pee ; ee - poser NN eee WIM OAT OA “ fy mye HN Aue WT STATION OLS bad bd TL Ja UNITED STATES DEPARTMENT OF AGRICULTURE LIBRARY Booknumber “andibulata, v.: 241) 7 Sik PRESENTED BY Bureau of Entomolory » 20 de OM sas JIyPan 4 4 woe = * @: , an Ve (a + ; } \ aie J Ae sal . , nm Ls hem a G/S63, ILLUSTRATIONS Vi 6 ; OF eat BRITISH ENTOMOLOGY; OR, A Synopsis of indigenous insects: THEIR GENERIC AND SPECIFIC DISTINCTIONS ; WITH ¢ AN ACCOUNT OF THEIR METAMORPHOSES, TIMES OF APPEARANCE, LOCALITIES, FOOD, AND ECONOMY, AS FAR AS PRACTICABLE. BY JAMES FRANCIS STEPHENS, F.L.S. MEMBER OF THE ZOOLOGICAL SOCIETY, ETC. EMBELLISHED WITH COLOURED FIGURES OF THE RARER AND MORE INTERESTING SPECIES. MANDIBULATA. VOL. II. ‘*¢ In his tam parvis tamque feré nullis que ratio! quanta vis! quam inextricabilis perfectio !”"_Plin. “ Finis Creationis Telluris est gloria Dr1, ex opera Nature, per Hominem solum.”’—Linné. LONDON: PRINTED FOR THE AUTHOR ; AND PUBLISHED BY BALDWIN AND CRADOCK. 1829. . a ah é vL | me nhiat ne peers: HR A I. / i) a) Cor aay ae P il AMEE odbc ‘A dona Bisasids fe heiress, ; * ; ; Re a ne ee a ‘ f ‘ / ‘ ¢ od me Ae rpaat Ye "2eese0 =. ILLUSTRATIONS BRITISH ENTOMOLOGY. COLEOPTERA. Subsection I.— GEopEPHAGA. Famity VI.—BEMBIDIIDZA mihi. ‘THE remarkable structure of the palpi of those insects which are contained in this family obviously distinguishes them from the Har- palide, with which they are associated by Mr. MacLeay, though Knoch, Illiger, Latreille, Clairville, and others, have separated them from the genus Harpalus, by the names of ae Elaphrus, Bembidion, Ocydromus, &c..respectively. _ How far their separation as a family from the foregoing may be strictly in accordance with the natural grouping of the Chilopodo- morphous insects, I shall not here attempt to show ; but, as I believe, with Mr. MacLeay, that Nature forms a kind of circular series in the chain of affinities in which the quinary principle predominates, I shall merely observe that I agree with Mr. Kirby in opinion, that she does not always dispose her subjects, in every department, into fives, but that different numbers may possibly obtain in different groups; and why not more than five in the overwhelming family of Geodephaga, when we find the succeeding one of iB Che cg Dua Xe) greatly deficient? So far as the habits of the Geodephaga are capable of differing, the insects of this family are evidently dissimilar to the Harpalide, as, unlike those insects in general, they usually frequent low, damp, and marshy situations, while the typical Harpalide affect dry, gra- velly, chalky, or hilly and mountainous districts; the less typical, as ‘l'rechus, &c. approximating to the Bembidiide and the latter to the Hydradephaga: again, the difference in the formation of the palpi cannot but strike the most incurious observer. Manpigurata. Vor. II. 1st Jury, 1828. B MANDIBULATA. — COLEOPTERA. The family and the genera into which I conceive that it should be divided may be known by the subjoined characters. Palpi; external mazillary and labial, with the terminal joint very minute, Corpus subulated ; the preceding generally much incrassated and clavate: labrum usually transverse: mandibles rather short, sometimes slender and porrect: labium quadrate: mentum emarginate. Antenne filiform, longer than the thorax: head generally narrower than the thorax; the latter various in form: elytra oblong-ovate ; rarely linear: anterior tibie emarginate: anterior tarsi of the males with one or more dilated joints, sometimes armed with a recurved claw beneath. (lineare, valde ¢ 4-to quali: » 64, LYMNAZUM. depressum: Antenne articulo 3-tio 2 4 -tolongiori: . 65. CILLENUM. ! § integer: . 66. TacHys. < subovale, _{ transversus, haud ( rotundatus, : natus: 67. PHILOCHTHUS. ! convexum truncato-cordatus, t emargi 7 aut paulo posticé acutus : : : - 68. Ocys. ocPe scum valdé acutis, ¢ 5-to longiori: . 69. PERYPHUS. Thorax 4 cordato- { Prominulis : truncatus, ) @lenne ar- sida - °< ticulis 3 et 4 5-to breviori: . 70. NOTAPHUS. augulis : 3 di ‘ b Betas vix acutis, ( mediocres: { subre- [P deflexis : thorax ~ motus: 71. LopHa. Oculi posticé € sessilis: 72. TAcHYPUS. magni : é . 73 BEMBIDIUM. GENUS LXIV.—Lymnaum * mihe. Palpi rather elongate ; external mazillary with the basal joint minute, the second very long, cylindric, the third stout, subclavate, very pilose, shorter than the- second, terminal very minute: labial with the terminal joint one-third as long. as the preceding, which is much incrassated, ovate-truncate, and very pilose: labrum transverse, entire, slightly rounded anteriorly: mandibles short, ob- tuse, bent: mentum deeply emarginate, the emargination with an obtuse lobe. Antenne slightly pubescent, with the basal joint naked, the third and fourth joints of equal length ; the following elongate: head large, subovate: thorax cordate truncate: elytra nearly linear, greatly depressed: anterior tarsi of the males? with the two basal joints dilated ; the antepenultimate with a curved spine beneath. Lymneeum differs from Cillenum by the equal length of the third and fourth joints of the antennz, and by the elongation of all the following, by having the labrum entire, and slightly produced in the centre, by the greater elongation of the palpi, and by their form and proportions; the terminal joint of the labial being much longer, and of the external maxillary considerably shorter, than in that genus; the third joint of the latter is much more robust, and * Aiuyy, stagnum. ble al " aE eA A NT ae ane + j yO RAN C0 oy; TS TH lated a s ih i i i , i ‘ Z & *s i - bd London, fub. by &, LAuge G26 - La Xe: C.Waastar? sc. BEMBIDIIDEZ.—LYMN&£UM. 3 the preceding cylindric; the armed antepenultimate joint of the tarsi (as in Aépus) is also an essential distinction, and the body is rather dilated. Sp. 1. nigropiceum. Prats X. f. 1.—Nigro-piceum, antennis pedibusque paulo dilutioribus, elytris profundiusculé striatis. (Long. corp. 2 lin.) Ca. nigropiceus. Muarsham.—Ly. nigropiceum. Steph. Catal. p. 36. No. 340. Pitchy-black, with a tendency to ferruginous: head nearly castaneous, with two oblong longitudinal slightly rugose impressions in front, the posterior part im- punctate: thorax deep pitchy ferruginous, depressed, with a strong longi- - tudinal dorsal channel, terminating anteriorly in a bifid oblique line, which reaches to the anterior angle, leaving a triangular space, which is impunctate and of a paler hue than the rest of the surface, the base excepted, which is similar and a little punctate; the disc has a tinge of blue: elytra depressed, deep pitchy-black, striated, the strie deep, but simple, the interstices convex, with two very strongly impressed dots on the fourth from the suture: legs ferruginous: antenne, palpi, and labrum fulvous-red. The only specimen I have seen of this remarkable insect I ob- tained from the Marshamian cabinet; its locality is unknown to me. Sp. 2. depressum. Piceo-nigrum, antennarum basi ore pedibusque pallide fulvis, _ elytris tenué striatis. (Long. corp. 1+ lin.) Ta.? depressus. Curtis, MSS.?—Ly. depressum. Steph. Catal. p. 36. No. 341. Pitchy-black ; head with an arcuated impression on each side round the eyes: thorax greatly depressed, with a deep longitudinal line; the disc sparingly, and the base thickly, punctured: elytra also very flat, slightly clothed with short hairs, obsoletely striated, the strie impunctate, the interstices depressed and sparingly punctulate: legs pale rufo-fulvous: antenne with the basal joint fulvous; the two following tinged with the same, the rest dusky. This insect appears to associate with the foregoing ; but, having a single in- jured specimen only, I cannot decide with certainty on the point. “Taken on Dudden Sands, near Broughton, Lancashire; not uncommon, but difficult to secure, on account of the wind.”— J.C. Dale, Esq. Grnus LXV.—Cittenum, Leach. Palpi short ; external mazillary with the second and third joints subclavate, the latter rather the longest and stoutest, and pilose, the terminal short and slender; /abial with the terminal joint very minute and short, the preceding robust, subclavate, pilose: labrum transverse, concave anteriorly: mandibles elongate, slender, bent, and acute: mentum deeply notched, with an obtuse central lobe. Antenne pubescent, the third joint considerably longer than the fourth, the fifth to the tenth moniliform: head broad: thorax cordate- truncate, hinder angles acuminated: elytra linear, much depressed: anterior tarsi dilated, especially in the males. B2 A MANDIBULATA.—COLEOPTERA. Cillenum differs from the other Bembidiide (excepting Lym- neum) by its linear depressed body; and from that genus it may be known by the length of the third joint of the antenne, which considerably exceeds that of the fourth, and by the following joints being moniliform: it also differs in the proportions of the palpi, and in wanting the spine beneath the antepenultimate joint of the an- terior tarsi. Sp. 1. laterale. Viridi-cuprewm aut eneum, nitidum, antennarum bast pedibusque testaceis, elytris ochraceis eneo micantibus, tenue punctato-striatis. (Long. corp. 12—2 lin.) Ci. laterale. Leach, MSS.—Curtis, v. pl. 200.—Steph. Catal. p. 36. No. 342. Bright-copper, or zneous, sometimes glossed with purplish: head and thorax minutely punctured, the former with two frontal sulci, the latter with a faint longitudinal channel: elytra ochraceous, glossed with greenish-brass, the lateral margin and part of the base excepted ; slightly striated; the stri obscurely punctured, and the third with four fovee on the inner side: body beneath shining bronze; legs and base of the antenne testaceous ; tip of the latter and mouth pale-tawny. | Taken on several of the coasts, particularly on the northern coast of Norfolk. “ Portobello Sands.”—Dr. Leach, who discovered the insect in Britain. “ Southend.”-—Rev. F. W. Hope. “Near Cromer, in Norfolk."-— Rev. T. Skrimsiure. ions Genus LXVIL.—Tacuys, Ziegler. Palpi nearly as in Lymneum, but shorter, and more slender in proportion ; external maxillary with the second joint obscurely subclavate ; the following robust, subclavate, pilose; the terminal very short, slender, acute, usually deflexed ; labial with the terminal joint above one-third as long as the pre- ceding, slender ; the latter subclavate, a little curved on one side: labrum transverse, entire: mandibles short, acute: mentum emarginate anteriorly, the emargination with an acute central tooth. Antenne pubescent, the basal joint naked, second and fourth joints of equal length: head ovate: thorax transverse, the sides rounded, entire, as wide behind as before: elytra oblong ovate: body slightly convex: anterior tarsi of the males with the basal joint dilated. The short, transverse, regularly-rounded, entire thorax, well distinguishes this genus from the others of the family: it las also some other peculiar characters, particularly the elongation of the second joint of the antenne, which is equal in length to the fourth, and thus also differs from Philochthus. BEMBIDI!IDA.—TACHYS. oD Sp. 1. scutellaris. Subdepressus, niger, elytris pallidis versus suturam utrinque obsoleté tristriatis. (Long. corp. 12 lin.) Ta. scutellaris mzhz.—Steph. Catal. p. 36. No. 343. Somewhat depressed ; black: head smooth, with a deep impression on each side in front between the eyes: thorax with the disc slightly convex; a strong dorsal channel, and a slight fovea on each side at the base: elytra pale, with the region of the scutellum dusky, and the hinder half somewhat suffused with the same; on each side of the suture three imperfect and obsolete punctate strie, vanishing at the tip ; the exterior portion of the elytra smooth, with a deep impression on the disc: legs very pale: antennz pale at the base, slightly fuscescent towards the apex: labrum and mandibles pale fulvous, the latter with the tip dusky. — Two specimens of this species were taken on the sandy coasts of Hants, by an active and industrious collector, Mr. D. Bydder, some years since; they are the only examples I have hitherto seen, and greatly resemble the insects of the preceding genus upon a transient inspection. Sp. 2. binotatus. Nigro-eneus, elytris striatis puncto apicali, tibiis tarsisque pallidis. (Long. corp. 14—12 lin.) Ta. binotatus mzhi.—Steph. Catal. p. 36. No. 344. | Brassy or greenish-black ; slightly glossy: head with a deep longitudinal im- pression on each side, between the eyes: thorax a little convex, obsoletely wrinkled transversely, with a faint longitudinal channel, and a deep im- pressed fovea on each side at the base: elytra slightly convex, striated, the strie composed of punctate dots, and nearly obliterated on the outer edge of the elytra, towards the apex of which is a round pale spot: femora pitchy- black ; tibie and tarsi pale fulvous: antenne fuscous, with the basal joint rufescent. Not uncommon throughout the metropolitan district.“ South- end.”— Rev. F. W. Hope. Sp. 3. vittatus. Nigro-eneus, elytris striatis, vitté apicali pedibusque pallidis. (Long. corp. 14—14 lin.) Ta. vittatus mzhi.—Sieph. Catal. p. 36. No. 345. Rather larger than the last; deep, glossy, brassy-black ; head as in the last: thorax smooth, or very obsoletely wrinkled transversely, with a faint longi- tudinal channel, and a small impression on each side at the base: elytra rather deeply punctate-striated, the strie cbsclete at the apex ; the latter with an undefined pale streak, or sometimes entirely pale: legs entirely pale- fulvous: antenne dusky, with the basal joints reddish. Common in damp banks, &c. near London. “ In Copenhagen- fields, near ponds.”—-Mr., Ingypen. 6 MANDIBULATA.—COLEOPTERA. Sp. 4. immunis. Alnéo-niger, aut violaceus, elytris obsoletissimé punctato- striatis, immaculatis, pedibus piceo-rufis, femorum basi piceis. (Long. corp. 14 lin.) Ocys immunis.— Kirby, MSS. Ta. immunis.—Steph. Catal. p. 36. No. 346. Glossy brassy-black or violet; head with a rather obsolete curved impression on each side, between the eyes: thorax with the disc convex, the dorsal channel obsolete, and an excavated fovea on each side at the base: elytra a little dilated in the middle, of a bluish or violaceous hue, the suture somewhat rufescent, obsoletely punctate-striated, the lateral strie nearly obliterated, the apex immaculate: the legs pitchy-red, with the base of the thighs pitchy ; antenne rufescent at the base, the tip dusky. Also common near London, in Copenhagen and Battersea Fields, &e. “ Cork, Milford-Haven, and Dartmoor.”"—Dr. Leach. Sp. 5. obtusus. Piceo-niger, antennarum basi pedibusque rufescentibus, elytris immaculatis punctato-striatis, interstitio tertio bipunctato. (Long. corp. 14 lin.) Be. obtusum.—Sturm? Ta. obtusus.—Steph. Catal. p. 36. No. 347. Allied to the last: deep pitchy-black: head with a deep impression on each side: thorax bread, convex, with a slight dorsal line ; the base punctulate, with an impressed line on each side: elytra punctate-striated, with two or three impressed dots between the second and third strie from the suture: legs pitchy-red: antenne fuscous, with the base pitchy. Far from uncommon in the neigbourhood of London. “ Netley, Salop.”—Rev. F. W. Hope. ‘ Banks of ponds, Copenhagen-fields.” Mr. Ingpen. | Sp. 6. pusillus. Piceo-wneus aut virescens, thorace posticé utrinque foveolé punctata, elytris tenué punctato-striatis, apice piceis. (Long. corp. 14 lin.) Ta. pusillus. De Jean.—Steph. Catal. p. 36. No. 348. Pitchy-brass or greenish, shining: head with a small impression on each side between the eyes: thorax convex, with a faint dorsal line, and a punctate impression on each side at the base: elytra rather faintly punctate-striated, the exterior strie nearly obliterated, the tip piceous: legs pitchy-red: antennz fuscous, with the basal joint rufescent. Frequently taken near London. “ Netley, Salop."—Rev. F. W. Hope. ‘ Banks of ponds, Copenhagen-fields.”—Mr. Ingjpen. Sp. 7. gracilis. . Steph. Catal. 1. c.—The head rufo-ferruginous: the elytra immaculate. Not very abundant near London: found occasionally in ponds and ditches in Battersea-fields, and near Hertford: also found in Norfolk. “ Putney and Wandsworth Commons.”—Mr. Ingpen. ‘‘In the pond in the Botanic Garden, Cambridge.”—Hev. L. Jenyns. Sp. 3. mucronatus. Piare XI. f. 1.—Rufo-ferrugineus, nitidus, elytris tenué punctato-striatis, interstitiis levigatis, apice mucronato. (Long. corp. 2—25 lin.) Ha. mucronatus. Leach, MSS.—Steph. Catal. p. 43. No. 415. Ovate-acuminate ; deep rufo-ferruginous; glossy; head slightly punctulate: thorax finely and very thickly punctulate throughout, especially on the hinder margin: elytra faintly punctate-striated, the interstices impunctate, the apex mucronated ; the disc convex, immaculate: body beneath pale testaceous-red ; the ventral lamine deeply and coarsely punctate: legs and antenne ferruginous. Distinguished from the following by the absence of punctations between the strie, the mucro at the apex of the elytra, deeper colour, and totally punctate thorax. My specimens of this insect were obtained from the neighbour- liood of Swansea: I believe the Ha. ophthalmicus of Mr. Kirby’s MSS. is synonymous; if so, it inhabits the county of Suffolk also. “‘ A single specimen taken at Bottisham.”—Rev. L. Jenyns. Sp. 4. ferrugineus. Rufo-ferrugmeus, nitidus, elytris profundé punctato-striatis, interstitits seriehus punctorum minorum. (Long. corp. 2—24 lin.) Dy. ferrugineus. Zinné.—Ha. ferrugineus. Steph. Catal. p. 43. No. 416. Ovate acuminate, glossy, ferruginous-red: head finely punctate: thorax ferru- ginous, with the disc rather smooth, the margins thickly punctate, the base with a transverse streak of impressed dots: elytra ovate, much dilated at the base, the apex obliquely truncate, rather acuminate, each with ten regular punctate strie, the interstices with a faint row of small remote impressions on each, and a continuous stria of minute approximating dots towards the sutural stria: body deep glossy ferruginous beneath; the central lamine paler, deeply punctate ; legs ferruginous. Var. B. Steph. Catal. 1. c.—With the strie dusky, with a few oblong dusky- black spots between. Var. y. Steph. Catal. 1. c.—The elytra dusky, thickly spotted with black in the - interstices between the striz. Tite 1 Wy 180. in te DYTICIDZ.—HALIPLUS. y Al ‘Not uncommon in ditches and ponds near London, Sod at Hert- ford and Ripley; also in Norfolk. ‘ Wandsworth-common.”— Mr. Ingpen. “ Plentifully at Bottisham.’—Rev. L. Jenyns. Sp 5. obliquus. Flavo-testaceus, elytris obsolete punctato-striatis, basi, fascia media inequali lituraque intra apicem nigris. (Long. corp. 13—2 lin.) Dy. obliquus. Jiliger.—Ha. obliquus. Steph. Catal. p. 43. No. 417. Testaceous yellow ; head glossy, finely and thickly punctate, with a blackish streak behind: thorax pale testaceous, the anterior margin more or less dusky, the surface very finely punctate throughout, with a sinuated row of larger impressions at the base, and a straight one at the apex, placed transversely, elytra acuminated, pale-yellowish, rather obsoletely punctate-striated, with the base, an irregular oblique interrupted fascia, and a patch at the apex, black: body glossy testaceous-yellow beneath, the lamine obsoletely punc- tated: legs and antenne pale ferruginous. Var. g. With the spots on the elytra more or less confluent. Not very common: found in the metropolitan district, and in Norfolk. ‘ Sparingly at Bottisham.”—Rev. L. Jenyns. Sp. 6. confinis. Rufo-testaceus, elytris obsolete punctato-striatis, strits i= fuscatis, interstitiis immaculatis. (Long. corp. 1? lin.) Ha. confinis. Kirby MSS.—Steph. Catal. p. 43. No. 418. Testaceous-red, slightly shining: head obscurely but thickly punctate, dusky behind: thorax ferruginous, immaculate, obsoletely punctate, with an im- pression behind the centre of the disc: elytra acuminated, faintly punctate- striated, the strie dusky, the interstices immaculate and impunctate: body rufo-testaceous beneath, the lamine finely punctated: legs and antenne fer- ruginous, the latter palest. Var. 6. With the strie on the elytra transversely fuscous, the colour sometimes confluent towards the apex. Taken occasionally near London, but more frequent in Norfolk and Suffolk. ‘ Wandsworth-common and Copenhagen-fields.”— Mr. Ingpen. Sp. 7. lineato-collis. .Pallidé testaceus, thorace lined longitudinali nigra, strigd posticd lunulisque duabus impressis. (Long. corp. 14—132 lin.) Dy. lineato-collis. Marsham.—Ha. lineato-collis. Steph. Catal. p. 43. No. 418. Pale-testaceous: head ferruginous, thickly punctate, the vertex sometimes pitchy : thorax rather convex, rather thickly punctulate, the anterior edge and a longitudinal dorsal line dusky-black ; near the base is a transverse impressed streak, deepest in the middle, and, near the margin, on each side, a very deep arcuated impressed stria: elytra acuminated, rather convex, pale, shining, striated, the strie composed of deep impressions, the interstices with a few scattered dots, and several obsolete brown spots ; at the base of the fourth and fifth strie from the suture are two very short and deep oblique striole: body 42 MANDIBULATA.— COLEOPTERA. deep-ferruginous beneath ; the lamine deeply punctate: legs elongate, pale< testaceous. Taken in the neighbourhood of London, at Hertford, Whittlesea Mere, and in Norfolk. ‘ At Bottisham, sparingly.”—Rev. L. Jenyns. ‘ Wandsworth-common and Copenhagen-fields.”—Mr. Ing pen. Sp. 8. margine-punctatus. lavo-griseus, aut fuscus, elytris punctato-striatis maculis marginalibus utrinque tribus. (Long. corp. 12 lin.) Dy. margine-punctatus. Panzer.—Ha. margine-punctatus. Steph. Catal. p. 43. iNVo. 420. Ovate, griseous-yellow, or fuscous: head small, castaneous, slightly punctulate : thorax ferruginous, immaculate, obsoletely punctulate: elytra acuminate, tes- taceous, or dusky, with brownish strie, the strie composed of impressed dots, the interstices with a few minute scattered impressions, and the margin with three rounded black or fuscous spots: body fuscous beneath ; legs dusky. Rare, found near London, and in Cambridgeshire. “A single specimen taken in the pond in the Botanic Garden, Cambridge.” —Rev. L. Jenyns. Sp. 9. ruficollis. Satwraté rufo-testaceus, vertice abdominisque bast piceis, elytris punctato-striatis, interstitiis fusco-maculatis, thorace immaculato, disco subleve. (Long. corp. 1s—12 lin.) Dy. ruficollis. De Geer ?—Ha. ruficollis. Steph. Catal. p. 43. No. 421.—Dy. minutus. Don. il. pl. 68. f. 1. 2. Deep testaceous red: head finely punctured, with the vertex piceous: thorax pale, or yellowish-red ; glossy, the disc nearly smooth, the margin finely punctate, with a transverse waved striga of small, obsolete, impressed dots, and a minute stria at the base on each side: elytra acuminate, rather convex, pale dusky-testaceous, deeply punctate-striated, the punctures dusky, and the interstices more or less spotted with deep pitchy dots, and each with a few minute scattered impressions, the sutural one with the latter approximating: body pale-testaceous beneath: the lamina deeply punctate: legs and antenne pale. Very abundant in ponds and ditches throughout the metropolitan district: also found in Norfolk, in Whittlesea Mere, &c. ‘* Wands- worth-common and Copenhagen-fields.”—Mr. Ingen. *“ At Bottis- ham, plentifully.”—Rev. L. Jenyns. Sp. 10. affinis. Griseo-flavus, capite rufo-testaceo, elytris punctato-striatis, striis infuscatis, interstitiis immaculatis, thoracis disco obsoletissime punctu- lato. (Long. corp. 1+ lin.) Ha. affinis mihz. Steph. Catal. p. 43. No. 422. Griseous-yellow: head testaceous-red, obscurely punctulate: thorax with the dise very obsoletely punctulate, the margins distinctly punctate, the base with DYTICIDZ.—PELOBIUS. 43 an undulated row of impressed dots, and an obsolete short stria on each side, as in the preceding insect: elytra acuminate, punctate-striated, the strie dusky, the interstices immaculate and impunctate: body pale-testaceous be- neath ; ventral lamine finely punctate: legs and antenne pale. Closely allied to the last, but the strie on the elytra dusky, the spaces between immaculate and impunctate: the disc of the thorax more obsoletely punctate. Found near London. “ Swaffham-fen.”—Rev. L. Jenyns. Sp. 11. melanocephalus. Prceo-testaceus, elytris profundé punctato-striatis, striis infuscatis, interstitiis obsoletissimé maculatis, capite nigro-piceo. (Long. corp. 1 lin.) Ha. melanocephalus mhz. Steph. Catal. p. 43. No. 424. Less than any of the foregoing: pitchy-testaceous; the head pitchy-black, the vertex deepest, punctulated: thorax ferruginous, very finely punctate through- out, especially on the hinder margin, which is rather depressed: elytra acu- minate, deeply punctate-striated, the strie dusky, with the interstices ob- scurely spotted with black, and impunctate: body testaceous beneath ; ventral lamine rather deeply punctate: legs and antenne testaceous; the latter palest. I have one specimen of this insect, which I obtained from the Marshamian Collection: its locality is unknown to me. Sp. 12. brevis. Rufo-testaceus, elytris obtusis, subcinereis, punctato-striatis, striis infuscatis, interstitiis immaculatis, thoracis disco punctulato. (Long. corp. 14 lin.) Ha. brevis. Kirby MSS.—Steph. Catal. p. 43. No. 423. Rufo-testaceous: head slightly ferruginous: thorax with the disc punctulate, the margin more deeply so, especially behind, where it is a little depressed, and has a faint rudimentary striola on each side: elytra obtuse, slightly cine- reous, punctate-striated, the strie dusky, the interstices immaculate: body beneath pale-testaceous; lamine paler, deeply punctate: legs and antenne ferruginous. | Distinguished from the nine preceding insects by the obtuseness of the apex of the elytra, and from the three last by the punctulated thoracic disc. Of this species I have also one specimen only, which I caught near London, and compared several years since with Mr. Kirby’s, which were taken in Suffolk. Genus LX XVIII.—P2auogzivus, Schonherr. Palpi, external maxillary with the terminal joint subclavate, the preceding elongate, clavate, with a tooth on its inner edge, the two basal rather short: labrum very narrow, entire, with a depression on its anterior edge: mandibles obtuse, strongly bidentate at the tip: mentum anteriorly emarginate: Antenne distinctly 11-jointed, the basal joint very large and thick, the second some-« AA, MANDIBULATA.—COLEOPTERA. what globose ; the following, to the tenth, nearly equal in length, elongate, clavate: the terminal elongate acute; head ovate; eyes very prominent: thorax bisinuate behind: scutellum exposed, triangular: body oval, convex, obtuse posteriorly: legs gressorial, the hinder femora free: claws didactyle. Males with the four anterior tarsi equally dilated. Pelobius differs from Haliplus and the five following genera by having a distinct, exposed, scutellum, and from the remaining Dy- ticide by having all the legs gressorial: it also differs in other im- portant characters, as above pointed out, and very conspicuously by the great convexity of its body, which somewhat approaches to the form of that of the genera Haliplus, Hyphidrus, and Hygrotus. Sp. 1. Hermanni. Ferrugineus, oculorum ambitii, margine antico et postico thoracis, elytrorumque disco nigris. (Long. corp. 5—5% lin.) Dy. Hermanni. Linné.—Don. xiv. pl. 501. f: 2—Pe.Hermanni. Steph. Catal. p. 43. No. 425. Ferruginous: head with a black patch round the eyes, expanded towards and somewhat approximating on the forehead: thorax with its anterior and pos- terior margins black: elytra with a large black patch on the disc, the anterior and lateral edges a little sinuated with the ferruginous ground, very convex, rugose, with several smooth longitudinal lines, which converge to- wards the suture at the apex: abdomen with the base ferruginous, the apex black ; breast and sides of the thorax the same: legs pale ferruginous. Pe. Hermanni is not a very abundant insect, especially in the northern counties, where, I believe, it occurs but rarely, if at all: near the metropolis, however, I have met with it in several places, particularly in the ponds in Copenhagen-fields: it occurs in Norfolk. When taken it makes a noise by the friction of its abdomen against. the elytra. ‘ Once found in a stream close to Cambridge.”— Rev. L. Jenyns. Wandsworth-common, Hampstead-heath, and Sun- bridge, in Kent.,-—Mr. Ingpen. ‘ Ditches and ponds near Lime- house and Bow.”—Mr. Stone. Genus LX XIX.—Hypuinrvs, Illiger. Palpi, external mazillary with the terminal joint elongate conic, the preceding . short cylindric: labrum transverse entire: mandibles emarginate at the apex: mentum anteriorly emarginate, the centre scarcely produced. Antenne very short, the two basal joints largest, the fourth smallest, the terminal longest, abruptly acuminate: head rounded, depressed: thorax very short, transverse, produced in the middle behind: scutellum none: body nearly globose: legs formed for swimming: the four anterior tarsi four-jointed, with the last joint abbreviated ; the posterior tarsi with one claw. DYTICID®.—HYPHIDRUS. AD The chief characters of this genus consist in its nearly globose body, the abbreviated joint to the four anterior tarsi, the monodac- tyle posterior legs, the absence of a scutellum, and the subacute terminal joint of the external maxillary palpus. Sp: 1. ovatus. Brevis, ovatus, ferrugineus, elytris brunneis, immaculatis. (Long. corp. 2—23 lin.) Dy. ovatus. Linné—Dy. ferrugineus. Don. ii. pl. 68. f: 3. 4.—Hy. ovatus. Steph. Catal. p. 43. No. 426. Short, ovate, ferruginous: male very finely punctulated: head and thorax rufo- ferruginous ; the latter slightly convex, depressed towards the suture of the elytra; finely punctulate throughout, with a few larger impressions towards the middle of the base: elytra ovate, depressed on the back, rusty-brown, with 2 silken gloss, the margin paler, throughout finely and thickly punctate: body very convex beneath, ferruginous, the breast strongly, and the abdomen faintly, punctate: legs ferruginous: antenne testaceous. @ Dy. ovalis. Fabricius.—Steph. Catal. p. 44. No. 427. Female larger, of a deeper colour; the thorax and elytra thickly and rather deeply punctate ; the latter glabrous and shining. Most convincing proofs have been observed of the identity of the two insects above described ; I have therefore united them as sexes of one species, although Gyllenhal and others still conceive them to be distinct. Far from uncommon im stagnant waters in the London district : found also in Norfolk and Devonshire. ‘* Common in Cambridge- shire.’— Rev. L. Jenyns. “ Parson’s-green, Wandsworth-common, — and Copenhagen-fields."— Mr. Ingen. Sp. 2. variegatus? Hlongato-ovatus, subattenuatus, paulo depressus, pallide-fer= rugineus, thorace maculis duabus baseos fuscis obsoletis, elytrorum margine maculisque pallidis. (Long. corp. 24 lin.) Hy. variegatus? Iiliger.—Steph. Catal. p. 44. No. 428. Elongate-ovate, slightly acuminated: pale ferruginous: head broad, thickly punctate: thorax with two rather indistinct, round, dusky spots towards the base; the dise with a slightly-elevated transverse line; the surface thickly punctate: elytra rather depressed, posteriorly acuminated, obscure, thickly punctated, dusky-ferruginous, with the margin and several spots and streaks pale-testaceous: the body slightly gibbous beneath, testaceous, with the breast thickly punctate: legs testaceous. This is different from the insect Mr. Hope has received from the continent as the Hy. variegatus of Illiger, but it approaches very closely to the one de- scribed by Gyllenhal, in his 4th vol., as a variety of Hy. ovalis; but its form is essentially different from that of the insect last described. Of this species I have seen but one indigenous specimen, which was captured in Essex, and is in my collection. 46 MANDIBULATA.—COLEOPTERA. Genus LX XX.—Hyerortus,* mihi. Palpi, external maxillary with the terminal joint stout, tumid, ovate conic, acute: labrum minute: mandibles deeply notched at the apex: mentum tri- dentate anteriorly. Antenne short, the two basal joints rather elongate; the third and fourth very stout, equal in length; the remainder rather stouter and longer, the terminal being longest: head broad, depressed: scutellum none: body sub-globose, very convex, as high as broad: elytra ovate: legs elongate ; the four anterior tarsi with four, the two posterior with five joints; all didactyle. Hygrotus differs from Hydroporus by the superior convexity of the body, the more deeply emarginated apex of the mandibles, the swollen and acute terminal joint of the external maxillary palpi, and by the brevity of the third and fourth joints of the antenne: the genus very much resembles the preceding one, but from that it is readily known by the didactyle posterior tarsi. Sp. 1. fluviatilis. Prare XI. f. 2. Flavo-testaceus, thorace utrinque striolé acuta impressd, elytrorum disco nigro, flavo-maculato. (Long. corp. 14— 13 lin.) Hyd. fluviatilis. Leach MSS. Hyg. fluviatilis—sSteph. Catal. p. 44. No. 429. Testaceous-yellow above, very obscurely punctulated: head pale, eyes dusky : thorax with a transverse elevated disc, and on each side a curved impressed line, the base obscurely impressed ; on the disc is an abbreviated transverse spot, which becomes attenuated on each side: elytra very finely punctulated, obsoletely striated, with two of the strie more distinct and punctated; the disc with a large, irregular, black patch anteriorly, united by a smaller pos- terior one and by three or four black lines, leaving an irregular patch towards the suture, and a rounded one on the lateral margins, as well as the apex, base, and margins, of each elytra, yellowish: body beneath testaceous, finely punctulated: legs testaceous. Not found in the vicinity of the metropolis, but a native of hilly and mountainous districts. ‘ In the river Cawdor, near Carlisle, and in the ‘Tavy, in Devonshire.”—Dr. Leach. ‘“ Netley, Salop, very abundant.”—Fev. F. W. Hope. Sp. 2. assimilis. Supra ferrugineus, thorace utrinque impresso, elytres lineis migris abbreviatis. (Long. corp. 12 lin.) Dy. assimilis. Paykul—Hyg. assimilis. Steph. Catal. p. 44. IVo. 430. Above ferruginous and thickly punctulated: head with a narrow fuscous mar- gin to the vertex: thorax with the sides rounded, transversely convex in the * Yyeorns, humiditas. DYTICIDE.—HYGROTUS. AMY middle; within the margin, on each side, a bent, impressed fovea, and, to-« wards the middle, an obsolete transverse one, in which are two oblong fuscous spots: elytra moderately convex, pale shining testaceous, the suture narrowly brown, each elytron with about five more or less confiuent longitudinal lines on the disc, the two exterior shorter, and interrupted in the middle by a large pale spot: body pitchy-ferruginous, and obsoletely punctated beneath: legs elongate, ferruginous, with the base of the femora obscure. Very similar to the preceding, but the ee. on the elytra different, the colour more ferruginous, &c. “In the river Plym, near Plymouth.”—Dr. Leach. ‘Netley, Salop, and Aldborough, Suffolk.”—Rev. F. W. Hope. tSp. 3. decoratus. Ferrugineus, elytris roping: punctatis fusco-brunneis, macula didymét anticd, lunuléque posteriori pallidis. (Long. corp. 14 lin.) Hyp. decoratus. Gyllenhal.Hyg. decoratus. Steph. Catal. p. 44. No. 431. Somewhat resembling Hy. pictus: colour rufo-ferruginous ; head large, glossy, nearly smooth; eyes black: thorax shining, thickly and closely punctate: elytra large, ovate, smooth, shining, pitchy-brown, with several deeply-im- pressed, large, irregularly-scattered dots, and some minute ones between, with a large double pale spot at the base of each elytron, and a transverse lunule of the same colour a little beyond the middle, following the outline of the thorax, and connected with the exterior pale margin: body shining, reddish- brown beneath: legs entirely pale testaceous: antenne ferruginous, with the tips dusky. ° This insect, which is the Hy. cuspidatus of Kunzé, has been seldom found in England: there is one specimen in the British Museum, and the Rev. F. W. Hope has taken it at Netley. Sp. 4. confluens. Niger, capite thoraceque ferrugineis, elytris pallidis, lineis quatuor abbreviatis nigris. (Long. corp. 14—1? lin.) Dy. confluens. Fabricius. Hyg. confluens.—Steph. Catal. p. 44. No. 432. Rather depressed: head finely punctulated, ferruginous, with the crown and region of the eyes dusky: thorax thickly punctulated, pale-ferruginous, im- maculate: elytra pale griseous, punctated, with a single regularly punctate stria on each, near the suture, the latter black ; the disc posteriorly with four or five parallel black lines, which are frequently united behind; the sutural one and the third abbreviated anteriorly: body glossy-black beneath, deeply punctate: legs pale ferruginous. A very common species throughout the metropolitan district: also found in Norfolk, and in Whittlesea Mere. “* Wandsworth- common and Copenhagen-fields.”—Mr. Ingpen. Sp. 5. collaris. Ferrugineus, elytrorum bast, suturd linetsque distinctis in- terruptis nigris. (Long. corp. 1}—14 lin.) Dy. collaris. Panzer.—Hyg. collaris. Steph. Catal. p. 44. No. 433. 48 -MANDIBULATA.—COLEOPTERA. Ferruginous: head finely punctulated, with a large impressed spot on each side between the eyes: thorax with its hinder margin dusky: elytra pale ferru- ginous, with the base and suture black ; parallel with the latter is a longi- tudinal line, which is generally interrupted beyond the middle, and does not reach to the base: from the shoulder is a second, bent outward obliquely, and behind this is a short, duplex, irregular one, which is sometimes slightly hosked: body beneath totaily pale ferruginous: legs testaceous. Var. %. With the lines on the elytra slightly confluent towards the apex. Not so abundant as the last, though frequently met with in ditches and ponds round London: also in South Wales and Devonshire. ‘ Wandsworth-common and Copenhagen-fields.”— Mr. Ingpen. Sp. 6. affinis. Saturatée ferrugineus, elytrorum disco nigro lineis obsoletis in- terruptis margineque ferrugineis. (Long. corp. 14 lin.) Hyg. affinis mihi. Steph. Catal. p. 44. No. 434. Deep ferruginous: head as in the last, with the vertex slightly fuscous: thorax with the hinder margin black: elytra thickly punctulated, black, with several obsolete interrupted lines, and the outer margin ferruginous: body beneath ferruginous: legs pale testaceous. Found with the preceding, of which it may prove a variety, differing chiefly in having the elytra nearly entirely black, and more punctulated than in the last : it is also somewhat larger. Taken near London. Sp. 7. reticulatus. Ferrugineus, thorace margine postico in medio nigricante, elytrorum disco nigro liners interruptis ferruginets. (Long. corp. 14 lin.) Dy. reticulatus. Fabricius. Hyg. reticulatus. Steph. Catal. p. 44. No. 435. Ferruginous: head as in the last: thorax finely punctulated, pale ferruginous, the hinder margin dusky in the middle: elytra covered with large irregular impressions, and many very minute ones between; the disc black, with the lateral margin, an angulated spot near the base, a line near the suture, and several interrupted ones on the disc pale ferruginous: body pale ferruginous beneath: legs testaceous. This and the two preceding species greatly resemble each other, and all are by Gyllenhal presumed to be varieties of Hy. reticulatus of Fabricius; but I am induced to consider them different, until their identity shall be more satis- factorily proved. Found near London: South Wales, and in Devonshire. Sp. 8. inequalis. Ferrugineus profundé punctatus, thorace anticée posticéque nigris, elytris nigris, lateribus sinuatim ferrugineis. (Long. corp. 14—12 lin.) Dy. inequalis. _Fabricius—Hyg. inequalis. Steph. Catal. p. 44. No. 436. Ferruginous, deeply punctate: head faintly punctate, with a deep impression on each side of the forehead ; thorax with the anterior and posterior margins DYTICIDE.—HYGROTUS. 