Akademiya Nauk SSSR FAUNA OF THE U.S.S.R. COLEOPTERA Уо1. М Е.А. Zaitsev Amphizoidae, Hygrobiidae, Haliplidae. Dytiscidae, Gyrinidae TRANSLATED FROM RUSSIAN Published fo stg Smithsonian Institutio nd the National Science Foundat , Wa о ngton, me by the Israel Pro ae) am for Sci sata Translat И a a Hy Nh | И ui} Sot TES = zat <= exes RY Y $ - ees $$ 2 95 с Fis LENS " у г ттт д ь SMATS UNT Vis у АТ ВИЕЕАТС 24. 2455 Wit Yard tar id 4 ы a - ь tb mS ^ $ cb S24. ZOOLOGICHESKIT INSTITUT AKADEMII NAUK SSSR Zoological Institute of the Academy of Sciences of the USSR New Series No.58 FAUNA OF THE (0.5.5. В. (Fauna SSSR) COLEOPTERA (Nasekomye zhestkokrylye) Volume IV F.A. Zaitsev Families Amphizoidae, Hygrobiidae, Haliplidae, Dytiscidae, Gyrinidae (Plavuntsovye i vertyachki) Chief editor: E.N. Pavlovskii Editorial board: В.Е. Bykhovskii, A.A. Shtakel'berg (Volume editor), A.A. Strelkov and B.S. Vinogradov Izdatel'stvo Akademii Nauk SSSR Moskva- Leningrad 1953 Translated from Russian Israel Program for Scientific Translations Jerusalem 1972 ПТ 90-50173 Published Pursuant to an Agreement with THE SMITHSONIAN INSTITUTION and THE NATIONAL SCIENCE FOUNDATION, WASHINGTON, D.C. Copyright © 1972 Israel Program for Scientific Translations Ltd. IPST Cat. No. 5917 ISBN 0 7065 1208 1 Translated by Y. Zalkind Edited by Prof. O. Theodor Printed in Jerusalem by Keter Press Binding: Wiener Bindery Ltd., Jerusalem Available from the U.S. DEPARTMENT OF COMMERCE National Technical Information Service Springfield, Va.22151 X1/7/3 CONTENTS Е они: ео ое eo) shay ets 1 оо оне NdeI OLMSPECLES HEN Ment AME LR. Ovi ен. 3 О CIENO MIEN Dynatech cos spent we О othe geste ts ae Heb nites ateel Бе нь, 15 Sw SISA РИО Ва lt Ale ollie А ОВ ess cia oes Gem вое 18 ГЕЯ ИО INEZ ONG УЗВ оао a everelln rs 2 setae! eatin ОО О Вон г Во СН ЗЕ 18 аи у ЕТО ро а ПЕ За Е oO load an oa oo 6 а 20 а У Ва О а 24 ДЕ Се 1 ГРИ О а ое ноя ео бас весы а 360 Ирине с иачех ог Ганы ANS ое she vonrs 391 iil ам | ИЕ Wy Wate OT a On у ine Pm + pa УИ ий ный пы С м О у и у ; i eu и И if : a’ у ee | oe ii sae | Y 16 РВЕЕАСЕ The present volume contains the families of aquatic Coleoptera which are closely related phylogenetically and belong to the suborder Adephaga, viz., the Amphizoidae, Hygrobiidae, Haliplidae, Dytiscidae and Gyrinidae. This work is based on almost the whole rich literature on the subject. We studied much material of collections, which we obtained from various institutions and individuals; this material is now kept in the Zoological Institute of the USSR Academy of Sciences. We recall with deep gratitude the advice given at the beginning of our study by the late A. P. Semenov-Tyan Shanskii and G.G. Yakobson. Their leading role in the study of the Coleoptera of Russia will never be forgotten. We are sincerely thankful to A. A. Shtakel'berg and М. Е. Ter-Minasyan for their help in the writing of the present work. G.F.Rekk who made the drawings also deserves our Sincere gratitude. Е. Zaitsev И TAXONOMIC INDEX OF SPECIES* Page Family Amphizoidae 1. Genus Amphizoa Lec. Tbe NS NOOR DIO TERI GATORS в ее eat Sab 22 Family Hygrobiidae 1. Genus Hygrobia Latr. Abe CATO AVSHOPDSGi oil's fe) oie) seine а о aR CG 25 Family Haliplidae 1. Genus Peltodytes Rég. SIP ECEOSUS RLU И ее 36 РЕ: SINCNSIS, (Норе) иене И 37 *3. Р. intermedius ober a A RRM ate Re ee Sie EC ESIC MU Re ERM 37 4 Pee TOCUNGatus (АЦ Ве: Е не 37 2. Genus Brychius Thoms. PARP ES sw OlOVALUS: (PANZ.) «oc. ie ces esa ys eee Miia ea ae Hen) aR | TRIES а ec 89 Oe Deu CLISCALUSY SAD ND В еее Sofa toes merits fells Leper ВИНО. 41 3. Genus Haliplus Latr. 1. Subgenus Haliplus в. str. ОН (8. 5) ODHgquus, (Бабе: 44 *2. H. (в. el) маг NECA oe ae ehh cee ate cat не peut elif ald 45 POW. (5. 5) CONLMMIS SUP Me ее 46 2. Subgenus Neohaliplus Net. НН: (CN ) Поесть са are tale 47 3. Subgenus Haliplinus Guign. 9. CEL.) PULICOMIS (DOG ey sinc ra elise io iat) ayer ee heyho'ty ber i Wiser О 51 *6. Н. (H.) heydeni Wehncke ......... Piao tases ety Nb SI sate (aah be: 52 21: Hee (H.) TODOFtEIEZ ATOM, 2) oo. Sls fecal Tes ЕЖЕ 58 ЗН: (CH) Apicalis; Тов she Syl boy, cm nse tierce Wet vel te ий ИИ 54 *9. Н. i} PON VIC OMS о а Я GS ita des: ЧЕ 54 НН.) furcatus seid) is 2) ek BNI) US i ищи sae 55 Ae Hen CH вает ZAM EN sire cect eo, Re Re tar Aah eae a te Mra tetas 56 12. H. (H. japonicus В АЗИИ ом 56 НН вишме ва een AA RT CLA Bn о АО 57 “144. Н. (H.) samojedorum За. .„ и 57 *15.) Н. г) За О а А ие 58 На (He) fluviatilisvAubé:, ое В АИ 58 * [This index has been photographically reproduced from the Russian original. The pages indicated are Russian page numbers which appear in the left-hand margin of the text.] а $3. ФЛ ФФ] ZZZLZZzZ pt al sal ltaslisciatltaclbaclseltsoltge alles bealaclt=cl . notula (Er.) . ornatus Sharp . politus Sharp . hyalinus (Deg.) . . difficilis Sharp Е. (H.) lineolatus Manh. (H.) interjectus Lindb. (H.) sibiricus Motsch. (H. (H.) immaculatus Gehbrh. (H.) alsaticus Scriba С cele О Wenil relat val.) Jenne О КО ОО ВОИС ОМ ev lie het О еее Ste Мел ие isu ед ее я еее mele ет ) tramsversus Thoms. ............ А ЗО о, 5 Бо eal hole eof lito ОШ 9 4. Subgenus Liaphlus Guign. laminatus Schall. emmerichi Falk. fulvus (Fabr.) . lapponum Thoms. ovalis Sharp guttatus Aubé pelopis Sahlb. simplex Cl. . . Riles ra Zaitz. sharpi Wehncke chinensis Falk. eximius Cl. .. Sees eh See eeGeaees ee Nee ee ee ee Nee Nee See” ee a See See re eee ee ee mucronatus Steph. flavicollis Sturm . variegatus Sturm . basinotatus Zimm. maculatus Motsch. or, Bee neh ее, Yer ов rel Matstne) "tent Зее aioe Wish ое Пере Mie OPO OD Ose ее еде ее Or hi, MOCO OU too, Geo 36 et; et es eh rel) del, Wend fen NOU erp es ее sie ie!) jel fey © Jen kel Aretwwieli mie oi tes i fat en ie ser! Jet sai Byer gen оке Koh ера Met Це Пес Wen hepa terrae) ООО ere ie Yell ken tee Meru ОВОС ПОЛО Wine С el. ef око о 9 ха ВКО bea. isa” Hel кОм О ep et fel me) re tam erey ge te: ef Сосо бор ООО ооо а Oi) Ger СООО Gory) Оооо oc а ЮО О она, santa еб Pare Mir iely. Rev ate May ее ОИ о еее ie) | fey ter ‘Hell! За ПЕ Shy Neh) ie, ее ее ое Oy Hea (ean ney Mell Mell eter fethionet | felted te) ее ео Пе laces lel Key ib efits ее ее Us) nen tlienW nell mire «И те Piel ieee is eh olay с gies: let оО ооо © eR Viel inte) can!) ООО Ко ООО СО Nel Mie: Rie) Ney ООО ey lel) И Я ven) feito Иа nro lites}? бер ме elon | hes sels lua) ее ее НЫ ei) Teh fete tay) Waal! voll Kone Boys ha) lial) hel) Wisse ое ое \irey 15 aie Welk same Family Dytiscidae 1. Subfamily Noterinae 1. Tribe NOTERINI 1. Genus Noterus Clairv. . crassicornis (Miull.) . angustulus Zaitzev, sp. . clavicornis (Deg.) . . . ponticus Sharp . japonicus Sharp. . . granulatus Rég. . ere’ en lel в | bes Mey ret. sed) Hep fen дер ей fem eer еле ее Це ® О О ОО OM по о co ea Mp a) Ga. © eye Sieh vey ee ey ce gies bret) ie ure, се gle Se Ле СКМ + ef Yoh voile) piel jieg fe ее | fan" oe: ем ее ое cer fe. ike: oye Pie fer. evo ley nex ее eve fel wim с еее ар (nel. Seyi fen) helena 2. Tribe HYDROCANTHINI 2. Genus Canthydrus Sharp . ° . ° ° ® ОО О ОНА ИСО ео от 5 ет Cun Creal Cla Де еде ие Ко а welt ее ее йе Ще ее еее ее ее 2. Subfamily Laeccophilinae 3. Genus Laccophilus Leach minutus (L.) et ° ° . . apicicornis ВЦ г... . variegatus Germ. . . vagelineatus Zimm. lewisius Sharp kobensis sour sharpi Rég. . solutus Sharp . fas) Niven еее Koln еее а ee eT PR ann eu Фе ео еее OF SO 6 СООО ПТО О ТОГО 3 210 С О О О ОАО ТО" О ОВО о О 98 98 Ога Pe ooo oe ыы ши Н. musicus (Klug) ......... H. rotundatus Gschw. ie ae BO OD OD Od OO Oo Oo Oo oo Oo od bo oO OD Oto to 3. Subfamily Hydroporinae 3. Tribe HYPHYDRINI 4. Genus Hyphydrus Ш. Hiovatus (чет... . laeviventris Sharp . . ad . orientalis Cl... .. : rie te, We . japonicus Sharp. ...... я, . 1Кепяхгбии Gschw. ..... . flavomaculatus Kam. 4. Tribe HYDROVATINI 5. Genus Hydrovatus Motsch. . cuspidatus (Kunze) . adachii Kam. Ни PA POMICUSIMAK RETR И, оон os suf eae BEN поете Sie Тоосвоуе ля Кате Bi ese: is oh ose oie) oa A) ооо све. 5. Tribe BIDESSINI 6. Genus Bidessus Sharp pusillus (Fabr.). ...... SME War ee ae min ae ‘ ‘lat т 4c eons tate ke hee ek а ania ummeli Falk. > Певцы Feng. 22) ИО Нун yochimurai Kam. . Signatellus yin basen ata ad Pa - . hamulatus (СУЦ.)....... . confusus (К1и8)...... pAlb ole . minutissimus (Germ.) ........ . delicatulus Schaum Е ваще DESDE и. . unistriatus (Schr.) ... . grossepunctatus Vorbr. ......... . nasutus Sharp ...... . . exornatus (Reiche) . alienus Zimm. a Е . maculosus Gschw...... . 7. Genus Yola Desg, bicarinatar (Бах) т. ое 46 Mets “ee s'o\s М. 8. Genus Clypeodytes Rég. sfPONGAlS SDAP о. о CMS а sys ‚ perforatus (Sharp), орк ok A Sak sSTACHlis Саб. о. Е Е 6. Tribe HYDROPORINI 9. Genus Hygrotus Steph. sdecoratus: (СУШЕ) ли. а Caen : inaequalis (Fabr.) .......2.2.. aequalis Falk, ...... versicolor (Schall.) 10. Genus Hypophorus Sharp ey Keio, Mel в, © oye те jlevie)" © 122 123 123 123 126 127 127 128 128 128 129 129 11. Genus Coelambus Thoms. #1. С. polonicus)(Aubs) ies а о 134 *2. ©. impressopunctatus) (ева 9) 0) 2150 ove a eae ee en 134 3. ©. CHINEHSISNSDALD wy) See i eee ante a toee gy NNR eI ek bertinrey ие 135 #44 ©. VICEACUSHOBARD Mw s ihe k vee ce eg a), Seek eee Ral gi ae 136 *5 C. parallelogrammus (АБт.). ...... 2 (8 са злее 136 #6: С. агтешаси8 24162. | сое аня 137 97. С. lernaeus (Schaum). о ое pn ae 137 #5: С. S@MONOVI, Так. и осо фа р ae a Ee 137 #9; С. corpulentus, (ЗсВаит) ...........- м вое 188 +410; Cx saginatusy (ева 138 #446 С. UNBONSIS| TAK eel couse. ое И ep deh vel ker ole 138 #420, С. novemlineasusy (ар 139 #13. С. mongolicus, Лак. ом. tax.) te Woe oe a ee cee 189 +14. С marke (бу 140 foe GoyMSCFIPtuswOnarD ek 8. oS IR So RNA I Bs RE ene ee eee 140 “16°: С. uzbekorum), Zaitzev;; Spe пе dene eo Пе 140 эр ©: nigrolineabus, (Ут ene ee 141 ж18, Стоп черз (Кавк:) tao eat Vice. cha We Ws AR е 141 19 © раша ((AUDE) и. 142 *20: С. caspius) (Wehneke)i,) я GAP RS nel oa ane ber ily oa 142 21. С: тебе да 142 *22. С. впоеабтатиыь | (АВ, ihe. To ine tes det ale eer aM eal ra: Sail slits Daa 143 #23) 'Co;pectoralis"(Motschs) д... ee) Sete 148 #24. С. flaviventris (Motsch.) .............. Ie ROD EPs 148 25; ©. trilineatus "Ее... оне. eee See Eee 144 12. Genus Hydroporus Clairv. 1. Subgenus Suphrodytes Соя. Pile HO (S2)) dorsalis: (Бабе). Зе OER Ce aea ee oe 146 м: Н. (5) lapponum), (У 147 2. И: (Ss) arcticus ТБО, ое И и" 148 £4) Ho (S2)tomentosus Poppe р оо 148 coo (Sa) submuticus™ ВоВ ое 148 2. Subgenus Hydroporus в. str. "6. Н. (82; str:)\ scalesianus Steph... ол... И ОА. 158 S02 Ho (Ss. вы.) angustatus Sturm 20) 02.0 sa sien hate noe ate ee ee 154 *8.° Ho (3, str.) ‘piceus Steph: 2.00 aaiae ee aerate on ae 154 oO. Н. (3. Str) tristis (Ра , 165 "40. И. (3. 5.) DodemeyerGanglbs 6. Men ae ya an ee 155 Sit. ИН. (3. т.) umbrosus) (СУП) нее cee ee ue aca ate 155 12. Н. (в. вы. ) glabriusculus: Aub6 и 156 213. Н. (6. str.) notatus Sturm с a) SNR RE | 156 #14. Н. (в. str.) palustris (В) осу hi SD, RRR TAN 157 215. Н. (3. ЗЫ.) incognitus Ваграм ВО 158 р (Gyllo i Ori el Wee Lia Ganon eM Miia tadcaite abel 158 "47. Н. (8. str.) breviusculus Poppy ее о 159 "18. Н. (5. зы) (ampliatus аи 159 *19. Н. (3. str.) jonicus Mill. И И а 159 >20. H. (3. str.) punctatissimus Popp. ... ее. 160 721. Н. (в. зы. ) егугосерва ив (Г) о и с 160 722. Hi. (8. \str;)'obscurus Оба о 160 $29. Н. (8 str.) elongatulus Sturm |... О ео 161 +24. Н. (3. str.) melanocephalus Mrsh.. . . 2... 0... .. 161 $20: Hs: (avistr:)) Cartaricus: Бос ns aie ea Augen 162 soe: Hi(eryate:)tmtiolaZaite. а 162 ae H. Я АЕ В UA SC ae re er 163 pas н.в str:)seugeniae д 163 #29. Н. (8. str.) marginatus (Duft.) и. 168 30. H. (8. srt.) goldschmidti Gchw ............ Go) RRO 164 ЗН (5. 51.) planus" (Бабе св, 164 ЭН: (8: 5.) Бтисю Меднеке в... О 165 *33. Н. (3. str.) pubescens Gyll. а aM 165 ЗН (See зе.) (USCIDERMIS Беван. 166 a Jel (© oe Ко) "ОВ ое ое ЧЬИ 166 *36. Н. a str.) saghalienus Tak. ap ye ae stale. rata aaa 166 *37. H. (s. str.) tessellatus Drap. 167 Ва: Е: (5. eStrs) ezimmermanni МО: не... 167 ВО. (СОМ ни 167 40. Н. ($. str.) antidotus Sharp а 167 =Ane sini (В. 3. уасшаприаз ет 6 отв... ным 168 MADE AHI (5. 5 теме Rey баыь, и... 168 *43. Н. (3. str.) discretus Fairm. ...... Cee Na 169 т (5 Витара, REL... ad. Е 169 45. Н. (5. str.) tibetanus Zaitzev, зр. Tf eee Е 169 ИБ НЕ 156) HkozlovskiiliZaitzs ола М. В... .. 170 ВН ЗС вЫ ан Нее ne era eS enn 170 ОБИ (Зоб ег EWAtAnADO! Так. ye. cc) nas aces Weles de Ke 4s ам 170 ЗОН 15:36) SMEMNONIUSANIC., °,.. ¢s 4. es sens we pees de дозы, ПО SA 171 *50. H. (s. str.) glazunovi Zaitz. Е Wheat andy 171 ВН. 1511: ) TODSCLECUSHA UDO Mh ен. 172 D2 АН: 4(8.8Str:) slibanushR6ge>... 7 3.29.8 8 WR FOL и... 172 о (8 fctr!)MerrupinousiSteph., о. ан пом в 172 А 1. В мае ба о нь 172 Soo sH-i(s.estr)punctipennis ваыь. 2. 3. oe 178 ОН ВО и о ое 173 3. Subgenus Hydroporinus Guign. RE - (НО) асов аи ое ее. ss olor се о о щей © 174 58. H. (H.) ongulus Muls.. . еее ee ee ee et es 174 SAGE eH cy (EL )MONGICOFMIS|\SHALD ео... А | Memoutloled) © 175 *60. H. ae ереси Спам ао oh ene selcuucinaae’e 175 ВН. (iH) MelANariUseSCUrM a7 05. Si sa oy oh dd op ous ae oh poppet, БЕН: 176 SOC SMH CHO) DICICOFNIS SAD у stuctiven are ов = 176 Garey (Hi) PUulpNOt GSChWal i iinet О ep ion eh ie Gall: О НИИ 177 13. Genus Laccornis Gor. Abe PODLONTUSH(StOPD ster. oh ct on sy elit aie ay по аа 177 2. Г. breviusculus eke EMSS А SAAT CME eis ar sen Sel CH ieat 178 14. Genus Graptodytes Seidl. ИС раса: (MaDe) не... ЕЕ 179 2. С. VELOLALOR Zim) ое | Me I Ye В о 180 *3. С. АН Я оо ед ее 180 *4. С. bilineatus (seid) Pepe COR cae AUTRE HN cbt Moh aah apt cate, ON og Cop pn nme MTS 181 15. Genus Scarodytes Goz. SACHS FMALONSISN(MADE.) ео Kot Nae а ель > 182 16. Genus Oreodytes Seidl. SAO a lpPinUs (DUltsym cerita oe ее а an eee O. dauricus (Motsch.) т Fen he gta on 194 OM KANO CAIs о. ме ee Os MOFERliS (ОУ ооо ee ok MOR: Pee oar amie 086 ©. septentrionalis (Gyll.) В С ng Чо ЗБ 185 пом VALS (СУ Нео saa CaM ой 4 17. Genus Porhydrus Guign. a Peelineatus (Abr) ii eine) Cel a. eihret rah ellies eine! oi lien aiken ое ие A a 97 . P. obliquesignatus (Bielz) SUN eis On eee el ive. НИ А 187 ie) wolalaloie)-) ZZ НН О MSM О НЯ О MO О НО О ко о о мо > = ® SOS Cv et @ ооороооооо = 18. Genus Stictotarsus тю. » duodecimpustulatus: (РаЪг.) сос... оО в 188 19. Genus Deronectes Sharp » Зав (Stephin tate ne ot ris tle вол aera Но 189 longipes Бар. 189 . sablbergi i (itam. | eee о А susleanity mee he Mee 190 + GOPTAO NW SDALP YE 3) te Mahe ace eG, Miele О i PR MeO ae OT ARE a . 190 „ parvicollisy (Schaum) 7.005737. 87005) oe ee eee ее SE) 0) v @DNOPMICOLISHSeme ‘нь с, ee ee Е . vestitus (Gebl.) ...... они meters hs 191 20. Genus Neonectes Zimm. fy JAKOVIONA ZAIUZ еее ее ее ue! us) wa he rhe ааа oh) te 192 ° natrix (Sharp) e e © © © ® © e e e © e © С В Сац Сдано ЗО Oli en) a) 192 21 Genus Potamonectes Zimm., s @ruseostriatus) (Феб. о По а. 195 емшенсви а а ое 196 COLES VINCAUDE) aM FY Sa: obs ay Pe se ро 197 formastern(Zaitz sir ils: "en eli apa (AMON oN etal ae ee SMe eee” ahem cee - 197 VTS HOVE) ИР ose ott ne) ale AL Ud Mat о В о 198 assimilis:(Payk.). т Meher ner HO eciwnco не 99 sulphuricolay (ава. oes ei ere Nee, te ae an Te ial ны a rt!) hostilis:\(Sharp)i. К. 200 anchoralish(SDarp)* *a.ton te Sa to the Rahs wo eeu: a cer eee ee ee с 201 depressus (rape ym Е iar tals оне No agsemiayne ORG B'S, HAP 201 elogans Bangs at hi MRR NSN RCM О Пе sei uc Pees 202 Та Werrn Ah yet eth Ne Rm Oe een ee ce oe ape 202 variegatus (Aubé) ........ О ео Maisie nati ob Wisk АТА turca (5е141.) ..... И О уно pees Ио ОВ . Stearinus (Ко].). ..... А с о ООО . laeviventris (Reiche) ............ О НЫ of 5 Oe ‚ simplicipes\(Sharp) 2 203202 Soe Ba es eet ле Ol О о kc tai о 605 7. Tribe METHLINI 22. Genus Methles Sharp * Cribratellus Fairs ине aS aR e 206 А SHARD ue usin eh. UR Aly lok euro ay amicus и Gane: sn 208 4. Subfamily Colymbetinae 8. Tribe COPELATINI 23. Genus Copelatus Er. - haemorrhoidalis (Раъг. тосе a ee eS 208 2s CRimensis Нос Я aI 208 - collocallosus Falk. о. 209 -) арош сз Sharpe. yo ye le м. 209 ogasawarionsis' Каши а. 209 LOFAmishii Ка и 210 - koreanus Mori. .......2... 210 3 discoidens Sharp) one Yes SH VRE OH A UTRSD a uence ie nae 210 ‚рака ее 210 zimmermanni Gschw. 211 КОСО О On isc Mae EN oii od Vcr ACO ооо лол Clb аи LLL LL, lm fm, 55 ооо ооо ооо ооо ооо шшфю,оооооююшюшюю РРР фороофорроророророро`роф`рророророфф`ро`рофороррофорорфороороф`ор ооо шишоо 9. Tribe AGABINI 24. Genus Gaurodytes Thoms. 1. Subgenus Gaurodytes s. str. Mestr;) basalis: Gebl.y.) 51 аи ee ee Sed 224 В.) caraboides Sharp) .° 2° 24° 3° 2". ' 6 nye ee et oo Paks aes 225 Srstrs)tbrandtieHar. о sues eee 225 аа а jn cect Gi ah eka" Yeo An ee ue р оо 225 mastrs)elongissimus! (Rég.)\i>).> 707 2" 2" «ny ея 226 str’) Ованес 226 aystr))rsvenhedinivRalk.,'..°.%..0.' of 30 o's О a 227 ‘eatr:) nbiguttatusy Olive 4: саме ee Meee sek epee gee 227 custr))pglazunovi. Zaitzev; sp... BR... и 228 Зо) урока наз, (Payks)) А eee An oo eceae. 8 228 измена ка ое» (Bre) 260 60 bie а pad Uw os 229 mstr)iglacialis:(Hochh:)) о: аа. 229 Sestrs)\spallaestinus»Zimmy не in reas eh 230 festr:)ejenolensis: Ка. що 230 PEStr) ad pressus:(AUDG)) а аще © > 230 “.str:) мазазыеграт, (Зав Ъ:) 1 у. 05. berm в. Ре 231 SUL) SHARP! (CTACODS: eH 5,8 si В а м 231 erstr;)opacus (АцЬб)..:1 1... :. 7. д ОЧ ИИ Ae 232 зе.) sachalinensis Кам. сие. 232 str.) ре а a, Cy "232 авт изо зу (Talks) иен. до MEN NEP ee al veh eine «s 233 таг) зоном (АВ) ее 234 istr:)‘striolatus (СУЩ вия, Вол чо... 234 Из) meolanarius (AUb6) ......... че м-в 235 SBS) 7 CFIStIS;CAUDG). 5 Wo sinetes ee a) - м мае. 235 Зет.) nigroaeneus) (Е т.) т, и.о ра ое ве 236 ‘ a ИЕ еле ses ee as nat ИСО де alia, votes ean doe untae 236 SUSU) eNEglOctUs (ERS). oiciy). 0 oso. ct cs ge os oy a ope pnt logy enone 7 fay tees 236 str:)chalconotus (Pang. ei were инь 237 “'str.)'melanocornis Zimm:.. ..... 5 tiie) similis 218). 238 АЛЯ mei. о ee, ca for cules ven ne or abner ов Зе UNGUICUIATIS SI MOMSs ось оне се 239 хана (Рае 239 astr>) Diguctulus ME MOMS! ооо ох с СО ИЯ СВЕ. 240 ор са 68 ар ое: 240 ; rh stygius Bee: Е Maer tbe es PREPARES а mc) an! Pel ie alee aes 240 Зо о Ба о ое 241 Вт) га Чета а еее. 241 Зиг.) paludosus (авео. 241 5х.) парловов: (о) О ВОН и де. 242 5 ae 2500800128162... ул. sree ks рав» gpbuletent. 242 . str.) zaitzevi FOr: а ее ое cok ent aD ВОН 243 .-str:)*luteaster (Фалес. до. че менее 243 -.str.)amnicola Sahlb. са. смо Зезаемавый. 244 и) оо, Е 244 SUP.) ATCUICUS PAY We) ен No he tat 295 5p Str-), zevverstedti (Thams®). К. 245 sg SUE.) SLOW ZOVA Зав. |. оо оо «Hoan Е 245 Ca SUL.) ;COMSPIOUBS, SRAM ‚рен с те oir one ks eens 246 ESR) KUPHOUSIS Кано 246 : a4 Orlientalis, Ка а сес 246 сз. сопрепег! (ПИВО: ое ле 247 . str.) lapponicus Thoms. ........ СЕЛ ua latina 248 ы Е thomsoni За 248 Str.) COstulatus Мос В: ое. В 248 SCE )MATOIGN AMO De ere ae sek eck areal Cae teenage acer ates 249 =) str:) slevanderi. Ношу нае LY.) ih ee ee 249 / Set.) tibetanus) 72а. ре at ct ic ПО 250 . Str.) pseudoclypealis Scholz. ........2...2...-++48. 250 ; a nigripalpis:Sahib seve ci о ye ee 251 = Str) \CLyYpGalis, Тов: 8 i026 bese uh sp hgh те 251 POM оооооогобророосороооооороо Od be oe 9 >> ooh . (An.) semenovi Jak. 0 ae sogd . (Ап. . (Ар.) bifarius (Kby.) . undulatus (Schrank) . labiatus (Brahm) . fulvaster Zaitz . serricornis (Payk.) . clavicornis Sharp - maculatus (L.) . Pictipennis Sharp . escalerai Rég. . . fimbriatus Sharp . lunulatus (Stev.) . Str. . Str.) desertorum (F. Mor) . Str.) sawadai Kam. . . эт.) kokkoson Feng. 9.) * 0) 6. hee oo yh Ве Св" . str.) setulosus Sahlb. . str.) amoenus (Sols.) . . str.) hummeli Falk. . Str.) regimbarti Zaitz. . str.) sinuaticollis Rég. . . str.) japonicus (Sharp) . Str.) rufipennis Gschw. . . Str.) daisetsuzanus Kam. . str.) aequalis Sharp . str.) aequabilis Gschw. . . str.) mucronatus Falk. . str.) chinensis Zimm. . str.) fulvipennis Rég. . Str.) granulatus Falk. . Str.) confinis (Gyll.) . . str.) infuscatus (Aubé) . Str.) fuscipennis (Payk.) . Str.) coxalis (Sharp) . Str.) nebulosus (Forst.) . : ae . Str. : ae conspersus (Mrsh.) dichrous (Sharp) friedrichi Falk. . lineatus Gebl._ . ef er Wh oh abl el № Pl eta teh vient fen) Чел АЕ ее а fet) os) ell ven Ве Ce OMe, < Oy во ote СОСЕТ, о. 30 еее er ее ey 0) А о ее fe) | wo ре eh, Wel: Pred ОО iol) fu ВОИ Оль С oF gel Fe) er) Ww) fet) ol et | el ap eeete) ey Je) op ken) de ep) Veh ties) den 66 ГО 2. Subgenus Anagabus Jak. ianus Jak. angulicollis (Rég.) 3. Subgenus Hydronebrius Jak. . (H.) cordaticollis (Reitt.) e e e e e e e e e ® ® 4. Subgenus Aprctodytes Thoms. . (Arct.) elongatus (Gyll.) . . 2.2. 2ececcecess 5. Subgenus Apator Sem. 25. Genus Eriglenus Thoms. 26. Genus Agabus Leach 27. Genus Platynectes Rég. . dissimilis Sharp Coen ea hen 19. Пе №. а о, УЕ: ee . . OW LOR А Ме > О Fe) Usp о ОИС ООС ВО ОО Я О О ОВО ЗОО is О С Е И SO Se О a О ОАО en CG Оо. О © Фе © Фе ъ. ео, © © em Or NOS OPO Г. бы. сс оо © ее ей еле lee © e e e о @ © @ e e eo СИ О le) jen Lies Ve), fer ie) ve? es. le) Vel rem J) ПОС ИО ПСО loti. Bree ler Miter. jet, hee ei vel ee, о le) cel © eR ee ey Зее че etl ce eke fel ey ее Melero meet iel men (ee. Jee. eliewcensre) fe) glelrkel i elmie) Ot ied el Lah Vell ce). she) “ses еее Зее одет cop .el ее ще Biel Ukel ое 28. Genus Platambus Thoms. ee) iwc ek fell) Tet Kell fen heey Tog) oly ey Vie ь оао ей elem believer ое, По ie Oe ey ene el. ее ey Tek (ey ei) ое fromm о ИЕ обе Mal felt. kel ie ere Mette? Jere teh heb ite! «er we, eee et ely Yel se) ei ie le) Leip) eg! С Moen et Male Tio Оаь оао ны 1 Mali them \e) tile’ СООО ier О \\ehiit eit Оо iii eV tot rey Mess iTehy nits ag о ыы ыыы ee ee | . оооооооооооо 30. . ($. str.) ршуе . (s. str.) sikkimensis В Е a(S-scr.)rovalis’Gschw. блох есь сю» ФО, (в. Str.) aequimarginatus Ка Е а. . (3. str.) regimbarti Jak. ........... Е а ое оо (зе. ) пота (Е аЪг. 2... 44 4 4 4 3 PEE a Me i cr АИ (8. str.) notaticollismAube*) есь PR И. a(S. scr.) yessoensis*oharp не LS Se ews ао SUE.) POrraciCUSWONARD (hy ho nigh еее вы.) suturellus’( Harr.) 7 20% ель. . (8. str.) bistriatus(Brgstr.) ем. ое (воз. exoletus)\(Forst.) еее М а . (3. str.) latita (Sa ЗЕ.) INCOMMItUS (SENOS. И. ее еее . (3. В rufus . (s. str. consp (№: старец (СУШЕ) а ve Ree oy о... ь. ее 10. Tribe COLYMBETINI 29. Genus Tlybius Er. . fenestratus (Fabr.). . .,. ......... Ch Е О . ater (Deg.) . crassus Thoms. . poppiusi Zaitz. . =) quadriguttatus, Boisd. et ac. °,/.../.. 28k а biel a, . Similis Er. .. . Subaeneus Er. . . guttiger СУП. . . angustior СУП. . obtusus Sharp . aenescens Thoms . ovalis Gschw. . se Ulipinosus) (FAbE.)ic- +. 6c. pein. lye ve ta: pe, te ne do yo ME, Re, в). . lateralis Gebl. : . apicalis Sharp . Cinctus Sharp . eh о Maes ое | Vem ineal ele elute. sea went ire: ll oM ее оно oi Nie! Mie) Piel Bre, Но. Мо: Ко (ete. | be АА fe), НУЛИ et leh ite оао ео) Were Mie; Bio мо: We ве Fie. ео (cele De MieMnel= | aa fol Wei UWeh | s oy Mele Fete! Me 55. Me Fe: Be No: ИЯ ИО Nalehok. a:b lea le stan, ic С ОО hie Ale Ries He. Ve Neto!) Yeni te meer В СО 60, tse ое ‘ea $ Ne Fie) Ко Ме Ме Me Hel Hee) те Ne Me He) о ен 9: lei ite? wie ay rey Wie Ме Mey Ко Fie! Жо Se | oh Reg wendy c! Kel о д. ча sled (ci oes Fett ey Fetch) Fie!) Mem ООО. Моно ООО Wien) Tell ‘ek ew tle, Ane so в: № Meo Rei Зе; Шо Me. Me} ве №. ВА ЗАЛ с] Wiel Me) ates 6 © Ре Bee: Ме) Biel he Fhe: Hee Mel Боб Коле Ао Wiel Vey, МЕХ. ри фе Фе Ol SOM Ц Се а ое Leo: а Genus Colymbinectes Falk. 31. Genus Rhantus Lac. 1. Subgenus Rhantus s. str. rosus а о И aR ei 8. Фе еее ера еее ее еде heel Пета ns Shar м и В о Me air a amewa a ete AT Nea Au ubus (SGurmy rn te tate се le elt te: ео 2. Subgenus Nartus Zaitz. 32. Genus Colymbetes Clairv. . paykulli Er. . м ао АО ее ake . Striatus (Г.) . . magnus Feng. . koenigi Zaitz. . Фоабгавов; (Раук.).. чо... NS о. О а И Ее т мц нею ПИ ВО ОР О СЧ ЗВОНОК СИС ye. (le ey re: ое feito) fe, hve че ет еее о. еее: Кобе деле пер ее о ©)) 240 Fe) fe, We. Va: swe Ne! № © de. hse: © ` оао Де о, Бе Го СУ О Das ye ee ie fies о И о Оо semenovi Jak. wih Tey ; tely ey) fer fe Fe!) se) ce) ete js0)) ce) je! 40). en) eighke! Rope enw © inrern gen cer neu, © tschitscherini Jake... ne a ось. minimus Zaitz. vagans Sharp . Sticticus (L.) . о ео ver ee hee ee) ee | ep, ene ое о ее ое лога бел ei hep te. er Ot ce eye Helv ate iene: 0), hen Her wien Vee, we} eed Remme fogeleniielcerpeeh, .0: i; Retr me 5. Subfamily Dytiseinae 11. Tribe BRETINI 33. Genus Eretes Cast. 303 #4) Н. (8: зы.) stagnalis’ (Fabr.)) |... соо ARE Bee 82. H. (3. str.) seminiger (Deg.) ..... ое Bis pe US” Sa О - 23. H. (s. str.) schelkovnikovi Zaitz. ................... *4. Н. (s. str.) laeviusculusPopp. еее oe ue te ee ee a *5. H. (s. str.) laevipennis Thoms. .............2.2... *6. Н. (3. str.) rugosus Popp. ......... ot oe yor и р cogs ere *7. H. (3. str.) transversalis (Pontop.) ........2.2.2..... *8> Н. (5. ‘str.) grammicus Germ. .< .. .« ..).« .6 4.0 ао ee ee 9. Н. (s: зы.) bowringi Чак’... 66 is se) oe - 10 Н. (sscstr:), vittatus (Fabr.) 2 еее ее . 11. Н. (5. str.) histrio Clark : Aa Swed atic. heels rele с 2. Subgenus Guignotites Brinck 12: H: \(G.)cleander,, (Ossi) це Wis “outs. “ste te es es ee ee ere 13. H. (G.) ponticus rai Sheet faye, ag Sip Voi) adh ogee Stee eae mec И 14. H. (G.) fabricii Mac ay о Diecut ak VENUE 15. H. (G.) thermonectoides Sharp ...........2...08..48448 13. Tribe THERMONECTINI 35. Genus Graphoderes Aubé *1. С. austriacus (Sturm) ........ ROSE ра e234, Ge Dioner ZIM M wi tyisy 6s, ahs, oe 8. abies Os ee eas erent eee fon Gs vadaMsi Сео a ое за. G. bilineatus.(Deg,)., siete 0. 3 се ще Loree eae Meta tama hd 20 С. ‘cinereus. (I;) 3 se ee И nmr HED Ey tts iis bes eae . *6. С. zonatus Hoppe ........ RS а И *7. С. piciventris Thoms. *. .......... Дей ODES SANE TOS ORO ам Sali 36. Genus Acilius Leach *1. A. sulcatus (L.) ...... oto ai TSR ое RRM UNS MSH EN *2» А. -canaliculatus Nic: ssa). с = « « « » БЫ Peete: о м 3. A. sinensis Peschet. ......... оо ПОМ Е © 14. Tribe DYTISCINI 37. Genus Dytiscus L. 1. Subgenus Dytiseus в. str. “1, Ю. (в. 36.) latissimus 61-13 ев ее. в бо 2. Subgenus Maerodytes Thoms. $2... (М.) semisulcatus MUM. неон Se ei 3D. (М.) sharpi Wehneke Л съем sig 4. О. (M.) validus Rég. ...... а OE 39. В. (М. dimidiatusiBrgstr, нес a ee *6. D. (M.) delictus Zaitz. ...... MURS a arise ie Nee ates A 7. О. (M.) pisanus Cast. ..... И DN WE ett) ae PRA ciate ean, aes *8. О. (M.) marginalis L. ...... Е ое $9. О. (M.) persicus ЗВагр..... ами № ско EW ВЫ 210. D. (M.) czerskii Zaitzev, вре ee а АИ же 1 О. ‚(М.) lapponicus СУ хи. Зорь а о. пен вевеае *12. О. (М.) circumflexus Еабг. °13. О. (M.) thianshanicus Gschw.. ........-2..-2-.. *14. О. (M.) latro Sharp . ........ Buca ИМЕ 15. D. (M.) distans Feng. ....... Е gee *16. О. (M.) circumcinctus (Abr.) ...... SRE LG fee ии “17. О. (M.) dauricus Сеы......... на 12. Tribe HYDATICINI 34. Genus Hydaticus Leach 1. Subgenus Hydaticus в. str. 321 324 325 325 825 326 326 327 327 328 328 329 329 330 330 331 331 ИС: brevis ‘Aub +.) 24.) «ser 2. С. sugillatus Er... .... *3. С. tripunctatus Oliv... . . 4. С. lewisianus Sharp ... . 5. С. limbatus (Fabr.) ... . *6. С. lateralimarginalis (Deg.) . *7. С. japonicus Sharp... . *4. Au. concinnus (К1.) .... 2. Au. striatus (Fabr.) ... . *{. С. (G.) minutus Fabr. ... 92. С. (s. sai urinator Ш. .. ®3. С. ie str.) paykulli Ochs. . *4,. С. (3. str.) caspius Mén. . . ®5. С. (3. str.) suffriani Scr. . . *6. С. (8. str.) natator L. ... $7. Ц. (3. str.) substriatus Steph. 8. G. (3. str.) mithrae Zaitz. . 9. G. (s. str.) curtus Motsch. . 10. С. (s. str.) colymbus Er. . . ®11. С. (8. str.) distinctus Aubé . те а (s. str.) libanus une ЭН 13. С. (8. str. troi Bene 14. С. { ae Е 15. С. (8. str.) luctuosus В 68. . ®16. С. (3. str.) dejeani Вг..... 217. С. (3. str.) japonicus Sharp . 18. С. (8. str.) orientalis Rég. . 19. С. (3. str.) marinus СУП. . $20. С. (3. str.) aeratus Steph. . #21. С. (3. те. pullatus 2а 2. . ®22. С. (3. str.) opacus Sahlb.. . ele 2. oo (aXe) 15. Tribe CYBISTERINI 38. Genus Cybister Curt. Orn om ео ое em em ото fal ВЕ eta sel mel "ou Вене Oi) yay key Key je, (je) [ney je) 10; fe) :0) He) adel Sen ‘le Bien. Ja tele) @ ejte СО Сие ПТО le) ates Jel Ne wiser ve." ГОС ое Family Gyrinidae 1. Subfamily Gyrininae 1. Genus Aulonogyrus Rég. 2. Genus Gyriaus L. 1. Subgenus Gyrinulus Zaits. 2. Subgenus Gyrinus s. str. ООС ОО ier [nel ie" tie) И ОАО ООС СВО И о рае Феде ое: еде ее ais) Де ples sake: Ce ое vey ле ПФ ее: Пе Иа ИОН Че ее ИФ о «еле. Ве СЕ ее Ца Ис. еее С МО О К Кона ОО Ome Ory? BO ово С ООО ее еее ее а ее Нее еее ее о ео ее, Се ее file! Неее обе еее еек Ose SOOM Che tne aD о А еее 2 Но белке Па Nope Cat, pt ОЙ ОО оО ОО OF св Gar Od ОТО kets! xe) tet) jet, folk СООО ОО tel СИРО sve) ОО САО 8. str.) convexiusculus Мас Leay ..........4+-++-+-+-.- ae Very ter teh! oe ven Merl Oly ule 1 Os (Orr es ye), - le eae. а tem 1a fateh es Ome СЪ О eh Sieh ito ое Зое К сое ive. eur tenn wie ei) Kel” en Ke © Oreo Фе Че Це ve) 16 еее melee.) es rey exe а nel рее еее ое еее ое р ее ес ели nem Wren Те Е е ieee vent (6, Фе ее Че. Ney, Пере cel, Че ее co! те ео ео ое Fer) ies песен te) ее sien oe Jon, Че ek Че целое en nie бе see vei (et tere) en) se), et pie ope fom der. le, ery nee len чат Or he, 2. Subfamily Enhydrinae 1. Tribe DINEUTINI 3. Genus Dineutes Mac Leay orientalis (Modeer) .... unidentatus Aubé..... 3. Subfamily Orectochilinae 4. Genus Orectochilwus Lac. 1. Subgenus Orectochilus s. str. . (5. str.) уШовиз (Mill.) . . ($. str.) involvens Fald. . . . 369 369 361 *3. *4. QO (s. str.) punctipennis Sharp ......-.- +--+ ++ +++ sees 863 (3. str.) zeravshanicus Glaz. .. 2... 2-2-2 2 ee ee ee eee 364 (3. str.) obscuriceps Rég. .... 2. 2-2-2 ee ee eee tees 364 (s. str.) regimbarti ЗВагр 2 2 1 1 ee ee ee еее еее 864 (s. str.) agilis Sharp ......... eee Moen У, ЧЕ 364 2. Subgenus Patrus Aubé (Ps) chinensis@RG gerd. yo meyer cv. 1) Met ao We! Hel ho (A tPoy Pev nc) P-) a Ray ot eT 365 17 INTRODUCTION Some families of aquatic Coleoptera belong to the suborder Adephaga. Most of them are predators (Dytiscidae and related families); they are sometimes highly specialized (Gyrinidae). The aquatic forms of Adephaga differ generally distinctly from the terrestrial Adephaga, both biologically and in morphological characters; these characters are determined by their aquatic life. The body of the aquatic Adephaga has usually a streamlined form and a smooth surface; this reduces resistance during movement in the water; the parts of the body are closely fitted together and little movable; there is no constriction between prothorax and the other part of the body such as is usually present in beetles; all outlines and angles are smoothed out, and sculpture and hair cover are usually reduced. The eyes are not divided into two parts in some families; the elytra have a complete, independent subcosta; medial cell of wing closed; antennae regular, filiform, rarely spindle-shaped or slightly club-shaped (Dytiscidae and other related families); hind legs long and natatorial, forelegs short. Eyes are divided into an upper and a lower eye in one family. Elytra with a complex cubito-anal region, or their structure is simplified; antennae irregular, 11-segmented; mid- and hind legs very short, flattened, the natatorial forelegs long and prehensile in the Gyrinidae. Metathorax usually without suture before the hind coxae; this suture is sometimes only marked in the middle; if it extends almost over the whole width of the metathorax, the hind coxae are broadened into large femoral cover plates. Hind coxae fused with the metathorax; the natatorial hind legs can therefore move only in the horizontal plane. The center of gravity of the body of aquatic beetles is situated very low because of the air space beneath the elytra; this space contains a reserve of air; the body is there- fore very stable during movement. Key to Families of Aquatic Adephaga A. Imago 1(10). Eyes normal. (7). Metathorax with transverse suture (Figure 1) before hind coxae. 3 (4). Transverse suture extending the whole width of the metathorax, separating a broad precoxal part which tapers into a blunt triangular process between the hind coxae (I. Series Caraboidea). 4 (3). Transverse suture on metathorax short, present only in the middle, or absent (II. Series Dytiscoidea). 18 FIGURE 1. Ventral side (without head and prothorax): a — Carabidae; b — Hygrobiidae; c — Haliplidae; d — Dytiscidae; t.s — transverse suture of metathorax. 5 (6). В (5) @ (2), 8 (9). Fore coxae spherical, their cavities open. Legs of walking type о ssh oa oy veoh St SAaso Senco MeL cata Family Amphizoidae Fore coxae conical; their cavities closed. Mid- and hind legs natatorial, tibiae and tarsi with long hairs ... Family Hygrobiidae Transverse suture onmetathorax absent (Figure 1) or replaced by a short row of dots. Hind coxae broadened. Hind coxae covering at least half the abdomen. Antennae 11-segmented, but apparently 10-segmented ... Family Haliplidae Hind coxae not covering abdominal sternites. Antennae distinctly BESS PMEMCC Given и о ео Family Dytiscidae Eyes divided by margin of clypeus into an upper and a lower half. Forelegs prehensile, longer than the flattened mid- and hind legs ИГ. Series, Gyrinoideay о Family Gyrinidae B. Larvae 1(10). со — = es co O —— Labium not divided into a pair of тах Шае, as the prementum is not longitudinally divided into two separate stipites. Abdominal segment 10 usually without broad hooks. Abdominal segment 9 present. Tarsi with one claw. Legs usually short, sometimes absent. Legs 6-segmented (tarsus one-seg- mented, with an articulated claw); labrum absent .... Haliplidae Abdominal segment 9 rudimentary, long and conical; segment 8 is the last segment. Two claws on the tarsi. Head hypognathous, without cervical constriction. Mandibles sickle- shaped, simple. Ventral side of thoracic and abdominal segments with paired gill processes. Mature larvae with 7 pairs of ab- dominal эрвае ее Hygrobiidae Head prognathous. Mandibles not simple. Mature larvae with 8 pairs of abdominal spiracles, 8th pair situated at the end of the abdomen. Inner margin of mandibles without groove or canal .......... СИ ar О Ил Dytiscidae (Noterinae) Inner margin of mandibles with a groove or canal. Gula present, almost square or triangular. Gular suture double ог bifurcate anteriorly. Pronotumbroad, almost square ........ нЕ Dytiscidae (other subfamilies) 19 9 (8). 10 (1). Gula absent. Gular suture median, simple. Pronotum transverse, EITM By le URNS) Gila (oN ao td) Оооо Зоне О aceon) ols Amphizoidae Labium divided into two second maxillae, their cardo fused, but stipites free. Abdomen with 10 segments; last abdominal segment with 4 hooks at the end; other abdominal segments with paired tracheal gills at the sides. Mandibles with a canal; tarsi with D Sane SS Oe а а о a0 70 On ono Gyrinidae 17 РИ ЗЕ Л Л ОНР А ЕАМ GAUGES 2 ОТТО Е DIAGNOSIS OF FAMILY Antennae short, 1l-segmented, bare. Galea simple. Mentum reaching end of labral plate. Fore coxae spherical, their cavities open. Only a short indistinct line (suture) on the metathorax, before the hind coxae. All tibiae and tarsi not natatorial, without natatorial hairs. Abdomen 8-seg- mented, with weakly developed spiracles; only last tergite with a pair of normal spiracles; 6 abdominal sternites. Larva of caraboid type. SYSTEMATIC POSITION OF THE FAMILY, ITS ORIGIN AND DISTRIBUTION Lacordaire (1854) first noticed the special systematic position of the genus Amphizoa Lec. He separated it as a special group (Amphizoides) of the family Dytiscidae. Horn (1881—1882) and Leconte and Horn (1883) separated the genus as a family closely related to the family Dytiscidae on the basis of a number of characters which distinguish it both from the Dytiscidae and from the Carabidae. Sharp (1882) made a detailed study of the morphological characters of the Amphizoidae; he stated that the following characters place this family close to the Carabidae: the walking (not natatorial) legs; the rounded (not flattened) tarsal segments; the reduced suture on the posterior part of the metathorax; however, Sharp thought that the Amphizoidae are more closely related to the Dytiscidae, because of the absence of pubescence on the antennae and other characters connected with their aquatic life. Sharp, therefore, did not find sufficient reasons to separate Amphizoa from the Dytiscidae. This view was not accepted later (Fowler, 1887; Régimbart, 1895; Yakobson, 1908; Chatanay, 1910, etc. ); the family Amphizoidae is at present generally recognized. No fossils of this family have been found. However,in view of the recent distribution of the family, it may be assumed that it represents an ancient relict group which branched, together with the Hygrobiidae and Carabidae, from the common stock of the Adephaga. This family consists at present of only one genus with three species. 21 MORPHOLOGICAL REVIEW Body moderately convex, oblong, black, 10-—13mm long; dorsal side with dense, coarse dots. Head short, broad, narrower than pronotum. Eyes small, slightly convex, slightly projecting laterally; clypeus separated from frons its whole length by a narrow suture; mentum large, reaching anterior margin of labrum, covering greater part of mandibles. Antennae 11l-seg- mented, short and bare; first three segments with dots or pores; other segments not distinctly punctate and shining. Pronotum much narrower than elytra, short, flat; its lateral margins with or without coarse irregular denticles. Prothorax flattened; it forms a flat process posteriorly, between the widely separated coxae, which is slightly rounded at the end. Meta- thorax projecting anteriorly between the mid coxae in form of a broad process which is contiguous with the process of the prothorax. Hind coxae large, occupying half the metathorax; their inner lobes closely contiguous; a suture in form ofa short, slightly undulate line more or less distinct in the middle of the metathorax, before the hind coxae. Six abdominal sternites; first three sternites fused, but the sutures between all sternites distinct. Epipleura well developed, broad at the base, tapering toward the first sternite; they are very narrow at the level of the other sternites and disappear near the beginning of the anal sternite. Legs long, slender, without hairs or setae; only mid tibiae with a row of setae in an apical depression. All tibiae with two short, terminal, almost equal spurs. Secondary sexual characters not described. BIOLOGY AND ECOLOGY Larva (described only for A.lecontei Matth.) brownish, with a few small dark spots on the head and the sides of the segments. Body flat, spindle-shaped, broad anteriorly, with a few short hairs. Eight abdominal segments; abdominal segment 8 markedly longer than segment 7, witha short terminal appendage. Cerci markedly shorter than last segment. Antennae 4-segmented; segment 4 small, with a small lateral appendage. Larvae and adults live at the bottom of freshwater bodies, among stones or pieces of wood. The beetles are unable to swim and crawl on the substrate. The type of feeding is not known (they are probably predacious). We also do not know their method of respiration (spiracles rudimentary and tracheal gills absent); the beetles do not rise to the surface of the water. 1. Genus Amphizoa Lec. Leconte, 1853, Proc. Acad. Nat. Philad., VI:227; Sharp, 1882, On aquat. carniv. Col. :318, 844, 974; Leconte and Horn, 1883, Class. Col. М. Amer. :59. Type species: Amphizoa insolens Lec. Description: same as for the family. Three species: one in Central Asia, and the other two in North America (California and Vancouver). 19 22 1. Amphizoa davidi Lucas Lucas, 1882, Bull. Soc. Entom. Fr. (6)2:157; Régimbart, 1899, Ann. Soc. Entom. Fr., LXVIII:192. "Black, mat. Head finely and densely punctate; antennae reddish brown, shining. Pronotum more finely punctate than in A.insolens Lec. (Figure 2), without longitudinal median groove, smooth laterally; sides with hardly marked rim, without denticles. Scutellum delicately shagreened. Elytra narrower than in A.insolens, with finer and denser punctation; longitudinal rows of grooves hardly marked, without dots. Venter black, shining, with more delicate and denser punctation; tarsi reddish brown, with delicate dots dorsally. The species differs from A.insolens in its narrower body, in the finer and denser punctation of the narrower elytra, and in the presence of longitudinal grooves without dots. Length 11mm" (after Régimbart). Distribution. Described from China (Szechwan, Paohing, former Muping). FAMILY HYGROBIIDAE DIAGNOSIS OF FAMILY Е Si aaa” pia Antennae 11-segmented, situated at the sides of the frons. Clypeus narrow anteriorly. Pronotum strongly convex; metathorax strongly developed, its processes four-lobed; hind coxae transverse, broad, reaching lateral margin. Abdomen with 6 free sternites; first 3 sternites fused, but sutures distinct. Penis symmetrical. SYSTEMATIC POSITION The family Hygrobiidae was at first included in the Dytiscidae as а tribe (Pelobiini — Erichson, 1837; Seidlitz, 1887; Hygrobiinae — Régimbart, 1878). Horn (1881) separated it as an independent family, describing a number of characters which distinguish it from the Dytiscidae, mainly in the structure of the metathorax. The metathorax bears a broad posterior, almost rectangular process before the coxae, whichis separated by a distinct suture from the other part of the metathorax; the Dytiscidae do not have even a trace of this suture. The head of the Hygrobiidae is not retracted into the pronotum, the hind tarsi are not broadened anteriorly, andthe legs are adapted for crawling (the hind legs move alternately); this places the Hygrobiidae close to the Cara- bidae. The status of the family was recognized by Ganglbauer, 1892; Yakobson, 1906; Reitter, 1908; Csiki, 1946; Guignot, 1947, and others. 20 23 MORPHOLOGICAL REVIEW Body broad (Figure 3), strongly convex. Head free, not retractile into pronotum, with strongly convex, rounded eyes. Clypeus slightly tapering anteriorly, separated from the frons by a more or less marked suture. Antennae 11-segmented, filiform, bare; first segment thicker than the others. Labrum broad and short, with a broad anterior indentation. Mandibles short and broad, asymmetrical, bidentate apically. Galea of maxillae two-seg- mented; lacinia curved toward the broad vertex; maxillary palps 4-seg- mented; first segment short, segments 2 and 3 of equal length; segment 4 slightly longer and more slender than 3rd, slightly curved and truncate apically. Mentum short and narrow. Labium also short; labial palps 3-seg- mented; first segment small, narrowly conical; second segment twice as long and thick as the first. Pronotum large, massive, closely fitted to the elytra; its anterior margin concave, with a dense fringe of setae; posterior margin more or less concave in the middle posteriorly, leaving the triangular scutellum completely exposed in the European species; the scutellum is covered inits greater part in other species. Scutellum more or less developed. Elytra ovoid; epipleura of elytra broad to the hind coxae, tapering further posteriorly. Surface almost completely bare, with distinct sculpture consisting n — prothorax; с — mesothorax; 3 — meta- of irregular dots which almost form rugae. thorax; 3m — hind coxae; sy~s,— abdominal Wings present; their venation resembles rare that of Dytiscidae in general. Prothorax strongly convex, almost vertical anteriorly, forming a long posterior process with a lateral margin and with blunt apex; this process ends between the mid coxae. Mesothorax very short, vertical anteriorly. Fore and mid coxae conical; hind coxae transverse, reaching lateral margin of body; they completely separate the first abdominal sternite from metathorax and episterna; they are prolonged posteriorly into a process. Metathorax short, broad, reaching the epipleura. Legs long, slender, not typically natatorial; tibiae flattened, their upper and lower margin covered with long natatorial hairs. Both spurs on the fore tibiae strongly developed; one of them at apex of tibia, the other slightly subapical. Tarsi 5-segmented; segments 1 and 5 long; segment 4 of fore and mid tarsi small. Fore and mid tarsi strong, with a row of long hairs on the first segments on the outer side; hind tarsi long and slender, slightly flattened, eovered with long hairs dorsally and ventrally. Claws thin, moderately long. First three segments of fore and mid tarsi of males slightly broadened in form of a heart; their ventral side with a brush of brownish-yellow hairs; claws more strongly curved than in the female. FIGURE 3. Hygrobia tarda Hrbst.: 21 24 Abdomen with 8 tergites and 6 sternites; first 3 sternites fused, sutures indistinct in the middle. Spiracles of first tergite very large, transverse; following spiracles rounded, gradually decreasing in size. A longitudinal, transversely-striated ridge оп the ventral side of the elytra, in the distal third, near the suture, opposite the pointed posterior margin of the anal sternite; this ridge is a stridulatory apparatus which produces a strong rattling sound. Male genitalia resembling those of Dytiscidae; penis and parameres symmetrical; opening of penis dorsal. BIOLOGY The larva (Figure 4) is known only for the European species; its spindle-shaped, slightly humpbacked body is very characteristic. The larva is markedly convex; it has a long spindle-shaped process at the posterior end of the body; the larva is yellow on head and dorsum, with a brown pattern. Head without neck, very large, slightly narrower than prothorax, inclined ventrally. Frons slightly projecting in the middle, and depressed at the sides, before the eyes; clypeus truncate. Six oblong, slightly projecting stemmata. Antennae ‘lateral, filiform, about a third as long as head; segment 2 twice as long as first, 3rd segment ea as long as 2nd segment and markedly thinner; its apex with 2 small, thin, conical segments which represent the 4th segment and an accessory segment; accessory segment much smaller than segment 4. Mouth open (as in Noterini); mandibles long, narrow, with a denticle near the apex on the inner margin. Stipes \ twice as long as broad; galea and lacinia г. |. absent. Maxillary palps thin; 2nd segment 1.25 times as long as 1st; 3rd segment 1.33 times as long as 2nd, pointed. Labial palps as long as maxillary palps. Prono- FICURE AL О et aac Hees Tu 33 times as broad as long at the Pee ee base and slightly broader than head, strongly convex dorsally; broadly rounded at the sides and the anterior margin. Meso- and metathorax half as long as prothorax, three times as broad as long. Abdomen very convex dorsally and flat ventrally, as long as head and thorax together to the base of the style. First abdominal sternites very short; following sternites becoming gradually longer. Styliform appendage of the conical 8th segment as long as the abdomen; this appendage and the mobile, long, slender, slightly shorter, one-segmented cerci, which are 22 25 slightly raised upward, bear short setae and projecting hairs. Small rounded spiracles present; one pair on the mesothorax and one pair on each of the first 7 abdominal tergites. Filiform gills situated at the base of the coxae, on the first three abdominal sternites. Legs flattened and long; femora strong; tibiae and tarsi thinner; claws thin, of equal length. Pupa. As in the Dytiscidae, it has two strong cerci; spiracles situated between abdominal sternites and the pleura; abdominal tergites with a keel in the midline; first 6 tergites with spiracles. The females lay rows of eggs on submerged stalks of plants. The mature larvae come out of the water and pupate on the bank, in the surface layer of the soil, at a depth of 5cm or more. One generation per year. The beetles hibernate in mud at the bottom of the water. ECOLOGY AND GEOGRAPHICAL DISTRIBUTION Adults and larvae live in marshy puddles and in small ponds with dense vegetation. The beetles swim rapidly by alternating movements of the hind legs. They feed on Oligochaetes and small Crustacea. They occur in the plains, rarely in the mountains; they have been recorded at altitudes to 2,000 m. The family contains only one genus with 4 species, one in Central and Southern Europe, one in China and 2 in Australia. This family should there- fore be considered as an ancient relict which is becoming extinct. Bibliography Yakobson,G. Zhuki Rossii i Zapadnoi Evropy (Coleoptera of Russia and Western Europe), No.3:180. 1905. Csiki, Е. Die Kaferfauna des Karpathen-Beckens, р. 547. 1946. Ganglbauer,L. Die Kafer von Mitteleuropa, I. :434. 1892. Guignot, Е. Coleopteres hydrocanthares.— In: Faune de France, Vol 48:53... 1941. Ве! Тег, Е. Fauna Germanica Kafer, 1:275. 1908. 1. Genus Hygrobia Latr. Latreille, 1804, Nouv. Diction. Hist. nat., XXIV:139; Ganglbauer, 1892:437; Guignot, 1947:53.— Paellobius Schonherr, 1808, Syn. ins., П:27.— Pelobius Erichson, 1832, Sen. Dytisc.:19. Type species: Dytiscus hermanni F, See description of the family for description of genus. 23 *1. Hygrobia tarda (Herbst.) (Figure 5) Herbst, 1779, Schr. naturf. Ges. Berlin, IV:318 (Dytiscus); Gangl- bauer, 1892:438; Reitter, 1908:205.— hermanni Olivier, 1795, Entom., 11:25 (Fabricius); Zimmermann, 1917 (1919), Arch. Naturgesch., 83:107; Csiki, 1946:550; ab. circumflua Everts, 1922, Col. Neerl., III:47; Guignot, 1947:53; ab. conjuncta Everts, Guignot, 1947, ibid.:54. Reddish or slightly brownish; antennae, palps and legs lighter; a spot on inner margin of eyes, anterior and posterior margin of pronotum, scutellum and a large spot on dorsum of elytra with serrated margin, all black. The FIGURE 5. Hygrobia tarda (Herbst.) greater part of the pronotum is sometimes dark (Ab. circumflua Ev.); the elytra are sometimes also almost completely black (ab. conjuncta Ev.). Venter black; sides of prothorax, epipleura, first sternites and apex of last sternite and process of prothorax reddish brown. Head shining, covered with dense, fine dots; clypeus with projecting anterior corners. Pronotum transverse, slightly narrowing anteriorly, 2.5 times as broad at the base as long, with rounded corners and a weakly marked rim; at the sides near the anterior margin and near the base it is covered with dense rugae and with fine, scattered dots in the middle. Scutellum completely exposed, smooth. Elytra with several weak depressions, mat, covered with dense coarse irregular кирае. lengthyG.o— lO mam: Distribution. USSR: only in the western Ukraine. Central, Western and southern Europe, North Africa. FAMILY HALIPLIDAE DIAGNOSIS OF FAMILY Small (at most 5mm). Antennae 11 -segmented, filiform, bare, situated at the anterior margin of the frons between the eyes. Maxillary palps 4-segmented; labial palps 3-segmented. Elytra with primary and secon- dary rows of dots. Prothorax convex, with a large posterior process. Metathorax without transverse suture before the hind coxae; it has instead a small transverse row of dots in the middle. Fore and mid coxae spherical; hind coxae broadened into large plates which are contiguous in the middle; they reach at least the base of the epipleura and cover the first abdominal sternites, the trochanters and the base of the hind femora. Six abdominal sternites; first 3 sternites fused. Penis asymmetrical; ‚ both parameres usually of different form. Larva. Head hypognathous, with 6 ocelli on each side. Mandibles broad, with a suction canal on the inner side, which opens before the apex. Abdomen 9- to 10-segmented. Legs not natatorial; tarsi with only one claw. 24 27 MORPHOLOGICAL REVIEW Body convex, short or slightly oblong, sometimes ovoid; coloration usually more or less reddish to light yellow, often with black lines and spots; surface almost always bare, without hairs; dorsum covered with hairs only in the South African genus Algophilus. Head small, with convex, rounded eyes; head hardly narrowed behind the eyes; clypeus not separated or indistinctly separated from the frons; its sides slightly cover the base of the antennae. Antennae situated at anterior margin of frons between the eyes, 11-segmented (apparently 10-segmented), filiform, bare; first segment slightly thickened at the base. Labrum transverse, with dense cilia on the truncate or blunt anterior margin. Mandibles short and broad, bidentate apically; middle of inner margin with one denticle. Galea two-segmented; lacinia twisted toward the pointed apex, with cilia at the margin. Maxillary palps 4-segmented; labial palps 3-segmented. Mentum more or less distinct, small, transverse, witha deep indentation anteriorly; a median denticle in the indentation. Pronotum almost rectangular (Brychius) or trapezoidal (Haliplus); its anterior angles enclose the head; its base contiguous with the base of the elytra; it has a posterior angular process which covers the scutellum completely; anterior margin indented. Elytra short oval or oblong-oval, more or less strongly convex, pointed posteriorly, with 10 longitudinal primary rows of dots (except in Algophilus), and with 11 more or less regular secondary rows; spaces between rows either smooth or more or less distinctly finely punctate, shagreened (in females). Epipleura very broad from base to apex of plates of hind coxae. Prothorax projecting posteriorly beyond the fore coxae, with a broad process at the end; epipleura not reaching this process, and the anterior coxal cavities are therefore open; both the fore and mid coxae spherical. Mesothorax completely covered by the process of the prothorax which is contiguous with the intercoxal process of the metathorax at the inner margin; epimera reaching cavities of mid coxae. Metathorax large and broad, slightly narrowed anteriorly; it extends laterally markedly above the mid coxae; it projects in the form of an angle in the middle between the hind coxae; process of metathorax between the mid coxae markedly broader than pro- thorax between the fore coxae; hind coxae forming large plates which are contiguous in the middle; they reach, at least at the base, to the epipleura of the elytra and completely cover the first 3—5 abdominal sternites, the hind coxae and the base of the femora. Transverse suture of metathorax in form of a row of dots extending the whole width of the metathorax; episterna tapering posteriorly, separated from the mid coxal cavities by the broad lateral wing of the metathorax. Wings always present; venation of the caraboid type, which is closely related to that of Dytiscidae; costa and subcosta separated at the base; anal vein weakly developed; anal cell open. Ten pairs of spiracles on tergites and on meso- and metathorax. Abdomen with 8 tergites and 6 sternites; first 3—5 sternites covered by the hind coxae, fused and with a broad cavity which ensures free movement of the hind femora. Fore and mid femora broadly cylindrical; hind femora markedly thickened at the base, thin in the middle and again thickened in the form of a flask at the apex. Fore and mid tibiae and all tarsi with sparse natatorial 25 28 hairs. Tarsi 5-segmented, slender. First 2 segments of males (Brychi- us and Peltodytes) or the first 3 segments (Haliplus) of fore and mid tarsi slightly broadened and covered with adhesive hairs on the ventral side. Length 1.8—5 а. Male genitalia. Genitalia more or less asymmetrical in all species; the form of the penis and especially of the parameres is constant in each species and is a good diagnostic character. The penis is crescent-shaped and flattened laterally; both sclerites of the penis of different size: left sclerite larger; slit between the sclerites displaced to the right, at least for part of its length. There is usually an operculum in the form of a long ligula on the dorsal side above the ejaculatory duct. The upper wall of the duct often forms a soft hoodlike process which is more or less folded. Parameres markedly asymmetrical; right paramere (as correctly designated by Falkenstrém, Kinel and Guignot) or left paramere (according to terminology of Netolitzky, Brown and Zimmermann) usually larger and more strongly differentiated, always more or less triangular; its outer side convex and its inner side concave. Left paramere always convex dorsally, usually concave on the inner margin. Both parameres, especially the right, usually covered with hairs in form of a fringe (mainly on the ventral margin); these hairs form а fascicle at the apex. Female genitalia simple, with two plates on either side. BIOLOGICAL AND ECOLOGICAL REVIEW The metamorphosis of the Haliplidae has been little studied (Falken- strom, Lindberg, Guignot) and only for a few species. Copulation takes place usually in spring (but it has also been observed in summer and autumn); the females deposit the eggs while the aquatic vegetation grows; this may take place in spring and late summer. Females of Haliplus lay a white egg (0.3—0.5 mm) into a plant either by piercing it with the ovipositor or by gnawing a hole into it. The eggs are laid into various plants, mainly filamentous algae, Chara and Fontinales. Females of H.ruficollis have been recorded to lay eggs in the stalks of Juncus and Phragmites. A female lays 30—40 eggs throughout life. Embryonal development lasts 8—12 days. The larva passes three larval stages. The lateral spiracles appear only in the last stage. Females of Peltodytes scatter their brown eggs on aquatic plants (Elodea, Ceratophyllum). Development of the larva is not completed in the same year; larvae of different stages, mainly of the 2nd and 3rd stage usually come out of the water in autum, hibernate in the humid soil on the bank and return to the water in spring; the larvae rarely hibernate in the water. Hibernation of the larvae may be repeated; thus, they remained in hibernation as long as three years under experimental conditions. The larva comes out of the water for pupation and digs a shallow pit in the soil (to 3cm deep). Pupation lasts 12—14 days. There is also the observation (but less exact) that development of one generation lasts one year and that the adults hibernate under the ice, burying themselves in the mud at the bottom, 26 29 Larva with 6 stemmata оп each side; antennae of last stage 4-seg- mented; last antennal segment with a long seta, almost three times as long as the segment; an additional, shorter and narrower, bare, ventral segment is contiguous with this segment. Abdomen with 9—10 segments and two unsegmented cerci. A pair of spiracles on the mesothorax and one pair of the first 7—8 abdominal segments; spiracles situated on tubercles at the sides; posterior pair of spiracles more or less rudimentary; last two segments without spiracles. Legs with one tarsus, without empodium, of different length; forelegs much shorter and adapted for grasping (see below). Pupa. Integument soft, not sclerotized, with thin setae situated on tubercles. Nutrition. The Haliplidae have been considered as predacious in the past, like the Dytiscidae. It has been established only recently that probably all the Haliplidae (both adults and larvae) are phytophagous, feeding mainly on green algae (Conferva, Cladophora, Ulothrix, Entomotropha, Spirogyra, Chara, Nitella) and rarely on Fon- tinales. In the aquarium, they feed on Lemna, Callitriche, Phrag- mites. If vegetable food is absent or if starved, they sometimes feed on animals (live and dead worms, larvae of insects, Asellus aquaticus); however, the larvae do not complete their metamorphosis in this case and die sooner or later. They can stand starvation for a long time (to 45 days in distilled water). Respiration. Unlike the Dytiscidae which rise to the water surface to breathe and store air under the elytra, Haliplidae do this only rarely; they usually receive oxygen by gas exchange in the water; this takes place by diffusion of oxygen dissolved in the water in the air bubbles in the coxal space (between hind coxae and body). Expiration of СО2 probably takes place in the same way. Respiration of the larvae cutaneous (Brychius, Haliplus) or tracheo-branchial (Peltodytes). Movement. Although the legs of Haliplidae have a few natatorial hairs, they are poor swimmers; they usually remain among the vegetation, on which they crawl slowly. When they swim, the hind legs move alternately. They are capable of flying from one water body toanother; however, this is apparently rare andtakes place only at night. The larvae only crawl on plants. Habitats. They live in water bodies of diverse types, but they show some specialization; they prefer rapidly flowing brooks (Brychius); others occur only in streams with a slow current (some species of Hali- plus); others remain near the banks of open water or slightly overgrown water bodies (lakes, ponds — Peltodytes,Haliplus); they occur rarely in small ponds and puddles which are densely overgrown. Certain species occur in brackish water in puddles on the seashore (Haliplus imma- culatus) or in brackish lakes; however, no true halophile forms have been found so far among them. SYSTEMATIC POSITION, EVOLUTION AND DISTRIBUTION OF THE FAMILY The family Haliplidae was at first included in the Dytiscidae. It was separated as an independent family by Kirby (1837). It was again included 27 30 in the Dytiscidae by Seidlitz (1887) as a subfamily (together with the sub- family Pelobiinae); however, this classification has not been accepted. They resemble the Dytiscidae in the compact shape of the body, the bare antennae and the long prothorax; however, the Haliplidae differ from the Dytiscidae in the position of the antennae, the transverse row of dots on the metathorax before the hind coxae, the very characteristic structure of the hind coxae and hind femora, the structure of the male genitalia, and other characters. The genus Peltodytes is apparently the most primitive, and the genera Brychius and Haliplus have a common origin. The species of the family are especially numerous in America, which is apparently the center of the origin of the family (Canadian Shield); this seems probable because the most primitive forms (Peltodytes, Brychius and some species of Haliplus) occur in America; in Europe and part of Asia occurs mainly the subgenus Liaphlus, which is more progressive and certainly more recent. Fossils of Haliplidae are not known. GEOGRAPHICAL DISTRIBUTION The family Haliplidae consists of 4 genera. Algophilus Zimm. occurs only in South Africa (Cape Province); the other 3 genera are cosmopolitan, but predominate in North and partly South America. There are 140 species; 46 species are Palearctic. Thirty one species occur in the USSR. How- ever, further study will probably increase this number. According to their distribution, the 31 species in the USSR form the following groups: 1. Species which are widely distributed in the Palearctic Region; Europe, Siberia (except the Far East), Kazakhstan, part of Mongolia, Transcaucasia, Southwest Asia, North Africa— Haliplus obliquus Fabr., H.fulvus Habra Е. Там omnis stugm iE ов со Desert andslersien ides Wehncke (5). 2. Species characteristic for the tundra, which do not extend far into the taiga — Haliplus apicalis Thoms., H.samojedorum Sahlb., H.transversus Thoms., H.sibiricus Motsch., H.lapponum Thoms. and Br.cristatus Sahlb. (6). The last species of this list occurs further south in the taiga (in the north and center of the European USSR); it forms a subspecies (rossicus Sem.) which connects it with the Central European species BS cjebenatuise Рав» 3. The taiga species (northern Eurasia) extending in some places into the zone of the insular forests (USSR and north of Central Europe) — Hali- plus confinis Steph., H.varius Nic. and H.immaculatus Gerh. (3). 4. Species of the zone of insular forests (Central Europe) — Br.elevatus Panz,, Hifulvicollis Er., Е. furicatuis, seid. Het laukvy last ivais Awe. H.lineolatus Mnnh. and H.laminatus Schall. (6). 5. Species of the steppe — Haliplus maculatus Motsch., which is restricted in the steppes of Eurasia to Poland and Hungary in the west. 5917 28 31 6. Species of Mediterranean origin— Peltodytes caesus Duft., Haliplus lineaticollis Mrsh. and H.variegatus Sturm. (3). The last species extends deep into Central Europe and occurs in the south of the European USSR and in Turkmenia. 7. Species of Chinese-Japanese origin (Palearchearctic) — Peltodytes intermedius Sharp, Haliplus hummeli Falk., H.basinotatus Zimm. and H.simplex Cl. (4), which were found in the USSR in the Maritime Territory. Additional species, especially of the subgenus Liaph- lus (which is so richly represented in China and Japan) will probably be found in this region. 8. A species which is not rare in Canada and in the west of the U.S.A. and extends into Russia in Kamchatka — Haliplus robertsi Zimm. 9. There are two little known species, the distribution and specific status of which are not clear: Haliplus schaumi Solsky (described from Michurinsk), and H.interjectus Lindb. (described from Vyborg). Bibliography Yakobson,G.G. Zhuki Rossii i Zapadnoi Evropy (Beetles of Russia and Western Europe), No.6:412. 1908. Zaitsev, Е. Vodnye zhuki у faune Gruzii (Aquatic Beetles of the Fauna of Georgia). — Trudy Zoologicheskogo Instituta Akademii Nauk Gruzinskoi SSR Мот: 8 —1251952% Bertrand,H. Les larves et nymphes des Dytiscides, Hygrobiides et Haliplides. = Encyel) ents; Voli10:213=245, 295—300, Paris, 1928. Bertrand,H. Captures et élevages de larves de Coléoptéres aqua- tiques.— Bull. Soc. ent. Fr., 55(3):42—48. 1950. Csiki, Е. Die Kaferfauna des Karpathen-Beckens, р. 551. 1946. Edwards, J. Revision of British Species of Haliplus.— Ent. Mag., Ку: №022: 1911. Falkenstrom,G. Stockholmstraktens Vatten-Coleoptera.— Ent. Tidskr., Volks (2230. CLO S16: Ganglbauer,L. Die Kafer von Mitteleuropa, Vol. 1:422. 1892. Geschwendtner, L. Beitrage zur Kenntnis und Bestimmung palaark- tischer Schwimmkafer.— Ent. Anz., 1(5):56. 1921. Guignot, К. Faune de France. 48. Coléoptéres hydrocanthares, p.33. 1947. Kinel, J. Kilka sftow о Flisakowatych ziem polskich.— Archwm. Tow. nauk Lwow, 3, 2(2):23. 1922. Kinel,J. Einige Bemerkungen zur Bestimmungstabelle, 97 Heft. Haliplidae.— Polskie Pismo ent., Vol. 8:217. 1929. Lindberg, H. Finnlands Haliplus-arter och derens utbredning inom Fenno-Skandia orientalis.— Acta Soc. Fauna Flora fenn., Vol. 60:478. OS. Régimbart,M. Revision des Dytiscides de la région indo-sinomalaise. — Annls Soc. ent. Fr., Vol. 68:187. 1899. Rienttemih. Kauna 'Germanica. — Kafer, Vol! 12201.) 1908; Rousseau, Е. Contribution а l'étude des larves d'Haliplides.— Archs. Biol. lac., 9(4):269—278. 1920. 29 32 Scholz, В. Haliplidae.— In: Reitters Bestimm. — Walon, Voll, 9). 19. Seidlitz,G. Bestimmungstabellen der Dytisciden und Gyriniden des europaischen Faunengebietes.— Verh. naturf. Ver. Brunn, Vol. 26: 1—8, 187. Zimmermann,A. Dytiscidae, Haliplidae, Hygrobiidae, Amphizoidae. — In: Coleopterorum Catalogus, Junk-Schenkling, Part 71, p.297. 1920. Zimmermann, A. Die Halipliden der Welt.— Ent. Bl. Biol. Syst. акек» о 208 652 Oem 99а Key to Genera 1 (2). Last segment of palps longer than penultimate segment, and as broad аз this. Elytra with thin presutural line in the posterior half. Pronotum without lateral lines. Hind coxae with a rim, reaching base of last abdominal sternite; their lateral margin parallel to the epi- pleura, covering their inner margin. Larvae with 9 abdominal ева ет a enia ei vahiay alee eue ed Mra ea olttoncls 1. Peltodytes Rég. 2 (1). Last segments of palps short, conical or needle-shaped, narrower than penultimate segment. Elytra without presutural line. Hind coxae without rim, reaching only to posterior margin of abdominal sternite 3; their lateral margin diverging from the inner margin of the epipleura. Larvae with 10 abdominal segments. 3 (4). Pronotum flat; its sides almost parallel in the posterior part; lateral margin with a thin groove. Last abdominal sternite with apical longitudinal groove. Spurs of mid and hind tibiae simple. Claws of all tarsi long; almost as long as the 2nd segment of hind tarsi. Third tinterval\of ей ука оау Derdistimc ука еее еее О Е Я Ва оао АСУ № ООН 2. Brychius Thoms. 4 (3). Pronotum almost always convex; its sides tapering from the base anteriorly; longitudinal line at the sides present or absent. Last sternite without groove. Spurs of mid and hind tibiae with a dense comb of short spinules near the base. Claws shorter; half as long as second segment of the hind tarsi. Intervals of elytra not raised Pee TOR EO COAT! CM оо С Пе EO os 3. Haliplus Latr. 1 (2). Abdomen 9-segmented. Cerci situated on dorsal surface and directed upward. Tracheal gills present... Peltodytes caesus Duft. 2 (1). Abdomen 10-segmented. Cerci situated at end of body, lying in plane of body. Tracheal gills absent. 3 (4). Head transverse. Third antennal segment slightly longer than 2nd. Inner margin of mandibles with spinules at the base .......... ое ОМ VT CREED, В Bae Nc eh eee ate Brychius elevatus Panz. 4 (3). Head rounded. Third antennal segment 2.5 times longer than 2nd. Mandiblesiwathouitys е в gin. tie mete Means sented ution romero) re Haliplus Lair. 30 ААВ А ВТ» Orly , ’ ve aan vay YO Oy er vw? у FIGURE 6. First abdominal tergite of larvae: a—Haliplus fulvus;b—H. flavicollis; c—H.variegatus; d—-H.amoenus; е —H.confinis; f-—Brychius elevatus; g—H.ruficollis; h—H. lineato- Collis, 33 All papillae at posterior margin of tergites similar, uniformly distributed, slightly projecting laterally or not projecting. (Subgenus Haliplus s.str.— Figure 6). Tergite 12 with 4 papillae. Denticle on inner margin of mandibles broad анал вое ва. о tee oles erie Feo H. obliquus Fabr. Tergite 12 with 2 papillae. Denticle of mandibles moderately large. Dorsal surface of tergites completely tuberculate, without bare ареала весов ие оО H. confinis Steph. Tubercles not covering background completely. Bare areas not covered with tubercles forming a sagittal line on the anterior tergites. Denticle of mandibles pointed. Tergites with parallel sides; papillae slightly projecting. Prothorax moderately broad. Most papillae on the tergites with А вре еее ва ет H. ruficollis Deg. Prothorax broad. Most papillae on the tergites with 6 spines ИО eH cuneen ene hate те Н. immaculatus Gerh. 31 34 14 (11). Tergites extended posteriorly. Dorsal papillae more projecting. 15 (16). Dorsal papillae slightly broadened anteriorly .. H. lineolatus Mnnh. 16 (15). Doxrsallpapillacimarkedly beoademed авео a haae crane a Aa aD A О OR Le, "OME o, ee) oF Bio) H. heydeni Wehncke. 17 (10). Bare areas on tergites forming several longitudinal rows. Denticle of mandilglesmoumt ое H. lineaticollis Mrsh. 18 (5). Papillae on tergites (at least on the posterior tergites) situated at different distances, or irregularly distributed, projecting laterally. (Subgenus Liaphlus-— Figure 6). 19 (20). Anterior tergites with 6 papillae of different size (inner papillae in! form Ofelowatuberc ев) eeu Ay mene iat H. mucronatus Steph. 19). Anterior tergites with 4 papillae. ). Dorsal papillae of different size; inner papillae much shorter ее Rete a dod Coe Ode H. variegatus Sturm. 22 (21). Dorsal papillae similar or almost similar. (24). Papillae slightly curved inwards. Inner margin of mandibles with a pointed denticler gta: 10.0. 1a chante eect ee nee H. fulvus (Fabr.). 24 (23). Dorsal papillae not curved or hardly curved inwards. Inner margin of mandibles without denticle. Inner papillae on last eNom He вм а\ ее А, в. Е H. flavicollis Sturm. 1. Genus Peltodytes Rég. Régimbart, 1878, Ann. Soc. Entom Fr. :457; Ganglbauer, 1892:432; Yakobson, 1907:413; Zimmermann, 1924:6; Scholz, 1929:7; Csiki, 1946:570; Guignot, 1947:34.— Cnemidotus Erichson, 1832, Gen. Dytis.:19; Reitter, 1908:204.