 rows of regular combs, located at end of a triangular projection of sixth abdominal seg- ment. Right margin of seventh abdominal segment with a small, sharp triangular projection. Right clasper of genital capsule ser- rate along dorsal surface near tip. For details of male pala, ab- domen, and genitalia see Plate CVI, figs. 1, la, lb, and Ic. Comparative notes: This species is closely allied to S. (T.) chrostowskii Jacz. from which it may be distinguished by the short, Western Hemisphere Corixidan 795 broad pala of the male, by having the strigil at the end of a tri- angular plate. Location of types: Holotypc male labeled "Sao Paulo, Brazil, May, 1927, E. D. Townsend," in the Francis Huntington Snow En- tomological Collections, University of Kansas. Although I de- scribed this as a variety of &. chrostowskii Jacz., it comes from the same place and must be recognized as a sibling species or else only within the range of variation of *S. (T.) chrostowskii. The type is slightly tencral. Data on distrib^dion: (Plate CXII.) Known only by the type. Sigara { Tropocorixa) toivnsendi (Hungerford) (Plate CVI, figs. 3, 3a-3c) 1928. ArctocorUa clirostowskii var. townsendi Hungerford, H. B. Bull. Brooklyn Ent. Soc, Vol. XXIII, p. 177, PI. VII, figs. 4-5 (Sao Paulo, Brazil). Size: Length 5.1 mm. to 5.9 mm. AVidth of head across eyes 1.7 mm. to 2 mm. Color: General facies medium to dark, a little darker than S. (T.) chrostowskii (Jacz.). Pronotum crossed by 6 or 7 regular, dark bands, a little broader than pale interspaces. Hemelytral pattern with pale figures broken, furcate or vermiculate. Membrane and corium separated by a pale line. Head, limbs, venter and embolium pale. Structural characteristics: Head about three-fourths as long as the pronotal disk, the vertex rounded out beyond eyes as seen from above ; interocular space less than the width of an eye ; infraocular width of genae at level of the hypo-ocular suture less than the diameter of the middle femur; facial hairs few; male fovea shallow, broad, not quite attaining eyes laterally; antennal segmentation as follows: 1 : 2 : 3 : 4 : : 16 : 14 : 33 : 32 j^ . Pronotal disk about two-thirds as long as wide, pointed apically, median carina faintly visible on anterior fourth. Pronotum finely rastrate, hemelytra smooth, shining, with a few pale hairs. Pruinose area of the em- bolar groove posterior to the nodal furrow shorter than that of the claval suture. Lateral lobe of prothorax slender, half as wide at base as long, anterior distal angle produced. Mesoepimeron slender, osteole near tip. Metaxyphus broader than long, bluntly rounded apically. Front leg of female of usual shape. Front leg of male: pala cultrate, 25 pegs in slightly curved row, with a small carina on dorsal margin near junction with tibia, upper palmar row of bristles crowded basally, further apart and larger distally; tibia 796 The University Science Bulletin about t^Yo-thil■ds as long as pala, with short dorsal carina, and no pad ; femur slender with 10-12 rows of stridulatory pegs on its inner surface. Middle and hind legs slender; relation of segment to seg- ment as follows: ^Middle leg: femur : tibia : tarsus : claw :: 100 : 43.2 : 29.9 : 39.8. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 89.9 : 119.9 : 46.6. Male asymmetry dextral, strigil small, suboval in shape, of 5 regular combs. Right margin of seventh abdominal segment with markedly produced triangular lobe. Right clasper similar to that of T. chrostowskii fJacz.l, but with more serrations near the tip. For details of male structures see Plate CVI, figs. 3, 3a, 3b and 3c. Comparative notes: This species is very closely allied to chro- stowskii Jacz. but is a little darker in color, has more ]irocesses on the right clasper, and the lobe of the right margin of the seventh abdominal segment of the male is more jironounced. Originally described as a variety of 8. chrostoirskii Jacz. but really is a sibling species. Location of types: Holotype male, labeled "Sao Paulo, Brazil, S. A., May, 1927, E. D. Townsend," in the Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate CXII.) Known only by the type. Sigara iTropocorixa) denseconscriptoidra I Hungerfordi (Plate ex, figs. .5. 5a-5c) 192S. Arctocorixa clenseconscriptoidea Hiingerfoid, H. R. Bull. Rrnoklyn Knt. Snc, .XXIII, p. 176-177, PI. VI. fig. 10. (Sao Paulo, Brazil.) 1929. Sif/ara bahieiisis Lundblad, 0. Ent. :MMl(li'lclspr, X\T, pi). 2(11-294. PI. Ill, fig.s. 14-18. 1930. Sigara denseconscriptoidea, Jaczewski, T. Mitlcil. aus. (U-ui Zool. Staatsinst, und Zool. Mus., Hamburg XLIV, p. 147. (Brazil.) (Says S. hnhieiisis Lundblad is syn.) 1933. Sigara dctiseconitcriptoidea, .Jaczewski, T. Ann. Mus. Zool. Pol., Tom. IX. Xr. 21, p. 333. (Brazil.) Size: Length 5.7 mm. to 6.1 mm. AVidth of head across eyes 1.8 mm. to 1.9 mm. Color: General facies medium, color pattern distinct. Pronotum crossed by 7 regular brown bands, no wider tlian pale interspaces. Base of clavus with broken more or less transverse bands. Pattern elsewhere wavy and broken, m faintly longitudinal series. Em- bolium, head, limbs, and venter pale. Structural characteristics: Head about two-thirds as long as pro- notal disk; males with vertex conically jiroduced as seen from above; interocular space less than the width of an eye; facial hairs few; male fovea deep, narrow, and well defined; antennal segmentation Western Hemisphere Corixidan 797 as follows: 1 : 2 : 3 : 4 : : 23 : 14 : 36 : 23 j ; 1 : 2 : 3 : 4 : : 23 : 14 : 34 : 23 5 . Pronotal disk rounded behind, about half as long as broad, finely rastrate, and with median longitudinal carina vis- ible on anterior third; hemelytra nonrastrate, shining, with a few pale hairs. Pruinose area of embolar groove posterior to nodal fur- row shorter than the pruinose area of the claval suture. Lateral lobe of prothorax about half as broad as long, rounded apically; mesocpimeron narrow with osteole near tip; metaxyphus about as long as broad, rounded apically. Front leg of female of usual shape. Front leg of male: pala cultrate, longitudinally carinate on outside, 23 pegs arranged in a curved row; tibia about half as long as pala. rather broad, with a short dorsal carina terminating distally in a round pad; fcnuir slender, with about 10 rows of stridulatory pegs on inner surface. Middle and hind legs slender; middle femur not armed with stout spines; proportion of segments as