49 black: elytra glossy black, thickly and deeply punctate, the lateral margin broadly and unequally ferruginous, with an irregular testaceous spot near the base, posteriorly bifid, sometimes united by a pale streak to the margin, the apex sometimes with a narrow black line on the lateral coloured margin: body deep shining ferruginous ; deeply punctulated: legs elongate, pale fer- ruginous. The markings on the elytra very much as above indicated. Not uncommon in various parts of the south of England, and in Ireland. ‘In turf pits in Bottisham and Swaffham-fens.”— Rev. L, Jenyns. Sp. 9. scitulus. Prats XI. £3. Niger, thorace ad marginem utrinque macula Serrugined, elytris maculis strigisque aliquot irregularibus flavo-testaceis. Long. corp. 1$—13 lin.) © Dy. scitulus. Spence MSS.—Hyg. scitulus. Steph. Catal. p. 44. No. 437. Black: head deeply but distinctly punctate; with two larger impressions be- tween the eyes: thorax thickly punctate, the disc rather elevated transversely : elytra thickly and finely punctate, the lateral margin irregularly pale tes- taceous, branching off first obliquely at the base, towards the angle of the suture, where it again turns backward parallel with the suture; secondly, beyond the middle, nearly at right angles, and waved; thirdly, short and . obliquely, near the apex: body opaque, black beneath, thickly punctulate: legs ferruginous ; the posterior pitchy-black. I believe this is synonymous with the Hy. lepidus of De Jean ; but it is different from the Hy. lepidus of Schonherr, as may be readily observed by a com- parison of his figure with the one given in this work. Common near London. “ Ireland, Devonshire, and near Car- lisle.’— Dr. Leach. ‘* Wandsworth-common and Copenhagen- fields.”— Mr. Ingpen. Sp. 10. pictus. Piceo-ferrugineus, elytris pallidis, sutura maculé oblongd disci, striique submarginali nigris. (Long corp. ?—1+ lin.) Dy. pictus. Fabricius.—Hyg. pictus. Steph. Catal. p. 44. No. 438. Black, finely punctulated, the elytra with a few minute hairs; head pitchy- ferruginous, with a shallow impression on each side between the eyes: thorax slightly convex, pitchy-black, the lateral margin rufescent, with an abbreviated curved striola on the inner edge: elytra very convex, pale-yellow, with the suture, an oblong discoidal spot, and a stripe on the lateral margin black, leaving a flexuous stripe, dilated at each extremity, of the former hue upori the disc of each: body pitchy-red or ferruginous beneath: legs elongate, pitchy-red: antenne with the base pale rufous, the apex dusky. Var. &. Steph. Catal. 1. ce. With the suture and a broad common fascia behind black. ManpiBu ata. Vot. II. Isr Avec. 1828. E 50 MANDIBULATA.—COLEOPTERA. Frequently met with in ditches and streams near London, Hert- ford, Ripley, &c.: also in South Wales and Norfolk. “ Common at Bottisham.”—Rev. L. Jenyns. ‘ Wandsworth-common and Copenhagen-fields.”—Mr. Ing pen. Grenus LX XX].—Hyproporuws, Clairville. Palpi, external maaillary with the terminal joint sub-cylindric, truncate: labrum minute: mandibles slightly emarginate at the apex, and denticulated inter- nally towards the base: mentum tridentate. Antenne with the two basal joints elongate, the remainder nearly equal in length: head broad, gibbous ; body oval, rather depressed, broader than high: elytra ovate: legs slender ; the four anterior tarsi with four, the two posterior with five joints ; all didactyle. es This genus, which consists of several closely approximating species, may be known from Hygrotus by the truncate terminal joint of the external maxillary palpi, by the depressed body, which is broader than high, by the slighter emargination at the apex of the mandibles, and by the nearly equal length of the nine last joints of the antenne: from Noterus and Laccophilus it is distin- guished by the fcur anterior tarsi possessing four joints only. From its extent, I have subdivided the genus into sections, in order to facilitate the investigation of the species. A. With the sides of the thorax rounded. a. Elytra with the apex dentate. Sp. 1. frater. Pratre XI. f. 4. Oblongo-ovatus, niger, thorace flavo baseo medio macula biloba nigra, elytris limbo, maculis lineisque flavis. (Long. corp. 18—2 lin.) : Dy. frater. Spence MSS.—Steph. Catal. p. 45. No. 439. Oblong-ovate, convex, black beneath; above rusty-testaceous, rather opaque, very finely punctulated: thorax with a faint dusky margin anteriorly, and a large geminated black spot at the base in the middle; elytra with the suture, and several regular longitudinal lines, black; the apex obliquely truncate, with the outer angle denticulated: legs and antenne ferruginous, the latter dusky at the tip. Var. 6. With the body entirely ferruginous beneath, or black, with the mar- gins of the abdominal segments testaceous-red. Not very common: found in ditches and rivulets in Norfolk, Suffolk, Yorkshire, and occasionally near London. “ Near Carlisle, in rivulets.”—Dr. Leach. “ Netley, Salop.”—Rev. F. W. Hope. « Whittlesea Mere.” — Messrs. Chant and Bentley. DYTICID®.—HYDROPORUS. 51 Sp. 2. areolatus. Oblongo-ovatus, subdepressus, pallidus, thorace nigro bipunctato, elytris pallido nigroque lineatis. (Long. corp. 1? lin.) Dy. areolatus. Duftschmid.—Hyg. areolatus. Steph. Catal. p. 45. No. 440. Oblong-ovate, rather depressed, beneath pitchy-black, above pale, slightly pubescent ; the thorax rounded anteriorly, the sides margined, with an im- pression towards the base, the latter with two black spots: elytra with the suture and several irregular lines on the disc black: legs and antenne fer- ruginous. Var. 6. With the body beneath rusty-testaceous. “In the north of England.”—Dr. Leach. “In running streams, Bottisham.”—Rev. L. Jenyns. “Netley and Tradesley, Salop, rare.” —hev. F. W. Hope. Sp. 3. depressus. Oblongo- ovatus, subdepressus, ferrugineus, thorace maculd haseos gemini elytrorumque suturd, lineisque disct irregularibus. Long. corp. 1j—2 lin.) Dy. depressus. Fabrictus.—Hyd. depressus. Steph. Catal. p. 45. No. 441. Obleng-ovate, slightly depressed, pale ferruginous, finely punctulate and slighily pubescent: head large, rather dusky on the posterior margin: thorax a little convex on the disc, the anterior and posterior margins with a very narrow black edge, the latter with two small angulated, or rounded, spots: elytra a little convex, pale testaceous, the suture, and several irregular lines on the disc, black, leaving an unequal margin of a pale hue, and two dorsal spots on each elytron, the latter placed one behind the other; the tip of the elytra is obliquely truncate, the outer angle having a powerful dentation: legs and antenne pale ferruginous. The form of the lines and spots on the elytra varies considerably ; in some specimens the former are sometimes confluent. “‘ Brooks near Oxford."—Rev. F. W. Hope. “ River Avon, Salisbury, in July.°—Mr. Ingpen. “ In running streams, Bottis- ham, in company with the last.”—Rev. L. Jenyns. b. Elytra not dentate at the apex. Sp. 4. duodecim-punctatus. Oblongo-ovatus, pallide ferrugineus, thoracis lateribus rotundatis, basi maculé bilobéd nigré, elytris nigris, maculis sex ferrugineis. (Long. corp. 24—34 lin.) Dy. 12-punctatus. Fabricius.—Don. xiv. pl. 496.—Hyd. 12-punctatus. Steph. Catal. p. 45. No. 442. The largest of this genus; of a pale ferruginous, obsoletely strigulated: head, with the region of the eyes, and its posterior margin, dusky: thorax, with the lateral margins, rounded anteriorly ; the anterior with a broad black border in the middle, and the posterior also with a black edge, which is anteriorly produced into two lobes in the middle: elytra slightly convex, black, each with six pale spots, three parallel with the suture, and three on the margin: body pale ferruginous beneath: legs and antenne the same. E2 52 MANDIBULATA.—COLEOPTERA. The size and form of the spots on the elytra vary greatly, and they are some~< times slightly confluent. Rare near London, but more frequent in some of the distant eounties. ‘* In Devonshire, and near Carlisle.’”—Dr. Leach. “« Very abundant at Netley, Salop.”—Rev. F. W. Hope. ; Sp. 5. consobrinus. Oblongus, subtis niger, supra pallide-testaceus, nitidus, punctatus, maculé thoracis rhombed, elytrorum bast, suturd lineisque 5 nigris. (Long. corp. 24 lin.) Hy. consobrinus. Kunzé.—Steph. Catal. p. 45. No. 443. Oblong, beneath black ; above pale testaceous, shining, punctate ; thorax with a central rhomboidal black spot: the elytra, with the base, suture, and five regular longitudinal lines black, the lateral ones somewhat interrupted: legs and antenne rusty-testaceous. ) Not common; found occasionally near London. Sp. 6. nigro-lineatus. Oblongo-ovatus, subtius niger, supra pallidée ferrugineus, thorace macula discoidali parva, elytrorum suturd lineisque 4 abbreviatis, nigris. (Long. corp. 24 lin.) Hyp. nigro-lineatus. Schonherr 2—Hyd. nigrolineatus. Steph. Catal. p. 45. No. 444. Oblong-ovate, beneath black ; above pale ferruginous: head, with the nape and eyes, black: thorax with a small round black dot in the centre: elytra pale, with the suture and four distinct lines black, the outer one remote from the margin, and none of them reaching the apex; towards the suture is a single impressed strie: legs ferruginous. *«¢ Near Kean’s Cottage, Isle of Bute.”"—J. C. Dale, Esq. Sp. 7. lineatus. Oblongo-ovatus, subtis niger, supra pallidé testaceus, opacus, subtilissime punctatus, macula magni thoracis rhombed, elytrorum bast, suturd lineisque nigris. (Long. corp. 2}—23 lin.) Dy. lineatus. Marsham.—Hy. lineatus. Steph. Catal. p. 45. No. 445. Oblong-ovate, beneath black, above pale testaceous, opaque, finely punctulated : head with an oblique black streak on each side between the eyes: thorax with a large discoidal rhomboid black spot: elytra, with the base, suture, and five lines on the disc black; the first and third from the suture not reaching to the base; the fourth interrupted beyond the middle; the fifth very short, in the middle of the margin ; the four inner ones more or less confluent at the apex: legs and antenne ferruginous, the latter palest. Rare: found near London, as well as in distant parts; near Nor- wich, Ipswich, &c. “Netley, Salop.”— Rev. F. W. Hope. ““ Wands- worth Common.”—Mr. Ingpen. Sp. 8. picipes. Oblongo-ovatus, subius niger, supra ferrugineo-testaceus, nitidus, grossé profundéque punctatus, capitis thoracisque bast linersque elytrorum nigris, striis 6 haseos coleopterorum punctatis. (Long. corp. 23 lin.) Hy. picipes. Kunzé.—Steph. Catal. p. 45. No. 446. DYTICIDA.—HYDROPORUS. 53 Gblong-ovate, beneath black, above rusty-testaceous, glossy, coarsely and deeply punctate: head with a bilobate dusky-black posterior margin: thorax punc- tulate, with its anterior margin dusky, its posterior blackish; within the latter a transverse series of deep impressions ; elytra very deeply punctate, dusky, with the suture and four parallel lines on each, black, and a short streak of the same colour on the margin towards the apex; at the base are six deeply punctated strie, and aslighter one on each side of the suture: legs bright rufo- ferruginous: antenne testaceous, annulated with black towards the apex. More abundant than the three preceding species, but neverthe- less somewhat uncommon; found occasionally near London, in Norfolk, Devonshire, and near Swansea. “ Southend, rare, and Netley, Salop.”—Rev. F. W. Hope. + Sp. 9. alternans. Oblongo-ovatus, subtis niger, supra ferrugineus, opacus, subtilitér punctatus, capitis maculis duabus, thoracis macula ad basin trans- versa, elytrorumque lineis nigris, striis 4 baseos coleopterorum punctatis obso- letis. (Long. corp. 24 lin.) Hy. alternans. Kunzé.—Steph. Catal. p. 45. No. 447. Oblong-ovate, beneath black, above ferruginous, opaque, very finely punctu- lated ; head with two black spots: thorax with a transverse black spot on the hinder margin: elytra dusky, with the suture and four parallel lines _ black, finely punctate, with four obsoletely punctate strie at the base: legs ferruginous. In the British Museum. * Taken in Ulswater Lake.”—Dr. Leach. Sp. 10. dorsalis. Oblongo-ovatus, niger, pubescens, thoracis margine fascidque interrupt, elytrorum puncto baseo, margineque inequaliter ferrugineis. (Long. corp. 2—2? lin.) Dy. dorsalis. Fabricius.—Hy. dorsalis. Steph. Catal. p. 45. No. 448. Black, pubescent, thickly punctulate and pubescent: head rufo-ferruginous, with a deep impression on each side in front: thorax transversely convex in the middle, black, the sides broadly ferruginous, sometimes with an interrupted fascia behind the middle: elytra moderately convex, black, the lateral margin more or less ferruginous, with a spot at the base, and a streak towards the apex of the same colour; towards the scutellum, at the base of the elytra, is also a spot, differing in size, of a deeper hue, which is occasionally deficient : body pitchy-ferruginous beneath, with the apex obscure, entirely punctu- lated: legs and base of the antenne ferruginous; the apex of the latter dusky. Var. 6. Steph. Catal.1.c. Elytra with the lateral margins alone slightly fer- ruginous. Var. y. Thorax with a round ferruginous spot within the margin, a similar one near the base of the elytra, and the margin of the latter ferruginous. The size and shape of the maculations vary considerably. Not 54 MANDIBULATA.—COLEOPTERA. uncommon in several places near London, and in Norfolk. ‘ Ken- sington-gardens.”—Fev. /. W. Hope. “ Wandsworth-common.” —Mr. Ingpen. “Near Ely, occasionally.”—Rev. L. Jenyns. Sp. 11. alpmus. Piarr XI. f. 5. Oblongo-ovatus, subdepressus, subtis nigro-= piceus, supra pallidus, glaber, thorace subquadrato, utrinque lineold impresso, nigro maculato, elytris subacuminatis, suturaé lineisque disct subregularibus nigris. (Long. corp. 13—1¢ lin.) Dy. alpinus. Paykul 2—WSteph. Catal. p. 46. No. 449. Oblong-ovate, rather depressed; pitchy-black beneath, above pale testaceous, smooth: head with the forehead flavescent, the vertex rufescent: thorax with the anterior edge dusky; the disc with two interrupted. transverse short black lines, bounded on either side with a deep, short, slightly curved, impressed striola, parallel with the lateral margin: elytra flavescent, subacuminated, with the suture, and about eight lines, biack; the six inner parallel and unbroken ; the seventh interrupted, leaving two large patches of the yellowish ground exposed ; the eighth short, parallel with, and about the middle of the margin: some of the inner lines are obliquely turned up towards the base ; and occasionally they become confluent, or obliterated ; legs pale ferruginous: breast thickly punctulate. Taken abundantly by Dr. Leach in the north of England, and in Devonshire. ‘ Common in brooks, Netley, Salop.”—Rev. F. W. Hope. Sp. 12. sex-pustulatus. Oblongo-ovatus, niger, pubescens, capite, thoracis laterihus pedibusque rufis, elytris lituris tribus lateralibus rufo-griseis. (ong. corp. 12—2@ lin.) Hy. sex-pustulatus. Mabricius.—Hy. 6-pustulatus. Steph. Catal. p. 46. No. 450. Oblong-ovate, black, pubescent, the superficies thickly punctulate: head rufous, with a dusky spot before each eye: thorax black, the disc convex, the lateral margins broadly rufo-testaceous: elytra oblong-ovate, black, a little glossy, more or less spotted on the margins with griseous, usually with a large spot at the base, united by a yellowish streak with the shoulder; the margin beyond the middle pale, behind this another pale spot, varying in size, anteriorly dilated, waved, and posteriorly acuminated ; sometimes small, linear ; towards the apex a third small, lunate, transverse spot, frequently connected with the - second: body black, and slightly punctate beneath: legs rufo-ferruginous: antenne rufous, dusky at the tip. Var. @. Steph. Catal. 1.c. Elytra with two spots on each, one at the base, the other, less, at the apex. Var. 4. Steph: Catal. 1.c. Of a rufescent colour above: probably immature. The colour, form, and number of spots on the elytra vary greatly. One of the most abundant species of the family in Britain, occur- DYTICIDA.—HYDROPORUS. 55 ring in every brook, rivulet, &c. throughout the metropolitan di- strict. * Wandsworth-common.”— Mr. Ingpen. “ Very plentiful throughout Cambridgeshire.”—Rev. L. Jenyns. Sp. 13. proximus. Niger, opacus, capite anticé, lateribus thoracis, pedibusque Serrugineis; elytris macula apicali pallida. (Long. corp. 12 lin.) Hy. proximus. Wilkin MSS.?—Steph. Catal. p. 46. No. 451. Black, opaque: the head anteriorly, and the sides of the thorax, ferruginous: the elytra black, with a pale arcuated spot towards the base: the legs fer- ruginous. | I conceive that this insect (which I first obtained from the late Mr. Griffin’s collection, by the above name) may be a mere variety of the foregoing: the original specimen is in Mr. Vigors’ cabinet. Near Norwich. “ Arran, and near Spitehweek, Devonshire.” — Dr. Leach. Sp. 14. tristis. Oblongo-ovatus, subconverus, angustior, niger, glaber, capite elytrisque rufo-piceis, antennarum basi pedibusque ferrugineis. (Long. corp. 14—1} lin.) Dy. tristis. Paykul.—Hy. tristis. Steph. Catal. p. 46. No. 452. Oblong-ovate, subconvex, black; the entire surface beneath a strong gloss, thickly and finely punctulate: head large, depressed, pitchy-red, with a dusky patch between the eyes: thorax convex in the middle, anteriorly and poste- riorly impressed, thickly punctate, slightly glossy : elytra ovate, a little convex, shining pitchy-red, sometimes pale testaceous-red : body pitchy-black beneath, rather deeply punctate: legs rusty-red: antenne with the base ferruginous: the apex dusky. The colour of the thorax is sometimes pitchy-red. Found near London. “ Kensington-gardens.”—Rev. F’. W. Hope. Sp. 15. umbrosus. Oblongo-ovatus, subconvexus, niger, pubescens, capite pedi- busque rufis, elytris rufo-piceis, posteriis attenuatis. (Long. corp. 1—1+ lin.) Hyp. umbrosus. Gyllenhal—Hyd. umbrosus. Steph. Catal. p. 46. No. 453. Minute; oblong-ovate, subconvex, black, pubescent ; beneath a powerful lens thickly punctulate: head large, rounded, depressed, rusty-red, frequently with a dusky cloud between the eyes: thorax transversely convex on the disc, with a deep waved impression behind, slightly glossy: elytra oblong-ovate, above a little convex, dull pitchy-red, pubescent ; body slightly glossy beneath, black, punctulated: legs elongate, pale rufescent: antenne the same, with the tip black. Taken near London, but rarely. B. With the sides of the thorax in coutinuity with those of the elytra. a. With the tip of the elytra somewhat truncate. 56 MANDIBULATA.—COLEOPTERA. Sp. 16. rufifrons. Ovatus, subconvexus, piceo-niger, nitidus, profund? punctatus, capite anticé, elytrorum margine pedibusque ferrugineis. (Long. corp. 2 lin.) Dy. rufifrons. Duftschmid.—Hyd. rufifrons. Steph. Catal. p. 46. No. 454. Ovate, subconvex, shining, pitchy-black, deeply punctate: the head finely punctate, anteriorly ferruginous: thorax unequal, the margins thickly punc- tate, the disc rather elevated, slightly punctate; the lateral margin faintly rufescent: elytra very glossy, thickly punctate ; the base and lateral margins more or less ferruginous, and the colour more or less distinct: body beneath glossy black, thickly and deeply punctate: legs deep ferruginous: antennz the same, with the terminal joints belted with dusky. I have hitherto only met with this insect in the neighbourhood of London. “ Wandsworth-common.”—Mr. Ingpen. “ Netley, Salop.”—Rev. F'. W. Hope. Sp. 17. marginatus. Oblongo-ovatus, piceo-niger, pubescens; capite, thoracis lateribus pedibusque, ferrugineis. (Long. corp. 2 lin.) Hyd. marginatus. Kunzé. Steph. Catal. p. 46. No. 455. Oblong-ovate, pitchy-black, pubescent: head shining, ferruginous, with a dusky spot on each side near the eyes ; sometimes confluent, and two impressed dots between: thorax a little convex, unequal, anteriorly and posteriorly im- pressed transversely, black, punctate, the lateral margins ferruginous: elytra oblong-ovate, slightly convex, finely and thickly punctate, slightly pubescent, rusty-black, with the margins paler at the base: body beneath glossy rusty- black, subpunctate: legs and antenne ferruginous, the latter dusky at the apex. Gyllenhal’s insect appears, from his description, to be of a deeper hue: I have hitherto seen three or four indigenous specimens only, all of which are of a rufescent or rusty-black. Once taken by myself near London. I have a second example, but am not aware of its locality. ‘ Ulswater Lake, twice captured.” Dr. Leach. Sp. 18. deplanatus. Ovatus, planus, piceo-niger, opacus, subtilissimé punctu= latus, tenué pubescens, capite anticée, thoracis lateribus, elytrorum bast mar= gineque pedibusque ferrugineis. (Long. corp. 2 lin.) Hyp. deplanatus. Gyllenhal—Hyd. deplanatus. Steph. Catal. p. 46. No. 456. Ovate, flat, pitchy-black, opaque, slightly pubescent, finely punctate ; head ante- riorly ferruginous, with a dusky curved line near each eye: thorax very short, the base deeply sinuated ; above depressed, black, opaque, the lateral margin obscure, ferruginous: elytra slightly convex, nearly flat, pitchy-black, opaque, finely punctulate, and slightly pubescent ; the shoulders, more or less, and the lateral margins, beyond the middle, ferruginous : body beneath pitchy- black, rather glossy, obscurely punctate: legs and antenne ferruginous, the latter with the ttps dusky. N DYTICID@&.— HYDROPORUS. 57 [ have a pair of this species, which I captured in a ditch near the junction of the Surrey and Croydon Canals. b. With the elytra not truncate at the apex. Sp. 19. Scalesianus. Rufo-ferrugineus, elytris saturatioribus, punctulatis, subtis niger ; antennis pedibusque rufo-testaceis. (Long. corp. ? lin.) Hy. Scalesianus mzhi. Steph. Catal. p. 46. No. 457. Minute, rufo-ferruginous: head with an impression on each side in front: thorax with the disc slightly elevated transversely, the posterior margin thickly punctulated: elytra deep-ferruginous, inclining to castaneous, the outer mar- gin palest, finely and rather thickly punctulate throughout: body glossy- black beneath, thickly and rather strongly punctate: legs and antenne rufo- testaceous, the latter palest. Of this insect I have as yet seen but a pair, which were captured by the late R. Scales, Esq., in Norfolk, who kindly supplied me with one of the specimens, and to whom I dedicated the species long since. Sp. 20. unistriatus. Ovatus, niger, thorace fascia pallidé striolisque duabus coleoptris communibus, elytris plagd obsoleté rufescente. (Long. corp. ?—1 lin.) : Dy. unistriatus. I/iger.—Hyd. unistriatus. Steph. Catal. p. 46. No. 458. Minute: ovate, black, punctulated: head pitchy-brown, scarcely punctulated : thorax transversely testaceous in the middle, the anterior and posterior mar- gins dusky, with an oblique impressed line on each side at the base: elytra ovate, much attenuated posteriorly, above convex, rather deeply punctulate, pitchy-black, with an undefined, obsolete, rufescent patch on each, near the shoulder ; in the middle of the base an abbreviated, deeply-impressed striola, in continuity with the one on the base of the thorax; and, parallel with the suture, a rather faint stria, scarcely reaching to the apex: body pitchy-black beneath, deeply punctate: legs ferruginous; tarsi obscure: antenne ferru- ginous at the base, black towards the tip. Not very abundant in the neighbourhood of London; more fre- quent in Devonshire. “ Kensington-gardens.”— Rev. F. W. Hope. Sp. 21. geminus. Oblongo-ovatus, niger, thorace fascia pallida striolisque duabus impressis in elytris continuatis, coleoptris fascia dentata margineque pallidis. (Long. corp. 1—14 lin.) Dy. geminus. Fabricius—Hyd. geminus. Steph. Catal. p. 46. No. 459. Minute, oblong-ovate, black: head piceous: thorax pale-testaceous, shining, finely punctulated, the anterior margin dusky in the middle, the posterior with a large transverse dusky-black patch, terminating on each side in an oblique, deeply-impressed striola, which is carried on to the base of the elytra ; the latter are finely punctulated, glossy-black, with an irregular pale fascia before the middle, a semi-ovate spot behind the middle, and a triangular one, 58 MANDIBULATA.—COLEOPTERA. both pale, within the apex ; the margin is also pale; near the suture is a faint stria, reaching to the apex: body glossy pitchy-black beneath, slightly punc- tate: legs pale-ferruginous. ; The markings on the elytra vary much: the anterior fascia is frequently divided into three spots, of which the marginal one is largest and quadrate, the inner slender, wedge-shaped; the other spots are sometimes united to the pale margin. Taken sometimes near London: in ponds on Wimbledon-com- mon, and in Coombe-wood. ; Sp. 22. minimus. Ovatus, niger, elytris apice lineisque tribus pallidis; pedibus rufis. (Long. corp. 3—1 lin.) Dy. minimus. Scopoli?—Hyd. minimus. Steph. Catal. p. 47. No. 460. Ovate minute ;, ovate black: elytra with a submarginal pale line, and two at the base: the legs rufous: the antenne dusky at the base. Probably a mere va- riety of the foregoing. Found occasionally near London, and in Devonshire. “ South- end.”’—Rev. F. W. Hope. Sp. 23. granularis. Oblongo-ovatus, niger, subpubescens, elytrorum margine lineis duabus pallidis, antennarum bast pedibusque testaceis. (Long. corp. | 3] lin.) Dy. granularis. Linné.—Hyd. granularis. Steph. Catal. p. 47. No. 461. Minute; oblong-ovate, black, punctulated, slightly pubescent : head glossy black ; thorax shining black, the lateral margins generally pitchy-testaceous, with an abbreviated impressed striola on each side within: elytra ovate, each with a slight pale line in the middle, broadest anteriorly, another commencing at the shoulder, angulated and obliquely bent towards the apex, where it becomes recurrent ; in the margin is also a pale abbreviated streak: body pitchy-black or ferruginous, beneath punctulated: legs ferruginous ; the tarsi and posterior tibie dusky: antenne pale at the base, black at the apex. Not very common: found occasionally in ponds and rivulets near London. “ River Cam, Cambridge.”—J. C. Dale, Esq. ‘ Netley, Salop.”—Rev. F. W. Hope. Sp. 24. ovalis. Oblongo-ovatus, subacuminatus, ferrugineus, pubescens, elytris pallidioribus lineis quatuor fasciis. (Long. corp. 15;—1? lin.) Dy. ovalis. Marsham.—Hyd. ovalis. Steph. Catal. p. 47. No. 462. Oblong-ovate, ferruginous, slightly pubescent, punctulated: head and thorax shining, the latter with its anterior and posterior margins a little dusky: elytra attenuated towards the apex, opaque, with the suture and four lines fuscous, and an oblique stripe of the same colour on the margin: body pale ferruginous beneath, punctulated: legs and antenne pale ferruginous. DY'TICIDE.——HYDROPORUS. 59 Var. p. The elytra dusky, with obsolete ferruginous lines, with the outer mar- gin of the latter colour: it also varies in the intensity of the lines on the elytra, which are sometimes deeper and sometimes nearly obliterated. Not uncommon in ponds and ditches in the vicinity of London; in Battersea-fields, the New River, and also in Norfolk. “Ina ditch at Crosby, near Carlisle."—Dr. Leach. ‘ Turf pits in Bot- tisham and Swaffham-fens.”—Rev. L. Jenyns. ‘ Kensington- gardens.” —ev. f. W. Hope. Sp. 25. nigrita. Oblongo-ovatus, subdepressus, niger, pubescens, antennarum basi pedibusque rufis, elytris strid disci punctatd. (Long. corp. 1? lin.) Dy. nigrita. Fabricius—Hyd. nigrita. Steph. Catal. p. 47. No. 463. Oblong-ovate, slightly depressed, black, pubescent, very finely punctulate: head broad, the margin of the vertex ferruginous: thorax slightly convex, totally black: elytra broad, ovate, depressed, black, more or less pubescent, with a very obsolete punctate stria on the disc, and sometimes another towards the margin: body beneath pitchy-black, shining, rather deeply punctate: legs ferruginous-red, with the hinder thighs pitchy at the base. Found occasionally in stagnant waters near London. “ Netley, Salop."—Rev. F. W. Hope. Sp. 26. trivialis. Ovatus, subconverus, niger, subpubescens, thorace disco sublevi, margine postico elytrisque punctutis, pedibus piceis. (Long. corp. 14 lin.) Hyd. trivialis. Spence MSS.?—Steph. Catal. p. 47. No. 464. Ovate, rather convex, black, slightly pubescent: head pitchy: thorax with the disc transversely convex, nearly smooth, the posterior margin rather thickly and strongly punctate: elytra somewhat convex, a little attenuated towards the apex, thickly and rather strongly punctate throughout: body deep black beneath, punctulated: legs pitchy: antenne rufo-piceous at the base, dusky towards the apex. : Not common: found near London, and in Yorkshire. “ South- end.”— Rev. F. W. Hope. Sp. 27. minutus. Oblongo-ovatus, subdepressus, niger, pubescens, lateribus thoracis pedibusque piceo-ferrugineis, antennarum basi ferrugined. (Long. corp. 14 lin.) Hyd. minutus mihi.—Steph. Catal. p. 47. No. 465. Oblong-ovate, subdepressed, black, pubescent: head with the frontal foves very deep: thorax with a transverse impression behind, the disc rather convex, smooth, the hinder margin punctate, the lateral margins deep pitchy-ferru- ginous: elytra pubescent, obsoletely punctulate, with a faint elevated carina on each towards the suture: body deep black beneath, the base of the abdomen and the plure rather deeply punctate: legs pitchy-ferruginous: antenne with the base ferruginous, the apex rather dusky. 60- MANDIBULATA.—COLEOPTERA. Found occasionally near London. “ Southend, and Netley, Salop.”—ev. EF. W. Hope. Sp. 28. planus. Oblongo-ovatus, depressus niger, pubescens, tibiis solis rufis. (Long. corp. 14 lin.) Dy. planus. Marsham.—Hyd. planus. Steph. Catal. p. 47. No. 466. Minute; oblong-ovate, depressed, pubescent, black: elytra rather pale at the _ base, obsoletely punctulate; with a very faint abbreviated stria in the middle of the base ; beneath pitchy-black: the legs pitchy, with the tibie alone rufous. Probably a variety of one of the foregoing ; to Hy. trivialis it approximates most closely, but its form appears dissimilar. The above description drawn from the Marshamian specimen, which I believe was taken near London. Sp. 29. melanocephalus. Oblongo-ovatus, subconvexus, niger, glaber, antennarum basi ferrugined, pedibus piceis. (Long. corp. 14—1$ lin.) Dy. melanocephalus. Marsham.—Hyd. melanocephalus. Steph. Catal. p. 47. No. 467. Oblong-ovate, subconvex, black, glabrous, very finely and faintly punctulate throughout: head with the margin of the crown pitchy-red: thorax trans- versely convex, nearly smooth, anteriorly and posteriorly impressed, entirely glossy black: elytra oblong-ovate, moderately convex, glossy black, imma- culate: body beneath shining black, sparingly punctate: legs pitchy-black, with the joints dull testaceous: antenne ferruginous at the base, black at the apex. Var. 6. With the elytra and legs dull pitchy-red ; the elytra dusky on the back: probably immature. Extremely abundant in ponds and rivulets throughout the me- tropolitan district, and in Norfolk. ‘ Frequent in ditches near Ely, and elsewhere in Cambridgeshire.”— Rev. L. Jenyns. Sp. 30. erythrocephalus. Oblongo-ovatus, convexior, niger, pubescens, capite pedibusque rufis, thoracis elytrorumque margine obscuré ferrugineis. (Long. corp. 14—1? lin.) Dy. erythrocephalus. ZLinné.—Hyd. erythrocephalus. Steph. Catal. p. 47. No. 468. ! Oblong-ovate, rather convex, black, pubescent, finely punctulate: head rufo- ferruginous, with a dusky cloud between the eyes: thorax obscure black, the lateral margins more or less ferruginous: elytra a little glossy, pubescent, rather strongly punctate, with the shoulders and lateral margin somewhat tes- taceous: body beneath shining black, punctulated: legs elongate, entirely rusty-red: antenne testaceous at the base, dusky at the apex. This is likewise very common in the vicinity of London. “ Found with the last.”——Rev. L. Jenyns. DYTICIDA.—HYDROPORUS. 61 Sp. 31. flavipes. Ovatus, subdepressus, niger, pubescens, elytris fuscis basi mar- gineque testaceis, pedibus pallidé ferrugineus. (Long. corp. 14—1$ lin.) Dy. flavipes. Fabricius.—Hyd. flavipes. Steph. Catal. p. 47. No. 469. Ovate, slightly depressed, black, pubescent, thickly but finely punctulate: head with two deep frontal impressions: thorax with the disc transversely convex : elytra fuscous, with the base and margin testaceous: body deep glossy black beneath: legs pale ferruginous. The base and margin of the elytra are sometimes broadly testaceous. Not uncommon in stagnant waters near London, at Hertford and Ripley; also in Norfolk. ‘‘ Netley, Salop, and Southend.”—Rev. F. W. Hope. ‘* Wandsworth-common.”—Mr. Ingpen. “ Of fre- quent occurrence in ditches near Ely, and elsewhere.”—Rev. L. Jenyns. Sp. 32. ater. ‘ Ovatus, subdepressus, niger, antennis pedibusque omnino ferru- _gineis. (Long. corp. 2 lin.) Dy. ater. Forster?—Hyd. ater. Steph. Catal. p. 47. No. 470. Ovate, subdepressed, black ; with the antenne and legs entirely ferruginous. I suspect that the above is an immature state, or a variety of the following species. . Taken in pools near London. Sp. 33. holosericeus. Ovatus, subdepressus, niger, pubescens, antennarum basi pedibusque ferrugineis. (Long. corp. 2 lin.) Dy. holosericeus. Marsham.—Hyd. holosericeus. Steph. Catal. p. 47. No. 471. Ovate, slightly depressed, black, pubescent: head with the margin of the crown glabrous, ferruginous: thorax slightly convex above, and entirely black: elytra black, very pubescent, thickly punctulated, the lateral margin and base generally paler: body shining black beneath, punctulated: the legs ferru- ginous: antenne ferruginous at the base, the tip dusky. Very common near London; also found in Norfolk. “* Wands- worth-common.”—Mr. Ingpen. “ Frequent in ditches near Ely, and elsewhere.” —Rev. L. Jenyns. Sp. 34. pubescens. Ovalis, planus, niger, pubescens, antennarum basi pedibusque ferrugineis, elytris testaceis, strid disci punctatd. (Long. corp. 13—2 lin.) Hyp. pubescens. Gyllenhal.—Hyd. pubescens. Steph. Catal. p. 48. No. 472. Oval, flat, black, very pubescent, finely and thickly punctate: head ferruginous towards the crown: thorax anteriorly and posteriorly impressed transversely : elytra ovate, much depressed, deep testaceous, much punctulated, and strongly pubescent, the disc with an abbreviated stria of larger impressions: body pitchy-black beneath, rather deeply punctulated: legs ferruginous, the femora sometimes dusky: antenne ferruginous at the base, blackish at the apex. 62 ; MANDIBULATA.—COLEOPTERA. Frequent near London, and in Norfolk. ‘ Wandsworth- common.”—Mr. Ingen. Sp. 35. fuscatus. Ovalis, niger, subpubescens, elytris piceo-fuscis, obsolete punc- tulatis, pedibus ferrugineis, femoribus basi nigro-piceis. (Long. corp. 2 lin.) Hy. fuscatus. Kirby MSS.—Steph. Catal. p. 48. No. 473. Oval, depressed, black, slightly pubescent: head black, with a rusty streak be- hind: thorax black, immaculate, the disc slightly convex: elytra ovate, rather depressed, pitchy-brown, obsoletely but thickly punctulated: the base and lateral margin rather palest: body beneath deep shining black: legs ferru- ginous; the base of the femora pitchy-black: antenne ferruginous at the base, dusky at the apex. This is apparently the Hy. planus, var. «. of Gyllenhal, but the colour of the elytra differs. Rare: I have two specimens, which were captured near Lon- don, and one taken in Norfolk. ‘ Barham.”—Rev. W. Kirby. Sp. 36. piceus. Oblongo-ovatus, niger, vix pubescens, elytris piceis profunde punc- tatis, pedibus omnino ferrugineis. (Long. corp, 2+ lin.) Hy. piceus. Kirby MSS. Steph. Catal. p. 48. No. 474. Oblong-ovate, depressed, black, scarcely pubescent: head anteriorly rufo-ferru- ginous: thorax with the disc convex, the anterior and posterior edges with a transverse series of impressed dots, black, the lateral margins obsoletely-fer- ruginous: elytra ovate, piceous, the sides paler, deeply punctate throughout : body pitchy-black beneath, punctate: legs entirely ferruginous: antenne ferruginous at the base, dusky at the tip. Probably synonymous with Hy. planus, var. b. of Gyllenhal, but the colour of the elytra is different, and they appear more deeply punctate: the head is not black. Also rare: I possess one specimen which was caught near Lon- don, and another from the vicinity of Norwich. ‘“ Barham.”—Rez. W. Kirby. Genus LX XXII.—Norerus, Clairville. Palm, external maxillary with the terminal joint elongate-ovate, the preceding and basal one shortest ; /abial with the basal joints short, the last very large, broad, and emarginate at the apex: labrum small, rounded: mandibles deeply emarginate at the tip, with a small tooth towards the base: mentum emarginate anteriorly, with an obsolete lobe in the centre. Antenne with the fifth or seventh joint dilated, the rest simple, gradually diminishing to the last, which is acute: head rounded, convex: thorax with a triangular pro- jection in the place of the scutellum, which is wanting: body very convex, attenuated posteriorly: posterior legs subnatatorial: posterior tibie short ; DYTICID£.—NOTERUS. . 63 all the ¢arsz with five joints: males with the anterior tibis very short, stout, dentate internally. This genus is distinguished with facility from the foregoing by the incrassated joint of the antenne, the emarginate terminal joint of the labial palpi, and convex body, by which characters it also differs from Laccophilus; and from Colymbetes and the following genera it may be known by the absence of an exserted scutellum. Sp. 1. crassicornis. Ferrugineus, elytris saturatioribus, lineis tribus punctorum impressis, abdomine piceo. (Long. corp. 24 lin.) Dy. crassicornis. Fabricius.—No. crassicornis. Steph. Catal. p. 48. No. 475. Pale-ferruginous, shining: head smooth: eyes black: thorax convex, smooth: elytra very convex, as broad as the thorax at the base, then slightly attenuated towards the apex, which is rounded, of a deep-ferruginous, inclining to chestnut, with the lateral margin paler ; each has three irregular rows of im- pressions at the base: body deep-ferruginous beneath, the abdomen dusky: legs deep-ferruginous ; the male with the four anterior femora with a black ring towards the apex. Not very frequently met with; I have taken it once or twice in ditches at Battersea-fields, and on Epping-forest : it occurs in Nor- folk and Suffolk. ‘In Milden-hall drain; also in Burwell-fen, Cambs.” —-Rev. L. Jenyns. ‘* Wandsworth-common.”— Mr. Ing- pen. * Whittlesea Mere.”—Messrs. Chant and Bentley. Sp. 2. sparsus. Pirate XI. f. 6. Saturate ferrugineus, nitidus, coleoptrorum disco obscuriori, elytris punctis sparsis impressis. (Long. corp. 2—23 lin.) Dy. sparsus. Marsham.—No. sparsus. Steph. Catal. Deep-ferruginous, shining: head and thorax impunctate: elytra rather dusky, with the margin paler, the disc with impressed dots, placed in three some- what regular lines near the base, and scattered irregularly towards the apex: ‘ body ferruginous beneath: legs and antenne rufo-ferruginous. __ Var. &. The centre of the thorax and the abdomen beneath dusky or piceous. In Entomologia Britannica, the length of this insect is accidentally said to be five lines; but the identity of the species is unquestionable, from the accom- panying figure having been taken from the original specimen whence Marsham drew his description. Of more frequent occurrence than the last, and generally found in the same places: it also occurs in Norfolk; but not yet found in Cambridgeshire. “ Plentiful near Kimpton.”—Rev. G. T. Rudd. *¢ Wandsworth-common and Epping-forest.”—Mr. Ingen. 64 ' - MANDIBULATA.—COLEOPTERA. Genus LX X XIII.