- Type species: Dytiscus caesus Duft. This genus differs from Haliplus in the longer and larger last palp segment, the presence of a presutural groove on the posterior half of the elytra, and other characters. Body thickset, very convex, shining, bare. Head small; frons narrow; eyes large; antennae short; first 3 segments of maxillary palps short and thick; 4th segment half as long as 3rd, conical; last segment of labial palps slightly longer than penultimate segment, almost conical. Pronotum trapezoidal, markedly narrower anteriorly; it forms a posterior process in the middle of its base. Elytra with 10 primary rows of coarse dots which are often irregular and sometimes incomplete; secondary rows weak, consisting of almost uniform dots or of finer dots, or of indistinct dots. Presutural groove marked only in the posterior half. Hind tarsi shorter than hind tibiae; claws small. Hind coxae forming a large plate with a rim and covering the base of the penul- timate abdominal sternite; posterior margin projecting in an angle or with a denticle; rimmed lateral margin of coxae parallel to the epipleura or slightly covering their inner margin. First 4 segments of hind tarsi becoming gradually shorter; claws small. Male. Penis broad, short. Parameres distinctly different from those of the genus Haliplus, but almost of the same size; left paramere with broad triangular base; right paramere markedly narrower, unfformly broad its whole length; a fringe of hairs present only on the apical fifth, consisting of short, sparse hairs. 32 Larvae (Figure 7) described for P.caesus and two American species. They differ markedly from the larvae of Haliplus. Mature larva of P.caesus Slender, slightly tapering posteriorly, with mat surface; dorsum dark olive green; venter pale. Branchial filaments and cerci transparent at the apex. Head hexagonal, dilated on either side into a large, blunt, conical tubercle with the eyes at the apex; temples situated behind these tubercles, with three setiform tubercles; frons strongly convex lateral to the median groove. Clypeus separated from frons by a transverse depression, witha deep inden- tation in the middle. Antennae filiform, 4- segmented. Mandibles expanded on the outer side into a broad plate with rounded outer margin; apointed, curved denticle in the middle ofthe innermargin. Stipesas longas third antennal segment; galeahalfas longas width of stipes; galeaas wide as Stipes; whole galea covered with setae, witha club- shaped spine onthe dorsal side. First seg- ment of maxillary palps very short, ring- shaped, twice as broadas long; 2nd segment conical, half as broad as the first segment but twice as long. Labialpalps very short, halfas thick as the last segment of the maxil- lary palps; second segment 3 times as long as the very smallfirstsegment. Prothorax broader than long, with rounded anterior margin, strongly convex dorsally; meso- and metathorax and first abdominal seg- ments of almost equal width, but slightly shorter than prothorax; last abdominal seg - ments becoming gradually narrower; last segment conically prolonged toward base ofcerci. Abdomen9-segmented, last segment as long as the other part of the abdomen, with 2 long diverging many-segmented cerci; basal segment of cercitwice as long as last abdominal segment, notmovable. Spiracles present only on sides of mesothorax and first 7 abdominal segments. ‘Thoracic 35 segments and first 7 abdominal segments with 4 long processes; 8th seg- ment with 2 such processes;. each process with a long articulated branchial seta; thus, 21 branchial setae are present on each side; all branchial setae except the prothoracic setae longer than the segments, obliquely directed laterally and ventrally, and covered with a few spinelike tubercles. Last segment with one tubercle on each side, instead of a seta. Forelegs prehensile, half as long as hind legs; fore tibiae half as long as fore femora, inner corner with a finger-shaped process; process is about half as long as the tibiae; it has a serrated upper margin and a strong, short apical denticle. Tarsi with one claw with a denticle with an apical seta at the base. Length 5mm. Pupa. Flattened, with setae of different length situated on tubercles. Head with one seta on the frons behind the antennae and a 2nd seta on the vertex; 6 stemmata in one row on each side. Abdomen with 9 short seg- ments with a few setae. Length 3.5mm. FIGURE 7. Peltodytes caesus Duft. Larva. 33 36 Distribution. Cosmopolitan, except Australia and South America. The genus consists of about 30 species, only 4 of which occur in the Palearctic Region. Key to Species 1 (4). Posterior margin of hind coxae with a short broad denticle. Process of prothorax without depression. 2 (3). Vertex and whole head uniformly reddish yellow. Pronotum slightly tapering anteriorly, with a distinct depression at the base and with a transverse row of large dots of varying’ Size „не не CELT оао оО NLT RL MRR eh ee *1, Р. саезиз (Duft.). 3 (2). Vertex with 2 small black spots. Pronotum markedly narrowed anteriorly; base of pronotum slightly depressed; an oblique pit (consisting of 2 fused dots) and 3 small pits near the base on each RAS Hy LEGA RECO SEATS) SRE И i a oe 2. P. sinensis (Hope). 4 (1). Posterior margin of hind coxae prolonged into a more or less strong, skittle-shaped, pointed denticle. Process of prothorax with a marked depression in the middle, which is delimited by a sharp rim anteriorly and laterally. 5 (6). Antennae long, thin, segments longer than broad. Body oval, not very short. Pronotum with a weak transverse depression at the base or without a depression. Punctate rows finer. Fourth row of dots well marked, more or less widely interrupted in the middle of the anterior half. Prothorax raised before the fore coxae in form of a bulge (ааа Те а MAS GEO AEN *3. P.intermedius Sharp. 6 (5). Antennae shorter and thicker, segments 2—9 as long as broad. Body short, rounded-oval. Pronotum with a deep transverse depression at the base. Dots in the rows on the elytra very large, pit-shaped. Fourth row of dots marked only in the posterior half; it is either absent anteriorly, or consists of one or two dots near the base. In the subspecies conifer this row of dots is present also anteriorly and is interrupted only in the middle....... 4. P.rotundatus Aubé. *1. Peltodytes caesus (Duft.) (Figure 8) Duftschmid, 1805, Fn. Austr., 1:284 (Dytiscus); Ganglbauer, 1892:433; Zimmermann, 1924:7; Reitter, 1908:204; Scholz, 1929:7; Csiki, 1946:571; Guignot, 1947:36.— impressus Panzer, 1794, Fn. Germ.:7; subsp. levan- tinus Sahlberg, 1902, Oefv. Finsk. Vet. Soc. Foérh., 11:17; Scholz, 1929:7; Guignot, 1947:36. Oval, slightly oblong, strongly convex, shining, pale yellow (slightly greenish in life); vertex black; elytra with a dark spot on the suture immediately behind middle, with two diffuse, sometimes indistinct small spots on the disc, one anterior to the middle and one near the apex. Head with scattered dots. Pronotum little tapering anteriorly; a weak trans- verse depression near the base which contains a transverse row of large, irregular, blackish dots; these dots are smaller in the middle, sometimes 34 37 forming two rows; finer dots are near the anterior margin; disc smooth; anterior margin slightly dark. Elytra with a weak depression near the scutellum, with rounded shoulders, and with slightly irregular rows of blackish dots which are larger at the base and finer posteriorly and laterally; the rows converge at the base so that there are only 6 rows; the number of rows increases to 10 posteriorly because secondary rows of dots are present near the Базе; ` 4th row of dots well marked also in the anterior half; it is usually only slightly interrupted in the middle; 1st dot of each row markedly larger than the following; the dots are sometimes especially large and the first dot may be pit-shaped (subspecies levan- tinus Sahlb.). Presutural line absent in the anterior third. Process of prothorax behind the fore coxae almost triangular, without depression, but with slightly raised sides and with a pit apically; it bears 2 longitudinal rows of fine dots. Posterior margin of hind coxae forming a short, blunt angle lateral to the middle. Process of metathorax with a small, broad, more or less deep groove in the middle, near the anterior margin. Penis slightly curved, sharply narrowed apically. Right paramere (Figure 9) narrow, slightly curved, membranous apically, with a small fascicle of cilia; left paramere slightly broader, slightly triangular, also with membranous apex and a fascicle of cilia. Length 3.5-4mm. FIGURE 8. Peltodytes caesus Duft. FIGURE 9. Peltodytes caesus Duft. Parameres. Distribution. Central and southern belt of the European USSR, Transcaucasia, Middle Asia. Central and southern Europe, Mediterranean, ? Syria. 2. Peltodytes sinensis (Hope). Hope, 1845, Trans. Entom. Soc. London. IV:15 (Cnemidotus); Régimbart, 1899:192; Zimmermann, 1924:7; Falkenstrom, 1933. Ark. zool., ОУ, 1:2. \eliaievlod aS Clark, 1865) Ieamso IMO.) SOC, оао, (3), 1:417. Regular oval; vertex with two small, black, longitudinal spots. Elytra markedly broadened at the shoulders, strongly narrowed posteriorly, with 4 small, usually distinct black spots which are sometimes indistinct, one in the middle of the anterior half, 2 on the disc (in the middle of the elytra near the suture and in interval 6), and the fourth in the middle of the posterior half. Pronotum strongly narrowed anteriorly; the depression near the base is little marked; lateral to the middle, this depression contains a transverse pit (consisting of 2 fused dots), which is dark at the bottom, and 3 small dots. Elytra with rows of dots, which are regular to 2) of their length and more irregular in the posterior third; the dots are moderately large, becoming smaller apically; they are dark at the bottom. Posterior margin of hind coxae with a short, blunt denticle (which is more marked than in P.caesus). Hind femora reddish brown, especially at the base. This species differs from P.intermedius in the form of the denticle on the hind coxae, the more oblong body, etc. Length 3—4 mm. Distribution. Southern China, Taiwan, Vietnam. *3. Peltodytes intermedius Sharp. Sharp, 1873, Trans. Entom. Soc. London:55; Régimbart, 1899:191; Zimmermann, 1924:7.—dauricus Zimmermann, 1924:8. Oval, slightly oblong, slightly broadened at the shoulders; elytra with 4 distinct black spots situated as in P.sinensis, sometimes more or less reduced. Antennae long, slender, their segments longer than broad. Pro- notum strongly tapering anteriorly, with or without a weak transverse depression; a black, pit-shaped dot and several weaker dots on both sides of the depression; sides straight or slightly rounded; there is often a barely marked indentation near the blunt posterior corners. Fourth row of dots on the elytra more or less widely interrupted in the middle; its posterior part reaches only a little beyond the last third of the elytra. Prothorax steeply raised in a bulge before the fore coxae in side view. Dots in anterior half of epipleura and dots on pronotum usually more or less black at the bottom. Middle of hind coxae with a keel-shaped denticle which is shorter than in P.rotundatus. Hind femora usually dark. Length 3.5-—4mm. Distribution. USSR: southern Maritime Territory. Japan, China (Hankow, Peking). 4, Peltodytes rotundatus (Aubé) Aubé, 1843, Icon. Col., V:40 (Cnemidotus); Ganglbauer, 1892:433; Zimmermann, 1924:8; Scholz, 1929:8; Guignot, 1947:37; subsp. conifer Seidlitz:35; Zimmermann, 1924:8; Guignot, 1947:37. 36 38 Broadly oval, uniformly pale yellow, sometimes reddish yellow, rarely with traces of small dark spots; much shorter, broader and more rounded laterally than P.caesus. Pronotum with deep and broad transverse depression at the base with an irregular transverse row of two large (outer) dots and 3 or 4 smaller dots in the middle. Anterior half of elytra with large, almost pit-shaped black dots in rows; 4th row of dots in the anterior half either absent or represented by only 1 or 2 dots; it is well marked in the posterior half by a weak transverse swelling near the base. Posterior margin of hind coxae lateral to the middle with a strong, skittle- shaped denticle; hind femora reddish. Length 3.5mm. Penis less curved than in P.caesus, uniformly broad to the apex, where it narrows abruptly. Right paramere narrower in the middle than in P.caesus; otherwise as in P.caesus. Distribution. Mediterranean, common in France, Spain, Italy, North Africa. 4a. Peltodytes rotundatus conifer Seidl. Fourth row of dots onelytra marked also in the anterior half; the dots in the rows are less coarse than in the nominate subspecies, and the trans- verse depression near the base of the pronotum is less marked. Distribution. Greece, Turkey. 2. Genus Brychius Thoms. С. СЦ. Thomson, 1860, Skand. Col., 1:8; Ganglbauer, 1892:426; Yakobson, 1907:412; Reitter, 1908:201; Zimmermann, 1924:65; Scholz, 1929:6; Csiki, 1946:555; Guignot, 1947:37. Ecology. Lindberg, 1930, Not. entomol., X:123. Туре species: Dytiscus elevatus Panz. This genus differs from Haliplus inits more oblong body, the flat pronotum, the long, slender tarsi, and the much longer claws on all tarsi. It differs from Peltodytes in the less developed and rimless coxae of the forelegs, which reach only to the posterior margin of the third abdominal sternite; last segment of palps smaller than penultimate segment. Body oblong, moderately shining, bare; dorsum delicately shagreened (except the head), light yellow, with longitudinal black lines or spots on the elytra. Head retractile into pronotum. Eyes moderately convex, not reaching anterior corners of pronotum. Last segment of palps needle- shaped. Pronotum transverse, rectangular; sides of posterior half parallel, slightly indented; pronotum narrower in the anterior half and flattened in its greater part; a longitudinal grooved line along the sides, which in the European species reaches beyond half the pronotum; a weak transverse depression at the base, between these two lines; lateral margins with delicate denticles. Anterior margin with a weak indentation at the sides; it slightly projects posteriorly in the middle and bears small 37 cilia. Elytra with 10 rows of dots which are in fact tertiary (secondary rows are present only in the American species, and primary rows are absent); rows 5 and 6 short and fused behind the middle; lateral margin with a denticle in the posterior half. Epipleura very long, reaching at least to the middle of the anal sternite, with dots at the base. Metathorax reaching posteriorly to the margin of the epipleura, separating the small episterna from the hind coxae. Process of metathorax between the mid coxae very broad, with a more or less deep groove; hind coxae broad and shorter than half their width, without lateral rim, hardly reaching posterior margin of 3rd sternite. Last abdominal sternite pointed apically, with a longitudinal groove at "/3 of its length. Femora and tibiae slightly thickened at the base. Tarsi slender; hind tarsi slightly longer than hind tibiae; 4th segment slightly shorter than lst segment and almost as long as 2nd segment. Claws long; hind claws almost as long as 2nd tarsal segment. Penis with a strong dorsal swelling, before the apical third. Parameres markedly differing in size, more symmetrical than in Haliplus; a fringe of hairs on the apical half present on both parameres. Larva (Figure 10) described only for Br.elevatus. Head semicircular, slightly broadened transversely, with spinules at the anterior margin; inner margin of mandibles with spinules at the base. Abdomen 10-segmented; last abdominal segment not reaching far beyond anus. Cerci FIGURE 10. small, with 6 setae. Thoracic and abdominal tergites, with Brychius 4 weakly developed warts. Pupa not described. elevatus The genus contains 5 species; 3 of them occur in Europe Рави» ILBTVAy (Br.glabratus Villa has a narrow distribution, occurring in mountain brooks in north Italy and Sardinia); the other 2 species occur in the U.S.A. and Canada. The species live exclusively inrapidly flowing water witha stony bottom, among moss, filamentous algae, Myriophyllum, Nasturtium, etc. They usually occur in small numbers, in early summer, together with rheophilous species, like species of Oreodytes. Key to Species 1 (2). Third interval of elytra slightly raised in form of a keel, gradually tapering anteriorly, with an irregular row of fine dark dots on the keel; this row is double in some places; 5th interval flat, like the CHAOS, ILGaedaS SAAS wots eis silo Sy 6 olsls *1, Br. elevatus Panz. 2 (1). Third keel-shaped interval of elytra well developed its whole length; it curves downward vertically only near the base of the elytra; it bears a row of a few small, not dark dots (nominate subspecies) or a row of more numerous, slightly larger black dots (subsp. rossi- cus Sem.). The 5th interval is also slightly raised for a short distance at the base. Length 3.75—4 шт .... 2. Br.cristatus Sahlb. 38 40 *1. Brychius elevatus Panz. (Figure 11) Panzer, 1794, Fn. Germ., 14:9 (Dytiscus); Ganglbauer, 1892:426; Reitter, 1908:201; Zimmermann, 1924:65; Scholz, 1929:7; Csiki, 1926:556; Guignot, 1947:58; subsp. intermedius Muller, 1908; Wien. Entom. Zeitg., XXVII:219; subsp. norvegicus Minster, 1923, Skr. Vidensk. Selsk., 1, (1922); Lindberg, 1930, Not. entom., X:123. FIGURE 11. Brychius FIGURE 12. Brychius elevatus Рап2. Para- elevatus Panz. meres. Oblong-oval, slightly shining; dorsum delicately shagreened, pale yellow; a narrow blackish stripe in the middle of the anterior margin of the pro- notum and at the posterior margin; margin of prothorax and metathorax, of first abdominal sternites, and inner margin of epipleura and last segment of palps more or less dark; 6—8 inner rows of dots on the elytra black (except at the apex); black lines in the 3rd and the 2 outer rows usually interrupted in the middle; in the two last rows, these lines are fused into spots anterior to the interruption: one spot behind the shoulders and the other near the apex. Head with dense and fine dots. Pronotum 1.3 times as broad as long, slightly wider than head, but the dots are more scattered and irregularly distributed, almost smooth in the middle; there is a distinct, fine punctation between the dots. Similar but more distinct punctation also present on the elytra. Elytra oblong, oval, slightly broader anteriorly than base of pronotum, then gradually broadening to the middle and tapering toward the apex, with an acute sutural angle. Dots on the rows of the elytra coarse; inner rows more strongly depressed. Third interval raised in form of a small ridge reaching beyond the middle, where it is abruptly interrupted; it gradually becomes lower anteriorly; the ridge bears an irregular row of fine, mainly blackish dots; 5th and 6th rows of dots very short and fused before the middle of the elytra; 5th interval flat. Process of prothorax convex, rounded triangular behind the fore coxae, with a hardly noticeable rim laterally which is more distinct at the base, and with an apical pit. Metathoracic process with 4 pits: 2 large pits in the middle, near the apex (one behind the other) and a small pit at the sides, slightly posteriorly. The longitudinal groove on the anal sternite occupies a third 39 41 to a half of its length. Penis strongly curved, forming almost a half circle, with a deep indentation in the anterior third of the dorsal side; apical third broad, with almost parallel sides; apex rounded, sometimes slightly broadened. Dorsal swelling large. Right paramere (Figure 12) broad, broadly rounded apically, with hairs at the apex and in the anterior third of the inner margin. Length 3.5—4 mm. Distribution. USSR: Latvia, Belorussia, Mogilev Region (Arnold). Central and partly southern Europe. *2. Brychius cristatus Sahlb. J. Sahlberg, 1873, Notis. Sallsk. Fn. Fl. Fenn. Forh., XIV:137; Scholz, 1929:7; subsp.rossicus Semenov, 1898, Hor, Soc. Ent. Ross., XXXI:542; Semenov, 1905, Russkii entomologicheskii obozr.IV:303; Lindberg, 1930, Not. entom., X:124. Closely related to B.elevatus, differing from it mainly in the more developed ridge in the 3rd interval of the elytra; this ridge is raised in the anterior half like in the posterior part; it is abruptly interrupted at the anterior end. Fifth interval slightly raised near the base in form of a short, narrow ridge. The black lines in intervals 7 and 8 usually not interrupted in the middle; unlike in B.elevatus, they are not fused into spots. In the nominate subspecies, the small ridges are uniformly yellow; the dots on the ridge are less numerous and not black; in subsp. rossicus,the dots are numerous and black, forming a black line. Length 3.5—4 mm. Right paramere of male less broadly rounded at the end than in B.ele- vatus, slightly narrower; its dorsal side with a deeper and broader indentation. Distribution. Northern and central parts of Europe and Siberia. Some authors (Minster, 1922; Hellén, 1923; Lindberg, 1939) consider B.elevatus and B.cristatus as the same species. It seems advisable to consider B.elevatus as consisting of a number of geographical forms (subspecies) which are more or less connected by transitional forms, because the differences in the male genitalia as described by Zimmermann are not significant and constant. Lack of material does not permit definition of the gradation of forms of this species; however, the following provisional scheme could be made: 1. Ridge on 3rd interval of elytra weak; dots on it very small, few in number, not always black. Coloration almost asin B.glabratus. This form is transitional to B.glabratus Villa.— Northern Italy on ese EIR A CT CIOL nite EPR CLOVER, BERNE ahs CASI subsp. intermedius Mull. 2. Ridge on 3rd interval of elytra strongly raised in the posterior half, gradually becoming lower anteriorly; dots larger, always black and may form a black line. — Distributed throughout Central Europe, from Spain to Germany; apparently absent in the USSR ..... subsp. elevatus Panz. 3. Ridge on 3rd interval of elytra higher; body more elongate, paler. — Scandinavia, southwestern Finland, probably Germany. USSR: Latvia, Belorussiay? Моем (Азвола) пе ee subsp. norvegicus Munst. 40 42 4. Ridge on 3rd interval of elytra keel-shaped; in the anterior half, in the 5th interval; it forms a short, weak, longitudinal swelling. Body shorter, broader, of more saturated coloration. Dots on ridge of 3rd interval black.— Forest and forest-steppe in the European USSR from southern Karelia, Estonia, Leningrad, and Kirov regions to the Ryazan and Vladimir regions and Tataria, northwestern Siberia (Tobolsk), south- western Yakutia; this form is not distributed farther southward* ee Meee nic eek НАТ ss eae tocinigioth phere pei st te cue... SUDSp. rOssicus sem. 5. Ridge on 3rd interval of elytra keel-shaped, sharply inclined downward anteriorly; on the 5th interval the swelling is larger, forming a short ridge. Dots on ridge of 3rd interval not black, smaller and shallower. Coloration dark; ribs light yellow.— Arctic Europe and Asia (Murmansk Region, northern Cisurals; northern Finland) ....subsp. cristatus Sahlb. The subspecies intermedius Mull. is known to me only from the description; it is intermediate between B.elevatus and B.glabratus from northern Italy; it is possibly more closely related to B.glabratus than to B.elevatus. In this case, B.glabratus would have to be included in the groupof forms of B.elevatus, although B.glabratus differs more sharply from B.elevatus than this differs from B.crista- Buse 3. Genus Haliplus Latr. Latreille, 1802, Hist. Nat. Crust. Ins., П:77; V:206; Ganglbauer, 1892:425; Yakobson, 1907:413; Reitter, 1908:202; Zimmermann, 1924:6,67; Scholz, 1929:27; Kainel, 1929:217; Lindbers, 1937, ActaySoc, Hn. »Pil.. Fenn), 60:4 78; Csiki, 1946:557; Guignot, 1947:38. Type species: Dytiscus obliquus Fabr. ae Last segment of palps small, conical; _met 3rd segment of maxillary palps 1.5 times as й long as 2nd segment; first two segments of labial palps almost equally long. Mentum with pointed median denticle in an indentation. Pronotum trapezoidal, broadest at the base and strongly narrowed anteriorly; convex dorsally (flat only in the subgenus Neohaliplus), with or without a longitudinal line at the sides, without a depression at the base, rarely with a more or less marked depression. Elytra with : 10 regular rows of dots, without presutural FIGURE 13. Haliplus, ventral: groove. Episterna of metathorax contiguous о dimiesi-mesorhorax: with the hind coxae (Figure 13). Large hind met — metathorax; $1+2+з — first three coxae in form of a plate, rounded posteriorly fused abdominal sternites; 34,55, $6 — and without a rim; they reach the end of the sternites 4—6. third abdominal sternite; their external angle $ 1+2+3 * The record оЁВ. rossicus Sem. from Transcaucasia (Clermont, 1909) is obviously incorrect. 41 43 forms а denticle into the small indentation оп the epipleura of the elytra. Two posterior-inner spines present at the end of the tibiae; fore tibiae simple, mid and hind tibiae with a dense comb of short denticles on either side. Hind tarsi as long as hind tibiae; first 4 segments gradually decreasing in length; 5th segment as long as the first. Claws small; on the hind tarsi, they are about half as long as the 2nd segment of the tarsus. The form of the penis and parameres varies but is markedly constant in the species. Penis more or less curved; parameres asymmetrical; right para- mere more differentiated and always with hairs; left paramere in form of a slightly triangular scale. Almost all species of the family show large variation of the morpholo- gical characters, a fact which makes identification of species difficult. Examination of the male genitalia is therefore important, as they vary little in form. CELT AM, FA Sts ee CRS ETI RGR UNS FIGURES 14—15. Larvae: 14 —Haliplus ruficollis Deg.; 15 — Н. fulvus (Fabr.). Larvae (Figures 14,15) described for 7 or 8 species. Body elongate, almost cylindrical; resembling the larvae of Brychius, but with a much longer last segment. Head inflated, rounded. Tergites (except the last) with 4—6 warts (middle warts sometimes absent) or with 6 tubercles with hairs at least on the anterior tergites. Abdomen 10-segmented; spiracles present on the 2nd thoracic tergite and on the first 7 abdominal tergites; last 3 tergites without spiracles. Legs of different length; forelegs prehensile. Pupa. Resembling pupae of Peltodytes, but more convex. Setae of almost the same length, situated on short, conical tubercles. Head with 2 setae on the frons lateral to the middle. Thoracic and abdominal tergites also with long setae. Spiracles present. The genus contains a large number of species (about 140), which are distributed almost throughout the world (mainly in the Palearctic Region); the species are grouped in 5 subgenera. Adults and larvae are weak Swimmers and live mainly in stagnant or slowly flowing water; they rarely occur in rapidly flowing water; they sometimes occur in brackish water. 42 44 Key to Subgenera 1 (2). Dorsum and venter delicately shagreened. Epipleura without coarse dots, but completely covered with fine dots. Dorsum ея ии а о, Owe Во ОО cls Wine sed Inlet! cur ba ois 1. Haliplus s. str. 2 (1). Dorsum and venter not shagreened; elytra of female sometimes with a more or less marked delicate network or fine punctation (mainly on the posterior and inner part of the elytra). Epipleura with dots arranged in rows or scattered. 3 (6). Sides of pronotum with a more or less long line. 4 (5). Pronotum with a well marked transverse depression at the base; this depression reaches the hind corners of the pronotum; longi- tudinal lateral line long, deep, strongly curved inwards. Dorsum EULER art a SING a A a AT A RS RR SIH ci RT 2. Neohaliplus Netol. 5 (4). Pronotum without transverse depression or with a weakly marked depression between the almost straight lateral lines (if lines present): Роги convex? shaw tse oe aie 3. Haliplinus Guign. 6 (3). Pronotum without lateral line; base of pronotum with coarse dots SMG GB ло Oley ооо о а 6 GU OuaNO TIONS оно Sho, Oak 4. Liaphlus Guign. 1. Subgenus Haliplus $. str. Guignot, 1947:41.— Haliplidius Guignot, 1928, Ann. Soc. Entom. Heo Kine li 192921951 С 519416555. Type species: Dytiscus obliquus Fabr. Whole body densely covered with fine dots, with more or less distinct sheen. Epipleura without coarse dots. Longitudinal rows on elytra consisting of fine, irregular, sometimes indistinct dots. Process of pro- thorax broad posteriorly, strongly narrowed anteriorly. Key to Species 1 (4). Process of prothorax without lateral rim, completely covered with fine dots; it also bears dense coarse dots; short line at the sides of the pronotum absent, or this line is weakly marked. Dorsum with weak sheen. 2 (3). Pronotum usually uniformly reddish yellow, sometimes slightly and not distinctly dark at the anterior margin. Black lines on elytra repeatedly interrupted but rarely fused. Femora uniformly light. Dorsum almost mat. Presutural groove irregular but distinct. Process of metathorax with one pit or smooth. Larger (3.25— Seon) eck а ah ee mtn о: le A ue obliquust(babr., ). 3 (2). Anterior and posterior margin of mesothorax broad, with a sharply delimited black border. Body shorter and broader. Inner longi- tudinal lines of elytra little interrupted; outer lines frequently interrupted and fused into spots in their greater part. Apex of 43 (45) 45 femora black. Presutural groove indistinct. Process of meta- thorax with two weakly marked pits. Smaller (2.75—3 шт) ..... Е О, О Una Orang iy rt ball, Lows *2. H. varius Nic. 4 (1). Process of prothorax with a distinct rim at the sides, covered with fine, scattered dots. Lateral lines on pronotum distinct. Longitu- dinal lines on elytra well marked, little interrupted or slightly fused, rarely weakly marked. Dorsum more shining. .*%3. H.confinis Steph. *1, Haliplus (s. str.) obliquus (Fabr.). Fabricius, 1787, Mant. ins., 1:193 (D Varese $); Zimmermann, 1924:69; Scholz, 1929:9; Csiki, 1946:560; Guignot, 1947:41.— ab. albinus Reitter, 1911, Wien. Entom. Zeitg., 30:277; Zimmermann, 1924:69; Scholz, 1929:9; ab. muelleri Reitter, 1912, Wien. Entom. Zeitg.,31:277; Zimmermann, 1924:69; Scholz, 1929:10; ab. obsScurellus Guignot, 1947:214.— amoe- nus Olivier, 1795, Entom., Ш:32; Ganglbauer, 1892:431; Reitter, 1908:202; Kinel, 1929:35. Oblong-ovoid, pale yellow; head usually with a large, rounded, brown or black spot on the vertex; pronotum usually of uniform color, anterior margin rarely and also posterior margin even more rarely slightly dark in the middle; suture of the elytra black; black lines usually repeatedly interrupted so that the yellow background forms a broad band in the anterior third which runs obliquely to the shoulder and there is a double spot in the posterior third (its inner half near the suture and the outer half closer to the lateral margin); a yellow triangular spot is near the apex. The coloration varies from pale yellow with a weak pattern to FIGURE 16. Haliplus obliquus dark brownish red with sharp black lines on (Rabe BAsAINeESs: the elytra and a spot on the head (typical form). Elytra with black lines which are widely interrupted but distinct (Е. typica), or light with only rudimentary black lines (ab. muelleri Rttr.), or elytra entirely of one color (except for a dark presutural line), light yellow (ab. albinus Rttr.), or elytraare dark red, with strongly developed black lines which are also fused in some places with the coarser dots in the rows (ab. obsScurellus Guign.). Punctation on head dense and fine. Second segment of labial palps without denticle at the apical corner. Pronotum always without lateral lines, with a row of coarse dots on the anterior and posterior margin, which is sometimes interrupted. Prothorax with coarse dots, without lateral border. Process of metathorax with a weakly marked pit which is sometimes absent. Hind and forelegs with broadened first three segments; their inner apical angles projecting and covered with hairs. Right paramere (Figure 16) with broad blunt apex; the fringe of hairs begins at the 2nd third of the concave margin and extends to the apex; hairs becoming gradually longer; apex also with a small fascicle of 4 or 46 5 hairs which are situated some distance from the fringe. Penis uni- formly curved, with rounded apex, without a hood on the dorsal side. Length 3.25—3.75 mm. Elytra of the female shagreened; this is especially distinct in the inner half of the elytra; a shagreened surface is absent in the other species of the subgenus. Distribution. European USSR (except extreme north), Transcaucasia, probably Siberia. Central and partly Southern Europe, Asia Minor (Baskoy, Erzerum, in collections of Bening), Iran (Urmia Region). Ecology. The species occurs in stagnant water overgrown with vegetation, among Chara, and also in brackish water and puddles along the seashore. It also occurs in the subalpine zone. Rare. *2. Haliplus (s. str.) varius Nic. Nicol, 1822, Diss. col. agri Hal. :34; Ganglbauer, 1892:431; Reitter, 1908:202; Kinel, 1922:35; Scholz, 1929:9; Csiki, 1946:560; Guignot, 1947:41. Short-ovoid, slightly shining, pale yellow; venter lighter, pronotum with a broad, well marked black stripe at the anterior and posterior margin; head with a short, small, longitudinal spot at the sides; spot on vertex usually absent; a narrow black ring on the anterior coxae and at the outer margin at the apex of the femora. Head densely punctate; 2nd segment of labial palps with a strong denticle at the inner apical corner. Sides of pronotum with a short, weak, sometimes indistinct longitudinal line near the base. Elytra with a narrow black band at the base and with a black suture; the 4 inner black lines usually complete, the outer lines interrupted in the middle and sometimes fused into spots; rows of dots irregular; dots weakly depressed; intervals between rows covered with scattered dots of different size. Process of prothorax broad posteriorly, strongly narrowed anteriorly. Process of metathorax with shallow pits lateral to the middle. Right paramere of male pointed anteriorly, with concave ventral margin; a fringe of long, dense, red hairs from the 2nd third to the apex; a fascicle of shorter hairs at the apex close to the fringe. Penis thick, uniformly curved toward the apex; dorsal side with a low, long hood. Length 2.75—3 mm. Distribution. USSR: north and central belt of the European part, to the Moscow, Bryansk, Penza and Saratov regions in the south. Northern and Central Europe. Ecology. Slowly flowing rivers with sandy bottom and backwaters. Very, rare. *3, Haliplus (5. str.) confinis Steph. Stephens, 1828, ПЛ, Brit. Entom., П:41; Ganglbauer, 1892:432; Reitter, 1908:202; Kinel, 1922:35; Scholz, 1929:9; Csiki, 1946:561; Guignot, 1947:43; aby рае Fowler, 1687, Col’ Brit. Isl., 12155; Scholz, 1929:9; Guignot, 1947:43; ab. halbherti Bullock, 1928, Entom. Month. Mag. 14(64):103; Guignot, 1947:43.— lineatus Aubé, 1836, Icon. Col., V:21; Seidlitz, 1887:29. 45 47 Light yellow (rarely reddish yellow); dark lines оп elytra usually well developed, slightly or not interrupted (f. typica); they are often strongly reduced or absent (ab. pallens Fowl.); they are sometimes fused for a larger or smaller distance (ab. halbherti Bull.); coloration as variable as in H.obliquus. Pronotum with а distinct lateral line; process of prothorax strongly narrowed anteriorly, with a broad dark rim at the sides, without coarse dots (but with fine punctation). Process of metathorax with two small pits. Length 3.25—3.75 mm. The species differs from H.obliquus in the shorter body, the strong sheen, the usually not interrupted black lines on the elytra, etc. —- FIGURE 17. Haliplus confinis Steph. Parameres. The right paramere (Figure 17) is twice as large as in H.obliquus; it is massive, its hair cover is strongly reduced, and a fringe is present only in the apical fourth, consisting of short and sparse hairs which are slightly longer at the apex; fascicle of hairs at the apex absent. Penis with broad base; it is bent at an angle at almost half its length; its apex is transversely broadened in form of an ax. Distribution. USSR: whole northern and central belt of the European part, Transcaucasia, Siberia (except Far East). Northern, Central and partly southern Europe. Ecology. It occurs in shallow water, in backwaters of rivers, among Myriophyllum and Lysimachia. Often found in brackish puddles on the seashore. It occurs to the subalpine zone. 2. Subgenus Neohaliplus Net. Netolitzky, 1911, Deutsch. Entom. Zeitschr.:273; Guignot, 1947:43.— Protohaliplus Scholz, 1929, Entom. Nachr., III:29; 1929:8; Kinel, 1929:219. 46 48 Туре species: Haliplus lineaticollis Mrsh. Pronotum with a strong transverse depression at the base, which reaches the posterior angles of the pronotum; longitudinal lateral line long, deep, strongly curved inward. Prothoracic process with a distinct transverse rim at the base. Epipleura without dots but shagreened. Only one species. *4. Haliplus (Neohaliplus) lineaticollis Mrsh. Marsham, 1802, Entom. Brit.:429; Ganglbauer, 1892:431; КеЩег, 1908:204; Scholz, 1929:8; Kinel, 1922:35; Csiki, 1946:570; Guignot, 1947:43; ab. nitidicollis Miller, 1900, Verh. zool.-bot. Ges. Wien, 50:23; Guignot, 1947:43.— ab. pallidus Sahlberg, 1908, Oefv. Finsk. Soc. Forh., XLV, 18:6;— ab. be ckmanni Ahlwarth, 1913, Deutsch. Zeitschr.:90; subsp. suffusus Wollaston, 1863, Ann. Mag. Nat. Nist., (3)Х1:216; Guignot, 1947:43; subsp. pici Régimbart, 1895, Mém. Soc. Ent. Belg. IV:9; Guignot, 1947:43. Oblong:ovoid, slightly flattened, shining. Head black, dark brown or reddish brown. Pronotum yellow, dark at the anterior margin; disc witha black or brown longitudinal spot or stripe, rarely without spot. Elytra dirty yellow, with black suture and a few more or less distinct dark spots (as in P.caesus), sometimes without spots; dots dark at the bottom; venter, mouthparts and legs reddish yellow; abdomen usually at the base. The species varies markedly in coloration, size, punctation and other characters; pronotum of uni- form color, without dark longitudinal line (ab. nitidicollis Miull.), or elytra completely light BICURE TS) Нар linea> (ab. pialiidus Sahlb.).\ Head withidense, coarse ее dots which are more scattered in the middle and in the posterior half. Second segment of maxillary palps distinctly broadened. Pronotum strongly narrowed anteriorly; anteriorly, in the midline and near the base, it is covered with distinct but not very dense dots; depression near the base with coarser dots; lateral lines long, reaching the midline, more or less curved inward, usually dark; lateral rim thick. Elytra almost parallel to the middle, with a row of coarse black dots and dark suture; intervals with few fine dots; the dark color of the dots sometimes spreads into the spaces between them and in some places forms short longitudinal black lines or spots (a common spot on the suture and 4 smaller spots arranged in a square across the suture). Dots in rows moderately developed; first dot in each row strongly depressed, pit-shaped. Process of prothorax with parallel sides to the apex, witha distinct transverse rim at the base, and with a longitudinal groove which is broader posteriorly; process of metathorax with two lateral keels which gradually disappear posteriorly. Penis slightly curved, its inner margin concave, its apex rounded. Right paramere (Figure 18) slightly larger than left but narrower, slightly triangular, with a fringe of hairs along the whole inner margin to the apex; some hairs indistinctly and slightly thickened in form of a narrow funnel. Length 2.5—5mm. 47 Distribution. USSR: south of the European part, Crimea, Тгапз - caucasia. Central and southern Europe (to an altitude of 2,300 m in the Alps), North Africa, Asia Minor. 4a. Haliplus (Neohaliplus) lineaticollis suffusus Woll. Dorsum very dark; black dots fused into dark lines in some places. Distribution. Canary Islands. 4b. Haliplus (Neohaliplus) lineaticollis pici Rég. Small (2.3mm); spots on elytra well developed; punctation weak. Distribution. Algeria. 4c. Haliplus (Neohaliplus) lineaticollis arabicus Zaitzev, subsp. п. Body more oval, less oblong; dorsum slightly convex, not flattened. Transverse depression at base of pronotum weakly developed. Larger (3.3 mm). . Distribution. Arabia (Yemen, X-XI, 1931, Zhenzhurist, 3 specimens). 3. Subgenus Haliplinus Guign. Guignot, 1939, Bully soc. Entom,. ick, 176; ©5151 195 6co 50 = Е’а ое 5. str. Guignot (early works); Kinel, 1929:219. Туре species: Dytiscus ruficollis Des. Pronotum with a more or less long line at the sides; process of pro- thorax without rim at the base; inner margin of hind tibiae without groove with hairs; epipleura with rows of dots, at least at the base. Key to Species 1 (34). Dorsum and venter yellow or reddish, of uniform color or with dark lines or spots on the elytra, never uniformly black. 2 (7). Elytra tapering posteriorly in form of a wedge, broadest at the shoulders. Pronotum short, its sides strongly converging anteriorly. Hind tibiae and tarsi shagreened, with some smooth areas. 3 (6). The repeatedly interrupted black lines of the elytra usually fused, forming 2—4 more or less distinct spots in the posterior half. 4 (5). Larger (2.5—2.75 ют). Lateral lines on pronotum short and thin. Punctate rows on the elytra finer; first dots of rows 3—5 not larger than in the other rows, sometimes finer; the rows are often strong- ly depressed, or grooved in the posterior half; dots in the 15% (presutural) interval dense, they differ little in size from the dots 48 50 8 (15). 9 (10). 10 (9). 21 (14). AP (GIS) 13 (2). та (a) in the other intervals. Prothoracic process with a longitudinal depression. Last sternite with a transverse row of coarse dots. Claws of forelegs of male of different size, inner claw larger, longer and more strongly curved. Elytra of female delicately shagreened, mainly in the posterior half, but often on the whole surface, rarely only at the apex (shagreened surface absent in ONE CAGE. СА а AIMED ly И. be *5. H.(H.) ruficollis (Deg.). Smaller (2.25—2.5 mm). Body broader and shorter; lateral lines of pronotum longer and sharper. Rows of dots larger; first dots of rows 3—5 large, each broadened into an oblique-angled pit; dots on presutural interval scattered, very small, much smaller than in the other intervals. Elytra of female without shagreened surface or rarely with only traces of a shagreened surface at the apex. Clawsyvotiforelegs of male equaland symmetrical (2.75%. si. «| PRIA ыы а ан *6, Н. (Н.) heydeni Wehncke. Elytra without dark spots; dots of rows 4—5 sometimes connected in the middle by longitudinal black lines. Ventral margin of lst segment of mid tarsi strongly indented...............-. И eee SM Oe ube Gol aint М ES) горести. Elytra less strongly narrowed posteriorly, broadest behind the shoulders; body more oblong, oval. Pronotum longer, its sides less converging anteriorly. Black lines on elytra complete or interrupted or absent; they may be fused into spots. Shagreened surface on hind tibiae continuous, without smooth spaces. Process of metathorax with a distinct oblong pit or witha short row of dots lateral to middle. Elytra with distinct, not interrupted blackish lines which are never fused into spots; elytra of female НЕЕ and densely shagreened. Sides of elytra almost parallel to "Ig of their length (as in H.imma- culatus). Last antennal, segment usually dark о день ее, On em *8. Н. (Н.) apicalis Thome: Elytra with dark spots; dots in presutural interval almost as large as those in the rows of dots. Process of prothorax narrowed anteriorly, constricted before the fore coxae. Elytra slightly sloping apically but without distinct indentation. Process of prothorax straight or slightly convex, without groove or small rim, with sparse dots. Pronotum longer, half as long as width of base; lateral lines deep, straight, long............--. о al 5 Ma Lee elie tebe owen мо Жо. Wee (ae), fulvacolhis вв. Process of prothorax with a groove, single in anterior half, but divided behind the fore coxae into two branches which are parallel to the weakly raised lateral margin; smooth in the middle, with several dots. Pronotum short, only "3 as long as width of base; lateral lines thinner, slightly curved inward, not parallel to the late ralemarsinn oo. ec Е *10. H.(H.) furcatus Seidl. Process of prothorax with almost parallel sides, slightly narrower before the fore coxae than at the base. Elytra distinctly sloping toward the apex, with a small apical indentation; sutural angle pointed. Body broad, oval, equally narrowed anteriorly and 49 51 25 (24). 26 (31). 27 (30) 28 (29). 29 (28). posteriorly. Suture and 2 small rounded spots in intervals 2 and 4 dark, but their coloration may vary. ...11. H.(H.) sauteri Zimm. Process of metathorax smooth or with a more or less deep depression in the middle, without pits at the sides. Head more or less dark (except clypeus). Head, except clypeus, black or dark brown, with strong and dense dots. Lateral line of pronotum long. Metathorax straight. Process of prothorax covered with fine dots, straight ........ ео 12. H.(H.) japonicus Sharp. Heed Snel darker than pronotum; darkening on vertex distinct. Lateral lines shorter. Process of prothorax covered with large, dense dots, with a more or less distinct median groove. Meta- thorax usually мата prt) та the оао п *13. H.(H.) hummeli Falk. Head reddish yellow, like the other parts of the body. Elytra with dark spot on the suture, behind the middle; this spot is formed by the fusion of the two inner dark lines. Sides of body slightly rounded, with almost parallel sides. Rows of dots small НО ati del lease аа лоза *14, H.(H.) samojedorum Sahlb. Elytra without black spot on the suture. Elytra uniformly reddish or with traces of dark color. Dots in presutural space slightly weaker than dots in the rows. Process of prothorax with a distinct longitudinal depression .......... sR ie NB bee na ae er Peale ke WOR eg ik *15, H.(H.) schaumi Solsky. Elytra reddish yellow or yellow, with blackish longitudinal lines which are either complete or interrupted, rarely fused into spots. Dots in intervals much smaller than dots in the rows. Process of prothorax flat or slightly convex, without lateral rim. Middle of metathorax straight, without pit. Lateral lines of prothorax short, sometimes in form of a pit or depressed dot. Row of dots on first (presutural) interval usually regular. Claws on forelegs of male almost symmetrical. Elytra of female delicately shagreened on almost their whole surface, except in a small triangular field near the scutellum ... *16. H.(H.) fluviatilis Aubé. Process of prothorax between fore coxae with a weak longitudinal depression at least in the anterior half, so uae a low rim is formed at the sides. Lateral lines of pronotum only 15 as long as pro- notum. Blackish longitudinal lines of elytra short but usually not inter- rupted (at least the two inner lines); outer lines very short. Claws of fore tarsi of males asymmetrical; inner claw shorter and more strongly curved. Lighter, shorter, slightly broader at the shoulders. Process of prothorax more strongly narrowed anteriorly, with a stronger rim and a deeper groove. Right paramere of male with a longer fringe of hairs which reaches to the apex ...%*17. H.(H.) lineolatus Mnnh. Darker, slightly longer (as in H.immaculatus). Right para- mere with a shorter fringe of hairs which is interrrupted before THEN A eda A oy re Mallia avtepiey ic eral uel earOMeL oul *18. H.(H.) interjectus Lindb. 50 30 (27). Claws of fore tarsi of male symmetrical. Process of prothorax strongly narrowed; groove deep... .*19. H.(H.) sibiricus Motsch. 31 (26). Blackish lines on elytra usually broad, well developed, reaching the base, little or not interrupted; both external lines shortened anteriorly; dark lines rarely less well developed. 32 (33). Smaller. First segment of mid tarsi (in side view) strongly curved; its ventral margin strongly concave. Claws of fore tarsi of male symmetrical or almost symmetrical. Elytra of female weaklyachinine, shagreeneds ranrely.SmOOthg. +... 5 ее. Я u sein ey te cles cae Ball *20. H.(H.) transversus Thoms. 33 (32). Larger. First segment of mid tarsi of male smooth ventrally. Elytra and epipleura of female not shagreened, shining. Rows of dots in posterior half of elytra strongly depressed, forming distinct Broovesy аа. о ЭДС #21. Н. (Н.) immaculatus Gehrh. 34 (1). Body strongly shining, black; head dark chestnut brown; mouth- parts, antennae and legs reddish. Claws of forelegs of male asymmetrically welytracofpiemalesshagreened ›.. неее. *22. Н.(Н.) alsaticus Scriba. *5. Haliplus (Haliplinus) ruficollis (Deg.) (Figure 19). Degeer, 1774, Ins., 1V:404 (Dytiscus); Ganglbauer, 1892:430; Kinel, 1922:34; Zimmermann, 1924:72; Scholz, 1922:10; Csiki, 1946:61; Guignot, 1947:44; var. multipunctatus Wehncke, 1875, Deutsch. Entom. Zeitschr.:122. Body short, ovoid, strongly shining, broadest at the shoulders, narrowed almost like a wedge posteriorly. Yellowish red, rarely pale yellowish; head and pronotum lighter, but anterior and posterior margin slightly dark; elytra with black, repeatedly interrupted lines which are usually (but not always) fused into 2—4 oblique spots in some places; inner lines sometimes fused into a common sutural spot. Head with fine, more or less scattered dots; second segment of labial palps with a denticle on the inner side, near the apex. Pronotum short, strongly narrowed anteriorly, with strong, scattered dots whichare almost absent on the disc; sides of base witha short or very short, usually thin line which does not reach beyond the first third of the pronotum. Elytra forming a pointed angle at the apex, with more or less coarse, black dots; first dots of rows 3—5 not larger, sometimes smaller than the first dots of the other rows; firstdots of 3rdor 2nd rows rarely as coarse as in H.heydeni, but usually only on one elytra; presutural inter- val with fine dark dots which are scattered, and irregularly arranged near the base, little FIGURE 19. Haliplus ruficollis differing in size from the dots in the other rows. Deg. Prothoracic process almost three times as broad 51 at the apex as anteriorly, with distinct, dense dots; а small groove in the 52 middle whichis more or less short; sides almost uniformly converging anteriorly and with a weakly marked rim in the anterior half. Metathoracic process with a narrow, shallow groove in the middle. The two penultimate sternites witha large, deep, transverse groove, usually covered with dots; these dots are rarely smoothed down or absent; anal sternite with dots. Fore claws of male of different size: inner claw thicker, more strongly curved, and shorter by a third than the outer claw. Penis slightly directed to the right, curved only in the apical quarter; its dorsal side inflated like a hood behind the middle; it gradually tapers toward the end in the apical third; apex narrow, slightly blunt. Right paramere (Figure 20) broad, slightly broader and broadly rounded at the apex (it sharply differs in this character from all other species of this group), with a fringe of hairs in the apical half, and with a deep groove which reaches the apex in the apical third; a small fascicle of hairs at the end of this groove. Female. Usually with very fine, hardly discernible shagreened surface on the outer and posterior half of the elytra; the shagreened surface is either more widely extended or reduced in some cases. Length 2.3—2.8 mm. Var. multipunctatus Wehncke.— Dots in the rows of the elytra larger, sometimes very deep posteriorly, forming a well marked groove. Base of pronotum with weakly marked transverse depression; lateral line longer and deeper; shagreened area of elytra of female absent or hardly marked at the apex. This species varies strongly in form of the body and especially in coloration; the spots on the elytra may be weakly marked or absent or they may be so strongly marked that they become fused. Distribution. USSR: European part, West Siberia, Transcaucasia, Kazakhstan. Europe, Asia Minor. FIGURE 20. Haliplus ruficollis Deg. Parameres. *§. Haliplus (Haliplinus) heydeni Wehncke. Wehncke, 1875, Deutsch. Entom. Zeitschr.:122; Ganglbauer, 1892:430; Zimmermann, 1924:74; Kinel, 1922:34; Scholz, 1929:116; Csiki, 1946:563; Guignot, 1947:45.— foveostriatus Thomson, 1884, Ор. entom., X:1037.— transversus Falkenstrom, 1939, Ark. zool., 32, No. 6:30 (nec Thomson). Closely related to H.ruficollis in form, coloration, and pattern of the elytra; however, it is smaller, the scutellum is shorter, more pointed 53 posteriorly; lateral lines of pronotum longer at the base and more distinctly curved inward; there is usually (but not always) a transverse depression in the middle of the pronotum, between the lateral lines. Punctation of pronotum finer and more scattered. Dots in the rows on the elytra (especially in the inner rows in the anterior half) larger; the 1st dots of rows 3—5 much larger than in the other rows; they are usually broadened into an oblique pit; intervals with fine dots; dots in presutural interval a2 much smaller and differing markedly in size from the dots in the other intervals (the contrast is sharp); primary rows of dots at the base almost always regular, normal, not double by being mixed with additional dots (as in H.ruficollis). Prothoracic process covered with more numerous scattered dots than in H.ruficollis, with a weakly marked groove only in the anterior half. Process of metathorax usually flat and without groove, or with a hardly marked depression. A transverse row of dots is near the posterior margin of the penultimate sternite; these dots are usually smaller than in Вот lisa. Length 2.2—2.5 mim. Male. Fore claws symmetrical, equally long and curved. Dorsal margin of penis less convex than in H.ruficollis; anterior half of penis almost uniformly broad; apex of penis broadly rounded (much broader than in H.ruficollis); anterior third strongly curved downward, forming an angle on the ventral side; hairs of fringe of right paramere (Figure 21) gradually longer toward the apex. Female. Elytra completely smooth, without shagreened surface. DisStruputi1 om Like НЫ. ruticollis, but occurring much more rarely (according to Guignot, "mainly in brackish water"). FIGURE 21. Haliplus hey- deni Wehncke. Parameres. *7, Haliplus (Haliplinus) robertsi Zimm. Zimmermann, 1924:73; pallidus Roberts in: Falkenstrom, 1925, Ark. zool., 18, No. 5:1 (not Sahlberg). This species differs from H.ruficollis in the absence of dark spots on the elytra; only dots in the rows (except rows 9—10) black at the bottom; dots т the middle of rows 4—5 may be connected by thin, dark, longitudinal lines. Body oval, slightly larger, more convex, broader at the shoulders than H.ruficollis. Head slightly broader, covered with dense, uniform dots. Pronotum with short, deep, lateral lines. Process of prothorax less narrowed before the fore coxae, with a longer and broader groove. Medium pit of metathorax continuing in form of a flat, broad groove which reaches the anterior margin of the metathorax, so that the anterior part of the meta- thorax is divided into 2 slightly raised triangular tubercles. First seg- ment of mid tarsi longer, its ventral margin strongly concave (almost as in H.lineolatus Mnnh.). Length 3mm. Right paramere of male thickened anteriorly, narrow and blunt at the apex unlike in H.ruficollis; its ventral side with a fascicle of long hairs in the anterior half. Penis much broader apically than in H.ruficollis. (We know this species only from the description.) Distribution. USSR: Kamchatka (valley of the Paratunka River, ш а hot spring). North America. 53 54 *8. Haliplus (Haliplinus) apicalis Thoms. Thomson, 1868, Skand. Col., X:293; Zimmermann, 1924:78; Scholz, 1929: 12; Сэ, 1946:565. — striatus Sharp, 1669, Entom. Monthl. Мао., У. — inornatus Zaitsev, 1910, Zapiski Imperatorskoi Akademii Nauk, (8) XVIII:26. Less convex than the other species of the subgenus, narrow at the shoulders; sides of elytra parallel to “ils of their length (especially in the female), then tapering rapidly; both elytra not rounded together at the apex, but each prolonged into a short point. Dots atanterior and posterior margin of pronotum more or less dark; black lines on elytra complete, not fused into spots and not interrupted, reaching to the base; outer lines usually reduced. Last antennal segment usually dark at the end. Process ofpro- thorax with shallow, scattered dots, with a shallow depression, sometimes with a hardly noticeable lateral rim, covered with shallow, scattered dots; anterior half almost without dots. Pits lateral to the middle of metathorax weak, often in form of a hardly noticeable, shallow depression, middle smooth. Length 2.5—2.8mm. Penis slightly convex, broad; sides of its anterior half almost parallel; broadly blunt at the apex. Right paramere long, gradually tapering, with isolated hairs on the ventral side; a thin fascicle of hairs at the apex. Claws of forelegs symmetrical; elytra of females rarely shagreened, stronger than in the other species of the subgenus; this gives a silky sheen to the surface. Distribution. USSR; extreme north of the European part and Siberia. North of Western Europe. Ecology., It occurs in brackish water on the seashore; accidentally in fresh water. *9. Haliplus (Haliplinus) fulvicollis Er. Erichson, 1837, Kaf. Mk. Brndbg., 1:186; Ganglbauer, 1892:430; Kinel, 1922:33,37; Zimmermann, 1924:79; Scholz, 1929:12; Csiki, 1946:565; Guignot, 1947:48.— jakovlevi Semenov, 1897, Trudy Russkogo Entomo- logicheskogo obshchestva, XXXI1:545. Oblong-oval, more shining, reddish yellow or rust-red (rarely light yellow); vertex and anterior margin of pronotum reddish brown in the middle; dots on elytra black; instead of black lines there are sharp spots resembling the pattern of H.variegatus, suture brown; dots rarely diffuse, leaving only rudiments in form of brown longitudinal lines. Рго- notum short, half as long as width of base; lateral lines straight and deep. Dots in rows of elytra only slightly stronger than dots in intervals; distance between dots either larger or smaller; dots of presutural interval situated slightly further from the suture than in the other species. Process of prothorax flat or slightly convex; it is constricted before the fore coxae and not more than half as broad as the base; there is no groove or rim and it is covered with very fine and scattered dots. Process of metathorax smooth in the middle; there are distinct longitudinal depressions lateral to the middle. Length 2.6—3 mm. 54 55 Fore claws of male almost equal. This species (like H.furcatus) differs markedly from the other species of the ruficollis group in the form and arrangement of the hairs on the parameres. The right paramere (Figure 22) is narrow and its ventral margin has a fascicle of long dense reddish yellow hairs in the middle; the second fascicle is similar but shorter and situated at the apex. Penis strongly convex, narrowly rounded apically. Elytra of female shining, not shagreened. Distribution. USSR: European part, in the north to the Leningrad Region, West Siberia, Transcaucasia. Northern and Central Europe. Ecology. Occurring in puddles in spring, after the flooding of rivers. Rare. Ш S \ FIGURE 22. Haliplus fulvi- FIGURE 23. Haliplus furcatus Seidl. collis Er. Parameres. Рагатегез. *10. Haliplus (Haliplinus) furcatus Seidl. Seidlitz, 1887:33; Ganglbauer, 1892:130; Kinel, 1922:33; Zimmermann, 1924:80; Scholz, 1929:12; Csiki, 1946:566. Resembling H.fulvicollis, but differing in its smaller size, its shorter pronotum (length equal to a third ofits width); lateral lines thinner, slightly curved inward. Coloration slightly lighter than in H.fulvicollis, sometimes light yellow. Inner longitudinal dark lines at the base of the elytra broad and forming a spot in the region of the scutellum; this spot is absent in H.fulvicollis; the spots are sometimes less distinct and form diffuse cloudy patches; the black lines are more distinct in this case, 1.е., the pattern slightly resembles that of H.fluviatilis. Dots in the rows of the elytra situated closer together; row of dots in the presutural space situated closer to the suture than in H.fulvicollis. Process of prothorax slightly covered with dots; there is a groove in its anterior half which is divided into two branches behind the fore coxae; these branches are parallel to the laterl margin, close to it; they thus surround the middle of the process in the form of a smooth triangular field covered with isolated Gots. Jength:2.2—2.63mm. Fore claws of male of equal length. Penis with a slight indentation; dorsal side of penis convex only in the posterior half, almost straight in the anterior half; a shallow indentation near the rounded apex. Right paramere 55 56 (Figure 23). with long apex, its ventral margin with isolated short, thin hairs which form a thin fascicle at the apex. Elytra of female not shagreened. Distribution. USSR: Kursk, ?Georgia. Northern and Central Europe. Rare. 11. Haliplus (Haliplinus) sauteri Zimm. Zimmermann, 1924, Entomol. Bl., XX:130. Body broad-oval, broadest in the middle, uniformly and strongly tapering anteriorly and posteriorly; reddish yellow; each elytron with 2 rounded spots in intervals 4 and 7; dots in the rows are brown; the anterior spots situated in the middle, posterior spots in the distal quarter; one of the outer spots is situated before the middle, the other behind it. Coloration varying, either lighter or stronger. Head with coarse, dense dots, but vertex almost completely smooth. Anterior and posterior margin of pro- notum strongly but irregularly punctate; lateral line broad, pitlike. Rows of dots of elytra with coarse dots; dots smaller in the intervals; however, both types of dots are finer in the posterior half. Process of prothorax broad posteriorly, slightly convex in the middle, with a distinct lateral rim, covered with large dots. Process of metathorax with a deep pit lateral to the muddle. wengith’2 3) main: Front claws of male of equal length; left paramere short, slightly narrower anteriorly; anterior third of ventral margin with dense, long, shaggy hairs. Penis narrow, slightly convex, with almost parallel sides. Elytra of female not shagreened. Distribution. Taiwan (after Zimmermann). Zimmermann adds to the description that he also had several specimens from China (Tientsin) which could be considered as this species; however, they differed from it slightly in the following characters: body less rounded laterally; broadest part of body displaced anteriorly; head less densely punctate; dots in the rows situated closer together; row of dots in pre- sutural interval slightly more marked, etc. Zimmermann thinks that this form could be considered as a variety of H.sauteri or even as a different species. We have several specimens from Shanghai which are transitional between these two forms. 12. Haliplus (Haliplinus) japonicus Sharp. Sharp, 1873, Trans. Entom. Soc. London:55; idem, 1884:440; Régimbart, 1899:191; Zimmermann, 1924:75. Elytra not very broad at the shoulders; their broadest part is situated in the first third of the elytra. This species differs from the other species of the H.fluviatilis group in its black or dark brown head (except the clypeus). Only the inner black lines on the elytra are complete but weakly marked; outer lines broken into small lines or absent; there are some- times weak diffuse spots (2 weakly projecting, irregular rows of small, almost square spots, one in the middle and the other behind the middle). 56 57 Head with coarse and dense dots; pronotum with similar dots оп the whole surface except in the middle; lateral lines long. Dots in rows black at the bottom, strongly marked; first dots in rows 4—5 large; dots in the interval very small and widely separated. Metathorax straight. Process of pro- thorax slightly narrower anteriorly, covered with fine dots, with a distinct lateral rim, without groove in the middle. Length 3—3.25 mm (according to Régimbart — 1.75—2 mm). Fore claws of male thin, of equal length; right paramere short, pointed, and with a fringe of long hairs in the anterior third of the ventral margin and at the apex; female not shagreened. Distribution. Japan, China (Kansu). *13. Haliplus (Haliplinus) hummeli Falk. Falkenstrom, 1932, Entom. Tidskr.:191; same author, 1933, Ark. zool., ада Мо. ls idem, 1936) Lignan, se.) точен, ,,15:79.. Body thickset, broadest in the anterior third of the elytra. Head dark reddish brown, more or less dark on the vertex, with sharp, dense, fine dots anteriorly, almost smooth behind the eyes; distal end of middle segment of labial palps with a denticle on the inner side. Pronotum yellow, narrowly dark in the middle of the anterior margin, twice as broad as long at the posterior margin; lateral lines short, at most а third as long as the pro- notum which is covered with fine, dense dots anteriorly and with slightly coarser and more widely spaced dots laterally and posteriorly, almost smooth in the middle. Elytra with the normal rows of dots; first row with very fine and very dense dots after the first quarter; first dots of rows 2—5 markedly coarser; dots finer at the shoulders and not larger than dots in the intervals; presutural row complete, regular, with very fine, dense dots; there are only isolated dots in the outer intervals and these only anteriorly. Suture and often also anterior margin of elytra narrowly black; females with black spots on the elytra; males without spots and with traces of black lines (possibly specimens with weakly developed coloration?). Venter uni- formly yellowish. Process of prothorax with a distinct lateral rim, its sides with dense, fine dots, its middle slightly convex almost smooth; process of metathorax with dense dots, its middle smooth, without lateral depressions or with a more or less distinct pit; hind coxae with coarse dots; their posterior margin with a sparse row of 7—9 very short setae. Anal sternite with fine, dense dots in the apical part; its basal half with coarse and sparser dots. Length-3—3 /5)mm: Claws of fore tarsi of male small, simple; inner claw slightly thicker and broader in the basal half. Parameres slightly sclerotized; right para- mere with slightly curved dorsal side, almost uniformly broad; apical third of its ventral side with dense hairs of equal length. Penis slightly curved, with long, uniformly broad, broadly rounded apical part. Elytra of female not shagreened. This species was described from one male and 2 females from China (Szechwan). We identify our large series of specimens from Shanghai (Zhenzhurist) and 4 specimens from the vicinity of Vladivostok (Sedanka River, Cherskii) as this species. 57 58 *14, Haliplus (Haliplinus) samojedorum Sahlb. J. Sahlberg, 1880, Sv. Vet. Akad. Handl., XVII:45; Zimmermann, 1924:75; Zaitsev, 1910, Zapiski imperatorskoi Akademii Nauk (8), XVIII:26. Oblong-oval, with slightly rounded sides which are almost parallel (especially in the female). Last antennal segment not black. Pronotum with a brown stripe at the posterior margin; black lines of elytra repre- sented only by small dashes, mainly in the posterior half. The two inner lines fused into a presutural spot; lines 3—4 sometimes also fused into diffuse spots in the middle and near the apex, also lines 5—6 behind the middle. Head with fine, dense dots. Punctation of pronotum slightly more strongly marked near the anterior margin and before the base, but very scattered; disc almost smooth; lateral lines short, straight and shallow. Dots in rows on the elytra fine. Process of prothorax slightly tapering anteriorly with groove or rim, without dots in the middle, but with a row of coarse dots at the lateral margin, which form a weak ridge at the margin. Length 3mm. Male slightly shining; fore claws of different size; inner claw shorter and more strongly curved. Anterior half of penis slightly narrowed; dorsal side of penis almost straight to the middle, with a weak indentation and rounded apex. Right paramere slightly longer than left, but much narrower, pointed anteriorly, with a short, thin tuft of hairs at the apex and several hairs before the middle on the ventral margin. Elytra of female densely shagreened on the whole surface, with a silky sheen, as in Hvenpiecialirs Dist Gu Oulel On. WGeCure влекла: Ecology. Occurring in small marshes with Hypnum in the taiga (Poppius). *15. Haliplus (Haliplinus) schaumi Solsky. Solsky, 1867, Horae Soc. Entom. Ross., V:39; Zaitsev, 1906, Russkii entomologicheskii obzor, VI:170; Zimmermann, 1924:75; Scholz, 1929:13. Only the following differences from H.fluviatilis are mentioned in the original description of the species (which is rather short): pronotum slightly narrower anteriorly, the dark area at the outer margin of the elytra more reduced (elytra either uniformly reddish yellow, or with diffuse spots laterally). Length 2.25—2.5mm. Five specimens are in the collection of the Zoological Institute of the USSR Academy of Sciences; these specimens are presumably the original series; we studied them and have come to the conclusion that 4 of them are H.fulvicollis and one H.fluviatilis. We did not, unfortunately, study the male genitalia. Zimmermann examined a supposedly original specimen from the Munich Museum. In his monograph (1924) he comes to the conclusion that H.schaumi belongstothe group of H.fluviatilis, but it should be considered as a valid species which differs from H.flu- viatilis in the form of the penis: dorsal margin raised behind the middle in a blunt angle and not uniformly convex; there are no black lines on the elytra; dots in the first interval coarser, but slightly smaller than the dots in the primary (principal) rows. 58 59 Since these differences have been found only in а single specimen (original?), the status of H.schaumi remains uncertain until a more detailed study is made on new and larger material. Solsky described this species from Kozlov [now Michurinsk]; its distribution is not known. *16. Haliplus (Haliplinus) fluviatilis Aubé. Aube, 1836, Icon. Col., V:33; Ganglbauer, 1892:430 (partly); Kinel, 1922: 34,38; Zimmermann, 1924:76; Scholz, 1929:13; Csiki, 1946:563; Guignot, 1946:46.— maculatus Seidlitz, 1887:33 (not Mochul'skii). Oblong-oval, with slightly convex shoulders; pale yellow (rarely reddish yellow); vertex and anterior margin of pronotum dark; elytra with narrow, black or brown lines; only lines 1 or 1—2 reach the base; the other lines are shortened anteriorly and markedly interrupted behind the middle in rows 2—4 and they form 2 more or less distinct oblique stripes; these lines are rarely fused into spots (maculatus Seidl.); black lines very rarely more strongly developed, reaching the base without interruption; at the base of the elytra there is often a narrow, dark, diffuse stripe which passes to the ЕТСОВЕ'24. Haliplus fluviatilis pronotum in the form of a transverse Е st line. The elytra are widest behind the shoulders at '/4—'/3 of their length; the elytra gradually taper posteriorly. Lateral lines on pronotum very short, Я of its length, sometimes much shorter, in the form of a small pit. Dots in presutural interval much smaller than dots in rows, and arranged ina regular row. Process of prothorax flat or slightly convex, without lateral rim. Middle of metathorax with a pit or usually without a pit. Anal sternite less strongly punctate than in H.ruficollis. Hind tibiae and tarsi completely shagreened, without smooth areas. Length 2.5—3 mm. Fore claws of male of equal length, symmetrical, inner claw slightly shorter than outer and silightly thicker. First segment of mid tarsi with straight lower margin; the ventral margin has a slight indentation in H.ruficollis. Dorsal side of penis uniformly convex, without a hood. Right paramere (Figure 24) short, with bluntly rounded apex, its inner margin with a long, dense fringe of reddish yellow hairs which reaches the apex; the outer side of apex with a thin tuft of longer hairs. Elytra of female usually shagreened, except in a triangular space near the scutellum; whole surface of elytra rarely shagreened. This species differs distinctly from H.ruficollis in the more oblong, oval, less convex form of the body and in its lighter coloration; pronotum less short and spots on elytra absent. Distribution. Northern and central belt of the European USSR (this species becomes rarer in the south); Siberia, Transcaucasia (rare in the mountains). Northern and Central Europe, sporadically in southern Europe. 