follows: Middle leg: femur : tibia : tarsus : claw : : 100 : 48.1 : 33.6 : 51.8. Hind leg: femur : tibia : tarsus 1 : tarsus 2 :: 100 : 77 8 : 105.8 : 42.9. Male asymmetry dextral; strigil small, of about 4 to 5 rows of regular combs, located at tip of a short pedicel. Right margin of seventh abdominal segment with a triangular projection. For de- tails of male pala. abdomen, and genital capsule see Plate CX, figs. 5, 5a, 5b and 5c. Comparative notes: This species may be distinguished from others of the group by having the head of the male more conically produced and by having the middle tibia shorter than its tarsal claw. Location of types: Described from 21 specimens taken at Sao Paulo and Itanhaem, Brazil, by Roberto'Spitz. Holotype male (Sao Paulo), allotype female (Itanhaem), 5 male and 14 female para- types. Holotype. allotype and some paratypes in the Francis Hunt- ing-ton Snow Collection, University of Kansas; others in the British Museum and the Polish Museum. Types of S. bahiensis Lundblad in the Copenhagen Museum. Data on distribution: (Plate CXII.) Br.\zil: Espiritu Santo, Coll. Breddin, 1 male. Argentina: Resistencia, Chaco, to Santiago del Estero, April 4-9, ]940. H. L. Parker (U. S. N. ]\I.), 2 females. 798 The University Science Bulletin Sigara (Tropocorixa) argentiniensis n. sp. (Plate CVIII, figs. 2, 2a-2d) Size: Length 5.5 mm. Width of head across eyes 1.8 mm. Color: General facies medium. Pronotmri crossed by 6 or 7 dark, regular bands, about as broad as pale spaces. Clavus cross-banded at base. Pattern elsewhere with dark color dominant over light, and arranged in irregularly transverse series. Embolium, head, limbs, and venter pale. Structural characteristics: Head about two-thirds as long as pro- notal disk; vertex rounded as seen from above; interocular space less than the width of an eye; male fovea broad, shallow, not attaining eyes laterally, and with a short median carina at upper margin; facial hairs scanty; antennal segmentation as follows: 1:2:3: 4 : : 19 : 14 : 30 : 19 ^ . Pronotal disk with a faint median carina visible on anterior third; rounded apically; pronotum and hemelytra nonrastrate, faintly rugulose. Pruinose area of embolar groove posterior to nodal furrow shorter than the pruinose area of the claval suture. Lateral lobe of the prothorax about half as broad at base as long, sides nearly parallel, apex rounded; mesoepimeron narrow with osteole near tip; metaxyphus broader than long, pointed apically. Front leg of male: pala cultrate with transverse carina near base on dorsal margin, 26 pegs in a curved row; tibia about half as long as pala, with a sharp dorsal carina extending from base to apex, terminating in a round pad with a cuplike depression; femur slender, sides nearly parallel, with 9 to 10 rows of stridula- tory pegs on inner surface. Middle leg slender; middle femur not armed with stout spines; hind leg missing; segmental proportions of middle leg: femur : tibia : tarsus : claw : : 100 : 43 : 31.9 : 39.6. Male asymmetry dextral; strigil of moderate size, oval, of about 10 regular combs. Median lobe of seventh abdominal segment rounded; right margin of same segment smoothly curved, without triangular projection. For