—Laccoruiius, Leach. Palpi, external mazillary with the first and third joints shortest, the fourth elongate, subulated : labial with the terminal joint longer than the others, rather curved, acuminated: labrum minute, emarginate: mandibles acute, dentate towards the apex: mentum bilobate. Antenne simple: head broad, gibbous: thorax triangularly produced in the centre behind, in place of the scutellum: elytra oval, slightly acuminate, a little convex: posterior legs formed for swim- ming: all the farsi five-jointed. Laccophilus bears considerable resemblance in form to Colym- betes, but the absence of a scutellum at once distinguishes it from that genus and the following, as do the simple antenne from Noterus, the five-jointed anterior tarsi from Hydroporus, Hygrotus, and Hyphidrus, and the natatorial posterior feet and depressed body from Peelobius and Haliprus. Sp. 1. minutus. Flavo-ferrugineus, elytris fuscis, basi lateribusque pallidis, thorace flavo immaculato. (Long. corp. 2 lin.) Dy. minutus. Linné?—Mart. C. pl. 33. f:13. Lac. minutus.—Steph. Catal. p. 48. No. 477. Rusty-yellow ; very glossy: head very smooth, pale-yellowish or greenish ; eyes black: thorax moderately convex, very smooth, yellowish-green immaculate : elytra slightly convex anteriorly, depressed posteriorly, obtuse, smooth, glossy greenish-yellow, with the margin and several irregular spots, one in the middle of the base, another towards the suture, emarginate on either side, an oblique one on the shoulder, and another in the middle, both connected with the mar- gin ; an oblong narrow streak toward the middle, and another at the apex: body testaceous-yellow beneath: legs yellowish ; hinder tarsi obscure. The number and size of the maculations vary considerably ; they are sometimes nearly obsolete. Taken occasionally in ponds and ditches round London: in Norfolk. ‘Near Carlisle.”—Dr. Leach. « Wandsworth-common, Copenhagen-fields, and Regent’s Canal.”—.Mr. Ingpen. “ In Mildenhall-drain, near Littleport, Cambridgeshire.”—-Rev. L. Jenyns. Sp. 2. interruptus. Ovalis, fuscus, capite thoraceque flavis, elytris virescentibus pellucidis. (Long. corp. 2 lin.) : Dy. interruptus. Punzer.—Lac. interruptus.—Steph. Catal. p. 48. No. 478. Oval, fuscous, very smooth and shining: head and thorax yellow-immaculate : eyes black: elytra greenish, pellucid, rather attenuated towards the apex, the surface beneath a lens finely but faintly and thickly punctulate, marked as in the preceding insect: body testaceous beneath ; legs pitchy-ferruginous. itis lel. WG Si C Wagstaiwr Sc London Pub by SF. Steydicrts. Lec S6 areas y one Tea thn Cae Haka Boo a eee r 4 4 \ ' a 9 : ey id Martin Mahe fo Ha a r POORER ARN EDU NPT IMMUN TE HNN (48. ae TAL ¥ vi z) ome ee ra 4 viet ae DYTICIDA.—COLYMBETES. 65 The number and size of the spots on the elytra vary much. The chief distinctions of this insect from the foregoing consist in the more acuminated elytra, and the deeper colour ; but I think it probable that both may eventually prove identical. More abundant than the last: common in ponds and ditches round London; also in Norfolk. “ Bottisham, common.”—Rev. L. Jenyns. 3 Genus LX XXIV.—CoutyvmBettes, Clairville. Palpi, external macillary with the second and third joints equal, the fourth as long as the two preceding united, with the apex obtuse: /abrum minute, rounded anteriorly: mandibles truncate, deeply emarginate at the apex: mentum tridentate anteriorly. Antenne slender, rather elongate; the second joint shortest, the third and fourth of nearly equal length: head subovate: thorax short: elytra oblong-ovate: scutellum distinct: posterior legs natato- rial: claws didactyle: tarsi five-jointed: four anterior tarsi of the males with the three first joints nearly equally dilated. Colymbetes embraces an extensive series of insects, which differ considerably in external form from each other; nevertheless their general aspect is so extremely similar, and the gradations of shape so close, that I shall not attempt to divide them into sections, but dis- pose them in accordance with their apparent affinities, commencing, agreeably to my usual practice, with those species which are nearest allied to the foregoing genus, and terminating with such as approxi- mate to the following. ‘They are usually considerably larger than any of the preceding insects of this family, and may be known by possessing an exserted scutellum, compressed posterior natatorial legs, elongated tibiz, didactyle claws, and an obtuse terminal joint to the external maxillary palpi. Sp. 1. oblongus. Prater XII. f. 1. Oblongo-ovatus, ferrugineus, subtilissimé punctulatus, occipite, pectore ventreque nigris, elytris fuscis, pallido marginatis. (Long. corp. 33—4 lin.) Dy. oblongus. Jiliger.—Co. oblongus. Steph. Catal. p. 48. No. 479. Oblong-ovate, ferruginous, finely punctulate: vertex more or Jess dusky: thorax with the disc blackish, the margins ferruginous, above rather convex, very delicately punctulate-strigose: elytra oblong-ovate, attenuated towards the apex, a little convex, finely and closely punctulate, with several strie of irre- gularly-placed deeper impressions, dusky-ferruginous, the basal and lateral margins paler: breast and abdomen beneath dark pitchy-black ; the margins of the segments paler: legs and antennz pale-ferruginous. Var. 6. With the vertex and thorax immaculate-ferruginous. Manpieutara. Vot. Il. Ist Sept. 1828. F 66 MANDIBULATA.—COLEOPTERA. Far from a common species, and rare near London; also found near Norwich, and in Suffolk. “ Whittlesea Mere and Horningsea Fen.”—J. C. Dale, Esq. ‘ Southend, and Netley, Salop.”—Rev. F. W. Hope. “ Anglesea Abbey, Cambridgeshire, not plentifully.” —Rev. L. Jenyns. Sp. 2. guttatus. Oblongo-ovatus, subdepressus, niger nitidus, antennis pedibusque rufo-piceis, elytris guttulis duabus rotundatis pallidis. (Long. corp. 4 lin.) Dy. guttatus. Paylul.—Co. guttatus. Steph. Catal. p. 48. No. 480. Rather depressed ; oblong-ovate, obsoletely but thickly and finely punctulated throughout: head large, black, smooth, pitchy; vertex with two transverse red spots: thorax black, immaculate, a little convex, with an obsolete impres- sion behind: elytra slightly dilated in the middle, above rather depressed, glossy-black, with the margin concolorous; with a round, pale, transparent spot a little behind the middle, and a second more obsolete and smaller within the apex: near the suture is a continuous stria of impressed dots, and on the dise anteriorly three regularly-punctate strie, becoming irregular and scat- tered towards the apex: body beneath immaculate glossy-black : four anterior legs pitchy-red, the posterior pitchy-black: antenne ferruginous. Sometimes met with in the metropolitan district : I have received it from Devonshire. ‘The most abundant species of Colymbetes in Salop; also near Buxton.”—Rev. F. W. Hope. ‘ Under stones in puddles, Glanville’s Wootton.”—J. C. Dale, Esq. ‘Ina run- ning stream near Ashburton, Devon, June, 1828.”—Messrs. Chant and Bentley. Sp. 3. fontinalis. Oblongo-ovatus, subdepressus, aneo-niger, antennis pedibusque piceo-nigris, elytris guttulis duabus obsoletissimis pallidis. (Long. corp. 4 lin.) Co. fontinalis. Leach, MSS.—Steph. Catal. p. 48. No. 481. Closely allied to the preceding, but more oblong and less depressed: the entire surface is very obsoletely punctulate, and of a brassy-black: head with two ? very faint rufous spots on the vertex ; the mouth black: thorax immaculate, convex: elytra convex, deep brassy-black, with a very obsolete, minute, pallid transparent spot behind the middle, and a second, still more minute and in- distinct, within the apex; the lateral margin scarcely dilated beyond the middle; the disc with three very faint strie, composed of impressed dots, placed regularly towards the base, and scattered towards the apex: body deep black beneath ; legs pitchy-black: antenna piceous, with the base palest. + Vax. 6. C. picicornis. Sturm? Deep-black above and beneath, the elytra with a very minute pale spot towards the margin; the antenne, palpi, and tarsi bright pitchy-ferruginous. The colour is sometimes pitchy above, and the antenne ferruginous. Found in Devonshire, and near Shoreham, Sussex. “ Dartmoor.” DYTICIDH.— COLYMBETES. 67 —Dr. Leach. I rather suspect that var. 6., which is in the British Museum, may be a distinct species ; its form is apparently dissimilar to that of the true Co. fontinalis: the specimen. was taken in Devonshire. | | + Sp. 4. Grapii. Obloxgo-ovaius, niger, depressus, subtilissime punctulatus, vertice lunuld medid rufo-ferrugined, thoracis augulis posticis preductis acutis. Gyll. (Long. corp. 54 lin.) Dy. Grapii. Gyllenhal—Co. Grapii. Steph. Catal. p. 51. No. 518. Oblong-ovate, the entire surface finely and thickly punctulate: head black, the mouth and margin of the forehead, and a lunule on the crown, rufo- ferruginous: antenne slender, pale rufescent: thorax very short, much sinuated posteriorly, with the hinder angles thrown back and acute; above rather convex, black, the lateral margins rusty-red: elytra large, ovate, very little dilated in the middle, rather depressed, black, opaque, immaculate, the humeral margin slightly piceous, the disc with three faint punctate strie : body pitchy-black beneath, finely strigose: anterior legs testaceous-red, the thighs beneath and base pitchy-black; the posterior pitchy-black, with the joints paler. Six indigenous examples of this insect have come beneath my notice; of which two were captured in Norfolk by Mr. Curtis, and four in Whittlesea Mere by Messrs. Chant and Bentley. Sp. 5. fuliginosus. Oblongo-ovatus, posterius attenuatus, obscuré meiallicus, flavo-marginatus, subtis ferrugineo-brunneus. (Long. corp. 5 lin.) Dy. fuliginosus. Fabricius—Dy. uliginosus. Mart. C. pl. 32. pl. 2—5.—Co. fuliginosus. Steph. Catal. p. 49. No. 485. Oblong-ovate, posteriorly attenuated ; dulli-brassy above; the surface under a deep lens finely coriaceous: head black, anteriorly ferruginous, with two more + Sp. 6. cicur. Oblongo-ovatus, niger nitidus, levis, maculé capitis thoracisque margine rufo-ferruginers, elytris flavis nigro trroratis, lineis tribus flavis. (Long. corp. 8 lin.) Dy. cicur. Fabricius—Co. levigatus. Steph. Catal. p. 49. No. 486.—Co, con- sobrinus. Curtis, v. pl. 207. Oblong-ovate, above yellowish, shining, finely and thickly punctulated: head dusky, with a rufo-ferruginous spot on the crown: thorax dusky-black, with the anterior margin dull-testaceous ; the lateral margins and an obsolete central line obscure rufo-ferruginous: elytra oblong-ovate, moderately convex, shining, pale flavescent, thickly irrorated with black, with a small patch at the shoulder, another in the middle of the base, and a slender line down the suture, also black; the disc of each with three narrow longitudinal immaculate-yellow lines, and three obsoletely-punctate striz, rather irregular towards the apex: body beneath pitchy-ferruginous, or black: legs dusky or testaceous. Ea 68 MANDIBULATA.—COLEOPTERA. or less distinct transverse reddish spots on the crown: thorax slightly con- vex, brassy-black, with the lateral margins pale-ferruginous: elytra elongate, attenuated towards the apex, above convex, dull blackish-brass, with the outer margin pale-yellowish, the disc with an obsolete punctate stria: body pitchy- ferruginous beneath, the abdomen sometimes paler: legs and antenne pale- reddish. ‘ Common in clear ditches and streams throughout the metropo- litan district: also in Norfolk, near Bristol, and in Devonshire. ‘¢Near Durseley, in Gloucestershire.”—Rev. F. W. Hope. “In streams, Bottisham, not uncommon.”—Rev. L. Jenyns. “ Glan- ville’s Wootton, and Scotland.”—J. C. Dale, Esq. ‘ Common near Andover.”—Rev. G. T. Rudd. Sp. 7. striatus. Oblongus, niger, posterius attenuatus, thorace flavescente, medic inequalitér nigro, elytris subtilissimé transversim strigosis. (Long. corp. 83— 94 lin.) Dy. striatus. Linné.—Mart. C. pl. 34. f. 27?—Co. striatus. Steph. Catal. p. 49. No. 488. Oblong, posteriorly attenuated, black: head glossy, with fine irregular abbre- viated strie ; the labrum and a broad band between the antenne yellowish, and the crown with two, more or less apparent, transverse ferruginous spots : thorax very slightly convex, throughout very faintly and irregularly strigose, The late Mr. Tuther assured me that he caught two specimens of this insect in a pond between Snaresbrook and Wanstead, in Essex, twenty years since. Never- theless, as it has neither been recaptured (although most diligently searched for, by several most indefatigable collectors and by myself, in the pond above alluded to, and in the neighbourhood), nor known to inhabit any other part of Europe, but, on the contrary, is a native of the Cape of Good Hope, whence the Rey. F. W. Hope has received specimens direct, I conceive that ‘its admission into the indigenous Fauna is questionable, especially as the former possessor of the specimens not only dealt in insects, but had, inter alia, Silpha marginata Fabricius, a species of Mygale, and some other exotic species, in his cabinet, as British. One of the specimens above referred to is in the British Museum by the MS. name elongatus of Leach ; the other in that of Mr. Vigors, by the name levigatus of Wilkin ; the specimens having been purchased at a high price by Dr. Leach and Mr. Wilkin. ¥orster, in his Century of Insects, has a Dytiscus glaber that, unless intended for a variety of Co. ater, which is barely possible, in some respects agrees with the above insect; but his description is far too concise and indefinite to de- termine the point: he says, “ Antennis setacets compressis, fuscus, elytris glabris ventre pedibusque ferrugineis. Obs. Magnitudo Dytisci striati, cui admodum simile insectum:” and the observation seems to remove it from Co. ater. DYTICIDE.—COLYMBETES. €9 testaceous-yellow, with the middle unequally black: elytra oblong-ovate, at- tenuated beyond the middle, above moderately convex, dusky-black, the margin pale griseous-yellow,‘finely and rather deeply transversely striate throughout ; each elytron with two longitudinal striz, consisting of rather obsolete impressed dots; towards the suture and the margin are also a few scattered impressions : body beneath dusky-black, rather glossy, thickly strigose: legs black, ru geedly punctate. The dise of the thorax is sometimes nearly all black, at others a narrow waved transverse band alone occurs; and the margins of the abdominal segments are sometimes ferruginous. Very common throughout the metropolitan district. ‘ Common everywhere in Cambridgeshire."—Rev. L. Jenyns. “ Wandsworth and Wimbledon commons, and Copenhagen-fields.”—Mr. Ingpen. « Kimpton.”—Rev. G. T. Rudd. “ Glanville’s Wootton.”—J. C. Dale, Esq. Sp. 8. fuscus. Brevior ovatus, supra fuscus, thorace flavescente, medio fusco-piceo, elytris subtilissimé transversim strigosis. (Long. corp. 83—9 lin.) Dy. fuscus. Linné.—Co. fuscus. Steph. Catal. p. 49. No. 487. Closely allied to the last, but rather smaller, proportionably shorter and more obtuse posteriorly: head scarcely striated, but obsoletely punctulated: thorax rather more convex than in Dy. striatus, testaceous-yellow, the disc obscurely and irregularly pitchy-brown ; the anterior and posterior margins generally pale: elytra ovate, apex obtusely rounded, rather convex, pale-fuscous; the lateral margins, and sometimes the base pale-griseous, very finely striated trans- versely throughout, with two longitudinal punctate strie: body beneath deep rather glossy black, sometimes pitchy ; delicately strigose: anterior legs tes- taceous-yellow, the base of the thighs beneath pitchy ; the posterior pitchy, with the joints paler. Taken abundantly in Whittlesea Mere by Messrs. Chant and Bentley; I have also specimens captured near London. Sp. 9. pulverosus. Prate XII. f. 2.—Ovatus, niger, supra flavicans, thorace macula medid nigra, elytris crebré nigro irroratis, striis disct punctatis. (Long. corp. 6—64 lin.) Dy. pulverosus. Knoch.—Co. pulverosus. Steph. Catal. p. 49. No. 489. ' Ovate, black, above yellowish: head posteriorly black, with two, more or less, confluent ferruginous spots: thorax above a little convex, finely rugose be- neath a strong glass, luteous, with a transverse dusky-black spot in the middle: elytra ovate, moderately convex anteriorly, rather depressed behind, yellowish ; the disc thickly irrorated with black ; the lateral margin and a narrow line on the suture immaculate-luteous ; the entire surface finely rugulose, and on each elytron three rather conspicuous punctate longitudinal lines, becoming ob- 40 MANDIBULATA.—COLEOPTERA. solete towards the apex : body deep black beneath ; the lacinie of the sternum piceous: four anterior legs yellowish, the posterior pitchy-black, with the tips of the thighs ferruginous: antenne pale. Not uncommon in various parts of England, especially near the metropolis. ‘* Copenhagen-fields and Clapham-common.”—WMr. Ingpen. Sp. 10. notatus. Ovatus, supra flavicans, thorace maculis disci nigris, elytris crebré nigro irroratis, striis nullis punctatis: femina; elytris anteriis striolis crebris abbreviatis impressis. (Long. corp. 5 lin.) Dy. notatus. Fubricius.—Co. notatus. Steph. Catal. p. 49. No. 490. Ovate, above yellowish: head smooth, anteriorly yellow, the crown black, with two transverse testaceous spots: thorax somewhat waved behind, alittle convex, very obsoletely and irregularly punctulated, yellowish, with a large transverse lack spot on the disc, more or less divided, sometimes occupying considerable space, and occasionally nearly obsolete, and the centre of the posterior margin black: elytra ovate, moderately convex, yellowish, with the disc entirely thickly irrorated with black, with the lateral margin and a narrow line down the suture immaculate; the disc has frequently three distinct slender pale streaks: the breast is black, the apex of the sternum testaceous ; the abdomen pitchy-black, with the margin of the segments and the apex pale: legs entirely yellowish. The female has the elytra thickly covered towards the base with abbreviated strie, the abdomen nearly pale, with the base and sides spotted with brown. Not very common; I have, however, frequently taken it in a pond on Wandsworth-common in April; it is found in Norfolk. “¢ Carlisle."—Dr. Leach. Southend and Aberystwith.”—Rev. fF. W. Hope. ‘ Once taken at Bottisham.”—ev. L. Jenyns. “ Whittlesea Mere.”—Messrs. Chant and Bentley. Sp. 11. exsoletus. Oblongo-ovatus, undique flavescens, thorace vix maculato, elytris nigro irroratis, striis disci punctatis. (Long. corp. 5 lin.) Dy. exsoletus. Forster.—Co. collaris. Steph. Catal. p. 49. No. 491. Oblong-ovate, flavescent: head with the crown narrowly black, with two trans- verse testaceous spots: thorax generally immaculate, sometimes with two re- mote brownish spots on the posterior edge, which are rarely connected by a dusky margin: scutellum black, with the apex testaceous: elytra oblong-ovate, moderately convex; the entire dise thickly irrorated with black, the margin and a narrow line down the suture immaculate ; each elytron has three irre- gular punctate strie: breast flavescent, with the sutures darker: abdomen — deep rusty-testaceous : four anterior legs flavescent, posterior rather testaceous. I have restored Forster's names to this and some other species, agreeably to the just practice of adopting those proposed by the first describer, although in DYTICIDE.—COLYMBETES. val my Systematic Catalogue I have unintentionally permitted them to occupy a secondary position*. This is likewise not very abundant, but occurs sometimes near the metropolis, as well as in Norfolk. ‘* Carlisle.”—Dr. Leach. *“* Pools, Netley.” —Kev. F. W. Hope. ‘ Whittlesea Mere, plen- tifully.”— Messrs. Chant and Bentley. Sp. 12. agilis. Oblongo-ovatus, supra flavicans, subtis niger, thorace anticé pos- ticeque nigro, elytris crebré nigro-irroratis, striisque disci punctatis. (Long. corp. 5—5é lin.) Dy. agilis. Fabricius —Co. agilis. Steph. Catal. p. 49. No. 492. Rather larger than the last ; oblong-ovate, above yellowish: thorax with the disc immaculate, the anterior and posterior margins in the middle with a narrow black edge: scutellum black: elytra oblong-ovate, moderately convex ; the - dise very thickly irrorated with black, the outer margin and a narrow streak down the suture immaculate, the disc of each with two longitudinal strie of impressed dots ; and the entire surface under a strong lens very finely strigose, especially in the female: body beneath black, finely strigose; sternum with the apex ferruginous; the four hinder segments of the abdomen margined with ferruginous: the four anterior legs pale, the posterior deep ferruginous, the femora beneath with an oblong dusky spot. | Decidedly rare in Britain. “ In a stream in Norfolk.”— A. H. Haworth, Esq. “ Yxeter."—Dr. Leach. “ Kensington-gardens.” —Rev. F. W. Hope. “In astream near Cambridge, once taken.” — Professor Henslow. ** Whittlesea Mere.”—M7r. Bentley. Sp. 13. adspersus. Purate XII.f. 3. Brevior, ovalis, supra flavescens, subtis niger, elytris nigro-irroratis, striis disci punctatis. (Long. corp. 5 lin.) Dy. adspersus. Fabricius.—Co. adspersus. Steph. Catal. p. 49. No. 493. Broader but not longer than Co. collaris; oval, above flavescent: head with the crown black, with two transverse testaceous spots: thorax entirely flavescent, with two very obsolete remote fuscous spots on the hinder margin, the surface very finely punctulate: scutellum pitchy-brown: elytra broad, oval, dilated towards the middle, rather convex, rather thickly irrorated with black, the outer margin and a narrow line down the suture immaculate ; on the disc are three punctate strie: the breast smooth glossy black, sternum testaceous ; ab- domen shining black, with the base, apex, and margins of the segments tes- taceous: legs entirely yellowish. * In accordance with the above, Stenolophus vespertinus, vol. i. p. 166, should be called St. lateralis, after Marsham, not St. placidus, Gyllenhal.—Marsham’s name did not recur to me at the time the observation in p. 183 was penned. 42 - MANDIBULATA.—COLEOPTERA. Also a rare species; I have one specimen which was caught in Norfolk, and another taken at Whittlesea Mere. “ Clengre, Glou- cestershire.”— Rev. I. W. Hope. Sp. 14. nebulosus. Ovatus, supra flavescens, subtus nigro-piceus, thoracis disco punctis duobus nigris, elytris nigro variis. (Long. corp. 4—4d lin.) Dy. nebulosus. Forster.—Dy. bipunctatus. Don, ix. pl. 303.—Co. bipunctatus. Steph. Catal. p. 49. No. 494. Ovate, above yellowish: head anteriorly yellow, the crown broadly black, with two transverse ferruginous spots: thorax a little convex, obsoletely punc- tulated, with two round approximating black spots on the disc: scutellum testaceous-yellow: elytra broad, ovate, a little convex, finely punctulated, pale yellowish, with several scattered dusky-black streaks; the lateral margin, a narrow line down the suture, and a large spot behind the middle of the lateral margin immaculate-yellowish ; the disc with three rather obsolete punctate strie: body pitchy-black beneath, the apex and margins of the segments fer- ruginous; the apex of the sternum also ferruginous: legs pale-testaceous. The black spots on the thorax are sometimes nearly confluent, at others almost obliterated. A very common species near London, but rather scarce north- wards; it occurs, however, in Norfolk, Whittlesea Mere, Dorset- shire, &c. “* In ponds near Cambridge, but not very common.”— Rev. L. Jenyns. “ Somewhat scarce near Kimpton.”—Rev. G. T’. Rudd. | Sp. 15. subnebulosus. Ovatus, supra flavicans, pectore piceo-niger, abdomine testaceo, thorace immaculato, elytris atro-nebulosis, punctoque pallido intra marginem. (Long. corp. 4 lin.) Co. subnebulosus. Hope MSS. Steph. Catal. p. 50. No. 495. Oval, above yellowish: head as in the last: thorax immaculate, with an obsolete fuscous cloud in the middle of the posterior margin: elytra oval, faintly clouded with dusky, with the outer margin and suture immaculate, and a large pale-yellowish spot behind the middle on the outer margin ; on each elytron are three irregular punctate strie, and several scattered impressions towards the apex: the breast is pitchy-black, the abdomen testaceous; the legs are also testaceous. My specimens of this species were taken near “ Aldborough, Suffolk.’—Rev. PF. W. Hope. Sp. 16. conspersus. Pirate XII. f. 4. Oblongo-ovatus, supra griseo-flavus, subtiis niger, capite nigro, postice maculis duabus rubris, elytris obsoletissimé nigro irroratis. (Long. corp. 4—44 lin.) Dy. conspersus. Marsham.—Co. conspersus. Steph. Catal. p. 50. No. 496. Oblong-ovate, griseous-yellow: head with the vertex broadly black, having two transverse rufous spots; thorax immaculate; elytra oblong-ovate, slightly DYTICIDA.—COLYMBETES. G3. * convex, very obsoletely irrorated with black, with the outer margin and the suture immaculate, and an indistinct paler spot on the outer edge beyond the middle; the disc has three rather obsolete punctate strie at the base, and a few scattered dots towards the apex: the body beneath shining black, with the margins of the abdominal segments testaceous: the legs are pitchy-fer- - ruginous, with the femora pitchy-black. Var. 6. With the elytra immaculate testaceous-yellow. The Dy. conspersus of Gyllenhal is synonymous with the Co. pulverosus before described. Taken sometimes near London; more frequent in the neigh- bourhood of “ Southend.”—Rev. F. W. Hope. Sp. 17. Sturmii. Ovatus, niger, subtilissimé reticulato-strigosus, thoracis late- ribus, antennis pedibusque ferrugineis, elytris fuscis pallido-marginatis. (Long. corp. 4—4¢4 lin.) Dy. Sturmii. Gyllenhal.—Co. Sturmii. Steph. Catal. p. 50. No. 497. Ovate, black, very finely reticulate-strigose: head black, with two ferruginous spots placed transversely on the crown: labrum smooth, pale ferruginous: thorax with the disc black, the lateral margins broadly ferruginous; within the base and apex a transverse line of obsolete compressed dots: scutellum pitchy: elytra large, ovate, rather convex, dusky-brown, the edges indeter- - minately ferruginous, and on each elytron three obsolete strie of minute im- pressed dots: body beneath pitchy, finely strigose, with the margins of the segments and the apex ferruginous: legs ferruginous, with the femora, espe- cially the posterior, at the base and beneath, more obscure. Var. 6. With the margins of the thorax black, the edge itself obscure ferru- ginous. Common throughout the metropolitan district, and near Bristol. Var. 6 I obtained from Devonshire. ‘ Whittlesea Mere.”— Messrs. Chant and Bentley. ‘‘ Very abundant every where in Cambridge- shire.”—Rev. L. Jenyns. ‘“ Glanville’s Wootton.”—J. C. Dale, Esq: Sp. 18. congener. Ovalis, subdepressus, niger, subtilissimé punctulato-substri= gosus, elytris fuscis, margine pallidiori, pedibus ferrugineis, femoribus nigro maculatis. (Long. corp. 3 lin.) Dy. congener. Paykul.—Co. congener. Steph. Catal. p. 50. No. 498. Oval, subdepressed, black, very finely punctulate-strigose: head black, with the mouth, labrum, and two transverse spots on the vertex, rufo-ferruginous : thorax slightly convex, glossy-black, the lateral margins above somewhat rufescent: elytra ovate, rather depressed, the back glossy dusky-black, the base and margins indistinctly pale testaceous ; each elytron with three distinct strie of impressed dots, the inner regular interiorly, the outer, and all behind, irregular and confused: body beneath pitchy-black, with the edges of the GA MANDIBULATA.—COLEOPTERA. hinder segments and the apex ferruginous: legs ferruginous, the anterior femora in the middle, on both sides, and the posterior nearly entirely black. Rare: it occurs in Suffolk; and my specimen I obtained from a Norfolk collection. Sp. 19. paludosus. Ovalis, subdepressus, niger, levis, thoracis lateribus pedi- busque ferrugineis, elytris fuscis, bast margineque pallidis. (Long. corp. 3— 34 lin.) Dy. paludosus. Fabricius—Co. paludosus. Steph. Catal. p. 50. No. 499. Oval, subdepressed, black, smooth, glossy: head black, with the mouth, labrum, and forehead, anteriorly testaceous-yellow; the crown with two transverse ferruginous spots: thorax moderately convex, glossy-black, sometimes brassy or bluish, very smooth, the lateral margins broadly rufo-ferruginous: scu- tellum testaceous: elytra ovate, punctate, as in Co. congener; but the inter- stices entirely smooth, glossy, the back dusky, the base and margins testaceous- yellow: body smooth glossy-black beneath: four anterior legs ferruginous, the base of the femora pitchy-black, the posterior piceous, with the joints ferruginous. Var. 6. Paler, with the body testaceous beneath, probably immature. Occasionally found in gently-flowing streams near London: it also inhabits Norfolk, the neighbourhood of Bristol, Swansea, and the hilly districts of Devonshire. ‘ Very abundant in September, 1825, at Netley; and at Skipton and Larden, Salop, July, 1828.” —Rev. F. W. Hope. “ Bottisham, sparingly, always in running streams.”—Rtev. L. Jenyns. ‘* Chevening, Kent, and Epping- forest.” —Mr. Ingpen. ‘* Middlemist, Dorsetshire.”—J. C. Dale, Esq. ‘ Very common near Kimpton.”—Rev. G. 7’. Rudd. Sp. 20. maculatus. Ovatus, supra niger, thorace fascid laté, elytris maculis, lineisque longitudinalibus pallidis. (Long. corp. 34—4 lin.) Dy. maculatus. Linné.—Co. maculatus. Samou, pl. 3. f- 15. Steph. Catal. p. 60. No. 500. Ovate, above black, finely punctulated : head anteriorly rufous, posteriorly black, with two transverse ferruginous spots: thorax slightly convex, pale-yellowish, the anterior and posterior margins black in the middle: elytra ovate, convex anteriorly, with three obsolete punctate stria on the disc, glossy-black, with the lateral margin pale or whitish ; near the base, internally, a whitish spot ; posteriorly bifid, the exterior branch running to the apex of the elytra; near the exterior margin two whitish spots, one before, the other behind the middle, both bifid on either side, and connected with the pale margin ; within the apex is a round spot terminating in a line on the disc: these spots vary much in size and form: body rusty-brown beneath, the apex often obscure: legs rufo-ferruginous. | Var. 8. Steph. Catal.1.c. Differs in having the spot at the base of the elytra abbreviated, and the lateral spots smaller. DYTICID®.—-COLYMBETES. 45 Var. y. Thorax with an interrupted yellowish fascia; the elytra with very small simple spots. Var. «. Thorax with an interrupted yellowish fascia; the margin of the elytra above pale. Many other intermediate varieties occur. Rare near London; more frequent in Devonshire, and near Bristol. ‘* Cherwell, Oxfordshire, Brooks, Netley; and near Bux- ton.”—fev. F. W. Hope. “In great plenty, in one running stream near Bottisham, but not elsewhere in Cambridgeshire.” — Rev. L. Jenyns. “ Glanville’s Wootton.”—J. C. Dale, Esq. “ Not uncommon near Kimpton.”—Rev. G. T'. Rudd. Sp. 21. abbreviatus. Ovatus, niger, capite rufo, elytris fascid undulata abbre- viatd baseos, maculisque duabus marginalibus pallidis. (Long. corp. 34 lin.) Dy. abbreviatus. Fabricius.—Co. abbreviatus. Steph. Catal. p. 50. No. 501. Ovate, black, finely punctulate: head smooth, obscure-rufous, with a fuscous spot on the crown: thorax posteriorly subsinuated with obtuse angles ; above moderately convex, pitchy-black, with the lateral margins irregularly fer- ruginous ; within the apex a continuous stria, and at the base another, inter- rupted in the middle, of impressed dots: elytra oblong-ovate, moderately convex, shining black, the lateral margin unequally ferruginous, the disc with three punctate lines; near the base a narrow waved, pale-testaceous, transverse fascia, united to the margin, but not reaching to the sutures; a little beyond the middle, near the margin, a duplex spot, sometimes divided, of the same colour, and within the apex a minute one: body beneath glossy- black, the segments of the abdomen and its apex margined with ferruginous: legs rufescent. The duplex spot near the middle of the margin is frequently united by a longitudinal streak to the anterior fascia, at the shoulder. I believe this species has not been found nearer to London than Windsor, and even there but sparingly; it is sometimes found in Norfolk. «* Windsor.” —Dr. Leach. “ Larden, Salop.”—Rev. F. W. Hope. “ Whittlesea Mereabundantly.”— Messrs. Chant and Bentley. Sp. 22. vitreus. Ovatus, niger, elytris levibus nigro-eneis, striis tribus simplict serie punctatis, maculd laterali didyma punctoque apicis albido fenestratis. (Long. corp. 4 lin.) Dy. vitreus. Paykul—Co. vitreus. Steph. Catal. p. 50. No. 502. Ovate, black, smooth: head generally rufo-testaceous anteriorly, with two reddish spots on the crown: thorax sinuated behind, moderately convex, slightly zeneous, with the lateral margin rusty-piceous: elytra oblong-ovate ; moderately convex, smooth, glossy, brassy-black, with the margin concolorous; a little beyond the middle, near the outer margin, is a large duplex whitish spot, and near the apex a smaller simple one, entirely bifid, and both subpellucid ; the dise of each elytron has three regular punctate strie : body beneath black, or 46 MANDIBULATA.—COLEOPTERA. piceous: legs rufo-testaceous, with the femora beneath, and the base of the - tibiee, especially the posterior, dusky. The spot on the margin of the elytra is sometimes divided in two. Not very common near London; more frequent in distant parts, especially in Glamorganshire ; and I believe not uncommon in Nor- folk. ‘* Dartmoor and Bristol.".—Dr. Leach. ‘ Bishop’s Castle, Salop, and in brooks near Hampstead.”—Rev. F. W. Hope. *“* Rare in Cambridgeshire; a single specimen met with near Bottisham.” —fev. L. Jenyns. ‘* Wandsworth-common, and Epping-forest.”—- Mr. Ingpen. * Glanville’s Wootton.”—J. C. Dale, Esq.—** In profusion near Kimpton.”— Rev. J. T. Rudd. Sp. 23. chalconotus. Oblongo-ovatus, nigro-aneus, depressus, subtilissime reti- culato-strigosus, thoracis lateribus pedibusque rufo-piceis. (Long. corp. 4 lin.) Dy. chalconotus. Jlliger.—Co. chalconotus. Steph. Catal. p. 50. No. 503. Oblong-ovate, brassy-black, depressed, very finely reticulate-strigose: head, with the mouth, and edge of the forehead, ferruginous, with two transverse rufous spots on the crown: thorax, posteriorly, slightly waved; rather convex, with the lateral margin more or less reddish-pitchy : elytra oblong-ovate, sub- depressed, immaculate blackish-brass, the lateral margins piceous ; on the sides are three rows of scattered impressed dots, most abundant towards the apex: body pitchy-black beneath: four anterior legs pitchy-red, the posterior pitchy- black. Var. 6. With the abdomen and legs rusty-red, the margins of the thorax pitchy-red. Extremely common in the spring, in ponds and ditches, round London: also found in Norfolk, Suffolk, and near Swansea. “ York- shire.”—Dr. Leach. “ Netley, abundant.”—Rev. F. W. Hope. «¢ Occurs occasionally near Bottisham, but is not plentiful.”— Rev. L. Jenyns. Sp. 24. montanus. Oblongo-ovatus, nigro-eneus, subdepressus, subtilissimeé coriaceus, thoracis lateribus concoloribus, pedibus nigro-piceis, elytris vir striatis. (Long. corp. 3 lin.) Co. montanus. Leach MSS.—Steph. Catal. p. 50. No. 504. Oblong-ovate, brassy-black, somewhat depressed, finely coriaceous: head as in the last species, but the transverse spots on the crown obsolete: thorax scarcely waved posteriorly, rather convex, immaculate brassy-black: elytra oblong- ovate, rather depressed, immaculate brassy-black, the lateral margin obscurely piceous, the disc with three scarcely visible punctate strie: body beneath pitchy-black, with the margins of the abdominal segments rufo-ferruginous : legs pitchy-black, the anterior palest. It appears to me that the above is a mere variety of Co. chalconotus, differing DYTICIDH.—COLYMBETES. 7 in being a little smaller, in wanting the ferruginous margins to the thorax, and in having the sculpture more obsolete. Found occasionally with the foregoing insect. ‘ Dartmoor.” — Dr. Leach. * Netley, Salop, in ditches."—Rev. F. W. Hope. Sp. 25. nigro-eneus. Oblongo-ovatus, obscuro-eneus, levis, ore thoracis elytro- rumque marginibus pedibusque piceo-brunneis. (Long. corp. 4—4¢4 lin.) Dy. nigro-eneus. Marsham.—Co. nigro-eneus. Steph. Catal. p. 50. No. 505. Oblong-ovate, dull brass, smooth: head with two very distinct transverse rufous spots: thorax nearly as in the two last, with the margins pitchy-brown, the elytra oblong-ovate, black-brass, immaculate, with the margins pitchy-brown, the disc with minute impressions, placed in three longitudinal lines: body beneath, legs, antenne, and mouth pitchy-brown. Var. 6. With the plure black. Not common: found near London in the spring, in ponds on Epping-forest, and Wimbledon-common. “ Aldborough, Suffolk.” —Rev. F. W. Hope. “ Scotland.”—J. C. Dale, Esq. Sp. 26. femoralis. Oblongo-ovatus, nogro-subaeneus, depressior, punctulatus, tho- racis elytrorumque laterthus dilutioribus, pedibus rufis. (Long corp. 22—3 lin.) Dy. femoralis. Paykul.—Co. femoralis. Steph. Catal. p. 50. No. 506. Small: oblong-ovate, depressed, punctulated, brassy-black: head, with the mouth, labrum, and margin of the forehead, testaceous; and two transverse spots on the crown rufous: thorax moderately convex, shining blackish-brass, with the lateral margins indeterminately testaceous-red: elytra ovate, a little convex, brassy-black, with the margins and base indeterminately paler, the disc punctulated, and also having three irregular rows of deeper impressions on each elytron, and near the suture a fourth of rather obsolete dots: body pitchy-black beneath, or black: antenne and palpi black at the apex: legs pale rufescent, the hinder femora sometimes with a dusky patch in the middle; the anterior thighs thickened ; the male with a dense pale fringe beneath, and in the female slightly ciliated. Not very common near London, where it is occasionally found, as well as in Norfolk. ‘ Southend, and Kensington-gardens.”— Rev. F. W. Hope. “ At Anglesea-abbey, Cambridgeshire, but not plentifully.’"—Rev. L. Jenyns. “ Parley-heath."— Mr. Ingpen. Sp. 27. striolatus. Oblongo-ovatus, subdepressus, niger, longitudinalitér subti- lissimé striatus, striis anastomozantibus, antennis pedibusque rufis. (Long. corp. 3+ lin.) Dy. striolatus. Gyllenhal.—Co. striolatus. Steph. Catal. p. 51. No. 512. Small, oblong-ovate, rather depressed, black, longitudinally finely striated, the strie frequently anastomozing, as in Co. bipustulatus: head glossy-black, with the mouth, labrum, and margin of the forehead, ferruginous ; the crown 48 MANDIBULATA.—COLEOPTERA. with two transverse rufous spots: antenne ferruginous: thorax rather convex, glossy-black ; the margin above, especially anteriorly, ferruginous: scutellum pitchy-red: elytra oblong-ovate, rather depressed, immaculate shining black, each with three very irregular rows of impressed dots, sprinkled without order towards the apex, besides the anastomozing strie: body shining pitchy-black beneath, with the margins of the segments ferruginous: legs deep rufo-fer- ruginous, with the femora, especially the posterior, often pitchy-black at the base. I am not aware of the locality of my specimen of this species (which is the only indigenous example I have seen), but suspect that it was taken near London several years ago. Sp. 28. affinis. Ovatus, convexus, niger, subtilissime punctato-substrigosus, an tennarum basi pedibusque rufis, elytris lineolis duabus pellucidis. (ong. corp. 3 lin.) Dy. affinis. Paykul.—Co. affinis. Steph. Catal. p. 51. No. 507. A small species: ovate, convex, black, very finely, but obsoletely, punctate- strigose: head shining black, with the mouth and labrum testaceous, and two rufescent transverse spots on the crown: antenne pale-rufescent, with the apex brown: thorax above convex, immaculate shining black, with a punctate continuous stria within the apex, and another, interrupted in the middle, at the base: elytra oblongate-ovate, not dilated in the middle, convex, glossy- black; a little beyond the middle, within the margin, as lender pale pellucid streak, and within the apex another, more distinct: on the disc of each elytron are three irregular rows of impressions, which become scattered towards the apex, where, towards the suture, is a regular stria of punctations: body glossy- black beneath, irregularly strigose: four anterior legs rufescent, with the base of the femora pitchy-black ; the posterior pitchy-black. Rare: I have two specimens, which I believe were captured in Norfolk. ‘Netley, Salop.”