59 60 Ecology. This species prefers running water, or occurs at the banks of lakes with clean water. #17. Haliplus (Haliplinus) lineolatus Mnnh. Mannerheim, 1844, Bull. Soc. Nat. Moscou, XVII:190; Zimmermann, 1924:76; Scholz, 1929:13; Csiki, 1946:564; Guignot, 1947:46.-wehnckei Gehrhardt, 1877, Deutsch. Entom. Zeitschr., XX1:448; Ganglbauer, 1892:431; Kinel, 1922:34, 39; Lindberg, 1937, Acta Soc. Fn. Fl. Fenn., 60:482.— sibiricus Sahlberg, 1880, Sv. Vet. Akad. Handl., XVII:46 (not Mochul'- skii).— ? lindbergi Falkenstrom, 1939, Ark. zool., 32, No. 6:38. Oblong-oval, tapering gradually from the anterior third posteriorly like H.fluviatilis; sometimes slightly broader and more convex, 1.е., resembling H.ruficollis inform. Reddish yellow; lines on elytra dark brown; both inner lines reaching the base; outer lines shortened anteriorly, usually not interrupted behind the middle (at least the two inner lines), rarely fused into spots. Head covered with large but not very dense dots. ООО moderately short; lateral lines of pronotum at most We of its length, more sharply marked laterally and slightly curved in- ward; they usually pass into a small, flat, semicircular depression with coarse dots. Elytra with large dots in the rows, first dot of rows 3—5 slightly larger than the following; FIGURE 25. dots; in the presutural interval small and usually irregularly Haliplus scattered in the anterior third. Process of prothorax witha lineola- more or less distinct median groove at least in the ante rior tus Mnnh. half and with a lateral border. Middle of metathorax usually Sues pene with a large, shallow pit. pas Fore claws of male of different size; outer claw longer, thinner and less strongly curved than the inner. Penis short, bent at an almost right angle; apical third of dorsal side with a large hood. Right paramere (Figure 25) resembling that of H.fluviatilis, but tapering more uniformly toward the end and its wing-shaped appendage less developed. Shagreened surface of elytra of female slightly more delicate than in H.fluviatilis and is usually marked only in the outer and posterior half. Length 2.8—3.3 mm. Many characters are very variable. This species is often confused with H.fluviatilis. The coloration of this species is usually lighter than that of H.ruficollis (but darker than in H.fluviatilis); the darkening of the vertex near the anterior margin of the pronotum is slightly weaker, sometimes absent; the lateral lines on the pronotum are longer; the pre- sutural row of dots is more irregular near the base; black lines on the elytra not fused into spots. Punctation on the last two sternites finer, sometimes absent; shagreened texture of the hind tarsi slightly stronger, without smooth areas. However, a definitive identification can be obtained only by the study of the male genitalia, which differ sharply from those of Hy line olatus and Ho кот: ec ol lis: This species can be distinguished from. H.fluviatilis by the asymmetry of the fore claws of the male and the almost constant presence of a pit on the process of the mesothorax. 5917 60 61 Distribution. European USSR, Siberia, Transcaucasia (rare). Northern and Central Europe; Mongolia. Ecology. It occurs in ponds and puddles overgrown with vegetation, rarely in slowly running water. To this species and possibly also to H.sibiricus Motsch. presumably belongs also H. lindbergi Falk., which is known only from the brief original description (several males from northwestern Finland and northern Sweden). The description states that H.lindbergi resembles H.nomax (=transversus Thoms.) (without spots) in form, size, and coloration. As in H.lineolatus, the penis has a dorsal hood, but it is longer apically and resembles that of H.sahlbergi (=sibiricus Motsch.) more closely; left paramere of all3 species identical; rightparamere of H.lindbergi inter- mediate betweenthose of H.lineolatus and H.sibiricus; fringe of hairs оп the ventral margin reaching the apical seta and the margin projects in form of ап angle,as in H.sibiricus. In order to define the status of this form, it is necessary to make a more detailed comparative study of more material and to describe the female. *18. Haliplus (Haliplinus) interjectus Lindb. Lindberg, 1937, Acta Soc. Fn. Fl. Fenn., 60:487. Closely related to H.lineolatus, but differing in its darker coloration, in the slightly narrower and longer body (almost as in H.immaculatus), and in the shorter fringe of hairs on the right paramere, as in H.lineo- latus; this fringe does not reach the apex (which bears a spinelike process) but is interrupted before the apex (as in H.heydeni). Penis short, broad and blunt. Fore claws of male symmetrical; antennae uniformly reddish yellow; process of prothorax with a median groove (after Lindberg). Distribution. This species was described from 10 specimens from the vicinity of Vyborg (Leningrad Region). This is probably one of the forms of the very variable H.lineolatus; this species tends to form more or less marked local deviations from the principal form according to the specific conditions; these forms are difficult to distinguish and are connected by transitional forms. *19. Haliplus (Haliplinus) sibiricus Motsch. Mochul'skii, 1860, Schrenck's Reisen Amurl., II, 2:99; Sahlberg, 1880, Sv. Vet.-Akad. Handl., XVII, No. 4:46; Poppius, 1904—5, Oefv. Finsk. Vet. Soc. Forh., XLVII, No. 16:9; Zimmermann, 1924:76.—transversus Zaitsev, 1910, Zapiski imperatorskoi Akademii Nauk, (8) XVIII, No. 9:25 (пес Thoms.).— sahlbergi Falkenstrém, 1936, Ark. zool. 32, No. 6:32. Reddish yellow or yellow; antennae uniformly yellow, last antennal segment sometimes more or less black; rows of dots on the elytra connected by more or less long black lines which are usually broad; they are broken into isolated black spots or dots anteriorly and posteriorly; parts of the lines 5—7 sometimes so broad in their posterior half that they almost form spots; dots in the intervals also black; however, they do not have the dark border characteristic for H.immaculatus. Lateral lines 61 62 of pronotum moderately long, a third of its length. Process of prothorax with a weak longitudinal groove in the middle. Metathorax with a large irregular pit in the middle. Length 2.8-3mm. Fore claws of male of markedly different size; inner claw shorter, thicker, and curved at the end. Penis resembling that of H.lineolatus, the hood on the dorsal side more rounded, its upper part narrower and longer, and the apex symmetrically rounded and curved downward in side view. First segment of mid tarsi with straight ventral margin. Elytra of female finely punctate in the intervals between the rows, usually only in the outer half; this punctation is sparse and indistinct; however, the fine punctation is sometimes distributed on the whole surface (except in the prescutellar space); it is usually almost absent. Unlike H.lineolatus in which only the female has a delicate, fine punctation on the metathorax and on the hind coxae, both sexes of this species have such a fine punctation. The species differs from H.lineolatus inits smaller size and the broader, longitudinal, black lines onthe elytra; these lines are broader in the lateral parts, in the posterior half, until they become almost fused; the pattern of such specimens resembles that of H.ruficollis; such speci- mens differ from H.ruficollis in the form of the body and in the male genitalia. We identified erroneously (1915) the original specimen of Mochul'skii as a specimen of H.ruficollis. After comparison witha large series from various localities of Siberia, we clarified the synonymy of the species. We also consider H.sahlbergi Falk. as a synonym of this species; Falkenstrém assumed that the specimens from West Siberia identified by Sahlberg as H.sibiricus Motsch. belong toa different species. Falken- strém was apparently misled by inaccuracies in the description of H.sibiricus Motsch. in the monograph of Zimmermann. Falkenstrom re-examined the material of Sahlberg and gave a good description of H.sibiricus; however, he gave it а new name. Distribution. Northern Europe and Siberia. Among the distinctive characters of H.sibiricus, Zimmermann mentions the black last antennal segment in its apical third; this is un- fortunate. This character is not mentioned in the original description of Mochul'skii; this darkening is accidental according to our observations and should be considered as an individual variation. Thus,in a large series of H.sibiricus from Transbaikalia, we found only 2 specimens in which the last antennal segment was black to a varying extent. Such a darkening of the antennae has also been observed in other species of this genus; for example, there is a specimen of H.fluviatilis (from the Kalinin Region) in which several last antennal segmenta are dark; there are also 3 speci- mens of H.lineolatus (from the European USSR) with the following characters: one has the last antennal segments dark; in the second, all antennal segments (except the firsttwo) are black (with a bluish steel sheen), and in the third, the left fore tarsus and the right hind tarsus are black, in addition to the apical half of the antennae. All these are instances of melanism. Among the Russian species, the most constant darkening of the apical half of the antennae is observed in H.samojedorum Sahlb. and H.apicalis Thoms. On the other hand, there are specimens with light, uniformly reddish yellow antennae. 62 63 *20. Haliplus (Haliplinus) transversus Thoms. Thomson, 1869, Opusc. entom., П:124; Zimmermann, 1919, Arch. Naturg., 83:98; Guignot, 1947:47; female var. laevigatus Falkenstrom, 1936, Entom. Tidskr., LVII:252.— nomax Balfour-Browne, 1911, Entom. Monthl. Mag., XLI1I:153; Zimmermann, 1924:77; Scholz, 1929:14; Falkenstrém, 1936, Entom. Tidskr.:238; Lindbers, 937, Acta coc. Ни. Е1. Верп., 60:487.— browneanus Sharp, 1913, Entom. Monthl. Mag., 24:75.— lineolatus Csiki, 1946:564 (partly). Closely related to H.lineolatus, but more short-oval, narrower; sides of elytra more strongly rounded, tapering posteriorly only from the middle. Pronotum shorter and narrower; dots slightly denser at the anterior and posterior margin. Black lines on the elytra usually well marked, broad, less interrupted, sometimes very broad, almost fused in some places, rarely weakly developed, narrow; the two outer lines always slightly shortened anteriorly. Presutural row of dots more regular anteriorly. Process of prothorax with a more distinct groove. Length 2.5—3 mm. Fore claws of male almost symmetrical; inner claw slightly shorter, slightly thicker, slightly more strongly curved; the two claws of one leg sometimes equal, those of the other of different size. First segment of hind tarsi distinctly indented in side view at the ventral margin; last tarsal segment sometimes slightly curved at the base and its ventral margin markedly concave. Right paramere bluntly pointed anteriorly; its ventral margin with a fringe of long hairs. Penis markedly asymmetrical, narrower apically; its dorsal margin uniformly rounded, without a hood. Elytra of female distinctly shagreened and less shining than in the male. However, the elytra is rarely completely smooth, not shagreened, shining; dots in the presutural row situated closer together than in the typical form and more numerous (35 instead of 25). Distribution. North of European USSR, Siberia. Northern and partly Central Europe. Ecology. A lacustrine species, occurring in clean water bodies, rarely in water bodies slightly overgrown with vegetation, with a sandy or stony bottom. *21. Haliplus (Haliplinus) immaculatus Gehrh. Gehrhardt, 1877, Deutsch. Entom. Zeitschr.:38; Kinel, 1922:35; Zimmer- mann, 1924:78; Scholz, 1929:12; Csiki, 1946:564; Guignot, 1947:47.— flavus Everts, 1912, Tijdskr. Entom., LV:100; Falkenstrom, 1926, Entom. Tidskr., 47:1—28; Bertrand, 1950, Bull. Soc. ent. France, 55:46. This species differs from the other species of the fluviatilis group in its short lateral line on the pronotum and especially in the constant presence of black lines on the elytra; these lines are broad and uninterrupted, and reach or almost reach the apex; the two outer lines are shortened anteriorly; there are no black lines in H.flavus Everts, and this is apparently an abnormal specimen. The body is more oval than in H.fluviatilis. The dots in the rows are well developed; the 2 inner rows 63 64 are often distinctly depressed, forming grooves; first dots of rows 3—5 distinctly larger than the others; dots in the intervals scattered, black at the bottom; they also always have a narrow black margin. Presutural row of dots irregular in the anterior half. Process of prothorax with a weak groove in the middle, with a narrow, low brownish ridge laterally. Length 2.7—3.1 mm Inner claw of fore tarsi of male strongly curved, thicker, 7/3 as long as the outer. First segment of mid tarsi with almost straight ventral margin. Penis strongly curved, with parallel sides apically; its dorsal side with a large hood posterior to the middle. Right paramere (Figure 26) FIGURE 26. Haliplus immaculatus bluntly pointed anteriorly, with a spinule Gehrh. Parameres. at the apex, oblong, with convex dorsal side; its ventral margin with an indentation in the middle within which is a short fringe of dense blunt setae which are longer toward the apex. Elytra of female not shagreened, shining. Distribution. Northern and central belt of the European USSR, Siberia. Northern Europe and some localities in Central Europe. Rare and sporadically distributed. Ecology. It was found only in brackish puddles at the seashore in Finland (Lindberg). 22. Haliplus (Haliplinus) alsaticus Scriba. Scriba, 1905, Deutsch. Entom. Zeitschr.:337; Zimmermann, 1924:78; Scholz, 1929:11.— holsaticus Reitter, 1908:204. This species differs markedly from the other species in its coloration: body completely black, strongly shining; only head, mouthparts, and legs chestnut brown or reddish brown. Head broad, covered with strong, dense dots; dots more scattered in the middle; eyes with indistinct, weakly developed facets. Pronotum covered anteriorly and posteriorly with dots like the head; almost smooth on the disc; lateral lines long, reaching beyond the basal third of the pronotum, slightly curved. Process of prothorax with a weak groove, with strong, dense dots. Metathorax with a weak depression in the middle. Length 2.8 mm. Penis short, convex, broadly rounded anteriorly, with a curled hood on the concave dorsal side. Right paramere bluntly pointed anteriorly; apical half of the weakly concave ventral margin with moderately long, dense hairs. Fore claws of male asymmetrical; fore and mid femora thick. Elytra of female shagreened. Distribution. France: Alsace. 64 65 4. Subgenus Liaphlus Guignot Guignot, 1928, Ann. Soc. Entom. Fr.:133; same author, 1947:48; Csiki, ВО 6558, — тар bluse Opel he Sakunel 1929:219. Туре species: Hoplites fulvus (Fabr.). Inner side of hind tibiae with a narrow longitudinal groove with dots, each dot with a small hair. Pronotum with a transverse row of large dots at the base, without lateral lines. Parameres of male with a more or less long finger-shaped appendage at the apex; in the female, spaces between the rows of dots on the elytra of all species smooth, with more or less sparse fine dots, but without continuous fine punctation; these spaces weakly punctate опа Hat Lavi collics. Key to Species* 1 (30). Pronotum relatively long, at most twice as broad at the base as long. 2 (3).. Metathorax straight in the middle. Head large, slightly broader than half the width of base of pronotum; frons broad. Anterior margin of pronotum projecting anteriorly in the middle. Elytra of uniform color, without dark spots. Large (to4mm)........ оон alsa a Aaah ih a 23. H.(L.) mucronatus Steph. 3 (2). Metathorax almost always with a pit or a shallow depressioninthe middle. Head small. Anterior margin of pronotum straight in its greater part. 4 (9). Black spots or broad black lines on the elytra absent; elytra either of uniform color or with thin, more or less short dark dashes along the rows of dots. Dots of middle rows larger at the base of the elyita, slightly pitlike’ еее. %24. H.(L.) laminatus (Schall.) . 5 (8). Dots on pronotum black at the bottom. 6 (7). Body longer and narrower; dots in the rows on the elytra larger; PLesutUta interval MmatkeGdiy, DROME ne. cic csMescd Coelambus mongolicus Jak. Hydroporus punctatissimus Popp. H. breviusculus Popp. H.saghalienus Tak. Н, laticollis Zimm. Oreodytes dauricus (Motsch.) Neoporus jakovlevi Zaitz. Gaurodytes sharpi (Jacobs.) G.sachalinensis Kam. G.costulatus Motsch. С. aequalis Sharp. G. kurilensis Kam. Agabus clavicornis Sharp Ilybius poppiusi Zaitz. I, obtusus Sharp. 1. ovalis Gschw. Г. lateralis Gebl. Colymbetes dahuricus Aubé С. 10111 Zaits. Hydaticus laeviusculus Popp. H. rugosus Popp. Dytiscus delictus Zaitz. р. czerskii Zaitz. D. latro Sharp 87 87 У Восеоз рее werss This group is the largest; they live in the taiga and insular forests of Eurasia, in the plains; they occur in the northern and central belt of the European USSR, in Siberia (except in the south), and in the highlands of the Caucasus; they occur in Northern and Central Europe to eastern France and northern Italy: Hygrotus decoratus (Gyll.) H. versicolor (Schall.) H. quinquelineatus (Zett.) Coelambus polonicus (Aube) С. marklini (Gyll.) Bidessus unistriatus (Schr.) >В. grossepunctatus Vorbr. Hydroporus angustatus Sturm. .scalesianus Steph. - piceus Steph. -umbrosus (Gyll.) -hotatus Sturm .incognitus Sharp -striola (Gyll.) -obscurus Sturm -elongatulus Sturm melanocephalus Mrsh. . tartaricus Lec. -memnonius Nic. -nheglectus Schaum melanarius Sturm Laccornis oblongus (Steph.) Graptodytes pictus (Fabr.) Gr. granularis (L.) Gr. bilineatus (Sturm) Oreodytes borealis (Gyll.) Or. septentrionalis (Gyll.) Or. rivalis (Gyll.) Deronectes latus (Steph.) Potamonectes assimilis (Payk.) Pot.depressus (Fabr.) Gaurodytes biguttatus Oliv. G. melanarius (Aubé) G. nigroaeneus (Er.) G. subtilis (Er.) BE ely) ey tel ey ee 59 25 ey 95 VI. Mediterranean elements form three subgroups: A) species which are widely distributed throughout the Mediterranean (Southern Europe, North Africa, Asia Minor); B) east Mediterranean species (Balkans, Asia Minor, Syria, western Iran); C) West Mediterranean species are not The first two subgroups occur in Russia in the same range, south of the European USSR, plains of Transcaucasia, represented in the Russian fauna. Turkmenia: G. neglectus (Er.) G.unguicularis Thoms. G. affinis (Payk.) G. biguttulus Thoms. G. paludosus (Fabr.) G. uliginosus (L.) 2G. jacobsoni Zaitz. С. sturmi (Gyll.) G.clypealis Thoms. G. pseudoclypealis Scholz G. confinis (Gyll.) С. fuscipennis (Payk.) Eriglenus undulatus (Schr.) Ilybius ater (Deg.) I. quadriguttatus Boisd. et Lac. I. similis Er. I. guttiger Gyll. I. angustior Gyll. 1. aenescens Thoms. Rhantus notatus (Fabr.) Rh. notaticollis Aubé Rh. latitans Sharp Rh. grapei (Gyll.) Colymbetes paykulli Er. C. striatus (L.) Hydaticus seminiger (Deg.) Н. laevipennis Thoms. H. transversalis (Pontop.) Graphoderes bilineatus (Deg.) Gr. zonatus Hoppe Acilius canaliculatus Nic. Dytiscus latissimus Г. О. lapponicus Gyll. D.circumcinctus (Ahr.) 88 88 Subgroup А Laccophilus variegatus Germ. Hydrovatus cuspidatus (Kunze) Bidessus signatellus (К1.) Hypophorus musicus (К1.) Coelambus parallelogrammus (Ahr.) C.lernaeus (Schaum) C.confluens (Fabr.) C. pallidulus (Aubé) Hydroporus marginatus (Duft.) H. tessellatus Drap. Scarodytes halensis (Fabr.) Potamonectes ceresyi (Aubé) Subgroup B Bidessus confusus (К1.) Hydroporus jonicus Mill. Deronectes parvicollis (Schaum) Potamonectes variegatus (Aubé) Рог. turca (Seidl.) Copelatus haemorrhoidalis (Fabr.) Gaurodytes dilatatus (Br.) G.chalconotus (Panz.) С. melanocornis Zimm. G. nebulosus (Forst.) С. conspersus (Mrsh.) Hydaticus leander (Rossi) H. grammicus Germ. Dytiscus semisulcatus Mull. D.dimidiatus Brgstr. D.circumflexus Fabr. Cybister lateralimarginalis (Deg.) Gaurodytes caraboides Sharp Platambus lunulatus (Stev.) Dytiscus persicus Sharp Cybister tripunctatus Ol. The following species, described from the highlands of the Caucasus, and the species of subgroup B apparently have neighboring ranges: Coelambus armeniacus Zaitz. Hydroporus mtiula Zaitz. H. kozlovskii Zaitz. Н. jacobsoni Zaitz. Deronectes doriai Sharp Gaurodytes glacialis (Hochh.) Coelambus koenigi Zaitz. Subgroup B possibly also includes H.ampliatus Zaitz. from the Black Sea coast of Georgia and Hydaticus schelkovnikovi Zaitz. whichis common in eastern Transcaucasia. МТ. Ире сте 5 sof thievsteppe zone of the huropeans US ok; Western Srberia, northern Kazakhstan, eastern Lrans- caucasia, Turkmenia (some species of this group are distributed to Hungary and Austria in the west): Bidessus nasatus Sharp Bidessus alienus Zimm. Coelambus corpulentus (Schaum) C.saginatus (Schaum) C.nigrolineatus (Stev.) C.caspius (Wehncke) C.enneagrammus (Ahr.) С. pectoralis (Motsch.) C.flaviventris (Motsch.) Porhydrus obliquesignatus (Bielz.) Deronectes vestitus (Gebl.) 89 Gaurodytes faldermanni Zaitz. С. amoenus (Sols.) С. slovzovi Sahlb. G.lineatus Gebl. С. desertorum (Mor.) Eriglenus fulvaster Zaitz. Ilybius cinctus Sharp Rhantus rufus Zimm. Rh. consputus (Sturm) Colymbetes semenovi Jak. Graphoderes austriacus (Sturm) VIII. Turanian species (mountains of Middle Asia, Sinkiang, Tien Shan): Laccophilus apicicornis Rttr. Gaurodytes basalis Gebl. Coelambus urgensis Jak. G.glazunovi Zaitz. C.uzbekorum Zaitz. С. solskyi (Jak.) @оТЕШОНЕ аще а С. dichrous (Sharp) Hydroporus goldschmidti Gschw. G. friedrichi Falk. Deronectes abnormicollis Sem. G. aequabilis Gschw. D. longipes Sharp С. semenovi Jak. Hydroporus glazunovi Zaitz. С. sogdianus Jak. Potamonectes formaster (Zaitz.) Hydronebrius cordaticollis (Reitt.) Р. sulphuricola (Zaitz.) Dytiscus tianshanicus Gschw. Р. stearinus (Kol.) Potamonectes airumlus Kol. has avery characteristic distri- bution and has a special position; this species is probably of Middle Asiatic origin; it is widely distributed: from Asia Minor, Syria, Transcaucasia to Kashmir and Yunnan, and from the Kiev and Saratov regions through Central Asia to Peking. IX. Species entering the USSR (into the southern Maritime Territory) from Korea, China and Japan, i.e., from the Palearchearctic subregion: Noterus angustulus Zaitz. Gaurodytes optatus Sharp Laccophilus vagelineatus Zimm. ?С. aequalis Sharp L. lewisius Sharp Platambus fimbriolatus Sharp Bidessus japonicus Sharp Ilybius apicalis Gebl. Coelambus vittatus Sharp Graphoderes bieneri Zimm. Neonectes jakovlevi Zaitz. Dytiscus dauricus Gebl. Potamonectes hostilis (Sharp) Cybister japonicus Sharp Copelatus japonicus Sharp Bibliography Yakobson,G.G. Zhuki Rossii i Zapadnoi Evropy (The Beetles of Russia and Western Europe), No. 4:414—436. 1907. Zaitsev,F.A. Zhuki vodolyuby Sankt Peterburgskoi gubernii (Aquatic Beetles of Saint Petersburg Province). — Ezhegodnik Zoologicheskogo Muzeya Imperatorskoi Akademii Nauk, Vol. 12:1—33. 1907. Zaitsev, F.A. K faune vodyanykh zhukov Kievskoi gubernii (The Fauna of Aquatic Beetles of Kiev Province).— Trudy Russkogo Entomolo- gicheskogo Obshchestva, Vol. 38:157—163. 1907. Zaitsev,F.A. K faune vodyanykh zhukov Kryma i Tamani (The Fauna of Aquatic Beetles of the Crimea and Taman). — Ezhegodnik Zoologiches- Кобо Muzeya Akademii Nauk, Vol. 8:1—8. 1908. Zaitsev, К.А. Neskol'ko fenologicheskikh nablyudenii nad vodyanymi zhukami i pr. (Phenological Observations on Aquatic Beetles, etc.).— Russkoe Entomologicheskoe Obozrenie, Vol. 9:57—64. 1909. 90 89 Zaitsev, Е.А. Vodyanye zhuki kollektsii Mochul'skogo (Aquatic Beetles of the Collection of Mochul'skii). — Ezhegodnik Zoologicheskogo Muzeya Akademii Nauk, Vol. 20:239—295. 1915. Zaitsev,F.A. Plavuntsy Kavkaza (Water Beetles of the Caucasus). — Raboty Severo-Kavkazskoi Gidrobiologicheskoi Stantsii, 2(1):1—42. 1927. Гат вех, Е.А. Materialy К faune vodyanykh zhukov Saratovskoi i Samars- koi gubernii (Data on the Fauna of Aquatic Beetles of the Saratov and Samara [now Kuibyshev Region] Provinces). — Raboty Volzhskoi Biologicheskoi Stantsii, 10(1):1—27. 1928. Zaitsev,F.A. Zametki o vodyanykh zhukakh basseina reki Severnogo Dontsa (Notes on the Aquatic Beetles of the Basin of the Northern Donets River). — Trudy Kharkivs'koho Tovarystva Doslidzhennya Prirody, Vole o2s2 (0-200. 1929} Zaitsev, Е.А. Vodyanye zhuki Turkmenistana (Aquatic Beetles of Turkmenistan). — Trudy Murgabskoi Gidrobiologicheskoi Stantsii, То. 153—176. 1951: Zaitsev,F.A. Vodnye zhestokrylye у faune Gruzii (The Aquatic Coleop- tera of the Fauna of Georgia). — Trudy Zoologicheskogo Instituta Akademii Nauk Gruzinskoi SSR, Vol. 11:87—125. 1952. Bertrand,H. Les larves et nymphes de Dytiscidae.— Encycl. entom., VOLCOM 189. 13107323... 1928: Csiki,E. Die Kaferfauna des Karpathen-Beckens, Vol.1:572. 1946. Ка 1 Кепз{гоза, а. Schwedisch-chinesische wissenschaftliche Expedition nach den nordwestlichen Provinzen Chinas. 15. Haliplidae u. Dytiscidac:— An. t. ZOOlh, «20 Ay Мо. 1:1. 1933. Falkenstr6ém,G. Haliplidae, Dytiscidae und Gyrinidae aus West- und Zentral-China. — Lingn. Sc. Journ., 15(1):79—99, 225—248, 647. 1936. Ganglbauer,L. Die Kafer von Mitteleuropa, Vol. 1:439. 1892. Gschwendtner, Т. Einiges tber Ostturkestan und dessen Dytisciden- fauna. „Асов. Natunsesch., ,GON, 8:93. 1925. Gschwendtner, L. Monographie der palaarktischen Dytiscidae. Colymbetinae (2 Teil). Reitter, Bestimm.-Tab., 114. 1935. Gschwendtner, L. Monographie der palaarktischen Dytisciden. VII. Colymbetinae.— Koleopt. Rundschau, No. 22:61—80. 1936. Gschwendtner, L. Monographie der palaarktischen Dytisciden. VIII. Dytiscinae. — Koleopt. Rundschau, No. 23:73—92. 1937. Gschwendtner, L. Monographie der palaarktischen Dytisciden, IX. Dytiscinae.— Koleopt. Rundschau, No. 24:33—76. 1938. Gschwendtner,L. Monographie der palaarktischen Dytisciden. X.— Koleopt. Rundschau, No. 25:23—69. 1939. Guignot, F. Coléoptéres hydrocanthares.— Faune de France, No. 48: 54—249. 1947. Kinel,J. Hydradephaga Polski. I. Coelambus.— Kosmos, 58(1—4):198. 1933. Kinel,J. Hydradephaga Polski. Ш. Deronectes.— Polsk. pismo entom., 8(1—4):198. 1934. Régimbart,M. Revision des Dytiscides de la région indo-sinomalaise. — Ann. Soc. entom. Fr., Vol. 68:186. 1889. 91 90 Вей! тЬаг%, М. Dytiscidae et Gyrinidae d'Afrique et Madagascar. — Mem. Soc. entom. Bel., Vol.4:244. 1895. Reitter,E. Untersuchungen uber die ausseren mannlichen Gonapophysen der palaarktischen Dytisciden u. a. 1942. Scholz, М. Beitrage zur Kenntnis und Verbreitung europaischer Wasser- kafer.— Entom. Blatt., No. 10—12:232. Seidlitz,G. Bestimmungstabellen der Dytiscidae und Gyrinidae des europaischen Faunengebietes.— Verh. naturf. Ver. Briinn., Vol. 25: ЕЛЬ IMI Sharp, О. On Aquatic Carnivorous Coleoptera or Dytiscidae.— Trans. В. Dublin Soc., Vol. 2 (ser. 2):179—1004. 1880—1882. Zaitsev,Ph. Beitrage zur Kenntnis der Wasserkafer des Ostens von Nordsibirien.— Zapiski Imperatorskoi Akademii Nauk,(8) 18(9):11—52. OOP Zimmermann,A. Die Schwimmkafer des deutschen entomolog. Museums in Berlin-Dahlem. — Arch. Naturgesch., 83 А, 12:68—249. (1917) ЛО. Zimmermann, А. Monographie der palaarktischen Dytiscidae. I. Noterinae, Laccophilinae, Hydroporinae. Reitter's Bestimm-Tab., 99 Heft, 1930; Il. Hydroporinae (2 Ten) Ibid., 101 Heft, 1931; Ш. Hydroporinae (3 Teil), Ibid., 103 Heft 1932; IV. Hydroporinae (4 Teil), Ibid., 111 Heft, 1933; V. Colymbetinae (1 Teil), Ibid., 113 Heft, 1932. 1930. Key to Subfamilies 1 (6). Scutellum completely covered or only its end visible. 2 (5). Fore and mid tarsi distinctly 5-segmented, 4th tarsal segment almost as long as third, distinct. Inner lobes of hind coxae their whole length or at least posteriorly raised above the outer lobes. Episterna of metathorax not reaching depressions of mid coxae. Base of prothorax situated in the same plane as process of pro- thorax. Parameres of male asymmetrical. 3 (4). Inner lobes of hind coxae raised above the outer lobes their whole length; they are expanded laterally into plates which cover the groove, extend far anteriorly and contain the femora. Sides of pro- notum with a rim. Posterior margin of hind tarsi straight; last segment with two equally long, curved claws. Lateral wings of metathorax very large; posterior processes obliquely truncate ... ее и 1. Subfamily Noterinae. 4 (3). Inner lobes of hind coxae situated in the same plane anteriorly as the outer lobes; they are distinctly raised near the truncate posterior margin. “Sidestof pronotum without im!) 70. © eee eee aN Sn tS netics! Yess art cee. В р 2. Subfamily Laccophilinae. 5 (2). Fore and mid tarsi apparently 4-segmented; 4th segment usually covered by the indentation of the 3rd segment and not visible. Inner lobes of hind coxae not raised also on the posterior margin. Triangular episterna of metathorax usually reaching depressions of mid coxae. Parameres of males symmetrical. Prothorax 5917 92 91 В) convex between anterior сохае; process of prothorax more or less strongly curved posteriorly, and therefore not in the same plane as base of prothorax "2.7... 3. Subfamily Hydroporinae. Scutellum not covered, completely visible. Whole prothorax situated in one plane. Anterior margin of eyes slightly indented behind the antennae because the blunt process of the clypeus is situated on Ц. First 3 segments of fore tarsi of male broadened but not forming true adhesive discs. Prothorax usually slightly compressed laterally, VYonvitudinally keel-sShaped or slightly Convex <2 + «1.6 ss sete ss WibR OR OGL Chas Ооо ot ere tAgO RUA E Ro tes 4. Subfamily Colymbetinae. Anterior margin of eye not indented. First 3 segments of fore tarsi of male expanded into round or transversely-oval adhesive discs. Whole prothorax uniformly broad, almost flat, not laterally COA OESISSCly ес. 5. Subfamily Dytiscinae. Key to Genera (Mature Larvae) (20). 2 3 Frons with a horn or process. Body very short, very broad, and flattened. All abdominal sternitesestronglyrsclerotizedsinetheim окежес рав: ее... Seer SEARO о пемь Е ов О ОИ 5. Hydrovatus Motsch. Body slender; abdominal sternites sclerotized only from the 4th or from the 6th or 7th sternite. Body spindle-shaped, markedly swollen in middle. Frontal horn very long. Labium very long and narrow...... 4. Hyphydrus 11. Body slender; frontal horn moderately long or very short. Labium. short, slightly triangular. Head narrow; maximal width almost like the distance from the base to the antennae. Frontal horn with a deep groove and a О ео aren ate Oak AON ene оао 9. Hygrotus Steph. Head broad; maximal width larger than distance from base to antennae. Frontal horn tapering apically, with a deep lateral indentation and with a strong denticle behind it. Cerci with 7 and more setae, with or without natatorial setae on the sides of the last segments ..... we sis se) due Coetambus Lhoms.: Cerci with 7 setae. Natatorial setae absent. Body with longi- tudinaliabrown аванс 14. Graptodytes Seidl. Frontal horn with a shallow indentation or without indentation; denticle behind it weakly marked or absent. Cerci with 7 setae. Proxima setae, Of Cerel situated Close LOsSetner’., ее. о ее 6. Bidessus Sharp. First proximal seta situated far from the two following setae оао te Velen ооо ооо 12. Hydroporus Clairv. Cerci with more than 7 setae. Cerci short; legs without natatorial setae. .. 19. Deronectes Sharp. Cerci long or very long. 93 92 Frontal horn with almost parallel sides or slightly broader at base. Lessnwith mavatomlalySetae ое 21. Potamonectes Zimm. Frontal horn distinctly broader at the base. Legs with or without NatabOrialsse vac wr cuter ame nei не ie 16. Oreodytes Seidl. Frons without process or horn, uniformly rounded. Head swollen, conical; mouth open; neck absent. Legs fossorial Uh bape ics EAU fa hon banat de Alecia te ares) Же era oli Ra ей 1. Noterus Clairv. Head flattened; mouth closed; neck more or less distinct. Legs natatorial and ambulatorial. Head usually rounded in dorsal view; palps and antennae normal, without accessory segments. Body long; legs long and delicate; temples with few (3—5) strong spinules. Frontal tubercle absent ...... 3. Laccophilus Leach. Body more or less broad. Legs often short; temples with numerous short spinules interspersed with long ones. A weak frontal tubercle present. Anal sternite membranous. Last antennal segment bifid, i. e., third segment with 2 small segments at the apex. Legs without nata- пота ведает Gh SEL OARS te. ооо 23. Copelatus Er. Anal sternite completely sclerotized except at the apex. Antennae normal. Fourth segment simple. Natatorial setae present or absent. Last antennal segment short, rarely slightly more than half as long as the preceding segment. Setae of cerci arranged in two groups (3 proximal setae and 4 distal setae). (Agabini). Anal tergite not projecting above the cerci, truncate. Proximal setae of cerci widely separated from the other setae ........ SUH Bean ee teen а Sled of lth Aaie) уро tc Lamm DUC Mn Oras. Anal tergite more or less projecting above the cerci, Mandibles short, less than twice as long as broad. Maxillae with 2 hooks on the inner margin. Legs without natatorial setae ......... 24. Gaurodytes Thoms. MESS WathinatcarOnladlySeLac и ое 25. Eriglenus Thoms. Mandibles more than three times as long as broad. Maxillae with or without hooks. Head more or less square .......... а Е ВИ, ПОМ, ESTA EU MUAY bs hinge syle са 9 Diy bis aha, Last antennal segment long, almost as long as the preceding segment. Setae of cerci not forming groups. Legs with nata- torial setae (Colymbetini). Temporal angles almost straight, sides of temples parallel. Claws Without stad les atiiie: basen | wail ieee и 31. Rhantus (Nartus). Temples rounded. Claws with distinct spinules at base of inner margin. Mandibles almost’3 times’as longiias broad, 1. ыыы: AURA OLR а op cen akin Apt cal ap Sun Rs 31. Rhantus (Rhantus) Lac. Mandibles short, slightly more than twice as longas broad ..... О оао 32. Colymbetes Clairv. Head distinctly triangular. Antennae and palps with accessory segment. Natatorial setae on legs and last (or penultimate) tergite. (Dytiscini). Clypeus truncate. Cerci distinct. 94 93 42 (47). Body humpbacked; cerci without natatorial setae. aon (44) | Пса вбок, ме А ара е а ее. 33. Eretes Cast. 44 (43). Ligula long, without spinules. 45 (46). Ligula simple, longer than first palp segment .............. ae ogee ео las crine dar 35. Graphoderes Thoms. AUS: (CERN, GERD, (ESRC LY оо are ere 36. Acilius Leach. 47 (42). Body not humpbacked. 48 (49). Labium with ligula. Cerci without natatorial setae .......... вов Во Ва ь ООВ оо ооо le ор аи > ФО 34. Hydaticus Leach. 49 (48). Labium without ligula. Cerci with natatorial setae .......... соо в alo a 6 sige AIA SE We ce ее ЗО Фумзеаа М. 50 (41). Clypeus triangular. Head with denticles at the anterior margin. Cerci rudimentary, not visible in dorsal view .. .38. Cybister Curt. 1. SUBFAMILY NOTERINAE Régimbart, 1878, Ann. Soc. Ent. Fr. (5) VIII:450; Zimmermann, 1930:4; Guignot, 1947:157. Fore and mid tarsi distinctly 5-segmented; posterior margin of hind tarsi straight; last segment with 2 thin, curved claws of equal length. Lateral wings of metathorax large; posterior processes of metathorax obliquely truncate. Male. First 3 segments of fore tarsi more or less broadened and with several ventral papillae. This subfamily contains 4 tribes; 2 of them are represented in the Palearctic Region. Key to Tribes 1 (2). Process of prothorax rounded apically. Inner apical angle of hind femora either without setae or with only a few setae. ...1. Noterini. 2 (1). Process of prothorax broad apically, truncate. Inner angle of hind femora with a linear fascicle of red setae ...... 2. Hydrocanthini. 1. Tribe NOTERINI Sharp, 1880—1882:267; Zimmermann, 1930:4; Guignot, 1947:158. Process of prothorax with rounded apex; processes of metathorax divided by a deep angular indentation into 2 lobes. Outer spur of fore tibiae strong and curved. The tribe contains 4 genera, only one of which is represented in the Palearctic Region. 95 94 1. Genus Noterus Сашу. Clairville, 1806, Helv. Ent., П:222; Ganglbauer, 1892:479; Zimmermann, 1930:6; Csiki, 1946:580; Guignot, 1947:158. Type species: Dytiscus clavicornis (Deg.). Body flat ventrally, strongly convex dorsally, maximal width before the middle, narrowing posteriorly, strongly shining, bare, reddish brown, without distinct spots. The very characteristic sculpture consists of thin, parallel, undulate, longitudinal lines which are repeatedly connected, forming elongate loops on head and pronotum. Head short; anterior margin of clypeus with a weak indentation. Prono- tum broadest at the base, strongly narrowed anteriorly, with a broad lateral rim (the inner margin a b of which is not parallel to the lateral margin but converges with it posteriorly; anterior angles rounded; posterior angles almost right, slightly extending to а Noterus crassicot- ‘the elytra. Antennae (Figure 39) different in both nis Mull.; b —Noterus elavicornis Deg. sexes: those of the female short and moderately thick, those of the male thickened and their middle segments broadened to a different extent in the various species. Maxillary palps: first segment very small, segments 2—3 longer, and segment 4 as long as the two preceding segments; segment 4 truncate or jagged apically. Labial palps with a long apically thickened last segment which is also jagged at the end. Epipleura of elytra very broad, with a well-marked groove anteriorly, narrowing from the first abdominal tergite. Prothorax either slightly keeled or weakly convex before the fore coxae; its process broad and flat, bluntly triangular posteriorly or rounded- pointed, with a lateral rim. Inner lobes of hind coxae raised in form of plates, with a deep longitudinal line in the middle; this line continues to the metathorax; these lobes have 2 lateral divergent posterior processes. Front femora thick, with a longitudinal groove on the ventral side in which the tibiae are placed. In the male,the inner margin has a strong, blunt denticle in the middle which is absent in the female. Fore tibiae with short, dense cilia on the outer margin and at the apex; tibiae of male much broader than in the female, especially anteriorly, with a blunt denticle in the middle, with rounded apex, and with a long, slightly curved spur plus another shorter and straighter spur. First segment of fore tarsi large, longer than the following 3 segments together, broad, strongly broadened in the male, especially apically, with a fringe of cilia at the anterior margin and a large ventral papilla; 2nd segment less broad; 3rd segment even less broad; both with 2 or 3 smaller, rounded papillae. The thin mid and hind tibiae with a crown of short and dense cilia at the apex. Hind femora with a row of dots with short golden-yellow hairs at the inner margin. Hind tarsi relatively thin; first segment longer than the following two segments together; last segment with 2 small, thin claws of equal length. Parameres of the male asymmetrical: right paramere more pointed and shorter than the left. Penis slightly twisted on its axis near the base. FIGURE 39. Antenna: 96 95 tH И АЙ (F FIGURE 40. Noterus clavicornis Deg. Larva, Larva (Figure 40) known only for N.clavicornis. Head swollen, with rounded anterior margin; antennae thick, 4-segmented; maxillary palps with a distinct network. Eighth abdominal segment conical, tapering at the end and with a short process. Cerci cylindrical, thick, not reaching beyond the terminal process, with 6 setae, Legs short and strong. Both larvae and adults live in stagnant, slightly marshy water. The genus Noterus is Holarctic and contains 6 species. Key to Species 10 (10). Body smooth, markedly shining. (5). Prothorax of male flat or slightly compressed longitudinally, slightly raised in the female, but without median keel. Antennal segments 5—6 of male distinctly broader than the following segments. Each elytron with 2 longitudinal rows of deep dots; similar impressed dots also scattered in the posterior half. Body broader....... PSR ETON Be TRIE FD Pe RRS? CAE BY *1. N.crassicornis (Mull.). (3). Dots in longitudinal rows very small; very few scattered dots in the posterior half, which are hardly recognizable. Narrower is ea ALD Ar Gee BO ee ap SER Ae ad PC *2,. N.angustulus Zaitzev, sp.n. (2). Prothorax with a more or less distinct median longitudinal keel before the fore coxae. (7). Elytra with 3 longitudinal rows of dots; posterior half with scattered large dots which are deeply impressed at the anterior margin and are bifid like a horseshoe. Middle segments of antennae of male slightly broader than the following ......... а ae’ cess Minha CAs AT le ORAM cry *3. N.clavicornis (Deg.). (6). Except for 3 slightly irregular rows of dots, posterior half of elytra without dots or almost without dots. (9). Antennae of male moderately broadened; segments 5—10 almost of the same Нос ава length 2) iio... ине 5. М. japonicus Sharp. (8). Antennae of male strongly broadened; antennal segment 10 with а lobeyat the, outer Japica L.COnNe ry а. 4. М. ponticus Sharp. О) sDonsumic ranilatcry. eau aces оо ey wae 6. М. granulatus Reg. *1, Noterus crassicornis (Miill.) Ph. Muller, 1776, Zool. Dan. Prodr.:72 (Dytiscus); Ganglbauer, 1892:480; Zimmermann, 1930:7; Csiki, 1946:582; Guignot, 1947:161; ab. simulator Porta, Guignot, 1947:161. 97 96 Elytra with 4 well marked, irregular rows of dots; these rows are partly confluent in the posterior half; the dots are sometimes smaller and more widely separated toward the apex (ab. Simulator Porta). Dorsum uniformly reddish yellow; elytra brownish; venter of male of the same color as the dorsum; in the female, sides of head, prothorax, and apex of fore and mid tibiae black. In the male, antennal segment 5 large, almost square, and twice as broad as segment 4; its inner apical angle blunt, its outer angle pointed; segment 6 is as broad as segment 5, but half as long, with an outer lobe, hollowed like a trough ventrally, like segment 5. The 4 following segments almost of equal length, short and much narrower than segment 6, tapering; terminal segment pointed. Prothorax of male flattened or slightly concave, slightly convex in the female, its anterior margin projecting in the middle, rounded; process of prothorax triangular, blunt posteriorly.. Length 3.5—3.7 mm. Distribution. USSR: European part, Siberia. The greater part of Europe (?China, recorded by Guignot). *2. Noterus angustulus Zaitzev, sp.n. Closely related to N.crassicornis differing from it in the form of the body which is narrower near the shoulders; antennal segment 5 of male almost triangular, less than half as wide at the base at the apex; segment 6 much shorter than ш N.crassicornis. Punctation of elytra as in the west Mediterranean species N.laevis St.,i.e.,the rows of dots are very thin; scattered dots in the posterior half very few, hardly recognizable. Coloration of elytra usually not uniform, brown and divided into longitudinal columns of broad, almost quadrangular spots which are darker than the background (this is rarely also observed in N.crassicornis). Other characters, especially the structure of the prothorax,as in N.crassi- cornis. The species differs more markedly from N.japonicus Sharp, in the narrow body, smaller size, and different structure of antennae of male and of the prothorax. Length 3.5—3.9 mm. Distribution. USSR: Maritime Territory (Khanka Lake, Khasan Lake, Tumen River, Sedanka River, July—August, 40 specimens). *3. Noterus clavicornis (Deg.). De Geer, 1774, Mém. Hist. Ins.,1V:402 (Dytiscus); Ganglbauer, 1892: 480; Zimmermann, 1930:7; Csiki, 1946:582; Guignot, 1947:160; var. con- vexiusculus Reiche, 1855, Ann. Soc. Ent. Fr., (3), III:640. Larger and darker than N.angustulus. The irregularly scattered dots inthe posterior half are coarse; their anterior margin is more strongly impressed and bifid in form of a horseshoe. Specimens with weaker dots occur in southeastern Europe and in Middle Asia (var. convexiusculus Reiche). Prothorax of male and female with a weak keel; middle of anterior margin slightly projecting and with a short denticle; process of prothorax 98 slightly narrower than in N.angustulus, broadly rounded and bluntly pointed posteriorly. Antennae of male broadened from segment 5 which is large, slightly broader than long, hollowed ventrally; segment 6 longer and narrower than segment 5; segments 7—8 as broad as segment 6 but short and with a denticle at the anterior apical angle; segment 10 short, broadened into a lobe anteriorly; last segment pointed. Length 4—4.5 mm. Distribution. Middle and southern belt of the European USSR, Trans- caucasia, Middle Asia. Europe (rare in the north), Asia Minor, Iran, Syria. 4. Noterus ponticus Sharp. Sharp, 1880—1882:266. "Differing from the preceding species in the absence of large dots on the elytra, the weaker keel on the prothorax, and the broader antennae of the male. Length 4 шт." (after Sharp). Distribution. Iraq. 5. Noterus japonicus Sharp. Sharp, 1873, Trans. Ent. Soc. London:52; Régimbart, 1899:246; Zimmer- mann, 930:9. Reddish yellow; elytra darker; pronotum sometimes indistinctly dark in the middle; border at anterior margin of prothorax, and the abdomen blackish in the male; femora and tibiae of forelegs black. Prothorax slightly convex before the fore coxae, with a weak keel; middle of anterior margin of prothorax of male and female projecting in a short spine; process of prothorax of male distinctly punctate, smooth in the female, short and bluntly pointed posteriorly. Rows of dots of elytra small, more or less regular anteriorly, confluent posteriorly. Ventral side of hind femora without fascicle of hairs. Antennae of male only slightly broadened; segment 5 as long as broad; segment 6 attached to the outer half of segment 5, slightly narrower, but not shorter; segments 7—10 almost equally broad, becoming gradually shorter, rounded at the inner apical angle; their outer angle projecting into a short spine; last segment pointed. Length 4.2—4.3 mm. Distribution. Japan, China (Tsingtao, Fuchow). 6. Noterus granulatus Rég. Régimbart, 1883, Not. Leyd. Mus., V:225; 1899:246. "Reddish brown; elytra darker; pronotum with a diffuse dark area; oval, bluntly rounded at the apex; head and pronotum with a network of rounded cells; network of elytra consisting of longitudinal, undulate, parallel lines which are often contiguous. Surface with small dense tubercles or granules which are not very prominent; they are almost obliterated on the head; posterior third of elytra withafew scattered dots. Antennae markedly thickened in the middle. 99 Эй Length 4.75 mm (after Régimbart). This species was described from а single female; it is possibly an abnormal specimen of N.japonicus. ети стом, Бао 2. Tribe HYDROCANTHINI Sharp, 1880—1882:269; Zimmermann, 1930:9. This tribe contains 3 genera which are widely distributed in the Tropics and Subtropics; only one genus is represented in the Palearctic Region. 2. Genus Canthydrus Sharp. Sharp, 1880—1882:269; Zimmermann, 1930:9.—Hydrocanthus Régimbart, 1878, Ann. Soc. Entom. Fr. (5) VIII:455 (not Say). Type species: Hydrocanthus notula (Er.). Small, strongly convex, pointed posteriorly, strongly shining, often of bright coloration. Prothorax between the fore coxae flat, situated in the same plane as the hind coxae; process of prothorax slightly broadened, truncate posteriorly. Processes of hind coxae forming long, triangular, divergent posterior lobes with a fascicle of reddish cilia at the apex. Posterior margin of hind femora with a distinct row of dots on the ventral side and with a fascicle of red hairs at the end. This genus contains more than 80 species, but only a few species have spread into the Holarctic Region. Key to Species 1 (4). Pronotum black, with a more or less broad red border only at the sides. 2 (3). Head reddish only anteriorly, black posteriorly ...1. C.notula (Er.) . 3 (2). Head completely red. Each elytron with three red spots ....... ее 3. C.ornatus Sharp. 4 (1). Head, pronotum and whole venter uniformly red. . 4. C. politus Sharp. 1. Canthydrus notula (Ег.). Erichson, 1843, Arch. Naturg., 9:220; Zimmermann, 1930:10; ab. badeni Wehncke, 1876, Deutsch. Entom. Zeitschr., XX:223; ab. siculus Régim- bart, 1882, Nat. Sicil., 1:249; ab. numidicus Bedel, 1888, Ann. Soc. Ent. Fr. (6), VIII:286. Head red, its posterior half or third black; black stripe usually more distinct in the female. Pronotum red ventrally, black dorsally, with a broad, reddish yellow lateral border which is less sharply delimited inwards and 100 98 sometimes expanded so that the black background is reduced to a longitu- dinal median band (ab. siculus Rég.). Elytra with a rounded sublateral yellowish spot behind the middle; there is sometimes an additional small oblong spot lateral to the shoulders; border of pronotum either very narrow in this case (ab. badeni Wehncke) or broad (ab. numidicus Bed.). Antennae, palps and legs reddish; hind femora and tibiae brownish. Elytra with 3 irregular, weakly marked rows of dots which are confluent in the posterior third. Length 3—3.25 шт. Distribution. Southern Italy, Africa, Syria. 2. Canthydrus ornatus Sharp. Sharp, 1880—1882:275; Zimmermann, 1930:10. Black; head usually broad, passing inwards gradually into the black background; stripe on pronotum and 3 spots on elytra reddish yellow; first spot situated behind the shoulders large and oblong; second spot situated near the base, between the first spot and the suture, indistinct and small; third spot situated closer to the lateral margin, immediately behind the middle, small. Ventral side of head and prothorax, except middle plate, epipleura and legs reddish yellow; tarsi darker. Rows of dots on elytra delicate, irregular, loose, with few dots. Length 2.8—3.3 mm. Distributions Шгаю, Iraq, Syria: 3. Canthydrus politus Sharp. Sharp, 1873, Trans. Ent. Soc. London:51; Régimbart, 1899:251; Zimmer- mann, 1930:10. Oblong-oval; whole venter, legs, dorsal side of head, and pronotum reddish yellow. Elytra black; the following areas reddish yellow: a large spot at apex of the elytra; large oval spot between the first spot and the suture; a transverse band behind the middle, which is slightly broadened on the inner end, reaching the lateral margin, not reaching to the suture. This pattern is very variable; the yellow color sometimes predominates. Rows of dots on the elytra regular, delicate, weakly marked. Length 2.8mm (after Sharp). Distribution. Japan, China (Shanghai). 2. Subfamily LACCOPHILINAE Leconte and Horn, 1883, Class. Col. N. Amer.:63; Ganglbauer, 1892:481; Zimmermann, 1930:12; Csiki, 1946:582; Guignot, 1947:161. Body flattened; lateral margin of elytra and pronotum forming one curve. Scutellum not visible. Front and mid tarsi distinctly 5-segmented. Inner lobes of hind tarsi situated in the same plane as the outer lobes anteriorly; they are raised near the truncate posterior margin in their posterior part. Only one of the 3 genera of the subfamily is represented in the Palearctic Region. 101 99 3. Genus Laccophilus Leach Leach, 1817, Zool. Misc., П1:69; Ganglbauer, 1892:481; Zimmermann, 1930:12; Csiki, 1946:583; Guignot, 1947:162. Type species: Dytiscus minutus Linne, 1758. Body slightly convex dorsally and ventrally, ovoid or elliptical. Dorsum usually with a delicate network of rounded cells or of irregular polygonal loops; elytra with 3 very delicate, hardly distinguishable, irregular rows of dots and one row of dots in the Q posterior half, near the lateral margin; (99) OF dots with long hairs. Only a few “Ay ead ee species have additional dots. Venter < ам и mainly smooth; venter of abdomen with NX \ thin oblique dashes. Head short and — broad; clypeus truncate, without rim. х-- 1 < Antennae thin, filiform; palps simple. pO Sh =e Pronotum without lateral rim; middle = of pronotum more or less distinctly Si i s SE projecting posteriorly. Prothorax == very narrow. Process of prothorax Rone il № laterally compressed, with а more ог = less long posterior spine. Metathorax J forming a narrow curved lateral stripe because of the extreme development of the hind coxae; middle of process of metathorax with a longitudinal groove in which the process of the prothorax is placed. Hind coxae very large, strongly projecting anteriorly; coxal lines distinct, strongly converging anteriorly. Fore- and midlegs weak; claws thin, of almost equal length, curved. Hind legs strong; femora broad, truncate apically, with a right FIGURE АЯ ab Cop fu’, ани s Bes inner angle; tibiae shorter than femora, hae р with 2 long terminal spurs of different length which are slightly jagged apically. hind tarsi characteristic; first 4 seg- ments broad, decreasing in length; their outer angle projecting in a long lobe; ventral side with long natatorial hairs; each segment with 1 or 2 blunt spinules; last segment of female with a single straight claw; claw short in the male, flat, scale-shaped, situated between two spurs. Fore and mid tarsi of male slightly broadened; first 3 segments with a small brush of small narrow adhesive plates on the ventral side. Parameres asymmetrical; right paramere more rounded anteriorly, less pointed than the left; both parameres with a dense fascicle of long hairs on the apex or near it which apparently form one seta. Penis slightly spirally twisted. Larva (Figure 41). Body slightly cylindrical, more or less tapering posteriorly; head without frontal horn; neck more or less distinct; antennae >= 102 100 and palps large and delicate; last abdominal segment without natatorial setae. Head thick; temples with several large spines; labrum slightly triangular. Antennae 4-segmented, biramous; last inner segment of antennae the longest; mandibles long. Last abdominal segment cylindrical- conical, with a short but distinct terminal process. Cerci cylindrical, delicate; their last segment more or less long. Legs large and thin; tarsi much longer than tibiae; femora and tibiae with characteristic pectinate scales. Pupa. Head large, with 4 pairs of marginal and frontal setae. Pro- notum transverse, with straight anterior margin and numerous setae laterally. Abdomen broad, slightly flattened; segment 8 narrowed; soft cerci conical, tapering, with 3 proximal setae and 2 distal setae on the outer side. The genus contains more than 180 species, mainly in the Tropics. All stages live in stagnant or running water, mainly in clear water, in the plains and rarely in the highlands. Key to Species 1 (2). Hind coxae with an oblique row of short thin dashes near middle of body (stridulatory apparatus). Base of pronotum slightly pro- jecting posteriorly in the middle ........ *1. L.hyalinus (Deg.). 2 (1). Hind coxae without dashes. Middle of base of pronotum distinctly projecting posteriorly. 3 (8). Elytra with diffuse pattern of irregular spots which are some- times indistinct. 4 (5). Network on elytra double: one pattern more distinct, consisting of polygonal cells, visible on the background of the second delicate network which consists of smaller cells; second network less deeplysimpressedimnte ct set ee mh amen s *2. L. minutus (L.). 5 (4). Network simple, delicate, consisting of fine rounded cells in which the dots are dense but irregularly distributed. 6 (7). Broader, oval; mid femora completely covered with weak dots; whole venter ofibody reddish yellow’... o.”. ЖЗ. L.difficilis Sharp. 7 (6). Less broad, more oblong-oval; mid femora with distinct dots. Hind"coxae’and abdominal *sternites otten partly darks) 2) fic asie ls В - *4. L.apicicornis Rttr. 8 (3). Elytra with distinct pattern. 9 (16). Elytra with transverse or longitudinal bands, but without longitu- dinal undulate lines. 10 (13). Elytra brown, with 2 transverse yellow bands. Pronotum reddish yellow, anterior and posterior margin dark. 11 (12). Less convex, more oblong. Process of prothorax long and pointed Mik Nash cai shed Os Il al ООО *5. L. variegatus (Germ.). РО Nore short oval. Process of prothorax Эно 1). aaron a Stag AR Ae eh aa A aia a Ll i Tar lala IN ee *6. L.vagelineatus Zimm. 13 (10). Elytra reddish yellow, with numerous, slightly darker small longi- tudinal stripes with a brown border. 103 101 14 (15). Pronotum with a broad dark area at the anterior margin and with al narrow саткакеа! unemicddlle tot Базе late Cia ee ne ene ete ai) ba ER Se RN TA ERE Eh mrt *7. L. lewisius Sharp. 15 (14). IPecintcriioad Oi оао Colloie, Sanaleie o.4 4 4 ¢ 8. L.kobensis Sharp. 16 (9). Elytra reddish yellow, with longitudinal undulate lines. 17 (18). Network on elytra single, consisting of rounded cells; pronotum Gleel< ial оо Ohi ае аа Buy WHS SyanSiolOis MEIC oo 5 eg ob 6 oa of Fey Cee AUR i А sO) AUN Yo os rl a IE OS О АВЕ 9. L. sharpi Вх. * 18 (17). Network double, consisting of polygonal cells. Pronotum of uni- LOK MAKCOVORN, HS ET EIS EO a SAE твовИ: 10. L.solutus Sharp. Key to the Larvae 1 (2). Head short, slightly longer than broad. Body broad, yellowish ОЕ, \Wwiltlo leona, ВОО 5640500060 60000% *1. L.hyalinus (Deg.). 2 (1.) Head oblong, distinctly longer than broad. Body slender, uniformly yellownshpercecen .›. Мм с оо ОВ Sie *2. Т.. шие (L.). *1. Laccophilus hyalinus (Deg.). Degeer, Mém. Hist. Ins., 1V,1774:406 (Dytiscus); Ganglbauer, 1892:483; Zimmermann, 1930:14; Csiki, 1946:584; Guignot, 1947:164; B. Browne, 1934, Ent. Mont. Mag., LXX:127; ab. testaceus Aubé, 1836, Icon. Col., VI:214; Guignot, 1947:164; ab. kusteri Marseul, 1866, Catalogue: 19; Guignot, 1947:164. Broadly oval; coloration brown to greenish. Head usually of uniform color, with a very delicate network of polygonal loops on a smooth back- ground. Antennae and palps uniformly reddish yellow, rarely with slightly dark apex. Pronotum with slightly rounded sides strongly converging anteriorly; anterior angles rounded; posterior angles almost forming a right angle; middle of base slightly projecting posteriorly. Elytra much darker, transparent, with an indistinct pattern of yellowish ridges at the sides (behind the shoulders, in the middle, behind the middle and near the apex) and oblong parallel spots on the disc, 3 spots near the base and 3 behind the middle; the pattern appears marbled. It is sometimes much reduced and the elytra are of uniform color (ab. testaceus); the pattern is rarely distinct, dark brown on a lighter background (ab. kisteri). Eilytra with a delicate double network; one network more distinct, almost the same as on head and pronotum; second network thinner, consisting of irregular cells, and almost invisible in the anterior half, but more distinct in the posterior half. Prothorax slightly roof-shaped; its process is strongly laterally compressed, almost keeled, not reaching to the mid coxae. Hind coxae with a stridulatory apparatus near middle of body which consists of an oblique row of short, impressed, slightly bracket-shaped dashes. Last abdominal sternite slightly concave lateral to the convex middle. Length 4.5—5mm. Penis long, with a small denticle at the apex * Noterus ponticus Sharp. (р.99) is apparently closely related то this species or identical with it. 104 102 of the dorsal surface; this denticle is slightly directed to the right. Right paramere in form of an oblong scale, with broadly rounded apex and a small apical fascicle of hairs which stick together; left paramere smaller, its upper part triangular, also with a small fascicle of hairs. Distribution. Common almost throughout the whole Palearctic Region (except China and Japan). Ecology. Mainly in running, clear water. *2. Laccophilus minutus (L.). Linnaeus, Syst. Nat., ed. X, 1758:412 (Dytis cus); Zimmermann, 1930:15; Csiki, 1946:584; Guignot, 1947:164.— variolosus Herbst, Fussly Arch. Ins. Gesch., 1784:128; В. Browne, 1934, Ent. Mont. Mag., LXX:128.— obscurus Panzer, 1794, Ent. Germar., 1:7; Ganglbauer, 1892:483; ab. stroemi Thomson, 1874, Ор. Entom., VI:535;. Guignot, 1947:164; ао а ee li Guicnot, 1937, Bull. Fmt. (soc. Mira 2 : Venter, head and pronotum uniformly reddish yellow; elytra brownish green or brownish yellow, with diffuse indistinct stripes and spots; pattern rarely more distinct and in this case, there are 2 indistinct spots connected with the lateral border (in the middle and near the apex), an apical spot, a double spot behind the scutellum and several small linear spots along the suture and behind the middle. On the other hand, the pattern may be absent and the network is more distinct in this case (ab. stroemi). There are specimens in the Mediterranean in which the elytra are lighter, only slightly darker than the pronotum, i.e., the dorsum is uniformly reddish yellow, except a narrow dark sutural stripe and a thin brownish line along the suture.. There is a lighter color variation in Iran in which the elytra are darker apically, with light small spots near the base; the suture is brown and several small brown spots are present at the base and on the sides (ab. mougeli). Apex of antennae and maxillary palps dark. Middle of base of pronotum distinctly angular posteriorly. Network on elytra double: one network larger, irregular, consisting of polygonal cells; second network very delicate, slightly impressed. Hind coxae without stridulatory apparatus. The network was almost simple in one case, similar to the network of L.apicicornis Rttr. (from Lapland, according to Gschwendtner, 1939). Length 4—4.5 mm. The species differs from L.hyalinus in the weaker network on the head, the narrower body, the less regular rounded sides, the usually more greenish coloration, the shorter segments of the antennae, the darker apex of the antennae and palps, the middle of the pronotum which projects more distinctly posteriorly, the diffuse, often indistinct pattern of the elytra, the absence of a stridulatory apparatus, etc. Penis broad at the base, narrow dorsally; its apex without a denticle. Right paramere more oblong; the small fascicle of setae is not situated at the apex but near it, on the ventral side; left paramere more triangular in the posterior half. Distribution. Whole Palearctic Region. Common. Ecology. Mainly in calm water. 105 103 3. Laccophilus difficilis Sharp. Sharp, 1873, Trans. Nat. Soc. London:53; Régimbart, 1899:254; Zimmermann, 1930:17. Coloration as in L.minutus; pale pattern of elytra also diffuse and indistinct; however, this species differs from L.minutus in the broader oval body which is less narrow posteriorly, and especially in the simple network of the elytra; this network consists of closely adherent rounded cells which contain dense but irregularly distributed small dots. Length 4.2—4.5 mm. Distribution. Japan, China (Shanghai, Yunnan). *4. Laccophilus apicicornis Rttr. Reitter, 1899, Deutsch. Entom. Zeitschr.:198; Zimmermann, 1930:17; Gschwendiner,, 193931) abt pa аа Zimmermann! 1950:17: = une form is) Pens, 1956, Peking Nat. Hist. Bull. Ш:1; Gschwendiner 19319515 ab. nigritulus Gschwendtner, 1935, Rec. Ind. Mus., XXXVII:367. Closely related to the two preceding species. Differing from L.minutus in the simple network on the elytra which consists of small rounded cells; it differs from L.difficilis in the less convex body which is less rounded laterally; it differs also from both species in coloration and in the distinct punctation on the hind femora. Dorsum usually pale reddish yellow, some- times darker; the narrow border and the line along the suture brown. There are sometimes 3 or 4 diffuse, darker longitudinal stripes on the elytra. Hind coxae slightly dark. Abdomen, except the 1st and last two sternites also usually blackish, especially laterally; whole venter rarely uniformly reddish yellow (ab. pallidulus); whole venter sometimes black except legs and posterior margin of last 4 abdominal sternites (ab. nigri- tulus). Antennae and palps dark in their apical half. Network on dorsum as in L.difficilis, but consisting of broader loops on head and pronotum. Length 4.2—4.5 mm. Distribution. USSR: steppe zone from the Volga through southern Siberia to Transbaikalia and southern Yakutia. Mongolia, north China, Е > *5. Laccophilus variegatus (Germ.). Germar, 1812, Fn. Ins. Eur.3 (Dytiscus); Ganglbauer, 1892:483; Zimmermann, 1930:14; Csiki, 1946:585; Guignot, 1947:163; ab. muelleri Zimmermann, 1920, Col. Cat., 71:28; ab. parumpunctatus Schneider, 1902, Isis:51; ab. flavidus Guignot, 1947:163. Oblong-oval, reddish yellow; elytra densely covered with dark brown mottling or small spots that leave a lateral border free which is broad and serrated on the inner side, two transverse bands and numerous small yellow spots near the apex, often also a narrow area near the scutellum, and 106 а line along the suture which is often interrupted; lst transverse band situated near the base, directed obliquely to the middle; this band is usually divided into 2 spots and does not reach the suture or the lateral border; 2nd band straight, irregular, serrated, situated farther from the suture than the first band and situated behind the middle; there is some- times only an anterior band, and the posterior band is either absent or divided into a group of small spots (ab. muelleri); both bands are some- times absent or absent in their greater part (ab. parumpunctatus); the dark mottling is rarely much reduced so that the specimens are very light (ab. flavidus). Pronotum dark at the base and in the middle of the anterior margin. Network double: on head andpronotum it consists of large polygonal cells and is hardly visible; on the elytra it is well marked and consists of dense, small, rounded cells which contain a few delicate irregular loops. Process of prothorax narrow, with a very long spine. Epipleura of elytra with a small groove in the anterior half. Length 3.4—4 mm. First three segments of fore and mid tarsi of the male slightly broadened; empodium of hind tarsi broad and with spinules. Penis narrow; its dorsal surface with a broad irregular broadening at the base; its apex thickened and truncate. Parameres short; right paramere with a strong process on the dorsal side; left paramere in form of a triangular pyramid; both parameres end in a blunt spine which bears a small apical fascicle of setae which stick together. Empodium of hind tarsi of female without spinules, long and thin. Distribution. USSR: south of the European part, Transcaucasia, Middle Asia; rarer than L.minutus and L.hyalinus. Rare in northern and Central Europe, but common in the south and in the whole Mediterranean. Ecology. It is found in small marshes and also in brackish water. 104 *6. Laccophilus vagelineatus Zimm. Zimmermann, 1930:18. Oval, slightly (almost uniformly) narrowing anteriorly and posteriorly, reddish; a narrow stripe at the anterior margin and in middle of base blackish. Elytra brownish; the following areas yellowish red: lateral border which is broadened inwards (behind the shoulders and in the middle); numerous straight, indistinct, narrow, longitudinal stripes on the dorsum; these stripes are most distinct near the base, where they are broader and form a transverse irregular band together with the shoulder spot; a similar but more irregular band is formed by these bands in the posterior third, ofthe elytra. Network asin. L.apicicornis. Process of prothorax short; middle of pronotum projecting posteriorly in a short triangle. Specimens from China are more strongly convex; the body is slightly shorter; the elytra are usually darker; longitudinal lines hardly recog- nizable, but both bands are distinct, especially the anterior band. The dark stripe at the anterior margin and at the base of pronotum and the coloration of the elytra resemble those of L.variegatus; however, 107 105 this species differs from L.variegatus in the short-oval body, the short process of the prothorax, and the pattern of the elytra. Length 3.5—3.7 mm. Distribution. USSR: Maritime Territory (Spassk). China (Manchuria, Fuchow). *7, Laccophilus lewisius Sharp. Sharp, 1873, Trans. Ent. Soc. London:52; Régimbart, 1899:254; Zimmermann, 1930:19. Reddish yellow; black border at base of pronotum narrow; slightly broader at the anterior margin. Pattern of elytra slightly darker than ground color, but sharply delimited by the blackish spots and the four stripes which are sometimes indistinct and usually connected near the apex and behind the middle and are isolated only in the anterior half; the 3 outer stripes are skittle-shaped anteriorly and do not reach the base; inner stripe (along the suture) broadly interrupted anteriorly. A longitudinal spot is fused with the 4th stripe in the middle; two serrated longitudinal small spots with black border are contiguous with the anterior and posterior end of the above spot; a similar small spot, usually connected with the anterior margin of the outer stripe, on the shoulder. Middle of base of pronotum less projecting posteriorly than in L.minutus, but more strongly than in L.hyalinus. Network distinct, consisting of numerous broad cells; the elytra appear therefore delicately shagreened (more finely on head and pronotum). Apex of antennae and palps slightly dark. Front and mid tarsi of male strongly broadened. According to Zimmermann, Chinese specimens are very small, but do not differ from the Japanese specimens in other characters: Mengith 3.5 —2 enna Distribution. USSR: Maritime Territory. Japan, China. One of the 4 specimens at our disposal, (from Voroshilov [now Ussuriisk]) is small (3.9 mm), with a distinct pattern; two other specimens (from Evgenevka and Tumen-ula) are larger (4.8 mm), with a less marked pattern on the elytra. 8. Laccophilus kobensis Sharp. Sharp, 1879, Trans. Ent. Soc. London:53; Régimbart, 1899:254; Zimmer- mann, 930:9. Closely resembling L.lewisius, especially the Chinese form; pattern similar, but its border is brown; the pattern is therefore less distinct. The species differs from L.lewisius also in other characters; body narrower, more oblong-oval; pronotum of uniform color; middle of base slightly more strongly projecting posteriorly; sheen of elytra weaker and the network quite different: it consists of small polygonal cells on head and pronotum and of rounded, uniformly large cells with a delicate, fine punctation on the elytra. Length 3.5—3.7 mm. Distribution. Japan, China (Tsingtao, Fukien). 108 9. Laccophilus sharpi Reg. Régimbart, 1899, Ann. Soc. Ent. Fr., 1X:151; idem,1899:256; Zimmer- mann, 1930:20. This species is very variable. Dorsum and usually also venter reddish yellow; hind coxae and abdomen sometimes more or less dark. Pronotum in the middle of the anterior and posterior margin with a black border which is either broad and sharp or narrow and indistinct, sometimes absent. Elytra clay yellow, with thin blackish zigzag or undulate lines which are repeatedly anastomosed, usually in pairs near base and apex; they are usually (but not always) interrupted so that the background remains free in form of more or less marked transverse spots or bands. The lines are sometimes broadened so that the elytra appear almost black, and the yellow coloration of the lateral margin and the numerous small undulate mottles are strongly reduced. On the other hand, the longitudinal lines may be strongly reduced, so that the yellow color predominates, and the lines are present only in the posterior half in form of short undulate rudiments. Network simple, consisting of rounded cells. Last abdominal sternite of male weakly projecting posteriorly in the middle, more strongly in the female, with a slight indentation on the sides. Length 3.5—4 mm. Distribution. Whole tropical Asia, China, Japan, Australia. Zimmermann thinks that Noterus ponticus Sharp from Iraq (р. 96) also belongs to this species. 