details of male pala, abdomen and genitalia see Plate CVIII, figs. 2, 2a, 2b, 2c, and 2d. Comparative notes: Structurally this species seems closest to T. dita Jacz. and T. santiagiensis (Hungfd.). It differs from the former in being larger and in having the tibia of the middle leg longer than the tarsal claw whereas in dita Jacz. it is shorter. It differs from santiagiensis (Hungfd.) in having the right margin of the seventh abdominal segment of the male smoothly rounded, whereas the other species has a triangular projection. Western Hemisphere Corixidan 799 Location of type: Described from one male specimen formerly labeled A. hosfordce (Himgerford), taken "Buenos Aires, Mercedes, Nov. 19, 1923, Ruby Hosford." In the Francis Huntington Snow Entomological Collections, University of Kansas. Data on distribution: (Plate CXH.) Known to us only by the type. 800 The University Science Bulletin PLATE CV Sigara Tropocorixa Hutchinson Fig. 1. Sigara (Tropocorixa) joiscn-haanipi Jaczcwski; dorsal view of male abdomon. Fig. la. Head of male. Fig. lb. Pala of male (after Jaczewski). Fig. Ic. Genital capsule of male. Fig. 2. Sigara {Tropocorixa) lutngcrjordi Jaczcwski; dorsal view of male abdomen. Fig. 2a. Pala of male. Fig. 2b. Head of male. Fig. 2c. Cenital capsule of male. Fig. 3. Sigara (Tropocorixa) braziliensis n. sp.; dorsal view of male ab- domen. Fig. 3a. Head of male. Fig. 3b. Pala of male. Fig. 3c. Genital capsule of male. Western Hemisphere Corixidan 801 PLATE CV 3 T ^^o^'''e15's n sp TROPOCORIXA HUTCH 51—822 802 The University Science Bulletin PLATE CVI Sigara Tropocorixa Hutchinson Fig. 1. Sigara (Tropocorixa) brachypala (Hungerford) ; pala of male. Fio. la. Genital capsule of male. Fig. lb. Head of male. Fig. Ic. Dorsal view of male abdomen. Fig. 2. Sigara {Tropocorixa) chrosioivskii Jaczewski; pala of male. Fig. 2a. Genital capsule of male. Fig. 2b. Head of male. Fig. 2o. Dorsal view of male abdomen. Fig. 3. Sigara (Tropocorixa) toivrisendi (Hungerford); pala of male. Fig. 3a. Genital capsule of male. Fig. 3b. Head of male. Fig. 3c. Doisal view of male abdomen. Fig. 4. Sigara (Tropocorixa) schadci (Hungerford); genital capsule of male. Fig. 4a. Right clasper, showing variation. Fig. 4b. Head of male. Fig. 4c. Pala of male. Fig. 4d. Dorsal view of male abdomen. Western Hemisphere Corixidan 803 PLATE CVI 02;^ 4 T schadei {Hungta) TROPOCORiXA HUTCH. 804 The University Science Bulletin PLATE CVII Sigara Tropocorixa Hutchinson Fig. 1. Sigara {Tropocorixa) rubyce (Hungerford) ; pala of male. Fig. la. Head of male. Fig. lb. Genital capsule of male. Fig. Ic. Dorsal view of male abdomen. Fig. 2. Sigara {Tropocorixa) cgbertoe n. sp.; pala of male. Fig. 2a. Head of male. Fig. 2b. Genital capsule of male. Fig. 2c. Dorsal view of male abdomen. Fig. 3. Sigara {Tropocorixa) trirnaculata (Le Guillou) \=fazi (Hunger- ford)] ; pala of male. Fig. 3a. Head of male. Fig. 3b. Genital capsule of male. Fig. 3c. Dorsal view of male abdomen. Western Hemisphere Corixidan 805 PLATE CVII ubyde (Hungftj) 2 T egbertd^ n sp TROPOCOmXA HUTCH. 