—Rev. F. W. Hope. Sp. 29. uliginosus. Ovalis, convexus, niger nitidus, aut nigro-ceneus, subpunctatus, thoracis elytrorumque margine antennis pedibusque rufo-ferrugincus. (Long. corp. 34 lin.) Dy. uliginosus. Linné.—Co. uliginosus. Steph. Catal. p. 51. No. 513. Oval, convex, shining-black, finely punctulate ; head depressed, with the mouth, labrum, and margin of the forehead rufo-ferruginous, and two rather large transverse spots on the crown: thorax rather sinuated behind, above convex, glossy-black, with a brassy tinge, the lateral margins broad and rufo-ferru- ginous: elytra large, ovate, not dilated in the middle, very convex anteriorly, ‘shining, somewhat brassy-black, with the lateral margins paler ; on each are three very irregular rows of impressed dots towards the base, and a few im- pressions near the suture: body glossy-black beneath, with the segments of the abdomen edged with ferruginous: legs rufo-ferruginous, with the femora more or less dusky: antenne pale-rufescent, with the tip rather obscure. DYTICIDZ.—COLYMBETES. 9 + Var. g. Co. eratus mihi. Steph. Catal. p. 51. No. 508. With the disc of the thorax and the elytra rich greenish-brass; in other respects similar to the above. The Marshamian specimen of var. @. is the only indigenous ex- ample I have seen: I am not aware of its locality; and of var. £., which is in the British Museum, I have also seen but one, which was captured near Windsor. + Sp. 30. ferrugineus. Ovatus, converus, rufo-testaceus aut ferrugineus nitidus, levissimus, elytris saturatioribus basi margineque dilutioribus. (Long. corp. 4—4d lin.) _- Co. ferrugineus mihz. Steph. Catal. Appendiz. Ovate, convex, glossy, rusty-testaceous or ferruginous, very smooth: head rather depressed, rufo-testaceous, with sometimes a small black spot on the crown: thorax convex, rather sinuated behind, with the hinder angles thrown back and obtuse, bright rufo-ferruginous, immaculate ; on the anterior and poste- rior margins, towards the angles, are a few impressed dots, placed in a row: elytra convex, deep rufo-ferruginous, immaculate, with the lateral margin and the base indeterminately paler or testaceous, and the suture rufescent ; the dise with three obsolete rows of distant impressed dots: thorax beneath rufous: plure and abdomen black: four anterior legs rufo-piceous, posterior nearly black, the tarsi piceous: antenne pale rufo-ferruginous, very short. Of this insect, which is apparently nondescript, there are eight specimens in the collection at the British Museum; they were captured by Dr. Leach, in South Devon, in the spring of 1825. Sp. 31. aterrimus. Subovatus subeneo-niger, obscuré-nitidus, immaculatus, an= tennis solis rufis. (Long. corp. 4 lin.) Co. niger. Steph. Catal. p. 51. No. 509. Subovate, somewhat brassy-black, obscurely shining, immaculate; beneath a powerful glass, somewhat finely striated, as in Co. bipustulatus: head with the mouth and labrum pitchy; the vertex immaculate: thorax obsoletely sinuated behind, slightly convex ; elytra somewhat ovate and convex, very finely but obsoletely striate, with three faint longitudinal rows of impressions at the base, and some scattered dots towards the apex ; dull brassy-black, with the outer margin obscurely piceous: body pitchy-black, tinged with eneous beneath, and thickly strigose: legs, especially the posterior, deep pitchy- black. Co. niger of De Jean is synonymous with Co. grapii: I have therefore been compelled to change the name from that in my Catalogue. I have only a single specimen, which was taken near London, in 1820. 80. MANDIBULATA.——COLEOPTERA. Sp. 32. bipustulatus. Ovatus, niger, nitidus, longitudinaliter tenui-striatus, posters angustatus depressus, pedibus piceis. (Long. corp. 44—5} lin.) » Dy. bipustulatus. Linné.—Co. bipustulatus. Steph. Catal. p. 51. No. 510.. Ovate, black, shining, depressed posteriorly, the entire surface thickly and evi- dently covered with slender longitudinal anastomozing strie: head with the labrum and mouth pale-ferruginous ; the vertex with two elongate rufo-fer- ruginous transverse spots: thorax sinuated posteriorly, rather convex, glossy- black: elytra ovate, large, slightly convex anteriorly, depressed: posteriorly, shining black, with a brassy tinge, the strie rather deeper than on the head and thorax, and the disc of each elytron with three irregular rows of impres- sions: body pitchy-black beneath, striated, the posterior segments with fer- ruginous edges: legs pitchy-black, the anterior tibie and tarsi testaceous. Var. 6. Steph. Catal. 1. c. With the anastomozing strie more deeply im- pressed. Var. y. _ Steph. Catal. 1. c. With the elytra entirely more or less of a pitchy- brown or rufo-testaceous: probably immature. Extremely common throughout the metropolitan district; and, I believe, in most parts of the south. ‘ Very abundant in Cam- bridgeshire.”—Rev. L. Jenyns. ‘Somewhat scarce near Kimpton, occurring only in ponds.”—Rev. G. T. Rudd. Sp. 33. confinis. Ovalis subdepressus, niger, elytris laevissimis fuscis margine piceo-testaceo, pedibus piceo-nigris. (Long. corp. 4 lin.) Dy. confinis. Gyllenhal.—Co. subopacus. Steph. Catal. p.'51. No. 511. Oval, subdepressed, black: head finely punctulate, the labrum and mouth fer- ruginous ; the crown with two transverse rufo-ferruginous spots: thorax a little convex ; finely punctulate, subsinuated behind, rather glossy and brassy-black, the lateral margins slightly rufescent: elytra large, ovate, not dilated in the middle, a little depressed, the back shining dusky-black, very smooth, the margins indeterminately pitchy-testaceous ; each elytron with three rows of impressions, placed somewhat regularly at the base, but irregularly towards the apex: body deep-glossy black beneath, the posterior segments of the abdomen edged with ferruginous: legs pitchy-black, with the anterior tibie and tarsi rufescent. One specimen only of this species has come under my inspec- tion: it is in my own cabinet, and was taken by myself, several years back, in the neighbourhood of London. Sp. 34. angustior. Oblongo-ovatus angustior, converus, nigro-eneus, posteriis attenuatus, elytris immaculatis, corpore pedibusque piceis. (Long. corp. 4 lin.) Dy. angustior. Gyllenhal.—Co. angustior. Steph. Catal. p. 48. No. 482. Oblong-ovate, narrow, convex, blackish-brass ; the entire surface finely coria- ceous: head with the mouth, labrum, and sometimes the anterior margin of us DYTICIDA.—- COLYMBETES. 8] the forehead obscure ferruginous, with two transverse red spots on the vertex : thorax black-brass: elytra very oblong, narrow, scarcely dilated in the middle, attenuated towards the, apex, convex, immaculate blackish-brass, the margin concolorous, with three rows of irregular minute impressions on the disc: body glossy pitchy-black beneath: legs pitchy-black, with the joints and an- terior tibia rusty-piceous. Var. 6. With the four anterior legs entirely tenis Not common; taken in the metropolitan district. >>. 35. vittiger. Oblongo-ovatus, nigro-eneus, palpis antennisque ferruginers, pedibus rufo-piceis, elytris lined unicd laterali rufescente abbreviatd. (Long. corp. 44 lin.) Dy. vittiger. Gyllenhal?—Co. vittiger. Steph. Catal. p. 49. No. 483. Black or brassy above ; and, with a powerful glass, the entire surface appears covered with net-like strige: head with two transverse oblong rufescent spots on the vertex: the palpi ferruginous: thorax immaculate: elytra rather elongate, blackish-brass, with the margin concolorous; each with three rows of large distinct irregular impressions, and a reddish rather oblique, and some- times nearly obsolete, line towards the middle of the lateral margin: body be- neath brassy-black, obsoletely punctate: legs pitchy-red, anteriorly paler. This species appears to be in the collection at the British Mu- seum, wrenamed; it was taken by Dr. Leach in Devonshire four years since. Sp. 36. guttiger. Oblongo-ovatus, niger, subconvexus, subtis piceus, elytris lineolé punctoque fulvo-fenestratis, pedibus piceo-ferrugineis. (Long. corp. 4—4¢ lin.) Dy. guttiger. Gyllenhal—Co. guttiger. Steph. Catal. p. 51. No. 514. Oblong-ovate, black, somewhat convex, finely punctulated : head with the mouth and palpi rufo-ferruginous, with two transverse rufous spots on the crown: thorax rather convex, black, the anterior angles slightly ferruginous: elytra large, ovate, rather broader in the middle, anteriorly moderately convex, be- hind rather depressed, entirely black, with the margin concolorous ; on the disc of each elytron are three rows of very obsolete minute impressions, very irregularly disposed ; a little behind the middle, near the margin, is a narrow reddish-yellow transparent streak, and a round spot of the same colour within the apex: body beneath black, or pitchy-black, rather glossy: four anterior legs dull rufescent, the posterior pitchy-ferruginous. Var. 6. Co. immunis. Steph. Catal. p. 49. No. 484. With the rows of impressed dots on the elytra extremely obsolete ; visible only with a powerful glass. Not common near London; I have twice captured var. a. All the specimens that have come under my inspection of var. 3. were taken as below. “ Pools, Netley.”—Rev. F. W. Hope. Var. 3. ** Ponds in Bewdley-forest, Worcestershire.” Messrs. Cooper and Ing pen. Manpisutara. Vou. II. Isr Suvr. 1828. Gk 82 : MANDIBULATA.—COLEOPTERA. Sp. 37. fenestratus. Oblongo-ovatus, converus, nigro-eneus, posterius attenuatus, elytris lineolis duabus fenestratis, margine corporeque ferrugineis. (Long. corp. 5—6 lin.) c Dy. fenestratus. Fabricius.—Co. fenestratus. Steph. Catal. p. 51. No. 515. | Oblong-ovate, convex, brassy-black, attenuated posteriorly: head broadly fer- ruginous anteriorly, with the spots on the crown obsolete: thorax with the lateral margin more or less rufo-ferruginous: elytra convex, with the lateral margins broadly ferruginous, each with three longitudinal rows of irregularly dispersed impressions, and a little beyond the middle, within the margin, ° obsolete narrow longitudinal streak, and a second less distinct within the apex . body glossy rufo-ferruginous beneath: legs ferruginous. Var. 8. With the upper surface pitchy-black, beneath pitchy. Not uncommon but local near London. ‘ Croydon Canal.”— Dr. Leach. Tn Milden-hall drain, near Littleport, Cambs.”— Rev. L. Jenyns. * Parley Copse."—J. C. Dale, Esqe Sp. 38. ater. Oblongo-ovatus, niger, converus, posterius attenuatus, elytris lineolis duabus fenestratis, antennis pedibusque anterioribus ferrugineis. (Long. corp. 6—7 lin.) Dy. ater. De Jean.—Co. ater. Steph. Catal. p. 51. No. 516. Oblong-ovate, black, convex, posteriorly attenuated: head with the mouth dull ferruginous, and two more or less distinct ferruginous spots on the crown: thorax rather sinuated behind; above convex, the lateral margins obscurely pitchy-ferruginous: elytra large, oblong-ovate, slightly dilated in the middle, attenuated towards the apex, very convex, shining black, or dull neous, with the outer margin anteriorly pitchy-brown ; on the disc of each elytron are three irregular rows of minute impressed dots; a little beyond the middle, within the margin, is a narrow longitudinal transparent pale testaceous streak, and an indistinct oblique one towards the apex: body pitchy-black beneath, with the apex and the margins of the abdominal segments frequently rufescent: four anterior legs rufescent, posterior pitchy-black. The colour of the upper surface varies in being somewhat piceous, and of the under by occurring of a pale testaceous: probably immature. Not uncommon in ponds throughout the metropolitan district; also in Norfolk, Dorsetshire, &c. “ Sundridge, Kent.”—-Mr. Ingpen. Sp. 39. obscurus. Oblongo-ovatus, niger, converus, elytris maculis duabus fene- stratis obsoletiusculis, corpore subtus, antennis pedibusque piceis. (Long. corp. 6 lin.) Dy. obscurus. Marsham.—Co. obscurus. Steph. Catal. p. 51. No. 517. Oblong-ovate, deep black, convex: head and thorax as in Co. ater: elytra very convex, obsoletely striated, with two very indistinct fenestrated spots, one on the lateral margin, a little beyond the middle, the others at the apex: body beneath, antenne, and legs pitchy. Va DYTICID#.—AGABUS. 83 I cannot imagine the above insect to be specifically distinct from the foregoing ; its smaller size, deeper colour, and apparent diversity of form, are the only distinctions ; and I have taken both in the same ponds; but upon the latter subject I shall enlarge at some future period. This appears synonymous with the Co. 4-guttatus, De Jean, Me cpaine to spe- cimens sent by him to Mr. Hope. Also taken in the vicinity of the metropolis, in Norfolk, &c. “In Bottisham-fen.”—Rev. L. Jenyns. “ Sundridge, Kent.”— Mr. Ingpen. “ Scarce near Kimpton.”—Reo. G. T. Rudd. } Sp. 40. quadrinotatus. Suwboblongo-ovatus, converus, niger, nitidus, elytris punctis duabus rotundatis albis, antennis rufo-ferrugineis, pedibus nigris. (Long. corp. 44 lin.) Co. 4-notatus mzhz. Steph. Catal. Appendix. : Somewhat oblong-ovate, rather attenuated posteriorly, convex, black, shining: head and mouth black, the former rather convex, with two large rufous spots on the crown: thorax smooth, with a deep arcuate impression on each side, within the hinder angles: elytra oblong-ovate, glossy black, very smooth, a little beyond the middle, near the outer margin, a large round transparent white spot, and rather within the apex a smaller one of the same colour: on the disc _ of each are three rows of impressed dots, placed rather irregularly towards the apex: body deep glossy black beneath: legs also black, with the four anterior tarsi rufo-piceous: antenne rufo-ferruginous. This differs from Co. guttatus by the superior convexity of its body, and more attenuated form, exclusively of the difference in the colour of its legs, &c. Five specimens of the above-described insect are in the collection at the British Museum; they were taken by Dr. Leach in Devon- shire in the spring of 1825:—they are apparently new; yet as nearly half the species of Colymbetes in the above collection are unnamed, and the species themselves are promiscuously arranged, it is a difficult matter to decide upon their identity or disparity ; it is therefore with considerable hesitation that I venture to pronounce this, as well as other insects which I have described from the Museum specimens, under such disadvantageous circumstances, as novel. Genus LX XXV.—Acasus, Leach. Palpi, external mazxillary with the second and third joints equal, the fourth longer and subulated: labrum bilobate: mandibles emarginate at the apex: mentum trilobate, the central lobe small. Antenne (of the males) with the seven basal joints obconic, the three following compressed, internally dilated, and serrated, the terminal small acuminate: head subovate: thorax elongate- transyerse: scutellum distinct: elytra ovate, attenuated: legs natatorial: an- G2 S84, MANDIBULATA.—COLEOPTERA. terior femora compressed, dentate beneath in the males: posterior tibie elon- gate: tarsi five-jomted, the anterior in the male coarctate, dilated: claws didactyle. . Agabus may be known from the following genera by the form. and proportions of the external maxillary palpi, the compressed anterior femora, the superior convexity of the body, and other less conspicuous characters; the males are further discriminated by the form of their antennz, and of their anterior dilated tarsi: from the foregoing genera, excepting Colymbetes, from which the palpi, &e. distinguish it, the present differs by having a scutellum and swim- ming posterior legs. 7 Sp. 1. serricornis. Nigro-piceus, levis, thoracis elytrorumque margine, corpore subtis pedibusque rufo-picets. (Long. corp. 54—6 lin.) Dy. serricornis. Paylul.—Ag. serricornis. Steph. Catal. Appendiz. Ovate, convex, obtuse ; smooth pitchy-black: head anteriorly rufo-ferruginous, with two large reddish transverse spots on the crown: thorax deeply emar- ginate anteriorly, very convex, smooth, the lateral margins broadly reddish- pitchy ; with an irregular continuous series of impressed dots, within the apex, and an interrupted one at the base: elytra very convex, the margin pale ferruginous ; the superficies under a powerful lens finely but thickly punc- tulate, with three irregular strie of impressed dots on each elytron: body pitchy-red beneath: legs the same: the anterior femora of the male com- pressed, dentate beneath, the anterior tarsi coarctate, somewhat patellate. Fe- male less, with simple antenne and anterior femora. | ‘“‘ Netley, Salop, rare."-—Rev. f°. W. Hope. Genus LX XX VI.—Hypaticus, Leach. Palpi, external maxillary with the second joint somewhat shorter than the fol- lowing, the third and fourth nearly equal, the latter subulated : labrum slightly emarginate: mandibles somewhat triangular, bifid: mentum trilobate. An- tenn with the second and third joints shortest, the remainder of nearly equal length: head rounded: scuéellum distinct: elytra ovate, convex, smooth in both sexes: posterior legs natatorial: tarsi five-jointed: anterior tarsi of the males patelliform and ciliated: zntermediate dilated: claws didactyle: thorax a little rugose in the females. Hydaticus was proposed as a genus by Dr. Leach, to discriminate those Dyticide that have the third and fourth joints of the external maxillary palpi nearly equal in length, with the latter subulated; the second and third joints of the antennz shortest; the body ovate and convex; the elytra smooth in both sexes; the anterior tarsi of the males patelliform, and the thorax somewhat rugose on the sides in the females. 4 pe ' DYTICIDZ.—HYDATICUS. ore) Sp. 1. transversalis. Niger, thorace anticé lateribusque ferrugineo, elyirts vittd marginali stridque buseos subundulaté abbreviaté flavis. (Long. corp. 6—64 lin.) Dy. transversalis. Fabricius.—Hy. transversalis. Steph. Catal. p. 51. No. 519. Black: head with the mouth and forehead testaceous-yellow, with two transverse ferruginous spots, and sometimes a triangular one in front: thorax anteriorly and with the lateral margins testaceous-yellow, the posterior edge with a broad anteriorly rounded black patch: elytra rather convex, with the margin broadly yellowish, throwing off obliquely several interrupted dashes to the disc, which has three punctate strie ; near the base of each elytron is a slender waved pale stripe, neither touching the suture nor the marginal band: body glossy- black beneath, with the apex and margins of the abdominal segments pitchy- ferruginous, and the sides of the latter frequently spotted with the same: legs ferruginous, the four anterior palest. Female with the thorax strigose, and the tarsi simple. | . Var. 6. With the abdomen entirely ferruginous beneath. The transverse streak at the base of the elytra varies considerably in width, and in some individuals it is broken in two. I once met with this species in a pond in Battersea-fields: it has since been taken abundantly in Yaxley-fens by Messrs. Chant, Bentley, and Weaver. ‘ One specimen found in the pond in the Botanic-garden, Cambridge.”— Rev. L. Jenyns. °* Pools, Netley.” —Rev. I. W. Hope. Sp. 2. Hybneri. Niger, thorace anticé lateribusque ferrugineo, elytris vitta marginali flavd. (Long. corp. 64—7 lin.) Dy. Hybneri. Fabricius.—Hy. Hybneri. Steph. Catal. p. 51. No. 520. Rather larger than the foregoing; deep black: head as in that insect: thorax moderately convex, with the anterior margin narrowly yellow, the sides broadly so, the base black in the middle: elytra slightly convex, glossy black, the ex- terior margin broadly yellow, posteriorly irrorated with black, the disc of each elytron with three strie of minute impressions, the outermost obsolete: body glossy black beneath : four anterior legs pale testaceous, posterior pitchy-black. ‘Female with the thorax strigose, and the tarsi simple. Far less common than the last, with which it has frequently been taken in company. ‘ Whittlesea Mere.”— Messrs. Bentley, Chant, and Dale. “ Pools, Netley.”—Rev. F. W. Hope. Sp. 3. stagnalis. Prater XII. f. 5.— Niger, capite thoraceque antic2, pedihusque anterioribus luteis, elytris nigris, margine lineisque luteis. (Long. corp. 6—64 lin.) Dy. stagnalis. Fuabricius—Hy. stagnalis. Steph. Catal. p. 51. No. 521. Black: head broadly yellow anteriorly, with the crown black, and bearing two ' transverse ferruginous spots: thorax moderately convex, reddish-yellow an- 86 MANDIBULATA.—COLEOPTERA. teriorly, with a black patch in the middle of the base towards the sides, and sometimes a narrow transverse black streak anterior to the latter : elytra rather convex, above black, with the lateral margin broadly yellow, the disc of each with five or six slender luteous streaks, of which the sutural ones are broadest, and placed nearly parallel, the others are narrower, somewhat undulated, and placed rather obliquely; the suture itself is black, and each elytron has three strie of impressed dots: body pitchy-black beneath: four anterior legs luteous, the posterior pitchy-black. Female with the thorax strigose, and the tarsi simple, ; Devonshire and Wilts are, I believe, the chief counties which have produced this fine, and apparently rare, insect. ‘In a pond near Exeter.” —Dr. Leach. “In a pond at Netley.”—Rev. I. W. Hope. + Sp. 4. cinereus. Luteo-testaceus, thorace antic? posticéque nigro, elytris ovalibus nigricantibus flavo-irroratis. (Long. corp. 6 lin.) Dy. cinereus. Linné.—Hy. cinereus. Curtis, ii. pl. 95.—Steph. Catal. p. 52. No. 522. Luteo-testaceous: head ferruginous, with the crown and two transverse waved frontal lines black: thorax rather convex, with a black fascia on the anterior and posterior edges, the disc with some delicate abrupt impressed strie: elytra ovate, moderately convex, smooth, black, thickly irrorated with pale pellucid spots, the margin testaceous-yellow, the disc of each elytron with three im- pressed striee: body pale testaceous beneath, the sides of the abdomen obscurely spotted: legs pale testaceous: the female has simple tarsi, and the thorax more deeply lineated. Two specimens, male and female, only of this insect have yet been taken in Britain; they occurred “the beginning of June 1825, at Whittlesea Mere.”—Messrs. Chant and Bentley. Genus LXXXVII.—Dyricus, Geoffroy. Palpi, external maxillary, with the three last joints of nearly equal length, the last with its apex obliquely subtruncated : labrum obsoletely emarginate: man- dibles truncate, emarginate: mentum trilobate, the central lobe bifid. Antenne with the second joint very short, the basal longest: head broad: scutellum distinct: elytra ovate, smooth, generally sulcated in the females: legs nata- torial: anterior tibi@ short: tarsi with five joints: claws didactyle: anterior tarsi of the males patelliform, with suckers beneath ; intermediate dilated at the base. This conspicuous genus affords a remarkable example of the attention which is now paid to our indigenous coleoptera: till within these three years, when I frst communicated the new acqui- DYTICID®.—DYTICUS. 87 sitions to the Zoological Club of the Linnean Society *, three species. alone were to be found in our cabinets, or had been recorded to inhabit Britain; the number has since been nearly trebled. TExclu- sively of their large size, which exceeds that of the other aquatics, excepting Hydroiis piceus, they may be known from the rest of the family by the nearly equal length of the three terminal joints of the external maxillary palpi, and the oblique truncation of the last; the elongation of the first, and the brevity of the second, joint of the antenne. The genus evidently contains several dissimilar forms, but as they are not readily discriminated without characters drawn from the disparities of sex, which are decidedly bad, I shall merely observe, that in the two first species both sexes have smooth elytra, in the remainder the females have them sulcated; again, the three first species are distinguished by considerable discrepancy in the size of the anterior claws in the respective sexes: the form of the furcate apex of the sternum differs according to the respective species. A. With the margin of the elytra not dilated. Sp. 1. conformis? Olivaceo-nigricans, subtis testaceus, suturis pectoris nigris, thoracis limbo vittdque elytrorum marginali luteis, elytris posteriis latioribus, sternt laciniis lanceolato-acuminatis. (Long. corp. 1 une. 4 lin.) Dy. conformis? Kunzé.—Steph. Catul. p. 52. No. 524. Olive-black, the elytra throughout finely punctulated, and dilated as in Dy. marginalis: head impunctate, with the mouth and labrum dull ferruginous, and an obsolete triangular rufous spot on the forehead: thorax finely punctu- lated, the hinder margin sinuated, the anterior with an interrupted row of impressed dots, and all bordered with luteous, the sides most deeply so; the disc with a longitudinal line: elytra with three rows of impressed dots, the spaces between punctulated, especially towards the apex, the lateral margin yellow at the base to a little beyond the middle: body deep testaceous or yellow beneath, the sutures of the breast, and some fascie at the base of the abdomen, black; the lacinie of the sternum lanceolate-acuminate: legs pale testaceous ; claws black. Female similar, with very obsolete rudiments of sulci. This species has been taken in Devonshire, near Ipswich, and, I believe, in Cambridgeshire. ‘ Whittlesea Mere, once taken.”— Mr. Chant. Sp. 2. circumcinctus. Pirate XII. f. 6.—Subolivaceo-niger, subtus testaceus, immaculatus, thoracis limbo inequalitér elytrorumque margine luteis, clytris serie punctorum inter singulas strias ordinarias, sterni laciniis acutis. (Long. corp. 1 unc. 3—4 lin.) Dy. circumcinctus. Abrens.—Steph. Catal. p. 52. No. 523. * See Zoological Journal, vol. u. p. 550. 88 MANDIBULATA.—COLEOPTERA. Subolive-black, elytra scarcely dilated, with a series of remote impressions be- tween the ordinary strie: head obsoletely punctulated, with a small obsolete frontal lunule, and the anterior margin luteous-red: thorax, with the entire margin luteous, the lateral broadly, and the anterior and posterior, the latter especially, narrowly edged ; the disc impunctate, with an abbreviated dorsal line, the base and apex with an interrupted row of impressions, and the lateral margins with a continuous scattered one: elytra oblong, rather convex, with three continuous punctate strie, and a series of remote impressions between each ; towards the apex more or less punctate, the lateral margin luteous : body beneath yellowish or deep ferruginous: the lacinie of the sternum very acute: legs testaceous. Female with the elytra smooth. Several pairs of this insect have been taken, but the males are usually confounded, in most cabinets, with those of the following species; they may, however, be readily distinguished by their differenee in form, and by their colour, both above and beneath. “‘ Netley, Salop.”—Rev. F. W. Hope. ‘June and July, 1824-5, Dykes in Yaxley-fens.”—Messrs. Chant and Bentley. * Law- rence Waltham.”—Mr. Hanson. Sp. 3. angustatus. Oblongo-ovatus, niger aut olivaceus, subtis testaceus, suturis pectoris nigris, thoracis limbo angustiis, elytrorumque margine latiis flavo- testaceis, sternt laciniis acutis, scutellum nigrum. (Long. corp. 1 unc. 2—34 lin.) , Dy. angustatus mihi.—Steph. Catal. p. 52. No. 526. Oblong-ovate, black or olivaceous: elytra scarcely dilated: head as in the last: thorax also bordered as in it, with the posterior margin very narrow, ard frequently obscured with fuscous clouds; the disc with a longitudinal line, and the margins punctured as in the foregoing: scutellum black: elytra oblong-ovate, not dilated, the lateral margins broadly testaceous or flavescent, the disc with three punctate strie, the spaces between obsoletely punctulate towards the apex: body testaceous or yellowish beneath, the sutures of the breast black, the laciniz of the sternum very acute: legs testaceous. Female with the upper surface of the thorax, and of the elytra, thickly but finely "punctate ; the base of the latter deeply sulcated beyond the middle. — The female is probably the Dy. dubius of Gyllenhal. ' Discovered at the same time with the former insect by Messrs. Chant and Bentley. “ Bomere, Salop.”—Rev. F. W. Hope. “ Ponds - near Bottisham, sparingly.”— Rev. L. Jenyns. Sp. 4. circumflexus. Oblongo-ovatus, olivaceo-niger, subtis flavo-testaceus, suturis pectoris marginibusque segmentorum abdominis nigris, thoracis limbo elytrorumque margine latizs flavo-testaceis, sterni lacinits acutis, scutelli medio jlavo. (Long. corp. 1 unc. 1—4 lin.) Dy. circumflexus. Ilkger.—Steph. Catal. p. 52. No. 525. DYTICID#.—DYTICUS. 89 Very similar to the preceding, but known at cnce by its yellowish’ scutellum, - form of the sternal lacinie, &c.: oblong-ovate, rich olivaceous, or olive-black: head as in the last, but the frontal lunule generally more distinct: thorax broadly margined throughout with yellowish, the posterior border rather undulated, and somewhat narrowed, the disc with an abbreviated dorsal line, - and. the anterior margin with a series of impressed dots, the lateral and : posterior margins nearly impunctate: scutellum with its centre, and some- times its apex, flavescent: elytra oblong-ovate, very little dilated, the lateral margin broadly flavescent; the disc with three punctate strie, the spaces _ between with a row of very remote, rather obsolete, impressions, and the apex _ with some scattered ones: body beneath bright testaceous-yellow, the sutures of the breast and the margins of the abdominal segments black: legs testa- _ ceous ; the posterior, with the apex of the tibie and the tarsi, pitchy-black. Female with the thorax and elytra above thickly punctate, the latter deeply sulcated beyond the middle. Common in ponds. round London; apparently rare elsewhere. «I never could detect this insect in Cambridgeshire.”— Rev. L. Jenyns. “ Lawrence Waltham.”—Mr. Hanson. Sp. 5. marginalis, Olivaceo-nigricans, thoracis limbo elytrorumque margine luteis, elytris posticis latioribus undique punctulatis, intra apicem lunuld fla- vescente, sterni lacintis subacutis. (Long. corp. 1 unc. 1—4 lin.) Dy. marginalis. Linné. Don, iv. pl. 161. Steph. Catal. p. 52. No. 527. Oblong-ovate, elytra dilated behind the middle: head smooth glossy-black, with the labrum and anterior edge luteous, a triangular mark on the forehead _ rufous, and a slightly-elevated line on the crown: thorax rather arcuate be- hind, moderately convex, the disc glossy-black, with an obsolete dorsal chan- nel, the margins entirely luteous, with an impressed punctulate stria: scutellum black: elytra anteriorly convex, nearly smooth, posteriorly depressed and punctate, the disc with three punctate strie; shining olive-black, with the lateral margin broadly luteous at the base, and narrowly towards the apex : body testaceous-yellow beneath, with the edges of the segments and middle of the sternum dusky, the lacinie of the latter broad, lanceolate: legs pale-tes- ~ taceous. Female with the upper surface punctulated, the elytra deeply sul- cated rather beyond the middle. The most abundant species of this genus in Britain, occurring nearly in every pond and large expanse of water, throughout the year, in common with several other Dyticide. From the observa- tions of Esper, this insect appears to possess considerable longe- vity (unless life were protracted through celibacy in the instance recorded by him): he tells us that he kept one in a vessel of water three years and a half, feeding it once a week, or oftener, with a piece of raw beef, the juice of which it devoured with avidity: it however occasionally fasted for a month. A specimen of Hydrous 90° MANDIBULATA.—COLEOPTERA. \ piceus being introduced, the Dyticus quickly despatched it, although as big again as itself, by seizing it in the only vulnerable part, be- tween the head and thorax. It was very susceptible of atmospheric changes, which it indicated by its movements. Sp. 6. submarginatus. Swbhoblongo-ovatus, nigricans, thoracis limbo elytrorumque margine angustiis luteis, sterni laciniis subacutis. (Long. corp. 1 unc. 1 ~ lin.) Dy. submarginatus mihi. Steph. Catal. p. 52. No. 528. Closely allied to the preceding, but appears to differ in having the sides of the elytra less dilated, with a narrower luteous margin, and in having the under side very little obscured in the centre of the sternum, and on the abdominal segments ; the lacinie of the sternum appear rather more acute: in other re- spects similar. Female punctulated: above, with the elytra deeply sulcate beyond the middle. Probably not sufficiently distinct from Dy. marginalis. Taken near London, but sparingly. Sp. 7. punctulatus. Undique niger, thoracis elytrorumque margine laterali luteo, sterni laciniis rotundatis. (Long. corp. 11 lin.—1 une. 2 lin.) _ ‘ Dy. punctulatus. Ilhiger. Don, xv. pl. 540. Steph. Catal. p. 52. No. 529. Black ; head with the labrum and anterior edge luteous, and a rufo-ferruginous lunule on the forehead: thorax above convex, faintly channelled, the lateral margin alone broadly luteous, the anterior sometimes obscurely ferruginous : scutellum with the apex rufescent: elytra scarcely dilated, moderately convex, - with the outer magin luteous, and three deeply-impressed punctate strie on the disc of each: body beneath with a few obscure ferruginous spots on each side ; suture with its lacinie rounded at the apex: legs pitchy-ferruginous. Female finely punctate above, with the elytra deeply sulcated beyond the middle. Not so common as Dy. marginalis and circumflexus, though fre- quently taken in ditches and ponds in the neighbourhood of Lon- don, especially in Battersea-fields, during the early summer months. ‘¢ Very common in Cambridgeshire.” —Rev. L. Jenyns. Sp. 8. dimidiatus. Niger, subtis testaceus, suturis pectoris nigris, thoracis elytrorumque margine laterali flavo, sterni laciniis obtusis. (Long. corp. 1 unc. 5—6 lin.) Dy. dimidiatus. Bergstraesser. Curtis, iii. pl. 99. Steph. Catal. p. 52. No. 530. Black, shining ; head with the mouth and a broad fascia in front luteous ; and a reddish triangular mark on the forehead: thorax rather sinuated behind, with an obsolete dorsal line, the lateral margins broadly yellow, and the anterior and posterior obsoletely-ferruginous: elytra large, ovate, smooth anteriorly, DYTICIDE.—OYBISTER. 9] towards the apex subpunctate, the dise with three strie of minute impressions, the lateral margin broadly luteous: body beneath testaceous, with the sutures of the breast black: sternum with the lacinie obtuse: legs pale-ferruginous. Female with the thorax and apex of the elytra punctate; the latter deeply sulcated at the base to the middle. Discovered in June, 1824, in Yaxley-fens, by Messrs. Chant and Bentley: since taken in Whittlesea Mere, and in other parts. “ In the pond in the Botanic garden, Cambridge; also in Bottisham- fen: the males appear to be more abundant than the females.” — Rev. L. Jenyns. “ Elsemere, and Bomere, Salop.”—Rev. F. W. Hope. Genus LXXXVIII.—CynisteEr, Curtis. Palpi, external maxillary with the second and third joints of equal length, elongate-obconic, the fourth longer, slightly dilated externally, truncate: labrum slightly emarginate: mandibles truncate obliquely : mentum trilobate, the central lobe truncate. Antenne with the second joint extremely short, third longest: head rounded: scutellum distinct: elytra broad, ovate, smooth ; strigulated at the base in the females: Jegs natatorial ; tibie very short ; tarsi five-jointed ; posterior monodactyle: anterior tarsi patelliform in the males ; intermediate simple. The broadly-ovate and very depressed form of this genus well distinguish it from its affinities, but its chief characters are drawn from the form of the terminal joints of the palpi, and the brevity of the posterior tarsi; in this last particular, as well as by its depressed body, it is closely allied to Acilius; but from that, as well as the B. Elytra with the margin dilated. } Sp. 9. latissimus. Miger, subtis brunneus, elytrorum margine dilatato, vitta laterali, thoracisque limbo toto luteis, sterni laciniis acuminatis. (Long. corp. 1 unc. 8 lin.) Dy. latissimus. Linné. Steph. Catal. p. 52. No. 531. Very broad, black above, shining ; head as in Dy. dimidiatus: thorax truncate behind, with a dorsal line, smooth, the entire margin broadly luteous: scutellum ferruginous at the tip: elytra greatly dilated in the middle, the margin depressed and expanded; above convex anteriorly, depressed poste- riorly, with a luteous streak within the margin, and a transverse one within the apex, the disc with two rows of impressions: body beneath glossy-brown, sternum with its lacinie acuminate at the apex: legs rusty-brown. Female with the elytra deeply and irregularly sulcate nearly to the apex. Berkenhout gives this fine species as British, but I know not on what authority. Q2 MANDIBULATA.—COLEOPTERA. four last genera, it is at once known by the posterior monodactyle tarsi; although, in Acilius, one claw is exceedingly minute. } Sp. 1. Roeselii. Olivaceo-niger, clypeo thoracis elytrorumque margine ex- teriori flavis, elytris obsolete striatis. (ong. corp. 1 une. 1 lin.) Dy. Roeselii. Fabricius.—Cy. Roeselii. Curtis, iv. pl. 151. Steph. Catal. p. 53. No. 532. Olive-black, rather glossy: head with the clypeus and anterior margin ochraceous- yellow: thorax with a faint dorsal channel, the base obsoletely strigose ; the lateral margin ochraceous: elytra a little convex, with three longitudinal strie of very remote impressed dots, the outer margin with a yellow or ochraceous streak, reaching from the base nearly to the apex, the margin itself olivaceous : body testaceous or ferruginous beneath: legs testaceous, the anterior palest ; the posterior with the tibie and tarsi pitchy. Female with the thorax thickly covered with irregularly-waved strige ; and the elytra with about five-sixths of the surface from the base with abbreviated, frequently anastomozing, lon- - gitudinal strie ; the anterior tarsi simple: in other respects similar to the male. Roesel having described the metamorphosis of this species, Fabricius, in com- memoration thereof, named it after him. The only indigenous specimen I have seen of this fine insect is a female, which was taken at the end of September, 1826, at Walton, in Essex: it is in the collection of J. H. Griesbach, Ksq., who informed me, some time since, that a second example had occurred. Genus LX XXIX.—Aciiius, Leach. Palpi, external macillary with the second joint shorter than the third, the ter- minal longer than the latter ; swollen in the middle, attenuated and rounded at the apex: labrum very slightly emarginate: mandibles bifid at the apex: mentum transverse, scarcely emarginate anteriorly. Antenne with the first and third joints nearly equal in length, the second short: head small, rounded : scutellum distinct: elytra ovate, smooth, sulcate and hairy in the females: legs natatorial ; t2bie short: tarsi five-jointed ; posterior didactyle, the inner claw very minute: anterior tarsi patelliform in the males ; zntermediate simple in both sexes. The fusiform terminal joint of the external maxillary palpi, and the superiority of its length over the penultimate, and the dif- ferent form of the mentum, well distinguish this genus from all the preceding: the females have the elytra sulcated, the sulci thickly clothed with hair; and the males the anterior tarsi alone dilated. DYTICIDA.—ACILIUS. 03 Sp. 1. suleatus. Nigricans, lunulis quatuor fronialibus, thoracis limbo fascidque medida abbreviatd utrinque dilatatd, luteis; corpore subtis nigro, lateribus ventris flavo maculatis, pedibus posticis nigris, femorum apice flavis. (Long. corp. 7—9 lin.) Dy. sulcatus. Linné. Don, ii. pl. 68. f. 5.