10. Laccophilus solutus Sharp. Sharp, 1880—1882:315; Regimbart, 1899:255. — chloroticus Régimbart, 1887, Not. Leyd. Mus.:267. Oval, broad, especially anteriorly; slightly narrowing posteriorly, pale, yellowish red; elytra (except lateral margin) with irregular, brown, indistinct small spots which represent the rudiments of the confluent, undulate and repeatedly interrupted longitudinal lines. Network double, slightly impressed, consisting of polygonal cells. Length 4mm. Distr Wout 1on. China. me 3. Subfamily HYDROPORINAE Erichson, 1837, Kafer Mk. Brandbg.:166; Ganglbauer, 1892:445; Zimmermann, 1930:25; Csiki, 1946:585; Guignot, 1947:55. Scutellum completely or almost invisible. Process of prothorax not situated in the same plane as the prothorax. Fourth segment of fore and mid tarsi very small, almost indistinguishable, so that the tarsi appear 4-segmented. This subfamily contains 6 tribes, only 4 of which are represented in the Palearctic Region. 109 107 Key to Tribes 1 (8). Elytra uniformly rounded posteriorly; end of abdomen also rounded. 2 (3). Claws of hind tarsi markedly different; outer claw strongly reduced Нес. оВТе Je ET aspen Эва eave tenia со SISK wot “S.eDribes Hyphydrini: 3 (2). Claws equal. 4 (5). Process of prothorax broad and rounded apically. Sutural angle of ely trayusua livin Oi1nteGan) werner cael cms mein aie te 4. Tribe Hydrovatini. 5 (4). Process of prothorax not broadened apically. Sutural angle of elytra usually not pointed. 6 (7). A dash present on each side of base of elytra in most species, which is a continuation of the dash on the pronotum ...5. Tribe Bidessini. 7 (6). Dash at base of elytra and on pronotum absent .............. SIO: boul Ва оо 164. o: о: ооо diel wal или bit Ge SR ribe rhiyaropexrina, 8 (1). End of elytra and abdomen projecting posteriorly ina spine ..... ор Вл Омер = aha Бо et ee be Metin: Зее IshOISlee Day Uni. Sharp, 1880—82:370; Zimmermann, 1930:26; Csiki, 1946:588; Guignot, 1947:55. Process of hind coxae flattened, short, and base of trochanters therefore open. The tribe contains 10 genera, only one of which is represented in the Palearctic Region. 4. Genus Hyphydrus 11. Illiger, 1807, Mag. Ins., 6:349; Ganglbauer, 1892:447; Zimmermann, 1930:32; Csiki, 1946:588; Guignot, 1947:588. Type species: Dytiscus ovatus L. Short, broadly oval, strongly convex dorsally and ventrally, almost spherical. Clypeus with a rim at the anterior margin. Last segment of maxillary palps as long as second segment but thicker, bluntly pointed and slightly jagged apically. Antennae thin, filiform. Three longitudinal rows of dots on the elytra hardly recognizable. Pronotum between the large front coxae narrow, with a blunt denticle in the middle; process of prothorax short, slightly broadened and rounded posteriorly. Epipleura with a shallow indentation at the base and with a sharply marked rim; the mid femora are situated in this indentation. Metathorax long in the midline; lateral lobes of metathorax narrow, ribbon-shaped, strongly curved. Hind coxae strongly developed. Process of metathorax compressed, short, with an obtuse- angled indentation posteriorly. Coxal lines distinctly impressed, parallel posteriorly, divergent anteriorly. Last tarsal segment with a large, strong, slightly curved claw and a second very small claw. Fore and hind tarsi 110 of female slightly compressed laterally; those of the male broadened; first three tarsal segments of male and female covered ventrally with a felt of two types of adhesive tubules and hairs. AN \ ты a FIGURE 42. Hyphydrus ferrugineus [. Larva. The larvae of two species have been described, one from Sumatra and the other of the common Russian species H.ovatus L. (Figure 42). Body humpbacked; head with a long frontal horn which is narrower in the middle, broadened at the apex, and slightly indented at the sides; labium long and narrow. Abdomen sclerotized also on the ventral side, from segments 4 or 6. Cerci short, as long in mature larvae as the last segment which has a long process with 7 primary setae: 3 of them isolated, 3 situated near the end ofthe 1st segment of the cerci, and one seta situated at the base of the 2nd segment. Natatorial setae appear on the tarsi in the second stage. Pupa. Cerci cylindrical, conical, short, with long terminal spine. This genus contains about 70 species distributed throughout the world except in America; they are distributed mainly in the Tropics. 111 108 Key to Species 1 (10). Larger (more than) 35 mm): 2 (3). Elytra without distinct pattern; there is rarely a diffuse yellowish band behind the middle which is sometimes divided into two spots Ree Е с о с hese el *1. Н. ovatus (L.). 3 (2). Elytra usually with distinct pattern. 4 (5). Punctation of elytra irregular, consisting of large and very small dots. Punctation of hind coxae coarse, sparse. Dorsum of both Sexes Shining yi een emanate о 2. а. Лаехлуенея с эвавр: 5 (4). Difference between large and и dots of elytra not marked. Hind coxae with large, dense dots. Male shining; female mat. 6 (9). Body oval, distinctly narrower anteriorly. 7 (8). Clypeus slightly rounded anteriorly. Abdomen with dense, strong dots. Process of prothorax lanceolate, with a weak median keel I REAM Ио об ао" ь: ола о ered 3. Н. orientalis Cl. 8 (7). Anterior margin of clypeus of both sexes broadly rounded ..... а Ai). SuOken SG oliuiotc Sd ic) AS ne 5. H. falkenstromi Gschw. 9 (6). Body broadly rounded. Depression on head strongly marked. Abdomen with small, scattered dots. Process of prothorax oval or elliptical, with a sharp keel in the midline. .. 4. H. japonicus Sharp. 10 (1). Smaller,2.5mm. Elytra with 3 yellow spots, one at base and two behind the middle (one of these two spots sometimes absent)... . chores alfa: vai. sige, eel Sire anise Meg ыонс 9а ООО 6. H.flavomaculatus Kam. *1. Hyphydrus ovatus (L.). Linné, 1761, Fn. Suec., ed. 12:549 (Dytiscus); Zimmermann, 1930:33; Csiki, 1946:589; Guignot, 1947:56.— ferrugineus (L.), Ganglbauer, 1892:448; ab. variegatus Stephens, 1828, 111. Brit. Ent., II, 1828:45; Guignot, 1947:57. Short, oval, rust red; elytra brown, lighter laterally and at base, rarely with an indistinct, yellowish, transverse band consisting of two spots behind the middle (ab. variegatus Steph.). Clypeus with a thin rim which is indistinct in the middle. Venter slightly shining, distinctly shagreened, with large dense dots on the metathorax and hind coxae; abdomen with sparse, very small dots. Male usually larger; dorsum shining except for a mat area on anterior part of head; posterior lateral part of head with fine, dense dots; pronotum and elytra with coarse, dense dots, interspersed with finer dots. Base of penis large; penis curved and uniformly thick to the apex. Para- meres elongate; the very narrow apical part bears cilia for a short distance on the ventral side. Length4—5mm. Female smaller; whole dorsum with an indistinct network of elongated loops, mat, with a silky sheen. Dots on pronotum much smaller than in the male; they are almost absent on the elytra and slightly stronger only near the apex. Distribution. Europe, Siberia, Transcaucasia. Ecology. Stagnant water among detritus and rotten plants. Rare. 112 2. Hyphydrus laeviventris Sharp. Sharp, 1873, Trans. Ent. Soc. London:381; Régimbart, 1899:215; Zimmer- mann, 1930:36. It is characterized by the very irregular punctation on the dorsum: the few large dots are very large; the small dots are very small. Broadly and regularly oval; venter of male reddish brown, that of female lighter. Head red, with 2 large dark spots at the posterior margin, with a deep depression behind the clypeus, with fine, dense punctation; punctation of frons finer and sparser. Pronotum red; the following areas on the pronotum black: a broad stripe at the anterior margin, a larger stripe which consists of 2 spots and does not reach the straight lateral margin; base with irregular, coarse, dense dots which are more scattered on the disc. Elytra witha 109 distinct row of large dots on the disc, with irregular punctation and with a black pattern which is the same as in the following two species but which is more strongly developed, i. e., the reddish yellow background is strongly reduced. Process of prothorax broadly oval, with a sharp keel in the middle. Male. Head and the whole dorsum smooth and shining. First segment of fore and mid tarsi strongly broadened, large. First abdominal sternite with a slightly projecting, short longitudinal tubercle near the posterior margin which is sometimes reduced. Anal sternite with a narrow, shallow, trans- verse depression near the apex. Lengthimm. Female slightly smaller; head, especially in its weakly punctate anterior half, distinctly shagreened; other part of dorsum shining. Length 4.5mm. Пизе ution. Japan. 3. Hyphydrus orientalis Cl. Clark, 1863, Trans. Entom. Soc. London:419; Régimbart, 1899:214; Zimmermann; 1930:37.— detectus Falkenstrém, 193'6;Lingn:’ Sc. Journ’, 50:81 (after Gschwendtner, 1939-3). Body short, broadly ovoid, slightly narrower posteriorly. Head yellow, with 2 dark spots on the frons and near the eyes; these spots are some- times indistinct. Pronotum broadly dark in the middle of the base; sometimes also weakly dark at the anterior margin. Elytra yellow with blackish brown pattern, the narrow border on the suture extends along the whole suture; it is enlarged in the middle into a square spot fused with the transverse band with two pointed processes which does not reach the lateral margin; a short thin dash in the middle of the apical part of the sutural stripe, perpendicular to it; this dash is turned upward at the end at a right angle and is fused with the lateral margin and with the median square spot; one row of 4 small spots at the lateral margin. The pattern varies markedly toward greater development and toward reduction. Frons with a weak depression. Process of prothorax lanceolate, bluntly pointed, with a weak median keel. Abdomen with dense, strong dots. Trochanters of fore- and midlegs with dense, long setiform hairs at the ventral margin. Dorsum of male shining, that of female mat. Length 3.5—4 mm. Distribution. China. 113 110 4. Hyphydrus japonicus Sharp. Sharp, 1873, Trans. Ent. Soc. London:54; idem, 1884:441; Régimbart, 1899:215.— orientalis Falkenstrém, 1936, Lingn. Sc. Journ., 15(1):81 (not Clark, after Gschwendtner, 1939:3). Closely related to H.orientalis and often confused with it (according to Falkenstrém, collections often contain hybrids of both species). The species differs from H.orientalis Cl. in the broadly oval body, its slightly greater size, the larger tubercle on the prothorax between the fore coxae, the oval or elliptical (not lanceolate) process of the prothorax, the more delicate and sparse punctation of the abdomen, the weak development of the hairs on the ventral margin of the fore and mid trochanters, and the different male genitalis (penis uniformly broad, narrower at the apex; it is inversely ovoid in H.orientalis; it is narrow near the apex and forms a small cap with a denticle on both sides at the end, etc.); female mat. Length 4—4.5mm. Distribution. Japan, North China: 5. Hyphydrus falkenstromi Gschw. Gschwendtner, 1939:3. Short-oval; head reddish yellow; pronotum and elytra black, with fine dots. Elytra with 3 yellow spots: a broad transverse spot at the base, the other two spots situated behind the middle; one of them small and often indistinct. Venter and legs yellowish brown. Length 2.5mm. Distribution. Japan. 6. Hyphydrus flavomaculatus Kam. Kamiya, 1938, Journ. Tokyo Nog. Daig., V:10; Gschwendtner, 1939:4. Short-oval; head reddish yellow; pronotum and elytra black, with fine dots. Elytra with 3 yellow spots: a broad transverse spot at the base, and the other 2 spots situated behind the middle; one of them small and often indistinct. Venter and legs yellowish brown. Length 2.5mm.* Distribution. Japan. Tribe HYDROVATINI Sharp, 1880—1882:320; Zimmermann, 1930:25; Csiki, 1946:586; Guignot, 1947:57. Process of prothorax broadened at the end in the form of a triangle or spatulate. Processes of hind coxae divided by two deep indentations into three lobes; median lobe situated in the plane of the abdomen; both lateral lobes narrow, diverging, covering base of trochanters. Hind claws equal. me [This is apparently a mistake as the description is identical with that of H. falkenstromi.] 114 This tribe contains 3 genera; only one of them is represented by a few species in the Palearctic Region. 5. Genus Hydrovatus Motsch. Motschoulsky, 1855, Etud. entom., III:82; Ganglbauer, 1892:446; Guignot, 1947:58. Type species: Hyphydrus cuspidatus (Kunze), Small, broadly oval, short, rounded, strongly convex. Head broad; clypeus with a small rim. Elytra with a short spine posteriorly. Process of prothorax short, broad, projecting posteriorly in form of a triangle with rounded angles; its base contiguous with the metathorax, and its apex swollen between the front coxae. Mid coxae widely separated by the wide process of the metathorax. Lateral wings of metathorax broad, curved laterally and produced into a narrow ligula. Hind legs slender; tarsi longer than tibiae; both claws equal, weakly curved. The larva has been described only for H.clypealis Sharp (Figure 43); abdomen flattened, sclerotized in its greater part. This genus contains about 100 species, mainly in Africa; only a few species occur in the western Mediterranean, in Central Europe and eastern Asia. *1. Hydrovatus cuspidatus (Kunze). Kunze, 1818, М. Schr. Nat. Ges. Halle, IT; 5:68 (Hyphydrus); Ganglbauer, 1892:446; Zimmer- mann, 1930:27; Csiki, 1946:587; Guignot, 1947:58. Venter reddish brown; antennae, legs, head and pronotum lighter; base of pronotum dark brown. Elytra brown, lateral margin of elytra and the 2 transverse bands connected with it and not quite reaching the suture (the first near the base and the 2nd behind the middle) red. These bands are sometimes slightly diffuse, but distinct; anterior band often divided into two spots. Head shagreened, shining, with delicate, hardly visible, small dots; clypeus slightly rounded, with a narrow, distinct rim. Pronotum with a narrow lateral rim. Elytra with a pointed sutural angle, strongly but not densely punctate, less punctate laterally and toward the apex. Metathorax, hind coxae and base of abdomen with coarse, dense dots. Length FIGURE 43. Hydrovatus may clypealis Sharp. Larva. 2.5-3mm. Male. Elytra shining; network not 115 stronger than оп the pronotum. Anterior margin of hind coxae witha narrow stridulatory apparatus laterally; this apparatus consists of a narrow transverse row of dense, very short, parallel dashes. Female. Elytra slightly shining or mat; network much coarser (especially in the posterior third) than on the pronotum, consisting of dense, rounded, uniform cells. Distribution. USSR: southern Ukraine, Transcaucasia, Middle Asia. Rare in Central Europe; more common further south and in the whole Mediterranean. Ecology. Fresh and brackish water. Another 3 species of this genus have been described from Japan, but the _ descriptions are unsatisfactory. We give them below after Gschwendtner. 112 2. Hydrovatus adachii Kam. Kamiya, 1932, Mushi, 5:4; Gschwendtner, 1939:2. Closely related to the uniformly reddish H.acuminatus Motsch., but broader, more convex and larger. Punctation of elytra larger and denser. Length 2.7mm. Distribution. Japan. 3. Hydrovatus japonicus Tak. Takizava, 1932—1933, Ins. Matsum., VII:166; Gschwendtner, 1939:2. Also closely related to H.acuminatus Motsch., but larger and broader; elytra larger and with denser punctuation. Clypeus with distinct rim. Length 2.6mm. Distribution. Japan. Probably identical with H.adachii; both descriptions were written almost at the same time. 4. Hydrovatus loochovensis Kam. Kamiya, 1938, Journ. Tokyo Nog. Daig., V:10; Gschwendtner, 1939:2. Frons and vertex with delicate dots; dots absent on the occiput. Pro- notum with very fine dots. Elytra with three rows of dots, the intervals between them with dense, fine punctation. Hind coxae with dense dots. Head and pronotum yellowish brown; elytra dark brown; venter and legs yellowish brown. Length 3—3.5 шт. Distribution. Ryukyu Islands. 5. Tribe BIDESSINI Sharp, 1880—1882:344; Ganglbauer, 1892,453; Zimmermann, 1930:41; Csiki, 1946:591; Guignot, 1947:259. 116 The smallest species of the family (minimum size 1.3mm). Hind tibiae long, slightly curved at the base, broadened in the distal half. Hind claws equal. Parameres of male consisting of several parts. The tribe contains 5 genera, but only 3 occur in the Palearctic Region. Key to Genera 1 (4). Clypeus slightly rounded anteriorly or truncate, without а rim. 2) Blytralsmooth. Coxal lines diverpinguantertorly ие. И НЯ BAAD REC ESOS ASS Meee es era ee aie 6. Bidessus Sharp. 3 (2). Each elytron with a sharp longitudinal ridge on the disc which reaches to the posterior third; a depression between ridge and Sutures @оха нае“ рака Те» Wort eck amet ese ee 7. Yola Desg. 4 (1). Anterior margin of clypeus semicircular, usually with a distinct ео CbrIAC 8. Clypeodytes Reg. 6. Genus Bidessus Sharp. Sharp, 1880—1882:344; Ganglbauer, 1892:453; Zimmermann, 1930:41; Csiki, 1946:591; Guignot, 1947:61. Type species: Dytiscus unistriatus Schr. Clypeus without rim at the anterior margin or thickened and separated from anterior part of frons by a transverse depresssion (thickening some- times divided into 4 tubercles), or clypeus flat, smooth. Elytra narrowly ovoid, with a longitudinal impressed dash in the middle of the base of each elytron; this dash corresponds to the dash on the pronotum and extends posteriorly more or less straight to a third or half of the elytra; it is rarely very short and replaced by a dot or absent in one species. There is often also an impressed presutural dash (groove) along the whole elytra or only in the anterior half; this line is sometimes represented by a row of dots; it is absent in some species. Three rows of longitudinal rows on the elytra absent. Parameres of male consisting of two parts; apical part articulated with the basal part. The larvae have been described for two species, one American and the common B.pusillus Е. Body slightly cylindrical, moderately flattened, broad anteriorly, tapering posteriorly. Frontal horn medium-sized, strongly tapering. Eighth abdominal segment with long terminal process; cerci consisting of 2 segments of almost the same length, with 7 primary 113 setae: first segment with an isolated proximal seta and a group of 2 setae; 3 setae situated closer to the end; second segment with a seta at the end. Coloration dark gray. A large group of species (about 70 species, mainly in Africa) were separated from Bidessus as the genus Guignotus Houlbert (1934) because Guignotus has no transverse dash on the vertex which connects the posterior margin of both eyes; this is difficult to recognize. The view of Houlbert was accepted by Guignot (1947); however, this character seems hardly sufficient to establish a new genus; it would be more correct to consider this group of species as a subgenus. 117 114 Bidessus occurs throughout the world; it is divided into a number of subgenera (?genera) and contains over 150 species of which only 20 occur in the Palearctic Region. Key to Species 1 (24). (idk) )g 12 (10). 13 (16). 14 (15). Elytra with an impressed presutural dash which is complete or short. Presutural dash reaching the apex; metathorax with fine dots in the middle. Greater part of head dark, reddish only anteriorly; apical half of antennae also dark. Oval, narrower posteriorly; pattern on elytra usually consisting of a large angular spot which usually has 1 or 2 more or less Торреса сея ее *1. В. pusillus (Fabr.). Broad, much less narrow anteriorly. Pattern on elytra consisting of a sutural line, a long line connected with it behind the middle (widened in form of an angle at the apex) and of a second line which is also widened at the end; these lines are sometimes more or less fused in the posterior half ....... *2. В. japonicus Sharp.* Head and antennae uniformly reddish yellow, with a narrow brown stripe on the vertex. Pattern of elytra consisting of isolated or more or less fused longitudinal lines or stripes. Blackish stripe at base of elytra long, reaching the shoulders; impressed lateral dash shorter than dash on pronotum. Dorsum with fine, scattered dots; hind coxae withindistinct dots AEE SACD: ie ORE A CIE ER EOC CND „бои *6. В. signatellus (Klug.). Dorsum and hind coxae with coarse, dense dots ......... 5) bei И ОИ 1..... ЖТ. B.hamulatus (Gyl1.). Dark stripe at base of elytra short, reaching only the basal dash VES Ви BYE ALLS: *8. B.confusus (Klug.). Presutural line distinct only in the anterior half, disappearing behind the middle. Metathorax with a longitudinal row of coarse dots on each side of the middle. Lateral, impressed dashes at base of elytra long, reaching almost middle of elytra; elytra uniformly covered with fine, dense dots. Head without transverse depression near the anterior margin. Oblong-oval, sides almost parallel; slightly convex. Dark stripe at base of elytra longer, reaching lateral margin; apical half of antennae and posterior part of head always dark; body less tapering; sides of pronotum less rounded ......... о A RRR) ...... 9. B.minutissimus (Germ.). Dark stripe shorter, reaching only to basal dash; antennae only slightly dark at the end; body more pointed posteriorly; pronotum more) roundedtlaterallyi ов 10. B.delicatulus Schaum. Oval; side's slightly rounded;s dorsum convex.) ). ПЗ. ОВ * Another three species closely related to В. japonicus have been described from Japan and China: 3) В. hummeli Falk.; 4) В. licenti Feng.; 5) В. yoshimurai Kam. Their descriptions are so unsatisfactory that they cannot be included in the key. We give the original descriptions below. 118 17 (12). Lateral dashes shorter, not reaching beyond a quarter or third of elytra. 18 (19). Clypeus flat, without tubercles ....... *12. B.unistriatus (Schr.). 19 (18). Clypeus with 2 tubercles in the middle; a thickening in form of a ridge on each side above the antennae. 20nd) SHE lytra uniformlycdark) usually without spotsii) и. ыы ss lal PPA Gal eT ee a eae RAS Пет *13. В. grossepunctatus Vorbr. 21 (20). Elytra with a pattern consisting of spots or bands. 22 (23). Elytra with coarser and more scattered dots between the pre- sutural and lateral dashes than laterally and in the subapical region; female without microscopic sculpture. Anterior transverse band ‘reaching to:the suture’). . 0)... ее *14. B.nasutus Sharp. 23 (22). Elytra uniformly, coarsely, densely punctate; female with distinct MMCrOSCOple SCulptuneming Gusta. Вела 15. B.exornatus (Reiche). 24 (1). Elytra without impressed presutural dash. 25 (28). Head and pronotum normal. 26 (27). Smaller (1.8—2 mm), narrower, with distinct reddish yellow pattern О а ОЕ о cpeiial ess le sere ee neue aie *16. B.alienus Zimm. 27 (26). Larger (2.7—3.2 mm), broader; pattern more or less diffuse .... ее о ее ray er 17. B.maculosus Gschw. 28 (25). Head large; pronotum long. Elytra uniformly brown ........ oe 8 LO eM gO MG Gita SMG GAS T SA GNET GMOS Rh ORaNO eS 18. B.megacephalus Gschw. *1. Bidessus pusillus (Fabr.) (Figure 44) Fabricius, 1782, Spec. ins. [:297 (Dyti scus); Guignot, 1947:66; ab. geminus Fabricius, 1792, Ent. syst., 1:199; Ganglbauer, 1892:456; Zimmermann, 1930:46; Csiki, 1946:592; Guignot, 1947:66.— duftschmidti D. Torre, 1877, Jahresber. Ver. nat. Oesterr. VIII:59. Oblong-oval; covered with fine, delicate hairs; yellowish; greater part of head blackish, dark red anteriorly; apical half of antennae dark. Pronotum reddish, dark at the anterior and posterior margin; lateral dashes large, oblique, curved at the base, with a small pit near the inner side; disc covered with small scattered dots. Elytra light reddish yellow, sometimes straw-yellow; following parts of elytra black: anterior margin, suture, and a large spot on the disc, slightly behind the middle; this spot has an irregular margin and usually two more or less long processes (f. typica); pattern usually very variable; the discal spot may be very large and leave only 3 small longitudinal yellow stripes near the base (ab. geminus), or the yellow background FIGURE 44. Bidessus pusillus consists only of several yellow spots at the base (Fabr.) and apex; the black discal spot is reduced toa 119 ENG small irregular spot in other specimens; however, the head is dark posteriorly in this case. Presutural impressed dash complete along the whole suture, slightly inclined inward anteriorly. Lateral basal dashes short, almost as long as lateral dashes on pronotum. Punctation of elytra slightly finer and denser than on pronotum. Venter black, with light hairs; anterior part of prothorax and process of hind coxae more or less dark. Penis short, broad, with parallel sides; its apex slightly truncate. Para- meres consisting of 2 parts of different form; apical part pyramidal, slightly curved, with a constriction in the middle, truncate apically in form of a small flat area with 2 spines; outer spine projecting more strongly. Вей 2-2. ааа. Distribution. Whole USSR. Whole Palearctic Region (to Yunnan); rare inthe north. This is the most common species of the genus in the USSR, which sometimes occurs in large numbers. *2. Bidessus japonicus Sharp. Sharp, 1873, Trans. Entom. Soc. London:54; Régimbart, 1899:223; Zimmermann, 1930:43; var. trassearti Feng, 1936, Peking nat. hist. Bull. 11, 1:4; Gschwendtner, 1936:6. Oval, broad, slightly narrower posteriorly, shining; venter red, slightly brownish; dorsum reddish yellow; head brown posteriorly and near the eyes; pronotum with narrow black stripe at the anterior margin and a broad black band between the basal dashes; on the elytra, a band at the base, a band near the shoulders, which is broadened posteriorly, suture and 2 longitudinal stripes blackish; the first of these stripes connected with the sutural stripe for a greater or smaller distance; the second stripe shorter; both stripes are broadened at the end and with hook-shaped process, there is а150 а dark spot on the shoulder and an oblique dash behind the middle at the lateral margin; they are often fused and broadened to such an extent that only a stripe in the anterior half of the disc is left of the yellow background, as well as another stripe in the outer part of the posterior half and a lateral margin. Antennae red, dark in the distal half. Punctation of pronotum fine, slightly stronger between the dashes; elytra with strong, dense dots and with delicate hairs. Length 2—2.2mm. Distribution. USSR: Maritime Territory. Japan, China. Var. trassearti Feng described from China (Tientsin) differs from the typical form in the more parallel sides of the elytra which are slightly narrower posteriorly; elytra yellow, with the following brown pattern: a spot at the base; a sutural stripe; a broad longitudinal stripe, which is connected in the middle with the sutural stripe, shorter anteriorly and broadened posteriorly toward the sides; 2 small spots which are some- times fused and form a second longitudinal stripe; 2 or 3 narrow dashes near the lateral margin. Dorsum with fine network. 3. Bidessus hummeli Falk. Falkenstrom, 1937, Ark. Zool.,27A:6; Gschwendtner, 1939:6. "Oval, oblong, slightly broader in the middle; pronotum yellow; its anterior margin with a narrow dark brown stripe; posterior margin with 120 a broad brown stripe between the dashes; elytra brown, darker or lighter, with a variable, indistinct yellow pattern: a usually constant triangular spot at the apex, a stripe from the middle (sometimes fused with the triangular spot), a spot with 2 short dashes near the base; outer dash often contiguous with the small lateral spot (which does not reach the shoulder). Venter dark brown; prothorax and anal sternite yellow; first sternite or also the other sternites often yellow in the middle. Pronotum with slightly rounded sides; lateral dashes coarse and deep, reaching the middle; prothorax with scattered, fine dots. Elytra with a distinct presutural groove which does not reach the apex or the base; dashes distinct, almost wedge-shaped, longer than dashes on pronotum; the slightly convex field between suture and dashes covered with small, scattered dots; other surface with dense, distinct dots. Dorsum with a delicate network of polygonal loops. Length 1.8—2.1mm"' (after Falkenstroém). Distribution. China (Szechwan). 4. Bidessus licenti Feng. Feng, 1936, Peking’nat. hist. Bull. 11, 1:4; Gschwendtner, 1939:6. "Larger, broader and more flattened than B.japonicus; more strongly narrowed anteriorly and posteriorly; elytra yellow, with the following brown pattern: a narrow spot at the base; a sutural stripe; a longitudinal stripe connected with it in the middle which tapers anteriorly and posteriorly and widens toward the sides; a narrow stripe anterior to this widening which is sometimes divided into 2 or 3 dashes. Pronotum narrower and less convex, less rounded laterally, with much finer and denser punctation, covered more densely with hairs; loops of network much narrower and consisting of thin transverse dashes, especially in the female (the network always consists of loops in B.japonicus); lateral dashes as in B.japo- nicus, but the dashes of the elytra are much shallower. Length 2—2.2 пт" (after Gschwendtner). Distribution. China (Peking, Tientsin).. 5. Bidessus yoshimurai Kam. Kamiya, 1932, Mushi, 5:4; Gschwendtner, 1939:7. "Differing from B.japonicus in the narrower body, the more super- ficial punctation on pronotum and elytra, the weaker lateral dashes on the pronotum. Elytra dark brown, with several yellowish spots anteriorly, in the middle and near the apex. Abdomen blackish brown. Length 1.8 mm.' Distribution. Japan. Gschwendtner considers a specimen from China with an inverse pattern (brown pattern on a reddish yellow background) similar to that of B.japo- nicus (after Gschwendtner) as belonging to this species. 121 117 %6. Bidessus signatellus (Klug.). Klug, 1834, Symb. Phys., IV, t.34,f.3 (Hydroporus); Régimbart, 1895:85; Zimmermann, 1930:48; ab. thermalis Germar, 1838, Fn. Inst. Eur., XX:3; Ganglbauer, 1892:456; Régimbart, 1895:85; ab. tetragram- mus Hochh., 1846, Enum. carab. Hydroc. Cauc. :223. Oblong-oval, reddish yellow; hind coxae and sometimes also metathorax brown; abdomen brownish red. Head and pronotum yellowish red; anterior margin of pronotum with a narrow black stripe; a brown spot on each side of the middle at the base; this spot varies in size and is sometimes absent. Elytra paler, whitish yellow, with a distinct black pattern. This pattern consists of a basal border which reaches the shoulders and some- times forms a spot in the middle, of a presutural stripe from the base to the middle, and of 2 longitudinal stripes on the disc; the inner stripe usually begins slightly before the middle, rarely near the base, runs parallel to the presutural stripe and ends in the form of a knob or an outwards curved hook before reaching the apex; the 2nd (outer) stripe begins at the same level as the first but is much shorter, ends in the middle or slightly behind the middle, straight, slightly widening posteriorly and often also with a small terminal hook which is curved outward; this stripe is rarely prolonged anteriorly until it joins the basal transverse stripe. In ab. ther- malis both stripes are fused for a greater or smaller distance; the posterior end of the inner stripe is sometimes also fused with the pre- sutural stripe. Dorsum with short hairs. Dots on head very small; dots on pronotum small and less numerous on the disc, stronger laterally, small and less dense on the elytra. Lateral dashes on elytra shorter than on pronotum. Specimens with broader stripes on the disc of the elytra and with a lighter coloration of the abdomen have been named ab. tetragram- mus; this is hardly necessary because there are transitional forms to the typical form which occur together with it. Length 1.5—1.8mm. Distribution. USSR: Transcaucasia, Middle Asia. Whole Medi- terranean to Iran and Arabia. #7. Bidessus hamulatus (Gyll.). Gyllenhal, 1813, Ins. Suec., Ш:691 (Hyphydrus); Mjoberg, 1905, Ark. zool., II, 17; Kniephof, 1913, Deutsch. Entom. Zeitschr.:183; Hellén, 1929, Not. entom., [X:35; ab. pomeranus Kniephof, ab. pulchellus Kniephof, ab. huhni Kniephof, 1913, Deutsch. Entom. Zeitschr.:183. This species closely resembles B.signatellus in size, form, coloration, and pattern on the elytra; it differs from it in its denser and stronger punctation, the less shining body and hind coxae, the almost uni- formly colored pronotum (which is dark only in a narrow part at the base), and the shorter hairs on the dorsum. Unlike B.signatellus in which the stripes on the elytra show a tendency to become broader, these stripes show a tendency to become longer. The variants of the pattern are given by Kniephof (14 modifications) and three of them were given names: ab. pomeranus (in which both discal stripes are little prolonged anteriorly and connected posteriorly to form a U); ab. pulchellus 122 118 (in which the outer stripe reaches the base and is either isolated posteriorly or contiguous with the apex of the hook of the inner stripe); ab. huhni (a very dark form) in which the outer stripe is contiguous both with the basal stripe and with the inner stripe at the anterior and posterior end. Length 1.6—1.8mm. Distribution. USSR: Molotov [now Perm] Region. Sweden, Finland, Poland. Sporadically distributed. *8. Bidessus confusus (Klug). Klug, 1833, Symb. Phys.,1V:4 (Hydroporus); Régimbart, 1895:89; Zimmermann, 1930:47; Csiki, 1946:593. Oval, yellowish red; distal half of antennae not dark. Metathorax, hind coxae and abdomen black; head slightly dark posteriorly. Pronotum with a broad, indistinct, brown area between the lateral dashes. Brownish yellow, with an indistinct black pattern which consists of a stripe at the base and along the suture, and of two longitudinal stripes on the disc which are more or less shortened anteriorly, and contiguous before the apex; inner stripe often connected with the presutural stripe by a spot between the two stripes; inner stripe contiguous with the outer stripe also in the posterior half. Punctation of dorsum very fine, indistinct. Length 2mm. Distribution. USSR: Middle Asia. East of Mediterranean, Iran. 9. Bidessus minutissimus (Germ.). Germar, 1824, Ins. spec. nov. :31 (Hydroporus); Ganglbauer, 1892:455; Zimmermann, 1930:50; Csiki, 1946:593.—interruptefasciatus Breit, 1908, Verh. zool.-bot. Ges. Wien, LVIII:59. Small, oblong-oval, with almost parallel sides, flattened, weakly shining, with a few hairs; lateral margin of body with a slight constriction at base of pronotum. This species resembles only B.delicatulus and B.sau- rius; it differs from all other species in the form of the body. Reddish yellow; distal half of antennae and posterior part of head slightly dark; pronotum with a narrow blackish stripe at the anterior margin and witha similar stripe at the base; the black pattern of the elytra consists of a sutural stripe, a broad basal band reaching the lateral margin, and 2 undu- late bands on the disc; first band situated slightly behind the middle, its posterior margin concave and it is broadened in the middle into an anteriorly directed spot; 2nd band also contiguous in its posterior third with the sutural stripe and directed slightly obliquely toward the outside and posteriorly; both bands on the lateral margin are usually connected by a narrow longitudinal dash. The pattern is variable, either becoming broader or reduced; the elytra vary from completely black to very light (in the East). Clypeus anteriorly with a flat anterior ridge which is indistinct in the middle. Vertex, pronotum, and elytra with fine, dense dots; hind coxae with coarser and more scattered dots. Lateral dashes on the elytra long, reaching to the middle of the lateral margin. Presutural incised dash 123 ILA) indistinct behind the middle and slightly shortened anteriorly. Penis tapering apically, slightly lanceolate. Basal segment of parameres broad, slightly longer than apical segment, curved apically. Length 1-1.7mm. Distribution. Central and southern Europe, Palestine. The record from Transcaucasia is erroneous. 10. Bidessus delicatulus (Schaum). Schaum, 1844, Stett. Entom. Zeit.,IV:198 (Hydroporus); Ganglbauer, 1892:464; Zimmermann, 1930:51; Guignot, 1947:265. More flattened and oblong than B.minutissimus, lighter; apical half of antennae hardly dark; sides of anterior half of pronotum less rounded; posterior part of elytra more pointed and for a greater distance; bands on elytra narrower and less dark; black basal stripe reaching only to the lateral dashes. | Hind coxae more finely puncrate. "ШЕЯ I бана Distribution. Central Europe, Sicily, Dalmatia, Greece, ?Asia Minor (Sahlberg). Not yet found in the USSR, but it probably occurs in the Ukraine. 11. Bidessus saucius Desbr. Desbrochers, 1871, Mitt. Schweiz. Ent. Ges., Ш:338; Régimbart, 1895:83; Zimmermann, 1930:51; Guignot, 1947:266; subsp. coxalis Sharp, 1880—82: 352; Ganglbauer, 1892:455; Régimbart, 1895:83; Zimmermann, 1930:51; Guignot, 1947:266; ab. sexguttatus Zimmermann, 1930:51; Guignot, 1947:266. Closely related to B.minutissimus Germ. Almost regularly oval; lateral margin without constriction or with a slight constriction at the base of the pronotum; brownish red; pubescence on dorsum sparse, hardly recognizable. Ridge at anterior margin of clypeus weakly marked, but more distinct than in B.minutissimus, especially lateral to the middle. In the typical form (B.saucius Desbr.), pronotum blackish, with a yellowish brown transverse stripe in the middle; elytra black, without spots or with several diffuse, small brown spots. In the subspecies coxalis Sharp, pro- notum black only at the anterior and posterior margins, and the pattern of the elytra resembles that of Bs.minutissimus,in ab. sexguttatus (described from one specimen), black pattern of the elytra reduced to a sutural stripe which is slightly wider in the middle and is surrounded by 6 round spots. Penis long, uniformly tapering apically. Both segments of parameres of equal length; basal segment with a membranous widening; apical segment curved in form of a beak. Length 1.5—1.7 пота. Distribution. The nominate subspecies occurs in Spain, northern Italy (including the islands), French Pyrenees; the subspecies coxalis Sharp occurs in France, Italy, and the other part of the Mediterranean to Syria and Asia Minor. 5917 124 120 *12, Bidessus unistriatus (Schr.). Schrank, 1781, Enum. №5. Austr. :205 (Dytis cus); Ganglbauer, 1892:455; Zimmermann, 1930:53; Csiki, 1946:594; Guignot, 1947:268; ab. opacus Gehrhardt, 1910, Verz. Kaf. Schles.:38; ab. subrufulus, female; Schneid, 1898, Abh. Bremen, XVI:50, Guignot, 1947:268; ab. maurus Everts, 1918, Ent. Ber. Neerl., 5:7; Guignot, 1947:268. Short-oval, broader inthe middle, tapering posteriorly, slightly convex, brownish red; head blackish brown, slightly lighter anteriorly; punctation sparse, irregular on the usually reticulate background; antennae black; first 4 antennal segments brownish yellow. Pronotum red; anterior and posterior margin of pronotum black; lateral dashes slightly curved; punctation between the dashes stronger. Elytra dark brown, with rust- colored spots at the sides (f.typica) or uniformly rust-colored (ab. sub- rufulus) or uniformly black (ab. maurus); lateral dashes slightly longer than on the pronotum, reaching almost to ah of the elytra; presutural dash not reaching base and slightly curved outward. Punctation fine and dense, slightly more marked and scattered between the lateral dashes and the presutural dash. Hind coxae and first abdominal sternite with coarser dots. Penis with almost parallel sides in the basal oat then tapering to the apex. Parameres with broad and long basal segment; apical segment shorter, narrow, with a small hook. Females dimorphous: either shining like the male or (rarely) mat dorsally and ventrally (ab. opacus), witha silky sheen, with delicate indistinct network and a slightly impressed presutural dasha Wength 1. 7--2' mma. Distribution. Northern and central belt of the European USSR. Whole Europe, especially common in the north. *13. Bidessus grossepunctatus Vorbr. Vorbringer, 1907, Deutsch. Entom. Zeitschr.:418; Zimmermann, 1930:54; Csiki, 1946:594; Guignot, 1947:65. This species differs from B.unistriatus as follows: middle of anterior margin of clypeus with two flat tubercles and thickened lateral to the antennae (as in B.nasutus); this is never the case in B.unistria- tus, Punctation of elytra between presutural dash and the lateral dashes much coarser and more scattered than in B.unistriatus; dorsum more shining, lateral dashes on the elytra markedly longer, body broader in the middle, distinctly narrower anteriorly and posteriorly, so that the body is slightly rhomboidal. Penis narrower, more strongly pointed anteriorly; its apical half more strongly curved. Both sexes shining. Length 1.9—2 mm. Distribution. USSR: Ukraine, Novgorod Region. Central Europe (possibly common; however, it has been confused with B.unistriatu ЗЕ *14. Bidessus nasutus Sharp. Sharp, 1887, Wien. Entom. Zeitg., VI:170; Zaitsev, 1906, Russkoe Ento- mologicheskoe obozrenie, VI:174; Zimmermann, 1930:56; Csiki, 1946:595. 125 121 Reddish yellow, shining. Anterior margin of pronotum with a narrow dark stripe; posterior margin with a broad black stripe which reaches the lateral margin. Elytrausually with a distinct pattern; black transverse band at the base broad, with undulate posterior margin; discal common spot beginning in the middle and not reaching the apex, with an oblique process directed outward and posteriorly in its anterior part which almost reaches the lateral margin. Presutural dash not reaching suture, turning laterally, incised, withirregular outline so that the dots in it appear like serrations. Lateral basal dashes three times as long as dashes on pronotum. Dots on elytra distinct, not less distinct than in B.un istriatus, and much more widely separated. Penis uniformly and gradually tapering, with a sharp lateral rim. Length 2mm. Distribution. Widely distributed in eastern Europe, from Vienna and Dalmatia, through the steppe belt of the European USSR and eastern Transcaucasia to Western Siberia and Middle Asia. 15. Bidessus exornatus (Reiche). Reiche, 1855, Ann. Soc. Entom. Fr. (3) 11:644 (Hydroporus); Apfelbeck, 1904, Kaf. Balkanhalbins. :367; Zimmermann, 1930:54. The uniform, dense punctation and the pattern on the elytra distinguish this species from the other species. Broadly oval; head and pronotum reddish yellow; base of pronotum with a brown spot lateral to the middle. Elytra of male shining, those of female less shining; elytra with short gray hairs, dark brown; the following areas on the elytra reddish yellow: the lateral field and the band connected with it before the middle (often divided into 3 separate spots), three small spots behind the middle (outer spot displaced posteriorly), and a spot on the apex. Pattern not very prominent on the dark background, often very indistinct, more or less diffuse. Pronotum with dense, small dots which are slightly stronger between the dashes; these are slightly obliquely directed inwards and do not reach the middle. Elytra with coarser dots; presutural dash disappearing behind the middle, oblique, almost reaching the base, and curved outward. Length 2—2.2 mm. Distribution. Eastern Mediterranean to Turkey and Syria. *16. Bidessus alienus Zimm. Zimmermann, (1917) 1919, Arch. Naturgesch., 83, A, 12:140; 1930:57. Resembling B.exornatus in the pattern on the elytra; however, it differs from this and from all other Russian species in the absence of an incised presutural line. Oblong-oval, slightly convex; head and pronotum reddish yellow; pronotum with a narrow brown border at the anterior margin and a broad border at the base, between the dashes. Elytra blackish brown, with fine, yellowish white hairs; lateral field, two bands, and the apical spot reddish yellow; first band with serrated margin near the base, sometimes divided into spots, usually connected with the lateral border and not quite reaching the suture; second band behind the middle always 126 separated from the lateral border; it is usually divided into 3 longitudinal spots, the median spot displaced anteriorly, the outer spot connected with the apical spot by a longitudinal dash. Clypeus inflated near the anterior margin and laterally, but middle of margin flat; Lateral dashes on pronotum reaching almost to the middle, oblique, forming an obtuse angle with the dashes of the elytra which are also obliquely directed inward. Presutural dash absent, rarely represented by a weak, short depression along the suture. Male. Dorsum shining, only head weakly shagreened. Punctation of elytra gradually weaker laterally and toward the apex; punctation absent ina narrow stripe along the suture. Female. Dorsum uniformly shagreened, less shining, with a weak silky sheen. This species differs from B.exornatus as follows: absence of pre- sutural line, less convex body, and smaller size and sculpture of the clypeus. wensth 1.8—2 mim. Distribution. Yugoslavia, south of the European USSR (to Saratov) and eastern Transcaucasia to the steppes of Western Siberia and Turkmenia. 17. Bidessus maculosus Gschw. Gschwendtner, 1931, Entom. Anzeig., XI, No.23; Gschwendtner, 1939:7.— tokunagai Kam. 1932, Mushi, 5:5. Broader and more flattened than B.megacephalus; brownish yellow; elytra with a serrated, reddish brown spot in the middle and near the apex which is sometimes diffuse; venter reddish brown; abdomen and prothorax yellow. Pronotum short, with parallel sides posteriorly. Lateral dashes very deep; base between dashes depressed; the dashes continue on the elytra in the form of straight lines which are slightly directed inward. Punctation of elytra strong and denser thanin B.megacephalus. Hind coxae and first two sternites with strong dots. Length 2.7—3.2 mm" (after Gschwendtner). Distribution. Japan, South China. 18. Bidessus megacephalus Gschw. Gschwendtner, 1931, Entom. Anz., XI, No.1; idem, 1939:7. "Oblong-oval, convex, reddish yellow; elytra slightly darker; hind coxae and abdominal sternites (except the first) brown. Head large; pronotum very long; sides of pronotum strongly curved anteriorly, straight posteriorly, narrower than elytra; lateral dashes very deep, long, directed obliquely inward; their continuation on the elytra is less deep, straight and shorter. Antennae thick. Head with a network; other part of dorsum smooth, but pronotum with strong, dense dots; elytra with stronger and denser dots. Length 3—3.25 mm" (after Gschwendtner). Distribution. Kotomo (?Japan), Java. 127 123 7. Genus Yola des Gozis Des Gozis, 1886, Rech. esp. typ. :8; Guignot, 1947:60; Zimmermann, 1930:58.— Anodocheilus Ganglbauer, 1892:454. Туре SoSsCiess Муш In VCe ета а: Body broadly oval; dorsum strongly convex. Sides of base of pronotum with a dash which continues on the base of the elytra. Disc and sides of elytra with a small ridge which is short posteriorly and sometimes accompanied with 1 or 2 weak ridges lateral to it. The genus contains over 20 species mainly in the Ethiopian Region; one species occurs in the Mediterranean. 1. Yola bicarinata (Latr.). Latreille, 1804, Hist. nat. ins., VIII:179 (Dytiscus); Ganglbauer, 1892:179; Zimmermann, 1930:59; Guignot, 1947:61. Short and broadly oval, reddish yellow; anterior margin of pronotum with a narrow black border and with a broad black border at the base; elytra with the following black pattern: a stripe at the base which does not pass beyond the first dorsal ridge, suture, two serrated bands, and apex of elytra; anterior band broadly fused with the suture; it has an anterior and a posterior process along the ridges; it almost reaches the lateral margin lateral to the ridges; posterior band situated in the posterior third, narrower than the anterior band; pattern variable. Pronotum and elytra with strong, dense dots. Each elytron with 2 strong ridges which are interrupted behind the middle; there is sometimes also a third short ridge near the lateral margin. The area between the suture and the first small ridge is strongly depressed. First three segments of the fore and mid tarsi of male slightly broadened. Distribution. Southern and Western Europe, to the Netherlands and Austria in the north; North Africa. 8. Genus Clypeodytes Reg. Régimbart, 1894, Ann. Soc. Ent. Fr. LXIII:230; Zimmermann, 1930:41. Type species: Hydroporus cribrosus Schaum. Body short, broadly oval. Anterior margin of clypeus semicircular, almost always with a small border, which is sometimes weak. There are about 40 species in the tropical and subtropical regions; some of them have been described from China and Japan; however, they are either little known, or their description is so incomplete that it is impossible to give a key. We give only the original descriptions. 1. Clypeodytes frontalis (Sharp). Sharp, 1884, Trans. Entom. Soc. London:440 (Bidessus); Zimmer- mann, 1930:42. 128 "Short-oval, convex, reddish, shining; apex of antennae, abdomen and elytra brown; elytra apically and laterally with an indistinct yellow pattern and with coarse dots. Clypeus with a small border anteriorly. Length Бот и зьетьитом. "Таран. 2. Clypeodytes perforatus (Sharp). Sharp, 1880—1882:363 (Bidessus); Zimmermann, 1930:42. 'Clypeus thickened anteriorly; its border hardly marked. Oblong-oval, short, reddish yellow; elytra dull yellow, with indistinct diffuse brown speckles, with coarse, dense dots, almost without hairs. Hind coxae and first abdominal sternites coarsely punctate laterally. Length 2mm." Distribution. China. 3. Clypeodytes gracilis Gschw. Gschwendtner, 1932—1933, Peking nat. hist. Bull. :162; 1939:5. Oblong-oval, narrower posteriorly than anteriorly. Clypeus distinctly raised anteriorly but without a border; head and pronotum grayish yellow; apical half of antennae dark; two indistinct, small, brown spots inside the lateral dashes on the pronotum; elytra slightly darker; suture, several spots at the base between the dashes, and the common spot in the middle of the suture not always distinct; small spots at the sides anteriorly and posteriorly (near the shoulder) and near the apex brownish; venter and legs reddish yellow; hind coxae and first sternites darker; pattern varying toward darker or lighter coloration. Lateral dashes on pronotum deep, reaching almost to the middle, curved inward; dashes of elytra 1.5 times as long, almost straight, with a well marked ridge, but without a depression behind the shoulders. Punctation of elytra coarse and dense, dots smaller laterally and toward the apex. Length 1.6—1.75 mm. овом Сыма, 1 af 6. Tribe HYDROPORINI Sharp, 1880—1882:389; Zimmermann, 1930:61; Csiki, 1946:595; Guignot, 1947:67. End of processes of hind coxae (Figure 45) not situated in the same plane as the first abdominal sternite but slightly above it; they project into diverging, more or less long, small lobes which cover the base of the trochanters. Hind claws equal. Penis simple, flat; parameres usually wing-shaped and similar. The tribe consists of about 20 genera distributed throughout the world. 129 125 а е Е g FIGURE 45. Processes of hind coxae of Hydroporini: а —genus Hydroporus $. str.; b — subgenus Hydroporinus; с —Graptodytes, Porhydrus; 4 — Меорогиз; е — Гас- cornis; f—-Deronectes; g —Potamonectes, Oreodytes. Key to Genera (а 218 (3) 3 1 (2) т) 5 (6). 6. (5). И (О). 8 (13). 912). 10 (11). 11 (10) 12 (9) 13. (8) 14 (15) 15 (14) Ley (Ge) Clypeus with a rim at the anterior margin. Anterior margin of clypeus rounded. Pretarsus of fore and mid tarsi as long as the preceding segment (including the small lobes) вы Пао Gere od о, mins GARD LAR ipa eC MS RoE Atty te 9. Hygrotus Steph. Anterior margin of clypeus with a weak, curved indentation. Pre- tarsus shorter: than the’ ркесечиаэ ава зелень 13). 1.40088: О О ОВО В eve Chto a Gan О ООВ ig ba Ока 10. Hypophorus Sharp. Clypeus without a distinct rim at the anterior margin. Epipleura of elytra with an oblique ridge at the base; a pit inside to this ridge in which the knees of the midlegs are placed...... SIG An Chon nb bona а о cae anno! В 11. Coelambus Thoms. Epipleura without ridge and pit. Pronotum and elytra smooth, with a weakly marked fine network. Pronotum without a short dash on the sides of the base. Elytra without black longitudinal lines on a light background. Pronotum projecting in a distinct angle in the middle of the base. Antennal segment 4 much smaller than the segment5......... В о В 12. Hydroporus Clairv. Base of pronotum almost straight. Tarsal segment 4 as long as Scoment oom аиао`-вая То 13. Laccornis Goz. Elytra reddish yellow, with black longitudinal lines .......... а ea neuen ee 15. Scarodytes Gozis. Pronotum with lateral dashes which are sometimes weakly marked. Antennal segment 4 markedly shorter than adjacent segments. Fateral dashes on pronotum чаев: 14. Graptodytes Seidl. Antennal segment 4 as long or almost as long as adjacent segments. Lateral dashes on pronotum weakly marked .. 16. Oreodytes Seidl. Background of pronotum and often also of the elytra shagreened or finely punctate. 130 17 (18). Antennal segment 4 much shorter than adjacent segments. Dorsum shagreened. Pronotum without lateral dashes. Elytra reddish yellow with black longitudinal lines ...... 17. Porhydrus Guign. 18 (17). Antennal segment 4 almost as long as adjacent segments. Venter \ finely punctate. 19 (24). Punctation of elytra double: in addition to the finely punctate back- ground, elytra also with scattered coarse dots. Processes of hind coxae with an oblique indentation at the end (Figure 45). 20 (21). Process of prothorax laterally compressed, with a keel in the та е Bead absence ces! al oh teste Ча 19. Deronectes Sharp. 21 (20). Process of prothorax flat, plane in the middle or with a more or less marked keel. 22 (23). Processes of prothorax flat, broad, without longitudinal depression, UMC EAES) FRAIL Us "ACh eel tealet ое Ооаты. 293 18. Stictotarsus Zimm. 23 (22). Process of prothorax broadly oval, spoon- shaped, bluntly pointed or rounded, at the end, with a weak rim at the sides .......... 0, 0 Jay, Or sacra NR as ote ВН Би Оч elmer i 20. Neonectes Zimm. 24 (19). Punctation of elytra simple (in addition to the usual 2 or 3 longi- tudinal rows of dots). End of hind trochanters normal, without INGENtATIONT BOT TO. SANG. LORS kp ана 21. Potamonectes Zimm. 9. Genus Hygrotus Steph. Stephens, 1928, Ill. Brit. Entom., П:46; Ganglbauer, 1892:449 Zimmermann, 1930:78; Csiki, 1946:601; Guignot, 1947:95. Dypevspecies:s Diytis осы: ва аеаща 1 isi habit Body broad and short, strongly convex. Anterior margin of clypeus with a complete rim. Epipleura of elytra with an oblique ridge or keel at the base; this ridge delimits a pit in which the knees of the midlegs are placed. The 2 longitudinal rows of dots on the elytra are usually strongly reduced. Larva. Head narrow; frontal horn always with a deep indentation at the sides and with a denticle. Last abdominal segment with a long terminal process. Cerci two-segmented; lst segment of cerci shorter than 2nd, with (setae. Pupa resembling that of Coelambus, only pronotum slightly less tapering posteriorly, The genus contains about 12 species which are distributed only in the Holarctic Region. 126 Key to Species 1 (10). Punctation of elytra uniformly strong to the apex. 2 (3). Smaller,2.5mm. Head with fine, scattered dots; depressions near eyes weak, widely separated. Elytra black, with reddish Vellowpspote® Е №. Мл. ба оао в *1. Н. decoratus (Gyll.). 3 (2). Larger,3—3.5mm. Head with broad, deep depressions which are contiguous near the eyes; head with dense, coarse dots. 4 (7). Rim at anterior margin of clypeus thin. Elytra with black pattern of spots. 131 127 5 RES RO BN EET Weis Nepean et we A о i 3. Н. aequalis Falk. 7 (4). Rim of clypeus thicker. Elytra reddish yellow with 3 black longi- tudinal stripes. 8 (9). Pronotum and elytra with small, dense dots; anterior half of elytra also with large, scattered dots. Epipleura with fine, dense dots. . Fh LO RRA NAGS RUE OE Mai *4, H. versicolor (Schall.). 9 (8). Disc of pronotum with fine, scattered dots. Elytra with strong, irregular punctation with a few additional small dots in the anterior нам. -Epipleura with large notmunierous Чо: Ев: ES ERSeL SISO 2 VG NOE PAUCITY О RANTS ube *5, H. quinquelineatus (Zett.). 10 (1). Punctation of elytra strong and dense, but almost disappearing пеаунечарея "моя уе ое 6. Н. discedens Sharp. Key to Known Larvae 1 (2). Frontal horn moderately large; spines of ridge with multiple end Е А *2, H. inaequalis (Fabr.). 21) Hornushortiandsbroads) spines) of ridge заре sane een ene С И *4. Н. versicolor Schall. *1. Hygrotus decoratus (Gyll.). Gyllenhal, 1810, Ins. suec., II, Add.:16 (Hyphydrus); Ganglbauer, 1892:451; Zimmermann, 1930:79; Csiki, 1946:603; Guignot, 1947:75; ab. unicolor Schilsky, 1888, Deutsch. Entom. Zeitschr., XXXII:183; Guignot, 1. с. Differing distinctly from the other species of the genus in form, size, and pattern of the elytra; the pattern resembles that of Graptodytes pic- tus. Broadly oval, broadest in the middle, uniformly narrowing anteriorly and posteriorly. Head and pronotum uniformly reddish or pronotum dark anteriorly and posteriorly (sometimes completely dark). Elytra dark brown; lateral border near the shoulders and behind the middle (which expands into a spot toward the inside) and a large rounded spot at the base, which is usually fused with the lateral border, are reddish yellow; yellow pattern on the elytra sometimes strongly reduced and only a narrow lateral border remains light in color (ab. unicolor Schil.). Head with a narrow shallow depression lateral to the eyes, with thin, sparse dots, especially in the anterior half. Punctation of pronotum scattered and fine on the disc, denser and stronger anteriorly and posteriorly. Elytra with irregular, not very dense punctation consisting of strong dots interspersed with fine dots. Hind coxae and sides of abdominal sternites 1—2 with coarse dots. Penis short and broad, sharply tapering near the apex. Parameres strongly convex in the middle of the dorsal side. Bengeth'2—2)o mim Distribution. European USSR, Siberia. Europe, except in the south. Ecology. Occurring in clean and cool water. 132 *2. Hygrotus inaequalis (Fabr.). Fabricius, 1777, Gen. Ins.:239 (Dytiscus); Ganglbauer, 1892:450; Zimmermann, 1930:80; Csiki, 1946:603; Guignot, 1947:76; ab. parvulus Fabricius, 1792, Ent. Syst.,1:201; Guignot, 1947:76; ab. fasciatus D.-Torre, 1877, Jahresb. Ver. Nat. Oesterr., VIII:59; Guignot, 1947:76; subsp. dalmatinus Zimmermann, 1915, Entom. Ва. 91:28). Short, broadly oval, yellowish red; the following areas black: a narrow area at the base and at the anterior margin of the pronotum, base of elytra, the suture, and a very variable pattern on the disc; when the common pattern is present, only a broad irregular lateral border is left of the reddish background color; this border projects in a serrated transverse band near the base toward the inside and is broadened into a spot behind the middle; the black discal spot is sometimes divided into 2 longitudinal stripes (ab. parvulus), the inner stripe more or less fused with the sutural stripe and reaching almost to the apex and the outer stripe ending behind the middle and curved outward at the end; the black coloration is sometimes predominant, leaving only a spot near the base and a lateral margin of the background color (ab. fasciatus). Rarely, there are also other variants of the pattern. Head with 2 deep, oval depressions with strong and dense dots, like the pronotum. Elytra with uniform, coarse, dense dots (f. typica) or dots irregular at least in the anterior half, larger or smaller (subsp. dalmatinus Zimm.). Penis long and thin, gradually tapering to the pointed apex. Parameres broad in the middle. Length 2.7—3.7 mm. Distribution. Whole Palearctic Region; subspecies dalmatinus Zimm. occurs in the Mediterranean. Common. 3. Hygrotus aequalis Falk. Halkenstrom, 1938, Ark: “Zool., 27 A; 1:11; Gschwendtner, 1939-10. According to the description, this species resembles H.quinqueli- neatus Zett. inform of the body, but is larger and more rounded pos- teriorly; coloration of dorsum resembling that of H.inaequalis (Fabr.). The pattern of the elytra consists of black stripes at the base and suture and of 2 broad transverse black bands of different width which are serrated and variable in form; one of them, situated before the middle, is usually contiguous with the sutural stripe and the dark lateral margin; the other is situated in the posterior third of the elytra, not reaching the suture or the lateral margin. Length 3.25—3.5mm. (There are no other differences from H.inaequalis in the original description.) Distribution. China: Szechwan. *4, Hygrotus versicolor (Schall.). Schaller, 1783, №. Schrift. Nat. Ges. Halle, 1:313 (Dytiscus); Gangl- bauer, 1892:451; Zimmermann, 1930:81; Csiki, 1946:603; Guignot, 1947:77; ab. collaris Panzer,1794, Fn. Germ. Ag.:t. 4; Guignot, 1947:77; i28ab semilineatus: Zimmermann, 1915, Ent.) Blatt.,; 2:218; ab. con - junctus Munster, 1932, Norsk Ent. Tidskr., I1:83. 133 Short-ovoid, yellowish red, with a black pattern оп the elytra. Head of uniform color, with fine, dense dots. Pronotum narrowly black in the middle of the anterior and posterior margin, with a punctation as on the head. Elytra with a black pattern consisting of a band at the base which does not reach the shoulders, a sutural stripe, and 4 longitudinal stripes which are more or less broad; 1st and 3rd stripe reaching almost from the base to the apex; 2nd stripe present only in the last third; last stripe very short; 1st and 3rd stripes sometimes interrupted (ab. collaris); all 4 stripes rarely short and absent in the posterior half (ab. semilineatus) or lines fused (ab. conjunctus). Punctation on the elytra double: principal punctation dense and fine, and interspersed with isolated coarse dots. Penis with a weak, broad indentation in the 2nd third; apex of para- meres very broad; their dorsal rim with short cilia. Length 3—3.6mm. Distribution. European USSR, Siberia, Transcaucasia. Northern and Central Europe. *5. Hygrotus quinquelineatus (Zett.). Zetterstedt, 1828, Fn. Lappon. :234 (Hyphydrus); Ganglbauer, 1892:451; Zimmermann, 1930:82; ab. disjunctus Munster, 1932, Norsk Ent. Tidskr., 3:83; Gschwendtner, 1939:10. This species resembles H.versicolor in size, form, coloration, and pattern on the elytra; it differs from it in the sculpture of the dorsum. Punctation of pronotum stronger, more scattered; it consists of dense, coarse dots interspersed with a few fine dots on the elytra. Thorax and base of abdomen with coarse dots; apex of abdomen with fine, scattered dots. Ovoid, strongly convex, reddish yellow; the pattern on the elytra is usually as in the typical form of H.versicolor. Black lines sometimes strongly reduced (ab. disjunctus). Length 3—3.5 mm. Distribution. Northern and central belt of the European USSR, Siberia. Northern and Central Europe. Rare, like H.versicolor. 6. Hygrotus discedens Sharp. Sharp, 1880—1882:396; Zimmermann, 1930:79. Oval, convex, shining, with thin, sparse hairs, reddish brown; the following areas pale reddish: sides of pronotum, a large diffuse spot at the base of the elytra in the outer half, and a spot near the apex. Dots on disc of pronotum scattered, denser along the margin and dense and coarse on the elytra; they disappear near the apex. Dots very coarse on hind coxae and sides of the 1st abdominal sternite. Length 3.5 mm (after Sharp). Distribution. East China. 134 129 10. Genus Hypophorus Sharp Sharp, 1880—1882:390; Zimmermann, 1830:83; Falkenstrom, 1933, Ark. HOO en? lac А:3. Type species: Hydroporus musicus Kl. Body broadly oval, convex. Clypeus weakly curved or straight in the middle of the anterior margin. The genus contains a few species in tropical Asia and Africa; 2 or 3 species have spread into adjacent parts of the Palearctic Region, and one occurs in the USSR. *1. Hypophorus musicus (Klug). Klug, 1833, Symb. Phys., IV:t. 33, f.12 (Hydroporus); Régimbart, 1899:201; Zimmermann, 1930:84.— fractilinea Solsky, 1874, Puteshestvie Turkestan, Fedchenko, 11(5):134. Short-oval, shining, reddish yellow; in the male, thorax, hind coxae, and abdomen black (sometimes only the abdomen). Base of pronotum (some- times also anterior margin) narrowly dark; elytra with black suture, black base, and 4 or 5 black longitudinal lines; lines 1—2 interrupted once, line 3 interrupted twice; if present, line 4 shortened anteriorly, interrupted behind the middle, and often represented by an oblong spot; line 5 in the form of a short dash, usually absent. Venter with coarse, dense dots; only epipleura and posterior part of abdomen with small dots. Fore and mid tarsi of male slightly broadened, slightly broader than in the female. Body more strongly narrowed anteriorly and posteriorly. Body of female more broadly oval, less tapering anteriorly and posteriorly. Punctation of dorsum denser, more uniform on the elytra. Punctation very variable. Specimens from Trans- caucasia and Middle Asia smaller and with a more reduced black pattern on the dorsum; however, typical specimens occur together with them. Mengthi2.0- 0.2 mara. Distribution. USSR: Transcaucasia, Middle Asia. Canary Islands, North Africa, Southwest Asia, Iran, India. 2. Hypophorus rotundatus Gschw. Gschwendtner, 1931, Entom. Anz., XI, No.1; idem, 1939:11. Resembling H.rufus Cl., but differing from it in the distinct network, the lighter color of the background, and the more distinct longitudinal lines. Head and pronotum with coarse, sparse dots; elytra with coarse, dense dots. Venter more coarsely punctate; first 4 abdominal sternites with coarse wrinkles. Length 4.25mm. Distribution. Japan (after Gschwendtner). 135 130 11. Genus Coelambus Thoms. С. а. Thomson, 1860, Skand. Col., 11:13; Ganglbauer, 1892:450; Zimmer- mann, 1930:61; Csiki, 1946:597; Guignot, 1947:71. Type species: Dytiscus confluens (Fabr.). Body at most 6mm long, more or less oblong, oval. Clypeus without rim at the anterior margin. Elytra with black longitudinal lines of varying thickness and length, or with spots, rarely without spots, uniformly yellow or reddish, yellow, rarely dark brick-red; usual longitudinal rows of dots present or absent. Lateral wings of metathorax tongue-shaped, curved. An oblique dash and a small pit before it at the base of the epipleura. The secondary sexual characters of the male consist only in the form of the fore claws. Penis with strongly developed basal part; parameres thick, their basal part long and thin. Larva. Body almost cylindrical, tapering posteriorly. Frontal horn of varying form, but always with a lateral indentation. Abdominal segment 8 with a cylindrical or conical process. Cerci short, with 7 primary setae: 6 on the first segment and one near the end of the second segment; there are sometimes also secondary setae, or cerci longer, with numerous setae. Pupa. Pronotum transverse, narrower anteriorly. Abdomen slightly flattened; anterior tergites with only 3 median setae close to each other. Living instagnant water; however, some species occur in brackish water. The genus contains about 60 species; its distribution is restricted to the northern temperate zone; it is especially well represented in the Nearctic Region. Key to Species Some species have dimorphous females: one form is shining like the male and the other mat. We give below a separate key for the mat forms. Males and shining females 1 (32). Lateral margin of elytra rising to the shoulder in a sloping curve. Basal half of epipleura of elytra relatively broad. Cerci of larvae with only 7 setae. 2 (3). Epipleura with dense dots. Third segment of fore and mid tarsi of male markedly less broad than the two preceding segments; fore claws strong, longer than pretarsus ..*1. С. polonicus (Aubé). 3 (2). Epipleura not punctate or with isolated dots. Third tarsal segment of male as broad as the two preceding segments. Claws short. 4 (25). Punctation of elytra double in basal half of elytra: isolated small or very small dots among the numerous more or less coarse dots. 5 (12). Hind coxae and first abdominal sternites with coarse dots laterally. Punctation in posterior half of elytra denser than in anterior half. 6 (9). Hind coxae and abdomen distinctly shagreened between the dots. Punctate grooves in anterior half of elytra strongly impressed or incised. 136 17 (16). 18 (15). Dots in anterior half of elytra coarse and very deep, in form of [OOS ак SoG oo) 5 А 6 ol oF oa B 6 jg ceobo iG) Oo b BAe Ц aoe *2. C.impressopunctatus impressopunctatus (Schall.). Dots in anterior half of elytra less strong, simple, more widely SCatlereciians в: 2a. C.impressopunctatus roborovskii, subsp. п. Hind coxae and abdomen not shagreened, strongly shining. Rows of dots on elytra weakly impressed or more or less indistinct. Body oval, not very narrow posteriorly. Black lines on elytra distinct, usually separate to the apex or slightly broadened posteriorly fand contiguous! 20.2 tills. а: 3. C. chinensis Sharp. Body ovoid, narrower. Black lines in anterior half more or less short, not sharp, usually fused into a diffuse dark area in the БОБЕР в BIEN OI sO. BUI. Gl *4. C.vittatus Sharp. Hind coxae and abdominal sternites with fine dots. Body oblong; sides slightly rounded. Body markedly oblong. Pronotum with almost parallel sides, slightly tapering anteriorly. Head large. Anterior half of elytra with dense, fine dots interspersed with a few small dots. Sides of body markedly rounded. Black lines 1—3 on elytra less short anteriorly; line 2 reaching almost to the base. Punctation of elytra finer and denser, coarser on the pronotum; sides usually with dots which often form wrinkles in some places. Head with a narrow dark area on the vertex or uniformly reddish yellow. Spot on disc of pronotum diffuse or absent. Sides of body almMOstepacailelea ни ее. ms %5. С. parallelogrammus (Ahr.). Punctation of elytra markedly stronger; dots sparser than in C.parallelogrammus. Head broadly black posteriorly, especially near the eyes; spot on pronotum sharp. Sides of body 1е55 рагаМе Gr нм %6. C.armeniacus Zaitz. Anterior third of elytra with fine, small dots interspersed with isolated dots which are coarser thanin C.parallelogrammus. Sides of body almost parallel. Narrower and smaller. Black lines 1 and 3 of elytra (often also line 2) markedly shortened anteriorly; line 4 broad and usually fused with line 3 in the anterior and in the posterior half. Spot on disc of pronotum ее Fee Ge WEE, О.