806 The University Science Bulletin PLATE CVIII Sigara Tropocorixa Hutchinson Fig. 1. Sigara (Tropocorixa) dila Jaczewski; pala of male. Pegs should have been shown in an undulate curved row. Fig. la. Head of male. Fig. lb. Genital capsule of male. Fig. Ic. Dorsal view of male abdomen. Fig. 2. Sigara (Tropocorixa) argcntiniensis n. sp.; pala of male. Fig. 2a. Head of male. Fig. 2b. Genital capsule of male. Fig. 2c. Dorsal view of male abdomen. Fig. 2d. Dorsal view of male pala. Fig. 3. Sigara (Tropocorixa) santiagiey\sis (Hvmgerford) ; pala of male. Fig. 3a. Head of male. Fig. 3b. Genital capsule of male. Fig. 3c. Dorsal view of male abdomen. Fig. 4. Sigara (Tropocorixa) (ermnsc)i.' (Hiingerford) (Sigara) 691 viuriUoi n. >p. (Xcofflgaift) 433 N )ifiifi.-< (Kirkaldy) {Trichocorixa) 335 liana Walley (Palmacorixa) 249 nana wallcyi n. subsp. {Palmaconxa) 251 NEOCORIXA Hungerford 150 NEOSIGARA Lundblad 429 nigra Hungerford (Heterocorixa) 126 nigripennis (Fabricius) (Centrocorisa) 437 nitirin (Fieber) (Hcsperocorixa) 539 * niiida minor (Abbott) (Hesperocorixa) 514 * jioorvikensis Hungerford iCallicorixa) 477 * norchnrac< nsif! (Gmelin) (.Sigara) 645 O obliqua (Hungerford) (Hesperocorixa) 543 ocotIa)irnd.i (Jaezewski) ( Pseud ocorixa) 416 omani (Hungerford) (Sigara) 701 orinococnsis n. sp. (Trichocorixa) 339 ornala (Abbott) (Sigara) ... 631 P PALMACORIXA Abbott 242 paludata Hungerford (Sigara) 749 t PARASIGARA Poisson (Sigara) 197 * parshleyi (Abbott) (Sigara) 654 parvula (Champion) ( Trichoconxa) 341 pectenata (Abbott) (Sigara) 705 PEDIOSIGARA n. subg. (Sigara) 638 penniensis (Hungerford) (Sigara) 620 peruana Jaczew.ski ( EctemnostegeUa) 214 PHAEOSIGAR A n. subg. (Sigara) 725 l>icta Hungerford (Neocorixa) 153 PILEOSIGARA n. subg. (Sigara) 634 pilosajrons n. sp. (EctemnostegeUa) 215 planijro7is (Kirby) (Arctocorisa) 601 t powcri (D. & S.) (Micronecta) 13 t pracusla (Fieber) (Calliconxa) 48, 479 producta noorvikensis Hungerford (Calliconxa) 477 t producta producta (Renter) (Callicorixa) 475 t producta sackalinensis (Matsumara) (Callicorixa) 473 t promontoria (Distant) (Sigara Tropocorixa) 764 t propinqua (Fieber) (Glaenocorisa) 48, 138 *t propinciua. camjrons Thomson (Glaenocorisa) 48. 138 PSEUDOCORIXA Jaezewski 408 t PSEUDOGLAENOCORISA Jaezewski 52 Index 825 PAGE * pulchra (Blatchley) (Trichocorixa) 332 pulchrd Hungerford (Tcnagobia) 71 t punctala llliger {Corixa) 44 * pygmnea (Fieber) (Trichocorixa) 358 ' Q quadratn (Signorel) (Eclemnostega) 200 qiiadrata (Walley) (Glaenoconsa) 139 qucbccensis (Walloy) (Sigara) 738 . R RAMPHOCORIXA Abbott 448 rawso7ii n. sp. (Dasyporixa) 145 rehi. Jaczewski (Sigara) 779 * rcinJtardli Lundblad (Helcrocorixa) 126 reticulata (G.-M.) ( Trichocorixa) 343 t RETROCORIXA Walton 197, 610 robcrti n. sp. (Sigara) 783 robust a Hungerford (Graplocorixa) 159 t rogcnhofcri (Fieber) (Cymatia) 103 romani Lundblad (Tcnagobia) 61 rotitndocephala Hungerford (Ramphocorixa) 452 rubya- (Hungerford) (Sigara) 765 * rubyce schadci (Hungerford) (Sigara) 769 ruina Hungerford (Graptocorixa) 158 S * sackaline7isis (Matsumara) (Callicorixa) 473 t s(dilbcrgi (Fieber) (Hcspcrocorixa) 50 SAXDALIORRHYNCHA Borner 16 nanliagivusi.'