—Ac. sulcatus. Steph. Catal. p. 53. No. 533. Dusky-black: head with the mouth, labrum, anterior margin, an angular mark on the forehead, two lunules on the crown, and a bent mark before each eye luteous: thorax finely and thickly punctured; with the anterior margin griseous-yellow, the disc also with a yellow fascia, which is dilated on each side into an angulated spot, and frequently unites at the posterior angle with the yellow margin: elytra very little convex anteriorly, depressed posteriorly, throughout thickly and finely punctured, griseous, thickly irrorated with dusky, with a narrow line down the suture, and the lateral margin yellowish ; a transverse, waved, black cloud towards the apex, and three rows of black dots, placed longitudinally ; the dise of each has also three very obsolete elevated lines: breast deep-black, thickly punctate; thorax beneath with a large yellowish spot ; abdomen dusky-black, with an ovate yellow spot on the side of each segment, and the margins of the latter ferruginous ; the lacinie of the sternum rounded, pitchy: four anterior legs yellow, with the upper surface of the patelliform tarsi black; posterior black, with the trochanters and apex of the femora yellow. Female with a triangular patch on each side of the thorax, and four broad sulci on each elytron clothed with griseous hair; the anterior tarsi simple. Var. . With the fascia on the thorax interrupted in the middle, the elytra rather more thickly irrorated with black than in var. z. Var. y. With the margin of the thorax above luteous ; in other respects similar to var. a. + Var. 3. Ac. varipes. Steph. Catal. p. 53. No. 534. Thorax as in var. y, with the limb fuscescent: the anterior legs pitchy-yellow, with the base of the fe- _ mora black: posterior black, with the apex of the femora clouded with rusty- pitchy and black. . } Var. «. Ac. scoticus. Curtis IMMSS.—Steph. Catal. p. 53. No. 535. Thorax as in var. 8, elytra rather deeply irrorated with black on the dilated outer margin near the apex: legs with the tibie clouded with pitchy-black ; the anterior, in the male, with the patelliform tarsi also pitchy-black above: the abdomen with small luteous spots on its edge, its segments ferruginous. Having been favoured with the examination of two pairs of this last variety (ticketed by Mr. Curtis as Ac. scoticus), I feel satisfied that they are referable to Ac. sulcatus from not being able to detect any characters of sufficient im- portance to warrant their separation as a species; the mere suffusion of co- lour, without any difference in sculpture, in my opinion, not being cha- racteristic of specific distinction: yet this is by several persons considered a good species ; but upon this point I must refer to the Introduction to my Systematic Catalogue. 94 MANDIBULATA.—COLEOPTERA. Extremely common in most places, frequenting every large patch of water throughout the country; var. 6 (which upon a transient inspection I supposed to be a different species at the time my Cata- logue was printing) was found in Worcestershire, and var. ¢ ap- pears to be not uncommon in Scotland. Sp. 2. canaliculatus. Migricans, capite antice lined transversa frontis, thoracis limbo fascidque media abbreviati, utrinque dilatatd, luteis; ventre ped.busque flavis. (Long. corp. 65—7 lin.) | Dy. canaliculatus. Knoch.—Ac. canaliculatus. Steph. Catal. p. 53. No. 536.— Ac. caliginosus. Curtis, ii. pl. 63. Rather less than the preceding ; head anteriorly luteous, posteriorly black, with a transverse yellowish streak: thorax with its entire margin, and an abbre- viated transverse discoidal fascia, dilated on each side into a somewhat rounded ~ spot, luteous: elytra dilated about the middle, very thickly irrorated with dusky, with a very obsolete transverse black cloud towards the apex, and the outer margin and a narrow line down the suture yellow: breast black, thickly rugose-punctate: abdomen with the first segment entirely yellow, the rest yellow, with an abbreviated dusky black fascia at the base: legs pale luteous, immaculate. Female with the thorax glabrous: the elytra with four villose sulci: tarsi simple. This fine species was discovered four years since in the fens of Huntingdonshire by the two industrious collectors under mentioned. ‘¢ Stilton and Yaxley-fens, in July, 1824.”—Messrs. Chant and Bentley. ‘¢ In Scotland, near Edinburgh.”—Mr. Bainbridge. Famity [IX.—GYRINID®, Leach. Antenne very short, rigid, 9-jointed, the second with a lobate appendage, the rest forming a clavate cylindric mass: body oval, convex, or depressed, generally very glossy: thorax transverse, sinuated before and behind: legs unequal ; the two anterior very long, gressorial; the four posterior short, compressed, formed for swimming: eyes apparently four, two above and two beneath the head ; the latter deeply inserted into the thorax. This family evidently contains several genera, but as they are for the most part exotic, I shall merely allude to them in this place: the generality of the species are of small size; the larger ones ap- proximate to the Dyticide in form, but the structure of the antennz and legs sufficiently distinguishes them. ‘Their larve differ from those of the insects just named, by having on each side of the fourth, and seven following segments, a membranaceous conical appendage, which is flexible and bearded at the sides; these appendages com- GYRINIDE.—-GYRINUS. 95 municate with the tracheze by means of a small air tube; the last joint of the body is very small, and terminates in four long parallel hooks: they live in the water, and towards the middle of summer prepare an oval coccoon, pointed at each end, resembling brown paper, and fixed to the leaves or roots of plants. Genus XC,.—Gyrinus Auctorum. Palpi, external mazillary with the three first joints small, the terminal large, ovate ; internal uniarticulate: labrum short, transverse, sometimes projecting, ciliated anteriorly: mandibles short, bifid at the apex: mentum large, bilobed. Antenne with the basal joint large, globose, produced externally in a trian- gular compressed lobe, the remaining joints forming the club: head trigonate : body convex: elytra generally covering the abdomen entirely: anterior tarsi of the males dilated. The short, rigid antennz, and elongate anterior legs sufficiently distinguish the indigenous Gyrini from the other Hydradephaga; but the genus as now constituted evidently contains two dissimilar forms; the first comprising those species which have the labrum short, the body moderately convex, very glossy, striated and naked, its apex projecting semicircularly beyond the elytra, and the latter subtruncate; the others have the labrum projecting, the body very convex, punctured, and villose, with its apex not produced beyond the elytra, but somewhat pointed ; the former appear to be more gregarious than the latter, and may be observed during fine weather upon the surface of the water in clusters, rapidly whirling about in all directions, whence their names of water-flea or whirl-wig : sometimes they are motionless, but upon the approach of any one they are instantly in motion again, and if alarmed dive quickly, carrying with them a bubble of air, resembling a globule of quick- silver: in the evening or in dull and cold weather they are rarely to be seen, being at such times sheltered under the banks, or be- neath the roots of plants. ‘They seize their prey by means of their elongate anterior legs; many of the species secrete a fluid of a most disagreeable odour, which they eject-when handled, and the scent will remain for some time on the fingers. A. Elytra glabrous, punctate-striated. Sp. 1. eneus. Oblongo-ovatus, ceruleo-niger nitidissimus, subtis obscure eneus, capite, thoracis elytrorumque limbo et margine reflexo suturdque nitido-ceneis. (Long. corp. 3—32 lin.) Gy. eneus. Leach MSS.—Steph. Catal. p. 53. No. 537. Oblong-ovate, very glossy blue-black: head brassy, very smooth, with two im- = ee ee ee 96 MANDIBULATA.—COLEOPTERA. pressions on the forehead: thorax above convex, with a crenated stria on each side within the anterior margin, and two rather obsolete ones towards the middle ; the lateral margin bright eneous: scutellum brassy: elytra subovate, deeply punctate-striated, with the suture and outer margin bright-brassy, the reflexed margin deep pitchy-black, with a bright brassy gloss: body of a blue or greenish tinge beneath, glossed with brassy: legs rufo-ferruginous ; the four posterior femora somewhat obscured with dusky: antenne blue- black. Extremely abundant in ditches by the side of the Surry Canal, near its junction with the Croydon. ‘“ Duddingstone-loch, near Edinburgh; in a deep pool in the river Dart; and in a pond near the river, not far from Spitchweek.”—Dr. Leach. ‘ Common near Bottisham.”—ev. L. Jenyns. Sp. 2. marinus. Oblongo-ovatus, nigro-ceruleus, nitidus, subtus e@neus, elytris 3 fortizs punctato-striatis, margine infleco eneo. (Long. corp. 24—3 lin.) Gy. marinus. Gyllenhal. Steph. Catal. p. 53. No. 538. Oblong-ovate, blue-black, shining: head and thorax sculptured asin the last, but without the brassy tinge: elytra but little dilated, rather deeply punctate- striated, shining blue-black, with the suture and margin greenish-brass, and the inflexed margin glossy-brass: body beneath shining brass: legs pale rufescent. ath Var.'6. With the scutellum, suture, and upper margin of the elytra concolorous. Var. y. Steph. Catal. }. c. var. 6. With the disc of the elytra more or less fer- ruginous. Distinguished from the last by its smaller size and less brilliant colours. As its name indicates, this species usually frequents waters in the vicinity of the ocean. .“ Abundant near Carlisle; in Lochend, Scotland ; and near Saltcoats, Devonshire.”—Dr. Leach. ‘* Common at Bottisham.”—ev. L. Jenyns. Sp. 3. minutus. Prare XIII. f.1. Oblongo-ovatus, supra cerulescente-virescens, nitidus, subtis rufo-testaceus, elytris punctato-striatis margine inflexo pedi= busque testaceis. (Long. corp. 14—2} lin.) . Gy. minutus. Fabricius.—Steph. Catal. p. 54. No. 539. The least species of the genus: more elongate and slender than the next; deep glossy greenish-blue above: head and thorax as in Gy. eneus: scutellum short, sometimes «neous: elytra elongate, convex, rather deeply punctate- striate, deep blue-black, with the outer edges glossed with brassy ; the inflexed margin pale-testaceous: the body beneath, and legs the same: the intermediate segments of the abdomen sometimes pitchy-black. Rather a scarce species; not frequently met with near London, but more abundant near Bristol and Swansea. ‘ Near Ashburton, Devon.”—Dr. Leach. “ Netley."—Rev. F. W. Hope. SEE comer lin ' et sf . ( ae 4 : | i . | | ‘ nh, le arn | GS we x aft a= London, Pub. by IF Stephens 1 Feb 1329 CWagstart 86, GYRINID#.—GYRINUS. OW Sp. 4. natator. Ovatus, cerulescenti-niger, glaberrimus, elytris subtilissimé punc= tato-striatis, margine subtis ano pedibusque ferrugineis. (Long. corp. 2?—34 lin.) Gy. natator. Linné.—Samou. pl. 2. f: 2.—Steph. Catal. p. 54. No. 540. Ovate: glossy blue-black: head as in Gy. eneus, with the mouth rufescent: thorax anteriorly and posteriorly sinuated, above convex, with an arcuate cre- nated striga on each side within the anterior margin, and a simple obsolete one towards the middle of the disc: scutellum small: elytra subovate, atte- nuated posteriorly, above convex, very glossy, blue-black, greenish towards the margins, very finely punctate-striate, the inflexed margin pale testaceous: body shining brassy-black beneath, with the apex ferruginous, the breast testaceous, and the legs pale ferruginous. Abundant in ponds and stagnant waters in several parts of the kingdom. Sp. 5. substriatus. Subovatus, cwrulescenti=niger, nitidus, elytris tenuissime punctato-striatis, margine inflexo ferrugineo. (Long. corp. 3 lin.) Gy. substriatus mihi.—Steph. Catal. p. 54. No. 541. Head and thorax as in Gy. natator: elytra deep blue-black, obscurely tinged with greenish on the outer margins, the disc very slightly striated, the strie composed of remote punctules; the inflexed margin deep ferruginous: body beneath as in Gy. natator. | Similar to the last, but differs in the very obsolete striation of the elytra: it may possibly be a mere variety, but I have seen many specimens. Taken near London, and in Devonshire. ‘ Yaxley-fens, June and July.”—Mr. Chant.“ Common near Bottisham.”—Rev. L. Jenyns. ‘ Kimpton.”—Rev. G. T. Rudd. Sp. 6. lineatus. Prater XIII. f. 2.—Ovatus, supra eneo-niger, infra piceo-fer- rugineus, elytris obsoletissimeé punctato-striatis, lineis longitudinalibus subeneis ornatis, margine inflexo ferrugineo. (Long. corp. 3—3} lin.) Gy. lineatus. Hoffmansegg.—Steph. Catal. Appendix. Ovate ; deep brassy-black above, very glossy: head as in Gy. natator, with the labrum bright zneous: thorax and elytra also as in the last-named insect, but the latter with the strie nearly entirely obliterated, especially on the back, and their places occupied by several longitudinal rather obscure streaks or lines, appearing rufescent in certain lights; the outer margin is greenish- brass, and the inflexed one ferruginous: body beneath entirely pitchy-ferru- ginous, with the legs paler. ‘‘ Slapton Ley, near Dartmouth, middle of June, 1828.”—Messrs. Chant and Bentley. Sp. 7. bicolor. Oblongus, subcylindricus, nigro-cwrulescens, glaberrimus, elytris subtilissime punctato-striatis, margine inflexo, pedihusque ferrugincis. (Long. corp. 3—3 lin.) Manpipuxata. Vou. II. Ist Ocr. 1828. 6 93 MANDIBULATA.—COLEOPTERA. Gy. bicolor. Fubricius.—Curtis, ii. pl. 79.—Steph. Catal. p. 54. No. 542. Elongate, subcylindric, very smooth blue-black: head, thorax, and scutellum exactly as in Gy. natator: elytra very much elongated, and slightly attenuated posteriorly ; the disc very finely punctate-striate, and of a deep blue-black, with the margins eneous, the inflexed one ferruginous: middle of the breast’ ferruginous ; abdomen beneath blackish-brass, with the apex of the last segment pitchy: legs rufo-testaceous. Female rather broader, and longer in proportion than the male. Not common; found in Norfolk and Suffolk. ‘* Near Southend, and at Tenbury, Worcestershire.”—Rev. F. W. Hope. “ Salt marshes and lakes in Devonshire, during the spring.”—Dr. Leach. B. Elytra villose, punctate. Sp. 8. villosus. Oblongus, supra niger, griseo-pubescens, subtus flavus, elytris vage punctatis. (Long. corp. 27—34 lin.) Gy. villosus. Tlliger.—Steph. Catal. p. 54. No, 543. Oblong, convex, subfusiform ; above dusky-black, rather glossy, and thickly clothed with a short grayish down: head finely punctulated, a little brassy ; the margin of the labrum with elongate pale cilia: thorax very convex, faintly punctulated, and slightly tinted with «neous: elytra elongate, very convex, arched, covering the abdomen, above thickly punctate, the lateral margin pale rufescent: the body testaceous-yellow beneath, the abdomen frequently yellow, the terminal segment narrow, conic, with a tuft at the apex: legs pale: an- tenne pale at the base and apex, with the intermediate parts pitchy-black. This species generally frequents rivers and running water, but is rare near London. ‘Common on the Dart, and in rivulets on Dartmoor.”—Dr. Leach. ‘ Netley, rare.’—Rev. F. W. Hope. ‘* Slapton Ley, in June last.”—Mr. Chant. Section I].—RypopuaGa, Or Cleansers, may be characterized by having four palpi only, two labial and. two maxillary; the internal maaillary being represented, according to the analytical views of Mr. Mac Leay, by the external lobe of the mavzilla, which is generally dilated, and frequently articulated, though rarely palpiform: the antenne clavate, or gradually thickening from the base to the apex. This section, following the views of the last-named writer, is divisible into three others; of which the first that presents itself is Subsection 3.—Puituypripa, Mac Leay, Or such insects as have the mandibles rarely exserted: the mazillary palpi usvally four-jointed: the mazille with the outer lobe generally articulated : the elytra covering the abdomen: the body mostly short, convex, or rounded on the PHILHYDRIDA. : 99 back: the posterior legs in the typical families formed for swimming, but in the others gressorial: the tibie spinose, or simple: and the ¢arsi with the number of articulations various. Notwithstanding the apparent discrepancy of structure among the insects of this group, the latter, in their perfect state, appear destined to cleanse the surface of nature from the decayed remains of vegetable matter, as those of the following subsections do from animal impurities ; though the typical family, in the larva state, are decidedly carnivorous, and feed upon living aquatic mollusea, while the conterminous group of Anisotomidee subsist chiefly upon fungi, and the families of Parnide and Heteroceride are supposed to devour animal substances alone. The insects of the typical family reside, in their first and final states, in the water, and swim well; whereas those of the four families preceding them generally prefer the banks, and may be said rather to walk in the water than swim: the succeeding insects frequent damp pastures, burrowing, by means of their spinous tibiz, into their pabulum, the dung of herbivorous mammalia, as the Anisotomide do into fungi; and thus resemble the Hetero- ceridz, which also burrow by similar means. It has ever appeared extraordinary to me that Latreille and others should have separated the insects of this group, by the inter- vention of totally dissimilar objects, from the Hydradephaga, with which they are evidently so intimately connected in habit: it there- fore afforded me great satisfaction to find that the views of the learned author of Annulosa Javanica corresponded so nearly with my own on this point; though I fear that my limited knowledge of exotic forms may cause me to do violence to nature by proposing the following arrangement of the indigenous families contained in this subsection : (haud serrate, (moniliformes: . . 16.-ANISOTOMIDA. { extrorsum | sepissimé 1 . crassiores filiformes: . : . 12. LIMNIIDZ. a minusve ser- ( 4—articulati : » 10. HETEROCERIDE, Antenne rate: Tarsi 5-articulati : . Il. Parnrip2. Lclavate: ¢( minuto: Mandibule ( inermes: . 13. HrELopHonir7. Tarst ad apicem articulo d bidentate : - 14. HyDROPHILID«. primo longiori: . : ° ; : . 15. SpHARIDIIDA. 100 MANDIBULATA.—COLEOPTERA. Famity X.-HETEROCERID/, Mac Leay. Antenne short, 11-jointed, the two basal joints large, the remainder forming ar obsoletely serrated mass; body rather depressed: head elongate, inserted up to the eyes in the thorax, the latter transverse, subovate; legs alike; tibiae compressed, spinose: tarsi four-jointed. Of this family also there is but one indigenous genus, and, like the Parnide, their history is unknown, though it is supposed, from the structure of their trophi, that they subsist upon animal matter : they inhabit damp situations, especially the muddy banks of rivers, and on the sands of the ocean, into which they burrow, by means of their fossorial legs. Genus XCI.—HEtTeERocERUuS, Bosc. Palpi very short, three-jointed ; maxillary with the terminal joint securiform ; labial with the last joint conic, truncate: labrum hairy, semiorbicular: man- dibles tridentate at the apex, with a membranous lobe internally; mazille with the external lobe rhomboidal, the internal obtuse: mentum subcordate, deeply emarginate: labrum elongate. Antenne with the basal joint very large, the second smaller, cup-shaped ; the two following minute, the remainder ° forming a subserrated club: body oval, subconvex, pubescent. Males more _ slender and cylindric than the females. At least five species of this genus appear to inhabit Britain: they are remarkably variable, and much confusion has arisen through the various opinions of authors respecting the distinction of the species and varieties: they inhabit, as before stated, the muddy banks of rivers, and may be obtained by trampling on the ground, when the little animals, aronsed by the sudden noise, shortly make their appearance, but if not quickly secured, soon burrow again beneath a fresh portion of the soil, or hide themselves in the crevices formed by the drying of the latter. Sp. 1. marginatus. Fuscus, pubescens, elytris pallidé ferrugineo-maculatis, pedibus fuscis, tarsis testaceis. (Long. corp. 13—23 lin.) He. marginatus. Fabricius.—Steph. Catal. p. 55. No. 549. Dusky or pitchy, pubescent, very finely punctulate: head and thorax immacu- late, the latter sometimes with a ferruginous tinge at the anterior angle: elytra with the margin and several irregular spots on the disc, more or less confluent or obliterated, paleferruginous: legs fuscous, with the tarsi testaceous: antennxe pale, with the club dusky. Not common near London: in plenty on the north-western coasts. HETEROCERID®.—HETEROCERUS. 101 ** Near Aberystwith.”—Rev. F. W. Hope. “Ina mud-bank near Tottenham.”—Mr. Stone. Sp. 2. flexuosus. Fuscus, pubescens, elytris luteis, vittd longitudinal flexuosa nigra, pedibus fuscis, tarsis piceis. (Long. corp. 2 lin.) He. flexuosus mzhi.—Steph. Catal. p. 55. INVo. 553. Fuscous, pubescent, finely punctured: head and thorax immaculate: elytra luteous, with a longitudinal flexuous stripe, composed of irregular black spots, an elongate black patch at the humeral angle, and a rather obsolete one a little behind the middle towards the suture, the apex immaculate: body beneath, and legs, fuscous, the latter with the tarsi pitchy. Taken on the banks of the Thames, beyond Gravesend. Sp. 3. Marshami. Niger, puncto ad basin thoracis apicemque elytrorum lutco obscuro, pedibus lutets—Marsham MSS. (Long. corp. 14 lin.) He. Marshami mthi.—He. obsoletus. Marsham MSS.—Steph. Catal. p. 55. No. 550. Similar to the following, but less than var. €: the entire body dusky-black, tomentose: thorax with a small obscure luteous spot in the middle of the base ; the elytra also, towards the apex, have a similar spot: body beneath dusky black: legs luteous— Marsh. MSS. The name obsoletus, which was obtained from my rough Catalogue, hineae been erroneously, though perhaps not inaptly, applied to another species of this genus, it has become necessary to change the one printed in the Catalogue itself, from the MSS. of Mr. Marsham, whose specific character and descrip- tion, above given, evidently do not apply to the insect which has lately been ' published as the He. obsoletus of Leach MSS.; a name which neither occurs in the Doctor's MSS. nor in the collection at the British Museum. I am not aware of the locality of this species, but as Mr. Mar- sham obtained it from Mr. Spence, [ presume it inhabits the banks of the Humber. Sp. 4. levigatus. Fuscus, pubescens, elytris macults in fascias irregulares dis- positis, pedibusque testaceis. (Long. corp. 14—2; lin.) He. levigatus. Fabricius.— Steph. Catal. p. 55. No. 551. Fuscous, glossy, finely punctured, and slightly pubescent: head and thorax generally immaculate, the latter rarely with a pale spot at the anterior angle: elytra with the margin and several large, subquadrate, pallid spots, disposed in three irregular fascia: these spots are very variable in form and size ; they are sometimes nearly confluent, at others distinct ; and are usually placed, two longitudinally towards the scutellum, two others behind these, near the suture, and a third pair towards the apex of each elytron; the pale outer margin of the latter is indented opposite the intermediate space: the body is frequently testaceous beneath ; and the legs pale-testaceous, with the tibia sometimes dusky. 102 MANDIBULATA.—COLEOPTERA, Var. 8. He minutus? Steph. Catal. p 55. No. 554. Rather less, and con- siderably more narrow, with the spots on the elytra somewhat distinct: probably the male. More frequent near London than He. marginatus, and also found in Norfolk and Suffolk. ‘“‘ On Wandsworth-common, in the spring.” —Mr. Ingpen. Sp. 5. obsoletus. Niger, hirtus, thorace anticé macula luted utrinque, elytris circiter punctis septem pallide ferruginets aut ochraceis, pedibus nigris. (Long. corp. 2—3 lin.) He. obsoletus. Curtis, v. pl. 224.—He nebulosus mihi.—Steph. Catal. p. 55. No. 552. Dusky-piceous or black, shining, very finely and thickly punctured, and pu- bescent: thorax with a luteous spot on each side, at the anterior angle: elytra with about seven or eight pale ferruginous or ochraceous spots on each, one near the scutellum, frequently obsolete, three placed somewhat triangularly before the middle, beyond these a larger lunate one near the suture, and finally three small ones, placed triangularly near the apex: the mandibles, spines on the tibie, and apex of the tarsi castaneous. This insect stands in the collection at the British Museum as He. marginatus: that it is the species thus called by Marsham, his character, “hirtus, niger, elytris punctis septem ferrugineis, as well as his habitats, “ prope Harvici oppidum, Maio. Prope Sheerness copiose, Septembre,” and one of his authentic specimens in my collection sufficiently testify. In the utmost profusion on the shores of the ‘Thames and Med- way. “‘ Plentiful near Rochester."—Professor Henslow. ‘The Isle of Sheppy, in June last.”—Rev. F. W. Hope. Famity XI.—PARNIDZ, Leach. Antenne very short, 9-jointed; the second with a lobate appendage, the rest forming a clavate mass: body subcylindric, convex, margined: head deeply inserted into the thorax; the latter subquadrate, slightly narrowed anteriorly: legs similar, all formed for walking ; ¢ibie cylindric, incurved: tarsi filiform, elongate, ail five-jointed. One genus only of this family has been found in Britain, which inhabits the borders of ponds and ditches during the spring; but although often found on the surface of the water, they are incapable of swimming: their food is unknown, but itis presumed to consist of animal matter, from the form of the maxille and mandibles. PARNIDA.—-PARNUS. 103 GENus XCII].—Parnus, Fabricius. Palpi short, maxillary four-jointed, subfiliform, the terminal joint largest, ovate- conic, apex acute: labial three-jointed, terminal joint oval: labrum slightly emarginate: mandibles bidentate at the apex, with two smaller teeth below: ’ mazille with the external lobe subquadrate, with a spine at the inner angele ; the internal slender, acute, articulated near the apex: mentum transverse- * quadrate: labiwm subquadrate. Antenne with the claws subserrated, the dentations obtuse: thorax with a longitudinal impressed line on each side: legs moderate, anterior and intermediate of nearly equal length. The habits of the Parni are evidently analogous to those of the Gyrini and Heteroceri, although their structure differs so remark- ably, especially from the former group: their curious antenne readily discriminate them from all the other British genera ex- cepting Gyrinus, to which they are remotely similar in form; but the clavate mass in that genus is cylindric and rigid, whereas in Parnus it is internally produced. and serrated. The species have been but little attended to, and confusion, the usual conernonte, has been the result. Sp. 1. prolefericornis. Hlongatus, olivaceo-griseus, tomentosus, subtilissime punctatus, elytris obsoletissimé substriatis. (Long. corp. 2—2? lin.) Pa. prolefericornis. Fabricius.—Steph. Catal. p. 54. No..544. Elongate ; olivaceous, densely villose, minutely punctured: head dusky: thorax very convex, disc without a fovea: elytra thickly and finely punctured, very obsoletely striated, especially on the sides and towards the apex: body ashy- brown beneath, pubescent ; legs dull-ferruginous, with the tibice dusky. Very abundant in April at the roots of grass and subaquatic plants on the borders of a pond in Battersea-fields, and on Wands- worth-common: also on the banks of ditches on Ockham-heath, near Ripley, at Hertford, &e. “ Near Epping..——Mr. Doubleday. * Netley, Salop.”—ev. F. W. Hope. Sp. 2. sericeus. Hlongatus, olivaceo-griseus, sericeo-tomentosus, subtilissime punctatus, elytris basi substriatis. (Long corp. 2} lin.) Pa. sericeus. Leach, MSS.—Samou. pl. 3. f- 10. Steph. Catal. p. 54. No. 545. Elongate, olivaceous, clothed with rich silken down; minutely punctured, the elytra substriated at the base: thorax not foveolated. This appears to me to be merely a variety of the foregoing, differing in having _ the pubescence on the body of a richer hue than usual. Taken in Battersea-fields and elsewhere, not uncommonly, in the spring. 104 MAN DIBULATA.—COLEOPTERA. Sp. 3. impressus. Hlongatus, olivaceo-fuscus, villosus, subtilissimé punctatus, thoracis disco bifoveolato. (Long. corp. 2—23 lin.) Pa. impressus. Curtis, ii. pl. 80.—Steph. Catal. p. 54. No. 546. “‘ Olivaceous-brown, minutely punctured, villose: thorax with a fovea on each side, near the base, equidistant from the margin and each other: elytra with seven or eight obscure punctured strie on each: serrated mass of antenne, thighs at the base, apex of tibie, tarsi, and claws, ferruginous: beneath fer- ruginous-olive, with ochraceous pubescence.”—Curtis, lc. This also appears to be a variety of Pa. prolefericornis, as I have several speci- mens of that insect in which the thoracic fovee are more or less evident. Taken near London; in Battersea-fields: and I believe “t Norfolk. Sp. 4. auriculatus. Ovatus, niger, hirtus, crebré punctatus, pedibus rufo-picets. (Long. corp. 2—24 lin.) Dr. auriculatus. Olivier.—Pa. auriculatus. Steph. Catal. p. 54. No. 547. Ovate, black, hairy: head and thorax rather deeply punctured, a little glossed — with fulvescent, the margins of the latter very narrow anteriorly ; scutellum fulvescent: elytra rather shining, deeply punctured, and clothed with rather distant, erect, fuscous hair: body pitehy-black beneath, with fulvescent pu- bescence: legs rufo-piceous, the tibie dusky. Less abundant than Pa. prolefericornis; and seldom taken near London. ‘* Wandsworth-common.”—Mr. Westwood. + Sp. 5. bicolor. Niger, subtilissime punctatus, elytris, pedibus antennisque fer= rugineis. (Long. corp. 2 lin.) Pa. bicolor. Curtis, fo. 80.—Steph. Catal. p. 54. No. 548. - “‘ Minutely punctured, with coarse, imperfect strie at the base of the elytra: head and thorax black ; elytra, legs, and antenne, ferruginous.’—Curtis, 1. c. Probably an immature state of one of the preceding species. Taken, I believe, in Norfolk. Famity XII.—LIMNIITD/. Antenne rather long, nine or eleven-jointed, subfiliform, the last joints rather larger, and forming a club: palpi short: body ovate, or subglobose, convex above: head inflexed, deeply inserted in the thorax, which is more or less quadrate and margined : legs elongate, alike ; tibie@ slender, not spinose: ¢arsz elongate, four or five-jointed. Without professing to be an adept in the doctrine of affinity and analogy, I consider that the insects of this family are far more closely allied to the other Philhydrida, notwithstanding their dis- crepancy of structure, than to the Byrrhide or Histeride, with LIMNIID/.—GEORYSSUS. 105 which they are usually associated; their habits are similar to those of the former insects, and unlike those of the latter: their location is, however, somewhat exceptionable; but I know not better where to place them, unless by approximating them to Heterocerus, through the medium of Georyssus, and to Parnus, by means of Elmis: the latter genus, in external characters, somewhat resembling Parnus; and Georyssus having also considerable affinity to Hele- plorus in the structure of the maxille and labium. Two genera only occur in Britain; thus discriminated : § triarticulato: 93. GEORYssUS. Aniennarum capitulo 2 uniarticulato: 94. Exmrs. Genus XCIII.—Georyssus, Latreille. Palpi short, subequal, with the last joint longer, stouter, ovate. Antenne nine- jointed, the first elongate, subcylindric; second globose, stout; third very short ; fourth elongate, cylindric ; the two following very short, the remainder forming a subsolid, or obsoletely perfoliated club: head greatly inflexed, hidden beneath the thorax, which is margined: body rather short and globose : legs moderate; tibie slender, slightly excavated laterally; tars¢ elongate, filiform, four-jointed. : This anomalous genus may be’ distinguished from Elmis by having four joints only to the tarsi; by the antenne being nine- jointed only; by the superior robustness of the terminal joint of the palpi, and by the short, globose body. Sp. 1. pygmeus. Pratre XIII.f.3. Niger, fronte rugulosd, elytris profundé punctato-striatis, humeris prominulis. (Long. corp. ?—1 lin.) Pi. pygmea. Fabricius.—Ge. pygmeus. Steph. Catal. p. 55. No. 555. Minute; black: head opaque, with the forehead unequally rugged: thorax rather shining, narrowed anteriorly, dilated on the sides beyond the middle, the base subsinuated, the disc nearly smooth posteriorly, with a transverse impression beyond the middle, and towards the sides a little rugged: elytra more glossy than the thorax, very convex, with the shoulders prominent, the disc striated with large deep impressions, the interstices finely coriaceous: body opaque black beneath, obsoletely punctate: legs black: antenne fuscous. Var. 6. The elytra dusky-pitchy. Inhabits damp places in Norfolk and Suffolk, and is occasionally taken near London. Genus XCIV.—E mis, Latreille. Palpi very short, nearly filiform, the last joint slightly larger, ovate-cylindric. Antenne 11-jointed, subfiliform, the joints nearly equal, the last rather larger, 106 MANDIBULATA.—COLEOPTERA. suboval: Acad inserted up to the eyes in the thorax, which latter is subqua- drate and margined: body ovate, stout: legs elongate: tibiw very slender, sub- cylindric, unarmed: tarsi nearly as long as the tibie, 5-jointed. Latreille drew up the characters of this genus by the name above employed in his Histoire Naturelle des Fourmis, published in 1802, giving as the type El. Maugetii; and in the same year Illiger, in the first vol. of his Magazin, applied the name Limneus to El. Volkmari, without characters, vide Ill. Mag. i. 297. I have therefore followed the former author (not from the mere circum- stance of his having detailed the characters, but from the impos- sibility of determining to whom the priority of distinguishing the genus was due, as their respective works appeared simultaneously), in conformity to the generally received views of modern writers; though 1 have, perhaps inconsistently, used the term Limniide to designate the family. Elmis differs from Georyssus by its somewhat elongate, convex, body, the five-jointed tarsi, eleven-jointed antenne, and subfiliform palpi: the species all inhabit gently flowing pebbly brooks and rivers, and may be found beneath the stones. A. Thorax with elevated lateral lines. a. Thorax without a transverse elevated posterior fold. Sp. 1. Volkmari. Oblongus, nigro-subeneus, thorace subquadrato elytris con- vextore, punctulato, nitido, lineato, lineis anticé conniventibus. (Long. corp. oe in| : | Dy. Volkmari. Panzer.— El. Volkmari. Steph. Catal. p. 53. No. 556. Oblong-ovate, black, tinged with brassy, or greenish: head finely punctulate: antenne obscure brown, with the base paler: thorax subquadrate, more convex than the elytra, punctured, shining eneous-black, with an elevated longitudinal line on each side, remote from the lateral margin, and approaching to each other anteriorly ; when viewed laterally these lines nearly disappear : elytra rather shining, regularly and somewhat deeply punctate-striated, the strie about eight in number, the interstices finely punctulate, and clothed with a scanty down: body beneath and the legs of a dusky or cinereous-black, or pitchy, clothed with a yellowish down: tarsi ferruginous. Not common; found in Norfolk, and sometimes near London. ‘© In a mill-stream near Hatfield in June.”"—Mr. Westwood. Sp. 2. tuberculatus. Oblongus, fusco aut piceo-eneus, aniennis pedibusque rufes- centibus, thorace bilineato, nitido, coleoptris basi obsolete bituberculatis. (Long. corp. 4—# lin.) Li. tuberculatus. JZiliger.—El. tuberculatus. Steph. Catal. p. 55. No. 657. LIMNIID &.—ELMIS. 107 Oblong ; fuscous or pitchy-brassy: antenne rufescent: thorax with an elevated line on each side, approximating in front, the intermediate space very glossy and punctulate, the exterior margin rather opaque: elytra slightly tuberculate at the base, and transversely impressed ; the disc eneous, rather obsoletely punctate-striated, the third stria from the margin rather elevated, and a little remote from the second, the interstices finely punctated: the body pitchy- brown, and punctulated beneath: legs rufescent. Found in Suffolk, and, I believe, also in Norfolk and near Hull. “¢ Clengre, Gloucestershire." Rev. F. W. Hope. Sp. 3. variabilis. Pirate XIII. f. 4.—Angustior, nigro aut piceo-eneus, antennis pedibusque rufescentidus, thorace subnitido, bilineato, coleoptris bast simplicibus. (Long. corp. 3—1 lin.) Li. variabilis. Leach MSS.—EI. variabilis. Steph. Catal. p. 56. No. 558. . Oblong, rather narrow and depressed ; black or pitchy-brass: antenne and legs rufescent: thorax with an elevated line on each side, approximating consi- derably in front, the intermediate space rather opaque, and obsoletely punc- tulated: elytra with the base simple; the disc frequently rufescent, sometimes pitchy or brassy-black, rather faintly punctate-striated, the three marginal strie slightly elevated, the interstices obsoletely punctured: body pitchy beneath. I believe this species chiefly frequents hilly districts. «© Near Carlisle and Spitchweek.”—Dr. Leach. ‘* Netley, Salop.”—Rev. F. W. Hope. Sp. 4. lacustris. Brevior, ovatus, rufo aut piceo-wneus, antennis pedibusque rufescentibus, thorace bilineato, coleoptris bast haud tuberculatis. (Long. corp. 42 in) El. lacustris. Spence MSS.—Steph. Catal. p. 56. No. 559. Shorter than the foregoing, ovate; rufous or pitchy-brass, with the antenne and legs rufescent: thorax as in the last, but broader and more glossy, and the lateral strie less approximating anteriorly: elytra not tuberculated at the base punctate-striated, the third stria from the margin elevated, and rather remote from the second ; the margin rather opaque, and the disc glossy, and frequently rufescent: body beneath pitchy. Taken near Hull; my specimens I obtained from the Marshamian collection. Sp. 5. fluviatilis. Brevior, ovatus, eneo-niger, antennis, tibiis tarsisque rufes- centibus, elytris obsoletissimé punctato-striatis, haud tuberculatis. (Long. corp. 2 lin.) El. fluviatilis mihi. Steph. Catal. p. 56. No. 560. Shorter and broader than El. lacustris; ovate, brassy-black ; with the antenne, tibie, and tarsi alone rufescent: the thorax with the usual approximating lateral lines, with the intermediate space rather depressed, glossy, finely and 108 MANDIBULATA.—COLEOPTERA. thickly punctulate, the margins rather opaque: elytra with the dise geneous, very faintly punctate-striated, the three lateral strie elevated, the third being somewhat remote from the second ; the base not tuberculated: body piceous, clothed with cinerescent down beneath. My specimen of this species was taken in Norfolk. Sp. 6. parallelipipedus. Prats XIII. f. 5.—Lineari-oblongus, niger, nitidus, antennis pedibusque rips thorace quadrato, bilineato divert? corpore RUG presso. (Long. corp. 3 lin.) Li. parallelipipedus. Miiller.—El. parallelipipedus. Steph. Catal. p. 56. No. 561. Oblong, linear, depressed, glossy black, with the antenne and legs rufescent: the thorax quadrate, very glossy, with a curved line on each side, scarcely ap- proximating anteriorly ; the intermediate space obsoletely punctulated, with a central impressed dot, the margin rather opaque, and considerably elevated laterally: elytra depressed, elongate ; the disc distinctly punctate-striated, the lateral strie elevated, the third from the margin especially, the interstices im- punctate, and very glossy: body pitchy-black beneath. I have seen four examples only of this species, all of which were taken, I believe, near Exeter, by W. Spence, Esq., who kindly sup- plied me with a specimen. b. Thorax with a transverse elevated posterior fold. Sp. 7. eneus. MWiger, subeneus aut wneus, antennis tarsisque rufescentibus, elytris basi thorace latioribus. (Long. corp. 1—1} lin.) Li. eneus. Miiller.