Н. IS Nba * 7, C.lernaeus (Schaum). Body shorter, smaller, less oblong. Pronotum markedly narrowed anteriorly. Head small. Dotsin anterior half of elytra stronger and sparser than in C.parallelogrammus; small dots between Chem Spawserin о о Nie eels 8. C. semenovi Jak. Body broad, oval; sides of body strongly rounded. Pronotum strongly narrowed anteriorly. Antennal segments 3—4 short, half as long as segments 2 or 5. Venter shining, not shagreened. Anterior half of elytra with sparse, ее sah wel aS eh aS *9. С. corpulentus (Schaum). Venter distinctly shagreened, almost mat; dorsum less shining. Anterior half of elytra with coarser and denser dots ......... pe MARY С CO И SM A ИИ *10. C. saginatus (Schaum). Antennal segments 3—4 as long as the 5th. Body shorter and smaller. aGolor,of dorsum, lighter, strawjyellow jj... еее GENRES pa rama Pe ea LA Lona IP о *11. C.urgensis Jak. 137 132 133 41 (40). Punctation of elytra simple on the whole elytra, without scattered small dots between the coarser dots. Elytra with 4 longitudinal black lines, sometimes with traces of a 5th line in the posterior half. Smaller (3.5—4mm). Pronotum slightly narrowed anteriorly Я а iy hehe *12. C.novemlineatus (Steph.). Larger (5—6 пп). Pronotum more strongly narrowed anteriorly SUNN ir ba eM TAL AL ба в kag ОС № *13. C.mongolicus Jak. Elytra with only one longitudinal stripe near the suture and with spots lateral to the suture, or both elytra with a common diffuse spot, or black pattern absent (only suture dark on the brownish yellow background in this case). Base of pronotum more or less broadly black; elytra with a large diffuse black spot or only suture dark ....%*14. C.marklini (Gyll.). Pronotum uniformly reddish yellow. Elytra with black suture, a longitudinal stripe near it, and 2 spots on the disc, lateral to the Si al OX SU ее 15. C.inscriptus Sharp. Lateral margin of elytra steeply rising to the shoulder. Epi- pleura of elytra narrow in basal half. Cerci of larvae with numerous setae. Elytra finely and densely punctate; disc also with numerous, coarse scattered dots. Dise of pronotum with a black spot. The 4 black lines reach close forthe basset! de sats essai oe *17. C.nigrolineatus (Stev.).* Pronotum without black ре: Black lines short, present only in the posterior half. Body shorter ...... *18. C.confluens (Fabr.). Elytra densely and finely punctate, but without coarse scattered dots or with a few coarse dots (but only in region of scutellum). Venter with strong or coarse dots. Head uniformly reddish; dots on head more widely separated than Опека Wi Sok AR ets |b ee ete.) rd hss pie *19. С. pallidulus Aubé. Head dark posteriorly (near the eyes); vertex with coarser and denser dots than on elytra. Black lines on elytra more or less reduced; the lines do not reach beyond the anterior half, except second line; they are thin, usually divided into parts. Disc of elytra without coarse dots, or 1 ог 2ycoarseldots in the, res1on ое! еее Иа. Eyenae. (ne ened а rR i *20. C.caspius (Wehncke). Black lines usually broad, reaching far into the anterior half; ends of all lines or of 2 or 3 lines fused in the posterior half. Dots of the 1st row of dots and presutural row near the scutellum coarse and present in the interval between the rows (but less numerous пан мм ©, сом ешь) Ив не *21. С. reitteri Zaitz. Venter delicately punctate; dots hardly recognizable. Black lines on elytra usually little shortened, reaching close to the base. Head and pronotum with the same delicate dots as on the elytra. Head with delicate dots, without coarse, scattered dots. Abdomen of female and hind coxae black..... *22. С. enneagrammus (Abhr.). * 16. C.uzbekorum, see below, pp.139, 147. 138 45 (44). 46 (43). In addition to the delicate dots, head also with coarse, scattered dots. Abdomen of female yellow ....*23. C.pectoralis (Motsch.). Black lines on elytra strongly shortened; only 2nd line reaching to the anterior third; line 4 shorter; lines 1 and 3 present only in the posterior half. Head and pronotum with much sparser and more widely separated dots than the densely and finely punctate elytra *24. C.flaviventris (Motsch.). Mat females Elytra uniformly dull reddish, without distinct lines. Epipleura Wi Gens egdots pt atl ohie оо ий *1. С. polonicus (Aubé). Elytra with black longitudinal lines which are sometimes fused in some places. Lateral margin of elytra-rising toward the shoulder in a sloping line. Base of pronotum broadly black in the middle; disc without black spot. Dots in anterior half of elytra distinctly coarser and denser . ь ео *2. C.impressopunctatus (Schall.). Dots in anterior half of elytra markedly smaller (but still coarser than in C.parallelogrammus) and situated less closely BOGS UTS нь со 3. C.chinensis Sharp. Base of pronotum not black; disc with or without a spot. Larger (4.5—5mm). Head large. Body less oblong. Elytra more distinctly and densely punctate. Pronotum slightly narrower anteriorly, иене а ки И ИИ %5. С. parallelogrammus (Ahr.); *6. C.armeniacus Zaitz. Body more oblong. Punctation of elytra finer. Pronotum very MANGO Watt Tal O Tl yo еае *13. C.mongolicus Jak. Smaller (3.5—4 mm). Pronotum very narrow anteriorly; its lateral margins more strongly rounded. Body oblong, narrow. Spot оп pronotum always distinct ...... О IR RN A A *12. C.novemlineatus (Steph.). Body oval, broad. Spot on pronotum not sharp, sometimes indistinct SU Ra ic MUM tec MOR aa бе *9, C.corpulentus (Schaum). Pronotum slightly tapering anteriorly; its sides not rounded as in C.parallelogrammus. Four lines оп the elytra, 1st line very short not Meaching оне antervo rnawe 22) cise еее О И И #16. C.uzbekorum Zaitsev, зр. п. Lateral margin of elytra steeply rising to the shoulder, forming a distinct shoulder angle. In addition to the dense and fine punctation, elytra also with scattered dots, mainly near the scutellum. Body broader. Fourth black line usually interrupted, its posterior part broadened into a spot which is fused with the 3rd line .. #17. C.nigrolineatus (Stev.). Punctation of elytra fine, uniform; coarser, scattered dots absent; black lines always separate. Body narrower ............. Fecal St catenin iad byaine tian thee we Tai *22. С. enneagrammus (Ahr.). 139 134 Key to the Larvae of Coelambus Thoms. 1 (4). Legs without natatorial setae. Cerci short, with only 7 setae. (G)pmibightspotsiontheadiand)pronotum О Бо оваьобозовозоо С а с К о *2. C.impressopunctatus Schaum. 3h Ро MishiispOtsmincistinctmitt) sar mae %5. С. parallelogrammus (Ahr.). 4 (1). Legs (except femora) with natatorial setae. Cerci long, with numerous setae. 5 (6). Last abdominal tergite longer than penultimate; 2nd segment of @Sicet Wille 7 Cine! SOUAS Е We EMG 6546 86 6 *18. C.confluens Fabr. 6 (5). Last tergite shorter than penultimate. Second segment of cerci without a pair of setae at the end ...*22. C.enneagrammus (Ahr.). *1. Coelambus polonicus (Aubé) Nabe: 1842, Nnn, Soc. Ent. Ее. 2230) (Hay dir op ormuls) sj Яанзем, 1910:26; Zimmermann, 1930:65.— unguicularis Sahlberg, 1860, Sv. Vet. Ak. Handl., 17:47. Oval, strongly convex, reddish yellow; abdomen of female yellow, black in the male, except the anal sternite and spots at the sides of the first sternite; elytra slightly dark; pronotum with a narrow brown border at the anterior margin. Head shagreened, with a distinct depression anteriorly; also with distinct, delicate and scattered punctation which is more marked on the vertex; clypeus with straight anterior margin. Pronotum narrower than elytra, slightly tapering anteriorly, rounded with fine, dense, not quite uniformly distributed dots; a brown punctate small spot in the middle. Basal half of elytra finely and weakly punctate, more densely and more strongly punctate in the posterior half, and more weakly punctate laterally. Epipleura with dense and fine dots; hind coxae and first two abdominal sternites shagreened and with coarse, sparse dots. Male. Shining; first two segments of fore and hind tarsi strongly broadened; 3rd segment half as wide as the 2nd; 4th segment of fore tarsi thick, slender in the mid tarsi, twice as long as the third segment. Fore claws longer than the pretarsus; inner claw shorter than outer. Female. Shining and punctate like the male, or mat with uniform, fine punctation on the elytra. Length 4—4.3 mm. Distribution. European USSR and Caucasus (from the extreme north to Talysh), northern Siberia. Poland. Rare. *2. Coelambus impressopunctatus (Schall.). Schaller, 1783, Abh. Nat. Ges. Halle,1:312 (Dytiscus); Ganglbauer, 1892:453; Zimmermann, 1930:66; Csiki, 1946:598; Guignot, 1947:71.— lineellus Gyllenhal, 1808, Ins. Suec., [:529. Oblong oval, with slightly rounded sides; convex, rust red; vertex with a square spot near the eyes; middle of posterior margin of pronotum dark; elytra with 4 or 5 indistinct longitudinal lines which usually reach to the base; only the first line is slightly shortened anteriorly; 4th line interrupted 140 135 in the middle, 5th reduced to a short oblong spot; lines sometimes broad and more or less fused, almost forming a background. Head shagreened anteriorly, with thin, scattered dots; its posterior half not shagreened and with slightly denser dots. Pronotum with thin, scattered dots which are coarser, irregular and denser near the base. Posterior half of elytra with strong, dense, equal dots; dots very coarse in the anterior half, deep, almost like pockmarks, but sparse, interspersed with isolated fine dots. The normal 2 rows of dots on each elytron are strongly incised in the anterior half, with dense dots indistinct in the posterior half. Hind coxae, abdomen and epipleura with coarse dots. Length 3.75-5mm. Male. Shining. Inner claw of fore tarsi thicker, more curved and shorter than the outer. Penis not strongly curved, pointed. Female. Resembling the male or mat, slightly shining near apex of elytra, with finer, dense, uniform punctation and with weakly marked or absent rows of dots on the elytra (ab. lineellus Gyll.). The species varies in form of the body, in size, and in the sculpture on the elytra; it has the tendency to form local forms. Thus, specimens from the Crimea and Transcaucasia are usually markedly smaller than those from the European USSR, but the sides have the same rounded form; speci- mens from Eastern Siberia and the Far East are even smaller and narrower, and the sides are less rounded. Larva. Dark olive-green, yellowish red in some places; spots on head and pronotum distinct. Spinules on temples of different size. Appendages light, dark apically. Legs without natatorial setae. Distribution. Whole European USSR, Transcaucasia, Siberia, Far East, Turkmenia, Kazakhstan, Pamir. Europe, Asia Minor, northwestern Mongolia, Sinkiang (Sa Chou [Tunhuang]), North America. Very common, rare in the south. Ecology. It occurs in cool, fresh or brackish water. 2a. Coelambus impressopunctatus roborovskii Zaitsev, subsp. nov. Smaller than the eastern Siberian form (3.6—3.8 mm), very narrow, almost pointed posteriorly; dots in anterior half of elytra sparser than in the typical form, simple and markedly less coarse. Distribution. Sinkiang: Ulan Bulak, between Humboldt Range [Wu-Lan-ta pan Shen] and Nan Shan [Kansu-tsing Hai] (8 June 1894, Roborovskii and Kozlov, 4 specimens). 3. Coelambus chinensis Sharp. Sharp, 1880—1882:398; Régimbart, 1899:200; Zimmermann, 1930:68; ab. Opacus Falkenstrom, 1932, Entom. Tidskr., 53:192; idem, 1933, Ark. zool., 27 A, 1:10 (female). Closely related to C.impressopunctatus, but certainly a valid Species and not a race of C.impressopunctatus, as Falkenstrom 141 SIG assumed; it occurs together with C.impressopunctatus. One ofa large number of specimens from Sinkiang: [Tunhuang] Oasis, 3—8 April 1894, Roborovskii and Kozlov) belonged to C.impressopunctatus (with shagreened venter and characteristic punctation of the elytra) and resembled the East Siberian specimens; all other specimens (about 20) were C.chinensis; the series did not contain any transitional forms. Coloration as in C.impressopunctatus,i.e., head more or less black posteriorly; elytra with 4 or 5 black lines which vary as in C.impressopunctatus. Head delicately shagreened; vertex and pronotum not shagreened, with fine, scattered dots; elytra with fine dots which are dense posteriorly; anterior half with slightly larger dots which are sparse, interspersed with a few fine dots; both punctate grooves marked only in the anterior half and slightly impressed. Venter black; metathorax, hind coxae, epipleura, and abdomen with coarse dots which are less coarse thanin C.impressopunctatus. Male. Shining; venter not shagreened, as shining as the dorsum; there are sometimes traces of delicate shagreening in some specimens. Females shining like the males, or mat (C.opacus); they are intermediate in the punctation of the elytra between mat females of C.impressopunctatus and C.parallellogrammus. Length 4—5 mm. Distribution. China: Chekiang, Szechwan (Sharp, Régimbart), Inner Mongolia (Falkenstroém), Sinkiang (eastern part, between Humboldt Range and Nan Shan (a large series)). *4. Coelambus vittatus Sharp. Sharp, 1884, Trans. Entom. Soc. London:441; Reégimbart, 1899:201. This species belongs to the group of C.impressopunctatus, but differs from it more distinctly than C.chinensis; it differs from these two species in the pattern of the elytra. Coloration of body and the darkening of head as in C.chinensis; in addition to the dark areas of the anterior and posterior margin of the pronotum, pronotum usually also with a large, diffuse spot in the middle before the scutellum; black lines in anterior half of the elytra, separate but indistinct, 5 or 6 in number; black lines more or less fused behind the middle, often forming a diffuse spot. Head not shagreened, with fine sparse dots anteriorly and with stronger and denser dots posteriorly. Punctation of elytra markedly finer than in C.impresso- punctatus, uniform and dense in the posterior half; dots sparse in the anterior half, but not as sparse as in C.chinensis and interspersed with fine isolated dots. Venter black, shining in both sexes (mat females have not been found so far) and not shagreened; dots on sides of metathorax and abdomen smaller thanin C.impressopunctatus. Length 4.5—5 mm. Distribution. USSR: Maritime Territory (a large series from various localities). Northeast China (Manchuria), Japan. *5. Coelambus parallelogrammus (Ahr.). Ahrens, 1812, М. Schr. Nat. Ges. Halle, II (2):11 (Dytiscus); Gangl- bauer, 1892:452; Zimmermann, 1930:68; Gschwendtner, 1935, Rec. Ind. Mus., 142 137 хххХмиН 368 Ск 1946:529; Guignot, 194 7:72 = Темае аб. ие о - neatus Кипге, 1818, М. Schr. Nat. Ges. Halle, II(4):61 (поп Stev. 1808); Guignot, 1947:72. Oval-oblong, rust red; venter black; the following areas narrowly dark: posterior part of head, anterior and posterior margin of pronotum; the following areas black: a small rounded spot on disc of pronotum (some- times indistinct), suture and 5 lines on the elytra; line 2 and sometimes also line 4 reach the base; line 4 usually interrupted in the middle; line 5 divided into parts; its last part connected with the sutural line at the apex; antennae red, dark in the apical half. Pronotum slightly narrower anteriorly; disc with fine dots; dots large and slightly rugose near the anterior margin and at the base. Elytra also with dense, double punctation in the anterior half: the coarse dots mixed with a few fine dots; rows of dots weakly marked; only two rows of dots on the disc; sutural and lateral rows almost absent. Venter shagreened, mat. Epipleura and abdomen with dense dots. Inner claw of fore tarsi of male broad and more strongly curved than the outer, bluntly pointed. Females dimorphous: either shining dorsally like the male, or rarely mat (C.nigrolineatus Kunze); the species differs from the mat form of C.impressopunctatus in the presence of a black spot on the disc of the pronotum and in the finer and denser punctation of the elytra. Length 4.5—5.25 mm. Distribution. Steppe belt of the European USSR, to the Tatar ASSR and the Saratov Region in the north, Transcaucasia (Talysh), steppes of Western Siberia and Middle Asia to Transbaikalia. Central and southern Europe; ?Himalayas. Ecology. It occurs in fresh and brackish water. Common. *§. Coelambus armeniacus Zaitz. Zaitsev, 1927, Raboty Severo-kavkazskoi gidrobiologicheskoi stantsii, ть. This species differs from C.parallelogrammus аз follows: slightly smaller; body distinctly broader in the middle, distinctly black behind the head; punctation in anterior half of elytra stronger and sparser; lines on elytra broader, reaching to the base of the elytra, rarely fused. This species differs from C.lernaeus in the form of the body and in the different pattern on the elytra, etc. The mat form occurs together with the shining form. Length 4.5—5 mm. Distribution. USSR: mountain-forests of Transcaucasia. North- eastern Turkey. *7. Coelambus lernaeus (Schaum.). Schaum, 1857, Berl. Entom. Zeitschr., 1:153 (Hydroporus); Régimbart, 1895:38; Apfelbeck, 1904, Kaferf. Balkanhalb., 1:366; Zimmermann, 1930:69.— (?) var. orthogrammus Sharp, 1880—1882:405. 143 138 Closely related to the two preceding species, but differing from them as follows: smaller size; sides less rounded, almost parallel; pattern and especially punctation of elytra different: fine dots less numerous in basal third of elytra and coarse dots among them very sparse. Black lines 1 and 3 (often also line 2) markedly shortened anteriorly; line 4 markedly broader and contiguous with line 3 in the anterior and posterior half. Spot on disc of pronotum usually large, distinct. Fore tarsi of male less broad. Para- meres narrower, broadly rounded anteriorly; penis less curved, prolonged into a long point at the end. Length 4—4.5 mm. Distribution. USSR: Crimea, Ciscaucasia, eastern Transcaucasia. Middle Asia. Mediterranean Region, to Syria, Iraq and Iran in the east. This species is rarer than С. рага11е 1обга п тив. *8, Coelambus semenovi Jak. Yakovlev, 1898, Trudy Russkogo Entomologicheskogo obshchestva, XXXII:504.— distinctus Feng, 1936, Peking nat. hist. Bull., 11:7 (after Gschwendtner, 1939:9). Also closely related to C.parallelogrammus, but resembling C.armeniacus more closely in the more rounded sides. It differs from both the above species as follows: head smaller; body shorter; size smaller; sheen of dorsum weaker; pronotum narrower anteriorly; punctation uniform on the whole elytra, markedly stronger and sparser than in the anterior halfin C.parallelogrammus. Median dark spot on disc of pronotum small, indistinct or absent. Lines of dots on the elytra absent. Length 4.5—5 mm. Distribution. USSR: Maritime Territory. China (Kansu-Yakovlev; Peking — Gschwendtner). *9. Coelambus corpulentus (Schaum). Schaum, 1864, Berl. Entom. Zeitschr., VIII:109 (Hyd roporus); Apfel- beck, 1904, Kaferf. Balkanhalb., 1:365; Zaitsev, 1908, Ezhegodnik Zoolo- gicheskogo muzeya Akademii Nauk, VIII:3; Zimmermann, 1930:70.— leon- hardi Scholz, 1916, Entom. Mitt., V:168. Oval, broad behind the middle, convex, strongly shining or mat (female), yellowish red; vertex and spots near eyes more or less dark; disc of pro- notum with a small rounded spot which is more or less distinct, some- times indistinct; the following areas on the elytra black: suture; 3 not interrupted lines; line 4 interrupted in the middle; line 5 narrower and shorter, sometimes almost absent; a short dash near the lateral margin, behind the middle; lines 1 and 3 shortened anteriorly; lines 2 and 4 reaching closer to the base. Punctation of pronotum delicate, especially on the disc; dots in anterior half of elytra fine, sparse, inter- spersed with a few slightly larger dots; fine dots denser in the posterior half. Rows of dots on the elytra little prominent, and only in the anterior 144 139 half. Venter shining, not shagreened in both sexes. Dorsum shining in both sexes, or mat in the female. Claws of fore tarsi of male almost equal. Length 4,2—4.7 mm. Distribution. Steppe of the European USSR, and Middle Asia. ?Yugoslavia. Rare. *10. Coelambus saginatus (Schaum). Schaum, 1857, Berl. Entom. Zeitschr., 1:154; idem, 1859, idem, III:t.3, f.2 (Hydroporus); Seidlitz, 1887, Verh. nat. Ver. Brtinn, XXV:40; Scholz, 1916, Entom. Mitt., V:166; Zimmermann, 1930:70.— corpulentus Muller, 1900, Verh. zool.-bot. Ges. Wien, L:115. Closely related to C.corpulentus; it differs from it as follows: body more convex, slightly larger; sheen on dorsum weaker; ventral surface shagreened in both sexes; punctation of pronotum more distinct, coarse and dense on the elytra, consisting of large dots of different size inter- spersed with a few fine dots; punctation less dense in the anterior half than in the posterior half. Venter of both sexes shagreened. Fore claws of male different: inner claw shorter, thicker than the outer, and strongly curved. In the female, posterior half of elytra (rarely, whole elytra) delicately shagreened. Length 4.5—5 mm. Distribution. USSR: Kazakhstan (Dzhulek, Glazunov, а large series). Eastern Mediterranean. *11. Coelambus urgensis Jak. Yakovlev, 1898, Trudy Russkogo Entomologicheskogo obshchestva, XXXII:507; Zimmermann, 1930:71. Closely related to C.corpulentus, but slightly larger; head more distinctly punctate and shagreened; sides of body markedly more rounded; body broader; punctation of elytra intermediate between that of C.cor- pulentus and C.saginatus; all dots of almost the same size, denser than in C.corpulentus. Antennae longer, black in the apical half; antennal segments 2—5 of equal length. Fore tarsi of male less broad; inner fore claw slightly longer and less curved. First two abdominal sternites with coarse, sparse dots. Black lines on elytra distinct, of the same type as in C.corpulentus, but first 4 lines reaching closer to the base; line 4 often fused with line 5 behind the middle. Length 4.5—4.8 mm. Distribution. USSR: Transbaikalia. Mongolia. *12. Coelambus novemlineatus (Steph.). Stephens, 1828, Ill. Brit. Ent., Mand., II, 1828:192 (Hy droporu 5): Ganglbauer, 1892:452; Zimmermann, 1930:72. Oblong-oval; yellowish red; venter, apex of last antennal segments, and last two tarsal segments dark; spot near the eyes (sometimes indistinct), 145 140 rounded spot on disc of pronotum, sometimes also a narrow stripe at anterior margin of pronotum, suture, and 4 narrow longitudinal lines on the elytra black; the lines reach or almost reach the base; they are often fused posteriorly; line 4 sometimes interrupted in the middle; there is some- times also a rudimentary 5th line. Pronotum strongly narrowed anteriorly, with slightly rounded anterior angles; disc with fine dots; sides with coarser dots. Elytra with dense, uniform dots which are slightly finer in the female; rows of dots hardly marked in males, absent in females. Venter shagreened. Outer fore claw of male straight, as long as the last tarsal segment; inner claw shorter and curved. Male shining dorsally; female mat, shagreened, rarely shining like the male. Length 3.5—4 mm. Distribution. Extreme north of the European USSR, Western Siberia. Northern Europe, to northern Germany in the south, Denmark, Belgium. *13. Coelambus mongolicus Jak. Yakovlev, 1899, Trudy Russkogo Entomologicheskogo obshchestva, XXXII:506; Zaitsev, 1910:27; Zimmermann, 1930:73. Closely resembling C.parallelogrammus, but more oblong; anterior half of pronotum strongly narrowed anteriorly; lateral margin of pronotum distinctly rounded; lateral rim thinner; spot on disc usually larger and more distinct; posterior angles obtuse; elytra longer; their lateral margin more steeply rising anteriorly; usually less shining, dots uniform on the whole elytra and very dense; black lines reaching closer to the base; lines 2 and 4 often reaching to the base; last antennal segments completely black; tarsal segments also distinctly dark dorsally; inner claw of fore tarsi of male even shorter and broader than in C.parallelo- grammus. All females ша large series were mat; they are smaller than the males and resemble the mat form of C.parallelogrammus even more closely; however, the differences in the form of the pronotum show that they are C.mongolicus. They are more closely related to C.novemlineatus in that the lateral margin of the elytra is more steeply raised and the punctation uniform; however, the species differs in its much larger size, in the pronotum which is strongly narrowed anteriorly, and in other characters. Length 4.7—6 mm. Distribution. Eastern Siberia from Kolyma and Yakutsk to Trans- baikalia and the mountains of Mongolia. *14. Coelambus marklini (Gyll.). Gyllenhal, 1813, Ins. Suec., Ш:688 (Hydroporus); Ganglbauer, 1892:453; Zimmermann, 1930:73; Guignot, 1947:23.— mixtus Mochul'skii, 1860, Bull. Ac. Pétersb. П:515; ab. pallens Aubé, 1836, Icon. Col., V:368; Csiki, 1948:599.— avajevi Yakovlev, Trudy Russkogo Entomolo- gicheskogo obshchestva, XXX1:508 (sec. typ.). Oblcng-oval; moderately convex, shining, yellowish brown; venter black; epipleura, legs, and antennae reddish brown; last antennal segments dark apically; posterior part of head dark; a narrow part at anterior margin of 146 141 pronotum dark; base of pronotum dark in a more or less broad area, the dark area reduced and sometimes represented only by a small dark spot in the middle of the disc in light specimens; elytra with a black suture anda blackish brown spot with diffuse outer outline; this spot is sometimes divided into spots or stripes; itis rarely absent and only the dark area on the suture is present; the background color is lighter in this case, brownish yellow (ab. pallens). A more or less distinct depression on the head, near the eyes. Punctation of elytra strong, uniform, dense, slightly sparser near the base. Rows of dots of elytra (one near the suture and 2 on the disc) weak, marked only in the anterior half. Length 2.3—3.7mm. Male. First two segments of the fore and mid tarsi slightly broadened; inner claw of fore tarsi slightly thickened and curved; greater part of head smooth. Female. Greater part of head with a fine network. Distribution. European USSR, especially in the steppe, Transcaucasia, Siberia to Transbaikalia. Northern Europe and highlands of Central Europe, Mongolia, North and Northeast China. 15. Coelambus inscriptus Sharp. Sharp, 1880—1882:404; Zimmermann, 1930:74. Oblong oval; shining, reddish yellow; venter black; the following areas on the elytra black: sutural stripe; longitudinal stripe near it, which does not reach to the base or the apex and is slightly broader posteriorly; two spots lateral to this stripe. Elytra with dense, strong dots. Fore tarsi of male strongly broadened; inner claw short and thick. Length 3.5mm (described from 2 males; this species is not well known). Distribution. Iran, Iraq. *16. Coelambus uzbekorum Zaitzev, зр. п. Female. Thespecies belongs tothe groupof C.impressopunctatus, 1.е., to the species in which the lateral margin of the elytra rises to the shoulder in a steep line; because of the reduction of the black lines, this species resembles C.inscriptus from Iran. This will have to be decided when further material, especially males, becomes known. Body narrow, sides slightly rounded. Pronotum slightly narrower anteriorly (as in C.impressopunctatus); lateral margin of pronotum also rounded. Coloration of dorsum, antennae, and legs straw yellow, slightly reddish; only apex of last antennal segment and a narrow area in middle of base of pronotum black; black longitudinal lines markedly reduced: first line present only in the posterior half; line 2 longer, interrupted in the anterior third; line 3 as long as line 2, but broadly interrupted in the middle (line 4 usually interrupted in species of this group); line 4 complete, broader in the middle; lines 2—3 broader at the posterior end and contiguous. Venter black. Dorsum shagreened, mat, without coarse, scattered dots. Venter delicately shagreened; hind coxae and sides of first abdominal sternites with small, sparse dots. Length 4mm. Distribution. Uzbekistan: Khaairova, near Khiva (5 August 1924, Tratnikov, 1 female). 147 *17, Coelambus nigrolineatus (Stev.). Steven, 1808, in: Schonherr, Syn. Ins., 11:33 (Dytiscus); idem, 1829, Mus. Hist. nat. Univ. Mosqu. :27, nota 45; Zaitsev, 1908, Ezhegodnik Zoologicheskogo muzeya Akademii Nauk, XIII:3; idem, 1908, Russkoe Entomologicheskoe obozrenie, VIII:62; idem, 1909, idem, IX:468.— lautus Schaum, 1843, Germ. Zeitschr.,1V:187; Ganglbauer, 1892:451; Zimmer- mann, 1930:75; Csiki, 1946:601. Broadly oval, uniformly tapering anteriorly and posteriorly, reddish yellow; pronotum and epipleura black; the following areas black: posterior part of head, region near eyes, a rounded spot on the disc, suture and 4 stripes on the elytra; the stripes do not reach the base of the elytra and are fused at the end intheposterior half; 4th stripe interrupted in the middle; its posterior part broader at the beginning and fused at this point with the 3rd stripe, forming a spot. Head shagreened, with fine, dense dots; pro- notum also punctate, narrower anteriorly, with slightly rounded lateral margin. Elytra broader than pronotum, with dense, fine punctation and also with coarser dots on the black stripes which form irregular rows. Venter shagreened. Fore and mid tarsi of male strongly broadened, inner claw of fore tarsi long, straight, curved only at the apex, outer claw half as long as inner, thicker and more strongly curved. Dorsum of female shagreened, mat. Length 3.5—4 mm. Distribution. Steppe of the European USSR, ?Yaroslavl Region (Yakovlev). Central Germany, Poland, Austria (Vienna); northwestern Mongolia: Lake Buyr Naur (Potanin, 1 specimen). Ecology. Rare, in brackish water. *18. Coelambus confluens (Fabr.). Fabricius, 1787, Mant. Ins. 1:193 (Dytiscu $); Ganglbauer, 1892:451; Guignot, 1947:74; Zimmermann, 1930:76; Csiki, 1946:601. Short oval, strongly convex, reddish yellow; elytra slightly paler than head and pronotum; head dark posteriorly and near the eyes; base of pro- notum also slightly dark; the following areas on the elytra dark: suture and 4 narrow longitudinal lines which are distinct only in the posterior half of the elytra; line 4 reduced toa short dash; this line is sometimes prolonged and reaches the anterior third of the elytra. Elytra with fine and dense dots; inner half of elytra in the region of the scutellum with coarse pock- marklike dots which form irregular longitudinal rows in some places; sutural angle projecting posteriorly in a weak denticle. Hind coxae and first 2 abdominal sternites with coarse, dense dots. Fore and mid tarsi of male slightly broadened. Length 2.8—3.5 mm. Distribution. Steppe zone of the European USSR, Transcaucasia, Turkmenia, Uzbekistan. Central and southern Europe, Mediterranean, Iran, Kashmir. 148 142 *19. Coelambus pallidulus (Aubé) Aubé, 1850, Ann. Soc. Ent. Fr. (2) VIII:300 (Hydroporus); Régimbart, 1895:32; Apfelbeck, 1904, Kaferf. Balkanhalb., [:366; Zimmermann, 1930:77; Guignot, 1947:75. This species differs from C.confluens in the oval form of the body, the head which is not dark but of the same color as the body, the absence of coarse dots on the elytra; 3 or 4 coarser dots sometimes present in the region of the scutellum. Reddish yellow; elytra paler; black color of dorsum restricted to 4 narrow lines which are very short and reach only to the posterior half of the elytra; line 2 slightly displaced anteriorly and reaching slightly beyond the middle; venter of male black (except anal sternite); abdomen of female yellow. Head and pronotum with small dots which are sparser than on the elytra. Body oval, more oblong and flattened than in C.confluens. First longitudinal row of dots (on the 2nd black line) distinct; venter more strongly punctate than in C.caspius but less сваю С сон flu eins?) еп 53.25 —3'.75 mim: Distribution. USSR: Shore of Black Sea, Caspian Sea, eastern Georgia. Mediterranean, especially near the sea shore; the species does not occur far inland and is rare and sporadically distributed. Iran: Lake Urmia. *20. Coelambus caspius (Wehncke). Wehncke, 1873, Berl. Entom. Zeitschr., XVII:234 (Hyd roporus); Seidlitz, 1887, Verh. nat. Ver. Brinn, XXV:43; Zimmermann, 1930:76. The species differs from C.confluens as follows: sides of body less rounded; head darker; punctation on head denser and stronger; antennae thicker; it differs from C.confluens especially in the absence of coarse scattered dots in the anterior half of the elytra, which are less tapering posteriorly, and in the weaker punctation on hind coxae and abdomen. Black lines on elytra narrow, usually divided into parts; only line 2 extends some- times to the anterior half. Length 3.2—3.5 mm. Distribution. Steppe zone of the European USSR, Kazakhstan, Turkmenia. *21. Coelambus reitteri Zaitz. Zaitzev, 1907, Russkoe Entomologicheskoe obozrenie, VII:268. Closely related to C.caspius, differing from it in the slightly more rounded sides and in the constant development of black lines on the elytra: all the lines are broad, reaching far into the anterior half of the elytra; line 4 broadly interrupted in the middle; ends of the lines markedly broadened in the posterior half; lines 2,3 or all 4 lines usually fused. Fine punctation on the elytra less delicate and markedly sparser; dots in the presutural row and the first row of dots markedly enlarged in the region 149 of the scutellum; they spread to the interval between the suture and the first row of dots; they sometimes reach to the middle of the suture; however, all dots less coarse and less numerous than in C.confluens. Hind coxae, sides of first two sternites and anal sternite with stronger dots than in C.caspius. Length 3.5—4 mm. Distribution. USSR: Transbaikalia. Northern Mongolia, China (Kansu). 143 *22. Coelambus enneagrammus (Ahr.). Ahrens, 1833, Isis:645 (Hydroporus); Ganglbauer, 1892:422; Zimmermann, 1930:77; Csiki, 1946:600.— tauricus Mochul'skii, 1859, Bull. Ac. Se. Pétersb., [:303. — puncticeps Seidlitz, 1887, Verh. nat. Ver. Briinn, XXV:43. Ovoid, oblong; dorsum straw yellow; suture and 4 or 5 broad, distinct lines (stripes) on elytra black; lines reaching almost to the base; line 2 slightly curved inward at the end, fused with the black oblique lateral dash which is often absent; line 5 usually weakly marked or absent, rarely well developed (var. puncticeps Seidl.). Dorsum with delicate, dense and fine punctation, shining in the male, delicately shagreened, mat in the female. Venter shagreened, without dots, black in both sexes; sides of first 4 abdominal sternites and apex of anal sternite rarely yellow in the female. Elytra with three rows of dots; 1st row presutural, 2nd row situated on the second black stripe and the 3rd row on the fourth stripe. Head densely and finely punctate, without coarse scattered dots. Length 3—4 mm. Distribution. Steppes of the European USSR, western Kazakhstan, Middle Asia, eastern Transcaucasia. Germany, Austria, Rumania, Iran, Baluchistan. It occurs mainly in brackish water; common. *23. Coelambus pectoralis (Motsch.). Mochul'skii, 1859, Bull. Ac. Sc. Pétersb.,1:303 (Hydroporus); Zimmermann, 1930-78. Closely related to C.enneagrammus, differing from it in its greater size and in the more convex and more broadly oval body. Head with delicate, fine punctation and scattered, coarse dots; hind coxae and first 3 abdominal sternites finely but distinctly punctate. Abdomen of female yellow; dorsum delicately shagreened, less mat thanin C.enneagrammus. Length 4—4.5 mm. Distribution. Steppes of the southeast of the European USSR and Western Siberia, Turkmenia. Rare. *24. Coelambus flaviventris (Motsch.), Mochul'skii, 1859, Bull. Ac. Sc. Pétersb., 1:303 (Hydroporus); Seidlitz, 1887, Verh. Nat. Ver. Brinn, XXV:43; Zimmermann, 1930:77. 150 144 Dorsum straw yellow, slightly reddish, shining; venter of male black, of female yellow, slightly dark on metathorax and hind coxae. Suture and 4 lines on the elytra black; lines 1 and 3 reaching only slightly beyond the middle anteriorly; lines 2 and 4 longer, reaching tothe anterior third of the elytra; line 4 interrupted in the middle. Head with distinct, dense dots; pronotum with finer and sparser dots; elytra with very delicate and dense punctation, with two rows of dots: one presutural and one on the 2nd black line. This species differs from C.enneagrammus in the absence of punctation on hind coxae and abdomen, and also in the very delicate, fine punctation of the elytra. Length 3.5—4 mm. Distribution. Steppes of the European USSR and Western Siberia Kazakhstan, Middle Asia. Mongolia, China (Sinkiang, Manchuria). Another species of Coelambus was described from China. However, the original description states that the clypeus has a distinct thin rim at the anterior margin and it is therefore unlikely that it belongs to the genus Coelambus. This species probably belongs to the genus Hygrotus, although the pattern on the elytra resembles that of species of Coelam - bus. We give the description of this species below. 25. Coelambus trilineatus Feng. Feng, 1936, Peking nat. hist. Bull., П:6; Gschwendtner, 1939:10. Oblong-oval; pronotum tapering anteriorly in a curve; lateral rim thin. Clypeus with а thin rim. Head, pronotum and elytra with coarse, simple dots; dots coarser on vertex and near margin of pronotum; venter with similar coarse dots, except middle of metathorax, where they are finer. Dorsum yellow; head with a broad, black, transverse spot between the eyes which broadens anteriorly at the inner margin; sutural stripe, the 3 longitudinal stripes which are shortened anteriorly and posteriorly, and the 2 or 3 oblong spots near the lateral margin black; inner stripe often fused posteriorly with the 2nd, 3rd stripe usually anteriorly contiguous with the broad lateral spot; 1 or 2 spots near the base also black. Venter blackish brown, legs yellow. First 3 segments of fore and mid tarsi of male moderately broadened. Length 3.7mm (after Gschwendtner). Distribution. North China (Shansi). 12. Genus Hydroporus Clairv. Clairville, 1806, Entom. Helvet., П:182; Ganglbauer, 1892:122 (part); Zimmermann, 1831:1; Guignot, 1947:78. Body oval or oblong, slightly convex. Clypeus without rim at the anterior margin. Last segment of palps usually without apical indentation, or with a slight indentation. Fourth antennal segment shorter than the adjacent segments; 3rd segment shorter than 2nd. Pronotum more or less narrowing anteriorly, without lateral rim. Elytra usually dark, punctate, and with three longitudinal rows of dots, which are sometimes weakly marked or 151 145 absent (especially the 3rd row, near the lateral margin). Process of pro- thorax always ending in a pointed or obtuse angle, never rounded. Processes of hind coxae more or less truncate or projecting in an angle; they have rarely a small indentation or incision in the middle; however, they are never deeply incised or project posteriorly in lobes. Epipleura without pit, narrow posteriorly. Male. Penis (Figure 46) slightly curved, flattened. Para- meres usually in form of a bird's wing, with strongly convex dorsum and concave ventral side. a b с FIGURE 46. Penis of species of Нудгорогиз:. а —H. palustris L.; Б —Н. vagopictus Fairm.; с — H. ja- ponicus Mill.; 4 -H.incognitus Sharp; е —H.striola Gyll. Larva. Body more or less cylindrical, broad, slightly flattened. Abdomen sclerotized only on the last two segments. Frontal horn slightly indented at the sides. Second antennal segment usually longer than third. Last segment of cerci longer than the last abdominal segment, but shorter than the last two segments together. Seven primary setae; basal seta separated from the following two. Pupa. Pronotum transverse, constricted posteriorly; abdomen markedly flattened. Cerci with spinules at the apical end and with setae: a lateral seta, a proximal seta, and an apical seta. The species live in calm water more or less overgrown with vegetation; rarely in open water in the steppe. A few species occur in the high mountains. This genus is exclusively Holarctic; it contains about 200 species, most of them in North America. This genus is divided into 5 subgenera which are indistinctly differentiated. Key to Subgenera 1 (2). Process of prothorax broad, slightly convex, without a groove at the lateral margin. Hind coxae mat. Body with a strong or moderate constriction between pronotum and elytra, so that the lateral line is interrupted at this point and forms a more or less marked angle. 152 Dey) 8) Я (3). Lateral line of elytra (in side view) distinctly curved upwards toward the shoulder angle) ....... 1. Subgenus Suphrodytes Goz. Process of prothorax narrow, with a groove near the lateral margin, laterally compressed and distinctly convex in its greater part. Hind coxae shining. Body without constriction between the pronotum and elytra (or with a little marked constriction); lateral line of elytra not rising to the shoulder. End of processes of hind coxae situated on a straight or almost straight line (Figure 44) ....... 2. Subgenus Hydroporus s. str. End of coxal processes forming an angle which projects ventrally ME PRU Re И ми ss 3. Subgenus Hydroporinus Guign. Key to Larvae of Hydroporus Schall. 1 2 (4). (3). Frontal horn very short, fp as long as head. Mandibles covered with a network. Length6mm ........... а, По ПС РИ .. №21. H.erythrocephalus L. Mandibles;smooth. | еп". аа, а понес PR SE EE Ee choy Е en eke *24, H.melanocephalus (Mrsh.). Frontal horn moderately long or long, longer than Ws of head. Process at end of body long. Pronotum uniformly dark, or with numerous light spots. Venter uniformly brownish black. Alps, Pyrenees .......... ИЕ, ОЗ ев, ПЗ MAN othe Natte H. foveolatus Heer. Venter grayish black or rust-colored, with light spots. Second segment of cerci shorter than lst segment; cerci only with primary setae, grayish with light spots. Light spots distinct. Antennae and palps slightly dark apically . . Be ek sce ante hail be, DEY aa RE oan penitent Па *14, H. palustris (L.). Light spots indistinct. Antennae and palps distinctly dark ариев * 33. Н. pubescens Gyll . Second segment of cerci as long as, or longer than lst segment. Clypeus uniformly yellowish gray...... 29. Н. marginatus Duft. Clypeus dark, marbled anteriorly. Frontal horn uniformly light. Abdominal tergites, like the thoracic tergites, gray, with a yellow spot......... *31. H. planus (Fabr.). Frontal horn black apically. Abdominal tergites of uniform color SOR NG EE О a ee Od ste LAER RN Е *44, H.nigrita (Fabr.). Abdominal process long, black; pronotum with 2 light spots о СЕ О uh о Но dorsalis! (rabrs)s 1. Subgenus Suphrodytes Goz. Des Gozis, 1914, Misc. Entom., XXI:110; Guignot, 1947:84. This subgenus contains only 5 species of Arctic origin; only a few of these species enter the temperate zone of the Palearctic Region. Type species: Dytiscus dorsalis F. 153 147 Key to Species 1 (4). Lateral margin of elytra rising to the shoulder angle in a distinct curve (in side view). Body with a distinct constriction between pronotum and elytra. 2 (3). Pronotum completely covered with dense dots; elytra of male with dense, strong dots; dots finer in the female. Transverse depression on pronotum distinct, reaching the posterior angles. Broader.... Бо, В a) Rho coy slic secu des Ce ae . *1. H.(S.) dorsalis (Fabr.). 3 (2). Pronotum almost without dots in the middle; elytra of male with fine, sparse dots; elytra of female sometimes strongly shagreened. Transverse depression of pronotum weak, sometimes hardly marked. Магомет ее .... 2. Н. (5.) lapponum (СУ1.). 4 (1). Lateral margin of elytra almost straight. Sides of pronotum not strongly converging anteriorly. 5 (8). Whole surface of pronotum and elytra uniformly covered with fine dots. Head red, dark on the vertex. 6 (7). Body narrow, slightly convex, shining in both sexes; sides of body slightly rounded. Lateral margin of pronotum markedly rounded В DIM oly ds cucu eheuswed ee omens *3, H.(S.) arcticus Thoms. 7 (6). Body markedly broader, blunter at the end; dorsum of male weakly shining, that of female mat. Sides of body markedly rounded. Lateral margin of pronotum straight, slightly rounded only near the POSteE riormanesde ce Зав. ео: *4, Н.(5.) tomentosus Popp. 8 (5). Pronotum markedly more strongly punctate laterally than in the middle. Elytra with coarse dots. Head and pronotum completely black, сни зай beach etrorackons *5. H.(S.) submuticus Thoms. *1. Hydroporus (Suphrodytes) dorsalis (Fabr.). Fabricius, 1787, Mant. Ins. 1:192 (Dytiscus); Ganglbauer, 1892:469; Zimmermann, 1931:4; Csiki, 1946:608; Guignot, 1947:80; ab. figuratus Gyllenhal, 16277, Ins. “Suec:, [/: 387, ab. tran sversalis №. Norre 1807. Jahresb. Nat. Ver. Oesterr.,8:61; ab. marginalis Schilsky, 1889, Deutsch. Entom. Zeitg.:346; ab. maeklini Zaitsev, 1910:29; sibiricus Maklin, 1881, Svensk. Vet. Ac. Handl., 18:22. Oblong-oval, convex in the anterior half, slightly flattened in the posterior half, with dense, long, adpressed hairs, brownish black; head red; vertex with a black spot of varying form; antennae and legs red; coloration of pronotum and elytra varying: in the typical form, pronotum blackish with a reddish yellow lateral stripe and with a transverse stripe which is interrupted in the middle; elytra with a reddish yellow stripe which is broad anteriorly and narrower posteriorly; disc of each elytron with a small rounded spot of the same color near the base, which is rarely slightly projecting posteriorly; elytra also with 1—3 small spots laterally, near the apex; ab. figuratus has a broad reddish yellow stripe at the sides of the pronotum; elytra completely rust-colored; blackish coloration present only along the suture and in a spot of varying size on the disc, behind the middle; the reddish spot 154 near the base of the elytra is absent in ab. marginalis; this spot is larger in ab. transversalis and fused with the lateral stripe; the elytra of ab. maeklini have the same coloration as in ab. figuratus, but the pronotum is either completely black or has a narrow lateral stripe. Head delicately shagreened and punctate, more weakly punctate anteriorly than posteriorly. Pronotum with rounded sides, transverse, without lateral rim, with a transverse depression at the base; this depression passes into a pit near the posterior angles; pronotum slightly flattened in the middle, as strongly punctate as the elytra, but less densely. Elytra broader at the base than the pronotum; the lateral margin rises tothe shoulder ina shallow curve. Venter brownish red, strongly shagreened, mat; abdomen with strong, dense dots. Process of prothorax completely granulate, broadened, posteriorly, convex, without a keel in the middle and without a lateral rim. Length 4.5—5.5mm. Dorsum of male with a weak sheen, smooth; only the head is shagreened; first three segments of fore tarsi distinctly broadened; claws long; inner claw is broadened and with a blunt denticle. Dorsum of female mat, completely covered with a delicate network or with dashes; dorsum finely punctate; depression on the pronotum less marked or interrupted in the middle. Distribution. Northern and central part of the European USSR, Siberia, Middle Asia. Europe, mainly northern and central Europe. The color variants ab. figuratus and ab. maeklini Zaitz. are apparently restricted to the Arctic zone of Eurasia (cold-loving forms). Ecology. It occurs in calm, shaded water, with rich vegetation and detritus. Common. *2. Hydroporus (Suphrodytes) lapponum (Gyl1.). Gyllenhal, 1808, Ins. suec., [:532 (Dyti secu 8) Zimmermann, 1931:5.— obtusipiennis; Sahlberg, 1873; Not. Sallsk. Fn. Fl. Fenn:, 14:146. — kolstr6mi Sahlberg, 1873, idem, :145. Closely related to H.dorsalis, but slightly narrower; dorsum of male markedly shagreened; dorsum of female similar or coarsely shagreened, mat; pronotum with less rounded sides, almost without dots in the middle; depression at the base hardly marked; elytra markedly narrower, weakly broadened in the posterior half; venter markedly less punctate. Pronotum with a narrow lateral reddish stripe; elytra without the typical shading of H.dorsalis, dark brown, rarely reddish brown (ab. kolstr6mi), with lighter sides. Fore claws of male simple, not broadened, without denticle. Length 5.5mm. Distribution. Marinorth of the UsoR.,” Arctic. zone of ihe Holarctic Region. Ecology. Shallow, stagnant water inthe tundra, overgrownwith Hypnum; ‘this species occurs rarely in the Subarctic forest zone. Common. 148 *3. Hydroporus (Suphrodytes) arcticus Thoms. Thomson, 1854, Svensk. Vet. Akad. Handl.:197; Zimmermann, 1931:19 (part).— fennicus Seidlitz, 1887, Verh. Nat. Ver. Briinn, 25:66. 155 Oval, slightly broader in the posterior half, convex; dorsum and venter shagreened, slightly shining, with dense yellowish hairs. Black; head, epipleura, process of prothorax and legs red; femora sometimes dark in the middle, often also abdomen reddish; antennae brown; first 2 or 3 antennal segments and base of other segments reddish yellow; dorsum brownish black; sides of elytra with a diffuse reddish stripe. Punctation of head fine, scattered, that of pronotum fine, uniform; punctation of elytra also fine but denser. Pronotum convex on the disc, with a weak transverse depression at the base; sides slightly rounded, with a thin rim, sides slightly flattened. Lateral margin of elytra almost straight. Process of prothorax broadly oval, with a blunt longitudinal keel in the middle, covered with hairs. Fore claws of male strongly curved at the base, with a blunt denticle. Length 4—5 mm. Distribution. Arctic zone of Holarctic Region. This species is distributed to the Yaroslavl and Novgorod regions in the south. Ecology. It occurs under similar conditions as H.lapponum, but penetrates farther into the forest zone; rare. This and the two following species are intermediate between the sub- genera Suphrodytes and Hydroporus s.str. in the form of the process of the prothorax. *4, H.(Suphrodytes) tomentosus Popp. Poppius, 1905, Oefvers. Finsk. Vet. Soc. Forh.,47:12.— arcticus var. tomentosus Zimmermann, 1931:19. Described from a single female; Zimmermann considers this species as a mat female of H.arcticus. However, the study of our series from Yakutia (Amga village, Yakutsk District, August 1925, Bianki, 12 specimens, males and females) proves that H.tomentosus isa valid species; it differs from H.arcticus as follows: body broad, slightly narrowing anteriorly and posteriorly, markedly more convex, with a weaker sheen on the dorsum; sides of elytra more rounded; the golden-yellow hairs denser. In the male, punctation and shagreening of the elytra delicate; body of female completely mat. Fore claws less broadened in the basal half, gradually tapering apically. Length 4.5—5 ти. Dwisitie7 buiiaon | Уакама. *5. H.(Suphrodytes) submuticus Thoms. Thomson, 1874, Opusc. Entom., 6:537; Zaitzev, 1907, Russkoe Entomolo- gicheskoe obozrenie, VII:119.— Zimmermann, 1931:20.— rubripes Sahl- berg, 1873, Not. Sallsk. Fn. Fl. Fenn., 14:151. Oblong-oval, sides slightly rounded, slightly convex; dorsum shining in both sexes, or dorsum of female mat, strongly shagreened. Black; antennae red at the base, then brownish black; legs red, head brown, elytra dark brown, sides lighter. Pronotum slightly tapering anteriorly, with rounded sides, with a thin but distinct lateral rim, almost smooth on the disc, with 5917 156 dense and rather coarse dots all around; а slight depression near the rounded posterior angles. Elytra with coarse, sparse dots; lateral margin 149 almost straight. Venter more strongly shagreened. Length 4.5mm. Distribution. USSR: Yaroslavl Region, Siberia, Transbaikalia, Far East, northern Sweden, Finland. 2. Subgenus Hydroporus s.str. Guignot, 1947:79; Zimmermann, 1931:1 (part). Шуе Species. Dytiscus *39. Gaurodytes (s. str.) paludosus (Fabr.). Fabricius, 1801, Syst. Eleuth., 1:266 (Dyt iscus); Zimmermann, 1934:34; Csiki, 1946:649; Guignot, 1947:185.— ?marginalis Sharp, 1880—1882:502. Oval, moderately convex, shining, black; clypeus, two spots on vertex and broad diffuse lateral border of pronotum reddish; elytra light-chestnut brown; base, sides and epipleura yellowish red; antennae, fore- and mid- legs brownish red (femora darker); hind legs brownish black. Sculpture of dorsum very delicate (slightly more distinct in the female), consisting of irregular polygonal cells which are slightly larger on head and pronotum. Row of dots at anterior margin of pronotum interrupted not only in the middle but also laterally. Prothoracic process Йа{-сопуех, not keeled; lateral wings of metathorax narrowly triangular. Fore claws of male simple. Heneth 6: 5—1. мата Distribution. European USSR to the Kiev and Ryazan region, Georgia (highlands); Siberia (Tomsk Region). Northern and Central Europe (rare in southern Europe), northeastern Turkey (Erzerum). Ecology. The species occurs in clean water, either running or stagnant. It may occur to an altitude of 2,000m in the mountains. *40. Gaurodytes (s. str.) uliginosus (L.). Linné, 1761, Fn. Suec., ed. П:216 (Dyt iscus); Zimmermann, 1934:34; Csiki, 1946:649; Guignot, 1947:182; female ab. dispar Bold, 1849, Zoolog., 7, App. :24. Short, ovoid, strongly convex, shining, pitch black; spots on the vertex and lateral border of pronotum reddish; antennae and legs rust-red;- elytra 257 243 pitch black to black; epipleura and sides (sometimes whole elytra) light, brownish red. Sculpture of dorsum delicate but more distinct than in G.paludosus, with scattered dots at the crossing of the loops of the net- work; the sculpture may vary; there are rarely females with mat, strongly shagreened elytra (ab. dispar Bold.); rows of dots on elytra strongly impressed. Pronotum with thick lateral rim and rounded sides, tapering anteriorly. Prothoracic process with a sharp keel; lateral wings of meta- thorax broadly triangular. Length 6.5-8mm. Fifth segment of fore and mid tarsi almost as long as the 3 preceding segments together. Inner fore claw of male much broader than the outer, with a broad short denticle in the middle. Distribution. European USSR: to the Kiev and Saratov regions in the south, Krasnoyarsk. Northern and Central Europe to northern Italy and Rumania (Transylvania). *41. Gaurodytes (s. str.) jacobsoni Zaitz. Zaitsev, 1905, Russkoe Entomologicheskoe obozrenie, V:225; idem, 1907, Ezhegodnik Zoologicheskogo muzeya, 11:98. Oblong, ovoid, strongly convex, shining, pitch black, with a weak bronze sheen; two spots on vertex, lateral border of pronotum, antennae and legs rust-red; lateral margin of elytra lighter than disc. Dorsum witha delicate network, which is more distinct on the pronotum, which has a thick lateral rim. Rows of dots оп the elytra not strongly marked. Prothoracic process convex, slightly keeled. Fore and mid tarsi of male moderately broadened; inner claw of the fore tarsi strongly broadened, with a large broad, blunt denticle in the middle. Length 8.5mm. Female unknown. Closely related to G.uliginosus (L.), but differing from it as follows: larger, more oblong; rows of dots on elytra weaker; prothoracic proccess with lower keel; claws of fore tarsi shorter; inner claw more strongly broadened, with a larger denticle. Distribution. The species was described from a single male from the vicinity of Leningrad; it is not present in any other collection. It probably occurs in the taiga and reached Leningrad from Siberia. This species has not been found in Finland (the aquatic Coleoptera have been well studied) so that the labeling of this specimen may be wrong. #42. Gaurodytes (s. str.) zaitzevi Popp. IPO Hovis) 1908. Асга вос. Ею Wile) нения. Sills 8 (?not Zimmermann, 1934:36). Moderately convex, uniformly yellowish brown, moderately shining (male) or slightly mat (female); the slightly darker elytra with a weak metallic sheen. Venter black; head, pronotum and posterior margin of abdominal sternites of the same color as the dorsal surface. Legs, antennae and palps yellowish red; last antennal segments black apically. Head large, with dense, small dots; pronotum slightly narrower at the base than elytra, 258 244 strongly narrowed, rounded anteriorly; anterior part almost half as wide as the base, with a thin lateral rim; fine punctation as on the head; row of dots at anterior margin not interrupted. Elytra with broadly rounded end, broadest behind the middle; their sculpture slightly stronger than on the pronotum; rows of dots present. Prothoracic process convex but not keeled. Lateral wings of metathorax as in G.congener. Resembling G.lapponicus, but differing in its light coloration, the broader body, less rounded, more flattened, shorter and broader elytra. Fore claws of male simple as in G.congener. Length 6.5mm (after Poppius). Distribution. North of European USSR (Kanin Peninsula). *43. Gaurodytes (s. str.) luteaster (Zaitz.). Zaitsev, 1906, Russkoe Entomologicheskoe obozrenie, VI:24 (Eriglenus); Gschwendtner, 1935:74.— ?zaitzevi Zimmermann, 1934:36. Narrowly oval, oblong, moderately convex, with a marked greasy sheen; elytra with a weak metallic iridescence which is reddish yellow to brownish; usually two oblique contiguous spots on the head near the eyes; pronotum of uniform color or with a slightly dark area on the disc; sides of elytra yellow; venter reddish brown; hind coxae and base of abdominal sternites (except first sternite) usually more or less dark; antennae and legs reddish yellow; last antennal segments (or only last segment) dark apically. Sculpture of dorsum delicate, with an irregular polygonal network; loops transverse in anterior half of the elytra; in the female, network often slightly more strongly incised; loops of network smaller and coarser in the posterior half in both sexes; elytra also with dots and small dots of varying size which are more or less densely scattered; usual rows of dots present, confused. Pronotum strongly tapering anteriorly; sides rounded; lateral rim moderately thick, markedly thinner anteriorly; posterior angles rectangular, slightly rounded. Elytra broadest behind the middle, then tapering, with a little marked indentation in the posterior third. Prothoracic process convex, Slightly keeled; lateral wings of metathorax narrow, almost as in Eriglenus labiatus. Last segment of fore tarsi of male almost as long as 3 preceding segments together; claws markedly different: inner claw twice as broad as the outer; broader at the apex; a broad sub- apical rectangular denticle. Surface of elytra sometimes slightly irregular, slightly tuberculate (as is commonly observed in Arctic species). Length 6—6.5 mm. Эту я ом. USSR: Arctic Siberia. Ecology. It occurs in small lakes overgrown with Sphagnum; also in the tundra; common. According to the narrow lateral wings ofthe metathorax, this species may have been placed in the genus Eriglenus; however, the male genitalia are of a different type from that of Eriglenus: parameres without terminal appendage (i.e.,as in species of Gaurodytes). 259 *44. Gaurodytes (5. str.) amnicola ба Ъ. J. За Бег, 1880, Sv. Vet. АК. Handl., 17:58; Zimmermann, 1934:36. Closely related to G.uliginosus (L.) in sculpture and form of the fore claws of male, but differing from it in the narrower, longer and less convex body and in coloration (?). It resembles G.haeffneri (= аа - pressus), more closely, but differs from it in the more convex body, the broader pronotum and the form of the claws. Male. Dorsum pitch black; epipleura of elytra pitch black with a bronze iridescence. Length 7.5mm (after Sahlberg). Distribution. Described from a single specimen from the lower reaches of the Yenisei (among Potamogeton at the bank of a small river). This species is apparently not identical with G.uliginosus and is more or less closely related to G.jacobsoni Zaitz., but a study of the original specimen would be necessary to determine its status. *45. Gaurodytes sturmi (Gyll.). Gyllenhal, 1808, Ins. Suec., 1:493 (Dytis cus); Zimmermann, 1934:58; Csiki, 1946:650; Guignot, 1947:181.— fallax Munster, 1932, Norsk. Ent. DRC Sie 5 1985). Broadly oval, slightly convex, slightly compressed posteriorly; dorsum almost mat; venter more shining. Black; spots on vertex, broad inwardly diffuse border of pronotum (sometimes absent — ab. fallax Miunst.), epipleura and posterior margin of abdominal sternites, red; antennae yellowish red; last antennal segments dark at the apex; legs reddish; femora darker; elytra light or dark brown; sides of elytra and sometimes also the area at the base brownish yellow. Dorsum strongly shagreened; network coarse, withirregular polygonal cells; rows of dots irregular, weak; dots smaller than cells of network. Venter less shagreened; abdominal sternites densely covered with thin, longitudinal dashes. Pro- thoracic process lanceolate, flat-convex, pointed, with a thin lateral rim. Lateral wings of metathorax not broadly triangular. First three segments of fore and mid tarsi of male broadened and with about 12 large rounded pads ventrally; fore claws long, thin, with a weak indentation near the base; claws of midlegs broadened into an obtuse angle near the base; last segment of mid tarsi very long, longer than in the female, and longer than the preceding 3 segments together. Length 8—9 тат. Distribution. Northern and central zone of the European USSR, to the Kiev, Volyn and Bryansk region in the south; Transcaucasia (highlands); Siberia to Angara. Europe (only in Bosnia in the Balkans), northeastern Turkey (Erzerum — Sarikamis). Rare in the south. Ecology. It occurs in cold water, stagnant or running. *46. Gaurodytes arcticus (Payk.). Paykull, 1798, Fn. Suec.,1:201 (Dytiscus); Zimmermann, 1934:59.— ab. collaris Scholz,1917, Entom. Mitt.,6:251; subsp. alpinus 260 Mochul'skii, 1860,; Schrenck's Reis. Amurl., II, 2:102; Zaitzev, 1910:31.— Sibiricus Sahlberg, 1880, Sv. Vet. Ak. Handl.,17:56.— punctipennis Sahlberg, 1880, ibid.; subsp. ochoticus Poppius, 1908, Medd. Soc. Fn. Fl. Fenn., 34:54. Narrowly oval, slightly shining dorsally, brown; anterior part of head, lateral border of pronotum and stripe in middle of pronotum (which is often interrupted in the middle) and sides of elytra brownish yellow; this stripe varies in size, it may be either much broader dorsally and ventrally so that only a narrow line of the brown ground color remains, or only the anterior and posterior margin or the yellow median stripe may be strongly reduced or absent (ab. collaris); antennae and venter of the same color asin G.sturmi. Pronotum with a thin rim; in the female, sides of pro- notum with a slight indentation near the anterior angles. Sculpture of dorsum of male as in G.sturmi; it is coarser, with narrower loops in the female. Rows of dots on elytra weakly marked. Prothoracic process narrowly lanceolate, flat, pointed, with a thin lateral rim. Fore and mid tarsi of male аз in С. sturmi, but fore claws different: inner claw shorter, more strongly curved at the end, and varying in different localities: in the typical northern European form, this claw is broadened at the base in an obtuse angle; in subsp. alpinus, this broad part forms a strong angular denticle; this denticle is even larger and broader in subsp. ochoticus, and is rounded. Length 7—7.75 mm. Distribution. Northern Europe and whole north of Siberia to the Sea of Okhotsk and Kamchatka. Labrador. Circumpolar. ; The typical form occurs only in the north of the European USSR and in northern Europe; subsp. alpinus Motsch. occurs in Siberia to Trans- baikalia and in the mountains of Mongolia; subsp. ochoticus Popp. occurs in northeastern Siberia. *47. Gaurodytes (s. str.) zetterstedti (Thoms.). C.G. Thomson, 1854. Sv. Vet. Ak. Handl.:216 (Agabus); Zimmermann, 1934:59. Closely related to G.sturmi, differing from it in its darker coloration; pronotum of uniform color, without red lateral border; body more narrowly oval, with less rounded sides; sculpture of dorsum coarser; loops of net- work, especially in the female, smaller and denser; surface therefore appearing more rugose; pronotal process narrower, more convex. Length 8.5 mm. Distribution. Whole north of European USSR and Siberia to Chukchi Peninsula. Northern Europe. *48. Gaurodytes (5. str.) slovzovi Sahlb. J. Sahlberg, 1880, Sv. Vet. Ak. Handl., 17:59; Zaitsev, 1908, Russkoe Entomologicheskoe obozrenie, VIII:63; Zimmermann, 1934:60. 261 246 Oval, slightly convex, black, with a strong greenish sheen; the weakly marked spots on the vertex and sides of elytra brownish red; antennae rust red; last antennal segments with dark apex; fore- and midlegs rust- red; hind legs pitch black. Dorsum slightly shining, with a sharp network of small irregular polygonal loops which are more or less longitudinally oblong. Pronotum short, its sides slightly rounded, strongly narrowing anteriorly; lateral rim thin. Rows of dots of elytra hardly recognizable. Prothoracic process narrow, lanceolate, flat- convex; lateral wings of meta- thorax narrowly triangular. Anal sternite with a network, without longi- tudinal wrinkles. Fore and mid tarsi of male slightly broadened; last tarsal segment almost as long as the 3 preceding segments together; fore claws simple, almost equal. Length 8—9mm., This species resembles G.zetterstedti in the sculpture of the elytra, but differs from it in the distinct greenish sheen of the dorsum, the much shorter and markedly less narrow prothoracic process, and other characters. Distribution. This species is known only from 2 specimens: a female from Omsk is the type, and a male from Temir in West Kazakhstan. This is probably a steppe species which is possibly halophilous. 49. Gaurodytes (5. str.) conspicuus Sharp. Sharp, 1873, Trans. Entom. Soc. London:48; Régimbart, 1899:277; Zimmermann, 1934:61. This species is distinguished by its large and broad body. Broadly oval, strongly convex, equally narrowing anteriorly and posteriorly. Black; spots on venter, antennae and often also narrow lateral border of pronotum red; elytra brown, reddish brown at the base and at the sides; legs blackish brown; fore tibiae and tarsi red. Dorsum slightly shining, shagreened, with a network on head and pronotum which is finer, denser and slightly oblong longitudinally; network on elytra more distinct, broader and more transverse. Middle of base of pronotum projecting posteriorly ina rounded process; lateral rim sharp; posterior angles pointed. Rows of dots of elytra weakly marked, consisting of dense dots. Prothoracic process narrowly lanceolate, with a sharp lateral rim. Lateral wings of meta- thorax narrowly triangular. Legs short and thick. Fore and mid tarsi of male strongly broadened, with large rounded adhesive pads ventrally. Fore claws short, of equal length; inner claw slightly broader, less curved, with a weak indentation near the base. Length 9.5—11 mm. Distribution. Japan. *50. Gaurodytes (s. str.) kurilensis Kam. Kamiya, 1938, Journ. Tokyo Nog. Daig., V:35; Gschwendtner, 1939:20. "Broader than G.conspicuus; black; pronotum yellowish brown; anterior margin lighter. Length 10mm" (after Gschwendtner). Probably a color variant of G.conspicuus. Distribution. Kurile Islands. 262 247 51. Gaurodytes (5. str.) orientalis Kam. Kamiya, 1938, Journ. Tokyo Nog. Daig., V:35; Gschwendtner, 1939:20. Form of body resembling that of G.fuscipennis (Payk.) but the body is slightly broader anteriorly and posteriorly; dorsum more uniformly convex, slightly flattened only posteriorly; pronotum slightly shorter, narrower anteriorly, with a thicker lateral ridge; base more strongly indented near the pointed posterior angles. Dorsum shining; head and pro- notum blackish brown, with a strong metallic sheen; pronotum with a broad reddish yellow border; elytra reddish brown, slightly lighter at the base; sides and epipleura yellow; venter black; posterior margin of sternites 3—5 with a narrow reddish border; anal sternite reddish apically; antennae and legs reddish yellow; hind tibiae and tarsi darker. Head and pronotum with a network of irregular, strongly marked loops inside which the surface is smooth; elytra with a double network, i. e., smaller cells present inside the large cells at the base; smaller cells denser toward the middle, large loops more delicate and less marked, so that the network resembles that of G.fuscipennis at the apex but is more delicate and the loops broader. Rows of dots sharply marked. Prothorax andprothoracic process witha sharp keel; prothoracic process narrow and pointed, with a distinct depression on each side. Lateral wings of metathorax long and narrow. First 3 segments of fore and mid tarsi of male strongly thickened and laterally compressed. Fore claws moderately long; inner claw with a strong, pointed denticle proximal to the middle. Anal sternite with weak wrinkles at the posterior margin. Length 10—10.5 mm. Distribution. Japan, China (Manchuria, Yunnan). *52. Gaurodytes (s. str.) congener (Thnbg.). Thunberg, 1794, Diss. Ent. Ins. Suec., VI:75 (Dytiscus); Zimmermann, 1934:68; Csiki, 1946:653; Guignot, 1947:184; ab. foveolatus Mulsant, 1860, Opusc. Ent., Х1:177; female, ab. venturii Bertolini, 1870, Boll. Soc. Ent. Ital., 11:177; subsp. bergi Zaitsev, 1913, Izvestiya Kavkazskogo muzeya, VII:195. Oval, moderately convex, shining (male) or mat (female); black; dorsum often with a weak greenish metallic iridescence; spots on vertex and the narrow lateral border of the pronotum reddish; elytra pitch brown or reddish brown, rarely light brown (ab. foveolatus Muls.); antennae rust- red; last antennal segments usually dark apically; last segment of palps also dark at the end. Epipleura and legs rust-red; hind legs and all femora dark. Sculpture of dorsum almost the same in both sexes of the typical form; it consists of distinct, small, polygonal cells on head and pronotum; elytra delicately shagreened and also with a weak network which is finer than on the head; small dots at the crossing of the loops; a second form of female with a coarse sculpture and mat elytra (ab. venturii) is common in the mountains and in the extreme north. Pronotum broad, almost 2.5 times as broad as long, strongly narrowed anteriorly, with slightly rounded sides. Prothoracic process lanceolate, narrow, slightly convex, pointed, with a thin 263 248 rim at the margin. Lateral wings of metathorax not broadly triangular. The long spur of the hind tibiae is distinctly shorter than the 1st tarsal segment. Length 7-8mm. Male. First 3 segments of fore and mid tarsi moderately broadened; claws very long, simple, scythe-shaped; their inner margin weakly indented. The species is highly variable in coloration, size, sculpture, etc. Distribution. Northern and central zone of the European USSR: Transcaucasia, Siberia (except the steppe). Northern and Central Europe to England, France, northern Spain, northern Italy, Bulgaria; north of North America to Labrador. Very common. *52а. Gaurodytes (s. str.) congener bergi Zaitz. The principal form is replaced in the highland (alpine) zone of Trans- caucasia by a subspecies with more oblong and lighter elytra; this form is broader, and the prothoracic process is less convex. It resembles G.lapponicus Thoms. inthe form of the body, but it is larger. Distribution. Transcaucasia. *53. Gaurodytes (s. str.) lapponicus Thoms. С. С. Thomson, 1867, Skand. Col., [Х:108; Hellén, 1929, Not. Entom., IX:41; Zimmermann, 1934:67. — obovatus Sahlberg, 1875, Not. Sallsk. Fn. Fl. Fenn. Forh., XIV:176.— obscuripennis Sahlberg, 1875, Not. Salsk. Fn. Fl. Fenn. Forh., XIV:176 (Hellén, 1929). Closely related to G.congener, but differing from it in its smaller size (6—7 mm), the less rounded and narrower body, and especially in the much less broad fore tarsi of the male with less numerous adhesive pads (at most 25 pads; 40 inG.congener); another difference is that the fore claws of the male are not very long, as long as the claws of the midlegs. Distribution. Arctic zone of Europe and Asia (tundra). *54. Gaurodytes (s. str.) thomsoni Sahlb. J. Sahlberg, 1870, Not. Sallsk. Fn. Fl. Fenn., Х1:407 (Agabus); idem, 1873, ibid, XI1V:173; Zaitsev, 1910:36; Hellén, 1929, Not. Entom., [Х:42; Zimmermann, 1934:68; female,ab. coriaceus Sahlberg,1l.c.:174. Closely related to G.congener, but differing from it in its larger size (8—8.5 mm), the less rounded sides of the body which is more narrow oval, the narrow penis; the 2nd apex of the penis is more pointed and straight; penis of G.congener thicker, with an outwardly curved 2nd apex below the first apex. Female dimorphic: sculpture of dorsum either as in the male or with a coarse network (ab. coriaceus). Distribution. USSR: tundra; rare in Eastern Siberia. Ecology. It occurs in small water bodies, with cold clean water not overgrown with plants. 