^ (Hungerford) (Sigara) 788 scabm (Abbott) (Sigara) 709 * scabricida (Walley) (Hcsperocorixn) 519 nchndc' (Hungerford) (Sigara) 769 .schadci Lundblad (Tcnagobia) 67 * ftcutellata (Crevecoeur) (Ramphocorixa) 448 * scdncta (B. White) (Tcnagobia) 74 sclccta (B. White) (Tcnagobia) 83 * scUaris (Abbott) (Trichocorixa) 361 scmiliicida (Walley) (Hesperocorixa) 508 * scrialn (Abbott) (Sigara) 745 scrrata Deay ( Tcnagobia) 81 scmdala (Uhler) (Graptocorixa) 176 * scxiineata (Champion) ( Trichocorixa) 335 SIGARA Fabricius 609 * SIG ARIDAE D. c% S , . 17 sigmoidea (Abbott ) (Sigara) 728 signata (B. White) (Tcnagobia) 74 signata (Fieber) (Sigara) 745 826 Index PAGE * signata inccrta Lundblad ( Tenagobia) 77 * signata socialis (B. White) {Tenagobia) 82 * simulans (B. White) (Tenagobia) 74 snoivi Hungerford {N eoconxa) 150 * sobrina (B. White) (Tenagobia) 74 socialis (B. White) ( Tenagobia) 82 * socialis sobriyia (B. White) (Tenagobia) 74 solensis (Hungerford) (Sigara) 686 sore7}soni n. sp. (Cenocorixa) 565 t STENOCORIXA Horvath 99 t STENOCORIXINAE n. subf 99 stigmatica (Fieber) (Sigara) 665 t striata (L.) (Sigara) 50, 609 stridulata n. sp. (Ectemnostegella) 216 SUBSIGARA Stichel (Sigara) 642 sutilis (Uhler) (Arctocorisa) 593 T tarascana Jaczewski (Corisella) 264 tarsalis (Fieber) (Corisella) 260 TENAGOBIA Bergroth 54 termasensis (Hungerford) (Sigara) 780 tetoni n. sp. (CaUicorixa) 469 * iexcocana Jaczewski (Corisella) 260 thomasi (Hungerford) (Graptocorixa) 160 townsendi (Hungerford) (Sigara) 795 transfigurata ( Walley) (Sigara) 689 TRICHOCORIXA Kirkaldy 29, 289 TRICHOCORIXELLA Jaczewski 236 trilineata (Provancher) (Sigara) 649 trimaculata (Le Guillou) (Sigara) 770 * trivittata (Provancher) (Sigara) 649 TROPOCORIXA Hutchinson (Sigara) 763 tnmcata Deay ( Tenagobia) 72 * tumida (Uhler) (Corisella) 260 tumidacephala n. sp. (Ectemnostegella) 210 U uhlcri Hungerford (Graptocorixa) 196 uhleri n. sp. ( Trichocorixa) 348 uhleroidea Hungerford (Graptocorixa) 170 * unguiculata (Champion) (Graptocorixa) 183 . utahensis (Hungerford) (Cenocorixa) 580 V vandykei n. sp. (Sigara) ^ 685 variabilis (Hungerford) (Sigara) 733 venturii n. sp. (Ectemnostegella) 211 VERMICORIXA Walton (Sigara) 652 Index 827 PAGE t verniiculata (Puton) (Heliocorisa) 44 verticalis calif ornica n. subsp. (Trichocorixa) 352 verticalis fenestrala Walley {Trichocorixa) 354 verticalis interiores n. subsp. {Tnchocorixa) 354 verticalis saltoni n. subsp. {Trichocorixa) 357 verticalis sellaris (Abbott) {Trichocorixa) 361 verticalis verticalis (Fieber) {Trichocorixa) 358 virginiensis n. sp. {Sigara) ' 671 J vittipennis (Horvath) {Xenocorixa) .■ 52 vulgaris (Hungerford) {Hesperocorixa) 530 vulnerata (Uhlei) {C allicorixa) 481 * wallenyreni (Stal) {Trichocorixa) 343 washing t one nsis n. sp. {Sigara) 673 westermanni Lundblad {H eterocorixa) 112 ivileyce (Hungerford) {Cenocorixa) 578 williamsi Hungerford {H eterocorixa) 120 * williamsi (Hungerford) {Neosigara) .