—E]. eneus. Steph. Catal. p. 56. No. 562. Blackish-brass, or bronzed, shining : head obsoletely punctate, dull black : thorax subquadrate, very convex, black, slightly glossed with eneous, finely punc- tulated ; the disc anteriorly with an elevated straight line on each side, parallel with the lateral margin, behind the middle with an abbreviated transverse im- pression, connected with the lateral line, and the posterior margin, behind the impression elevated : elytra broader than the thorax at the base, oblong-ovate, very convex, slightly pubescent, deeply punctate-striated, the interstices finely punctulate, the alternate ones slightly elevated, and the sixth from the suture somewhat carinated: body beneath clothed with a dense golden down: legs pitchy-black, the base tomentose, and the tarsi rufescent: antenne rufescent, with the apex dusky. The most abundant species of the genus, taken occasionally in streams in the marshes, by the junction of the Surry and Croydon canals. ‘ Near Hatfield in June, copiously.”—Mr. Westwood. “‘ Netley, Salop.”— Rev. F. W. Hope. | Sp. 8. Maugetii?’ Ovatus, niger, antennis tarsisque ferruginco-brunneis, elytris basi thorace subequalibus. (Long. corp. 1—1} lin.) El. Maugetii. Lutreille?—Steph. Catal. p. 56. No. 563. LIMNIIDEH.—ELMIS. 109 Ovate, black, shining: thorax as in El]. eneus, with an elevated longitudinal line on each side, and a transverse abbreviated fovea posteriorly: elytra scarcely broader than the thorax, each with three elevated lines, and eight rows of im- _ pressions: body beneath, and femora at their base, clothed with a cinereous _ down: tarsi and antenne ferruginous-brown, or rufescent. Probably the Li. obscurus of Miiller, and not sufficiently distinct from El. eneus. ~ Found near Norwich, and in other parts of Norfolk. ‘ Clengre, Gloucestershire.”—Rev. F. W. Hope. B. Thorax without elevated lateral lines. Sp. 9. cupreus. Pxiate XIII. f. 6.—Ovalis, cupreo-niger, thorace levi posticeé utringue fossuld obsoleté transversd abbreviatd impresso. (Long. corp. 3—1 lin.) Li. cupreus. Miiller.—EI. cupreus. Steph. Catal. p. 56. No. 564. Oval, coppery-black, shining, slightly pubescent: head finely punctulated: thorax very convex, rather opaque, brassy-copper, the disc without elevated lines, with - an obsolete transverse impression on each side posteriorly : elytra oblong-ovate, rather broader at the base than the thorax, very convex, glossy eneous, deeply punctate-striated, the interstices finely punctulated, and the intermediate ones slightly elevated: body beneath, and legs at the base, clothed with a golden - down; the latter pitchy-black, with the claws rufescent: antenne also ru- fescent. ‘¢ Spitchweek.”—Dr. Leach. ‘ Ina paper-mill stream near Hat- field, in June.”—-Mr. Westwood. Famity XITI.—HELOPHORID A, Leach. Antenne nine-jointed, rather abruptly perfoliate-clavate, the club serrated or subsolid: mandibles without teeth at their extremities: mazillary palpi very long: body oblong, rather depressed: thorax somewhat quadrate, nearly or- biculate, or slightly cordate-truncate: ¢ibie a little spinous: ¢arsz filiform, not ciliated. The Helophoride may rather be said to walk in the water and upon its surface than swim, the formation of the tarsi not permitting them to perform the latter operation; they generally inhabit ponds and ditches, and may be frequently observed walking on the muddy borders, or floating slowly on the surface upon their backs, and sometimes ascending upon aquatic plants, whence they occasionally take flight. In their first state they are carnivorous, but in their final they become herbivorous. The four following genera inhabit Britain. . siore, ovali: n : . 95. HypRocuus. ; mediocres, ar- ( “S107, elongatus 9 aoe ticulo ultimo - or maxillares< transversus : . 96. HeLornonus. graciliore, acuto : ‘ é . 97. OCHTHEBIUS. longissimi, articulo ultimo utrinque acuminato : . 98 Hyprana. 110 MANDIBULATA.—COLEOPTERA. Genus XCV.—Hyprocuus, Germar. - Palp with the last joint oval, stout: maxillary much shorter than the antenne: clypeus entire: mandibles rather stout, trigonate, obsoletely emarginate at the apex, acute: mentum rather large, subquadrate. Antenne with the four ter- minal joints produced into a slightly compressed elongate club: head porrect: eyes very prominent: thorax elongate-quadrate: body nearly linear. The prominent eyes and elongate body well distinguish this genus from Helophorus, and its stout, ovate, terminal joint of the palpi at once discriminate it from Ochthebius and Hydreena. Sp. 1. elongatus. Migro-piceus, aut eneo-nigricans, elytris profundé punctato- striatis, interstitiis alternis carinato-elevatis. (Long. corp. 1?—2 lin.) El. elongatus. Fabricius—Hy. elongatus. Steph. Catal. p. 56. No. 565. Pitchy-black, sometimes slightly glossed with brassy: head porrect, rugose- punctate: thorax deeply punctated, with five impressed dots, three placed transversely and two oblong, towards the scutellum: elytra convex, dilated on the sides, deeply punctate striated, the interstices narrow, the second from the suture anteriorly, the third posteriorly, and the fourth, sixth, and eighth en- tirely, somewhat elevated: body pitchy-brown beneath: the abdomen rugose, foveolated: legs and antenne pitchy. Taken occasionally in April and May on the banks of ponds in Battersea-fields and on Wandsworth-common. ‘* Spitchweek.”— Dr. Leach. ‘“ Netley, Salop, common.”—Rev. F. W. Hope. Sp. 2. erenatus. A’neo-aut viridi-niger, elytris crenato-striatis, pedibus rufo-— piceis. (Long. corp. 1$—1$ lin.) El. crenatus. Fabricius——Hy. crenatus. Steph. Catal. p. 56. Io. 566. Brassy or greenish-black, shining: head porrect, thickly punctulated, with several elevated longitudinal lines on the vertex: thorax thickly punctured, with three transverse impressions anteriorly, and one on each side posteriorly near the hinder angle: elytra slightly dilated on the sides, deeply crenate-striated, the intermediate interstices scarcely elevated: body beneath punctulated: legs- and antenne pitchy-red or testaceous, the latter with the tip of the club black. Not uncommon on the muddy banks of ponds on Wandsworth- common, and on the borders of ditches on Ockham-heath, near Ripley, in April and May: also found near Hertford, and on the banks of the Orwell. ‘* Netley, common.”—Rev. F. W. Hope. Sp. 3. brevis. Brevior, niger, thorace foveolato, anticé latiort, elytris punctato~ striatis, interstitiis alternis elevatis. (Long. corp. 11—14 lin.) El. brevis. Herhst.—Hy. brevis. Steph. Catal. p. 56. No. 567. Short, subovate, deep shining black: head broad, trunctate: thorax broader an- Y HELOPHORIDA.—HELOPHORUS. 111 teriorly than at the base, roughly punctate, with five larger impressions, placed as in Hy. elongatus: elytra ovate, much broader than the thorax, the sides dilated, deeply punctate-striated, the alternate interstices elevated, the suture: and margin also elevated : body black beneath ; abdomen transversely rugose: legs and antenne pitchy-black. Less abundant than either of the foregoing species; rarely, if ever, taken near London: it, however, occurs in Norfolk, and near Bristol. “ Netley, common.”—Rev. F. W. Hope. * Whittlesea Mere, in July last.”—Mr. Weaver. Genus XCVI.—HEtLopnorus, Leach. Mazillary palpi shorter than the antenne, the last joint thick and oval: clypeus entire: mandibles stout, subtrigonate, a little emarginate at the tip, which is somewhat produced and acute: mentum large, subquadrate. Antenne with the two basal joints elongate ; the third, fourth, and fifth shorter, distinct ; the four following produced into an elongate-ovate club: eyes sessile: thorax transverse, longitudinally sulcate: body elliptic or subovate. Helophorus, as restricted by Dr. Leach, differs from Hydrochus externally, by having the eyes sessile, the thorax transverse, and the body subovate or elliptical: from Ochthebius and Hydrochus, the thickened ovate terminal joint of the palpi and sulcated thorax form the more prominent distinctions. A. Elytra without elevated lines. Sp. 1. aquaticus. wusco-eneus, cbscurus, thorace postice angustiori lateribus sinuato, elytris griseis punctato-striatis. (Long. corp. 2—3 lin.) Silpha aquatica. Linné.—He. aquaticus. Steph. Catal. p. 56. No. 568. Dull brassy-brown : head punctulated: thorax slightly convex, the lateral margins sinuated, slightly dilated anteriorly, and narrowed posteriorly ; above punc- tulated, with five longitudinal sulci; the middle one straight, the others more or less flexuous: elytra large, elongate, rather convex, deeply punctate-striated, the interstices flat, smooth ; griseous, with scattered obsolete dusky spots, the alternate ones faintly elevated, and the second from the suture with an abbre- viated, punctate, striola, as in many Geodephaga: body beneath fuscous, with a cinereous pubescence: legs flavescent: palpi and antenne testaceous. Common in every stagnant pond and ditch throughout the metro- politan district; and I believe in most parts of the country. Sp. 2. eranularis. Fusco-eneus, subnitidus, thorace lateribus rotundato integro, elytris punctato-striatis, insterstitiis convexis. (Long. corp. 1—1{ lin.) Buprestis granularis. Linné—He. granularis. Steph. Catal. p. 57. No. 569. Brown-brass, rather glossy: head «neous or dusky, obscurely punctulated : 112 MANDIBULATA.—COLEOPTERA. thorax more or less coppery or brassy, the lateral margins rounded, the disc with five longitudinal sulci, as in the foregoing species: elytra oblong, slightly convex, the back dusky-eneous, the margins griseous, rather deeply punctate- _ striated, the interstices narrow, convex, without an abbreviated stria on the second, towards the scutellum: body beneath black, pubescent ; legs, palpi, and antenne pale testaceous, the latter dusky at the tip. This also varies greatly in size: the elytra are sometimes griseous, clouded with dusky, and tinged with brassy, or nearly immaculate: the thorax also varies considerably in tint, being occasionally fuscous or dusky-brass. Very abundant in stagnant waters, not only in the metropolitan district, but elsewhere. Sp. 3. griseus. Oblongior, thorace viridi-cupreo nitido, lateribus subrectis, elytris pallidis fusco-nebulosis. (Long. corp. 14—12 lin.) El. griseus. Tlliger.—He. griseus. Steph. Catal. p. 57. No. 570. Narrower and longer than the preceding ; of a glossy cinereous: head shining cupreous green: thorax short, rather convex, the sides nearly straight and oblique, the disc with five sulci, generally of a shining green, with the sulci cupreous, and the anterior and lateral margins pale: elytra elongate, punctate- striated, the interstices flat, smooth, pale griseous, with several sprinkled fus- cous spots: body beneath black: legs, palpi, and antenne entirely pale- flavescent. Far from uncommon in stagnant ponds and ditches throughout the metropolitan district. ‘ Paddington.” Rev. F. W. Hope. Sp. 4. dorsalis. Prater XIV. f. 1.—Fuscus, thorace viridi, lateribus subrectis, elytris punctato-striatis, testaceis, nigro-nebulosis. (Long. corp. 14—@ lin.) Hy. dorsalis. Marsham.—He. dorsalis. Steph. Catal. p. 57. No. 571. Rather ovate, shining fuscous; head as in He. stagnalis: thorax green, with the sides nearly straight, the disc with five sulci, the second from the margin on either side curved outwardly, the rest nearly straight, the central one rather deepest: elytra rather broad, punctate-striated, the interstices slightly elevated, smooth; the disc testaceous, with a large common dusky-black patch, in which are two testaceous spots placed towards the apex: antenne, palpi, and legs pale: body dusky beneath. Not common: taken occasionally near London; also at Hertford, near Ripley; in Norfolk, Devonshire, &c. Sp. 5. viridicollis. Fusco-aneus, nitidus, thorace viridi-eneo, laterthus subrotun- datis, elytris wneo-nigris, profundé punctato-striatis. (Long. corp. 1? lin.) " He. viridicollis. Kirby MSS.—Steph. Catal. p. 57. No. 572. Short and broad, shining brassy-brown: head finely punctulate: thorax sub- quadrate, with the sides somewhat rounded, the disc greenish-brass, with five irregular sulci: elytra deep immaculate brassy-black, rather deeply punctate- VU Curtis Se/ Jonton Pub hy Th Stephens LAP SELG. Wagstas ie ie ‘| Se arte HELOPHORIDH.—HELOPHORUS. 113 striated, the interstices narrow, and a little elevated: body dusky black beneath ; antenne, legs, and palpi pale rufescent. Taken near London, and in Suffolk, apparently not common. Sp. 6. tuberculatus. Niger obscurus, thorace obsoleté sulcato, elytris punctato- striatis, interstitiis alternis tuberculis oblongis elevatis. (Long. corp. 14—13 lin.) El. tuberculatus. Gyllenhal—He. tuberculatus. Steph. Catal. p. 57. No. 573. Dull black: head punctulated: thorax sub-convex, the margins flat, broadest anteriorly, the sides nearly straight, oblique, the disc thickly punctate, with five rather obsolete sulci: elytra black, punctate-striated, the three alternate dorsal interstices with several oblong shining elevated tubercles: body and - legs black: palpi and antenne pitchy-brown. The elytra sometimes pitchy-brown, or dusky. The only specimens I have seen of this species were taken in the spring near “ Southend.” —Rev. F. W. Hope. B. Elytra with elevated lines. Sp. 7. fennicus. Fusco-ferrugineus, elytris griseis punctato-striatis, interstitiis alternis carinato-elevatis levibus. (Long. corp. 21—2? lin.) El. fennicus. Paykul.—He. fennicus. Steph. Catal. p. 57. No. 574. Dusky-ferruginous: head with the forehead obsoletely impressed: thorax broad, rather convex, broadest anteriorly, the lateral margins sinuated, the disc rugose-punctated with five sulci, the central one straight, the rest more or less flexuous: elytra somewhat convex, griseous, punctate-striated, the alter- nate interstices elevated, smooth; a little beyond the middle are some oblong elevated dusky or black spots on the carine ; and near the scutellum is an abbreviated punctate striola: body beneath pitchy-brown ; the abdomen pale ferruginous ; legs, palpi, and antenne pale testaceous; the tip of the latter rather obscure. Not common; taken occasionally in damp banks and hedges in Battersea-fields; also near Hertford, at Dover, and in Norfolk. “‘ Kaling, Middlesex, and Netley.”—-Rev. F. W. Hope. * Leith Hill.”— Mr. Waterhouse. Sp. 8. nubilus. Ovatus, griseo-testaceus, elytris punctato-striatis, nigro-nebu- losis, interstitiis alternis elevatis, crenulatis. (Long. corp. 12—2. lin.) El. nubilus. Olvier—He. nubilus. Steph. Catal. p. 57. No. 575. Griseous or testaceous-brown: head punctate; forehead with an impression: thorax short, convex, with the sides depressed, broadest in front, and bi- sinuated ; above with the disc punctate, with five sulci: elytra moderately convex, griseotls, with scattered brown clouds, punctate-striated, the alter- nate interstices elevated, and the carinule obsoletely crenulated: body fus- cous: legs testaceous: antenne and palpi pale, with the apex dusky. Manpiputata. Vou. II. Isr January, 1829. I 114 MANDIBULATA.—COLEOPTERA. Found in banks and damp sandy places not very abundantly. *¢ Strand-on-the-Green.”— Rev. F. W. Hope. * Copenhagen- fields.".—Mr. Ingpen. “ Glanville’s Wootton, and Hurne.”— J.C. Dale, Esq. Genus XCVII.—Ocurursius, Leach. Maxillary palpi shorter than the antenne, the terminal joint small, gracile, subulated ; the preceding thickened, with the apex tumid. Antenne with the basal joint long, slightly bent ; the second short, subglobose, followed by an arcuated, slender, internally acute, process ; the club elongate, six-jointed, the apicial joints rather stoutest, the terminal the largest and ovate: head large; eyes Slightly prominent; thoraz short, with the sides more or less dilated: body elliptic. The brevity of the palpi at once distinguishes this genus from the following, as their slender, acute, terminal joint does from the two preceding, from which the dilated margins of the thorax and the greater convexity of the elytra also remove it :—the want of longi- tudinal sulci on the thorax discriminates it from Helophorus, and the less prominent eyes and dilated thorax from Hydrochus. A. Elytra punctate-striated. Sp. 1. marinus. Viridi-aneus nitidus, thorace transversim impresso, elytris ob= scurtoribus punctato-striatis, pedibus pallidis. (Long. corp. 3—1 lin.) El. marinus. Paykul—Oc. marinus. Steph. Catal. p. 57. No. 576. Glossy brassy-green: head obsoletely punctulated, with several larger punctures on the crown: thorax very finely punctulated, with two transyerse arcuated impressions on the disc, which is rather elevated, and a bent obsolete fovea on each side; the lateral margins on each side behind and the anterior one have a kind of white membraneous appendage: the elytra are punctate- striated, slightly tinged with greenish-brass, with the apex paler: body black: legs and antenne pale. Var. 6. With the thorax pitchy-black. _ Inhabits brackish waters beneath aquatic plants. “ Pools of salt water on the banks of the Humber.”—W. Spence, Esq. ‘* South- end.”—Rev. F'. W. Hope. Sp. 2. dilatatus. MWigro-wneus, thoracis lateribus walde dilatatis, disco canali= culiculato postice subbifoveolato, pedibus piceis. (Long. corp. §—14 lin.) Oc. dilatatus. Leach MSS.—Steph. Catal. p. 57. No. 577. Closely allied to the last, but differs in having the sides of the thorax more dilated ; in colour, &c. Dusky-brass: head obscurely punctured, with some larger impressions on the crown: thorax with the sides considerably dilated, the dise with a longitudinal impressed line, terminating posteriorly in two HELOPHORIDH.—OCHTHEBIUS. 115 rather obsolete impressions placed transversely, the posterior angles with a curved depression on each: elytra rather convex, punctate-striated, the strie regular and rather deep: body dusky beneath: legs pitchy: antenne and palpi pale. Taken in Devonshire and near Swansea; also in the neighbour- hood of London, and in Norfolk. “ Spitchweek and Woodland, Devonshire.”—Dr. Leach. “ Southend.”—Rev. F. W. Hope. ** Parley-heath.”—J. C. Dale, Esq. Sp. 3. pygmeus. Fusco-ceneus, thorace unisulcato, elytris punctato-striatis, apice pedibusque rufo-picets. (Long. corp. —1} lin.) El. pygmeus. Fabricius.—Oc. pygmeus. Steph. Catal. p. 57. No. 578. Head punctate, dusky-brass, with a transverse impressed line, and two fove on the crown: thorax truncated anteriorly, with the sides rounded, above brassy- brown, slightly convex, deeply punctured, with an abbreviated channel in the middle, and an impressed bent fovea on each side: elytra ovate, slightly con- vex, brassy-brown, with the apex pitchy-red; the disc regularly but finely punctate-striated ; body pitchy-black: legs rusty-red: antenne and palpi pale, with the tips dusky. Not uncommon in stagnant waters in the neighbourhood of London. “ Bottisham.”—@ev. L. Jenyns. Sp. 4. impressus. Niger, thoracis lateribus utrinque foved magnd impressé, pedibus testaceis. (Long. corp. 3—14 lin.) Hy. impressus. MJarsham.—Och. impressus. Steph. Catal. p. 58. No. 579. Although this (so far as the original Marshamian specimens elucidate) appears a distinct species from the foregoing, and may be distinguished by its colour, as well as the magnitude of the lateral fovee on the thorax, it is nevertheless possible that it may prove to be a mere variety: prevailing colour deep shining black, sometimes obscurely glossed with eneous: head obsoletely punctate ; crown with larger impressions: thorax with the sides slightly di- lated, the disc a little brassy and glossy, with a longitudinal channel in the middle, and a deep fovea on each side near the margin: elytra deeply punc- tate-striated: legs testaceous: antenne and palpi pale. Not unfrequent in waters and ponds in the vicinity of London. *¢ Southend.”—Rev. F’. W. Hope. Sp. 5. bicolon. MNigro-eneus, subnitidus, thoracis lateribus utrinque bifoveolato, medio canaliculato, antennis pedibusque pallidé testaceis. (Long. corp. 4—1 lin.) Hy. bicolon. Kirby MSS.—Oc. bicolon. Steph. Catal. p. 58. No. 580. Slightly glossy eneous-black: head very obscurely punctured anteriorly, the crown with two or three fovee: thorax with arather deep central channel and two impressed fovee on each side between it and the margins, the latter de- _ pressed, slightly rugose and reddish: elytra rather convex, deeply and some- 12 ww 116 .MANDIBULATA.—COLEOPTERA. what coarsely punctate-striated, the strie regular: the body black beneath : legs and antenne pale testaceous, the latter palest. I obtained a pair of this insect from the Marshamian cabinet named as above. Aliso found near London, and I believe in Suffolk and Norfolk. I have one specimen from the west of England. “ Habitat in Scotia.” —Germar. Sp. 6. rufimarginatus. Brevis, latus, piceo-niger, thoracis lateribus pedibusque rufis, elyiris profundé crenato-striatis. (Long. corp. & lin.) Oc. rufimarginatus mihi. Steph. Catal. p. 58. No. 581. The comparative brevity and superior width of this species sufficiently point out its distinction: it is of a pitchy-black: head glossy, obscurely punctured, with some larger impressions on the crown: thorax rather convex, the lateral margins broadly rufous; the disc. with an abbreviated longitudinal channel and an obsolete transverse arcuated impression on each side towards the base ; elytra slightly glossy-black, rather pitchy or rufescent toward the apex, mo- derately convex, and somewhat deeply crenate-striated, the strie reaching to the apex: legs rufous: antenne and palpi rufescent, with the tips dusky. My specimens occurred near London. “ Netley.”—Rev. F. W. Hope. “Sp. 7. nanus. Miger, obscurus, thorace subfoveolato, elytris tenué punctato- striatis, pedibus rufo-testaceis. (Long. corp. 3—#? lin.) Oc. nanus mihi. Catal. Steph. p. 56. No. 582. Very minute: deep obscure black; the head and thorax slightly glossy, the former nearly smooth anteriorly, foveolated on the crown ; the latter with a slight dorsal channel and two shallow fovee on each side between it and the lateral margins: elytra faintly punctate-striated, the punctures somewhat re- mote: legs, antenne, and palpi testaceous, the former with a rufous tinge. The locality of this minute insect I do not remember, but it was not found in the metropolitan district. ‘‘ Southend.”’—Rev. iI’. W. Hope. Sp. 8. eratus. Splendide eneo-nitens, thorace, dorso canaliculato, disco foveolato, elytris obsoleté punctato-striatis, pedibus testacets. (Long. corp. ? lin.) Oc. eratus mihi. Steph. Catal. p. 58. No. 583. Of a brilliant glossy brass, obscurely tinged with cupreous: head smooth ar- teriorly, with the crown somewhat rugose, and foveolated: thorax smooth, glossy, the disc with a dorsal channel, two fovee on each side parallel with the same, and one placed behind the hinder fovea and the lateral margin, which is considerably depressed and has another fovea placed anteriorly : elytra very glossy, smooth, obsoletely punctate-striated, slightly pubescent: legs testaceous: antenne and palpi pale, with the tips dusky. Taken near London, and also in Glamorganshire. HELOPHORIDE.—HYDRENA. 11% B. Elytra punctate, not striated. Sp. 9. punctatus. Pirate XIV. f. 2. Subelongatus, wneo-nitens pubescens, thoracis disco sulco dorsali foveisque plurimis impressis, elytris punctatis, haud striatis. (Long. corp. 14 lin.) Oc. punctatus mihi. Steph. Catal. p. 58. No. 584. The largest_and most remarkable species of the genus; somewhat elongate, glossy-brass: head with an elevation on the front, the crown with two deep fovee: thorax with a central channel and four impressions on each side, the two lateral ones united together by an arched impressed line: elytra slightly glossy, somewhat pubescent, thickly and minutely punctured throughout: legs pitchy-testaceous, with the tarsi dusky: antenne and palpi testaceous, the apex of the latter dusky. I have little doubt that this will form the type of a new genus, as the form of terminal joint of the palpi appears to differ from that of the true Ochthebii ; and the antenne are somewhat elongate. It may be the Och. exsculptus, Degean. This singular insect, of which I have seen but two examples, was found either near Bristol or in Glamorganshire. ‘ Netley.”"— Rev. FF’. W. Hope. é Genus XCVIII.—Hyprana, Kugellan. Mazillary palpi about three times as long as the antenne; the terminal joint thickened in the middle, attenuated at each end, the basal short, straight, the second very long, bent, slender, the apex rather thickened, the following about half the length of the second, obscurely thickened at the tip. Antenne with the first joint elongate, bent, incrassated at the apex, the following short, ovate, succeeded by a slender subulated process, to which the club, which consists of six joints, the terminal largest, is attached: head large, porrect : eyes small, immersed: thorax subquadrate: body oblong: legs rather elongate ; tarsi long and slender. The extraordinary length of the maxillary palpi at once distin- guishes this genus from the other Helophoride. It is most probable that we have more than three species in England, as there are several known on the continent ; and among the specimens which I possess there is considerable diversity of appearance, though I have not ventured to consider them distinct, from not being thoroughly acquainted with the actual lccalities of the individuals. Sp. |. riparia. longata, piceo- aut brunneo-nigra, elytris creberrimé punctato- striatis, pedibus pallidé rufescentibus. (Long. corp. 1—}+ lin.) Hy. riparia. Kugellan. Steph. Catal. p. 58. No. 585. Proportionately more elongate than the other species of the genus, and of a superior bulk: head black, slightly convex, finely punctulate anteriorly, rather more deeply on the crown: thorax slightly convex ; the sides a little 118 MANDIBULATA.—COLEOPTERA. dilated, somewhat unequal; the disc thinly but finely punctured: elytra slightly convex, piceous or brownish-black, thickly punctate-striated: legs pale rufescent ; antenne and palpi paler, with the tips dusky. The size and colour vary considerably. I have occasionally taken this insect in ponds in the neighbour- hood of London, especially on Hampstead-heath. « Netley, Salop, and Tenbury.”—Rev. F. W. Hope. “ Glanville’s Wootton, and Parley-heath.”—J. C. Dale, Esq. Sp. 2. pusilla. Pare XIV. f. 3. Subovata, saturate nigra nitida, elytris obsolete punctato-striatis, pedihus rufis. (Long. corp. 3—I lin.) Hy. pusilla mihi. Steph. Catal. p. 58. No. 586. Broader and shorter than the preceding, of a darker colour, &c. Subovate ; deep glossy black: head obscurely punctured, the crown slightly rugose: thorax - very finely but thickly punctured, with a slight fovea near each posterior angle: elytra rather obsoletely but thickly punctate-striated: legs rufous: antenne and palpi rufescent, dusky at the apex. This is probably the Hydrena nigrita of Miller. See Germar Coleopterorum Species Nove, &e. p. 93. | Taken near London. “Netley and Tenbury.”—Rev. F. W. Hope. ‘* Midgley-moor near Halifax.,—Mr. Gibson. “ River Cawdor near Carlisle, and in a marsh near Ashburton, Devon- shire.”-—Dr. Leach. Sp. 3. minutissima. Ovata, nigro-picea, thorace canaliculato, elytris levibus, antennis pedibusque pallidis. (Long. corp. 4 lin.) iil. minutissima? Gyllenhal?—Hy. minutissima. Steph. Catal. p. 85. No. 587. Ovate pitchy-black: head glossy, obtuse; eyes rather large, globose: thorax black, shining, convex, behind with a slight channel in the middle, and a minute fovea on each side: elytra ovate, convex, smooth, glossy pitchy-black, the ‘ apex paler: body black: legs, antenne, and palpi pale. I have a single indigenous species agreeing with the above description. I am not aware of the exact locality of this insect. Famity XIV.—HYDROPHILIDA, Leach. Antenne generally nine- rarely six-jointed, perfoliate-clavate, the club distinctly cleft. Mandibles bidentate at their extremities ; maxillary palpi very long, usually filiform; body oval or somewhat rounded, frequently nearly globose : thorax short, transverse: thie slightly spinose ; tarsz five-jointed, filiform, the posterior sometimes ciliated, the basal joint minute, the second longer than the rest. The bidentate mandibles enable us with facility to discriminate HYDROPHILIDH.—LIMNEBIUS. 119 this family from the foregoing : the species of which it is composed are more truly aquatic than the Helophoride, and the typical species swim with dexterity by means of their paddle-like tarsi: they prey upon small aquatic mollusca and insects, in their first and final states; but their voracity is far inferior to that of the Hydrade- - phaga. | The British genera, which have received no accession to their numbers since they were published by Dr. Leach, may be thus known: { simplex ; § truncata: . . . $9. LIMNEBIUS. Elytra apice { integer ; 2 integra; (sessiles: . . 104. Hyprosius. Sternum + Oculi prominuli: 103. BERosvus. Clypeus + (spiniforme; Antenne ( acuminato: . 100. Hyprots. articulo ultimo obtuso: . . 101. HyDROPHILUs. (emarginatus : : He ee ; ; 5 . 102. SPERCHEUS. Genus XCIX.—Limnesius, Leach. Mazillary palpi elongate, the basal joint minute, the rest of nearly equal length, the second and third somewhat thickened at the apex, the terminal rather slender, slightly attenuated at each extremity. Antenne short, slender at the base, with an elongate six-jointed club: head ovate, moderate: eyes moderate : thorax short, transverse, slightly convex, dilated at the sides: body somewhat depressed ; elytra rather oblong, truncate at the apex: scutellum broad; legs moderate: tibie slightly spinous: posterior tarsi ciliated. The truncate elytra and inferior bulk sufficiently point out this genus at first sight; but other very evident characters of discri- mination may be remarked, such as the depressed body, which distinguishes it from Hydrobius and Berosus, and the simple ster- num, by which it is known from Hydrotis and Hydrophilus; and the integrity of the clypeus, which separates it from Spercheus. The species have been much neglected, but from the examination of a considerable number of specimens, the following appear to be distinct. | Sp. 1. ater. Prats XIV. f. 4. Atro-piceus, nitidissimus, thoracis lateribus elytro- rumque marginihus dilutioribus, pedibus piceis, tibiis tarsisque pallidiorcbus. (Long. corp. 1—1? lin.) Li. ater mihi. Steph. Catal. p. 58. No. 588. Ovate obtuse ; of a deep glossy pitchy-black, with the lateral margins of the 4a 120 ~"" MANDIBULATA.— COLEOPTERA. thorax and the edges of the elytra rufescent: the femora pitchy, with the tibie and tarsi paler. It varies in being of a paler or pitchy hue above; or sometimes approaching to castaneous. Distinguished by its superior size, and the obtuseness of its posterior outline, as well as by the general intensity of its colour and glossiness. Found near London; in Devonshire, Glamorganshire, Norfolk, and “ Glanville’s Wootton.”—J. C. Dale, Esq. ‘ Halifax.”—Mr. Gibson. Sp. 2. affinis. Oblongo-ovutus, postice subattenuatus, nigro nitidus, thoracis elytrorumque marginibus concoloribus, femoribus nigris, tibiis tarsisque rufes- centibus. (Long. corp. 13—13 lin.) Li. affinis. mihi. Steph. Catal. p. 58. No. 589. Oblong-ovate, acuminated behind ; glossy black, with the margins of the thorax and of the elytra concolorous, the apex of the latter rounded: femora black, tibiz and tarsi rufescent. The attenuated posterior outline and deep concolorous margin to the thorax and elytra sufficiently distinguish this species from the foregoing. My specimens were captured in the metropolitan district. Sp. 3. truncatellus. Brevis, ovatus, posticé obtusus, levissimus, ater, thoracis elytrorumque marginibus concoloribus, pedibus piceis. (Long. corp. 1—1+ lin.) | Hy. truncatellus. Fabricius.—Li. truncatellus. Steph. Catal. p. 58. No. 590. Short, ovate, posteriorly obtuse, very smooth, deep black, with the lateral margins of the thorax and elytra concolorous; the legs pitchy; the palpi slightly ru- fescent. The inferior size and brevity of this species, exclusively of the dissimilarity in form, sufficiently discriminate it from Li. affinis. Perhaps the most abundant species of this genus; occurring in plenty in some ponds near London, and not unfrequent in Norfolk and Suffolk, judging from the number of specimens I have seen from thence. ‘“ Netley.”—Rev. F. W. Hope. Sp. 4. marginalis. Brevis, ovatus, niger, nitidus, thoracis angulis posticis elytro~ rumque marginibus piceo-testaceis, pedibus pices. (Long. corp. 1 lin.) Li. marginalis mihi. Steph. Catal. p. 58. No. 591. Short, ovate, glossy black, with the posterior angles of the thorax and the lateral margins of the elytra pitchy-testaceous ; the legs pitchy. The apex of the elytra is sometimes slightly rufescent. Smaller and somewhat more obtuse and broader than the last, from which it is also distinguished by the coloured margin to the thorax. Found near London and in Devonshire. ‘“ Netley."—Rev. F. W. Hope. 7 HYDROPHILIDZ.—LIMNEBIUS. 121 Sp. 5. nigricans. Oblongo-ovatus, obtusus, niger, levis, nitidiusculus, pedibus picets. (Long. corp. $—14 lin.) Dermestes nigricans. Marsham.—Li. nigricans. Steph. Catal. p. 58. No. 592. Oblong-ovate, obtuse, smooth, slightly glossy-black, the margins of the thorax and of the elytra concolorous ; the legs and antenne pitchy. It varies in being of a pitchy testaceous hue, with the antenne and legs paler : probably immature. Not an uncommon species near London; and I believe in other parts. ‘Common near Kimpton.”—Kev. G. T. Rudd. “ Botti- sham.”—Rev. L. Jenyns. “ Glanville’s Wootton.”—J. C. Dale, Esq. Sp. 6. lutosus. Oblongo-ovatus, nigro-fuscous, elytris obsoletissimée punctato= striatis, pedibus piceis. (Long. corp. ? lin.) Hy. lutosus. Marsham.—Li. lutosus. Steph. Catal. p. 58. No. 593. Oblong-ovate, dusky-black, or brown, with elytra very obsoletely punctate- striated, the legs piceous: the thorax rugose, with transverse elevated flexu- ous lines. | The obsoletely punctate-striated elytra well characterizes this species; as well as the rugosity of the thorax. This species I obtained from the Marshamian Cabinet. I am not aware of its locality. Sp. 7. mollis. Ater, nitidus, thorace elytris pedibusque fusco-testaceis. (Long. corp. 4 lin.) Hy. mollis. Marsham.—Steph. Catal. p. 59. No. 594. Ovate, slightly acuminate, rather convex, black, shining, with the thorax, elytra, and legs testaceous brown, the margins of the former palest. The black head and abdomen of this minute species, as well as its inferior size, distinguish it from all the foregoing. Li. mollis is not uncommonly taken in the ponds about London. ‘¢ Bottisham.”— Rev. L. Jenyns. Sp. 8. picinus. Ovatus, acuminatus, subconverus, piceus nitidus, thoracis mar- ginibus dilutiorihus, pedibus pallidé testaceis. (Long. corp. } lin.) Hy. picinus. Marsham.— i. minutus. Steph. Catal. p. 59. No. 595. Ovate, acuminate, slightly convex, shining piceous, the margins of the thorax rather paler, the legs pale testaceous, or rufescent. This is known by its small size, superior convexity, and the acumination of its posterior extremity. Of this insect I have examined but one example, which I pro- ‘cured from the Marshamian Cabinet. 122 MANDIBULATA.—COLEOPTERA. Sp. 9. nitidus. Ovatus, depressus, ater nitidus, margine thoracis pedibusque pala lidé rufis. (Long. corp. 4—? lin.) Hy. nitidus. Marsham.—Li. nitidus. Steph. Catal. p. 59. No. 596. Ovate, depressed, glossy-black, with the margin of the thorax and the legs pale rufous, or piceous. Distinguished by its depressed form and minute bulk from all the foregoing. Of Li. nitidus I have also only seen my own pair, which were ob- tained from the same source as the preceding. Genus C.—Hyprouvs, Linné MSS. Mazillary palpi very long, the basal joint minute, the second very long, robust, subclavate, the third shorter and more slender, the terminal about half the length of the third, slenderer and elongate-ovate: l/abrum transverse-oval, entire: mandibles large, emarginate at the apex, with several strong bifid teeth in their inner edges: Antenne nine-jointed*, the basal joint robust, bent, attenuated at the base, the next oblong, the three following transverse, the remainder forming the club, of which the terminal joint is acuminated ; head broad, obtuse: eyes not very large: elytra posteriorly attenuated: ster- num terminating in an acute spine, reaching considerably beyond the in- sertion of the posterior legs; four posterior tarsi compressed, ciliated on the - inner margin, and formed for swimming ; claws bifid; and two anterior tars¢ of the male with a triangular dilatation, and two robust simple unequal claws. Hydro is readily known by the integrity of the labrum, bifid posterior claws, attenuated elytra, and superior bulk; as well as from the magnitude and internal denticulation of its mandibles ; and, like the Dytici, the males are remarkable for the great size of the terminal joint of the anterior tarsi. Sp. 1, piceus. Olivaceo-niger, nitidus, elytris octo striatis, interstitiis inter= mediis lined punctorum impressorum, antennis rufescentibus. (Long. corp. 1 une. 4—6 lin.) Hy. piceus. Linné—Hy. piceus. Steph. Catal. p. 59. No. 597.—Curtis, v- pl. 239. With the exception of Lucanus Cervus and Melolontha Fullo, this is the largest of the indigenous Coleoptera: of a glossy olivaceous-black, the margins of the elytra purpurascent or greenish: head smooth, with a deep punctate im- pression above the eyes and on the forehead; thorax smooth, with some punctures on the lateral margins, and two more or less evident punctate fovec * « (Olivier remarks that the antenne of Hydroiis piceus are in fact eleven- jointed, the eighth and tenth joints being very minute, their place being marked out by the distances which intervene between what are commonly considered _ the second and third, and the third and last joints of the clava.’—Mac Leay. HY DROPHILIDZ.—HYDROPHILUS. 123 on the disc towards the anterior margin: elytra large, elongate, each with eight simple striz, the alternate interstices with a continuous series of irregu- larly-impressed dots, which, with the strie, are deepest towards the apex, and somewhat evanescent anteriorly: breast clothed with a yellowish pubescence ; abdomen deep black, with luteous marginal spots ; legs pitchy, with the tarsi rufescent towards the apex. Both sexes vary much in colour; the female is rather broadest. The larva dusky, with smooth chestnut-coloured head, slender legs, and attenuated tail: it feeds voraciously on mollusca, and changes in June beneath dung, making a deep hole for the purpose: about August the imago appears: the female deposits her eggs symmetrically, in a nest composed of a gummy matter, which she spins out of her abdomen, in which receptacle they float about till they are hatched. Not uncommon in many situations in the vicinity of the metro- polis; in a ditch by the junction of the Croydon and Surrey canals, in brick-fields near Chelsea, ponds near Hampstead, E:pping-forest, &e. “ River Cam, Bottisham-fen, &c.”— Rev. L. Jenyns. ‘ Com- mon in ponds in Copenhagen-fields.”"— Mr. Inepen. “ Whittlesea- mere, June.”—Messrs. Chant and Bentley. ‘* Yaxley-mere.”— J. G. Children, Esq. ‘ Glanville’s Wootton.”-——J. C. Dale, Esq. “‘ Kaling and Paddington.”— Rev. F. W. Hope. | Genus CIl.—Hypropuitus Auctorum. Mazillary palpi nearly as in Hydroiis, but less robust, and the terminal joint subfusiform: labrum transverse, emarginate: mandibles ciliated on the inner edge, acute and bifid at the apex. Antenne nine-jointed ; basal joint robust, abruptly bent, and attenuated near its origin ; second elongate, and with the three following, which are transverse, rather slender; the remainder forming the club, the terminal joint of which is somewhat obtuse, and obliquely truncate: head ovate; eyes small, reniform: elytra convex, broad poste- riorly: sternum terminating in a slightly acute spine, which scarcely reaches beyond the insertion of the posterior legs: legs not very stout; the four pos- terior tarsi compressed, ciliated on each side, and formed for swimming ; anterior simple in each sex: claws dentate at the base, greatly incurved. The genus Hydrophilus differs from Hydrous by having the labrum emarginate, the mandibles ciliated internally, without pro- minent teeth, the antenne more obtuse at the apex, and the body obtuse and somewhat dilated behind: from Spercheus and the fol- lowing genera the acuminate sternum distinguishes it. ‘The larva somewhat resembles that of Gyrinus. Sp. 1. caraboides. Niger nitidus, elytris striis quinque punctatis, lateralibus sub- confluentibus. (Long. corp. 8—10. lin.) 124: MANDIBULATA.