264 249 *55. Gaurodytes (5. str.) costulatus Motsch. Mochul'skii, 1859, Bull. phys.-math. Ac. Petrop., 17:541 (Agabus); Zaitsev, 1905, Russkoe Entomologicheskoe obozrenie, V:212; idem, 1910:37; Zimmermann, 1934:72. — tunkunensis Zimmermann, 1927, Wien. Entom. Zeitg., 44:178. The species differs from G.congener as follows: larger and broader; lateral wings of metathorax more broadly triangular; lateral ridge of pronotum slightly thinner; coloration of elytra usually lighter. Head and pronotum often greenish black, with a metallic sheen which is sometimes also present on the elytra; elytra brownish red; their coloration gradually becoming lighter at the base and laterally; epipleura, antennae and palps reddish yellow; last antennal segments usually black apically; legs red; mid femora less dark, hind femora very dark. Network on the elytra more distinct and coarser than in G.congener also ш the male; slightly more strongly marked in the female than in the male or more rarely very coarse, so that the elytra appears mat as inab. venturii. Fore claws of male simple, straight, curved only apically, as long as the last tarsal seg- ment. Prothoracic process narrow, more convex than in G.congener, sometimes almost keeled. Lateral wings of metathorax broad; posterior half of anal sternite usually with well marked longitudinal wrinkles. Length 8.25—9.25 mm. Distribution. USSR: Altai, East Siberia from the Sayan Mountains to Yakutsk and Kamchatka, Transbaikalia, Maritime Territory. Mountains of Mongolia. 56. Gaurodytes (s. str.) haroldi Lindb. Hindbers, 1933, Memor., Soc... Ев. Fl. Еепи., 9:121. This species differs from G.congener and related species as follows: pronotum slightly tapering anteriorly, lateral margin of pronotum almost straight; body markedly less convex; lateral margin of pronotum reddish, especially near the anterior angles; disc more distinctly shagreened and shagreened almost like the elytra; lateral wings of meta- thorax markedly narrower. The small folds which are usually present in G.congener and others near the apex of the elytra, near the lateral margin, are absent. This species closely resembles G.lapponicus. Length 6.5—7mm. (The present description is based on the 2 types obtained from Lindberg.) Distribution. Northern Finland. Ecology. Found in a brook in the tundra. *57. Gaurodytes (s. str.) levanderi Hellén. Hellén, 1929, Not. Entom., [Х:40. Female. Black; anterior part of head, spots on vertex, lateral margin of pronotum and legs red; femora dark; elytra reddish brown. Body short, 265 250 strongly convex; sides strongly rounded. Pronotum tapering anteriorly in straight lines; lateral rim of pronotum sharply marked. Elytra witha mat sheen; their microscopic sculpture resembles that of G.paludosus (Fabr.), and consists of very small loops of almost the same size; loops connected at some points by thin lines, forming a larger network; loops covered with numerous, coarse dots which are situated on 3 or 4 irregular, broad ribbonlike areas (?). Venter mat; prothoracic process as in G.congener, but the rim is more strongly marked; lateral wings of meta- thorax narrower and longer. Last sternite with several wrinkles at the apex. Length 8 mm. This species differs from the other species of the genus in the presence of numerous impressed dots on the elytra. It is closely related to G.con- gener, from which it differs in the larger, more convex body which is more rounded laterally; it also differs from it in the denser microscopic sculpture of the elytra. It resembles G.paludosus in the microscopic sculpture, but differs from it in the anteriorly more strongly tapering pronotum, and in the larger spur of the hind tibiae as inG.congener. It differs from G.costulatus Motsch. in its weaker sheen and from G.jacobsoni Zaitz. in the absence of numerous dots оп the elytra (after Hellén). I have not seen the original specimen. This is possibly a female of G.jacobsoni which was described from a single male from the vicinity of Leningrad. Distribution. USSR: Murmansk Region — Varzuga (one female). 58. Gaurodytes (s. str.) tibetanus Zaitz. Zaitsev, 1908, Ezhegodnik Zoologicheskogo muzeya Akademii Nauk, ХШ:425. This species differs from G.congener and related species in the black epipleura of the elytra (they are rarely brownish black), the lighter coloration of the elytra, which almost always have a weak bronze iridescence, more strongly impressed rows of dots on the elytra, and especially the more convex, almost keeled prothoracic process which is narrower, longer and more pointed; prothorax mat and punctate to the process; the reticulate microscopic sculpture of elytra more distinct, slightly stronger in the male; posterior half of anal sternite with dots and with a network which is equally well marked in both sexes. Length 6.5—7.5 mm. Distribution. China (eastern Tibet). *59. Gaurodytes (5. str.) pseudoclypealis Scholz. Scholz, 1933, Entom. Blatt., 29:74; Gschwendtner, 1939:21. Oval, moderately convex, shining, black; spots on vertex (often indistinct) and lateral margin of the pronotum (in the anterior half of the pronotum) often rust-red; elytra light chestnut brown (almost as in G.paludosus); antennae uniformly red, dark only at apex of last segment; apex of 2—3 pen- ultimate segments also rarely dark; legs uniformly yellowish red; hind 266 291 femora (rarely also mid femora) usually.dark. Dorsum delicately shagreened; network on head and pronotum coarser, consisting of irregular polygonal cells, and distinct on the elytra under medium magnification (X35), slightly more strongly incised in the female and with dots at the crossing of the loops (as in G.congener). Prothoracic process flat, broader than in G.congener; lateral wings of metathorax as narrow as in G.clypea- lis. Fore tarsi of male slightly broadened; fore claws equal, simple, shorter than last tarsal segment. Anal sternite without longitudinal wrinkles. Length 6.5—7 mm. This species differs from G.congener and related species in the flat prothoracic process; it resembles G.congener in the oval form of the body but differs from it in its smaller size, the distinct network consisting of irregular polygonal loops also in the male, the less broad fore tarsi the male, and the much narrower wings of the metathorax. It resembles G.clypealis in the flat prothoracic process and the narrow metathoracic wings, and has probably been confused with this species; it differs from it sharply in the microscopic sculpture of the dorsum; this sculpture consists not of dense, rounded, small cells but of polygonal irregular cells as in G.congener. It resembles G.paludosus in the coloration of the elytra; it differs from it in the larger spur of the hind tibiae, and in the distinct and different microscopic sculpture of the elytra (absence of dots inside the loops), etc. Distribution. European USSR: Yaroslavl Region (a large series identified by A. I. Yakovlev аз G.clypealis), Moscow and Kaluga region, Tatar ASSR, Zaporozhe Region, ''steppes of eastern Kirghizia.'' This species is apparently common in the forest zone of the European USSR. *60. Gaurodytes (s. str.) nigripalpis Sahlb. J. Sahlberg, 1880, Sv. Vet. Ak. Handl., 17:56 (Agabu s); Seidlitz, 1887:92; Zimmermann, 1934:69.— borealis Sharp, 1880—1882:513. Oblong, with almost parallel sides, narrow, pitch black, usually witha slight bronze sheen on the elytra; antennae red; several last antennal segments black in the apical half; palps red, last segment completely black, lighter only at the apex; legs rust-red; only hind femora slightly dark in the basal half; the 4 proximal segments of tarsi more or less dark dorsally; last segment completely black except a small spot at the apex; claws rust- red with black ends. Sculpture of elytra characteristic: it consists of rounded, small cells on the posterior half or third as in G.clypealis; the rounded cells become more or less angular and differ slightly in size in the anterior half. Pronotum slightly tapering anteriorly; lateral margin almost straight; lateral rim thick; posterior angles blunt. Prothoracic process slightly more convex than in G.congener; lateral wings of meta- thorax almost as broad as in G.congener. Fore and mid tarsi of male strongly broadened; fore claws long and slender, curved only at the end, of equal length; outer claw markedly indented on the ventral side. Sculpture on elytra of female either as in the male or much coarser; in that case their sheen is very weak, almost mat. Length 6.5—7.5 mm. Distribution. Arctic zone of the Holarctic Region from Norway to Greenland. Common. 267 2902 *61. Gaurodytes (s. str.) clypealis Thoms. Thomson, 1867, Skand. Col., [Х:107; Seidlitz, 1887:92; Zaitsev, 1908, Russkoe Entomologicheskoe obozrenie, VIII:62; Zimmermann, 1934:71.— scholzi Kolbe, 1916, Entom. Mitt., 5:253 (Zimmermann, 1934:72). Oval, slightly oblong; body abruptly tapering in the posterior quarter; body moderately convex, black, with a weak bronze iridescence; antennae red; last segment dark apically; legs rust-red; hind femora more or less black; tarsi lighter; lateral margin of pronotum with a narrow indistinct, diffuse, reddish border; elytra dark-chestnut brown, lighter toward the base and sides; first abdominal sternite and posterior margin of the following segments reddish. Dorsum shining; head and pronotum with a network of small, irregular cells; cells on elytra even smaller, rounded, with numerous very small dots between them. Prothoracic process flat, sometimes slightly convex, with a lateral rim. Lateral wings of metathorax slightly narrower than in G.congener. Anal sternite without longitudinal wrinkles, with a few dots and an irregular network in the posterior half. Fore and mid tarsi of male slightly broadened; fore claws not long, simple. Length 6—6.5 mm. Distribution. Northern and central zone of the European USSR to the Moscow, Gorky and Bryansk regions, Krasnoyarsk Territory. Rare. It has apparently spread into Europe from the taiga. Northern Europe to Silesia. *62. Gaurodytes (s. str.) setulosus Sahlb. J. Sahlberg, 1900, Acta Soc. Fn. Fl. Fenn., XIX:7; Hellén, 1929, Not. Entom., [Х:40; Zimmermann, 1934:71. Oval, slightly oblong, slightly convex; pitch black, sometimes lighter; antennae light rust-colored; last segment usually dark apically, or antennae of uniform color; legs rust-red; mid and hind femora often slightly dark; elytra chestnut brown to pitch black, with a slight bronze sheen. Dorsum shining, shagreened, with a delicate reticulate sculpture as ш G.congener. Antennae shorter than usual, with thickened middle segments. Pronotum narrowed anteriorly, with slightly rounded lateral margin; lateral ridge thick. Prothoracic process broad, flat, with a lateral rim. Lateral wings of metathorax narrowly triangular. Prothorax, metathorax and inner lobes of the hind coxae with sparse, short, whitish yellow hairs. Fore and mid tarsi of male slightly broadened; fore claws long and simple. Posterior half of anal sternite with a few dots and a network in both sexes. It resembles G.lapponicus; however, in addition to the above mentioned pilosity of the thorax, etc., it differs from it in the greater length of the pronotum (2.5 times as broad as long, while the thorax is 3 times as broad as long in G.lapponicus), the much narrower lateral wings of the meta- thorax, etc. Length 6—7 mm. Distribution. Murmansk Region, Karelia, Novgorod, Penza and Saratov regions (one specimen from each of the last three localities). Ecology. This species is apparently rare everywhere; it occurs in mountain brooks. 268 253 *63. Gaurodytes (5. str.) amoenus (Sols.). Sol'skii, 1874, Fedchenko, Puteshestvennik Turkestana, П:142 (Agabus); Zaitsev, 1907, Russkoe Entomologicheskoe obozrenie, УП:174; Falkenstrom, 1933, Ark. zool.,27A,1; idem, 1936, ibid., 29 A, No.5:2; idem, Lingnan Sc. Journ., 15, No. 1:93; Zimmermann, 1934:76. Broadly oval, strongly shining, black; head and pronotum usually with a strong, greenish bronze sheen; clypeus, spots on vertex and broad lateral stripe of pronotum which is sharply delimited on the inner side red; elytra brownish red, lighter laterally; epipleura, antennae, fore- and midlegs red; hind legs brownish, apex of femora red. Dorsum with a delicate sculpture; sculpture of head and pronotum consisting of distinct, irregular, polygonal cells; cells more delicate and narrower on pronotum than on head; cells on elytra very small, rounded, of equal size; there are also scattered small dots; hind coxae with a dense network of oblong loops. Pronotum strongly narrowed anteriorly; its lateral margin slightly rounded; base of pronotum rounded in the middle, with a distinct indentation on each side of the middle so that the posterior angles of the pronotum are pointed and slightly produced posteriorly. Prothoracic process narrow, oblong, lanceolate, with а border. Lateral wings of metathorax wedge-shaped. Fore and mid tarsi of male strongly broadened, with oblong adhesive pads; fore claws short, simple, of the same length. Length 9-10mm. Distribution. Eastern Transcaucasia and Middle Asia. The records of this species from China (Zimmermann — Shantung and Shansi, Falken- strom — Szechwan) should be confirmed, because the interpretation of G.amoenus by these authors raises doubts whether their specimens really belong to G.amoenus. 64. Gaurodytes ($. str.) hummeli Falk. Falkenstr6m, 1936, Ark. zool.,29 A, No. 5:2. This species was described from a single male from northeastern Szechwan Province (China); this specimen was found among a large series of G.amoenus; according to Falkenstroém this species closely resembles G.amoenus, but it differs from it as follows: elytra "are not pointed but rounded posteriorly ... fine punctation on head and pronotum almost absent; cells on elytra more distinct, more regularly rounded or polygonal, especially posteriorly, while in G.amoenus they are often semicircular, in form of fish scales; fine punctation distinct only laterally, anteriorly... Length 8.75 шт." Falkenstrém also mentions differences in the genitalia. All these differences are in my opinion individual variations. Moreover, the fact that these two closely related species were found together makes it doubtful that G.hummeli is a valid species. The status of this species should be confirmed by examination of further material. If G-hummeli proves to be a valid species, we have 3 additional specimens; they were found in Japan (Kyushu, Cherskii) and differ from G.amoenus as follows: elytra broadly rounded posteriorly, network on head and pronotum less strongly incised, fine punctation on elytra much sparser and cells on elytra more regularly rounded. 269 65. Gaurodytes (s. str.) regimbarti Zaitz. Zaitsev, 1907, Russkoe Entomologicheskoe obozrenie, VII:174; Zimmer- mann, 1934:76.— amoenus Régimbart, 1899:276. Closely related to G.amoenus, differing from it as follows: body less convex, narrower; sides less rounded; sheen weaker. Elytra more pointed posteriorly, darker, dirty brown, with a weak bronze sheen. Sculpture of dorsum markedly more distinct, visible already under low magnification. Inner claw of fore tarsi of male slightly more strongly curved, slightly thicker than outer claw, markedly broadened at the base. Lateral wings of metathorax slightly narrower. Length 9-10mm. Distribution. China (Szechwan, Shansi, Kweichow); northern India. 66. Gaurodytes (s. str.) sinuaticollis Rég. Régimbart, 1899:278; Zimmermann, 1934:77. Body more broadly oval than in G.amoenus, less narrowing posteriorly, more strongly convex. Coloration of dorsum almost as in G.amoenus; however, the broader pronotum has a less distinct bronze sheen; sides of pronotum with a diffuse, sometimes indistinct, reddish border; elytra reddish brown to dark, almost black, lighter toward the margin. Sculpture of dorsum more strongly incised, consisting of a polygonal network on head and pronotum; cells on elytra uniform, small, rounded. Prothoracic process slightly broader and thicker. Fore claws of male of 254 equal length, short, inner claw slightly thicker than the outer. Length 8-—9mm. (This species is unknown to me.). Distribution. South China (Yunnan); northern India. 67. Gaurodytes (s. str.) japonicus (Sharp.). Sharp, 1873, Trans. Ent. Soc. London:50 (Agabus); Régimbart, 1899:278 (part); Zaitsev, 1906, Russkoe Entomologicheskoe obozrenie, \1:173 (part); Zimmermann, 1934:77 (part); Falkenstrém, 1936, Lingn. Sc. Journ., 15, No.1:93; subsp. falkenstromi, nov.; — japonicus (part) Rég., Zimm., Falk. Oval, broad, shining, moderately convex, black; sides of pronotum with a narrow, red, indistinct border which is sometimes almost absent; epipleura, antennae, palps, tarsi, fore tibiae and knees red; head and pronotum usually with a bronze sheen; elytra chestnut brown to blackish brown. Dorsum with a network of polygonal, irregular loops; network distinct on head and pronotum; cells appear rounded оп the elytra under low magnification (X 35); however, it appears under higher magnification (Х 100) that the cells are polygonal, of almost uniform size. Prothoracic process lanceolate, slightly convex. Lateral wings of metathorax narrowly triangular (narrower than in G.congener). Fore and mid tarsi of male slightly broadened, hardly broader than in the female; claws simple. Length 7.5 mm. Distribution. Japan. 270 67a. Gaurodytes (3. str.) japonicus falkenstromi Zaitzev, subsp. nov. Smaller (6—7 mm); narrower; sides less rounded; elytra lighter; net- work on elytra fine, but the cells which appear rounded under low magni- fication are polygonal under high magnification (X 100) and not of equal size: some are slightly larger, others smaller and less rounded; they may be slightly larger in the anterior half. Distribution. USSR: Maritime Territory. Northern India, China, Vietnam. The distinction between the two subspecies is provisional. 68. Gaurodytes (s. str.) rufipennis Gschw. Gschwendtner, 1933, Entom. Anz., XIII:47; 1939:22. This species differs from the related species in the broadly triangular lateral wings of the metathorax. Dorsum of head and pronotum with an irregular polygonal network of broad loops; cells on elytra regularly rounded. Prothorax markedly broader between the front coxae than in G.aequabilis Gschw., and even broader than in G.japonicus Sharp; prothoracic process slightly longer and markedly broader than in the two above species. Lateral wings of metathorax almost 1.5 times as broad as in G.japonicus between anterior margin of hind and mid coxae. Head and pronotum black, with a slight metallic sheen; two spots on vertex and usually also lateral border of pronotum reddish; elytra reddish yellow, darker on the disc; venter black; end of process of prothorax, anterior margin of first sternite and posterior margin of sternites 3—6 reddish yellow; antennae, tibiae and tarsi of mid- and hind legs reddish yellow. Length 7—7.5 mm. Distribution. China: Amoi; Japan. 2 ee 69. Gaurodytes (s. str.) daisetsuzanus Kam. Kamiya, 1938, Journ. Tokyo Nog. Daig., V:34; Gschwendtner, 1939:22. Body more flattenedthanin G.japonicus Sharp. Dorsum mat; pronotum with a yellow lateral border; posterior angles of pronotum obtuse. Venter black; abdomen dark brown; legs yellowish brown. Length 7mm. Distribution. Japan. This species is identical with G.rufipennis according to Gschwendtner. *70. Gaurodytes (в. str.) aequalis Sharp. Sharp, 1880—1882:501 (Agabus); Zimmermann, 1934:78. Oval, slightly convex, shining, black with a slight bronze iridescence; pronotum with a narrow diffuse red lateral border; elytra light-chestnut brown, lighter laterally, sometimes with longitudinal rows of black trans- lucent spots (speckles); antennae, epipleura, posterior margin of abdominal sternites, and legs reddish yellow; only hind femora slightly dark. Pronotum strongly narrowed anteriorly, its lateral margin slightly rounded; lateral 271 256 rimthin. Dorsum completely covered withdense, small, round cells of uniform size; sculpture sometimes slightly stronger in the female. Prothoracic process lanceolate, slightly convex. Lateral wings of metathorax narrow. Fore and mid tarsi of male slightly broadened; fore claws short, of equal size. Length 6.5—7.5 mm. Distribution. USSR: Transbaikalia, Maritime Territory. *71. Gaurodytes (5. str.) aequabilis Gschw. Gschwendtner, 1923, Arch. f. Naturg., 89, A, 8:105; Zimmermann, 1934:78. Closely resembling G.aequalis, but smaller; elytra dark-chestnut brown; body very broad; all femora and hind tibiae black, prothoracic process shorter, with a blunt median keel; fore tarsi of male slightly less broad. Distribution. Uzbekistan (Fergana). China (Sintai (or Hsint'ai) the Muztagh Pass in Tien Shan). 72. Gaurodytes (s. str.) mucronatus Falk. Falkenstrom, 1936, Lingn. Sc. Journ., 15, No. 1:89; Gschwendtner, 1939:22. Female. Oval, relatively broad, rounded posteriorly, flattened. Head black (except the usual red-yellow spots on vertex and labrum); pronotum uniformly black, without metallic sheen; posterior angles of pronotum almost rectangular; elytra shining, yellowish brown, with a yellow border at the base and yellow epipleura; venter black; abdominal sternites 3—5 yellow on the posterior margin. Anal sternite yellow at the apex, witha weak indentation on the sides, produced into a spine posteriorly. Legs black; fore tibiae and fore and mid tarsi yellowish. Whole dorsum with a network of simple polygonal loops of uniform size; loops relatively large, as in G.uliginosus. Prothorax raised like a keel; prothoracic process lanceolate, long and pointed, almost flat. Lateral wings of metathorax broadly triangular. Hind tarsi long and narrow. The species was described from a single specimen. Length 8mm. Distribution. China (Szechwan). 73. Gaurodytes (s. str.) chinensis Zimm. Zimmermann, (1917) 1919, Arch. f. Naturgesch., 83 A, 12:211; Zimmer- mann, 1934:75. Broadly oval, with rounded sides, convex; black, shining; antennae, palps and tarsi red; head and pronotum uniformly black, with a distinct bronze sheen; elytra brownish red, lighter laterally; epipleura reddish yellow. Sculpture of dorsum consisting of dense, delicate polygonal loops which are slightly less incised in the anterior half of the elytra and slightly narrower 272 257 than on head and pronotum; loops denser, more regular and almost rounded in the posterior half. Pronotum broad, strongly tapering anteriorly, with an indentation on each side of the middle of the base which is slightly rounded and produced posteriorly. Prothoracic process broadly lanceolate, slightly convex, with a lateral border, produced into a short spine posteriorly. Lateral wings of metathorax broadly triangular. Hind-legs short; tibiae of hind legs broad; tibial spur larger, as long as the first tarsal segment; last segment of hind tarsi slightly longer than the preceding segment. Fore and mid tarsi of male slightly broadened, hardly broader than in the female; fore claws simple, of equal length. Length 7.5—8mm (after Zimmermann). Distribution. China, Japan. 74. Gaurodytes (5. str.) fulvipennis Rég. Régimbart, 1899:277; Zimmermann, 1934:75. Broadly oval, almost pointed posteriorly; strongly flattened, shining black,with a metallic sheen; pronotum with a very narrow reddish lateral border; elytra yellow, lighter toward the base; antennae red; legs black; fore tibiae, tarsi and knees rust-red. Dorsum with a dense network. Sides of pronotum tapering anteriorly, slightly rounded, with a thin rim; elytra (especially their posterior part) covered with very small black speckles. Lateral wings of metathorax narrow. Fore and mid tarsi of male moderately broadened, laterally compressed; claws simple. This species resembles G.amoenus Solsky, but is smaller, markedly broader, less narrow anteriorly, more pointed posteriorly; network on elytra markedly less delicate; cells polygonal, strongly incised. Head and prono- tum often with a bronze green sheen; elytra with very fine, dense speckles which are absent on the light base; lateral margin of pronotum with a narrow red lateral border. Length 8-8.5mm (after Régimbart; this species is identical with G.chinensis according to Feng). Distribution. China, including Tibet. 75. Gaurodytes (s. str.) granulatus Falk. Falkenstrom, 1936, Lingn. Sc. Journ., 15, No. 1:95. Oval, moderately convex, shining, black; pronotum with a broad reddish lateral border; elytra brown, lighter laterally; antennae, epipleura and legs reddish; hind tibiae and tarsi black. Sculpture of dorsum the same in both sexes; it consists of large polygonal cells with sharp outlines on head and pronotum; flat, posteriorly raised, small, rounded cells of almost uniform size on the elytra; these cells have coarse outlines (under a magnification of X 100); the elytra therefore appear slightly mat; dots in the rows small. Pronotum 3 times as broad posteriorly as long; its anterior part strongly narrowed, its margin almost straight with a thin rim; base rounded, indented on each side of the middle; posterior angles therefore pointed. Prothoracic process triangular, convex, pointed, with a lateral rim. Lateral 273 258 wings of metathorax moderately broad. Fore and mid tarsi of male moderately broadened; fore claws short, of equal length. Length 8.5 mm (after Falkenstr6m). Distribution. China (Szechwan). *76. Gaurodytes ($. str.) confinis (Gyll.). Gyllenhal, 1807, Ins. Suec., 1:611 (Dytiscus); Seidlitz, 1887:91; Zimmermann, 1934:61. Oblong, oval, convex, shining, blackish brown; epipleura, antennae and palps red; head and pronotum black with a weak metallic sheen; knees, fore tibiae and all tarsi rust-red; elytra pitch black, lighter laterally. Dorsum with a very delicate network; this network consists of small, irregular, polygonal loops on head and pronotum and of very small, dense round cells with scattered, small dots on the elytra. Rows of dots on elytra strongly marked, confused posteriorly. Prothorax raised, descending before the front coxae; prothoracic process narrow lanceolate, with a sharp keel; a shallow small groove on each side of the keel and a distinct lateral rim. Lateral wings of metathorax broadly triangular. Fore and mid tarsi of male slightly broadened, with adhesive pads оп a long stalk; fore claws simple, equal, short. Length 9—10 тат. Distribution. North of the European USSR; to the Novgorod, Moscow, ? Kiev and ? Orlov regions in the south; Tomsk Region, Yakutia. Northern and Central Europe, to Poland in the south; North America. This Species is circumboreal. *77. Gaurodytes (в. str.) infuscatus (Aubé). Aubé, 1838, Spec. Col., VI:330 (Agabus); Zimmermann, 1928, Wien, Entom. Zeitg., 44:180; idem, 1934:62; Hellén, 1930, Not. Entom., X:7.— dubiosus Poppius, 1905, Oefvers Finsk. Vet. Soc. Forh., 47:20; Hellén, 19219, Not. Entom., 0:43. - velidus №. за ее, 1905) Medds Soc. Е: Fenn. :15. Oval, moderately convex; elytra with a weak greasy sheen; head and pronotum black, with slightly greenish metallic iridescence; lateral margin of pronotum with a reddish border which is either present only at the anterior angles, or extends further posteriorly and inward, sometimes also along the anterior margin; elytra brownish, light to dark; their coloration is not continuous as usual but is diffuse and irregular, consisting of small brown speckles or small spots of varying size which are more or less fused; base and sides of elytra always lighter; epipleura, antennae and legs reddish yellow; last antennal segments usually black at the apex. Sculpture of head and pronotum consisting ofirregular polygonal loops; loops longitu- dinally oblong in the posterior half of the disc; sculpture on elytra consisting of small, dense, round cells; cells more strongly incised in the female; the usual rows of dots weakly marked. Middle of prothorax with sparse yellowish hairs, with a sharp keel, straight, not descending before the fore 274 сохае; prothoracic process reddish, lanceolate, pointed, with a deep depression on each side of the median keel. Lateral wings of metathorax broadly triangular. Antennae of male thicker than in the female; apical half of antennal segments slightly broadened; segments slightly serrated apically; fore and mid tarsi thick, with stalked adhesive pads ventrally; fore claws longer than last segment, curved only apically. Length 7—9.5mm. Distribution. A circumboreal species, distributed from northern Norway and the Murmansk Region, through northern Siberia to Transbaikalia, Mongolia, Canada and Labrador. *78. Gaurodytes fuscipennis (Payk.). Paykull, 1798, Faun. Suec., 1:209 (Dytiscus); Zimmermann, 1934:63; Csiki, 1946:652; ab. obscurior Sahlberg, 1873, Not. Sallsk. Fn. FI. Fenn., 14:170.— eversmanni Kolosov, 1930, Ent. Blatt., 25:86 (not Ballion). Broadly ovoid, strongly convex; posterior half of elytra flat, sloping; dorsum with a distinct greasy sheen. Pitch brown to black; broad lateral border of pronotum and sometimes also a narrower border at the posterior margin red; elytra pitch brown or reddish brown, lighter laterally, some- times brownish black (ab. obscurior); epipleura, antennae and legs red; femora dark. Sculpture of dorsum delicate, consisting of irregular, small, dense, polygonal loops on head and pronotum; cells even smaller on the elytra; loops in the anterior half of the elytra indistinctly polygonal, rounded in the posterior half. Venter very delicately shagreened. Rows of dots weakly marked, indistinct. Prothorax with a keel, raised in an angle between the fore coxae, with a small depression before the coxae; prothoracic process narrow, lanceolate. Lateral wings of metathorax narrow, wedge- shaped. Hind legs slender; tibiae almost as long as femora; first segment of hind tarsi 1.5 times as long as the larger spur of the tibia. Fore and mid tarsi of male slightly broadened, with stalked adhesive pads; fore claws long, straight, curved only apically; anal segment with longitudinal wrinkles. Length 9-10 mm. Distribution, Northern and central belt of the European USSR, to the Kiev Region in the south, Tatar ASSR, Saratov Region; Siberia to Yakutia. Northern and Central Europe, to northern Germany in the south. *79. Gaurodytes (s. str.) coxalis (Sharp). Sharp, 1880—1882:535 (Agabus); Zaitsev, 1905, Russkoe Entomologi- cheskoe obozrenie, V:39; 1910:40; Zimmermann, 1934:64.— nigriventris Sahlberg, 1880, Sv. Vet. Ak. Handl., 17:55 (not Mochul'skii; Russkoe Ento- mologicheskoe obozrenie, V:214).— в plichali Reitter, 1899, Deutsch. Entom. Zeitschr. :196; subsp. schmidti Zaitsev,1913. Izvestiya Kav- kazskogo muzeya, VII:197; subsp. ermaki, Zaitsev, nov. Broadly oval, slightly convex, slightly shining (male) or almost mat (female); brownish yellow; coloration and form of body resembling those 259 of species of Rhantus; pronotum with a diffuse dark transverse stripe 275 in the middle which is usually divided into 2 spots; elytra brownish in the middle, reddish yellow laterally; venter brownish yellow; metathorax, hind coxae and abdominal sternites (except first sternite) partly brown; antennae and legs yellowish red. Sculpture on head and pronotum consisting of a network with irregular, small, polygonal cells; on the elytra, the network consists of round, small cells of uniform size and weakly marked wrinkles visible only under high magnification; usual rows of dots hardly marked. Prothorax with a keel; prothoracic process narrow, lanceolate, pointed. Lateral wings of metathorax even narrower than in G.fuscipennis. Hind tibiae short and broad, shorter than femora. Fore and mid tarsi of male strongly broadened; fore claws distinctly different: inner claw short and broad, the outer claw 2 to 2.5 times longer, narrow, slender, slightly broadened at the base, sometimes forming an indistinct denticle; anal sternite with weak longitudinal wrinkles in the posterior half. Size and form of the body strongly variable: typical form larger (9.5—11 mm); sides of body strongly broadened. Distribution. Principal form: Chelyabinsk, Krasnoyarsk, Mal'ta station near Irkutsk, Belaya River (a tributary of the Angara), Kultuk. Mongolia. *79а. Gaurodytes (s. str.) coxalis ermaki Zaitsev, subsp. n. Smaller (8.2—9.2); sides slightly broadened. Distribution. The Bolshezemelskaya Tundra, Arctic Siberia: tundra north of Salekhard (a large series), Langr Island in the Amur Estuary (a large series), Sakhalin, Kamchatka. G.ajax Fall. described from Alaska possibly also belongs to this subspecies. *79b. Gaurodytes (s. str.) coxalis schmidti Zaitz. Closely resembling subspecies ermaki, but slightly narrower and longer (8.5—9.2 mm). Distribution. High mountains of Caucasus (Georgia, Armenia). *80. Gaurodytes (s. str.) nebulosus (Forst.). Forster, 1771, Nov. Spec. Insect., 1:56 (Dytiscus); Ganglbauer, 1892:495; Zimmermann, 1934:38; Csiki, 1946:646; Guignot, 1947:186; ab. pratensis Schaufuss, 1881, Verh. zool.-bot. Ges. Wien, ХХХ!: 620. — extinctus Scholz, 1917, Ent. Mitt., VI:250.— immaculatus Gschwendtner, 1927, Ver. Ges. Luxemb. Naturfr.,56:2; female,ab. rugosipennis Scholz, 1916, Ent. Mitt., 5:180. Broadly oval, slightly convex, shining, brownish yellow to yellow dorsally, black ventrally; a dark spot on each side of middle of pronotum; both spots sometimes fused into a diffuse spot; both spots sometimes pale or absent (ab. pratensis); irregular small spots and speckles on the elytra, mainly in the posterior half; these spots are fused or more widely separated in 276 260 some places; they are absent in the lateral yellow field behind the middle and along the suture; suture black; epipleura, antennae and legs reddish yellow. Dorsum with a very delicate sculpture which is slightly more strongly incised in the female; dorsum rarely with coarse sculpture, mat (ab. rugosipennis); this sculpture consists of an irregular network with narrow loops on head and pronotum; the sculpture on the elytra consists of small, dense, rounded cells. Inner claw of fore tarsi of male with a strong denticle at the base; last tarsal segment thickened in the apical half and with a small tuft or short cilia. Lateral wings of metathorax broadly triangular. Prothoracic process rooflike, almost keeled, narrow, lanceolate. Length 8—8.5 mm. Distribution. Whole European USSR, Transcaucasia, Turkmenia. Europe (except extreme north), Mediterranean. Ecology. It occurs in stagnant water; rarer than G.conspersus; it also occurs in the Alpine zone. *81. Gaurodytes (s. str.) conspersus (Mrsh.). Marsham, 1802, Ent. Brit., 1:427 (Dytiscus); Zimmermann, 1934:39; Csiki, 1946:647; Guignot, 1947:187.— luniger Kolenati, 1845, Melet, Ent., 1:82. Closely related to G.nebulosus, but distinctly different. Spots on pronotum normally absent; sculpture slightly more distinct; elytra without dark small spots or with few diffuse shades; hind femora black to the knees; anterior margin of clypeus with a hardly marked rim. Claws of fore tarsi of male moderately long; inner claw broadened in the basal half; outer claw with a blunt denticle at the base. Coloration variable; specimens from Asia Minor and Transcaucasia usually uniformly light yellow on the dorsal side. Length 7—8.2 mm. Distribution. South of the European USSR, Transcaucasia, West Siberia; records from Middle Asia need confirmation, since this species may have been confused with G.dichrous. Southern and Western Europe, North Africa, Asia Minor, Iraq, northern India. Ecology. It occurs in fresh or brackish water. *82. Gaurodytes (s. str.) dichrous (Sharp). Sharp, 1878, Journ. Asiat. Soc. Beng., XLVII, 2:169 (Agabus); idem, 1890, Sec. Yark. Miss. 180:38.— lederi Seidlitz, 1887:94. — luteolus Régimbart, 1899:275; Gschwendtner, 1923, Arch. Naturg., 89 A, 8:105; Zimmermann, 1934:40; Falkenstrom, 1936, Lingn. Sc. Journ., 15, No. 1:90. Oblong- oval, markedly longer and slightly narrower than the two preceding species. Dorsum clay-yellow or ash gray; only 2 dark spots near the eyes and a dark border onthe head; pronotum and elytra ofuniform color; elytra with- out dark spots or speckles. Venter blackishbrown; hindfemora black as in G.conspersus. Lateral ridge of pronotum distinctly thinner than in the two preceding species. Sculpture the same but even more delicate. Hind 277 261 legs thinner. Fore claws of male short; inner claw broadened in the middle in an obtuse angle which is more weakly marked than in G.con- spersus and often absent. Posterior half of anal sternite with a network of polygonal loops. Penis shorter than in G.iriedrichi, thicker in the basal part, more strongly curved, tapering already in the proximal third; basal half of parameres short, slightly longer than distal half, branching from the basal half at a right angle. Female dimorphous, more often shining аз the male, rarely mat. Length 7—8 mm. Distribution. USSR: Middle Asia — this species apparently occurs mainly in the highlands. Baluchistan, Mongolia, China (Sinkiang, Szechwan). Common, *83. Gaurodytes (5. str.) friedrichi Falk. Falkenstrom, 1936, Lingn. Sc. Journ., 15, no 1:91; Gschwendtner, NOS 99). у This species resembles G.dichrous inthe form of the body and the thin ridge of the pronotum, but differs from it in the darker coloration: head reddish anteriorly, black posteriorly; pronotum dark red; very dark on the sides of the disc; elytra dark red, lighter laterally; epipleura rust yellow anteriorly; dark behind 2nd sternite; legs red with more or less dark hind femora. Sculpture very delicate on elytra, more distinct on head and pronotum. Pronotum with a thin lateral ridge and obtuse posterior angles. Lateral wings of metathorax less broadly triangular than in G.conspersus. Anal sternite with a much less distinct network, only with transverse striation. Hind legs long, tarsi narrow. Inner fore claw of male broader than outer, with a denticle in the middle. Penis narrower than in G.dichrous, uniformly broad to ap of its length; broader in the last quarter than in G.dichrous; basal half of parameres almost twice as long as the distal part. Length 8—8.25 mm. Distribution. This species was described from a single specimen from China (Szechwan). I consider 3 specimens from eastern Kirghizia (Susamyr, Sumakov) as belonging to this species. *84. Gaurodytes (s. str.) lineatus (Gebl.). Gebler, 1848; Bull. Soc. Nat. Moscou, 21, Ш:75 (Agabu s); Poppius, 1905, Oefvers. Finsk. Vet. Soc. Foérh., 47:18; Zimmermann, 1934:37. Oval, moderately convex; head reddish yellow, frons more or less dark; pronotum dark brown, with a more or less broad diffuse reddish yellow lateral border; elytra reddish yellow with black suture and 5 longitudinal lines which are not sharply delimited from the background; these lines are often contiguous or fused in some places, especially in the posterior half; venter reddish yellow; thorax, hind coxae and 1st abdominal sternites brownish black; basal half of antennae and legs yellow. Dorsum slightly shining, almost mat in the female; pronotum of male almost smooth, with a weakly marked network; the network is more strongly incised in the 278 262 female ог slightly rugose laterally; elytra of male with a distinct network of polygonal, irregular loops and with small dots; this network is coarser and more strongly incised in the female and it consists of polygonal cells in the prescutellar field and of rounded, smaller cells in the other parts. Prothoracic process narrow, convex, laterally compressed. Lateral wings of metathorax broadly triangular. Fore and mid tarsi of male slightly broadened; inner claw of fore tarsi thicker and shorter than the outer, with а strong denticle inthe middle. Length 6—6.5mm. Distribution. Steppe zone of Siberia to Yakutia; it is not known whether this species occurs in the steppes of the southeast of the European USSR. *85. Gaurodytes ($. str.) desertorum (Е. Mor.). Е. Morawitz, 1863, Horae Soc. Ent. Ross., 1:169 (Agabus); lineatus Seidlitz, 1887:88; Zimmermann, 1934:37. Closely related to G.lineatus, but apparently different. It is slightly larger, slightly broader, more shining, lighter in color. Black lines on the elytra more sharply delimited from the light yellow or light orange back- ground, rarely contiguous in the posterior half; sculpture almost the same in both sexes, markedly more delicate than in G.lineatus. Length Бы АИ. Distribution. Steppe belt of the European USSR from the Crimea, Kharkov Region through the steppes in the southeast of the European USSR, to the steppes in southwest Siberia and Kazakhstan. Iran. Ecology. G.lineatus and G.desertonum occur mainly in brackish water. As their exact distribution has not been determined, it is difficult to decide whether they are different species or only subspecies. Another two species of Gaurodytes are incompletely described so that we cannot place them in a definite group. We give the original descriptions below. 86. Gaurodytes (s. str.) sawadai Kam. Kamiya, 1932, Mushi, 5,:6; Gschwendtner, 1939:23. Female. Oblong, black; abdomen, legs, antennae and palps dark brownish red. Pronotum short and broad; scutellum very small. Elytra with distinct dots and with 3 rows of dots. Length 9mm. Distribution. Japan (Honshu). 87. Gaurodytes (s. str.) kokoosson Feng. Feng, 1936, Peking nat. hist. Bull., 11:8; Gschwendtner, 1939:23. Oblong, convex, punctate in the posterior half, reddish dorsally and ventrally; pronotum reddish, its anterior margin black; lateral ridge thin; sides of metathorax, posterior part of coxae and posterior margin of first 279 263 sternite black; other part of venter reddish. Network and punctation of dorsum and venter fine; network on head and pronotum broader and more oblong, denser in the posterior half. Length 10 mm (one female). Distribution. China (Shansi) (or Shan-hsi). 2. Subgenus Anagabus Jak. Yakovlev, 1897, L'Abeille, XXIX:38. Type species: Anagabus semenovi Jak. Prothoracic process broad, rounded; its apex produced into a more or less long spine; hind femora without setae in the longitudinal depression at the inner apical angle, or with several very short setae. 1 (4). Body oblong-oval. Dorsum with delicate sculpture. Prothoracic process with a long or very long terminal spine. 2 (3). Larger (9-11mm). Pronotum heart-shaped, with a distinct inden- tation near the posterior angles; elytra with only a yellow lateral SUIS CMa Miles ooo be deulah С *88. G. (A.) semenovi Jak. 3 (2). Smaller (8.5-9mm). Pronotum slightly broadened before the middle; indentation near posterior angles less strongly marked. Base of elytra with a sharp yellow stripe continuing into the lateral LI NEG OF LIME и *89. G. (A.) sogdianus Jak. 4 (1). Body broad. Dorsum with coarse sculpture in both sexes. Pro- thoracic process short, pointed end. Uniformly black, sometimes with a small yellow spot behind middle of lateral margin of the elytra р Loe mei Aon a le 90. G. (A.) angulicollis (Rég.). *88. Gaurodytes (Anagabus) semenovi Jak. Yakovlev, 1897, L'Abeille, XXIX:38 (Anagabus). Oblong-oval, moderately convex, shining, pitch black, with a slight bronze sheen; lateral margin of pronotum with a narrow yellow border; lateral margin of the elytra with a slightly broader border; venter more or less dark in the middle; antennae and legs yellow. Dorsum delicately shagreened, densely punctate; dots on head and pro- notum coarser; slightly rugose laterally; dots on elytra more delicate, denser, connected by thin dashes in some places, forming a network. Pro- notum heart-shaped; its sides rounded, strongly curved upwards; anterior half of pronotum broad; pronotum distinctly tapering posteriorly; a well marked indentation near the rectangular or blunt posterior angles; lateral ridge thin; row of dots at anterior margin continuous but weakly marked. Shoulders of elytra strongly projecting, rounded; usual rows of dots consisting of large, scattered dots; rows not confused in the posterior part, separate to the apex. Antennae short, not reaching beyond pronotum. Prothoracic process raised like a roof,broad, with a short spine sposteriorly, with a thin rim to the spine. Anal sternite of male with a marked inden- tation in the posterior half, so that the apex of the sternite appears to project; 280 longitudinal wrinkles strongly pronounced; fore and mid tarsi strongly broadened; claws equal, simple. Lateral wings of metathorax very narrow (almost as in species of Eriglenus). Length 9-11 mm. Distribution. USSR: northern Tadzhikistan (Pendzhikent), Kirghizia (Susamyr, Sumakov). *89. Gaurodytes (Anagabus) sogdianus Jak. Yakovlev, 1897, L'Abeille, XXIX:39.— limbibasis Reitter, 1900, Wien. Ent. Zeitg., ХГХ:226. Oval, slightly oblong, slightly convex, shining, pitch brown; pronotum with a rust-colored lateral border which is broader in the anterior half; the elytra with a reddish yellow border at the base which does not reach the suture, tapers toward the shoulder and is there either interrupted or continues into the broad reddish yellow border of the lateral margin; venter reddish rust-colored; anal sternite black. Dorsum delicately shagreened; head and pronotum with a distinct network of irregular polygonal loops; elytra with small dots (which are less dense than in G.semenovi) and with a weak delicate network which is interrupted in some places; rows of dots as in G.semenovi. Pronotum slightly rounded in the anterior half, slightly narrower posteriorly, with a hardly marked indentation near the posterior angles which are slightly pointed; row of dots at anterior margin normal, double, slightly interrupted in the middle. Prothoracic process very broad, almost flat; its end produced into a long 264 pointed spine which is longer thanin G.semenovi. Lateral wings of metathorax as narrow аз ш G.semenovi. Anal sternite of male witha hardly noticeable lateral indentation and with longitudinal wrinkles in the posterior half; fore and mid tarsias ш G.semenovi. Length8.5—9 mm. Distribution. Tadzhikistan (Zeravshan and Gissar Ranges). 90. Gaurodytes (Anagabus) angulicollis (Rég.) Régimbart, 1899:273 (Agabus); Zimmermann, 1934:25. Oval, broad, slightly convex, slightly shining, black, with a slight metallic sheen; elytra often with a small yellow spot near the lateral margin, behind the middle; antennae rust-red; legs pitch black. Sculpture of dorsum distinct already under low magnification, slightly stronger than in the female, consisting of an irregular polygonal network, with isolated dots in- side the loops; sides of posterior half of pronotum also with longitudinal undulate wrinkles and coarse dots; sculpture of head and pronotum more delicate than on the elytra; row of dots at anterior margin of pronotum not interrupted; distance between the 2 median dots slightly larger than between the other dots; loops of network on the elytra slightly broader transversely than longitudinally; network in the posterior half consisting of smaller loops, coarser; usual 3 rows of dots of the disc with coarse dots, confused posteriorly; venter with weaker sculpture. Pronotum moderately tapering posteriorly; its lateral margin slightly rounded only in the anterior third; a weak but distinct indentation near the posterior 281 265 angles; as the base ofthe pronotum also has а slight indentation laterally, the posterior angles are pointed. Lateral margin of elytra steeply rising anteriorly; base of elytra slightly broader than base of pronotum. Pro- thoracic process broadly lanceolate, flat; its sides descend and have a small rim only in the posterior half; apex of process short and pointed. Lateral wings of metathorax very narrow, as in the two preceding species. Hind femora without a depression with hairs at the inner apical angle. Fore and mid tarsi of male slightly broadened; claws simple, short, thick, curved at the base; anal sternite with slight longitudinal wrinkles in the posterior half. Hind tibiae shorter than inG. (Hydronebrius) cordaticollis. Length 9.5mm. This revised description is based on the original male specimen sent by Régimbart. Distribution. China (Tibet, Szechwan). 3. Subgenus Hydronebrius Jak. Yakovlev, 1897, L'Abeille, XXIX:37; Zimmermann, 1934:15. Type species: Agabus cordaticollis Reitt. Pronotum heart-shaped; body flattened; hind femora without hairs in the depression on the inner rounded apical angle; sculpture very coarse. *91. Gaurodytes (Hydronebrius) cordaticollis (Reitt.). Reitter, 1896, Wien. Ent. Zeitg., XV:233 (Agabus); Yakovlev, 1897, L'Abeille, XXIX:37; Zimmermann, 1934:15. Body oblong, flattened, almost mat, brownish black; anterior part of head, 2 spots on vertex, disc of pronotum and legs slightly reddish; antennae and tarsi red. Sculpture characteristic: coarse, punctate-rugose. Head broad, with a transverse depression on each side, before the eyes. Elytra with dense dots and irregular, undulate, transverse wrinkles. Pronotum very broad and rounded before the middle, with an indentation behind the middle; posterior angles pointed, prolonged posteriorly; lateral rim present only in the anterior, broad half. Elytra markedly broader than pronotum; shoulders rounded; sides almost parallel, with a slight inden- tation near the apex, with a depression along the suture. Venter rugose- shagreened. Prothoracic process flat, punctate; its apex blunt and tapering. Lateral wings of metathorax narrowly triangular. Fore and mid tarsi of male slightly broadened; claws similar, simple; last segment of tarsi normal, as long as the 3 preceding segments together. Length 9 Oma Distribution. Uzbekistan, Tadzhikistan, mountains. 4. Subgenus ARC TODYTES Thoms. С. а. Thomson, 1874, Opusc. Entom., 6:541; Seidlitz, 1887:82; Zimmer- mann, 1934:10. 282 266 Туре species: Dytiscus elongatus Gyll. Last segment of fore and mid tarsi of male long; its ventral margin is broadened in an angle. Middle segments of antennae slightly serrated. Only one species. *92. Gaurodytes (Arctodytes) elongatus (Gyll.). Gyllenhal, 1827, Ins. Suec., 4:381 (D ytiscus); Seidlitz, 1887:82; Zimmermann, 1934:14. Body oblong, with almost parallel sides in the female, shining, moderately convex. Black; pronotum with a narrow reddish border; elytra witha broad, reddish border which is absent posteriorly; epipleura and posterior margin of abdominal sternites reddish; antennae and legs red; elytra with a weak greenish brown iridescence. Antennae thin; antennal segments 6—9 with a broad, blunt denticle at the inner side of the apex. Pronotum with almost straight lateral margin and a narrow rim; pronotum tapering anteriorly. Head and pronotum delicately shagreened, with network of narrow, irregular, polygonal loops; elytra with small, dense, rounded cells; usual rows of dots on the disc consisting of coarse dots, confused posteriorly. Prothorax keeled; prothoracic process flat. Fore and mid tarsi of male weakly broadened; first tarsal segment thick, broad; 4th seg- ment 1.5 times as long as the third; last segment longer than the 3 pre- ceding segments together; this segment is thickened in the middle and forms an obtuse angle; fore claws long, strongly curved at the base. Length ОЕ saoiealy Distribution. Arctic Europe and Siberia. The records of this species from Astrakhan and the steppes of Kirghizia (by Mochul'skii) are erroneous. Ecology. This species occurs in small water bodies with cold water, overgrown with Sphagnum. 5. Subgenus APATOR Sem. Semenov, 1899, Trudy Russkogo Entomologicheskogo obshchestva, XXXI:512; Zimmermann, 1934:10. Type species: Agabus kessleri Hochh. Anterior half of elytra with short longitudinal dashes, posterior half with short transverse dashes. Wings reduced. 93. Gaurodytes (Apator) bifarius (Kby.). Kirby, 1837, Fn. Bor. Amer., 4:71 (Agabus); Sharp, 1880—1882:537; Wickham, 1895, Canad. Entom.,27:118; Zimmermann, 1934:13; kessleri Hochhuth, 1871, Bull. Soc. Nat. Moscou, 44:238; Semenov, 1899, Trudy Russkogo Entomologicheskogo obshchestva, XXXII:512; idem, 1902, Russkoe Entomologicheskoe obozrenie, 11:136; Zimmermann, 1934:13. 283 Oval, moderately convex; male more shining; female less shining or almost mat; black; head, pronotum and sides of elytra diffuse reddish; antennae and legs red; last antennal segments black apically. Dorsum of male slightly shagreened; dorsum of female more strongly shagreened; sculpture of elytra characteristic: short longitudinal dashes in the anterior half; dashes in the posterior half of the same size but slightly curved and transverse; dashes in females, especially in mat specimens, longer and denser and sometimes forming narrow loops in the anterior half; usual rows of dots with coarse dots, confused and weakly marked because of the striation; venter less shagreened than dorsum. Pronotum with slightly rounded lateral margin, with a coarse lateral rim; disc with thin longitu- dinal dashes, sides with sharp dashes. Prothoracic process lanceolate, with a median keel. Lateral wings of metathorax narrowlytriangular. Fore and mid tarsi of male moderately broad; fore claws moderately and slightly curved. Length 6—7 mm. Distribution. USSR: Volyn, Yaroslavl, Vladimir, Sverdlovsk and Arkhangelsk regions; Siberia (after Zimmermann). Canada, northern Wis Se А? Ecology. This is an early-spring species (April—May); it occurs at the bottom among leaves and moss in shallow water of spring floods, at the edge of marshes and large puddles flooded by thawing snow, especially in the forest (Semenov). According to Poppius it occurs also in small river tributaries, especially rivers overgrown with sedge (August). 25. Genus Eriglenus Thoms. С.С. Thomson, 1860, Skand. Col., 11:55; Csiki, 1946:653; Gschwendtner, 1935:10. Type species: Dytiscus labiatus Brahm. Lateral wings of metathorax tongue-shaped at the end, with parallel or slightly convergent sides. Prothoracic process narrow, laterally compressed, with a weak median keel. First segment of hind tarsi almost as long as the two following segments together. Parameres with an appendage (rod or oval plate) at the end. This genus is represented by 4 species in the Palearctic Region. Key to Species 1 (2). Elytra reddish brown to black, with more or less variable yellow spots at the base of the elytra, at the sides and near the apex. Lateral wings of metathorax very narrow, with parallel sides. Hind tibiae with a more or less long row of setiferous pores at the lower О ME ana S/he Wis Gaainn aN) *1. Е. undulatus (Schrank) . 2 (1). Elytra uniformly pitch brown or clay yellow. Lateral wings of metathorax with a short, tongue-shaped process; sides of meta- thorax converging. 5917 284 3 (6). Smaller (at most 7mm); body oval. 4 (5). Pitch black or brownish yellow; pronotum and head more or less dark; network on-elytra/finer, loops thinner. 5.5—6.5mm ....°. Bre ee eee REE ORS Лон *2,. E.labiatus (Brahm.). 5 (4). Whole dorsum uniformly clay yellow; network more distinct; loops WAG rec ALDI о ity Mercere nth She es eres, Pe И м. *3. E.fulvaster Zaitz. Baayen ldarcer (Sam): broadly Оха... 4. E.zimmermanni Scholz. Key to the Known Larvae of Eriglenus Thoms. 1 (2). Head broad; sides of head slightly converging antergionrlyavi earners Бр Avia: емо Bolas Aino tel oe *1. Е. undulatus (Schrank). 2 (1). Head narrow, with almost parallel sides. ...*2. E.labiatus (Brahm). *1. Eriglenus undulatus (Schrank). Schrank, 1776, Beitr. Naturgesch.:70 (Dytiscus); Gschwendtner, 1935:12; Csiki, 1946:654; Guignot, 1947:193.— abbreviatus Fabricius, 1787, Mant. Ins.,1:191; ab. ruficeps Ménétriés, 1832, Cat. rais. :141; ab: interruptus Schilsky, 1888, Deutsch. Entom. Zeitschr.:183; ab. pic - tus Meier, 1899, Ent. Nachr., XXV:98; ab. imperfectus Meier, ibid. Oblong, oval, more flattened and less shining than E.labiatus; reddish brown to blackish brown, with a slight metallic sheen; sides of pronotum diffuse reddish; sides of elytra reddish yellow. The undulate band near the base sometimes divided into spots (ab. interruptus), or only a small spot near the scutellum (ab. pictus), or a small spot only in the shoulder region (ab. imperfectus), or basal band absent (ab. ruficeps); lateral margin connected with the basal band; short transverse spot near middle of lateral margin often divided; a small spot near the apex; venter reddish brown; antennae, legs and epipleura reddish yellow. Sculpture of dorsum consisting of a dense network which is more regular and denser on the elytra; numerous dots inside the loops (dots more numerous in the female); venter with a similar network and also with oblique or longitudinal striation; anal sternite with a few large dots and wrinkles. End of lateral wings of meta- thorax forming a long tongue-shaped process with almost parallel sides. Prothoracic process lanceolate, raised like a roof. Hind tibiae with a row of pores with spinules at the ventral margin. Claws of fore tarsi of male equal, not long. Length 7—8 mm. Distribution. Whole European USSR, except extreme north, Trans- caucasia (Talysh), Kirghizia (Frunze). Europe, to Spain, northern Italy and Balkans in the south. *2. Eriglenus labiatus (Brahm). Brahm, 1790,Ins. Kalend., 1:87 (Dytiscus); Gschwendtner, 1935:11; Csiki, 1946:654; Guignot, 1947:194. — femoralis Paykull, 1798, Fn. suec., 1:21; Ganglbauer, 1892:496.— impressus Zubkov, 1833, Bull. Soc. 285 Nat. Moscou, VI:317 idem, 1915:268. — eversmanni Вало, 1855, Bull. Soc. Nat. Moscou, XXVIII:237.— brunneus Hochhuth, 1871, Bull. Soc. Nat. Moscou, XLIV:240.— hochhuthi Zaitsev, 1907, Trudy Russkogo Entomologicheskogo obshchestva, XXXVII:160; var. pallens, Poppius, 1905, Oefv. Finsk. Vet. Soc. Forh., XLVII:22.—transcaucasicus Zaitsev, 1927:28. This species varies markedly in form of the body, coloration and sculpture. More or less oblong-oval, strongly convex, shining, pitch brown to brownish yellow (f. typica) or brownish, reddish or yellowish (var. pal- len s) with a slight metallic sheen; venter blackish brown; antennae (except apex of last segments), legs, epipleura and posterior margin of sternites 3—6 reddish yellow; light coloration sometimes more extended. Sculpture of dorsum consisting of a delicate polygonal, irregular network which is slightly more distinct or rarely very distinct in females; network with numerous small dots of different size at the crossing of the loops; rows of dots on elytra double or confused in some places, distinct; punctation of pronotum less marked; hind coxae and abdominal sternites with a coarser sculpture laterally; anal sternite with a few strong dots near the apex. Lateral wings of metathorax shorter than in E.undulatus; sides of metathorax not parallel, but distinctly converging. Claws of fore tarsi of male similar; parameres with а rodlike apical appendage. Length ББ = 0. аи. Coloration of dorsum varying from blackish brown to reddish yellow; the principal dark form apparently predominates in West Europe and the light form (ab. pallens) in Asia and Transcaucasia. Both forms with transitions occur in the east of the European USSR. Distribution. European USSR, highlands of Transcaucasia, Siberia to Sakhalin, steppes of Middle Asia. Northern and Central Europe, Mongolia. *3. Eriglenus fulvaster Zaitz. Zaitsev, 1906, Russkoe Entomologicheskoe obozrenie, VI:26. Closely related to E.labiatus, differing from it in the slightly narrower, more oblong body. Whole dorsum, including head,of uniform color, with a stronger sheen; network on the elytra delicate but its loops markedly wider, i.e., cells larger and loops wider; dots at the crossing of the loops much larger; usual rows of dots absent or sometimes hardly marked. Process of prothorax slightly longer and narrower. Appendage at apex of parameres of male markedly longer; parameres slightly narrower in the middle. Length 6.5 (mim: Distribution. Steppes and semidesert in the southeast of the European USSR, Kazakhstan (Astrakhan, Temir, Indersk [now Inderborskii village], Kazalinsk). 4, Eriglenus zimmermanni Scholz. Scholz, 1920, Entom. Blatt., XVI:15; Gschwendtner, 1935:13. "Broadly oval, shining, reddish brown with a weak metallic sheen; sides of pronotum and elytra lighter; venter blackish brown; antennae, legs, first 286 269 abdominal sternite and posterior margin of sternites 3—10 more or less reddish yellow. Sculpture of dorsum delicate, consisting of an irregular broad network which is more strongly incised and narrower on the head; punctation on head and pronotum fine and dense, more distinct on the elytra but slightly irregular; first 2 abdominal sternites with oblique dashes; following 3 sternites with transverse wrinkles; last segment with coarse dots and with a few large dots near the apex. Lateral wings of metathorax broader than in E.undulatus. Fore claws of male long, straight. Length 8mm. Distribution. Asia Minor. 26. Genus Agabus Leach. Leach, 1817, Zool. М15с., III:69; Zimmermann, 1934:11; Gschwendtner, ПОЗ ype рес. Dy tis cus “Serric ornisSePayk: Last 4 antennal segments of male club-shaped, forming a foliate club; their ventral side with a broad groove. First segment of hind tarsi of male 3 times as long as the second, strongly indented at the ventral margin in the male, less indented in the female; hind tibiae and the first tarsal segment of males with a brush of cilia at the ventral margin. Prothorax keeled, forming a sharp angle behind the fore coxae; this angle is markedly com- pressed laterally, with a high, sharp keel and a short process. Dorsum strongly convex. Resembling species of Ilybius. The genus contains only 3 species; one of them in the north of North America. Key to Species 1 (2). Oblong-oval, more convex. First 3 segments of the fore and hind tarsi of male are less broadened. Indentation at ventral margin О first segment of hind tarsi of male well-marked с. | REED О ие *1. А. serricornis (Payk.). 2 (1). Body broader, less convex. Indentation of first segment of hind tarsi of male weakly marked. Fringe of cilia on hind tibiae and lst segment of hind tarsi of male less marked. Fore tarsi of male more disiinetiy Droadeneq™ ti. sie. ete wre *2. A.clavicornis Sharp. *1. Agabus serricornis (Payk.). Paykull, 1799, Acta Acad. Sc. Stockholm:49 (Dytiscus); Sharp, 1880—1882:536; Gschwendtner, 1935:16.— minor Sahlberg, 1873, Not. sallsk. Fn. Fl. Fenn., XIV:170; 199. Oblong, ovoid, moderately broad, strongly convex, slightly shining, pitch brown to black; area behind head, spots on vertex, sides of pronotum and 287 270 elytra, antennae, legs and epipleura brownish red. Dorsum delicately shagreened; network of head and pronotum consisting of small polygonal loops; network on the elytra consisting of dense rounded cells with small dots; sculpture slightly more distinct in the female. Rows of dots on elytra weakly marked, these dots very small, widely separated; rows confused posteriorly. Last 4 antennal segments forming a foliate club with a ventral groove. Pronotum moderately tapering anteriorly; lateral ridges of pro- notum shining, sharp; transverse row of dots at the anterior margin con- tinuous. Prothoracic process markedly laterally compressed, with a high keel in the middle; sides with a rim, and a short terminal process. Lateral wings of metathorax tongue-shaped, as in Eriglenus. Fore and mid tarsi of male markedly broadened; fore claws longer than last segment, slender and similar. Hind tibiae of male with a brush of long yellow cilia on the ventral margin; first segment of hind tarsi long, its dorsal margin rounded, its ventral margin deeply indented, with a brush of cilia as on the tibiae. Length 9—11 mm. Distribution. North of the European USSR to the Novgorod Region, north of Siberia; the record of this species by Gschwendtner from Kyakhta is erroneous. Extreme north of Europe. Ecology. At the banks of small lakes, mainly among Hypnum in the tundra. *2. Agabus clavicornis Sharp. Sharp, 1880—1882:536; Zaitsev, 1910:41. Closely related to A.serricornis, differing from it in the broader and less convex body, the darker coloration, the slightly more distinct sculpture on the dorsum; fore and mid tarsi of male more strongly broadened; indentation at ventral margin of the 1st segment of hind tarsi of male less marked and dorsal margin less curved; fringe of cilia on ventral margin of hind tibiae and the first tarsal segment much shorter. Length 9—10.5 mm. Distribution. USSR: south of Yakutia, Transbaikalia. Northern Mongolia. 27. Genus Platynectes Rég. Régimbart, 1878, Ann. Soc. Ent. Fr., (5), УП:454; Gschwendtner, 1935:7. Type species: Dytiscus decempunctatus F. Body slightly convex, broadly oval, flat. Prothoracic process broad and flat. Lateral wings of metathorax narrow, tongue-shaped; epipleura tapering posteriorly at level of 2nd abdominal sternite. Row of setae on hind femora situated near posterior margin of inner apical angle. The genus contains over 30 species which are distributed mainly in the Indo-Malayan and Neotropical regions. Several species occur also in northern India and South China; P.dissimilis Sharp occurs in Japan. 288 1. P.dissimilis Sharp. Sharp, 1873, Trans. Ent. Soc. London:50 (Agabus); idem, 1880—1882:543; Régimbart, 1899, Ann. Soc. Ent. France, LXVIII:288; Gschwendtner,1935:10. The yellow pattern on the elytra consists of a border at the margin and 6 longitudinal lines; these lines are often interrupted or fused, sometimes nearly absent. Length 6mm. Distribution. Japan, China. This species may occur in Manchuria and possibly also in the Far East of the USSR. 28. Genus Platambus Thoms. С. а. Thomson, 1860, Skand. Col., 11:54; Gschwendtner, 1935:3; Csiki, 1946:655; Guignot, 1947:168. Туре сресез: уса maculatus ©. This genus differs from the other genera of the tribe as follows: epipleura broad, their margin converging only at the level of the anal sternite. Lateral wings of metathorax narrow, tongue- shaped. Mid tarsi more widely separated than usual by the metathoracic process. Hind legs thick. Only the larva of Р.тасч1афив (L.) has been described (Figure 53). This genus contains 9 species, most of them in Southeast Asia. ist : - \) И Key to Species 1 (8). Sculpture of dorsum consisting of a delicate, more or less marked network and very fine punctation. 2 (3). Rows of dots on elytra with slightly impressed dots forming groups of 2—4 dots which are sometimes weakly marked а: *1. Р. maculatus (L.). ne. tec 3 (2). Rows of dots with deeply impressed and widely separated dots which are usually single, especially in the anterior half. 4 (7). Larger (7.5—8 mm). 5 (6). A continuous yellow lateral border absent; only a yellow spot behind the middle, near the lateral margin .. 2. P.pictipennis Sharp. 6 (5). Yellow border at the lateral margin continuous... P.escalerai Rég. 7 (4). Smaller (6.5—-7mm). Elytra with yellow border at the base which passesi into, the lateral border, ил. cu *4, P.fimbriatus Sharp. 8 (1). Sculpture of elytra consisting of large and small dots; network present only near the scutellum ....... *5. P.lunulatus (Stev.). 289 272 *1. Platambus maculatus (L.). Linné, 1758, Syst. nat., ed. 10, 1:412 (Dytiscus); Gschwendtner, 1935:3; Csiki, 1946:635; Guignot, 1947:168; ab. inaequalis Panzer, 1794, Fn. Germ., XIV, t.8; ab. inornatus Schilsky, 1888, Deutsch. Entom. Zeitschr.: 183; aterrimus Sahlberg, 1900, Medd. Soc. Fn. Fl. Fenn., XXVI:71; subsp. pulchellus Heer, 1839, Fn. Helv.:149; subsp. graellsi Gemminger Harold, 1868, Cat. Col., П:455; subsp. caucasicus Zaitzev, 1928:18. Body oval, more or less convex, broader or narrower, usually shining; coloration of dorsum very variable. Background reddish-yellow; anterior and posterior margin of pronotum with a brown border which sometimes extends to the middle; suture, a narrow border at the base of the elytra, and 4 more or less marked lines brown to blackish brown; if the brown color is very extensive, there remains only a stripe at the lateral margin and a spot near the scutellum of the reddish yellow background color (ab. inaequalis), or only a lateral border (ab. inornatus), or the whole background color may be absent (aterrimus Sahlb.); these color forms are connected by transitions. The sculpture of the body may also vary: dorsum normally witha delicate polygonal network and 1—4 small dots in the loops; network sometimes coarse in the female (subsp. graellsi), network sometimes very delicate and dorsum more shining (subsp. cauca- sicus); body less convex (or smaller and narrower — subsp. pulchellus); loops of network on head and pronotum usually narrower and more distinct. Prothorax markedly convex, almost keeled, with a small depression behind the fore coxae and with a strong keel on the broad prothoracic process which is covered with scattered, large dots. Anal sternite of male with sharp longi- tudinal wrinkles. Fore and mid tarsi of male slightly broadened; claws simple, of equal length, slightly curved. Length 7—8.5 mm. Distribution. The principal form is distributed throughout the whole European USSR and West Siberia; it has not been recorded from East Siberia so far. Europe, Asia Minor; it is rare in the south and prefers highlands to the subalpine zone, forming several subspecies: subsp. graell- si inthe Pyrenees; subsp. pulchellus inthe Alps in Central Europe; subsp. caucasicus in the highland forests of the Greater and Lesser Caucasus to the Kars Plateau; it possibly occurs also in the mountains of Asia Minor. Ecology. Lakes and especially near banks of water bodies with running water. 2. Platambus pictipennis Sharp. Sharp, 1873, Trans. Entom. Soc. London:49; Régimbart, 1899:280; idem, 1902, Bull. Mus. hist. nat. Parix, УП:337; Gschwendtner, 1935:5. Form of body as in P.maculatus; strongly shining, blackish brown, with a light bronze sheen; lateral margin of pronotum reddish; coloration of elytra markedly varying from variegated to almost uniformly colored; both yellow spots at the base usually more or less fused into a broad band, 290 273 3 light yellow spots at the sides (one behind the shoulder, the 2nd in the middle, the 3rd near the apex); these spots are often more or less reduced; only small spots sometimes in the middle of the sides. Venter reddish brown; epipleura, antennae and legs (except tibiae) reddish yellow. Sculpture of dorsum consisting of a delicate network and 1—3 small dots in the loops; network on head and pronotum more distinct. Rows of dots on elytra consisting of deeply impressed, widely separated dots and some small dots, especially in the anterior half. Prothorax keeled; prothoracic process almost flat, with delicate small dots of different size. Fore and mid tarsi of male slightly broadened; claws simple; anal sternite with longi- tudinal wrinkles. Length 7.5—8 mm. Distribution. Japan, Korea. 3. Platambus escalerai Rég. Régimbart, 1900, Bull. Soc. Entom. Fr.:123; Gschwendtner, 1935:6. Markedly oblong, strongly shining; dorsum with a delicate network; rows of dots on elytra consisting of large, separated dots. Head reddish yellow; pronotum of the same color as the head; anterior and posterior margin of pronotum with a broad, diffuse, dark area; elytra blackish brown, with a broad yellow lateral border divided by a brown stripe, with 3 pro- cesses on the inner margin (as in P.maculatus); base of elytra with a yellow triangular spot with a process to the shoulder which is connected with the lateral border. Venter, antennae and legs reddish yellow. Length 7.1—8.5 mm (after Régimbart). Da Striibutvon:: Western Iran. *4, Platambus fimbriatus Sharp. Sharp, 1884, Trans. Ent. Soc. London:445; Régimbart, 1899:280; idem, 1902, Bull. Mus. hist. nat. Paris, УП:336; Gschwendtner, 1934, Ent. Anz., XIV:73; idem, 1935:5; subsp. excoffieri Régimbart, 1899:281.— kan- souis Feng, 1936, Peking nat. hist. Bull., 11:9 (see Gschwendtner, 1939:24). Oblong-oval, narrower than P.maculatus, with a strong sheen; reddish brown, dark dorsally, lighter ventrally; sides of pronotum with a yellow triangular spot which sometimes extends inward almost to the middle of the elytra; a yellow band at the base which does not reach the suture, is usually broad, and has a posterior process in the prescutellar field; it tapers toward the shoulder, is sometimes more or less reduced, passing into the broad yellow lateral border which usually has 3 more or less marked small invaginations into the dark background on the inner margin; border some- times with 1—3 brown longitudinal dashes. Venter brownish red; hind coxae and anal sternite darker at the apex; antennae and legs reddish yellow. Sculpture of dorsum more delicate than in P.escalerai. Claws of fore tarsi of male of slightly different length; wrinkles on anal sternite weaker. Epipleura with a row of large dots. Length 7—7.2 mm. Distribution. Japan. 