■ 429 wollastoni (D. & S.) {Callicorixa) 484 * wolskii Jaczewski {Trichocorixella) 237 woytko^l^skii n. sp. {Ectemnostcgella) 213 woytkoxoshii n. sp. {H eterocorixa) 124 wrighti n. sp. {H eterocorixa) 116 wrighti ollalai n. subsp. {Heterocorixa) 118 X t XENOCORIXA Hungerford 199 XENOSIGARA n. subg. {Sigara) 631 Z zimmermanni (Fieber) {Sigara) 730 D ■22-822 Publications of the University of Kansas Recently adopted postal charges are 4 cents for the first pound and 3 cents for each ad- ditional pound iu the United States and possessions, and 1^ cents to all foreign countries. Volume KANSAS UNIVERSITY QUARTERLY I No. 1, weight, 12 ounces. Nos. 2, 3, supply exhausted. No. 4, weight, 12 ounces. II Nos. 1, 2, 3, 4, supply exhausted. Ill Nos. 1, 2, supply exhausted. No. 3, weight, 16 ounces. No. 4, weight, 12 ounces. IV No. 1, weight, 9 ounches. No. 2, weight, 12 ounces. Nos. 3, 4, weight each, 8 ounces. V No. 1, weight, 8 ounces. No. 2, weight, 6 ounces. Vol. V consists of only two numbers. VI, A. . . .Nos. 1, 2, 3, 4, supply exhausted. VI, B. . . . No. 1, weight, 8 ounces. No. 2, weight, 12 ounces. No. 3, weight, 8 ounces. No. 4, weight, 12 ounces. VII, A. . . .Nos. 1, 2, 3, 4, supply exhausted. VII, B. . . .Nos. 1-2, weight, 12 ounces. No. 3, weight, 8 ounces. No. 4, weight, 16 ounces. VIII, A No. 1, weight, 9 ounces. No. 2, weight, 10 ounces. No. 3, weight, 12 ounces. No. 4, weight, 12 ounces. VIII, B No. 1, weight, 8 ounces. Publication of Series B was suspended with this number. IX No. 1, weight, 10 ounces. No. 2. weight, 10 ounces. No. 3, weight, 9 ounces. No. 4, weight, 12 ounces. X Nos. 1, 2, 3, 4, weight each, 12 ounces. Volume UNIVERSITY OF KANSAS SCIENCE BULLETIN I Nos. 1-4, weight, 8 ounces. Nos. 5-9, weight, 12 ounces. Nos. 10-12, weight, 6 ounces. II Nos. 1-3, weight, 20 ounces. Nos. 4-9, weight, 11 ounces. Nos. 10-15, weight, 20 ounces. Ill Nos. 1-6, weight, 33 ounces. Nos. 7-10, weight, 25 ounces. IV Nos. 1-6, weight, 33 ounces. Nos. 7-20, weight, 28 ounces. V Nos. 1-11, weight, 33 ounces. Nos. 12-21, weight, 27 ounces. VI No. 1, weight, 27 ounces. Nos. 2-7, weight, 19 ounces. VII Nos. 1-17, weight, 50 ounces. VIII Nos. 1-10, weight, 52 ounces. IX Nos. 1-21, weight, 54 ounces. X Nos. 1-15, weight, 17 ounces. XI No. 1, weight, 20 ounces. XII Nos. 1-2, weight, 19 ounces. XIII Pt. 1, Nos. 1-9, weight, 12 ounces. Pt. II, Nos. 10-15, weight, 10 ounces. XIV Nos. 1-21, weight, 34 ounces. XV Nos. 1-6, weight, 18 ounces. XVI Nos. 1-6, weight, 14 ounces. XVII Pt. I, No. 1, weight, 18 ounces. Pt. II, Nos. 2-7, weight, 8 ounces. XVIII Nos. 1-13, weight, 38 ounces. XIX Pt. I, Nos. 1-7, weight, 6 ounces. Pt. II, Nos. 8-14, weight, 16 ounces. XX Pt. I, Nos. 1-6, weight, 11 ounces. Pt. II, Nos. 7-21, weight, 15 ounces. XXI Nos. 1-16, weight, 32 ounces. XXII Nos. 1-18, weight, 32 ounces. XXIII No. 1, weight, 40 ounces. XXIV Nos. 1-21, weight, 38 ounces. XXV Nos. 1-22, weight, 43 ounces. XXVI Nos. 1-15, weight, 40 ounces. XXVII Pt. I, weight, 20 ounces. XXVIII Pt. I, weight, 20 ounces. Pt. II, weight, 20 ounces. XXIX Pt. I, weight, 20 ounces. Pt. II, weight, 20 ounces. XXX Pt. I, weight, 15 ounces. Pt. II, weight, 17 ounces. XXXI Pt. I, weight, 15 ounces. Pt. II, weight, 24 ounces. The Kansas University Quarterly and the Science Bulletin will be sent in exchange for other publications of like character, or will be sent on receipt of the amount of postage according to weight mentoned above, or may be sent by express, charges collect. Separates of all articles in the Science Bulletin, not out of print, are available. Application should be made to Science Bulletin, Library of the University of Kansas.