—COLEOPTERA. Hy. caraboides. Linné.—Hy. caraboides. Curtis, iv. pl. 159. Steph. Catal. p. 59. No. 598. Entirely black or of a glossy violet, sometimes slightly greenish : head with a waved series of punctures on each side, and a deep fovea near the eyes: thorax with scattered punctures on the sides, and two oblique punctate fovee on the disc anteriorly: elytra elongate-convex, with five punctate strie, the two lateral ones somewhat confluent; between the strie are two very obsolete impressed lines: body slightly pubescent beneath; legs black; tibiae and tarsi piceous: antenne and palpi ferruginous; the club of the latter black. Var. 8. Violaceous-brown, the elytra obsoletely sulcate; legs pale ochraceous. Apparently immature. Larva pale ochraceous-brown, with the anterior segments darker ; it has seven fascicles of hair down each side; and the caudal segment has two filiform processes :—the pupa is slightly hairy anteriorly, and the apex of the abdo- men has a large and powerful bifid process. Not uncommon during the greatest part of the year in the ponds and ditches round London, but rare in the north of England. “ Bottisham, common.”—Rev. L. Jenyns. * Whittlesea-mere.”— J.C. Dale, Esq. ‘* Karl’s Court, in the canal, abundantly.” —Mr-. G. Waterhouse. ‘ Kpping.”—Mr. H. Doubleday. Genus CII.—Spercueus, Fabricius. Maxillary palpi as long again as the labial, the terminal joint elongate-ovate, attenuated at the base, acute at the apex; labrum transverse-quadrate: man- dibles much bent externally, the apex acute, with acute divaricating teeth: mawille with the external lobe palpiform, slender, subulated, the apex setose. Antenne apparently six-jointed, the basal joint longest, conic-cylindric ; the remainder forming a cylindric club: head large: eyes prominent: clypeus ~ emarginate: body ovate, gibbous: sternum simple: tibie angulated, smooth: tarsi with the four basal joints short, the terminal large, obconic ; with two short equal claws. The convex body and emarginate clypeus at once distinguish Spercheus from the other Hydrophilide; but the more essential characters of the external palpiform lobe of the maxille, and ap- parently six-jointed antennz, may be remarked. ‘The species in- habit stagnant waters, adhering to the roots of plants. Sp. 1. emarginatus. Supra pedibusque nigricanti-ferrugineis, elytris lineis ele- vatis subobsoletis, corpore infra nigricante. (Long. corp. 3—3é lin.) Sp. emarginatus. Mabriczus.—Steph. Catal. p. 59. No. 599. Obscurely glossy-fuscous : head flat, unequal, punctate, dusky-black : eyes black : thorax slightly convex, rugose-punctate, the disc pitchy-brown, the lateral margins pale: scutellum eclongate-acuminate: elytra gibbous, coarsely and HYDROPHILIDA.—BEROSUS. 125 rather irregularly punctate-striate; the alternate interstices more elevated, espe- cially posteriorly, ashy-brown, with scattered dusky spots, especially towards the suture: body beneath fiat, black ; legs dusky-ferruginous, or pitchy, with the tibie and tarsi paler; palpi and antenne pale-testaceous ; the club of the latter fuscous. _ Hy. verrucosus of Marsham is a mere variety of this species, being obscure above, and having the sides of the abdomen slightly verrucose. This rare insect has not often been captured in England ; speci- mens have however occurred at Windsor and near York; and Dr. Leach once picked up a fragment of one in Kensington-gardens. “¢ One pair taken in July, 1824, in Yaxley-fen.”—Mr. Chant. Genus CI1I.—BErosus, Germar. Mazillary palpi thrice as long as the labial, basal joint very minute, second elongate, clavate, third about half the length of the second, robust, attenuated at the base, terminal nearly as long as the second, subfusiform, truncate: labrum transverse, anterior margin rounded, entire, mandibles tridentate at the apex. Antenne apparently eight-jointed, the basal joint stout, elongate, clavate, second slender, about half the length of the preceding, attenuated at the apex, the three following small, the remainder forming the club, of which | the terminal joint is large and subglobose: head nutant: eyes slightly promi- nent :. clypeus entire: thorax convex: elytra globose, broader than the thorax, the apex entire: sternum simple: tibie slightly spinose: posterior tars? na- tatorious, ciliated. From the preceding genus Berosus differs in having the clypeus entire, the external lobe of the maxillz not palpiform, the an- tenne distinctly more than six-jointed, and the thorax more globose and narrower than the elytra; and from Hydrobius by the promi- nence of its eyes, the different proportions of the maxillary palpi, the comparative smallness of the thorax to the elytra, and the obtuse terminal joint of the antenne. Sp. 1. luridus. Oblongo-ovatus, griseo-flavescens punctulatus, capite maculdque thoracis medio subquadrataé anticé attenuaté cwneo-viridibus. (Long. corp. 24—2? lin.) Hy. luridus. Linné.—Mart. C. pl. 33. f: 10.—Be. luridus. Steph. Catal. p. 59. No. 600. i Oblong-ovate: griseous-yellow ; head thickly and finely punctate, of a brilliant brassy-green: thorax also thickly punctured, with a subquadrate anteriorly narrowed brassy-green spot on the disc: elytra crenate-striated, the inter- stices finely and regularly punctulated, the striae with minute fuscescent spots, and several scattered larger spots on the disc, which are variously placed in 126 MANDIBULATA.—COLEOPTERA. different specimens: legs pale, with the base of the four posterior femora and the tips of the tibie and tarsi dusky, or black. Far from uncommon in the metropolitan district; also taken in Norfolk, Suffolk, Devonshire, and near Swansea. <“ Ponds near Cambridge.”— lev. L. Jenyns. “ Southend.’—Rev. F. W. Hope. “¢ Wandsworth-common, abundantly.” —Mr. Ingpen. Sp. 2. ericeps. Ovatus, ochraceo-flavescens, punctulatus, capite vittique didyma thoracis cupreo- aut nigro-eneis. (Long. corp. 24—3 lin.) Hy. ericeps. Spence MSS.—Be. ericeps. Steph. Catal. p. 69. No. 601.— Curtis, v. pl. 240. 2. Larger and more globose than the foregoing, of a more ochraceous hue, and the punctures on the head and thorax more remote and shallow: head cupreous or brassy-black, sometimes tinged with cupreous; thorax light ochraceous, with two longitudinal or parallel lines on the disc, divided by a ferruginous streak, and slightly rounded externally: elytra very globose, crenate-striated, the strie more or less fuscescent, and the interstices punctured, the intermediate ones more deeply so, and more or less spotted in different individuals with dusky or black: legs pale, the four posterior dusky at the base. Var. 2. With the spots on the thorax united. Less frequent than the foregoing, but far from uncommon round London: also found in Norfolk and Devonshire. “ Wandsworth- common, abundantly."—Mr. Ingnen. “ Southend.”—Rev. F. W. Hope. “ Bottisham.”—Rev. L. Jenyns. Sp. 3. globosus. Prats XIV. f. 5. Sub-oblongo-ovatus, griseo-flavescens, vagé punctatus, capite maculdque thoracis medio nigro-cneis, hac carinulé longi- tudinali ferrugined. (Long. corp. 24 lin.) Be. globosus. Curtis.—Be. obsoletus mihi. Steph. Catal. p. 59. No. 602. Subelongate, ovate, obtuse ; griseous-yellowish, deeply punctured: head brassy- black, with sometimes a minute ferruginous spot on the forehead ; thorax with an irregular, externally dentated, greenish or brassy-black spot on the disc, having an abbreviated longitudinal ferruginous carina in front: elytra deeply , crenate-striated, and very dusky, the interstices thickly punctured, and more or less spotted with black: legs pale ferruginous, with the base of the four posterior dusky. Probably Hydrophilus signaticollis of Megerle, an undescribed species. I detected this species long since, and gave its locality to Mr. Ingpen, who published it by my MS. name in his useful “ In- structions ;” and have captured a single specimen near Londen, I believe at Hertford, and obtained others from Whittlesea-mere. “‘ Bottisham.”’—/ev. L. Jenyns. ‘* Whittlesea-mere, June and July.”— Messrs. Chani and Beniley. HYDROPHILIDZ.—HYDROBIUS. ) 127 Genus C1V.—Hvyprostius, Leach. Mazillary palpi considerably longer than the labial, the basal joint minute, the second elongate-clavate, third and fourth of nearly equal length, the latter elongate-ovate, obtuse: /abrum transverse, entire. Antenne nine-jointed ; the basal joint robust, elongate, clavate, the second shorter and more slender, attenuated at the apex; the following nearly of equal length, clavate ; the two next short, transverse; the remainder forming the club, the terminal joint being acuminated: head ovate: eyes small, not prominent: clypeus entire: body more or less convex: elytra entire, obtuse: sternum simple: tibie slightly spinose: posterior tarsi natatorious, ciliated: claws simple. Hydrobius, the last of the aquatic genera, differs from the other Hydrophilide by the greater convexity of the body, which is posteriorly obtuse: the clypeus is entire, the scutellum small, the sternum simple, the antenne nine-jointed, with the terminal joint large, somewhat compressed and acuminated. In the first subdi- vision of the second section of the genus, the maxillary palpi are very long, and the terminal joint is considerably shorter than the third; and in the succeeding subdivision they are abbreviated, and - have the terminal joint longer than the third: they may probably form different genera hereafter. A. Body more or less elongate. a. Hlytra striated throughout. Sp. 1. picipes. Oblongus, nigro-piceus, nitidus, punctatus, pedibus dilutioribus, tibiis tarsisque rufescentibus, elytris obsolete striatis. (Long. corp. 34—4. lin.) Hy. picipes. Fabricius.—Steph. Catal. p. 60. No. 603. Oblong, deep pitchy-black, or obscurely eneous, shining: thickly and finely punctate: head with a few larger punctures on the sides and near the eyes: thorax also with some larger impressions on the lateral margins ; and two slight foveze on the disc towards the anterior edge: elytra obsoletely striated, the striz composed of remote impressions, the alternate interstices with an irregular line of larger punctures: body dull black beneath: legs piceous, with the tibiz and tarsi rufescent or rufo-ferruginous. Var. 6. Rather broader; more coarsely and thickly punctate, with the strie on the elytra more distinct; the palpi pale testaceous, with the apex black, and - the legs pale rufo-testaceous with the femora dusky. Probably a distinct species. Not very common near London, but more abundant in the marshes towards the mouth of the Thames. “ Lake of Killarney.”— Dr. Leach. “ Southend.”—Rev. F. W. Hope. “ Whittlesea-mere.” Messrs. Chant and Bentley. ‘°° Brackish waters near Gravesend, not uncommon.”—WMessrs. Stone and Bainbridge. 128 ‘MANDIBULATA.—COLEOPTERA. Sp. 2. fuscipes. Ovalis, nigro-piceus, punctatissimus, elytris regulariter striatis, — pedibus fusco-piceis, tarsis rufis. (Long. corp. 31—3} lin.) Hy. fuscipes. Linné.—Mart. C. pl. 33. f. 15.—Hy. fuscipes. Steph. Catal. p. 60. No. 604. Shorter but scarcely narrower than the last: oval, pitchy-black, thickly but not very coarsely punctulate, with some larger impressions on the head, and on the sides of the thorax: elytra rather faintly punctate-striate, the interstices thickly and finely punctulated, the alternate ones with some deeper impres- sions: body beneath dull black: legs piceous, with the tarsi rufescent: palpi ferruginous: antenne with the club black. Var. 6. With the legs pale rufo-testaceous, the base of the femora dusky. Common in every pond and collection of water throughout the metropolitan district. ‘ Southend and Kensington-gardens.”— Rev. F. W. Hope. “ Bristol.”—Dr. Leach. “ Glanville’s Wootton, and Scotland.”—J. C. Dale, Esq. Sp. 3. chalconotus. Ovalis, cupreo- aut aneo-niger, vel splendidé viridi-eneus, vage punctatus, elytris subcrenato-striatis, pedibus piceo-testaceis, tarsis dilu~ tioribus. (Long. corp. 3—3é lin.) Hy. chalconotus. Leach MSS. Steph. Catal. p. 60. No. 605. More coarsely punctured than the last: .colour very variable, coppery or brassy- black, or of a splendid greenish-brass, sometimes violaceous or bright green: head and thorax as in the preceding, but the punctures deeper: elytra more deeply striate, the strie slightly crenulate: legs pitchy-testaceous, with the tarsi paler, and the base of the femora dusky. The difference in sculpture, and usually brilliant metallic colouring, discriminates this from the foregoing insect. Also very common throughout the metropolitan district, and I believe in other parts. ‘* Spitchweek, Devonshire.”"— Dr. Leach. ‘“¢ Bottisham.”— Rev. L. Jenyns. Sp. 4. subrotundus. Brevis, subglobosus, nigro-piceus, vagé et creberrimé punc- tatus, elytris profundé punctato-striatis, pedibus nigro-piceis. (Long. corp. 23—23 lin.) Hy. subrotundus mihz. Steph. Catal. p. 60. No. 606. Short, subglobose, pitchy-black, coarsely and thickly punctate: elytra rather deeply punctate-striate, the interstices alternately with deeper impressions: body beneath dull black: legs pitchy-black. | The inferior size and short subglobose form, with the coarseness of the sculp- ture, distinguish this from all the preceding species. Found near London by myself; I also obtained one specimen from the Marshamian Cabinet. | HYDROPHILIDEH.—HYDROBIUS. 129 b. Elytra with one stria at the suture, or plain. Sp. 5. melanocephalus. Ovatus, niger, thorace pallido, disco nizro, elytris pal- lidis, strid suturali impressd. (Long. corp. 2—3 lin.) Hy. melanocephalus. Fabricius.—S‘eph. Catal. p. 60. No. 607. - Ovate, black; finely punctured: head punctulated, black, with a pale marginal lunule before each eye: thorax finely and thickly punctured, pale griseous- testaceous, with a discoidal and two contiguous spots black: elytra oblong, pale griseous, with a dusky humeral spot, and a deep stria parallel with the suture: body dull black beneath, pubescent: legs pale ferruginous ; femora generally pitchy-black. Var. 8. Rather larger, with the thorax obsoletely spotted with dusky; the crown darker, and frequently a longitudinal fuscous stria on the forehead. Var. 1. Steph. Catal.1.c. With the head immaculate black ; the thorax with its disc black ; its margins and the elytra castaneous-red. Plentiful in Battersea-fields during April and the beginning of May; and far from uncommon in other places round London at the same season, and in Norfolk. ‘* Bottisham, not common.”—Rev. L. Jenyns. “ Southend.”— Rev. F. W. Hope. Sp. 6. torquatus. Supra griseo-testaceus, vertice thoracisque disco obsoletixs infuscatis, elytris subtiiius punctulatis, strid suturali profund2 impressd. (Long. corp. 22—31 lin.) | | Hy. torquatus. Marsham.—Hy. melanocephalus £. Steph. Catal. p. 60. No. 607. Much larger than tne last, the colour paler, less glossy, the punctures on the thorax and elytra smaller in proportion, &c. Above griseous-testaceous ; head more or less clouded with fuscous: thorax with an obsolete brown cloud in the middle: elytra rather paler, very finely punctulated, with a deep stria on each near the suture, sometimes sprinkled with blackish dots towards the base, the apex generally immaculate: body punctulated beneath and black: femora at the base and beneath black ; the apex above with the tibie and tarsi pale testaceous. This is the Hydrophilus grisescens of Gyllenhal, which I con- ceived might be a variety of the foregoing insect when my Catalogue was printed. I am now of a different opinion. Found near Hertford and Ripley in the spring. Sp. 7. testaceus. Ovatus testaceus, vertice corporeque nigris, pedibus pallidis, elytris stria suturali impressé. (Long. corp. 24 lin.) Hy. testaceus. Fabricius. Steph. Catal. p. 60. No. 608. Closely allied to the foregoing, of which it may possibly prove to be a variety: rather smaller: the body beneath dull black; the crown glossy-black; the head anteriorly, thorax, and elytra immaculate testaceous ; the legs pale; the upper surface very finely and thickly punctulate. Taken occasionaliy near London in the spring. Manopigputata. Vou. II. Ist Fesruary, 1829. K 130 MANDIBULATA.—COLEOPTERA. Sp. 8. ochropterus. Oblongo-ovatus, niger, elytrorum thoracisque lateribus lu- ridis, maculé ante utrumque oculum lurida ; elytris strid suturali impressa. (Long. corp. 2 lin.) Hy. ochropterus. Marsham.—Steph. Catal. No. 60. p. 609. Still less than the foregoing, which it greatly resembles: oblong-ovate, thickly and finely punctulated ; black, with the lateral margins of the thorax and elytra lurid; the head black, with a lurid spot before each eye: body dull black beneath: legs pale testaceous, with the tarsi rufescent. This is apparently very distinct from all the preceding species of this genus :—I obtained one specimen from Mr. Marsham’s cabi- net, and possess others captured near London :—it also occurs in Norfolk. Sp. 9. fulvus. Oblongo-ovatus, niger, capite fulvo, thorace flavescente, disco im- maculato, elytris flavescentibus, lineis obscuris nigris strid suturali impressd. (Long. corp. 24—23 lin.) Hy. fulvus. Marsham.—Hy. bicolor. Steph. Catal. p. 60. No. 610. Allied to Hy. melanocephalus: black: head punctate, fulvous, or dusky: eyes black: thorax yellowish or fulvous, disc immaculate, sometimes dusky an- teriorly: elytra fulvous or flavescent, with obsolete logitudinal dusky lines, and a deep stria parallel with the suture: abdomen dull black, pubescent : legs testaceous with dusky femora. The Hy. fulvus of Marsham, which I formerly supposed to be synonymous with Hy. bicolor of Paykul, proves, upon a re-examination of the authentic Marshamian specimens, to be totally distinct ; I have therefore restored the name of the former author. Not uncommon during the spring throughout the metropolitan district. ‘ Glanville’s Wootton, Dorset.”—J. C. Dale, Esq. ‘¢ Southend.” —Rev. F. W. Hope. Sp. 10. lividus. Oblongo-ovatus paulo depressus, supra griseo-flavescentibus punc- tatissimus, strid suturali nulla, palpis longissimis. (Long. corp. 24 lin.) Hy. lividus. Forster.—Hy. griseus. ILlliger.—Steph. Catal. p. 60. No. 611. Rather more oblong and less convex than the preceding: above pale griseous- yellow or ochraceous, very finely and delicately punctulated: head with the crown rather dusky : thorax sometimes with obsolete fuscous clouds: elytra griseous, thickly punctulated throughout, but not striated ; sometimes with a few dusky longitudinal streaks: body beneath dusky-black : legs ferruginous, with the femora dusky : palpi extremely long, pale, with the apex black, or dusky. Va. 6. Steph. Catal.1.c. With the thorax and elytra variegated with dusky spots and lines. Plentiful during April in ponds in Battersea-fields, at Hertford, HYDROPHILIDZ.—HYDROBIUS. 131 Ripley, in Norfolk, &c. “ Bottisham, not common.” — Rev. L. Jenyns. * Common at Kimpton.”—Rev. G. T. Rudd. South- end.”— Rev. I’. W. Hope. Sp. 11. marginellus. Oblongo-ovatus, ater nitidus, thoracis elytrorumque mar- gine griseo-rufo, strié suturali unicd. (Long. corp. 14—2 lin.) Hy. marginellus. Fabricius. Steph. Catal. p. 6). No. 612. Oblong-ovate, deep glossy-black, thickly punctate, with the lateral margins of the thorax and of the elytra griseous-red: head with a fovea over each eye: thorax with too larger impressions on the disc anteriorly: elytra with a single Stria on each parallel with the suture: body and legs obscure black: tarsi rufescent : palpi and antenne pale testaceous, the latter with the club dusky. Var. 6. With the anterior margin of the thorax broadly griseous-red. Not common near London, but found occasionally; also taken near Kingston-upon-Hull. ‘“ Southend.’”—Rev. F. W. Hope. *¢ Ponds in Copenhagen-fields.”— Mr. Ingpen. Sp. 12. affinis. Oblongo-ovatus, niger punctatissimus, thoracis lateribus ely- trisque fusco-cinerets, strid suturali unicd. (Long. corp. 143—13 lin.) Hy. affinis. Paykul. Steph. Catal. p. 61. No. 613. Size and form of the preceding insect: head thickly punctate, black ; thorax black, with the lateral margins broadly testaceous-brown, the disc punctulate throughout: elytra oblong, thickly and finely punctate, obscure griseous or testaceous brown, with the suture darker, and a single stria on each, not reaching to the base, parallel with the suture: body beneath and femora dull black: tibie and tarsi ferruginous. Var. 8. With the head alone black, the thorax and elytra pale testaceous. This variety is the Hydrophilus margipallens of Marsham, of which I possess an authentic specimen. In Entomologia Britannica its length is stated to be 3 line by a typographical error, which the author has corrected in his MS. copy ; and without the assistance of the latter the species intended could never have been ascertained. Also taken occasionally near London, but far from common. ‘“¢ Southend.”— Rev. F. W. Hope. B. With the body subglobose. Sp. 13. atricapillus. Piare XIV.f.6. Niger punctulatissimus, thorace elytris capitisque punctis duobus lurido-testaceis, elytris postice obsolete punctato- striatis, suturali profundiori. (Long. corp. 2-24 lin.) Hy. atricapillus, Marsham MSS. Steph. Catal. p. 61. No. 614. Body and head black, the latter with a lurid or fulvous lunular spot on each side before the eyes; the thorax and elytra immaculate lurid-testaceous, thickly but finely punctulated ; the latter with a rather deep stria parallel with K 2 132 . MANDIBULATA.—COLEOPTERA. the suture, and towards the apex somewhat obsoletely punctate-striated : palpi and antenne testaceous, the latter with a black club. Var. 8. With the elytra obsoletely clouded with dusky towards the lateral mar- gins, near the apex. This species is the Hydrophilus bicolor of Paykul, v. i. p. 184; a name which cannot be retained, Fabricius having previously applied it to a different species of this genus; I have therefore employed that by which it has been so long known in this country, in preference to coining a new one, and thereby unnecessarily add to the nomenclature. I have occasionally captured this insect during the spring in Copenhagen-fields and near Hertford, and once at Ripley, but it is not very abundant near London. ‘* Wandsworth-common.”— Mr. Ingpen. ‘“* Near Norwich in April 1803, by Rev. W. Kirby.” Marsham’s MSS. “ Southend, rather plentifully.”—Rev. F. W. Hope. ‘* Lawrence Waltham.”—Mr. S. Hanson. Sp. 14. orbicularis. Ater-nitidus, supra creberrimé punctulatus, elytris strid suturali unici. (Long. corp. 2—23 lin.) Hy. orbicularis. Fabricius.—Steph. Catal. p. 61. No. 615. Rather less than the preceding: nearly hemispherical: entirely of a deep glossy-black ; thickly and regularly punctured throughout: head rather large: thorax very convex, the lateral margins rounded and sometimes a little piceous : elytra gibbous, with a single impressed stria near the suture, not reaching to the base: body clothed beneath with a cinereous pubescence: legs deep pitchy- black: tarsi rufescent: tibiae sometimes paler. The trophi of this species approximate rather closely to those of Cercyon. Occasionally found in ponds in the metropolitan district, and in Norfolk.“ In Kensington-gardens, and on Wandsworth-com- mon.”—Mr. Ingpen. ‘ Glanville’s Wootton.” —J. C. Dale, Esq. “¢ Southend.”—Rev. F. W. Hope. Sp. 15. bipunciatus. Niger, thoracis lateribus pedibusque pallidis, elytris griseis creberrimé punctato-striatis, obscure nigro-pulverulentis. (Long. corp. 14— 14 lin.) Hy. bipunctatus. Fabricius.—Steph. Catal. p. 61. No. 616. Black, finely punctulated: head with a small pale spot on each side before the eyes: thorax with the lateral margins broadly pale-yellowish: scutellum black: elytra pale griseous, very convex, rather strongly punctate-striated, the strie composed of distinct fuscous impressions, and giving the appearance of being irrorated with dusky or black ; the margins paler: legs entirely pale. A very common species in the neighbourhood of London; in Norfolk, Suffolk, and I believe in most parts of the kingdom. HYDROPHILIDE.—HYDROBIUS. 133 “ Bottisham.”— Rev. L. Jenyns. “ Southend.”—Rev. F. W. Hope. | Sp. 16. striatulus. After, thoracis margine elytrisque substriatis griseis. (Long. corp. 14—1? lin.) Hy. striatulus. Fabricius.—Steph. Catal. p. 61. No. 617. Larger than the foregoing, the strie and punctures less profound, the elytra less - clouded with dusky, &c.; nevertheless it may be merely a variety: the head is black, with a very minute pale spot on each side: the palpi griseous: the thorax black, with a broad griseous margin: the elytra pale griseous, and very obscurely striated: the body obscure black: the legs pale griseous. Less common than the last, but found throughout the metropo- litan district. Sp. 17. Colon. Miger, thoracis lateribus pallidis, elytris tenué punctato-striatis, fusco-griseis, versis apicem maculis duabus albidis. (Long. corp. 14—1} lin.) Hy. Colon mihi. Steph. Catal. p. 61. No. 618. Allied to the two last, but of a darker colour, the lateral margins of the thorax narrowly pale, &c. Deep black, finely punctulated ; head with a very minute pale spot on each side ; thorax with a narrower pale-yellowish lateral margin : the disc glossy-black: elytra dusky or brownish-griseous, very finely punctate- striated, the disc more or less clouded with a deeper tinge, and near the suture towards the apex two round whitish spots: the lateral margins, and sometimes the base, pale: legs pale griseous. Sometimes found near London, but more abundant in the New Forest, Hants. ‘ Bottisham.”—Jtev. L. Jenyns. Sp. 18. bipustulatus. Niger, capite antice maculis duabus fulvis, elytris tes- taceis nigro pulverulentis, strid suturali unicé. (Long. corp. 11—1} lin.) Hy. bipustulatus. Marsham.—Steph. Catal. p. 61. No. 619. Glossy-black: head with two fulvous spots before the eyes: thorax testaceous, with three more or less confluent dusky spots on the disc, the lateral margins pale yellowish: elytra testaceous, obsoletely marked with interrupted black lines, each with a single impressed stria towards the suture: abdomen black: legs pale rufous. The clouded thorax and pale hue, added to the small size of the insect, dis- tinguish this from the following. Far from uncommon near London, especially during the early part of the year: also found in Norfolk. ‘Common in the spring, near Andover.”— Rev. G. T. Rudd. “ Bottisham.”— Rev. L. Jenyns. Sp. 19. minutus. Subovatus, piceus nitidus, elytrorum thoracisque lateribus pal- lidis, pedibus nigro-piceis. (Long. corp. 14—14 lin.) Hy. minutus. Marsham.—Steph. Catal. p. 61. No. 620. 134 MANDIBULATA.—COLEOPTERA. Closely allied to the foregoing, and different in form from Hydrop. globulus of Paykul hereafter described. Subovate, glossy pitchy-black, very faintly punctulated throughout: the margins of the thorax narrowly pale: elytra with a single stria on each towards the suture, the lateral margins pale testaceous: body beneath and legs pitchy-black. Very abundant, not only throughout the metropolitan district, but in other places ; in Norfolk, Suffolk, Devonshire, &c. “ Botti- sham.”—Rev. L. Jenyns. Sp. 20. ochraceus. Subovatus, niger, thoracis lateribus pallidis, elytris ochraceis immaculatis, strid suturali unicé. (Long. corp. 1—1} lin.) Hy. ochraceus mihi.—Steph. Catal. p. 61. No. 621. Allied to the last, but smaller, of a different colour and more deeply punctured : head immaculate black, finely punctured: thorax black, with the lateral margins pale yellowish, the disc finely punctulated: elytra very pale imma- culate ochraceous, rather deeply punctured throughout, with a deep sutural stria on each: body beneath and legs pale griseous. It is possible that this may be only an immature state of the foregoing, but the impressed dots seem larger and deeper. Taken near London, and in the New Forest, Hants. Sp. 21.lutescens. Subovatus, nigro-piceus, thoracis angulis anticis elytrorumque marginibus pallidé lutescentibus. (Long. corp. |—1]¥ lin.) Hy. lutescens mzhi.—Steph. Catal. p. 61. No. 622. Of a deeper colour, but of similar form to the preceding ; above glossy piceous ; the head black, immaculate: the thorax with the anterior angles alone pale lutescent: elytra obscurely punctured ; with a faint stria near the suture, the lateral margins lutescent: body beneath and legs piceous. Var. p. Hy. sordens. Steph. Catal. p. 61. No. 624. With the head black, the lateral margins of the thorax and elytra fulvous. Found near London, and in Suffolk; “ near Barham.”—Rev. W. Kirby. ! Sp. 22. foveolatus. Niger, thorace posticé foveolato, elytris strié unich im- pressd. (Long. corp. 3—1 lin.) Hy. foveolatus. Haworth.—Steph. Catal. p. 61. No. 623. Smaller than the foregoing: glossy black: head immaculate: thorax with the lateral margins pale, with several minute foveole on the disc, sometimes con- fluent: elytra pitchy-black, very finely punctulated, with a slight stria on each near the suture: legs dull ferruginous. Taken from April to June in ponds near London; ‘ on Hamp- stead-heath,” &c.—Mr. Ingpen. SPH ERIDIIDE. 135 Sp. 23. eneus. Ovalis, converus, eneus, punctatissimus, palpis tarsisque ferru- gineis. (Long. corp. 14 lin.) Hy. eneus. Steven. Steph. Catal. Appendiz. Rather narrower than the following, oval, convex, above densely and rather deeply punctured, of an obscure greenish-brass, rather glossy, beneath black : the femora piceous, the tibie and tarsi ferruginous; the palpi the same ; antenne piceous. Apparently rare. I have one specimen, found I believe near Ripley, in the summer of 1827 :—two specimens are also said to have been obtained from the New Forest. | Sp. 24. globulus. Converus, fusco-nigricans, subtilissime punctulatus, thoracts lateribus pallidis, elytris unistriatis. (Long. corp. 1—13 lin.) Hy. globulus. Paykul.—Steph. Catal. p. 61. No. 625. More convex than the foregoing ; of avery glossy black: head very finely punc- tulated, immaculate: thorax delicately punctured, very convex, the disc black, the lateral margins broadly pale griseous : elytra black, nearly gibbous, thickly and finely punctulated throughout, with a single striaon each near the suture, the lateral margins and apex sometimes piceous: legs brownish-red, or pitchy. Very distinct from the authentic Marshamian specimens of Hydrobius minutus, before described. Not uncommon near London, “ In ponds on Hampstead-heath, Wandsworth-common,” &c.—Mr. Ingpen. “ Bottisham.”—Rev. L. Jenyns. i Sp. 25. Seminulum. Niger nitidus, levis, elytris strié suturali unich, pedibus rufo-piceis. (Long. corp. ? lin.) Hy. Seminulum. Paykul.—Steph. Catal. p. 61. No. 626. The smallest insect of the genus; of a very glossy black, very gibbous: head convex, obtuse: thorax very convex, with the lateral and posterior margins rounded, smooth: elytra very convex, with a single stria on each near the suture, not touching the base; very smooth, with some obsolete impressions towards the apex, that are only visible with a powerful lens; the apex rather acute, and dull pitchy: body beneath pitchy-black: legs pitchy-red; tibie compressed, ciliated with spines. Rare: I possess specimens taken near London; and I believe the insect occurs also in Norfolk. Famity XV.—SPHAARIDIIDAL, Leach. Antenne scarcely as long as the thorax, nine-jointed, the basal joint very long, nearly straight, the four following small, the remainder forming a compressed perfoliated club. Mazillary palpi as long as the antenne ; the second joint —- > ES 136 MANDIBULATA.— COLEOPTERA. incrassated : head rounded anteriorly: body more or less hemispheric: thorar transverse: legs formed for walking: ¢ibi@ compressed, spinose, with spurs at the apex :—tarsi five-jointed, filiform, the basal and terminal joints elongated, the latter with two unequal claws. The passage from the last family to the present is doubtless most natural, and the habits of the insects are not widely dissimilar; the Hydrobii subsisting in a great measure upon decaying vegetable matter, and the Spheridiidze upon putrescent matter of a similar nature, that has previously passed through the bodies of animals. Again, many of the species of Cercyon are found only in damp places that are inundated in the winter, while others affect places of greater aridity. ‘Their larve are unknown. This family embraces two very distinct genera; which were divided by Dr. Leach; and may be known by the following succinet characters. solida: elytra striata: . . . . . . 105. CERCYON. antennarum clava ie : Dict 4 . laxé imbricata: elytra striis immunia: . 106. SpHaRIDIUM. Genus CV.—Cercyon, Leach. Mazillary palpi four-jointed, the basal joint minute, the following elongated, slender at the base and greatly incrassated at the apex, the third nearly as long, slender, the terminal much shorter, rather stouter, ovate, attenuated at the apex. Antenne very slender at the base, the four terminal joints forming an abrupt compact imbricated club: body very convex: thorax short, trans- verse: scutellum abbreviated: wings ample: elytra entire, striated, acute at the apex: legs moderate: tibce compressed, setose exteriorly ; tarsi short, the anterior simple in both sexes. The globose form and comparative minuteness of the insects of this genus well discriminate them from the Spheridia, from which they were separated by Dr. Leach: they are unquestionably very closely allied to the Hydrobii: their pabulum chiefly consists of horse-dung; and they are most abundant during the early summer months. ‘The species have been greatly neglected; but from a careful examination of the original Marshamian specimens, as well as of a vast number obtained by myself from various sources, I cannot but consider those recorded in the following pages as distinct, with the exception of such as are given with doubt*. The genus * I may here take occasion to remark, that the new species in this genus, as well as in most other instances, are rarely introduced upon the examination of SPH ARIDIIDE.—CERCYON. 137 is evidently capable of being subdivided, but I have not succeeded in detecting any satisfactory characters. Sp. 1. ruficorne. Migrum, depressiusculum, elytris apice pallidé rufis, mar- ginibus piceis, antennis palpisque rufo-ferrugineis. (Long. corp. 11—13 lin.) Sp. ruficorne. Kirby MSS.—Ce. ruficorne. Steph. Catal. p. 62. No. 627. Body somewhat depressed, above deep black, finely punctured, beneath rather obscure: palpi and antenne totally of a rusty-red: thorax immaculate, the margins a little dilated, and in some specimens obscurely piceous ; elytra rather faintly punctate-striated ; black, with the lateral margins piceous, the apex pale rufous, or testaceous: legs pitchy-black ; tarsi sometimes rufescent. This and the four following species differ from the rest of the genus by having the sides of the thorax more or less dilated, and the body somewhat de- pressed. Occasionally taken in damp places near London. “On the banks of the Orwell, near Barham.”— Rev. W. Kirby. Sp. 2. littorale. Migro-piceum, depressiusculum, elytris apice pallidis, basi ad scutellam puncto rufo. (Long. corp. 11—14 lin.) Sp: littorale. Gyllenhal.—Ce. littorale. Steph. Catal. p. 62. No. 628. Body rather depressed, above pitchy-black, most minutely punctured, beneath obscure black: palpi and antenne pitchy-red, the club of the latter dusky : thorax pitchy, with the lateral margins paler, and slightly dilated: elytra finely striated, the strie punctate, with the apex pale, the margins rufescent, and an obscure red spot at the base near the scutellum: legs castaneous. Found occasionally near London in damp places. ‘ Beneath Zostera marina in the river Orwell, near Ipswich.” — Marsham MSS. Sp. 3. binotatum. Migrum depressiusculum, elytris lurido-testaceis, maculis duabus exustis ad suturam versus apicem. (Long. corp. 1}—14 lin.) C. binotatum. Steph. Catal. p. 62. No. 629. single specimens, but upon the collation of extensive ‘series of varieties, each specimen retaining its own peculiar, though minute, characteristic difference ; and that I possess many other specimens of such minute insects which I have not ventured to give as distinct species. I may here also reiterate the observa- tion at the foot of page 126 of my first volume, not only so far as regards species, but genera: as amongst numerous other novelties which have recently been communicated to me may be enumerated Masoreus luxatus! Nothiophili 4- punctatus et fulvipes, an extraordinary Geodephagous genus allied to the Scaritide? which I propose to call Spheroderus:—another more remarkable one allied to Macronychus, and apparently connecting that genus with Ochthe- bius ; several new Hydropori and Colymbetes, &c.: all of which 1 shall in due time describe. 138 MANDIBULATA.—COLEOPTERA. Body somewhat depressed ; above pitchy-black or deep black; thorax with the margins rather paler or castaneous; elytra of a lurid testaceous, with two brown subquadrate spots varying in magnitude near the suture towards the apex ; legs pitchy-red, with the femora dusky; palpi dusky. Var. 6. With a slight brown cloud at the base of the elytra near the suture; the suture itself rather dusky. It is probable that this is merely an immature state of the foregoing. Taken near Barham in Suffolk by myself, in September 1821.— «‘ South Creak, Norfolk.”-—Rev. T’. Skrimshire. Sp. 4. dilatatum. Migro-piceum, depressiusculum, capite atro, thorace ely- trisque lurido-testaceis. (Long. corp. 14 lin.) Ce. dilatatum. Steph. Catal. p. 62. No. 630. Rather depressed: of a pitchy-black; with the head eee immaculate: thorax with the margins dilated, very glossy-smooth livid testaceous ; elytra rather faintly punctate-striated, immaculate livid-testaceous ; legs testaceous- red, with the base of the femora dusky: palpi pitchy-red. Whether this be also an immaculate state of Ce. littorale time alone can de- termine. Found with the foregoing insects. Sp. 5. depressum. Nigro-piceum, depressum, thoracis lateribus elytrisque cas= taneo-piceis, his apice pallidioribus. (Long. corp. 1—1+ lin.) Ce. depressum. Steph. Catal. p. 62. No. 631. Greatly depressed ; pitchy-black, finely punctured throughout: head immacu- late: thorax very glossy, with the disc pitchy-black, the margins castaneous and dilated: elytra rather faintly punctate-striated, the strie vanishing on the margins, which are of a pitchy-chestnut; and the apex pale testaceous : legs pitchy-black: antenne and palpi rufescent, the club of the former dusky. Taken near Brockenhurst in the New Forest. ‘* Southend, in damp places.”— Rev. F. W. Hope. Sp. 6. aquaticum. Aterrimum, convexum, nitidissimum, elytris obsoletissimé striatis, apice tibtisque ferrugineis. (Long. corp. $—2 lin.) Sp. aquaticum. Kirby MSS.—Ce. aquaticum. Steph. Catal. p. 62. No. 632. — Convex; very deep glossy-black: head and thorax very smooth, shining, im« maculate, black: elytra very obsoletely punctate-striated, the apex very ob- scure ferruginous: legs pitchy-black, with the tibie ferruginous: palpi and antenne rufescent, the club of the latter dusky. Var. &. With the legs entirely pitchy-red. Sometimes taken near London. ‘“ Found in water, never in dung.” —Rev. W. Kirby. Sp. 7. flavipes. Converum, atrum, elytris substriatis, apice PREC pedi« bus rufis. (Long. corp. 3—1 lin.) SPHERIDIIDZ.—CERCYON. 139 Sp. flavipes. Fabricius ?—Ce. flavipes. Steph. Catal. p. 62. No. 633. Convex, deep glossy-black, very minutely punctulated above: head and thorax immaculate: elytra rather faintly striated, the lateral margin slightly ru- fescent, the apex yellowish: legs castaneous-red: antenne and palpi rufous. The deep extended yellow apex of the elytra discriminates this from the pre- ceding species. This species was first observed in Norfolk by Professor Hooker ; it has however since occurred in Suffolk, and near London not uncommonly. Sp. 8. terminatum. Migrum, subconverum, glaberrimum, elytris striatis ad apicem ferrugineis, pedibus piceo-ferrugineis. (Long. corp. 1—1+ lin.) De. terminatus. Marsham.