291 274 4а. Platambus fimbriatus ехсо ег! Rég. Differing from the nominate subspecies аз follows: network on elytra slightly more distinct; wrinkles on anal sternite of male slightly more strongly marked; prothoracic process slightly more flattened; yellow lateral border of elytra usually divided by a blackish longitudinal stripe from near the apex toward the shoulder so that the yellow lateral border is double; inner half of this border with 3 processes on the inner side, one before the middle, one in the middle and one in the posterior third. Distribution. China (Kansu, Yunnan). *5. Platambus lunulatus (Stev.). Steven, 1829, Mus. hist. nat. Univ. Mosquens.:26 (Agabus); Zaitsev, 1909, Russkoe Entomologicheskoe obozrenie, [Х:407; Gschwendtner, 1935:3.— sinuatus Aubé, 1936, Icon. Col., V:148; Apfelbeck, 1904, Kaf. Balkanhalbins., 1:384. Oval, oblong, broad, moderately convex, almost mat; dark reddish brown; sides of pronotum and often a more or less marked area on disc of prono- tum reddish; elytra with a broad triangular yellow spot in the region of the scutellum which extends to the shoulder and passes into the narrow lateral border running slightly obliquely inward and slightly beyond the middle; its inner margin forms 2 inwardly-directed processes: one before the middle and one at the end; there is also a small yellow subapical spot; the pattern may vary as follows: the band at the base may be reduced to a small spot near the middle, or it may be absent; the lateral border may be shorter or longer, but never reaches the apex; the small apical spot may be absent; venter reddish brown; anal sternite dark. Sculpture of dorsum very characteristic: the usual polygonal network of species of Platambus is present only in small areas on the head, on the pronotum and in the scutellar region; the other space is covered with coarse, dense dots of different size which form wrinkles laterally and toward the apex. Prothorax slightly convex, covered with dense small dots and also with sparse, larger dots; prothoracic process flattened. Tarsi of female slightly broadened; fore claws of equal length; anal sternite with wrinkles. Length 8—9 mm. Distribution. USSR: Transcaucasia: common in the mountains and in the plains, Dagestan. East Mediterranean, Iran. Оо ribere @RYAViB Et UNL Régimbart, 1895:4; Zimmermann, 1934:2; Csiki, 1946:656; Guignot, 1947:195; Gschwendtner, 1935:16. Medium-sized species. Prothoracic process strongly convex or witha median keel, laterally compressed. Claws of hind tarsi of different length: outer claw always shorter than the inner, usually less curved apically. Posterior margin of first 4 segments of hind tarsi projecting posteriorly in the outer ventral half in form of a triangle or lobe. The tribe contains 12 genera, many of which are not Palearctic. 292 Key to Genera il (4). Hind femora with a small linear groove on the outer side, near the inner apical angle; the groove contains short setae. 2 (3). Prothoracic process strongly compressed laterally, convex, narrow Be Benches te elie ИЕ CAG) ora Sch ik il И ae ee a 29. Dybius Er. 3 (2). Prothoracic process broad, lanceolate .... 30. Colymbinectes Falk. 4 (1). Hind femora without or with only a few setae; in the latter case, the setae are situated not near the inner apical angle but in the middle of the apical margin. Last tarsal segment not longer than penulti- mate segment. 5 (6). Anterior margin of metathorax with a depression оп a large area between the mid coxae. Lateral ridge usually present on pronotum. Dorsum yellow, with dense black speckles on the elytra; these speckles are almost absent only in one species; in another species the dorsum is uniformly black or blackish brown with light sides А В КО ОЖ 3. Rhantus Luc. 6 (5). Metathorax flattened or with a narrow, indistinct, longitudinal depression between the mid coxae. Lateral ridge on pronotum 1 CSN aw ae НА ана 1%, 32. Colymbetes Clairv. о 29. Genus Ilybius Er. Erichson,1832,Gen. Dytisc.:138;,,Scholz, 1915, Ent. Blatt., X1:236; Gschwendtner, 1935:17; Csiki, 1946:657; Guignot, 1947:196.— Agabidius Seidlitz, 1887:97. Ey Per эрестес: 1 yet US.C. uiSy, awe rT .Deg. Body oval, oblong, markedly convex in most species, black or blackish brown, sometimes with a yellow lateral border, often with a bronze sheen. Sculpture of dorsum consisting of a network of narrow loops and of a second, finer, more delicate network which is present either only in the posterior third or on the whole elytra. Frons with 2 deep transverse grooves. Pro- notum short, trapezoidal, with more or less rounded posterior angles, closely contiguous to the elytra. Longitudinal rows of dots (sutural row, 2 rows on the disc, 2 lateral rows and one row at the lateral margin in the posterior half) weak or absent. Epipleura markedly tapering from the 2nd sternite onward. Prothoracic process strongly compressed laterally and pointed. Inner apical angle of first 4 segments of hind tarsi more or less strongly produced posteriorly in form of a lobe; claws of hind tarsi usually of markedly different length. Males differ markedly from the females in the sculpture of the anal sternite: posterior half of anal sternite of male of many species with a more or less long keel and longitudinal wrinkles which are more or less marked; keel and wrinkles more or less strongly reduced in some species. Apex of anal sternite of female more or less strongly indented and raised before the notch. Penis of male symmetrical; both parameres similar. This genus contains about 30 species distributed in the Holarctic Region. 293 276 Key to Species Lateral wines) of metathoraxmong tongues shapeds о. staal APO RES AU NES Я *1. I. fenestratus (Fabr.). Lateral wings of metathorax more or less broad, wedge-shaped. Larger (13—14 пт). Anal sternite of male with a sharp longitu- dinal keel. Outer claw of hind tarsi of male pointed and curved И *2. Т. ater (Deg.). Smaller (to 11.5 mm). Sides of elytra without yellow border, uniformly black. Body convex. Broadly oval, larger (10.2—11.5 mm). Lateral wings of metathorax narrow but not tongue-shaped. Anal sternite of male without keel in the posterior half, with weak wrinkles in the male, without wrinkles inthe female ......... а. peek Sutera Se С ее *3. I.crassus Thoms. Anal sternite of male with a sharp, long keel flanked by distinct, long wrinkles; wrinkles shorter but distinct in the female. Markedly narrower and smaller......... *4. I. poppiusi Zaitz. Lateral wings of metathorax broader, wedge-shaped. Dorsum black. Anal sternite of male with a longitudinal keel. Hind tarsi of male with a rim at the outer margin; both claws of fore tarsi of male with a denticle in the middle. Elytra of female with a marked subapical indentation. Larger (11.5 тт) ...... Е О *5. I, quadriguttatus Boisd. et Lac. Hind tarsi of male with straight outer margin, without rim. Fore claws simple. Elytra of female without subapical indentation. Shaneiiere (ов О Бе oe Bg QOS ое В аль *6. I. similis Er. Dorsum always with a bronze sheen. Anal tergite of male without longitudinal keel, withnumerous long longitudinal wrinkles; apex wna а иена оо ba Gblea eval od eon elo. c *7. I. subaeneus Er. Smaller (8.5—9.7mm). Sculpture of dorsum of female normal, delicate. Dorsum black, without bronze sheen. Anal sternite of male with a short keel at the apex, flanked by short wrinkles. In the female, indentation flanked by a depression and weak, short wrinkles; end of sternite projecting from the indentation in form of a blunt spine а а р oa Ee Ra San Pes *8. I. guttiger (Gyll.). Dorsum with a more or less marked bronze sheen. Last antennal segments usually black at the apex. First four segments of hind tarsi of male with a broad ridge; their outer angles not raised apically. Keel in posterior half of anal sternite of male long, sharp, flankedby numerous strong wrinkles. Body regularly oval. Lateral ridge of pronotum thin. Network of elytra consisting of small loops; usual rows of dots weakly TAT REC А AONE ПА WRN) Aner Seren *9. I. angustior (Gyll.). Body markedly broader anteriorly than posteriorly. Lateral ridge of pronotum thicker and broader. Network of elytra consisting of broader loops; rows of dots well marked... *10. I. obtusus Sharp. 294 277 229. FIGURE 54. Deg. Larva. Last antennal segments usually uniformly yellow. First 4 seg- ments of hind tarsi of male with a thin ridge; their outer angles distinctly raised. Keel of anal sternite of male very short, in form of a tubercle; wrinkles lateral to the keel hardly marked; end of anal sternite of female without spine; wrinkles hardly AUST NC aM aro оо оо оо о о о diodio os\as *11. Г. аепезсеп$ Thoms. Dorsum of female with coarse sculpture consisting of a strongly incised network; hind coxae almost mat (male unknown) ...... 5 оао во а Та oon ddr оо ово оО *12. I. ovalis Gschw. Sides of elytra with a more or less broad yellow border. (10.2—-11.2mm). Body convex ....... *13. I. fuliginosus (Fabr.). Smaller, at most 9.3mm. Dorsum slightly convex. Prothoracic process ending ina short spine. Lateral yellow border of elytra diffuse on the inner side, without broadened parts or processes near the apex ...%*14. I. lateralis (Gebl.). 28 (27). Prothoracic process produced posteriorly in a long spine. Lateral yellow border sharply delimited from the dark back- ground on the inside; broadened and pro- jecting inward at the apex, forming 2 or 3 processes. Lateral wings of meta- thorax narrow. 29 (30). Yellow lateral border of elytra about М as broad as elytra near the shoulders, broader toward the middle and beyond; a yellow window which is sometimes connected with the broad part of the lateral border inside the border behind the middle; posterior 7/3 of border divided by a moniliform dark stripe of dots. Rows of dots of elytra weakly marked. Lateral wings of metathorax tongue-shaped, very NAGrow ONG sic ved *15. 1. apicalis Sharp. 30 (29). Lateral border broad at the shoulders, a third or quarter as broad as elytra, slight- ly broader in the middle; window absent; moniliform stripe rarely marked, weak. Rows of dots on elytra distinct. Lateral wings of metathorax in form of a broader Ilybius ater tongue which is half as long or shorter. . By sd sa arts Cores НО *16. I cinctus Sharp. Key to Larvae of Ilybius Er. Cerci with 7 setae in 2 groups; secondary setae absent. Process of abdomen long or moderately long. Body brown, with numerous small, distinct light spots. Abdominal process long. 295 278 3 (4). Head constricted posteriorly; stipes of maxillae without crotchets. Stagilllere (ДБ) бай, oc о oc *5. I. quadriguttatus Boisd. et Lac. 4 (3). Head without constriction posteriorly. Stipes of maxillae with 2 crotchets. Larger (20—25mm) (Figure 54) .... *2. Later Deg. 5 (2). Brown, with less numerous, large fused spots. Abdominal process IG AKOLOUS) REE HRS! vail OVOVCRN не *7. I. subaeneus Er. 6 (1). Cerci with 7 setae; setae irregularly arranged, secondary setae present. Abdominal process short. 7 (8). Body dark brown; sagittal line on vertex dark. Third antennal Seommeniolackeeo ically ars eile ores *13. I. fuliginosus (Fabr.). 8 (7). Vertex dark violet or black. Sagittal line light. Third antennal segment indistinctly dark apically..... *1. I. fenestratus (Fabr.). *1. Llybius fenestratus (Fabr.). Fabricius, 1781, Spec. Ins., 1:294 (Dytiscus), Scholz, 1915, Ent. Blatt), X1:242; Gschwendtner, 1935:20; Csiki, 1946:659; Guignot, 1947:198; ab. aeneus Panzer, 1796, Ни. Germ. ХХХ У, 6. 16; ab. pir els clo mia Mannerheim, 1821, in Hummel, Essais Ent., 1:21. Oblong-oval, strongly convex, slightly shining; reddish brown with light sides and a bronze sheen; sides rarely also dark (ab. aeneus Panz.) or whole dorsum more reddish (ab. prescotti Mnnh.); elytra with a small yellow spot near the lateral margin, behind the middle, and another spot near the apex. Venter almost mat. Lateral wings of metathorax narrow, tongue-shaped, about 5 times as long as broad, curved outward and ventrally. Claws of fore tarsi of male simple; outer claw slightly stronger, slightly truncate at the end; hind claws markedly different: outer claw broad, straight and blunt, markedly shorter than the inner; inner claw narrow and curved at the apex. Anal sternite with a distinct keel; numerous sharp wrinkles lateral to the keel; hind tarsi without a ridge on the ventral mar- gin. Anal sternite of female raised like a roof; triangular indentation more strongly marked than in the other species. Length 11.5—12 mm. Distribution. European USSR except in the south, Kirghizia, Siberia, Transbaikalia. West Europe except extreme south; North America. Common. = *2. Ilybius ater (Deg.). Degeer, 1774, Мета. Hist. Ins.,1V:401 (Dytiscus); Scholz, 1915, Ent. Blatt., X1:243; Gschwendtner, 1935:21; Csiki, 1946:660; Guignot, 1947:207. Oblong-oval, narrower posteriorly, strongly convex, almost mat, with a weak bronze sheen; sides of pronotum and elytra more or less red; a small reddish spot near the lateral margin behind the middle. Lateral wings of metathorax broad. Fore claws of male slightly different; inner claw broad, outer claw slightly shorter, with a weak, broad indentation in the basal half; both claws curved at the apex; hind claws pointed; outer hind claw markedly shorter, more strongly curved at the end; anal sternite with a short, sharp, 296 279 terminal keel, flanked by weak, short wrinkles; hind tarsi with a ridge at the outer margin. Hind claws of female pointed, outer claw shorter and strongly curved at the end; anal sternite moderately raised in form ofa roof at the end; middle of anal sternite smooth, shining, apparently keeled. Length 13—14 mm. Distribution. European USSR, Transcaucasia, Siberia. Northern and Central Europe; North America. Common. *3. Ilybius crassus Thoms. CAG thomson, W854, Sv. Vet: Ak. Bandit :224; ‘Scholz, 1915, Ent. Blatt.: 243; Gschwendtner, 1935:23; Csiki, 1946:661. Broadly oval, strongly convex; posterior third of elytra sharply descending ventrally in side view; black, with a bronze sheen, rarely without sheen; sides of pronotum and elytra more or less reddish. Lateral wings of metathorax narrow, 2—2.5 times longer than broad. Fore claws of male of equal length; outer claw narrower, with irregular ventral margin; first 4 segments of hind tarsi witharim atthe aouter margin; hind claws аз inl.fenestratus; anal sternite without keel, with weak wrinkles. Length 10—11.5mm. Female. Anal sternite strongly incised, with transverse dashes lateral to the indentation. Distribution. North of European USSR, Siberia to the Far East. Northern Europe and mountains of Central Europe. *4, Ilybius poppiusi Zaitz. Zaitsev, 1906, Russkoe Entomologicheskoe obozrenie, VI:208; Zaitsev, 1910:24; Gschwendtner, 1935:28. Resembling I.crassus in the narrow lateral wings of the metathorax but differing in other characters. Regularly oval, strongly convex, black, with a weak bronze sheen. Fore claws of male similar, both with irregular ventral margin; hind claws long; outer claw broader, tapering only in the apical third, bluntly pointed, slightly shorter than the inner claw; anal sternite with a long, sharp keel flanked by numerous, strongly marked wrinkles; hind tarsi with a ridge at the ventral margin. In the female, wrinkles lateral to the rooflike elevation weaker but distinct. Length 10—11 mm. Distribution. Transbaikalia, Yakutia, Far East. Mongolia. *5. Llybius quadriguttatus Boisd. et Lac. Boisduval et Lacordaire, 1835, Fn. entom. Paris, 1:487; Guignot, 1947:198. — obscurus Marsham, 1802, Ent. Brit., 1:414; Scholz, Ent. Blatt. :243; Gschwendtner, 1935:24. Broadly oval, strongly convex; black, without bronze sheen; sides reddish brown; abdomen usually lighter. Lateral wings of metathorax broad. Male. 297 280 Anal sternite rcunded posteriorly, with a keel flanked by a few short wrinkles. Fore claws with a denticle in the middle; inner claw of the mid tarsi also sometimes with a small denticle; hind claws markedly different; outer hind claw much shorter. Female. Elytra usually with a strongly marked subapical indentation so that the apex forms a small beak. Length HORS НЮ ой Distribution. European USSR, except the steppe, Black Sea coast of Caucasus. Europe. Rather rare. *6. Ilybius similis Thoms. Thomson, 1854, Sv. Vet. Ak. Handl.:225; Scholz,1915, Ent. Blatt. :244; Gschwendtner, 1935:25; Guignot, 1947:199.— ovatus Hochhuth, 1871, Bull. Soc. Nat. Moscou, XLIV, 1:237. Closely resembling I.quadriguttatus and differing from it as follows: hind tarsi of male without a ridge at the ventral margin; keel on anal sternite longer and sharper, and wrinkles lateral to it numerous, long and strongly marked; hind claws less different; outer claw slightly shorter than the inner. Elytra of female with a hardly marked subapical inden- tation; network on anal sternite lateral to the middle less delicate than in I.quadriguttatus. Hind tibiae of both sexes coarsely punctate. Length 10), =i, матом. Distribution. North and middle belt of European USSR, to the Kiev Region in the south. Northern and Central Europe. Rare. *7. Ilybius subaeneus Er. Erichson, 1837, Kaf. Mk. Brndb., 1:156; Scholz, 1915, Ent. Blatt. :244; Gschwendtner, 1935:23; Csiki, 1946:661; Guignot, 1947:200; ab. rufi- ventris Sahlberg, 1873, Not. Sallsk. Fn. Fl. Fenn., XIV:167; Gschwendtner, 1. е,; var. Lap ponice us Scholz, 1917) mnt. Nutt. WV 2 oli заем, ви chalybeatus Sahlberg, 1873 (not Thoms.). Oval, broad, convex, slightly shining, black, with a strong bronze sheen; sides more or less reddish; venter reddish brown; abdomen sometimes brownish red (ab. rufiventris); Lateral wings of metathorax broad. Fore claws of male different; outer claw with an indentation before the middle, slightly broadened above the indentation; anal sternite with a weakly marked apical indentation, without keel, but with numerous, long, sharp wrinkles. Anal sternite of female slightly raised at the end, witha few weak wrinkles lateral to the middle. Length 10.5—11.5mm. Distribution. European USSR, Transcaucasia (plains), Siberia to Transbaikalia, Middle Asia. Northern and Central Europe; North America. Common, Ilybius subaeneus var. lapponicus Scholz. Smaller (8.5—10 mm), narrower, lighter; spots on elytra usually more distinct. Extreme north of Europe, mountains of Central Europe, mountains of Trans- caucasia. This is possibly a different species (I have not seen northern specimens of this form). 298 281 *8. Ilybius guttiger (Gyll.). Gyllenhal, 1808, Ins. Suec., 1499 (D ytiscus); Scholz, 1915, Ent. Blatt. : 245; Csiki, 1946:662; Guignot, 1947:202. Oblong- oval, slightly narrower posteriorly, moderately convex, black, without bronze sheen; sides sometimes slightly reddish; slightly shining; sculpture of elytra slightly more distinct than in langustior. Lateral wings of metathorax narrow. Fore claws of male simple and equal; hind claws distinctly different; inner claw long and pointed, outer claw much shorter, flat, broad and blunt; anal sternite with a sharp keel; lateral wrinkles weakly marked. Outer claw of thehindtarsi of female about half as long as the inner; middle of indentation with a blunt spine; anal sternite raised into a weak keel; wrinkles hardly marked. Length 9-10mm. Distribution. Northern and central belt of the European USSR. Northern and Central Europe. Common. *9. Ilybius angustior (Gyll.). Gyllenhal, 1808, Ins. suec., [:500 (D Vit 15245); 1560171965, Ent. Blatt. : 245; Gschwendtner, 1935:25. Oblong-oval; moderately convex, slightly shining, black, with a strong bronze sheen, often without sheen; sides sometimes reddish; last antennal segments usually black at the apex. Rows of dots of elytra weakly marked; dorsum with a distinct network. Fore claws of male similar, of equal length; hind claws distinctly different; inner claw long and pointed, outer claw much shorter and blunt, with a weak indentation at the ventral margin; keel of anal sternite long and sharp; wrinkles lateral to the keel strong, numerous, reaching to middle of sternite; hind tarsi with a thick ridge at the ventral margin. In the male, middle of indentation strongly projecting but there is no keel on the rooflike elevation; wrinkles weakly marked. Bengsth 9—9. 7mm. Distribution. North of the European USSR, northern Siberia, Trans- baikalia, Kamchatka. Northern and Central Europe; North America. *10. Ilybius obtusus Sharp. Sharp, 1880—1882:558; Zaitsev, 1910:25; Gschwendtner, 1935:28. More or less oval, broader anteriorly, very narrow posteriorly, slightly convex, Slightly shining; lateral ridge of pronotum broad and thick; black, with a slight bronze sheen. Rows of dots on elytra strongly impressed. Lateral wings of metathorax broad. Fore claws of male simple, of equal length; hind claws distinctly different; outer hind claw 0.75 times as long as the inner; anal sternite with a weak keel and numerous strong wrinkles lateral to the keel; hind tarsi with a ridge. Anal sternite of male strongly raised apically in form of a roof, with a shallow depression proximally; wrinkles numerous and weakly marked. Length 9-10 mm. Distribution. USSR: Transbaikalia, southern Yakutia. Mongolia. 299 *11. Tlybius aenescens Thoms. Thomson, 1870, Оризс. entom., П:175; Scholz, 1915, Ent. Blatt. :245; Gschwendtner, 1935:27; Csiki, 1946:662; Guignot, 1947:204. Oval, narrow, moderately convex, black, with a bronze sheen. Lateral wings of metathorax broad. Fore and hind claws as in Langustior; first 4 segments of hind tarsi with a thin ridge, their outer angles distinctly raised; keel of anal sternite short, in form of a small tubercle; wrinkles lateral to the keel hardly marked or absent. In the female, wrinkles hardly visible or absent; middle of indentation not projecting in form of a denticle. Length 8.5—9 mm. Distribution. Northern and central belt of the European USSR, West Siberia. Northern and Central Europe. *12. Llybius ovalis Gschw. Gschwendtner, 1934, Entom. Anz., XIV:74; idem, 1935:29. Female. Broadly oval, strongly convex, slightly shining, black, with a bronze sheen; last antennal segments dark at the apex. Dorsum witha coarse network and with a fine and more delicate network inside it which covers the whole elytra except the prescutellar space; sides of metathorax and hind coxae with coarse sculpture, almost mat; hind coxae also with irregular wrinkles. Lateral wings of metathorax broad. Outer hind claw slightly shorter than inner, its proximal third strongly curved; anal sternite slightly raised at the end in the form of a roof, but much lower than in I.obtusus; wrinkles numerous, strong. Elytra with a weak subapical indentation. Length 9mm. Male unknown. Distribution. East Siberia (this description is based on a single female from Mal'ta, near Irkutsk). *13. Ilybius fuliginosus (Fabr.). Fabricius, 1792, Ent. Syst., 1:191 (Dytiscus); Scholz,1915, Ent. Blatt. : 246; Gschwendtner, 1935:21; Csiki, 1946:660; Guignot, 1947:203; subsp. turkestanicus Gschwendtner, 1934, Entom. Anz., XIV:74; idem, 1935:21. Oblong-oval, narrow, slightly pointed posteriorly; slightly convex, brown, with a bronze sheen; sides with a brownish yellow border which is usually divided by a brown line which begins at the apex. Network on the elytra distinct. Lateral wings of metathorax broad. Fore claws of male long and different; outer claw with a slight indentation before the middle; hind claws long, narrow and pointed; anal sternite with a short keel at the apex, wrinkles distinct; hind tarsi with a ridge at the outer margin. In the female, apical triangular indentation of anal sternite deep, its middle projecting in form of a short spine. Length 10—11.2 mm. Distribution. European USSR, Siberia, Transcaucasia, Middle Asia. Western Europe, North Africa, North America. 300 282 13a. Llybius fuliginosus turkestanicus Gschw. Differing from the nominate subspecies as follows: smaller, shorter, rounded posteriorly, more convex; sculpture of dorsum more delicate; metathoracic wings broader; terminal spine of prothorax shorter; rooflike elevation at apex of anal sternite more vertical. Distribution. West China (Sinkiang). *14. Ilybius lateralis (Gebl.). Gebler, 1832, Nouv. Mém. Moscou, П:40 (Dytiscus); Sharp, 1880—1882: 762; Gschwendtner, 1935:30.— limbatus Sharp, 1880—1882:557; Seidlitz, 1887:98 (Agabidius). Oval, oblong, narrow, pointed posteriorly, weakly convex, reddish brown, with a bronze sheen; disc of pronotum more or less broadly dark; elytra blackish brown; yellow lateral border of elytra broad, indistinctly delimited onthe inner side, almost a third of the width of the elytra inthe anterior two- thirds; ittapers toward the apex and does not reach the suture inthe posterior half; itis divided by a usually blackish brown line, venter reddishbrown; prono- tum slightly rounded laterally, its posterior angles obtuse. Prothoracic process short and bluntly pointed. Lateral wings of metathorax narrow, tongue-shaped. Fore claws of male simple; hind claws short; outer claw slightly shorter than inner; anal sternite without keel or wrinkles; ridge at outer margin of hind tarsi hardly marked. In the female, indentation at apex of anal sternite hardly marked, flanked by a few large dots. Length 7.5—8.2 mm. Distribution. USSR: Transbaikalia, Maritime Territory. Northern Mongolia. *15. Dlybius apicalis Sharp. Sharp, 1873, Trans. Ent. Soc. London:51; idem, 1880—1882:561; Régimbart, 1899:289; ?Feng, 1933, Peking Nat. Hist. Bull.:115; Gschwendtiner;, 1935:30; Falkenstrom, 1936, Lingn.’ эс. Journ:, 15, №. 2:225.— ?intermediatus Feng, 1936, Peking nat. hist. Bull., 11:10. Oval, oblong, strongly narrowed posteriorly, almost flattened, reddish brown; pronotum, except the narrow lateral margin, and elytra dark brown, with a strong bronze sheen; sides with a yellowish red border which is narrow near the base and about 45 of the width of the elytra; it becomes broader toward the middle and narrows again further on; its inner margin distinctly delimited from the dark background; it projects inward in the form of denticles or processes of irregular.form near the apex; this border is longitudinally divided by a dark stripe of moniliform spots in the posterior 21 and does not reach the suture. Venter, antennae and legs reddish yellow; hind coxae darker. Sides of pronotum slightly rounded; posterior angles of pronotum almost rectangular. Prothoracic process laterally compressed, produced into a long spine. Lateral wings of meta- thorax long, tongue-shaped, very narrow. Fore claws of male short, of 301 283 almost equal length; inner claw slightly thicker and broader at the base; both claws curved after the basal third. Hind tarsi without ridge at the outer margin; posterior half of anal sternite with a distinct network of polygonal loops. Fore claws of female long, simple; anal sternite slightly raised at the apex, without indentation. Length 8.5—10 mm. Distribution, USSR: Amur Region, Maritime Territory. North China (Manchuria, Ordos). *16. Ilybius cinctus Sharp. Sharp, 1880—1882:560; Seidlitz, 1887:98 (Agabidius); Régimbart, 1899:289; Zaitsev, 1915:261; idem, 1927:28; Gschwendtner, 1935:31.— deplanatus Steven, 1829, Mus. hist. nat. Univ. Mosquens., 11:26 (Zaitsev, 1909, Russkoe Entomologicheskoe obozrenie, IX:407); (? var.) angustulus Régimbart,1899:289; Feng,1936,Peking Nat. Hist. Bull.,11:115; Gschwendtner, 1935:32.— ?chinensis Csiki, 1901, Asiat. Forsch., П:102; Feng, 1936, Peking Nat. Hist. Bull., П:115. Oval, oblong, narrower and smaller than I.apicalis; flat dorsally, shining, yellowish brown, with a strong bronze sheen; pronotum reddish brown onthe disc, with a reddish yellow lateral border; elytra brownish black; reddish yellow or yellow lateral border of the elytra almost equally broad throughout, Waals as wide as elytra, slightly broader in the middle, rarely divided in the posterior "Ig by a thin brown longitudinal line which does not reach the suture at the apex; lateral yellow window absent; the border projects inward near the apex in the form of short irregular denticles; rows of dots distinct. Venter and legs red. Sides of pronotum more distinctly rounded than in I.apicalis; posterior angles of pronotum obtuse. Lateral wings of metathorax narrow, tongue- shaped, but half as long and markedly broader than those in I.apicalis. Fore claws of male and anal sternite asin Lapicalis. Size and form of body very variable, body narrower or broader. Length 7.5—9.5mm. Distribution. Ciscaucasia (Stavropol), southeastern steppes of the European USSR and eastern Transcaucasia to Tiflis, Middle Asia. Mongolia, China (Sinkiang). I consider one specimen from East China (Hankow) and one from north- eastern China (Maimakai [Changshengtsun], Mukden [Liaonin] Province), as be- longing tothe species. They seemtobelongto Langustulus Rég. or I.chi- nensis Csiki. The two original specimens of I.angustulus (2 females from Szechwan) were sent to me by the author. They differ from Icinctus only in the weaker sheen on the dorsum; I cannot find other differences. I therefore consider ILangustulus asa variant of I cinctus or even as synonymous. I.chinensis may also be synonymous with I.cinctus, which is widely distributed in Middle Asia to the steppes of the European USSR. 30. Genus Colymbinectes Falk. Falkenstrom, 1936, Lingnan, Sc. Journ., 15, No. 1:97. Type species: Colymbinectes ater Falk. 302 Lateral wings of metathorax narrow, wedge-shaped. Hind femora with а group of short spinules in the outer apical angle; spinules situated ina linear depression. Hind tarsi short and relatively broad; ventral margin of outer half of hind tarsi produced posteriorly into lobes. Hind claws different; outer claw shorter. According to the description of the genus by Falkenstrom, this genus differs from Ilybius only in the broader hind tarsi; otherwise the description agrees with the characters of many species of Ilybius. a 1. Colymbinectes ater Falk. Falkenstrom, 1936, Lingnan Sc. Journ., 15, 1:97. Oval, oblong, tapering anteriorly and posteriorly; dorsum moderately convex, black, without metallic sheen, with two reddish yellow spots on the elytra (one near the lateral margin behind the middle and the other near the apex); antennae rust-red; fore and mid tarsi and last segment of hind tarsi reddish. Pronotum with a lateral ridge; sides of pronotum rounded and tapering anteriorly; posterior angles of pronotum almost rectangular. Prothorax sharply raised in form of a roof; prothoracic process broadly lanceolate, with a distinct rim, pointed. Lateral wings of metathorax long and narrow. Posterior half of anal sternite delicately, sparsely punctate. Sculpture of dorsum the same in both sexes, consisting of delicate, polygonal, slightly irregular loops; the cells contain one, rarely 2 or 3, small dots. Femora and tibiae of all legs and tarsi of hind legs thick. Claws of hind tarsi as in species of Ilybius. Fore claws of male different; inner claw slightly thicker and longer, curved at the base, straight further on and curved at the apex. | Length 11—I11.5 mm. Distribution. China (Szechwan). Gschwendtner (1939:26, nota) considers it as a species of Ilybius. 31. Genus Rhantus Lac. Lacordaire, 1835, Fn. Ent. Paris, [:309; Gschwendtner, 1935:1; Csiki, 1946:663; Guignot, 1947:215. DByperspecies,;, Diytisicusmexohetus Rorst: Medium-sized, slightly convex; dorsum with a dense, delicate network which is rarely coarser. Pronotum with a more or less distinct rim at the lateral margin. Prothoracic process lanceolate. Abdominal sternites 4—5 with a group of long, dense hairs in the middle. Hind femora without group of setae near the inner apical angle. Last segment of hind tarsi not longer or slightly longer than penultimate segment; hind claws different; outer claw much shorter than inner. Fore and mid tarsi of male with adhesive pads ventrally. Penis of most species symmetrical, slightly asymmetrical in a few species; both parameres similar. 303 The genus contains 82 species in all zoogeographical regions and is divided into 3 subgenera (2 subgenera in the Palearctic Region). The species occur in small, shallow, stagnant water bodies overgrown with vegetation, in cold and temperate regions; the species of this genus occur only in the highlands in the Tropics. They kill mosquito larvae. Key to Species 1 (32). Base of pronotum straight or with a slight indentation before the posterior angles, not produced posteriorly. Elytra reddish yellow to yellow, with more or less dense black speckles; speckles almost EOSIN shay GOUNG GOCSISS’ ais oho ws G Sons (1. Subgenus Rhantus s. str.). 2 (11). Prothorax completely or partly black. 3 (8). Whole prothorax black. Lateral rim of pronotum thin or absent anteriorly. 4 (7). Larger (10.5-12.5mm). Elytra usually pointed posteriorly. Black area before eyes narrow. Black spot on disc of pronotum short, transverse or rounded-oval, small, rarely absent. Body oblong-oval, usually distinctly broader in the middle or behind the middle. 5 (6). Yellow spot on vertex narrow, long, bilobed. Speckles on elytra larger than intervals between them; sculpture at apex of elytra distinct. Fore claws of male slightly curved near the base, Siicaniciat tuirthere Oly) eae *1. Rh. (s. str.) pulverosus (Steph.). 6 (5). Yellow spot on vertex broad, oval, shorter laterally. Speckles on elytra smaller than intervals between them; network at apex of elytra more delicate; elytra more shining. Claws of male simple, siieloulhy COREE 5 oo Golo de wees 2. Rh. (s. str.) sikkimensis Rég. 7 (4), Smaller (10—10.5mm), shorter; elytra slightly rounded posteriorly. Black area before eyes broad; yellow border at anterior margin of head usually much narrower than in related species; spot on vertex connected with the yellow border small, trilobed. Black transverse stripe on disc of pronotum broad, distinct. ....... RPM UR OMEN Sure А ао ОН 3. Rh. (s. str.) ovalis Gschw. 8 (3). Only prothoracic process or also a small adjacent part of pronotum black. Lateral rim of pronotum extending to the anterior angle. 9 (10). Disc of pronotum with a dark oval spot which is sometimes laterally produced into short, narrow processes, sometimes reaching the black posterior margin.... 4. Rh. (3. str.) aequimarginatus Falk. 10 (9). Pronotum without dark spot on the disc. Speckles on elytra very smalls Е ука therehore appearing Пе Е о 5. ВН. (3. str.) regimbarti Jak. ). Prothorax completely yellow. ). Pronotum with a dark spot on disc. ) ) 285 Smaller (7—11 п). Dorsum shining. Elytra with 3 or 4 longitudinal yellow lines of different length which contrast distinctly to the background of black speckles. Abdo- minal sternites) more ог less yellowsiste we aio eae еее о ое ЖВЬ. (3. str.) notatus (Fabr.). 304 286 Elytra without yellow longitudinal lines; abdomen black ....... оне. *7. Rh. (3. str.) notaticollis Aubé. Larger (13—14mm). Dorsum with a coarse network, almost mat. Spot on disc of pronotum rounded, small. Claws of fore tarsi of male with a blunt denticle at the base. Dorsum with the same coarse network in both sexes... 8. Rh. (s. str.) yessoensis Sharp. Spot on disc of pronotum large, transverse. Fore claws of male Simple. sVOEsumMmPOnhemalewathscoarser sculpture “S29. 2 Mies. MLE STAIN cm Re ccote Was flew toy fap, os Yes 5% 9. Rh. ($. str.) erraticus Sharp. Pronotum without spot on the disc. Venter black in its greater part. Lateral wings of metathorax broad. Body more oblong, narrower. Whole ventral side (except prothorax) black, only posterior margin of sternites reddish. Middle of base of pronotum with a broad black border. Speckles of elytra larger ANG ‘Ченеек - a.) «мови, *10. Rh. (s. str.) suturellus (Harr.). Body shorter, markedly broader posteriorly. First abdominal sternite and posterior margin of the other sternites more or less yellow. Pronotum with a narrow black border at the base which is sometimes indistinct or absent. Speckles smaller and elytra theneroretapparentlyaghtersg tims ae oe ee yee АИ ee ME ES NAT, Дек ИХ, *11. Rh. (s. str.) bistriatus (Brgstr.). Venter uniformly reddish yellow. Lateral wings of metathorax narrow. Smaller (9—1lmm). Elytra rarely with distinct, yellow, longi- tudinal lines. Speckles on elytra fused in some places; elytra darker. Head with two dark triangular spots between the eyes; head slightly convex, narrower. Pronotum uniformly yellow; sometimes with a more or less marked dark stripe in the middle of the base. Fore tarsi of male more distinctly laterally compressed; claws of fore tarsi as long as the last 3 tarsal segments together, of equal length, straight ...... И По *12. Rh. (в. str.) exoletus (Когз+.). Middle of base of pronotum always with a black stripe which is slightly curved anteriorly at the sides. Fore claws of male less laterally compressed, of almost equal length, short, not longer than last segment, slightly curved ....*13. Rh. (5. str.) latitans Sharp. Head only with a narrow curved black stripe between the eyes, strongly convex, strongly narrowed anteriorly and posteriorly... ACE Le PA RR EE RE De A Ca 14. Rh. (s. str.) incognitus Scholz. Speckles on elytra isolated, sparse, often very small or hardly visible. Dorsum light to, almost,uniformly,-y ellows, в. wemere И и а. *15. Rh. (3. г.) rufus Zimm. Larger (11.5—13 mm). Body broad, flat. Elytra usually with distinet, tongutudinall, vellow limes iain slimes Юль ce ie apd aA C supe Se Un) tog. ee UM И gee *16. Rh. (s. str.) consputus (Sturm). Base of pronotum with a deep indentation near the posterior angles. Dorsum uniformly black, slightly lighter laterally; elytra black, without speckles... (2...subpenus, „Маю tise aa tz) us een ae apy ee en Edi RN SOSA NN SI Se A *17. Rh. (Nartus) grapei (Gyll.). 305 Key to Larvae of Rhantus Lac. 1 (2). Head! lance; we enciishogile veneers ile *11. Rh. bistriatus (Brgstr.). 2 (1). Head normal; cerci long or moderately long, longer than last segment. 3. (4) 4; .Genciumoderately Шей. sont uses *1. Rh. pulverosus (Steph.). и (3). 0 Ceceiwlons. 5 (6). | Yellowish) black wwithayeoldenyinideseenceneiel-)-lerrie me) mene И *12. Rh. exoletus (Forst.). 6 (5) Oliivie-browniq: Java «emake cmb Meme iene wee Rh. suturalis Leay. 1. Subgenus Rhantus s.str. Туре species: Dytiscus exoletus, Horst. Base of pronotum straight or with a weak indentation. Elytra reddish yellow, with black speckles. 287 *1. Rhantus (s. str.) pulverosus (Steph.). Stephens, 1828, III. Brit. 11:69 (Dytiscus); Sharp, 1880—1882:609; Guignot, 1947:209.— punctatus Fourcroy, 1785, Entom. Paris, I:70; Gschwendtner, 1935:372; idem, 1936:3; ab. ruficollis Schilsky, 1908, Deutsch. Ent. Zeitschr.:600; ab. flaviventris Schilsky, 1908, ibid. — vibicicollis Hochhuth, 1846, Enum. Carab. Hydroc. Cauc. :216. Oval, slightly oblong, slightly convex, shining, reddish yellow; anterior and posterior margin of pronotum usually with a narrow brown border; spot on disc transverse, short, rarely more or less reduced (ab. rufi- collis); elytra with small, dense, black speckles on the whole surface except in a narrow lateral field at the base and on the presutural stripe; speckles denser near the presutural stripe and in the region of the two rows of dots; speckles sometimes forming a small rounded spot near the apex. Venter completely black; antennae, fore- and midlegs and epipleura reddish yellow; abdomen sometimes slightly reddish (ab. flaviventris). Fore and mid tarsi of male slightly broadened and laterally compressed; fore claws short, distinctly different; inner claw longer by a third than outer claw, very thick at the base; outer claw less thick; both claws curved near the base, straight further on; claws of midlegs slightly longer, almost equal. Anal sternite with short, weakly marked wrinkles at the apex. Wrinkles more distinct in the female. Lateral wings of metathorax short and broad. Rows of dots of elytra not strongly impressed. Length 10.5—12.5mm. Distribution. Central and southern belt of European USSR, Trans- caucasia, Middle Asia, Maritime Territory. Southern Europe and Central Europe, Mediterranean, Himalayas, Korea, Japan, Australia, Polynesia. 2. Rhantus (s. str.) sikkimensis Rég. Régimbart, 1899:306; Gschwendtner, 1935, Rec. Ins. Mus., XXXVII, р. 1: 382% ‘тетя, 19'36:22:11939:25% 306 288 Closely related to Rh.pulverosus, but narrower and lighter, speckles on elytra much smaller, smaller than the intervals between them. Yellow spot on vertex always of different form; broadly oval, almost rounded, not bilobed. Elytra with a strong sheen, sculpture less marked near the apex. Fourth segment of hind tarsi of male produced posteriorly at the ventral outer angle; claws of fore tarsi simple, of almost equal length; male genitalia also distinctly different. Length 10.5—-11.5mm. Distribution. India (Himalayas), China (Szechwan, Yunnan). 3. Rhantus (s. str.) ovalis Gschw. Gschwendiner, 1935, Rec. Ind. Mus., ХХХУП, р. Ш:371; idem, 1936:20. — friedrichi Falkenstrom, 1936, Lingn. Sc. Journ., 15:227. Oblong-oval, usually slightly broadened behind the middle; strongly shining; head and pronotum slightly mat because of the strongly marked, dense network; elytra with a more delicate network which consists of broader loops; background inside the loops with isolated dots and witha fine secondary network which is more marked posteriorly but not as thick as the coarse primary network (not as inRh.pulverosus where the primary and secondary networks are incised to the same extent near the apex). Rows of dots on elytra regular and with isolated dots (which is not the case in Rh.pulverosus). This species is especially characterized by the pattern of the head. The only yellow parts are the clypeus anda narrow adjacent part of the frons behind the frontal pits; black field before the eyes therefore broad; yellow spot on the vertex smaller than in the other species, slightly broadened laterally, slightly trilobed. Transverse stripe on disc of pronotum broad, sharply delimited, sometimes with a dark border at the anterior and posterior margin. Speckles on elytra isolated; the following areas reddish yellow: base of the elytra, sides and sutural line, sometimes also 2 additional longitudinal lines in the anterior half. Venter black; prothorax sometimes red, like posterior margin of abdo- minal sternites 3—5. First 3 segments of the fore and mid tarsi of male slightly broadened and laterally compressed; claws almost equal, simple. Anal sternite without wrinkles in both sexes. Length 10—10.5 mm (after Gschwendtner). Distribution. Northern India, China (Yunnan). According to Gschwendtner (1 939), Rh.friedrichi Falk,, which was described from one female from Szechwan, belongs to this species. 4. Rhantus (5. str.) aequimarginatus Falk. Falkenstr6m, 1936, Lingn. Sc. Journ., 15:232; Gschwendtner, 1939:25. This species and Rh.regimbarti belong to the group of Rh. pul- verosus; unlike in the other related species, lateral ridge of pronotum not indistinct anteriorly, but reaching the anterior angle; however, dark spot on pronotum absent and speckles on the elytra very small and scattered inRh.regimbarti, so that the coloration of the elytra is light, not 307 289 asin Rh.aequimarginatus, where the black color predominates and the large speckles are fused into serpentine spots in some places, and the yellow background is strongly reduced. Median spot of pronotum oval, produced laterally into a short narrow stripe, often greatly expanded and fused with the narrow black posterior margin, often also produced anteriorly, almost reaching the anterior margin. On the other hand, pro- thorax and trochanters lighter, reddish; posterior margin of abdominal sternites 3—5 yellow in a large part; forelegs yellow, base of femora dark; femora and tibiae of midlegs very dark; hind legs pitch brown. Rows of dots on elytra weakly marked, with fine dots arranged in groups. Last tarsal segment of forelegs of male distinctly longer than the preceding 3 segments together; both fore claws curved at the base, straight further on; penis thicker at the base, more curved toward the apex than in the pre- ceding species; parameres with long hairs. Length 11—12.5 тата (after Falkenstrom). Distribution. China (widely distributed in Szechwan and Central China). 5. Rhantus (s. str.) regimbarti Jak. Yakovlev, 1896, Trudy Russkogo Entomologicheskogo obshchestva, ХХХ:182; Feng, 1933, Peking, Nat. Hist. Bull. :117; Gschwendtner, 1936:23.— sharpi Yakovlev, 1896, ibid. :182. This species differs from Rh.pulverosus in the much lighter coloration of the elytra and the absence of a dark spot on the pronotum which is also broader; lateral ridge of pronotum distinct anteriorly; speckles on elytra much smaller, more scattered, not fused; yellow longi- tudinal lines sometimes present; prothoracic process, sometimes also whole prothorax in a greater or smaller part, and spot in middle of metathorax, broad band in middle of first abdominal sternite and sides of following abdominal sternites, and posterior half of anal sternite, reddish yellow; base of hind femora and hind tibiae dark. Rows of dots on elytra strongly marked. Claws of fore tarsi of male different; inner claw more curved, slightly thickened in the middle, outer claw simple, shorter, more delicate. Зена Зо 5-е) аа Distribution. China (Sinkiang), Mongolia. *6. Rhantus (s. str.) notatus (Fabr.). Fabricius, 1781, Spec. Ins., 1:296 (Dytiscus); Scholz, 1927, Col. Centralbl.:141; Gschwendtner, 1936:6; Csiki, 1947:666; Guignot, 1947:210. — suturalis Lacordaire, 1835, Fn. Entom. Fr.,1:311; ab. female virgu-— latus M[liger, 1806, Mag. Ins., V:225; ab. semicirculatus О. Schneider, 1898, Abh. naturf. Ver. Bremen, XVI:51; Csiki, 1947 ibid. Closely related to Rh.notaticollis Aubé, differing from it as follows: coloration lighter, punctation on head more distinct, lateral ridge on pro- notum almost absent; black stripe at base of pronotum broader, sometimes 308 290 with processes which may be connected with the median spot, so that nearly a black half circle is formed (ab. semicirculatus). Rows of dots on elytra less marked, almost absent in the posterior half; speckles divided by yellow spots: a short oblique spot near the scutellum, two longitudinal spots on the disc and two oblique spots from the lateral margin inward; all these spots sometimes weakly marked, especially in the posterior half; lateral wings of metathorax narrow. Abdomen of male blackish brown; first sternite completely or almost completely yellow; sides and posterior margin of the other sternites and greater part of anal sternite yellow; fore and mid tarsi strongly broadened; fore claws markedly different; inner claw with a denticle at the base, much longer than the outer; anal sternite almost without wrinkles. Abdomen of female yellow, only anterior margin of sternites with a narrow black stripe; a dark spot at the sides of all sternites except the first; anal sternite with weak wrinkles; sculpture of elytra as in the male, or elytra with deeply incised dashes (female of ab. virgulatus). Length 10.2—11 mm. у Distribution. European USSR, Transcaucasia, Siberia. Northern and Central Europe, North America. *7, Rhantus (s. str.) notaticollis Aubé. Aubé, 1836, Iron. Col., V:107; Scholz, 1927, Col. Centrabl. :140; Gschwendtner, 1936:5; Csiki, 1946:665; Guignot, 1947:209. Oblong-oval, shining; head and pronotum reddish yellow; head with a black pattern; pronotum with a black transverse spot on the disc anda narrow border at the anterior and posterior margin; elytra with black speckles which are usually dense, in some places fused into short longi- tudinal waves or denser, especially on the disc and along the distinct rows of dots; yellow longitudinal lines absent; prothorax, epipleura, antennae (except apex of last antennal segments) and fore- and midlegs reddish yellow; abdominal sternites black, their posterior margin red. Pronotum with a thick lateral ridge. Lateral wings of metathorax narrower than in Rh.pulverosus. Fore and mid tarsi of male laterally compressed, slightly broadened; fore claws slightly longer than pretarsus, their ventral margin with a weakly marked double indentation; inner claw slightly shorter than the outer, its apex more curved; anal sternite with distinct wrinkles in both sexes. Length 9.3—11 mm. Distribution. Northern and central belt of the European USSR, Siberia to Kamchatka. Northern and Central Europe, Mongolia. Common. 8. Rhantus (3. str.) yessoensis Sharp. Sharp, 1891, Entomologist, XXIV, Suppl. :6; Feng, 1933, Peking Nat. Hist. Bull. :119; Gschwendtner, 1936:18. The largest of the Palearctic species; broadly oval, markedly broadened behind the middle; epipleura gradually tapering posteriorly; their margins converge at the level of the end of the 4th sternite; dorsum more or less 309 291 reddish yellow; black spot оп disc of pronotum more rounded, its anterior and posterior margin with a black border; dark speckles on elytra small, dot-shaped, sometimes hardly marked, so that the elytra appears brown; sometimes 2 or 3 longitudinal yellow lines along the sutural line; venter blackish brown; epipleura yellow; prothoracic process often reddish brown; posterior margin of abdominal sternites 3—6 red; hind legs dark; fore- and midlegs reddish, or tibiae and tarsi of hind legs also dark. Network on elytra, head and pronotum consisting of deep wrinkles which form narrow loops in the anterior half; these loops contain a finer secondary network in the posterior half of the elytra; the dorsum appears therefore almost mat; rows of dots hardly visible. Lateral ridge of pronotum narrow but sharp. Lateral wings of metathorax broad. Fore tarsi of male markedly broadened; mid tarsi less broad and laterally compressed; fore claws with a blunt denticle at the base, distinctly different: inner claw almost as long as pre- tarsus, outer claw shorter by one fourth and more curved. Anal sternite with distinct wrinkles in both sexes. Length 13.5-14mm. This species is unknown to me. Distribution. Japan, China. 9. Rhantus (s. str.) erraticus Sharp. Sharp, 1884, Trans. Ent. Soc. London:446; Gschwendtner, 1936:19. Resembling Rh.yessoensis, but smaller; spot on disc of pronotum transverse, narrow; femora and the greater part of fore- and midlegs brown; hind legs darker. Fore and mid tarsi of male broadened; claws long, simple; dorsum of female with coarser sculpture than in the male, almost mat. Length 13—13.5mm. This species is unknown to me. ID) Hiss ie Hey wii, Wei, hoya *10. Rhantus (s. str.) suturellus (Нагг.). Harris, 1828, New Engl. Farmer, УП:164 (Dytiscus); Scholz, 1927, Col. Centralbl. :142; Gschwendtner, 1936:8; Csiki, 1946:666; Guignot, 1947:221; female ab. subopacus Mannerheim, 1853, Bull. Soc. Nat. Moscou, XXVI, [:157; Zaitsev, 1906, Russkoe Entomologicheskoe obozrenie, VI:175 (Ménétr. err. typ.!); idem, 1910:33; Gschwendtner, 1936:8. Oblong, oval, shining, reddish yellow; pronotum without spot on disc, with a narrow black border at the anterior margin and a broad stripe in middle of base; speckles on elytra large, dense, often fused; the elytra appear therefore dark; yellow longitudinal lines absent; venter black; prothorax, epipleura, posterior margin of sternites, antennae (except dark apex of last antennal segments) and legs reddish yellow. Lateral ridge on pronotum distinct. Rows of dots of elytra weakly marked. Lateral wings of metathorax narrow. Fore- and midlegs of male broadened, not laterally compressed; fore claws as long as pretarsus, equally long; outer claw slightly broadened in the basal third; anal sternite with wrinkles in the posterior half in both sexes; claws of midlegs distinctly different, outer clay 310 very short, knife-shaped, inner claw slightly curved. Dorsum of female with the same sculpture as in the male, or a greater or smaller part of the elytra between lateral margin and inner row of dots with a coarser network, forming 4—6 mat longitudinal stripes which rarely almost reach apex of elytra (ab. subopacus). Length 10—11 mm. Distribution. European USSR, Siberia. Northern, Central and partly southern Europe, North America. Common, *11. Rhantus (s. str.) bistriatus (Brgstr.). Bergstrasser, 1778, Nomencl. ins. Hanau, I:42 (Dyt iscus); Scholz, 1927, Col. Centrlbl.:143; Gschwendtner, 1936:9; Csiki, 1946:9; Guignot, 1947:212; ab. nigropunctatus Mochul'skii, 1860, Bull. Acad. Pétersb., 11:292; ab. torrei Guignot, 1935, Bull. Soc. Ent. Fr.:38 (not Aubé).— maculicollis Dalla Torre, 1877, Jahresber. Ver. Oesterr., VIII:62; ab. pallidivestis Fiori, 1914, Riv. col. ital., ХП:180; Guignot, 1947, ibid.; ab. simulator Scholz, 1927, ibid. Closely related to Rh.suturellus, but shorter, distinctly broader behind the middle; lateral ridge of pronotum reaching anterior margin; rows of dots on elytra more distinctly marked; network on elytra usually less marked; elytra therefore less mat near the apexthanin Rh.suturellus; speckles smaller, more isolated, elytra therefore appearing lighter; speckles sometimes denser near dots in rows, forming 2 longitudinal rows of dark spots (ab. nigropunctatus); sometimes weakly marked, yellow, longi- tudinal lines present. Venter black; the whole first abdominal sternite, posterior margin of other sternites, middle of sternites 2—3, posterior half of anal sternite more or less reddish yellow. Usually no black border in middle of base of pronotum; this border rarely more or less marked (ab. torrei); a dark spot on the disc inab. simulator. Fore and mid tarsi of male less broadened than in Rh.suturellus; fore claws different, inner claw as long as pretarsus, with a blunt denticle at the base; outer claw slightly longer than the inner; anal sternite with sharp wrinkles in both sexes. Sculpture of dorsum of female as in the male, or the elytra with slightly mat stripes (similar to those in Rh. suturellus ab. subopacus, but much less marked). Length 9-10 mm. Distribution. Central and southern belt of the European USSR, steppes of Siberia, Transbaikalia Northern and Central Europe, North America. 292 *12. Rhantus (s. str.) exoletus (Forst.). Forster, 1771, Nov. Spec. Ins.:57 (Dytiscus); Scholz, 1927, Col. Centralbl. :148; Gschwendtner, 1936:13; Csiki, 1946:668; Guignot, 1947:214; ab. insolatus Aubé, 1838, Spec. Col., VI:254; var. melanopterus Zetterstedty1829; bine Wappi:33115) \Scholz,1927)) ibid; Guignot, 1947, ibid; Gschwendtner, 1936, ibid. Oval, slightly oblong, narrow, slightly convex, reddish yellow; pronotum sometimes with a more or less broad black stripe in middle of base 311 and а row of dotlike spots at anterior margin (ab. insolatus); rarely а shadowlike transverse stripe on the disc; speckles large, fused, vermiform in some places, yellow longitudinal lines absent; dorsum uniformly black invar. melanopterus; only lateral margin of elytra yellow; venter, antennae (except apex of last antennal segments dark) and legs reddish yellow. Fore and mid tarsi of male markedly broadened; fore claws very long, as long as last 3 tarsal segments together, almost equal, straight; claws of midlegs of similar form but of different size: outer claw much longer and slightly broader than inner; anal sternite with distinct wrinkles in both sexes. Length 9—10 им. Distribution. European USSR (except in the south), Siberia to Yakutia and Transbaikalia. The record from Armenia needs confirmation. Europe. Common. *13. Rhantus (s. str.) latitans Sharp. Sharp, 1880—1882:621; Scholz, 1927, Col. Centralbl. :147; Gschwendtner, 1936:14; Csiki, 1946:669; Guignot, 1947:215. Closely resembling Rh.exoletus, but larger; a black stripe in middle of pronotum always present; anal sternite with weaker wrinkles; loops of network of elytra with distinct, shallow dots. This species is distinguished by the short fore claws which are shorter than the pretarsus; both claws of almost equal length, slightly thicker and curved at the base. Antennae often of uniform color, without dark apex of the last segments. Lateral ridge of pronotum always indistinct anteriorly. Length 10—11 mm. Distribution. European USSR, from Novgorod to the Kiev region; steppes of West Siberia. Central Europe. 14. Rhantus (5. str.) incognitus Scholz. Scholz, 1927, Col. Centralbl. :146; Gschwendtner, 1936:12. Broadly oval, almost equally tapering anteriorly and posteriorly; shining, reddish yellow; head black only on the vertex; a narrow, hardly noticeable curved line before this area; posterior margin of pronotum usually with a narrow border which is slightly broader in the middle; black speckles on the elytra large, fused; there are rarely weakly marked yellow longitudinal lines; whole venter, antennae and legs reddish yellow; sides of first ster- nite with an indistinct brown spot; apex of antennal segments slightly dark. Lateral ridge of pronotum thick; lateral wings of metathorax almost tongue- shaped. Sculpture of dorsum weaker than in the other Russian species of this genus. The original description and the interpretation of this species by Gschwendtner shows that this species differs from Rh.latitans only in minor characters: pattern on head reduced, body "broadly oval,'' black border at base of pronotum also reduced. The differential characters of the males are slightly more distinct: fore and mid tarsi markedly laterally compressed, narrow (slightly compressed and moderately broad in Rh.latitans); fore claws of equal length, almost as long as pretarsus; 312 293 inner claw with denticle at the base in Rh.latitans; anal sternite with strong wrinkles (wrinkles weak in Rh.latitans). Length 10mm. Distribution. Germany. This species is unknown to me; further study is needed to determine its status. *15. Rhantus ($. str.) rufus Zimm. Zimmermann, 1922, Notulae Entom., П:20; Gschwendtner, 1936:24; subsp. subparallelus Scholz, 1927, Col. Centralbl.:146; Gschwendtner, 1936, ibid. This species differs from the other Russian species of the genus in its coloration. Body ovoid, slightly convex, slightly shining, red with a slight brown tinge; sides of pronotum and elytra reddish yellow;speckles on elytra so weakly marked that they can be seen only with a magnifying lens; they hardly darken the background. Network on elytra consisting of dense irregular loops. Lateral wings of metathorax tongue-shaped. Fore and mid tarsi of male markedly broadened; fore claws long; inner claw slightly shorter than the outer, with a pointed denticle at the base; claws of midlegs short, of equallength, outer claw twice as broad as the inner. Length 10—11 п. This species is unknown to me. Distr ibiihon.., .Ussks) Altai: *15а. Rhantus ($. str.) rufus subparallelus Scholz. Gschwendtner, who apparently examined the type, gives the following distinguishing characters between Rh.subparallelus andRh.rufus: subparallelus isdarker, smaller (9 mm), narrow; its head shows traces of the usual pattern; black speckles on elytra distinct, dot-shaped anteriorly, fused in the posterior part in some places. Apex of last antennal segments dark. There are also differences in the form of the claws of the male: outer claw of fore tarsi shorter, more curved and narrower; inner claw almost straight; claws of mid tarsi very short, slightly different and slightly curved; anal sternite with distinct wrinkles. Distribution. This subspecies was described from a single (?) specimen from Narym. In East Siberia (according to the author). *16. Rhantus (s. str.) consputus (Sturm). Sturm, 1834, Deutsch. Ins., VIII:83 (Dyt аси 3) Scholz. 1927.-Gole Centralbl. :144; Gschwendtner, 1936:10; Csiki, 1946:668; Guignot, 1947:212.— luteicollis Gebler, 1848, Bull. Soc. Nat. Moscou, XXI, (3):72; Zaitsev, 1906, Russkoe Entomologicheskoe obozrenie, \У1:64; ab. dressleri Wanka, 1910, Wien, Entom. Zeitg., XXIX:148. Broadly oval, with markedly rounded sides; broadly rounded posteriorly, shining, slightly convex, reddish yellow; pronotum of uniform color, often 313 294 with a narrow border at anterior margin and base; scutellum often yellow; elytra light because the speckles are small, scattered, rarely fused in some places; speckles sometimes denser on the rows of dots, forming longi- tudinal rows of dark rounded spots; sometimes yellow longitudinal lines on the background of the speckles, like in Rh.notatus. Pronotum with a thick ridge; lateral wings tongue-shaped. Fore and mid tarsi of male markedly broadened; fore claws equal, slightly longer than the pretarsus; inner claw with a blunt denticle at the base; claws of mid tarsi almost equal (outer claw slightly longer and broader than inner). Anal sternite of both sexes with strong wrinkles. Elytra of females broader posteriorly; there are sometimes specimens with a coarser network on the elytra (as in Rh.suturellus ab. subopacus Mannh.). Very dark specimens occur: venter dark; border at anterior and posterior margin of pronotum broad; speckles on elytra often fused (ab. dressleri). Length 12—13 mm. Distribution. Mainly steppe belt of European USSR and Siberia to Transbaikalia, but rarely also further north (Novgorod, Yaroslavl and Saratov regions). Central and Eastern Europe. 2. Subgenus Nartus Zaitz. Zaitsev, 1907, Ezhegodnik Zoologicheskogo muzeya Akademii Nauk X1:103; Gschwendtner, 1936:25; Csiki, 1946:669; Guignot, 1947:215. — Colymbetes Thomson, 1860, Skand, Col., П:50 (not Clairv.).— Ranto- giton Des Gozis, 1910, Misc. Entom., XVIII, 12:6. Type species: Dytiscus grapei Gyll. Dorsum uniformly black, slightly lighter laterally, without speckles on elytra. Base of pronotum strongly indented laterally, before the pointed, posteriorly produced angles. Lateral ridge of pronotum thin. Sculpture of elytra as in species of Ilybius. This subgenus contains 2 species, one in the Palearctic and the other in the Nearctic Region. *17. Rhantus (Nartus) grapei (Gyll.). Gyllenhal, 1808, Ins. Suec., 1:505; Gschwendtner, 1936:25; Csiki, 1946:669; Guignot, 1947:215. Oblong-oval, strongly tapering posteriorly, slightly convex, slightly shining, black; lateral margin of pronotum and elytra red; venter black; prothoracic process and posterior margin of abdominal sternites 3—5, antennae and forelegs reddish; fore femora, mid- and hind legs blackish brown. Sides of pronotum markedly rounded; rows of dots on elytra strong; lateral wings of metathorax tongue-shaped. Fore and mid tarsi of male slightly broadened, strongly laterally compressed; fore claws equal, slightly longer than pretarsus; claws of midlegs different, outer claw less curved, slightly broadened. Anal sternite with a shallow pit flanked by distinct wrinkles which are weakly marked in the female. Length 10—11 mm. Distribution. European USSR, Black Sea coast of Caucasus (Anapa). Northern and Central Europe, Balkans. Rather rare. 314 295 32. Genus Colymbetes Clairv. Clairville, 1806, Ent. Helv., П:188 (Dyt iscus); Gschwendtner, 1936:28; Csiki, 1946:670; Guignot, 1947:217.— Cymatopterus Lacordaire, 1835, Fn. Ent. Paris:308; Seidlitz, 1887:103. Type species: Dytiscus striatus L. Medium-sized (10.5—20 mm), more or less dorsally flattened. Pronotum without lateral ridge. Elytra completely covered with undulate, weakly incised, thin dashes; intervals between dashes either smooth in both sexes or raised in form of ridges in the female; transverse dashes absent on the disc in some species, present only at the apex and laterally, completely absent in some species. Metathoracic process usually flat between mid coxae, rarely with a more or less short, narrow, longitudinal groove which is sometimes indistinct. Lateral wings of metathorax broadly triangular, not reaching epipleura. Hind femora without tuft of setae near the inner apical angle. Last segment of hind tarsi as long as the preceding segment or shorter. First 3 segments of fore and mid tarsi of male more or less broadened and with small pads in 4 transverse rows, except the first segment on which the pads are replaced by two rows of spinules; fore claws short, of almost equal length; 2nd abdominal sternite with a distinct, but sometimes hardly visible stridulatory apparatus at the posterior margin, lateral to the middle; this apparatus consists of 10—25 short, dense, longitudinal dashes (this stridulatory apparatus is situated at the base of the 3rd sternite inC.minimus Zaitz.). The larvae resemble those of the genus Rhantus: temporal angles rounded; mandibles short, broadened at the base, 2.5 times as long as broad, pointed; styles with distinct spinules at the ventral margin. Only the larva of C.fuscus has been described (Figure 55). The pupa has an anteriorly indented pronotum; abdomen narrower than in pupae of Rhantus; 8th abdominal segment triangular, pointed posteriorly; cerci cylindrical, strongly thickened in their first two-thirds, then tapering and curved inward. The genus contains 25 species distributed in the Holarctic and mainly in the Palearctic Region. FIGURE 55. Colymbe- tes fuscus L. Larva. Key to Species 1 (18). Elytra completely striated, with narrow, more or less deep, trans- verse, undulate dashes; intervals between dashes flat or raised (in form of ridges in females of other species). Fore and mid tarsi of male weakly laterally compressed, strongly broadened. 2 (5). Tarsi of male strongly broadened, without pads on the ventral side, only with 3 rows of transverse rows of apically broadened, dense setae; these setae are stuck together by a secretion of the insect. 315 5 (LD), WA (HA Ne 1 (5) 5917 Oblong; anterior and posterior margin of pronotum with a more ов esis; loicoeel ас к обоев *1. С. paykulli Er. Body markedly broadened in the middle; pronotum without border but with a black transverse stripe in the middle of disc ....... Hee AA Me Abe В SMOK aS nici, Beh *2. C.dahuricus Aubé. Tarsi of male strongly broadened, with 4 transverse rows of broad, rounded adhesive discs on the ventral side. Pronotum with sharply marked transverse black stripe in middle of disc. Stridulatory apparatus situated at posterior margin of 2nd abdominal sternite of male (lateral to the middle), weakly marked, consisting of short, dense and narrow ridges which are well visible only under high magnification. Metathorax with a long groovelike depression between the mid coxae which becomes gradually flat posteriorly. Intervals between undulate, strongly incised, transverse dashes on elytra of female raised like ridges; elytra therefore almost mat, at leastunanterior halt.) ‘Шагыек (16—18 ма), broade ta). 1 BS cy haa ec nA hic a ea ns BRS se ke Shr Me ial is 3 Wee rat *3. С. striatus (L.). Leo ancien ее che its Net sok eu Roun TemMen CSE ls 4. C.magnus Feng. Intervals between dashes almost as smooth in the female as in the male, or slightly raised. Smaller (14.5—16.5mm); narrower не о ее *5. С. Коеп1р1 Zaitz. Metathoracic process with а short pitlike depression between the mid coxae or flat. Legs uniformly light. Body narrower; pronotum narrow, less rounded laterally. Elytra of female normally with raised intervals in form of ridges; intervals rarely smooth as in the male (alo. binomials Omi) Е овен *6, С. dolabratus (Payk.). Femora of mid- and hind legs with a dark longitudinal streak in the middle. Body broader, especially in the middle. Pronotum broad; sides of pronotum more rounded in the anterior third. Intervals on elytra smooth and flat in both sexes ...... wt. С. toll Zatz. Disc and sometimes also anterior and posterior margin of pro- notum with a more or less distinct dark area; if the transverse dark stripe on the disc is present, its outline is diffuse. Second abdominal sternite of male with a well marked stridulatory apparatus at the posterior margin, on each side of the middle, which is visible under low magnification. Stridulatory apparatus consisting of 15—20 strong, long, longitudinal, incised dashes; intervals between middle dashes broad, ridgelike р *8. C.fuscus (L.). Dashes of stridulatory apparatus shorter, 20—25 or more, more densely arranged; intervals between them narrow. Larger (15.5—16.5 mm), broader. Pronotum broad, more strongly tapering anteriorly. Intervals between rows on elytra flat in both еже; GOrsummaysin imino ен. *9, С. semenovi Jak. Slightly smaller (15—16mm), narrower. Pronotum markedly narrower, its sides less rounded. Intervals on elytra slightly raised in both sexes; dorsum therefore less shining ......... а о ее AV esti cient Remsen eae 10. C.tschitscherini Jak. 316 18 (1). Elytra with only isolated, short, transverse dashes which are some- times fused into short undulate lines in some places. Fore and mid tarsi of male moderately broadened, strongly laterally compressed. 19 (20). Smaller (10.5—11 тт). Stridulatory apparatus situated not at POSterior mMaTreinoOf 2nd but at Базе ot ord sternite! еее 3 Oo Gara dad Get of ое ss ad 11. C.minimus Zaitz. 20 (19). Larger (15mm). Stridulatory apparatus situated at posterior IMAG NTO риа текие и. со. ee tele s,s 12. C.vagans Sharp. *1. Colymbetes paykulli Er. Erichson, 1837, Kaf. Mk. Brandbg., [:149; Gschwendtner, 1936:33. Oblong-oval, slightly broadened behind the middle, markedly convex, shining, reddish brown; pronotum with a broad black border at anterior margin and base; both borders usually contiguous in middle of disc; sides of elytra lighter; venter blackish brown; legs lighter; basal segments of antennae reddish yellow. Pronotum strongly tapering anteriorly, with rounded sides and almost rectangular posterior angles. Transverse dashes on elytra of female deeply incised, intervals between them slightly raised; usual rows of dots distinct, weak, twisted, longitudinal superficial lines between them. First 3 segments of fore and mid tarsi of male strongly broadened, not laterally compressed, their ventral side with a dense brush of short setae; stridulatory apparatus situated at posterior margin of 2nd abdominal sternite, consisting of numerous, short, dense, deeply incised dashes. Length 17—19 м. Distribution. European USSR, West Siberia. Northern and Central Europe, North America. *2. Colymbetes dahuricus Aubé. Aubé, 1836, Icon. Col., V:99; Gschwendtner, 1922, Wien. Ent. Zeitg., XXXIX:93; idem, 1936:34.— obscuratus Mannerheim, 1853, Bull. Soc. Nat. Moscou, XXVI, [Ш:154. Closely related to C.paykulli, differing from it as follows: body strongly broadened in the middle or behind the middle, tapering like a wedge posteriorly; sides of pronotum more rounded; pronotum broadest near the slightly rounded posterior angles. Pronotum reddish, often with a broad, transverse, diffuse spot on the disc; pronotum sometimes dark, leaving only a narrow lateral, yellow border; anterior and posterior margin without border. Sculpture of elytra of male as in C.paykulli; dashes deeper in the female, intervals between them markedly raised; elytra therefore less shining. Fore and mid tarsi of male less laterally compressed, broader than in C.paykulli. Length 18—19.5 mm, Distribution. USSR: East Siberia to Kolyma, Kamchatka and Mari- time Territory. Alaska. 317 298 ж3. Colymbetes striatus (L.). Linnaeus, 1758, Syst. Nat., ed. 10, 1:411 (Dytiscus); Gschwendtner, 1936:35; Csiki, 1946:671; Guignot, 1947:218. Oblong, narrow, slightly broadened in the middle, shining, brownish yellow; pronotum with well delimited, transverse, black stripe on the disc; elytra brown, lighter laterally; venter black; posterior margin of sternites reddish. Sides of pronotum slightly rounded, slightly tapering anteriorly. Trans- verse lines on elytra of male deeply incised; intervals between them almost flat; these lines form grooves in the female, and the intervals between form ridges; however, all these structures are leveled down toward the apex, so that the elytra of females appear mat with a silky sheen. Usual rows of dots not very distinct. Process of metathorax characteristic, narrower than in the other species, with a groovelike depression in which the apex of the prothoracic process is situated; the flat end of the process almost reaches the apex of the mid coxae. Fore and mid tarsi of male strongly broadened, with 4 rows of rounded pads ventrally; stridulatory apparatus weakly marked. Length 16—18 mm. Ihave examined a large series of specimens from the Kalinin Region (Bologoe) which contains an aberrant female in which the elytra have the same sculpture аз the male (i. e., elytra smooth). Distribution. European USSR, Siberia, Northern Europe and partly Central Europe. 