—Ce. terminatum. Steph. Catal. p. 62. No. 634. Less convex than the preceding: body black, very glossy: elytra black, striated, the strie beautifully and thickly punctated; with a large pale ferruginous spot at the apex, extending laterally nearly to the base: antenne and legs pitchy-red. The less convex form, and broad lateral ferrugimous patch at the apex of the elytra, distinguish this from the foregoing insects. Where the Marshamian specimen was taken I am not aware; I have however found specimens near London. Sp. 9. acutum. Convexum, postice acutum, atrum, nitidissimum, elytris sube striatis, pedibus piceo-castaneis. (Long. corp. $—? lin.) Sp.acutum. Kirby MSS.—Ce. acutum. Steph. Catal. p. 62. No. 635. Convex, rather acute posteriorly, very deep glossy-black: head and thorax im- maculate: elytra very faintly striated, the apex generally concolorous: legs pitchy-chestnut ; antenne and palpi the same. Var.8. Steph. Catal. 1. c—More glossy and of a more intense black. Var. y. Steph. Catal. 1. c.—With a minute rufescent spot at the apex of the elytra, and the club of the antenne dusky. The attenuated posterior extremity discriminates this species from the foregoing. Var. y. may be distinct. Found in Suffolk and near London; sometimes occurring in Agarics and Boleti. Sp. 10. Calthe. Subconverum, atrum, nitidum, elytris striatis apice obsolete ferrugineis, pedibus piceis. (Long. corp. 1 lin.) De. Calthe. Scopoli?—Ce. Calthe. Steph. Catal. p. 62. No. 636. Less convex than the last; very deep glossy-black: head and thorax immaculate, faintly punctured ; elytra distinctly punctate-striated, the interstices finely punctured ; the apex obsoletely ferruginous: legs, antenne, and palpi pitchy- red. The inferior convexity and obtuseness of the body, and minute apical spot of the elytra, and superior bulk, distinguish this insect from Ce. acutum. 140 MANDIBULATA.—COLEOPTERA. Taken in marshy districts near London, frequenting the flowers of Caltha palustris. Sp. 11. bolitophagum. Valde converum, nigrum, antennis pedibusque rufo= piceis, elytris striatis, apice fuscis, interstitiis striarum punctulatis. (Long. corp. 1 lin.) ! De. bolitophagus. Marsham.—Ce. bolitophagum. Steph. Catal. p. 62. No. 637. More convex and smooth than the last: of a very glossy, deep, immaculate black : the elytra very faintly and delicately striated: the interstices finely punctured, dusky, with the apex fuscous: the antenne and legs rufo-piceous. The glossiness and convexity of the body, and faintly striated elytra, form the chief difference between this and the foregoing species. : Not common: found near London; occasionally in Boleti. Sp. 12. immune. Convexum, atrum-nitidum, elytris obsoletissimé striatis, an-= tennis pedibusque testaceo-ferrugineis. (Long. corp. ?—1 lin.) Sp.immune. Kirby MSS.—Ce. immune. Steph. Catal. p. 62. No. 638. Convex, shining black; head and thorax immaculate: elytra very obsoletely striated, the strie composed of minute impressions; the interstices smooth, the apex slightly piceous: antenne and legs rusty-testaceous. The very faint and nearly obsolete strie on the elytra, and the nearly immaculate apex of the latter, are the principal characters of discrimination between this species and all the foregoing. It has been called in some cabinets by the name of Spheridium leve. Found in Norfolk and Suffolk, and occasionally near London. Sp. 13. levigatum. Valdé converum, nigrum, antennis pedibusque rufo-piceis, elytris striatis, interstitits striarum impunctatis. (Long. corp. 1—1 lin.) - Sp. levigatum. Kirby MSS.—Ce. levigatum. Steph. Catal. p. 62. No. 629. Glossy black, very convex, head and thorax immaculate; elytra rather faintly striated, the interstices impunctate, black, with the apex rather obscurely pale or pitchy: antenne and legs pitchy-red: palpi and club of the antenne dusky. The smooth interstices between the strie on the elytra, and the superior bulk of the insect, distinguish it from Ce. bolitophagum, which it most resembles. Also found in Norfolk and Suffolk, and sometimes near London; at Hertford and Ripley. Sp. 14. apicale. Ovatum, atrum-nitidum, concinné punctatum, elytris tenué punc- tato-striatis, atro-piceis, apice castaneo. (Long. corp. 3—1 lin.) Ce. apicale. Steph. Catal. p. 62. No. 640. Ovate: head and thorax glossy pitchy-black, immaculate, the entire surface beautifully and thickly punctured ; elytra deep piceous, with the apex casta- SPH ERIDIIDE.—CERCYON. 141 neous, the dise thickly punctured, and rather faintly punctate-striated : femora black: tibia and tarsi castaneous-red: palpi pitchy. Differs from Ce. levigatum by its punctured surface, castaneous apex to the elytra, coloured tibie, and tarsi, and dissimilar form. Found near London. Sp. 15. obsoletum. Rotundato-ovatum, nigrum, piceum. convecum, elytris tenué punctato-striatis, apice pedibusque rufescentibus. (Long. corp. 1S—1# lin.) Sp. obsoletum. Gyllenhal.—Ce. obsoletum. Steph. Catal. p. 62. No. 641. Rounded-ovate, slightly depressed, deep black; above finely punctured through- out, head and thorax immaculate: elytra very faintly punctate-striate, the interstices flat, thickly punctulate, black ; the apex and posterior margins inde- terminately and obscurely rufo-piceous: body black: legs rufescent, the fe- mora piceous: palpi pitchy-black, with the joints paler: antenne rusty-pitchy, with the capitulum dusky. The largest species of the genus: differs from all the foregoing by being less glossy, and from Ce. piceum by its size, the less punctate strie on the elytra, and the coloured apex of the latter, &c. Not very common: taken occasionally on Hampstead heath ; at Hertford and Ripley. ‘ Bottisham.”—Rev. L. Jenyns. “ Net- _ley.”—Rev. F. W. Hope. Sp. 16. piceum. Ovatum, nigrum, glaberrimum, elytris pedibusque — piceis. (Long. corp. 11—12 lin.) De. piceus. Marsham.—Ce. piceum. Steph. Catal. p. 63. No. 642. Ovate, head and thorax of a pitchy-black, immaculate, very smooth and glossy : elytra entirely piceous, with the apex rather paler; the entire surface mi- nutely punctulated, and the disc very obsoletely striated: the legs also en- tirely piceous. Distinguished by its ovate form, and nearly uniform piceous elytra. In size and tinge of colour this species varies considerably. Very abundant during May and June near London: also found in Norfolk, Suffolk, and Cambridgeshire. Sp. 17. picinum. Subovatum, atrum, glaberrimum, nitidum, abdomine subtus nigro-testaceum, elytris pedibusque piceis. (Long. corp. 13 lin.) De. picinus. Marsham.—Ce. picinum. Steph. Catal. p. 63. No. 643. Subovate, very smooth, glossy ; antenne, head, and thorax immaculate black: elytra piceous throughout, the apex concolorous, striated, the strie composed of impressed dots: abdomen beneath testaceous-black: legs piceous. The somewhat greater bulk, uniformly coloured and pale elytra and testaceous- black abdomen distinguish this species from the foregoing. Taken near London; and in Suffolk, not uncommonly. Sp. 18. simile. Subovatum, atrum, glabrum, elytris totis, pedibusque rufo- castaneis. (Long. corp. 1—1+ lin.) 142 MANDIBULATA.—COLEOPTERA. De similis. Marsham.—Ce. simile. Steph. Catal. p. 63. No. 644. Less than the last ; subovate: head and thorax glossy pitchy-black, with the margins rather paler: elytra castaneous-red, rather deeply punctate-striated, the interstices slightly convex and impunctate: abdomen and legs pale cas- taneous-red. The plain immaculate rufescent elytra, and pale legs, distinguish this from the foregoing: of which the specimens examined may possibly prove to be immature examples. Also found near London; not common. Sp. 19. suturale. Subovatum, atrum nitidum, elytris rufo-castaneis sutura nigra, pedibus rufescentibus. (Long. corp. 14—14 lin.) Ce. suturale. Steph. Catal. p. 63. No. 645. : | Subovate, glossy: head and thorax immaculate black, minutely punctured: elytra rather faintly punctured, and slightly punctate-striated, the interstices slightly convex ; the disc bright rufo-castaneous ; the suture deep black. nearly to the apex: abdomen deep glossy-black ; legs rufescent, with a dusky cloud in the middle of the femora. The castaneous elytra with a jet-black suture distinguishes this from the fore- going, exclusively of other differences. Inhabits the neighbourhood of London; and I have obtained specimens from Norfolk. Sp. 20. laterale. Subovatum, piceum, glaberrimum nitidum, thoracis latertbus pallidioribus, elytris obsoleté striatis. (Long. corp. 1+ lin.) De. lateralis. Marsham.—Ce. laterale. Steph. Catal. p. 63. No. 646. Subovate: very smooth, glossy-piceous, except the sides of the thorax, which are paler, and the apex of the elytra, which is slightly rufescent : the entire surface is thickly and rather deeply punctured throughout, and the elytra are rather obsoletely punctate-striated: abdomen black: legs pitchy-red. From Ce. suturale this differs by the distinctly coloured lateral margins of the thorax, and from Ce. simile by the colour of the elytra and sculpture. Found abundantly near London in May. “ Bottisham.”—Rev. L. Jenyns. “ Netley and Southend.”—Rev. F. W. Hope. Sp. 21. hemorrhoidale. Converum, nigrum nitidum, elytris apice castaneo-rufis, antennis pedibusque nigris. (Long. corp.'14 lin.) . Sp. hemorrhoidale. Fabricius——Ce. hemorrhoidale. Steph. Catal. p. 63. No. 647. Rather larger than the foregoing: subovate ; of a deep glossy-black, finely punc- tured ; head and thorax immaculate: elytra with the apex alone castaneous- red, the rest black ; rather faintly punctate-striated ; the abdomen, antenne, and legs black. The black antenne and legs, combined with the bright castaneous-red apex of the SPH ERIDIIDE.—CERCYON. 143 . elytra, distinguish this species from the preceding, and its less convex form from the following, which it somewhat resembles in colour. Found near London and in Suffolk. Sp. 22. femorale. Valdé convexum, atrum nitidum, elytris lateribus castaneo- rufis, pedibus rufis, femoribus nigris. (Long. corp. 1+ lin.) Sp. femorale. Kirby MSS.—Ce. femorale. Steph. Catal. p. 63. No. 648. Allied to the last, but more convex: very deep shining black: head and thorax immaculate, finely punctured: elytra also finely punctured, deep pitchy-black, with the lateral margins rufo-castaneous ; the disc punctate-striated : femora black ; tibia and tarsi rufous. Known by the rufous lateral margin to the elytra, black femora, and convexity. Also found near London and in Suffolk. Sp. 23. hemorrhoum. Vald? convexum, ovatum, nigrum nitidum, elytris striatis apice determinate rufis, pedibus piceis, tibiis tarsisque dilutioribus. (Long. corp. 14 lin.) Sp. hemorrhoum. Gyllenhal.—Ce. hemorrhoum. Steph. Catal. p. 63. No. 649. Somewhat larger than the last; very convex, and obtuse: deep glossy black: head and thorax thickly punctured, the latter especially, and very gibbous: elytra distinctly striated, the strie punctated, the interstices finely but obsoletely punctulated ; the apex with a distinct large pale rufous patch, with the suture black: beneath black: legs pitchy-black, with the tibie and. tarsi - paler. A very. common species throughout the metropolitan district; in Norfolk, Suffolk, Devonshire, &c. “ Bottisham.”—Rev. L. Jenyns. ‘* Netley and Southend.”—Rev. F. W. Hope. Sp. 24. xanthorheeum. Valdé converum, ovatum, atrum nitidum, elytris striatis, apice rufo, pedibus nigris, tarsis rufis. (Long. corp. 14 lin.) Ce. xanthorheum. Leach MSS.—WSteph. Catal. p. 63. No. 650. Rather less and of a deeper colour than the last: very convex, ovate, deep jet- black, shining: head and thorax thickly punctured, immaculate: elytra deep black, slightly striated, the interstices punctured, the apex rufous: femora and tibie pitchy-black: tarsi rufous. Probably a variety of the foregoing. Inhabits the same places as the preceding. Sp. 25. xanthocephalum. Valdé convexrum, ovatum, atrum nitidum, elytrorum apice capiteque piceo-rufis. (Long. corp. 14 lin.) Sp. xanthocephalum. Kirby ? MSS.—Ce. xanthocephalum .Steph. Catal. p. 63. No. 651. Size of the last, and resembling it in form, but differing in the colour of its head : of a deep shining black, finely punctured on the head and thorax, the former of a pitchy-red ; the latter immaculate: elytra finely striated, the interstices 144 MANDIBULATA.—COLEOPTERA. faintly punctured; the apex pitchy-red: legs pitchy-black, with the tibie and tarsi paler. Found occasionally in Norfolk and Suffolk, and near London. Sp. 26. infuscatum. Converwm, atrum, opacum, thorace gibbose pulvinato, elytris piceo-nigris, apice paulo dilutiort. (Long. corp. ? lin.) Ce. infuscatum. Steph. Catal. p. 63. No. 652. Similar in form to the three last, but much smaller: of a deep obscure black ; head and thorax immaculate, thickly punctulated, the thorax very gibbous: elytra very obsoletely striated, the interstices scarcely punctured and rather flat; deep opaque pitchy-black, with the apex rather paler: legs entirely of a castaneous-red. This and the three last are of a more convex form than the rest of the genus: they may be readily known from each other by the characters above given. Not common: found near London. Sp. 27. impressum. Ovatum, atrum nitidum, capite thorace maculdque triangulart ad scutellum nigris, elytris pedibusque rufo castaneis. (Long. corp. 14— 13. lin.) : Sp. impressum. Stwrm.—Ce. impressum. Steph. Catal. p. 63. No. 653. Larger than the following: ovate, glossy: head and thorax deep black, im- maculate; elytra deep rufo-castaneous, with a large triangular black patch at the scutellum: the disc punctate-striated, the strie rather deep, the in- terstices thickly punctate; legs also bright rufo-castaneous: antenne pale testaceous ; palpi dusky. Considerably larger than the following species, and without the lateral black streak at the base of the elytra, as in that and Ce. conspurcatum. Also somewhat rare: taken near London, and in Hampshire. Sp. 28. melanocephalum. Oblongo ovatum, nigrum, elytris rufo-testaceis, macula baseos communi triangulari alterdque laterali nigris. (Long. corp. 3—1 lin.) . De. melanocephalus. Linné.—Ce. melanocephalus. Steph. Catal. p. 63. No. 654. Oblong-ovate, shining: head and thorax deep immaculate black, punctured: elytra rufo-testaceous, with a large triangular common black spot at the base, and another smaller one at the outer anterior angle; the surface finely and thickly punctured, and rather faintly punctate-striated: legs rufo-testaceous: antenne and palpi dusky-black. Var. 6. Steph. Catal. |. c.—With the femora deep black. The smaller size, more elongate form, dark antenne and palpi, and black patch at the lateral angle of the elytra, sufficiently distinguish this from the fore- going ; and the former characters discriminate it from the following. Found copiously from April to June in meadows and pastures, throughout the metropolitan district. be SPHAZRIDIIDE.—CERCYON. 145 Sp. 29. conspureatum. Oblongo-ovatum, nitidum nigrum, elytris pallid? rufo- testaceis, elytris maculé baseos communi triangulari humerisque nigris, an- tennis pedibusque pallidé testaceis. (Long. corp. 4—? lin.) Sp. conspurcatum. Stwrm.—Ce. conspurcatum. Steph. Catal. p. 63. No. 655. Oblong-ovate, shining: head and thorax black, immaculate: elytra pale rufo- testaceous, finely punctured, and rather delicately punctate-striated, the base with a large common triangular black spot, and the lateral margin with an elongate black streak: legs pale rufo-castaneous ; antenne the same; palpi dusky, sometimes pale-testaceous. This minute species varies considerably in size: it differs from the last in its smaller size, paler antenne and legs, and the dissimilarly formed streak at the base of the elytra. Apparently very abundant near Lyndhurst in the New Forest, but less so near London. Sp. 30. atomarium. Ovatum, nigrum, obscurum, punctatissimum, elytris pro- funde crenato-striatis, apice pedibusque ferrugineis. (Long: corp. 3—# lin.) Sp. atomarium. Fabricius——Ce. atomarium. Steph. Catal. p. 63. No. 656. Small: ovate, black, obscure, thickly punctured: palpi and antenne piceous: head and thorax immaculate: elytra broad, dilated at the sides, slightly de- pressed, striated, the strie very deeply crenate-punctate, the interstices ele- vated, thickly punctulated, black, obscure, the apex more or less rufescent: legs rusty-red ; the femora sometimes piceous. The deeply crenate striz on the elytra of this species discriminate it from all the other species. It varies greatly in size. Extremely common in the neighbourhood of London. Sp. 31. sordidum. Ovatum, obscuro-piceum, capite nigro, elytris rufo-piceis, punctato-striatis, pedibus picets. (Long. corp. 1 lin.) De. sordidus. Marsham.—Ce. sordidum. Steph. Catal. p. 63. No. 657. Ovate: head black: thorax pitchy-black, punctulated: elytra pitchy-red, punc- tate-striated, the interstices finely punctured: breast black, punctulated ; ab- domen beneath rufo-ferrugineous, or piceous: legs piceous: antenne black, rufous atthe base. Allied to the last in form, but the strie less impressed, the colour different, &c. The Marshamian specimens alone are the only ones that I have hitherto examined; I am ignorant of their locality. Sp. 32. convexium. ee ee atrum, obscurum, antennis pedibusque piceo-castaneis. (Long. corp. $—£ lin.) Sp- convexium. Kirby MSS.—Ce. convexium. Steph. Catal. p. 64. No. 658. Rounded-ovate, deep obscure black: head and thorax thickly punctured, im- maculate: elytra opaque black, the apex slightly margined with piceous ; Manpisutata. Vou. II. lst Fepruary, 1829. 1 146 MANDIBULATA.—COLEOPTERA. faintly punctate-striated, the interstices impunctate: legs and antenne pitchy- chestnut: palpi dusky. Broader and of a deeper colour than the next species, which greatly resembles it:—they are both somewhat similar in form to Ce. hemorrhceum and its affinities, but considerably smaller. I obtained a single example of this insect from Mr. Marsham’s collection; and have since procured others that were taken near London. Sp. 33. convexior. Oblongo-ovatum, atrum, nitidum, elytris apice tarsisque rufo-castaneis. (Long. corp. 4—é lin.) De. convexior. Marsham MSS.—Ce. convexior. Steph. Catal. p. 64: No. 659. Oblong-ovate ; deep glossy-black: head and thorax immaculate, finely and thickly punctured: elytra rather deeply punctate-striated, the interstices a little elevated and punctulated; deep shining black, with the apex distinctly bright castaneous: femora and tibie dusky piceous, the latter palest, or some- times rufescent ; tarsi light castaneous-red: antenne and palpi rufous. Not so broad as the last, more glossy, the elytra more deeply-striated, and the interstices punctured. I also obtained this species from the Marshamian cabinet; and have since procured other specimens captured near London. Sp. 34. convexiusculum. Oblongo-ovatum, subconverum, atrum, nitidum, elytris tenuc punctato-striatis apice obscuré piceo. (Long. corp. ? lin.) De. convexiusculum. Marsh. MSS.—Ce. convexiusculum. Steph. Catal. p. 64. iNo. 660. Oblong-ovate, slightly convex, deep shining black ; head and thorax immaculate, punctulated: elytra rather depressed, faintly punctate-striated, the interstices nearly flat, obsoletely punctured ; deep pitchy-black, the apex obscurely piceous: legs dull castaneous-red, the femora rather dusky : club of the an- tenne and palpi black. Somewhat less than the last, the elytra more depressed, faintly striated, the in- terstices nearly flat, scarcely punctulated, and palpi black. From the Marshamian cabinet: it occurs near London. Sp. 35.nigrinum. Subconverum, obscuré subeneum, elytris obsoletissimé striatis, interstitiis obsoleté punctatis pedibusque nigris. (Long. corp. ¢ lin.) | De. nigrinus *. Mus. Marsham.—Ce. nigrinum. Steph. Catal. p. 64. io. 661. * This insect is not the Dermestes nigrinus of Entomologica Britannica, which has been erroneously given as a synonym for Hydrobius Seminulum: the De. nigrinus of Marsham, of which I possess the original specimens, being Lim- nebius nigrinus of my Catalogue; the species described as De. nigricans, in p- 121, by a typographical error. SPH ZRIDIIDEH.— CERCYON. 147 Subconvex, obscure dull neous, the elytra very obsoletely striated: the inter. stices obsoletely punctulated, the apex concolorus: antenne and legs dul! black. The obscure brassy hue of the upper surface of this species, and the obsoleteness of the strie on the elytra, with the black legs and antenne, well distinguish it from the rest of the genus. I have but one example of this species, which I procured from the Marshamian cabinet by the above name; not as the De. ni- grinus of Entomologica Britannica, which was also in the col- lection. Sp. 36. immaculatum. Ovatum, converum, piceum, nitidum, elytris piceo-nigris immaculatis, obsoletissims striatis, pedibus piceis. (Long. corp. ? lin.) Sp. immaculatum. Kirby MSS.—Ce. immaculatum. Steph. Catal. p. 64. No. 662. | ; Ovate, convex ; glossy pitchy-black ; head black: thorax piceous, thickly punc- tulated: elytra of an immaculate pitchy-black, very obsoletely striated, the interstices scarcely punctulated ; legs piceous: antenne and palpi rufescent. ) This minute species is distinguished by having the apex of the elytra concolorous, and the elytra scarcely striated or punctured. Found near London and in Suffolk. Sp: 37. stercorator. Oblongo-ovatum, atrum, nitidum, elytris obsoleté striatis, interstitiis creberrimeé punctulatis, apice piceis. (Long. corp. 2,—4 lin.) Sp. stercorator. Kirby M. SS.—Ce. stercorator. Steph. Catal. p. 64. No. 663. Minute: oblong-ovate ; deep glossy-black ; head and thorax immaculate: elytra very obsoletely striated, the interstices thickly punctulated, the apex piceous: femora pitchy-black: tibie and tarsi rufescent; antenne with the club, and the palpi, dusky. Less than C. minutum, which it greatly resembles, but differs in having the apex of the elytra pitchy, and slightly in form:—from Ce. merdarium it differs in having the tibie and tarsi rufescent. Found near London and in Suffolk. Sp. 38. merdarium. Oblongo-ovatum, aterrimum, subnitidum, elytris obsolet: striatis, apice rufescente. (Long. corp. } lin.) Sp. merdarium. Sturm ?—Ce. merdarium. Steph. Catal. p. 64. No. 664. Oblong-ovate, rather shining: head and thorax deep black, immaculate ; elytra rather faintly striated, the interstices. obscurely punctured; deep black, the apex pale rufescent ; legs, antenne, and palpi entirely of a deep black. The nearly jet-black hue of this minute species, which has merely the apex of the elytra coloured, sufficiently points out its distinction from its congeners: it is probably the Sph. merdarium of Sturm, but his figure is without the "sete on the tibie, which, if correct, would seem to indicate a generic dif- ference. Lie 148 MANDIBULATA.—CCLEOPTERA. Inhabits the metropolitan district, not common. Sp. 39. pygmeum. Ovatum, nigrum, elytris obsolete striatis, castaneis bast saturatioribus, femoribus piceis, tibiis tarsisque nigris. (Long. corp. 3 lin.) Sp. pygmeum. Illiger.—Ce. pygmeum. Steph. Catal. p. 64. No. 665. Minute: ovate; black, shining: head and thorax immaculate, punctulated : elytra thickly punctured; rather obsoletely striated, deep castaneous, with the base darker: the femora pitchy; the tibie and tarsi rufous. The pitchy femora, and more deeply coloured elytra, distinguish this from Ce erythreopum ; which may however be only an immature state of the present insect. Var from uncommon in the neighbourhood of London: also . found in Norfolk. Sp. 40. erythropum. Ovatum, nigrum, elytris obsolete striatis, piceo-castaneis apice rufo, pedibus omnind rufis. (Long. corp. 3 lin.) Sp. erythropum. Airhy MSS.—Ce. erythropum. Steph. Catal. p. 64. No. 666. Closely allied to the last; very minute: ovate, black; head and thorax pitchy- black, immaculate, finely punctured: elytra pitchy-chestnut, with the apex rufous; the surface finely punctured and faintly striated; the legs entirely rufous. The totally rufous legs and paler colour serve to distinguish this from the foregoing. Taken in Norfolk, Suffolk, and near London. Sp. 41. lugubre. Ovatum, nigrum, elytris punctato-striatis, interstitiis sub- levibus, apice pedibusque rufo-piceis. (Long. corp. .3,—4 lin.) Sp. lugubre. Fabricius.—Ce. lugubre. Steph. Catal. p. 64. No. 66. Very minute: ovate, black ; head immaculate: thorax with the lateral margins obsoletely piceous: elytra shining pitchy-black, the apex more or less ru- fescent 3 convex, punctate-striated, the interstices nearly smooth: legs, palpi, and antenne dull pitchy-red. Closely allied to the foregoing, but smaller, and differs in having the legs of a darker hue, and the punctures on the elytra fainter, with the striae more distinct. It must not be confounded with the Dermestes lugubris of Marsham, which is many times larger. ; Inhabits the same counties as the last. Sp. 42. minutum. Ovatum, nigrum, elytris tenué punctato-striatis, ae levibus piceis, interstitiis sublevibus, pedibus concoloribus. (Long. corp. 3—? lin.) Sp. minutum. Fabricius.—Ce. minutum. Steph. Catal. p. 64. No. 668. - Ovate, black; head and thorax immaculate: elytra faintly punctate-striated, the apex smooth and pitchy, the interstices nearly smooth: sol pitchy or deep black ; sometimes rufescent. Rather larger than the last, and the legs generally concolorous with the body :— SPH ERIDIIDH.—CERCYON. 149 the specimens with paler legs generally having the prevalent colour pitchy- black or somewhat castaneous, and are probably immature. Common throughout the metropolitan district. Sp. 43. obscurum. Ovatum, obscuro-piceum, margine thoracis elytrorumque apicibus rufis, pedibus piceis. (Long. corp. {5 lin.) De. obscurus. Marsham.—Ce. obscurum. Steph. Catal. p. 64. No. 669. Ovate; dull piceous, glossy: head pitchy: thorax piceous, the margin ru- fous; elytra rather flat, very obsoletely striated, piceous, with the apex rufous: legs piceous: palpi dusky: antenne pale rufous, with the club of a deeper hue. The rufescent margin of the thorax, bright rufous apex to the elytra, which are most obscurely striated, and dull-pitchy colour, distinguish this species. Its habit is very dissimilar to that of the rest of the genus. From the Marshamian collection. Sp. 44. contaminatum. Ovatum, converum, piceo-nigrum, elytris obsoletissime striatis castaneis, apice pallidiore. (Long. corp. +5 lin.) Sp. contaminatum. Kirby MSS.—Ce. contaminatum. Steph. Catal. p. 64. No. 670. Ovate, very convex, slightly attenuated behind: head pitchy-black, immaculate : thorax rather glossy, pitchy-black, with the lateral margins obscurely rufous anteriorly: elytra very obsoletely striated, the interstices impunctate, deep pitchy chestnut, with the apex slightly paler: legs, antennae, and palpi rufo- castaneous. The ovate, slightly attenuated posterior extremity of this minute convex species, with its deep pitchy colour, and castaneous obscurely striated elytra, dis- criminate this insect from its congeners. Taken near London, and in Suffolk: also I believe in Norfolk. Sp. 45. concinnum. Ovatum, atrum, nitidum, thoracis margine elytrisque piceo-testaceis, pedibus rufis. (Long. corp. 3—? lin.) De. concinnus.. Marsham.—Ce. concinnum. Steph. Catal. p. 64. No. 671. Ovate, shining: head black, immaculate: thorax black, with its anterior and lateral margins testaceous: elytra deep pitchy-testaceous, rather faintly punc- tate-striated ; the interstices impunctate : legs rufous: antenne and palpi the same. Closely allied to the last, but rather larger; the black head, coloured margins of the thorax and pitchy-testaceous elytra, however, sufficiently distinguish it therefrom. Occasionally found near London; in Norfolk and Suffolk. Sp. 46. ferrugineum. Ovatum, nitidum, saturate rufo-ferrugineum, immacu- latum. (Long. corp. ?—1 lin.) De. ferrugineus. Marsham.—Ce. ferrugineum. Steph. Catal. p. 64. No. 672. 5 5 ii P 150 MANDIBULATA.—COLEOPTERA. Larger than the preceding: ovate; glossy, entirely of a deep rusty-red: elytra punctate-striated, immaculate: legs, antenne, and palpi paler testaceous-red. Known by its ovate form, deep immaculate ferruginous colour, and rather greater bulk, from the preceding species. One of my specimens was contained in the Marshamian cabinet, the others were taken near London. Sp. 47. stercorarium. Ovatum, converum, atrum, nitidum, antennis pedibusque rufis. (Long. corp. 3—? lin.) i De. stercorarium. Marsham.—Ce. stercorarium. Steph. Catal. p. 64. No. 673. Ovate, very convex, deep glossy-black: head and thorax immaculate: elytra gibbous, faintly punctate-striated, the! interstices punctate, deep black, with the apex concolorous: legs, antenne, and palpi rufous. This differs from the three last-mentioned insects, by its smaller size, more elongate form, and deep-coloured elytra. Not uncommon near London: also found in Norfolk, Suffolk, Devonshire, &c. 7 Sp. 48. fuscescens. Oblongo-ovatum, subdepressum, piceo-nigrum, nitidiusculum, elytris fuscescentibus, tenué punctato-striatis, pedibus pallidis. (Long. corp. 4 lin.) | Ce. fuscescens miht.— Steph. Catal. p. 64. No. 674. Obong-ovate, slightly depressed, and shining: head black: thorax pitchy-black, the margin broadly testaceous: elytra somewhat fuscescent, the outer margin rather piceous, the apex pallid, faintly striate, the stria punctate: the inter- stices impunctate: antenne, palpi, and legs pale. The oblong depressed form and pallid hue of this insect are the chief characters which distinguish this from the other minute dark-coloured species. . I found this insect near Londen several years since. Sp. 49. immundum. Ovatum, convexum, latum, nitidum, castaneo-brunneum, thoracis marginibus pallidioribus, elytris striatis, interstitiis obsoletissime transversim strigosis. (Long. corp. 3—3 lin.) Sp. immundum. Stwrm.—Ce. immundum. Steph. Catal. p. 64. No. 675. Ovate, convex, broad, glossy chestnut-brown ; with the margins of the thorax pale: elytra rather paler, immaculate, faintly striated, the interstices under a powerful glass appearing very obsoletely striated transversely: antenne, legs, and palpi pale rufo-castaneous. ‘The transverse strie on the elytra, which can only be observed by a powerful lens, sufficiently characterize this species. The only indigenous example I have hitherto seen was in the Th em ie =e e e e Marshamian collection unnamed. Its locality is unknown to me. SPH ZRIDIIDH.—CERCYON. 13] Sp. 50. nigriceps. Ovatum, atrum, nitidum, thoracis lateribus, antennis, elytris, pedibusque rufo-ferrugineis. (Long. corp. 2 lin.) De. nigriceps. Marsham.—Ce. nigriceps. Steph. Catal. p. 65. No. 676. Ovate, shining: head black, immaculate ; thorax with the disc black, the sides piceous or rufo-ferruginous: elytra pale ferruginous, cbsoletely punctate- striated, the interstices convex: body deep black beneath: antenne and legs ferruginous: palpi luteous. The black patch on the disc of the thorax, and the pale ferruginous elytra and legs, at once distinguish this from the following species. Two specimens of this insect I procured from the Marshamian collection: of their locality I am ignorant. Sp. 51. atricapillum. Ovatum, nitidum, rufo-testaceum, capite piceo, elytris testacets, obsoleté striatis, antennis pedibusque pallidé testaceis. (Long. corp. 3 lin.) De. atricapillus. Marsham.—Ce. atricapillum. Steph. Catal. p. 65. No. 677. Ovate, glossy: head pitchy-black: thorax bright rufo-testaceous: elytra pale testaceous, very obsoletely striated: abdomen rufo-testaceous beneath ; an- tenne and legs pale testaceous ; the club of the former dusky. This differs from the preceding by having the disc of the thorax immaculate, and from the following by the paler hue of the head and its slightly dissimilar form. Also obtained from the Marshamian- cabinet, without a know- ledge of its exact locality. Sp. 52. atriceps. Ovatum, nitidum, picewm, capite atro, elytris rufo-testaceis striatis, antennis pedibusque rufo-luteis. (ong. corp. 4 lin.) Sp. atriceps. Kirby MSS.—Ce. atriceps. Steph. Catal. p. 65. No. 678. Ovate, shining, pitchy: head black: thorax bright glossy pitchy: elytra rufo- testaceous, rather deeply punctate-striated, the interstices rounded and obso- letely punctulated: antenne, legs, and palpi of a reddish-luteous. Differs from Ce. atricapillum by the deeper colour of the head and thorax, the rufescent deeply striated elytra, and pale capitulum of the antenne. It is not unlikely that this and the two foregoing insects may be the same species in different degrees of maturity. Taken near Barham, where I had the pleasure of capturing my specimen in September, 1821, when on a visit to my kind friend the Rev. W. Kirby for the purpose of examining his collection, &c. ; and taking notes for this work and my Catalogue. Sp. 53. leve. Ovatum, castaneum, nitidiusculum, elytris punctato-striatis. (Long. corp. 3 lin.) De. levis. Marshum.—Ce. leve. Steph. Catal. p. 65. No. 679. Ovate, slightly shining: of a deep castaneous, with the head nearly black: 152 MANDIBULATA,—COLEOPTERA. elytra punctate-striated; the interstices slightly elevated and smooth: an- tenne, legs, and palpi pale castaneous. Rather larger than the last, narrower, and the prevalent colour of a deeper hue ; the elytra faintly clouded with dusky, with smooth interstices between the strie. The Marshamian specimen is the only one I have examined: its locality is unknown to me. Sp. 54. testaceum. Ovatum, corpore omnino piceo-testaceo capite saturatiore, antennarum capitulo fusco, elytris obsoleté striatis. (Long. corp. 4 lin.) Sp. testaceum. Itirby MSS.—Ce. testaceum. Steph. Catal. p. 65. No. 680. Minute, ovate ; slightly glossy: the entire body deep pitchy-testaceous, with the head rather darker: the elytra obsoletely striated: the legs and palpi testa- ceous, the base of the antenne the same, the capitulum fuscous. The fuscous capitulum of the antenne of this minute insect, and its deep testaceous colour, are its principal distinctive characters. Found in Suffolk and Norfolk. Sp. 55. inustum. Ovatum, nigrum, nitidum, coleoptris striatis testaceis, maculis tribus fuscis, pedibus testaceis. (Long. corp. 1 lin.) De. inustus. Marsham.—Ce. inustum. Steph. Catal. p. 65. No. 681. Ovate, shining: head black, immaculate: thorax black, with the margins rufous : elytra striated, testaceous, with a triangular common brown patch at the base, and a large brown spot on each elytra near the apex: legs and antenne tes- taceous. From the Marshamian cabinet: also taken’ near London.— ‘¢ South Creak, Norfolk.”—Rev. T. Skrimshire. Sp. 56. ustulatum. Oblongo-ovatum, nigrum, nitidum, coleoptris striatis testacets nebuld posticd ustulaté. (Long. corp. } lin.) Sp. ustulatum. Kirby MSS.—Ce. ustulatum. Steph. Catal. p. 65. No. 682. Oblong-ovate, shining black, head and thorax immaculate ; elytra striated, tes- taceous, each with an ustulated cloud towards the apex: legs pitchy-black : antenne testaceous. This differs from Ce. inustum by having the margins of the thorax concolorous ; and from Ce. bimaculatum by the difference of the position and the form of the maculations on the elytra, which are irregularly defined in this species. Found in Suffolk. Sp. 57. bimaculatum. Oblongo-ovatum, nigrum, nitidum, coleoptris striatis testaceis, maculis duahus fuscis pone mediam. (Long. corp. 1 lin.) Ce. bimaculatum mihi.—Steph. Catal. p. 65. No. 683. Oblong-obvate, shining: head black, immaculate: thorax black, very glossy, the lateral margins concolorous: elytra testaceous, striated, the interstices SPH#RIDIIDH.—CERCYON. 153 Fr slightly convex and faintly punctulated, each with a deep round brown spot near the suture towards the apex : body deep pitchy-black beneath : legs black : antenne and palpi pale testaceous. The two distinct spots on the elytra and concolorous lateral margin of the thorax sufficiently distinguish this from Ce. quisquilium; as the former character does from Ce. ustulatum. Taken near London. Sp. 58. quisquilium. Oblongo-ovatum, nigrum, nitidum, thoracis lateribus elytris striatis pedibusque pallidis: foemina elytris macula communi cor- daté nigré. (Long. corp. ?—14+ lin.) Scar. quisquilius. Linné.—Ce. quisquilium. Steph. Catal. p. 65. No. 684. Oblong-ovate: head convex, punctulated, black, immaculate: thorax thickly punctate, black, with the lateral margins very narrowly pale in the male, and broadly so in the female: elytra distinctly, but rather faintly, punctate- striated, the interstices thickly but finely punctulated, pale luteous, immaculate in the male, and with a large common subcordate patch on the suture a little beyond the middle in the female: body pitchy-black beneath: legs pale ferruginous. ‘The male is also much smaller and considerably narrower. Linneus in his latest work places the sexes of this insect in different. genera !— Upon this point see observations in the introduction to my Catalogue. Extremely abundant in the spring throughout the metropolitan district ; flying abroad in roads, paths, and meadows, towards after- noon every sunny day. Sp. 59. flavum. Oblongo-ovatum, atrum, glabrum, thoracis lateribus elytrisque pedibus luteis. (Long. corp. 14 lin.) De. flavus. Marsham —Ce. flavum. Steph. Catal. p. 65. No. 685. Oblong-ovate, glossy ; head black, immaculate: thorax black, very shining, the lateral margins broadly luteous: elytra punctate-striated, pale spotless luteous : legs, antenne, and palpi pale-testaceous. As large as the female of Ce. quisquilium, but without the sutural black patch, and with the lateral margins of the thorax broadly luteous. It is not unlikely to prove a variety of the female of the foregoing insect, without the patch. Found near London, flying in May. Sp. 60.. scutellare. Brevé-ovatum, subnitidum, capite thoraceque mgris, elytris testaceis, maculé baseos communi elongato-triangulari nigra. (Long. corp. 3 lin.) Ce. scutellare mzhz.—Steph. Catal. p. 65. No. 686. Minute: short, ovate, slightly glossy: head and thorax black, immaculate: elytra pale-testaceous, with an elongate-triangular black spot at the base on the suture common to both elytra; the latter punctate-striated ; the legs, palpi, and antenne pale luteous, the club of the latter dusky. 154 MANDIBULATA.—-COLEOPTERA. The black patch at the base of the suture, concolorous lateral margins to the thorax, and minute size, distinguish this from the rest of the genus. Taken near London. Genus CVI.—SpuHeripium, Ffabricius. Mazillary palpi four-jointed, the basal joint minute, the following robust, in- crassated at the apex, the third and fourth of nearly equal length, the former being slightly clavate, and the latter a little acuminated. Antenne rather slender at the base, the four terminal joints forming a somewhat abrupt compact club: head orbiculate, rounded anteriorly: body slightly convex: scutellum elongated: elytra not striated: wings ample: legs rather stout: tibie very spinose, with powerful spurs at the apex: ¢ars¢ rather slender, the anterior with the terminal joint dilated in the male. : Spheeridium, as at present restricted, contains such insects only as have the tibiz very strongly compressed and furnished with powerful spines, the body very broad and considerably depressed, the elytra not striated, and the club of the antenne somewhat elon- gate. The species regard the dung of oxen in preference to that of horses, although occasionally found in the latter; thus differing in habit from the Cereya, which affect the latter in preference to the former. Like the insects of the preceding genus, the species, which are extremely variable, considerably resemble each other; and in describing the following as distinct, I cannot but remark, that, al- though some of them rest upon doubtful points, it appears to me that modern writers have fallen into the error of confounding a genus consisting of variable individuals with a species. Sp. 1. scarabeoides.