4. Colymbetes magnus Feng. Beng, 1936, Ректиз nat. hist. bull d= 2Gsichwendinen 939326: Large, closely related to C.striatus L. Dorsum yellowish brown; vertex black; pronotum with a black, transverse stripe on the disc, but without dark area at the anterior and posterior margin; disc of elytra brownish. Head with irregular dots; pronotum with coarse dashes and with a delicate network between them; elytra with strong, transverse, undulate lines. Fore tarsi of male with 22 pads; mid tarsi with 16 pads. Length 19 mm. Distrib wt von.) @hinay(wientsim): *5. Colymbetes koenigi Zaitz. Zaitsev, 1927:30; Gschwendtner, 1936:36. Resembling C.dolabratus Payk., but more closely related to C.striatus L. from which it differs as follows: body narrower, sculpture of pronotum more delicate; femora of mid- and hind legs (sometimes also of forelegs) not uniformly light, but with a dark longitudinal streak in the middle; sculpture of elytra almost the same in both sexes: transverse line not deeply incised and intervals only slightly raised. This species resembles C.dolabratus in other characters (metathoracic process the same). Length 14.5—16.6mm. Distribution. Highlands of Lesser Caucasus; northeastern Turkey. 318 *6. Colymbetes dolabratus (Payk.). Paykull, 1798, Fn. Suec., 1:204 (Dytiscus); Sharp, 1880—1882:628; Gschwendtner, 1936:36; subsp. groenlandicus Aubé, 1838, Spec. Col., VI:233; Sharp, 1880—1882:627; Gschwendtner, 1936:36; subsp. thomsoni Sharp, 1880—1882:628; Gschwendtner, 1936:36. Closely related to C.striatus L., but metathoracic process very narrow; groovelike depression shorter and more flattened; body narrower; posterior angles of pronotum more distinctly rounded; wrinkles on disc not con- verging like rays to a central point (as in C. striatus) but scattered. Sculpture of elytra of female of the principal form sharply different from that of the male (as in C.striatus). Length 14—17 пит. Distribution. Circumpolar, Arctic species; represented by sub- species thomsoni in Ireland and subspecies groenlandicus in Green- land. Only the principal form occurs in the USSR, in the Eurasian tundra. 6a. Colymbetes dolabratus groenlandicus Aubé. Sculpture of elytra almost the same in both sexes (intervals slightly raised); sculpture of pronotum weak: wrinkles slightly marked in the male, even less marked in the female. Distribution. Greenland. 6b. Colymbetes dolabratus thomsoni Sharp. In the sculpture of pronotum and elytra, this form is intermediate between the principal form and C.d.groenlandicus. Disterbutron.. Iceland. ж7. Colymbetes tolli Zaitz. (Figure 56). Zaitsev, 1910:33; Gschwendtner, 1936:37. This species is intermediate between C.striatus and C.dolabratus. It differs from the latter in the broader body (especially in the middle) and in the broad pronotum; sides of pronotum more rounded in the anterior third. It differs from both the above species in the dark mid and hind femora. It is probably more closely related to C.striatus; how- ever, the sculpture of the pronotum is finer, wrinkles FIGURE 56. Colymbe- more numerous (especially laterally) and denser; tes tolli Zaitz. transverse lines on elytra of male less incised; inter- vals slightly more raised; female with almost the same smooth sculpture on the elytra as the male; head without dots, as in C.striatus, but with delicate wrinkles. Metathoracic process slightly broader than in C.striatus; depression short, pitlike. Length 16.5—18 mm. Distribution. USSR: East Siberia (Yakutsk, Amginskaya Sloboda, 3 specimens), apparently distributed in the taiga. 319 300 *8. Colymbetes fuscus (L.). Linnaeus, 1758, Syst. Nat., ed. 10, 1:411 (Dytiscus); Gschwendtner, 1936:38; Csiki, 1946:671; Guignot, 1947:219; (?) subsp. semirufus Zimmermann, 1921, Ent. Blatt., ХУП:42; Gschwendtner, 1936:39. Oval, slightly oblong, narrowing almost equally anteriorly and posteriorly, markedly shining. Pronotum reddish yellow; anterior and posterior margin of pronotum brownish black; large transverse stripe also brownish black, more or less diffuse and often in contact with the anterior and posterior border in the middle; elytra brownish, their base, sides and area along the suture yellowish; venter black; posterior margin of abdominal sternites reddish; legs reddish brown; femora darker. Transverse lines on elytra thin; intervals between them almost flat, the same in both sexes. Metathoracic process broad between mid coxae, with a pitlike depression. Stridulatory apparatus of male distinct, consisting of 15—20 long, strongly incised dashes dividing posterior margin of 2nd sternite on each side of the middle into broad ridges which are broader near the middle. Length 5-18) maya. Distribution. European USSR, to the Leningrad Region in the north (rare in the north), Armenia, Tomsk. Europe, Central and southern Europe. Asia Minor to Iran. The records from Middle Asia should be confirmed, as they may refer to C.semenovi. One female of the form semirufus Zimm. has been described from Sinai (this may be a subspecies or even a different species); it differs from the typical form in its smaller size, the light brown elytra and the small blackish spot and dashes near the apex; it also differs in the much finer and sparser punctation of the hind tibiae. Ecology. This species occurs in medium-sized and large water bodies to the Alpine zone. *9. Colymbetes semenovi Jak. Yakovlev, 1896, Trudy Russkogo Entomologicheskogo obshchestva, XXX:176; Gschwendtner, 1936:39.— kokujevi Yakovlev, 1. с. :180. Closely resembling C.fuscus; the only difference is the form of the stridulatory apparatus; this consists of short, (25 or more), less strongly incised dashes which stand close together, so that the intervals between them form only narrow ridges. Other differences are less marked: body not as regularly oval as in C.fuscus, it is narrower anteriorly than posteriorly; pronotum markedly narrower, head much smaller; intervals between transverse lines on the elytra completely flat in both sexes, sculpture of pronotum slightly more delicate, network finer and loops denser; usual rows of dots on elytra more distinct; dorsum usually lighter. Length 15—16.5 mm. Distribution. Middle Asia from Turkmenia to Sinkiang, steppes of Ciscaucasia and eastern Transcaucasia. 320 301 10. Colymbetes tschitscherini Jak. Yakovlev, 1896, Trudy Russkogo Entomologicheskogo obshchestva, XXX:177. Closely related to C.semenovi, but apparently a valid species. Slightly smaller, narrower, more oblong, less shining; stripe on disc of pronotum with more distinct margin; pronotum markedly narrower, particularly anteriorly; sides less rounded; transverse lines on elytra more deeply incised in both sexes; intervals between them, especially in the posterior half in the female markedly, but weakly, raised; elytra therefore less shining; dashes of stridulatory apparatus slightly more distinct and longer. Length 15—16 пм. This revised description is based on the original specimen (female) and on a second male of the same origin, from the collection of Semenov-Tyan- Shanskii. Distribution. West China (Sinkiang — Niya Oasis). 11. Colymbetes minimus Zaitz. Zaitsev, 1908, Ezhegodnik Zoologicheskogo muzeya Akademii Nauk, ХП:420; Feng, 1933, Peking Nat. Hist. Bull., 8, 2:119; Gschwendtner, 193 6:33. This species and C.vagans belong to а group in which the transverse lines on the elytra are moreor less reduced. Oblong-oval, slightly convex, slightly shining; dorsum reddish yellow; disc of pronotum with two well delimited reddish brown spots; venter black; abdominal sternites (from the 4th onward), rarely from the 3rd) and legs reddish yellow. Base of pronotum narrower than base of elytra; sides of pronotum slightly rounded; posterior angles of pronotum almost rectangular. Elytra with numerous more or less long, irregular, deep, transverse dashes (rudiments of the normal, undulate, transverse lines of the genus). Usual rows of dots well marked. Elytra with a marked subapical indentation; sutural angle pointed. The male of this species differs sharply from the other species in the position of the stridulatory apparatus: this is not situated at the posterior margin of the 2nd abdominal sternite but at the base of the 3rd, and consists of 25 thin, short dashes. Fore and mid tarsi of male moderately broadened. Length Ovo 11.0 mm, Distribution, China (Tibet), 12. Colymbetes vagans Sharp. Sharp, 1880—1882:630. This species is unknown to me. Sharp compares it with C.piceus Klug (from Sinai, also unknown to me); he states that this species has shorter and stronger legs than the other species of this group and a lighter coloration. Sculpture of elytra as in C.piceus Kl.; it consists ofa delicate polygonal network visible only under high magnification; there is 321 302 also fine punctation; dots denser behind middle of elytra in some places, and forming delicate, short, undulate lines and wrinkles, leaving a small space between suture and first row of dots free. Pronotum also markedly narrower than elytra. Length 15mm. Ви сетевом. кам. эн гана ID) Ne ть ра Netolitzky, 1911, Deutsch. Entom. Zeitschr.:278; Zimmermann, 1937, Arch. Naturg., 83 A,12:109; idem, 1930:4; Gschwendtner, 1937:1; Csiki, 1946:672; Guignot, 1947:220. Medium-sized or large. Scutellum free, completely visible. Prothorax uniformly broad, almost flat, not laterally compressed. Anterior margin of eyes without indentation. First 3 segments of fore tarsi of male markedly broadened and forming a large rounded or transverse oval plate with pads; this plate is convex dorsally and concave ventrally. Female often with accessory sculpture. Larva. Head flattened, produced into a neck posteriorly. Prothorax conical, strongly convex, with sloping sides and a constriction before the middle. Abdominal segments 7—8 with long hairs on both sides. Cerci short, styliform or absent. This subfamily contains the largest species of the family; it is distributed in all zoogeographical regions and is divided into five tribes. Key to Tribes 1 (6). Ventral margin of first 4 segments of hind tarsi more or less strongly indented, covered completely with short, flat, adpressed, golden-yellow setae. 2 (3). Prothoracic process pointed at the end. Pronotum with a small Lape mailing ey ее leu reveal «Me aria oseteas 11. Tribe Eretini. 3 (2). Prothoracic process rounded at the end. Pronotum without lateral ridge. 4 (5). Spur at end of hind tibiae pointed. Anterior outer margin of lateral WANTS OL аетапока вата е i о 12. Tribe Hydaticini. 5 (4). Spur at end of hind tibiae with blunt apex or more or less strongly jagged or with 2 short denticles. Anterior outer margin of lateral wings of metathorax strongly curved ....13. Tribe Thermonectini. 6 (1). Ventral margin of first 4 segments of hind tarsi without setae or with setae only in the outer apical angle. 7 (8). Hind tibiae narrow, longer than broad; outer terminal spur of hind tibiae not broader than inner spur. Adhesive disc of fore tarsi of male rounded, with 2 large suckers at the base and with numerous smallisuckersy, iy ead eye Sree о wee ee 8 14. Tribe Dytiscini. 8 (7). Hind tibiae almost as broad аз long; outer terminal spur strongly broadened in the basal half. Adhesive disc of male transverse or transversely oval, with 3 or 4 transverse rows of small suckers... Е и ane nom anon 15. Tribe Cybisterini. 322 ТТ. т Ье BRETINI Crotch, 1873, Trans. Amer. Ent. Soc., IV:386; Regimbart, 1895:4; Gschwendtner, 1937:2. This tribe contains only one genus. 33. Genus Eretes Cast. Castelnau, 1833, Ann. Soc. Entom. Fr., П:397; Gschwendtner, 1937:2; Guignot, 1947:222. Туре зреслтез уст ся 5 stietrcu's I: Antennae thin from segment 5 onward. Prothoracic process with a spine; at the end; lateral wings of metathorax very narrow, their apex ending (303) 303 FIGURE 57. Larva. Еее оси $ № much before the epipleura. Pronotum trapezoidal, flat (like whole dorsal side of body); sides of pronotum with a rim. Elytra broadened posteriorly; sutural angle slightly produced posteriorly at the apex. Claws of hind legs almost straight, of slightly different length. Fore femora of male slightly thickened and curved; first 3 segments broadened into an adhesive disc, with numerous adhesive setae and with 2 large adhesive plates. The larva of E.sticticus L. has been described (Figure 57). The genus contains only 2 species; one of them distributed throughout the Tropics, but reaching the south of the Palearctic Region. 1. Eretes sticticus (L.) Linnaeus, 1767, Syst. Nat., ed. 12,1, 2:666 (Dytiscus); Gschwendtner, 1937:2; Csiki, 1946:675; Guignot, 1947:217; ab. griseus Fabricius, 1781, Spec. Ins., 1:293; subsp. helvolus Klug, 1834, Symb. Phys., IV, {. 33, f.3; subsp. Ssuccinctus Klug, 1834, ibid., f. 4. Oblong; narrowly or broadly oval; narrower anteriorly, moderately shining; dorsum with dense, fine punctation and a delicate network; pronotum with irregular 328 wrinkles and with moderately dense dots which are larger laterally; elytra with strongly impressed, scattered, black dots which are denser posteriorly; elytra with the three usual longitudinal rows of dots, the outer row often indistinct and very short. Dorsum straw yellow; black pattern very variable: in typical specimens, head with a double spot on the vertex, and a transverse spot anterior to this spot; pronotum with an undulate band on the disc, which is sometimes divided into spots; all 3 rows of dots on the elytra consist of small groups of black dots which form rows of dark spots; there is alsoa black spot near the middle of the lateral margin and another spot nearer the apex, also near the lateral margin; there is frequently a more or less marked black band behind the middle; band on elytra sometimes more sharply delimited, very broad, but a transverse stripe on pronotum absent; posterior angles of pronotum not rounded and sides straight — subsp. suc - cinetus Kl.; frontal spot often rectangular or heart-shaped; stripe on dise of pronotum sometimes short or absent; band on elytra weakly marked or absent; pronotum longer, with pointed posterior angles — subsp. hel- volus К!.; frontal spot sometimes reduced, stripe on disc of pronotum interrupted in the middle — ab. griseus Е. Elytra of female with an oblong depression near the middle of the lateral margin, which bears a black spot; sides of pronotum more rounded than in the male. Length 10—17mm. Male. First 3 segments broadened into a rounded plate with 2 large suckers ventrally and 220—230 very small suckers. Distribution. Crimea, south of the European USSR: (Saratov, Northern Caucasus), Transcaucasia, Middle Asia, Maritime Territory. 304 Southern Europe, Tropics and Subtropics. This species varies markedly in all respects. The varieties mentioned above are not distinctly separated geographically; thus,ab. griseus has been found only in France; subsp. succinctus Kl. has been found in North Africa; subsp. helvolus Kl. is more widely distributed, it occurs in the Canary Islands, Senegal, Transcaucasia, Crimea, Asia, (Iran, China), Mexico. 1A, APienlos Jah Ve 1D) AV AP CC ТА Sharp, 1880—1882:647; Gschwendtner, 1937:4; Csiki, 1947:676; Guignot, 1947:225. a FIGURE 58. Lateral wings of metathorax: а —Hydaticus; b—Graphoderes. Lateral margin of pronotum without ridge. Prothoracic process rounded at the end. Anterior outer marginof lateral wings of metathorax (Figure 58a) 324 305 straight. Spines of hind tibiae pointed. Ventral margin of first 4 segments of hind tarsi concave, with dense, short, adpressed, golden-yellow setae. This tribe contains 4 genera, 2 of which occur in the Palearctic and only one genus occurs in the USSR. 34. Genus Hydaticus Leach. teach uel. 200. Mise., 1:69: эспо[х, 1929, Col. Centralbl.;,1V:34: Gschwendtner, 1937:5; Csiki, 1946:676; Guignot, 1947:225. Уре зресцес: Diy UNS CUS бсемтитоек“ Deg: Lateral wings of metathorax narrow, tongue-shaped. Hind claws markedly different: outer claw half as long as inner claw, more curved at the end. Fore tibiae of male very short, triangular, without terminal spur; adhesive disc with 3 or 4 large suckers and a few small suckers which decrease in size toward the apex; mid tarsi of male also with large suckers. The genus contains about 100 species, most of which occur in tropical Africa; a few species occur in America and Australia. Key to Species 1 (14). Hind femora with strong, dense dots on the ventral side; hind tibiae long, with deep, oblong dots on the whole surface, interspersed with small dots (1. Subgenus Hydaticus s.str.). 2 (3). Elytra with longitudinal yellow lines in both sexes; black stripe from base of pronotum not reaching middle of pronotum; wrinkles usually present on sides of pronotum and elytra of female ..... 5h SREB о EER ON ip aie SAR ye *i. H.(s. str.) stagnalis (Fabr.). 3 (2). Yellow longitudinal lines on elytra of male absent, but a yellow band may be present near the base; yellow longitudinal lines present or absent in the female. 4 (5). Basal stripe of pronotum well marked, reaching far beyond middle anteriorly, almost reaching anterior margin. Two yellow spots on vertex, and usually an additional transverse spot on the frons before these 2 spots; this transverse spot sometimes not distinctly delineated anteriorly. Wrinkles always present on sides of pro- notum, but usually not numerous and weakly marked. Elytra without yellow on disc in both sexes, rarely a small yellow spot near the scutellum; punctation fine, large dots absent; sutural angle slightly produced posteriorly ...... ... Ж2. Н. (3. str.) seminiger (Deg.). 5 (4). Basal stripe of pronotum not reaching its middle, rarely reaching slightly beyond middle; frontal spot always absent. Elytra with fine punctation, and with more or less numerous large, scattered, slightly depressed dots. 6 (13). Elytra with few, scattered, large, shallow dots which are weakly marked and sparse. Yellow band near base of elytra of male absent in most species; yellow longitudinal lines present or absent in female. 325 306 Basal stripe of pronotum distinct, reaching slightly beyond middle. Band near base of elytra usually absent, represented rarely by 1 or 2 small spots; yellow longitudinal lines absent. Wrinkles at sides of pronotum and elytra of male rudimentary or absent... . EAE EEN DA US EMS PRET *3. H. (s. str.) schelkovnikovi Zaitz. Basal stripe of pronotum not reaching middle. Wrinkles at sides of pronotum rudimentary, replaced by short dashes and dots; elytra without wrinkles. Elytra without band near base and without yellow lines in both sexes. Sutural angle slightly pro- duced posteriorly ee aie aie ease: *4. Н. (s. str.) laeviusculus Popp. Wrinkles at sides of pronotum and elytra of female always present and well marked. Elytra of male with a yellow band near base which is complete or interrupted, with yellow longitudinal lines in the female. Sutural angle distinctly produced in a short beak. More oblong, larger (14—15 пт). Wrinkles on elytra of female not very deep, running posteriorly and inward for a shorter distance, Karelyercaching lareralemarcmy co: mu dileron el ytd ние BRAIN ASC UA IR Gn ago a *5. Н. (5. str.) laevipennis Thoms. Shorter, smaller (12—13mm). Wrinkles of female sharp, deep, more displaced anteriorly on the disc; they reach beyond middle InSeie Тажелоа NL TeaeTeeMa | ois |b ocd, oo 6 a 0 *6. H. (s. str.) rugosus Popp. Elytra with coarse dots, which are denser and more distinct. Basal stripe of pronotum reaching beyond its middle. Yellow band near base of elytra complete in both sexes; yellow longitu- dinal lines absent. Wrinkles at sides of pronotum rudimentary, replaced on sides of elytra by dense, large dots in the anterior half Blea MoT Mat PEE WARY ake *7, Н. (s. str.) transversalis (Pontop.). Hind femora almost without dots; hind tibiae short, without fine punctation between the deep oblong dots. Background of elytra completely black or with speckles only in the outer half; yellow longitudinal lines or spots present. Smaller (9—11 ми). Elytra with thin, longitudinal yellow lines which are arranged in pairs; dark background divided into more or less large speckles inthe jouterthalt. ae wk oss ae eee т... *8. Н. (3. str.) grammicus Germ. Larger (over 12mm). Elytra with uniform black background and yellow lines or spots, without speckles. Pronotum yellow; its anterior and posterior margin with a black border. Body broadly oval. Elytra with 2 yellow longitudinal Stripes and а vellow spot mear they seubel а BAIS SEAN AMAA TR: xia di ПИ Ole ба 9. H. (s. str.) bowringi Clark. Pronotum black, with a more or less broad lateral yellow border. Yellow lateral stripe on elytra narrow, sharply delimited ...... о 10. Н. (s. str.) vittatus (Fabr.). Lateral stripe on elytra broad, even broader in the middle, with Giffuse amlatc ines a hwaue Aiea aie 11. H. (s. str.) histrio Clark. Black background of elytra consisting of speckles as in species of Rhantus (2. Subgenus Guignotites Brinck). Black speckles uniformly distributed on whole surface of elytra or sometimes slightly denser in the presutural space. 326 24 '(25).' Punctation of elytra weaker’ ‘...’... *12. Н. (G.) leander (Rossi). 13. H. (G.) ponticus Sharp. о onuelytravdenser and stronger "о осы Ae ERAN APES OOF! TOT me GOR MONET aN tole Belt er, 14. H. (G.) fabricii Mac Leay. 26 (23). Speckles in middle of elytra and posteriorly denser, forming ранее SRE Way ie hw Be Ute: 15. H. (G.) thermonectoides Sharp. о) "Brownish black, mesothorax yellowish black". 9. 20k Soe. A Lee he hati ce Ри. тЫ МОЕ Ж7. H.transversalis (Pontop.). PCO ee Uinitormly brown (igure БО в *2. H. seminiger (Deg.). 1. Subgenus Hydaticus s.str. Guignot, 1947:226. Type species: Dytiscus transversalis Pontop. (307) К ¢ у / *1. Hydaticus (5. str.) stagnalis (Fabr.). % —¢ К Fabricius, 1787, Mant. Ins.,1:191 WwW (Dytiscus); Scholz, 1929, Col. Centrlbl., == [У:5; Gschwendtner, 1937:10; Csiki, 1 \ 1946:678; Guignot, 1947:228. SS ДК Be Y=. Short, broadly oval, moderately convex, => ——_ 7% slightly shining, black; head and pronotum =. а. о SS reddish yellow; black area on vertex =. small, with only 2 small yellow spots; A base of pronotum with a black stripe which is shorter laterally, reaching beyond middle of prontoum, shorter than black field at base of elytra; elytra with a broad yellow stripe at lateral margin in both sexes (stripe divided by a black dash in the posterior half) and with 5 yellow longitudinal lines which are connected at the base by a transverse band; outer line often divided into small spots; venter black, except anterior part of prothorax; abdomen often pitch brown; sternites 3—5 with a more or less distinct 307 FIGURE 59. Hydaticus seminiger Deg. reddish spot at the sides. Elytra very Larva, delicately and finely punctate and with co 2777 SS [< Ей 327 308 small, shallow, scattered dots. Fore claws of male long, strongly curved at the base, then straight toward the apex. Sides of pronotum and anterior half of elytra of female normally with a few wrinkles which are often much reduced (absent in specimens from eastern Siberia and North America). Length 12.5—15 mm. This is the only species in the USSR in which the male has yellow longitudinal lines. Distribution. European USSR (rare in the north), Siberia to Maritime Territory. Northern and Central Europe, North America. ж2. Hydaticus (s. str.) seminiger (Deg.). De Geer, 1774, Мет. Hist. Ins.,1V:401 (Dytiscus); Scholz, 1920, Col. Centrbl., 1V:5; Gschwendtner, 1937:9; Csiki, 1946:678; Guignot, 1947:226. Oblong oval, convex, weakly shining, black; dark area on head reaching far anteriorly; two yellow spots on the vertex, and usually an additional transverse spot on the frons; spot often open anteriorly; black area on pronotum extending from the base far beyond the middle, almost fused with the narrow black stripe at the anterior margin; elytra without yellow band near the base or yellow lines on the disc in both sexes; rarely a small yellowish spot near the scutellum; yellow border at lateral margin narrow, almost completely divided by a black diffuse line. Venter black; antennae, forelegs and femora of midlegs reddish yellow; mid tibiae and tarsi and hind legs reddish brown. Elytra with a distinct network and delicate punctation; a few coarser dots only near lateral margin. Male. Fore and mid tibiae broader than in female. Spots on pronotum of female larger. Fore claws of male asin H.stagnalis. Wrinkles at sides of pronotum and elytra of female weaker than in H.stagnalis, but always present. Length 13—14.5 mm. Distribution. European USSR, Siberia to Yakutia and Transbaikalia (Khilok River). Greater part of Europe. *3. Hydaticus (5. str.) schelkovnikovi Zaitz. Zaitsev, 1913, Izvestiya Kavkazskogo muzeya, VII:197; same author, 1927:31; Gschwendtner, 1937:16. — litoralis Zaitsev, 1913, Izvestiya Kavkazskogo muzeya:198. Oblong oval, with distinctly rounded sides; strongly convex, slightly shining, black; head reddish yellow, dark in the posterior half, dark area before vertex with 2 transverse yellow spots; its anterior margin with an indentation on the frons (representing a trace of the yellow frontal spot); pronotum with a narrow black stripe in middle of base; stripe reaching middle of pronotum or slightly farther anteriorly; elytra with a narrow, lateral, reddish yellow border which usually does not reach the apex; this border is divided almost completely by a black dash which is often divided into double small spots; a second shorter black line often present inside this border; a small yellow spot closer to the lateral border; a narrow 328 309 yellow band or spots often near the base in both sexes; yellow longitudinal lines absent. Punctation of elytra double as in H.transversalis, but secondary (coarse) dots smaller and more scattered than in H.trans - versalis; the longitudinal rows of dots well marked. Fore claws moderately long, strongly curved at the base, then straight. Traces of wrinkles in form of dashes and coarse dots at lateral margin of pronotum of female, especially posteriorly; sides of elytra without wrinkles; coarse dots which are present in females of H.transversalis are absent in this species. H.schelkovnikovi differs from H.transversalis also as follows: larger size; body more convex, and oblong; yellow lateral border on elytra narrower; fore claws of male thicker and slightly longer; black stripe at base of pronotum shorter and narrower than black space on the elytra contiguous with it. Length 12.5—14.5 mm. Distribution. USSR: Transcaucasia. *4. Hydaticus (s. str.) laeviusculus Popp. Poppius, 1906, Russkoe Entomologicheskoe obozrenie, VI:58; Gschwendt- ner, 1937:9.— ?rugosus Gschwendtner (not Poppius). Form of body as in H.seminiger Deg., but smaller; black area on head not reaching as far anteriorly; frontal spot absent; only two spots on vertex; main black stripe on pronotum short, not reaching middle, not broader laterally; anterior margin of pronotum uniformly rounded, without median process; sides of pronotum markedly more rounded; fine punctation of elytra more delicate; secondary (coarser) punctation distinct, but less distinct thanin H.transversalis; sutural angle at apex of elytra forming a distinct short beak. Fore claws of male slightly longer and markedly more massive. Sides of pronotum of female usually with weak wrinkles in form of dashes and coarse dots (as in H.schelkovnikovi); humeral angle of elytra with about 10 coarse dots and 2 or 3 dashes. Length 13—14 mm. Distribution. This species has been described from a single female from Manchuria (Khingan). I have two specimens from Manchuria (Heng-tao-ho-tzu) and a large series from the Maritime Territory, Trans- baikalia, Yakutsk, the Urals, and also from the Novgorod Region. This species apparently is widely distributed throughout the Eurasian taiga, and it has been confused with H.seminiger. *5. Hydaticus ($. str.) laevipennis Thoms. Thomson, 1867, Skand. Col.,1Z:88; Scholz, 1929, Col. Centrbl., IV:5; Guignot, 1947:227; stagnalis var. Gschwendtner, 1937:11. A valid species (against the opinion of Gschwendtner). Closely related to H.stagnalis, but differing from it in the oblong, narrower body which is narrower posteriorly; coloration darker; sides of pronotum more tapering anteriorly; stripe in middle of base of pronotum broader (as broad as adjacent black background of elytra); band near the base of elytra of male often divided into spots, rarely almost absent. Sutural angle more 329 310 distinctly projecting posteriorly; wrinkles at sides of pronotum and elytra markedly sharper and extending for a greater distance. Fore claws longer than in H.seminiger; penis thicker, more concave on the ventral side. Female. Yellow longitudinal lines on elytra usually present, but shorter and thinner; sides of pronotum and base of elytra with wrinkles. Length 13) 9—6) magna, Distribution. Northern and central European USSR, to the Vladimir and Poltava regions; Siberia (taiga). Northern Europe. * 6. Hydaticus (s. str.) rugosus Popp. Poppius, 1905, Ocivercs, Pinska Vier SoC Och) xii Vill: 23 Ta Zarusiene 1910:44; ? Gschwendtner, 1937:17. This species is transitional between H.laevipennis and H.stag- nalis. It differs from the former as follows: smaller; sides of pronotum more rounded and narrower anteriorly; body shorter, more oval; wrinkles at sides of pronotum of female deep, covering almost whole surface of pronotum; only a small area in middle of disc without wrinkles; wrinkles on elytra also sharp, covering two thirds of surface, reaching the presutural yellow stripe in the anterior half; longitudinal rows of dots of male weakly marked; masked by rugosity in the female. Outer claw of hind legs half as long as inner. Dorsum markedly less shining, almost mat in the female. Resembling © H.stagnalis inform of body and size; differing from it as follows: strong development of rugosity in the female; absence of yellow longitudinal lines on elytra of male, which have only a narrow band near the base which is sometimes more or less reduced; rudiments of longitudinal lines rarely also absent, black stripe at base of pronotum longer laterally; sutural angle distinctly produced posteriorly (as in H.laevipennis). Length 12—13 mm. Distribution. Yakutia — Ust'-Aldan (Poppius), Yakutsk (Zaitsev), Bulun (one female); Irkutsk (both sexes, Yurinskii). ж7. Hydaticus (s. str.) transversalis Pontop. (Figure 60) Pontoppidan, 1763, Dansk. Atlas, 1:677; Gschwendtner, 1937:8; Csiki, 1946:677; Guignot, 1947:228. — degeneratus Westhoff, 1882, Kaf. Westfal., П:305. — sahlbergi Zaitsev, 1905, Russkoe Entomologicheskoe obozrenie, V:226; subsp. laevisculptus Zaitsev, 1910, Russkoe Entomologicheskoe obozrenie, Х:223. Regularly oval; uniformly tapering anteriorly and posteriorly; slightly convex, Shining; head reddish yellow, with 2 spots on the vertex and a half- open frontal spot; black stripe in middle of base of pronotum narrow, not reaching middle of pronotum; its anterior margin forming a semicircle, with a small process in the middle; elytra black, with a broad lateral yellow stripe which is interrupted subapically and divided by several black longi- tudinal punctate lines which are partly divided into speckles; both sexes normally with a narrow yellow band near the base (this band rarely reduced — form degeneratus Westh.); short rudiments of yellow longitudinal lines 330 rarely present, hardly visible on the black background; venter reddish brown. Dorsum with distinct double punctation; small dots on the back- ground of the delicate network, and also distinct, coarser, shallow, dense dots which are especially well marked on head and sides of elytra. Fore claws of male markedly curved. Sides of pronotum of female with indistinct wrinkles on a small area toward the inside; these wrinkles rarely form several needle-shaped dashes on the humeral angle. Length 12—13 mm. Distribution. European USSR to Ciscaucasia, Black-Sea shore of Caucasus, Tomsk Region; Europe, except extreme south; ? Japan; subspecies laevisculptus — Asia Minor. 7a. Hydaticus (s. str.) transversalis laevisculptus Zaitz. FIGURE 60. Hydaticus transversalis Pontop. у ь Е ох Differing from the nominate form in its smaller size, stronger sheen, more delicate sculpture of elytra, and absence of wrinkles at sides of pronotum of female. Distribution. Asia Minor. *8, Hydaticus (5. str.) grammicus Germ. Сегтаг, 1830, Fr. Ins. Eur., XIII,t.1; Gschwendtner, 1937:14.— lineo- latus Ménétriés, 1832, Cat. rais.:140.— nigrovittatus Clark, 1864, EranseiEmtecsoc! 04:13). 1:222: Broadly oval, strongly shining; reddish yellow; head with a narrow dark border posteriorly; pronotum of uniform color; elytra with numerous black longitudinal stripes, inner and sutural stripes complete, with irregular margin, outer stripes usually double, more or less divided into small spots (speckles); venter reddish yellow; abdomen lighter. Dorsum, especially elytra, densely and strongly punctate; longitudinal rows of dots therefore weakly marked. Male. Fore tibiae short, slightly curved at the base; fore claws long, regularly curved. Female. Sides of pronotum with wrinkles. Length 9—11 mm. Distribution. USSR: Ciscaucasia, Transcaucasia, Middle Asia, Maritime Territory. Central and Southern Europe, Iran, Japan. 9. Hydaticus (s. str.) bowringi Clark. Clark, 1864, Trans. Ent. Soc. London, (3) 1:214; Régimbart, 1899:331; Gschwendtner, 1937:17; ab. nonconjunctus Zimmermann, 1917 (1919), Arch. f. Naturgesch., 83 А, 12:227; ab. transverseguttatus Zimmer- mann, ibid. :227. Broadly oval; strongly convex anteriorly; slightly flattened posteriorly; shining, reddish yellow; head with a broad, black border posteriorly; 331 311 pronotum with а narrow black stripe in middle of anterior margin and а broad black stripe at the base; both stripes often connected in the middle; elytra black, with two broad longitudinal stripes in the outer half which are fused subapically and with a small, round, yellow spot near the scutellum; lateral stripe sometimes reaching only to two thirds of the length and not fused at the end with the discal stripe (ab. nonconjunctus Zimm.); stripes sometimes normally long, but spot near scutellum broadened into a transverse stripe which reaches the discal stripe (ab. transverse- guttatus Zimm.); venter reddish brown. Dorsum with a weakly marked network which is slightly more distinct posteriorly; elytra with double punctation; rows of dots distinct. Sides of pronotum with weak wrinkles in the female. Length 12.7—14 mm. Distribution. Japan, Korea, China. 10. Hydaticus (s. str.) vittatus (Fabr.). Fabricius, 1775, Syst. Entom. App. :825 (Dytiscus); Régimbart, 1899:328; Gschwendtner, 1937:18. Very variable in size and coloration; many varieties have been described which are connected by transitions and apparently have no geographical character. Body more or less oval, moderately convex; head and pronotum black; anterior part of head and a more or less broad part of sides of pronotum reddish yellow; elytra black; outer third with two reddish yellow stripes which are usually subapically broadened in form of a knob or hook. This common pattern is often modified, e. g., the network may be very delicate and the punctation simple; there may be larger dots only at the sides of the elytra. Wrinkles present in the female only in posterior half of sides of pronotum, and not numerous. Length 12—14 mm. Distribution. Indo-Malayan Region, to North China and Japan. 11. Hydaticus (s. str.) histrio Clark. Gladk, 1862. Пеано. ВЕ. Soe,” ола (G)) 12222 Régimbart, 1899:330; Gschwendtner, 1937:20. More broadly oval and markedly more flattened than H. vittatus; yellow lateral border of pronotum broader, and its inner margin not sharp; elytra reddish yellow, with a narrow black lateral stripe and a broad sutural stripe which tapers near the apex and near the base; a black stripe from the shoulder toward the apex; this stripe is slightly narrower anteriorly and posteriorly and does not reach the apex or the base; this pattern varies sometimes; the black stripe on the disc may be reduced to a small spot, or the black area may be so broad that only the following yellow markings remain: a stripe near the lateral margin, which is diffuse behind the middle, an apical spot, a round spot at the base, and a double spot nearthe scutellum. Wength) 12—=13.3 mim. Distribution. Northern India, Iran. 332 2. Subgenus Guignotites Brink. Brinck, 1943, Forh. К. Fys. Sallsk. Lund 13:8.— Isonotus Houlbert. Type species: Dytiscus leander Rossi. Black background of elytra consisting of speckles (as in species of Rhian tus) 312 *12. Hydaticus (Guignotites) leander (Rossi). Rossi, 1790, Fn. Etrusca:202 (Dytiscus); Zimmermann, 1927, Suppl. Entom., XVI, sep. :36; Gschwendtner, 1937:13; Guignot, 1947:229.— conti- nentalis B. Browne, 1944, Ann. Mus. Hist. Nat., 11:365. Very variable in form, size and coloration; however, this species is easily recognized by its habitus. This species may be considered at first as a species of Rhantus (it has the characteristic black speckles on the reddish yellow background). Oval; narrower or broader, convex; shining, reddish yellow; head with a narrow black border posteriorly; pronotum usually with a narrow black border before the scutellum; often a similar border at the anterior margin; elytra with black speckles which are some- times denser near the yellow sutural line; these speckles sometimes form an oval spot on the disc of each elytra; elytra sometimes completely black (except lateral margin and sutural stripe); head and pronotum also some- times very dark (basal and anterior stripes broadened so that they become connected). Network on elytra simple; a few scattered, more or less large dots only near the apex and laterally; rows of dots distinct, not confused posteriorly. Male. Fore claws short and broad. Length 8.5—11.5 mm. Distribution. USSR: Azerbaidzhan. Mediterranean to Syria; Africa. 13. Hydaticus (Guignotites) ponticus Sharp. Sharp, 1880—1882:662; Régimbart, 1899:325; Gschwendtner, 1937:20. According to Gschwendtner, this species differs from the widely distributed H.leander inits smaller size, in the more rounded, shorter and more convex body, and in the coarse punctation on the disc of the pro- notum. This species resembles H.leander in other characters. Ido not know this species. In view of the great variation of H.leander, H.ponticus is probably not a valid species. Length 9—10 шт. Distribution. Iraq, northern India, ? China. 14, Hydaticus (Guignotites) fabricii Mac Leay. Мас Leay, 1833, Ann. javan.:134; Régimbart, 1899:324. — rhantoides Sharp, 1880—1882:664.— fengi Falkenstrom, 1936, Lingn. Sc. Journ., 15:236. Closely resembling H.leander; itis also very variable in all characters and is a vicarious species of H.leander inthe East. The 333 fe 3 only reliable difference between the two species is the marked and constant difference in the genitalia and the coarser and denser punctation on the elytra. Length 8.7—9.7 mm. Distribution. Tropical and subtropical Asia to Szechwan and Japan; Australia. 15. Hydaticus (Guignotites) thermonectoides Sharp. Sharp, 1884, Trans. Entom. Soc. London:447; Gschwendtner, 1937:21. Broadly oval; narrower anteriorly, moderately convex; shining, reddish yellow; elytra with speckles, which form a small spot on the shoulders; they form two bands in the middle and near the apex. Hind legs short. Punctation of elytra double. Length 8.5—10 mm. DAS iat bub Ons Japan, Chinas 13. Tribe THERMONECTINI Sharp, 1880—1882:672; Régimbart, 1895:4; Gschwendtner, 1937:230. Lateral margin of pronotum without ridge. Prothoracic process rounded apically. Anterior outer margin of lateral wings of metathorax strongly curved. Spur at end of hind tibiae blunt or jagged, forming 2 short denticles, Lateral margin of elytra smooth in the posterior half, not serrated. This tribe contains 10 genera distributed in all zoogeographical regions; only 2 genera occur in the Palearctic Region. Key to Genera 1 (2). Pronotum and elytra almost smooth, with hardly marked fine punctation; elytra of female may be covered with tubercles. Fore tarsi of male with several large and numerous small suckers ... Me er ua eon cheats inl ded СО ОВО В На О 35. Graphoderes Aubé. 2 (1). Elytra and pronotum with coarse dots; elytra of female sometimes with longitudinal grooves with short hairs. Fore tarsi of male with OMS авые ам ву паек SWIGISHOS по oc 36. Acilius Leach. 35. Genus Graphoderes Aubé. Aubé, 1838, Spec. Col., VI:215; Gschwendtner, 1937:27; Csiki, 1946:679; Guignot, 1947:231. iy perspeclesa и ею ес асы Е Broadly oval, slightly convex; lateral margin of pronotum and elytra forming a continuous curve. Elytra black, with small yellow speckles. Prothoracic process short, broad, rounded at the end. Lateral wings of 334 metathorax (Figure 58Ъ) very narrow. Hind tibiae broad, shorter than femora; terminal spurs with 2 denticles at the end or blunt. Claws of hind legs different. Females of many species dimorphous: elytra either smooth as in the male or covered with granules (tubercles). Larva (Figure 61). Spindle-shaped, markedly hump-backed, curved. Head flattened, slightly triangular, markedly tapering posteriorly; last (4th) antennal segment small, conical; 2nd or 3rd segment of mature larvae with accessory segments near the base; cerci without natatorial hairs, but with 7 primary setae (one of them rudimentary). Pupa. Pronotum indented, bilobed anteriorly. Tubercles in middle of tergites large, at least inner tubercles. Cerci thick, slightly curved inward at the apex. The genus contains 10 species distributed in the Holarctic Region; one species has been recorded from Madagascar, but this is probably erroneous. 314 Key to Species 1 (6). Metathorax between mid and hind coxae almost as broad as meta- thoracic process between mid coxae. Claws of tarsi of midlegs different, 2 (3). Body slightly broader behind the middle, slightly convex. Tarsi of midlegs of male not broadened, without suckers ............ и Е ею. Х1. G.austriacus (Sturm) . 3 (2). Markedly broader behind middle, more convex. Tarsi of midlegs of male broadened, with suckers. AG). Venter reddish yellow; hind legs uniformly Ио... .... Ne Gh BME ЗОВ ИИА О И ke fon ое *2. G.bieneri Zimm. 5 (4). Venter blackish brown; hind legs of the same color, but femora ео эта и. Па. *3. G.adamsi Cl. 6 (1). Metathorax narrow between mid and hind coxae. Claws of mid- legs equal. 7 (8). Epipleura very broad, forming a pointed edge together with the elytra; sides of elytra slightly depressed at level of sternites 2—3, then flattened. Pronotum with a narrow border at the anterior maroinvand at thesbase chant и *4. G.bilineatus (Deg.) . 8 (7). Epipleura of the usual type, convex. Lateral borders of pronotum broader. 9 (12). Tarsi of midlegs of male narrower than tibiae; not more than 30 suckers on the fore tarsi. 10 (11). Shorter and markedly broader posteriorly than anteriorly. Posterior angles of pronotum only slightly or not projecting posteriorly. In the typical form, black borders of pronotum reaching lateral margin. Fore tarsi of male with only about 26 suckers; mid tarsi with 14 suckers in 2 regular rows, 7 in each; additional suckers absent. Outer claw of hind tarsi of female more than half as long as inner claw, and strongly curved AUSSI varia АЕ LUMA RRNA tea he EEA TAY Paha ter *5. G. cinereus (L.). 11 (10). Narrower and longer. Mid tarsi of male with two rows of suckers which are more or less double in some places, i. e., there are 335 3 or 4 in each transverse row. Posterior angles of pronotum distinctly projecting. Outer claw of hind tarsi of female at most half as long’ as inner and (slightly curvedvapically ее ее eg bah give tS" Bu о OMEN CME REST a areata и Е *6. С. zonatus (Hoppe.). 12 (9). Mid tarsi of male broader than tibiae, with numerous small suckers, 8 in each transverse row; fore tarsi with about 70 small suckers shah sony одне ан eugene: cor caine ...... ЖТ. а. piciventris Thoms. Key to Larvae of Graphoderes Thoms 1 (2). Head slightly narrowed posteriorly, massive, like the body ..... sis of i in i eal i AML ARN a as Lhd colle! Sele pee Meee ey Ode а 2 (1). Head distinctly narrowed posteriorly; body narrower (Figure 61) а. И о есь. *6. G.zonatus Hoppe. *1. Graphoderes austriacus (Sturm). Sturm, 1834, Deutschl. Ins., VIII:46 (Dytiscus); Gschwendtner, 1937:29; Csiki, 1946:680; Guignot, 1947:123. 315 Oval, slightly broader behind the middle; reddish yellow; pronotum with broader borders at anterior margin and base, reaching to head and elytra; venter, antennae and legs reddish yellow. Dorsum with a delicate network and fine, small punctation; there are also scattered dots which are especially well marked at the sides of the elytra. Usual rows of dots weakly marked. Fore tarsi of male with 16 suckers in 4 rows; mid tarsi without suckers; this distinguishes this species from all others. Elytra and venter of female markedly more punctate; sides of pronotum with dots and wrinkles. Length 1213) ат. Distribution. Central and southern European USSR: Transcaucasia, Turkmenia, Kazakhstan, steppes of West Siberia, Trans- baikalia, Amur Area. Central Europe. *2. Graphoderes bieneri Zimm. Zimmermann, 1921, Koleopt. Rundschau, IX:31; Gschwendtner, 1937:28. FIGURE 61. Graphoderes zo- natus Hoppe. Larva. Body ovoid, markedly broadened behind middle; dorsum very convex in anterior half of elytra, reddish yellow; pronotum with a broad black border at anterior margin and base; this border reaches to the head and elytra; anterior border with a posteriorly directed process at its outer ends; venter reddish brown; abdomen and 336 legs lighter; hind femora of uniform color. Rows of dots of elytra weakly marked, especially the 2nd (outer) row. Fore tarsi of male with one large sucker, 2 to 4 medium-sized and more than 30 small suckers; mid tarsi with 24 small suckers in 2 rows. Sides of pronotum of female with a number of longitudinal, more or less long wrinkles decreasing in length toward the middle. Length 13—14 mm. Distribution. USSR: Maritime Territory. *3. Graphoderes adamsi Cl. Clark, 1864, Trans. Ent. Soc. London, (3) 1:211; Gschwendtner, 1937:28. Closely related to G.bieneri, differing from it in a number of charac- ters; border at anterior margin of pronotum and at base slightly smaller; anterior border not forming hooks at the ends; venter (except prothorax) darker, blackish brown; femora of hind legs yellow in apical third or half. Suckers of fore tarsi of male slightly smaller (one large, 2 medium sized and 24 small suckers). Borders on pronotum of female broader. Length 125: 4.0 TT, Distribution. USSR: Maritime Territory (Lake Khasan, Tumen River, several specimens). Japan, China. *4, Graphoderes bilineatus (Deg.). De Geer, 1774, Mém. Hist. Ins., [У:400 (Dytiscus); Gschwendtner, 1937:29; Csiki, 1946:681; Guignot, 1947:235. 316 Differing from all other species in its very broad and flat body, and especially in the broad epipleura, which taper only from sternite 3 onward; their lateral margin forms a sharp ridge above sternites 2 or 3 together with the elytra; sides of elytra slightly depressed. Reddish yellow. Borders at anterior and posterior margin of pronotum narrow; venter reddish yellow. Fore tarsi of male with suckers, one large, 2 medium- sized and 32 small suckers; mid tarsi with 16—18 small suckers in 2 rows. Sides of pronotum of female with the usual wrinkles. Length 14.5-16mm. Distribution. European USSR: West Siberia. Northern and Central Europe to central Italy and Bosnia. *5. Graphoderes cinereus (Т..). Linnaeus, 1758, Syst. Nat., ed. 10, 1:412 (ВУ 1 scus); Gschwendtner, 1937:31; Csiki, 1946:681; Guignot, 1947:233; female ab. bertolinii Seidlitz, 1887:107; ab. intermedius Westhoff, 1881, Kaf. Westf., 1:58; ab. simulator Westhoff, 1882, ibid., П:304. Slightly ovoid, moderately broad behind middle; narrower anteriorly; reddish yellow; black borders at anterior and posterior margin of pronotum of the typical form reaching to the margin; border at anterior margin of pronotum rarely not reaching margin, leaving a yellow stripe (ab. inter- medius), or border and, black stripe at the base not reaching the margin 337 (ab. simulator); the pattern of the pronotum resembles in this case that of the typical form of G.zonatus Hoppe. Broadened fore tarsi of male with 3 larger suckers at the base and 26 small suckers; mid tarsi with 2 rows of suckers, each with 7 suckers. Females dimorphous: common form smooth and with only wrinkles on sides of pronotum; second form (eastern Alps) with elytra covered with granules (var. bertolinii). Length 13.5—15 мата. Distribution. European USSR: except extreme north (from the Leningrad Region to the south), Transcaucasia, Tomsk, ?Transbaikalia (Lindeman; this record possibly refers to G.zonatus). Europe, except extreme north and south; North America. *6. Graphoderes zonatus (Hoppe). Hoppe, 1795, Enum. ins.:33 (Dytiscus); Gschwendtner, 1937:31; Csiki, 1946:682; Guignot, 1947:234; elatus Sharp, 1880—1882:695; female ab. rosenbergeri Seidlitz, 1887:107; ab. interjectus Westhoff, 1882, Kaf. Westfal., 11:304; ab. flavotestaceus Sahlberg, 1873, Not. Sallsk. Fn. Fl. Fenn. Forh., ХПУ:161; ab. biconnatus Delahon, 1915, Deutsch. Ent. Zeitschr. :394. Longer and narrower than G.cinereus; epipleura also narrower. In the principal form, both black borders of pronotum (at anterior and posterior margin) not reaching lateral margin; posterior border rarely reaching lateral margin (ab. interjectus); both posterior and anterior border rarely reaching lateral margin (ab. biconnatus); the pattern thus resembles that of the principal form of G.cinereus; whole dorsum sometimes light, and black speckles very small (ab. flavotestaceus). Posterior angles of pronotum distinctly projecting posteriorly. Male. Fore tarsi with 32—36 suckers, 3 or them large; first 3 suckes of mid tarsi as broad аз the tibiae, and 16—22 suckers arranged in two irregular rows which are confused at some points, so that there is not a pair of suckers in each transverse row but 2 ог 3, ог even 4. Female. Pronotum with the usual wrinkles at the sides; punctation of elytra slightly stronger; surface some- 317 times granulate (ab. rosenbergeri); outer claw of hind tarsi twice as long as inner, slightly curved apically. Length 14—15 mm. Distribution. European USSR: Transcaucasia (highlands), Siberia to the Maritime Territory. Northern and Central Europe, Turkey (Sari- kamis, Gatak), North America. The form of female with granulate elytra (ab. rosenbergeri) was described from one female from Latvia; I have a second such specimen from Lake Tabatskuri (Georgia). *7, Graphoderes piciventris Thoms. Thomson, 1868, Skand. Col., Х:351; Gschwendtner, 1937:30; ab.:sahl- bergi Seidlitz, 1887:107; female ab. verrucifer Gyllenhal, 1827, Ins. Suec., 1V:376. 338 318 Differing from G.zonatus mainly in the greater number of small suckers and the strongly broadened mid tarsi of the male, which are markedly broader than the tibiae and bear about 50 suckers; about 70 suckers on fore tarsi. Coloration of venter varying from uniformly black to spotted or uniformly yellow (ab. sahlbergi Seidl.). Borders on anterior and posterior margin of pronotum usually reaching to the margin; rarely separated from the margin by a yellow line. Elytra usually darker than in G.zonatus. Female dimorphous: in one form (less common) almost whole pronotum covered with more or less strong wrinkles which converge radially toward the middle (in which is a small, smooth, rounded area); second form more common: surface of elytra granulate (ab. verrucifer; this name has priority and should be the name of the species instead of G. pici- ventris). Whole dorsum with irregular, more distinct punctation in both sexes than in the other species. Length 15—16mm. Distribution. North of European USSR to Leningrad. North Siberia to Yakutsk. 36. Genus Acilius Leach. Leach, 1817, Zool. Misc., III:69; Gschwendtner, 1937:32; Csiki, 1946:682; Guignot, 1947:235. Type species: Dytiscus sulcatus L. Body flat. Dorsum, especially elytra, with dense, large dots. Pro- thoracic process broad, broadly oval, rounded at the end. Lateral wings of metathorax very narrow, broadened into lobes subapically. Fore tarsi of male with one large and 2 smaller suckers (or 3 suckers of equal size) and a large number of very small adhesive tubes; mid tarsi almost not broadened, bearing a large number of adhesive tubes among the long natatorial hairs. Elytra of female with 4 broad longitudinal grooves with hairs; grooves rarely bare; grooves absent in species of subgenus Homoelytrus. Larvae (Figure 62) resembling those of Graphoderes; however, the ligula of the labium is bifid. Pupae more flattened and their segments broader. This genus contains 8 species, which are distributed only in the Holarctic Region. Key to Species 1 (2). Hind legs blackish brown; hind femora yellow in the apical half... TEATS Ei ct Re ОЕ А AN *1. A. sulcatus (L.). 2 (1). Hind legs (including femora) uniformly reddish yellow. 3 (4). Pronc:tum with 2 black bands. Elytra yellow in both sexes, with dense black speckles; punctation of elytra of male uniformly dense О elles ications Oise о ОИ wae ees. Me. A. Canaliculatus Nic. 4 (3). Pronotum with only one band. Elytra light, with a few black speckles in female, almost without black speckles in male. Punctation of elytra of male more scattered at the base, near the scutellum.... оо ооо ооо РИ А с 3. А. sinensis Peschet. 339 Key to Larvae of Acilius Leach. 1 (2). Head slightly narrowed posteriorly, massive. Ligula with two almost straight lobes at the end ........ *2. A.canaliculatus Nic. 2 (1). Head prolonged posteriorly; lobules of ligula long and markedly TWISTER eh И И n eRe eae *1. A. sulcatus L. *1. Acilius sulcatus (L.). Linnaeus, 1758, Syst. Nat., ed. 10:412 (Dyt iscu s); Gschwendtner, 1937:33; Csiki, 1946:683; Guignot, 1947:236.—tomentosus Mochul'skii, 1845, Bull. Soc. Nat. Moscou, XVIII, 1:30. Broadly oval, usually more or less broadened behind middle (elytra broadly rounded apically); flat, slightly shining, reddish yellow; pronotum with 2 black bands on the disc, which are usually connected by a transverse dash at the ends; elytra (except sides andyellow sutural stripe) with dense black speckles which form an irregular narrow band in the posterior third; venter black; prothorax, lateral spots on sternites 2—6 and at posterior margin of sternites 3—5 yellow; legs also yellow, but hind femora black in the basal half; epipleura concave. Male. Elytra with rasp-shaped punctation; epipleura concave; fore tarsi with one very large and two smaller suckers; there are also 200—300 small adhesive tubes on a long stalk; mid tarsi almost not broadened, with an irregular row of small adhesive tubes at the margin, among tufts of long silky hairs; claws different; outer claw slightly broader and longer. Female. Pronotum with a large shallow depression on each side of middle which is covered with hairs; elytra with 4 longitudinal broad grooves of varying length; bottom of grooves with dots and yellow hairs; ridges separating the grooves finely punctate, with 3 weakly marked rows of dots; third ridge tapering behind middle for a short distance; sides of elytra flattened along last ridge and partly grooved. Epipleura flat or convex, with a weak depression near the shoulders. Length 15—18 пм. 919 Distribution. European USSR, West Siberia, Maritime Territory (a large series), I have not found this species in material from East Siberia and Transbaikalia. Europe, rare in the north; Asia Minor, north- west Africa (locally), Japan. FIGURE 62, Acilius sulcatus (L.). Larva. *2. Acilius canaliculatus Nic. (Figure 63). Nicolai, 1822, Diss. Col. Agri. Hal.:29; Gschwendtner, 1937:35; Csiki, 1946:684; Guignot, 1947:237.—laevisulcatus Mochul'skii, 1845, Bull. Soc. Nat., Moscou, XVII, 1:30; ab. kotulae Ulanowsky, 1883, Ber. Phys. Com. аа. Krakau, ХУПТ:6. 340 320 Closely related to A.sulcatus; smaller, narrower; venter uniformly yellow (ab. kotulae Ulan.), often with a more or less broad border at anterior margin of some sternites and with a dark area at sides of meta- thorax and hind coxae; legs uniformly yellow; only tibiae and tarsi of hind legs slightly dark. Epipleura flat. Pronotum of female without lateral depression, only with several silky, short hairs; grooves on elytra as in A.sulca- tus. Length 13.5—16 mm. Distribution. European USSR, Siberia to Kamchatka and Maritime Territory; records from Transcaucasia not reliable. Northern and Central Europe, sporadically distributed in the south. FIGURE 63. Acilius ca- naliculatus Nic. 3. Acilius sinensis Peschet. Peschet, 1915, Bull. Soc. Ent. Fr. :288; Gschwendtner, 1933:36.— guerryi Olsufiev, 1925, Bull. Soc. Ent. Fr. :90. Differing from A.canaliculatus in having only one black band on the pronotum and more scattered punctation on the elytra of the male, near the scutellum; punctation in female as dense as in A.canaliculatus; band on pronotum of male complete, bracket-shaped; this band usually inter- rupted in the middle in the female; elytra of male with indistinct black speckles; speckles better marked in the female; posterior third of elytra with a broad irregular black band in both sexes, which does not reach the suture ог the lateral margin. Length 14—18 шт. Distribution. China (Szechwan, Yunnan), 14. Tribe DYTISCINI Sharp, 1880—1882:632; Régimbart, 1895, Mém. Soc. Ent. Belg., IV:4; Zimmermann, 1917/1919:232; Guignot, 1947:239; Gschwendtner, 1937:1. Large species (19—40 пт). Posterior margin of first 4 segments of hind tarsi without setae at the outer apical angle or with very few setae. Hind tibiae narrow, longer than broad; outer terminal spur slender, not thicker than inner. Adhesive plates of fore tarsi of male rounded, with 2 large suckers at the base and numerous small ones. The tribe contains 2 genera, one in the Holarctic Region and the other in Australia. 37. Genus Dytiscus L. Linnaeus, 1758, Syst. Nat. ed.10,1:411; Gschwendtner, 1938:1; Csiki, 1946:684; Guignot, 1947:239. 341 Эа Туре species: Dytiscus marginalis L. Dorsum black or brownish black; sides of pronotum and elytra witha broad reddish yellow border which becomes wider posteriorly. Suture between clypeus and frons distinct, indistinct laterally. Pronotum without lateral rim. Elytra with 4 longitudinal rows of dots. There are weakly marked accessory rows between these rows in the male; sides usually with an oblique, oblong depression behind the middle, which is better marked in the female. Prothoracic process Slightly broadened behind the fore coxae, rounded or blunt terminally, with a distinct lateral rim. Lateral wings of metathorax narrow. Hind tarsi long, slightly broadened; claws almost equal. Male. Fore femora with a tuft of hairs at base of ventral margin; fore tibiae short and broad, without spurs; fore tarsi with a large adhesive plate with numerous suckers; mid tarsi broadened, their sole also with small suckers. Female. Dorsum with coarse, dense punctation; females of many species dimorphous: one form with smooth elytra as in the male, the other with longitudinal grooves which are shortened in the posterior third and broader at the sides of the elytra. Larva (Figure 64). Body slender, not hump-backed, spindle-shaped. Head flattened, rounded; clypeus broadly \ rounded; temples without spines; first 3 antennal segments either with a ring, FIGURE 64. Dytiscus marginalis L. Larva. or with an additional segment at the base; labium without ligula. Cerci with natatorial setae. Coloration brown. Pupa. Pronotum large, trapezoidal, with small sclerotized scales along the sagittal groove. Cerci thick, long, cylindrical. The species occur in stagnant water, marshes, rarely in running water. A dangerous pest of pond economy. Feeding on fish fry. Larvae especially harmful. Distribution of genus Holarctic, with more than 32 species; the genus is divided into 2 subgenera. Key to Subgenera 1 (2). Labrum without indentation in the middle or indentation hardly marked. Anal sternite of male with isolated cilia at the posterior TVA UTD eps alle wan cuca na iee а care Se 1. Subgenus Dytiscus s. str. 342 2 (1). Labrum with а distinct indentation in the middle. Anal sternite of male; withouticilial Me Hts is SYeG: с 2. Subgenus Macrodytes Thoms. 1 (10). Cerci more than half as long as last segment. 2 (5). Head longer than broad; clypeus more or less long. 3 (4). Clypeus long; cerci shorter than penultimate segment ....... о acis le ce het ae ep О See RARER a | EA 7. О. pisanus Cast. 4 (3). Clypeus shorter; cerci аз long as penultimate segment ....... А BT abe WWE Ta et a. Sah cages ayia) weed *8. D.marginalis L. 5 (2). Head broader than long; clypeus more or less short. 6 (9). Larger (53-60mm). Clypeus rounded anteriorly. (8). Fore tarsi large. Coloration mainly greenish black ......... В В MOU DOSES Я SL lees ао *12..D.circumflexus Fabr. 8 (7). Fore tarsi moderately long. Coloration rust brown-black ..... О daicte es dei Sreyvats a) va Megs *5. D. dimidiatus Brgstr. 96). smaller (50—55imm). Clypeus almost straight) и аи, .. .. mM MI Cert Neko ВОВ lige: “aia al cei aie’ *2. О. semisulcatus Mull. 10 (1). Cerci less than half as long as last segment. 11812) Такбек (60mm)....Clypeus almost truncate’anteriorly а, ЕН, О, ОЕ *1. D.latissimus L. IAC) smaller (53 ао), ‚ Clypeus rounded anteriorly 2...) ass n ... ROA Mea wees XE RAGE eer we i ake en eyelet a *16. О. circumcinctus (Ahr.). 1. Subgenus Dytiscus s.Sstr. Туре эрее!е3: Dytiis cus! Тата. Labrum without indentation in the middle or indentation hardly marked. Anal sternite of male with isolated cilia at the posterior margin. The subgenus contains only 2 species, one of them in North America. *1. Dytiscus (s. str.) latissimus Г. Linnaeus, 1758, Syst. nat., ed. 10,1:411; Gschwendtner, 1938:3; Csiki, 1946:686; Guignot, 1947:246. Broadly oval, slightly convex, greenish brown; labrum, clypeus, frons before eyes and around eyes, and an angular spot on vertex yellow; prono- tum with a broad, yellow, lateral border and with a narrow border at anterior margin and base (where it is slightly broader in the middle); yellow lateral border of elytra reaching to broad part of epipleura, tapering in the middle, very narrow at apex; an undulate transverse band subapically to the suture; margin of black epipleura also reddish; 4 inner grooves (sometimes also outer grooves) reddish or yellow at the bottom in the female; venter reddish yellow; legs brownish. Pronotum with a deep longitudinal depression; angles of pronotum rounded in male, pointed in female. Elytra very broad; 343 322 lateral oblique depression near middle very deep. Male. Larger, more shining; fine punctation on head and pronotum dense; there is also fine and sparse punctation. Elytra with 2 strong rows of dots on the disc; other 2 rows markedly weaker, especially in the posterior half; punctation distinct in basal half, coarser and denser posteriorly; fore tarsi with 1,000—1,200 small suckers, mid tarsi with 200—500; anal sternite with a weak indentation flanked by isolated coarse dots. Female. Fine punctation on dorsum denser, stronger, forming wrinkles; dorsum therefore less shining; prono- tum almost mat; elytra with 10 longitudinal grooves which do not reach the apex; outer 3 longitudinal grooves shorter; 8th groove posteriorly con- tiguous with the 9th, often also with the 10th; grooves smooth; intervals between them delicately punctate. Anal sternite with a deep indentation in the middle, flanked by irregular deep wrinkles. Length 36—44 mm. Distribution. Northern and central European USSR, to the northern Ukraine in the south, Astrakhan and Chkalov [now Orenburg] regions, West Siberia. Northern and Central Europe. Ecology. It occurs in large bodies of stagnant water (lakes). 2. Subgenus Macrodytes Thoms. Thomson, 1860, Skand. Col., 11:41; Gschwendtner, 1838:5; Csiki, 1946:686; Guignot, 1947:240. Type species: Dytiscus marginalis L. Key to Species 1 (6). Yellow border of pronotum present only at the sides. 2 (5). Processes of hind coxae broadly rounded at the end (Figure 65a). x Ww x e f g (323) FIGURE 65. Processes of hind coxae in species of Dytiscus: а —semisulcatus Mull.; b—-dimidiatus Brgstr.; с —marginalis (L.); d—pisanus Cast; e—cir- cumcinctus Ahr.; f —-circumflexus (Fabr.); $ —lapponicus Gyll. 344 20 (19). 21 (28). Narrowly oval, oblong; punctation on elytra of male coarse and dense in posterior third; uniform; elytra of female usually grooved, rarely smooth. ....... . *2. D.(M.) semisulcatus Mill. Broadly oval. Punctation on elytra of male coarse in posterior third, but irregular, sparser, forming transverse wrinkles; grooves on elytra of female rudimentary; only 4 or 5 inner grooves more Onilessomarked Pp sie eas sas as. 3. D.(M.) sharpi Wehncke. Processes of hind coxae narrowly rounded (as in D. pisanus). Body broad. Fore and mid tarsi of male strongly developed, thick; outer grooves on elytra of female broader than inner grooves... ея os or oe Se 4. D.(M.) validus Rég. Pronotum with a broad, yellow, lateral border, and also with more or less narrow borders at anterior and posterior margin, or only at the posterior margin. Processes of hind coxae (Figure 65b) rounded, not angular. Larger (to 39mm). Anterior margin with a narrow border; posterior margin with a similar border, or border absent ..... О р Оо Це ион *5. О. (М.) dimidiatus Brgstr. Smaller (at most 34mm). Border at anterior and posterior margin not very narrow. Trochanter of hind legs shorter, with angular, pointed end...... Abe a an ое ани не *6. D.(M.) delictus Zaitz. Trochanter of hind legs longer, their end produced into short, thin О А OS genleciay> PRIS geod CESS 7. D.(M.) pisanus Cast. Processes of hind coxae not rounded but forming a distinct angle or produced into a spine. Processes of hind coxae more or less broad; their inner margin convex or at least straight, ending in a short angle. Processes of hind coxae shorter and broader (Figure 65c). Venter light; only middle of metathorax and posterior margin of hind coxae dark, hind margin of abdominal sternites narrowly black о О MARC aT seus ieee *8. D.(M.) marginalis (L.). Venter largely dark; middle of the metathorax and the following areas black: middle of hind coxae, border at posterior margin; transverse spots on each side of middle of base of sternites 2 and 3 and anal sternite (sometimes also of the other sternites); trans- verse spots more or less large ..... *9. D.(M.) persicus Sharp. Processes of hind coxae slightly longer, more distinctly angular; coloration ог Vventervas in” №. pre Pr Sai US. ан. еее ж10. D.(M.) ВЕ Zaitzev, sp. п. Processes of hind coxae produced into a more or less long spine; their inner margin concave (Figure 65f, g). Border at anterior and posterior margin of pronotum broad, al- most as broad as black stripe on the disc. Elytra of male with narrow, longitudinal, reddish yellow lines; in grooved females, bottom of grooves also reddish yellow; lines rarely more or less rudimentary ss stele. НИ *11. D.(M.) lapponicus СУП. Border at anterior and posterior margin of pronotum narrower than black stripe on the disc. Elytra without yellow lines. Inner margin of eyes without yellow border. Processes of hind coxae produced into a long spine. 345 (324 22 (23). Lateral margin of pronotum not straight, but with a weak inden- tationinkthe, posteriori habia Воду парома Е TRNAS МЫ SD RA НЯ 6 *12. D.(M.) circumflexus Farb. 23 (22). Lateral margin of pronotum straight. (25). Pronotum less tapering anteriorly. Body broad, slightly convex. A reentrant angle between lateral margin of elytra and pronotum А i BEE a Rates BS Le AY a ARN *13. D.(M.) thianschanicus Gschw. 25 (24). Pronotum more strongly tapering anteriorly; lateral margin of pronotum forming a continuous curve with lateral margin of elytra. Body narrower, less broad posteriorly. 26 (27). Smaller (27—32 mm). Background of pronotum and elytra usually 7 SMO WRN EA LO EAL! AAAI YU, 8 *14. D.(M.) latro Sharp 27 (26). Larger (37mm). Background of pronotum brown. Body broad and и Re a OR Ee 15. D.(M.) distans Feng. 28 (21). Yellow area on clypeus continuing in a narrow border on inner margin of eyes, to posterior margin of eyes or beyond. Processes of hind coxae produced into a short or very short spine. 29 (30). Yellow orbital border reaching eyes to their outer margin. Processes of hind coxae short (Figure 65e). Venter slightly dark inisome) places as un, №, маеотоати и о ее Pee. О aT Cas NS eal WAN GO Oe *16. D.(M.) circumcinctus (Ahr.). 30 (29). Yellow orbital border shorter, not reaching upper margin of eyes. Processes of hind coxae long, but shorter than in D.circum- flexus. Venter largely dark; black spots present at the base, on each side of middle of sternites 2—3, and of anal sternite, often also onthe other sternites’ .. 4 seme *17. D.(M.) dauricus Gebl. *2. Dytiscus (Macrodytes) semisulcatus Mull. Muller, 1776, Zool. Dan. Prodr.:70; Gschwendtner, 1938:6; Guignot, 1947:241.— punctulatus Fabricius, 1777, Gen. ins.:238; ab. maurus Schaufuss, 1882, Ann. Soc. Ent. Fr., I1:CLXXIII: female ab. exspectatus Peyeringhott 1905, Вы. SOc. Е. Вх. :229): Oblong-oval, relatively narrow, brownish black, sometimes with а slight greenish iridescence; clypeus,-a diffuse V-shaped spot оп the frons and а broad border at sides of pronotum reddish yellow, and also the lateral border of the elytra, which is broad anteriorly, tapers before the middle and almost disappears toward the apex; whole venter, except the lighter fore and mid coxae and trochanters brownish black; whole dorsum rarely uniformly black (ab. maurus). Pronotum very long; elytra slightly broader behind middle. Row of dots at anterior margin of pronotum with a broad gap in the middle. Prothoracic process strongly convex between fore coxae; its apex long, narrow and pointed. Processes of hind coxae short, broadly rounded at the end (Figure 65a); trochanter very short. Male. Dorsum shining; head and pronotum finely punctate and with delicate wrinkles. Punctation of anterior third of elytra also fine, stronger posteriorly; dots in the posterior third of elytra coarse and very dense; both rows of dots on elytra strongly marked; other two rows (presutural and outer row) weakly marked. 346 825 Anal sternite with a weak indentation at the apex. Female. Dorsum mat; head rugose and finely punctate; pronotum with a coarse network, with strong, dense dots, especially laterally. Punctation of elytra dense, coarse in the posterior third; 10 longitudinal grooves reaching the posterior third; first groove shortened posteriorly; outer grooves slightly broader. Anal sternite with an indentation at the end, flanked by a few sharp wrinkles. There is rarely a second form of female, with smooth elytra and without grooves (ab. exspectatus). Length 24—30 mm. Distribution. USSR: Western Ukraine, Black Sea coast of Caucasus. Europe, especially Western Europe, Mediterranean. Ecology. Marshy, little transparent water bodies. 3. Dytiscus (Macrodytes) sharpi Wehncke. Wehncke, 1875, Stett. Ent. Zeit., XXXVI:500; Sharp, 1880—1882:635; Régimbart, 1899:312. Closely related to D.semisulcatus; process of the hind coxae of the same form and coloration also the same, but lateral border of pronotum and elytra markedly broader; body more broadly oval; male with markedly different punctation.on the elytra: punctation also fine, but much sparser in the anterior half; punctation coarse, irregular, sparser in the posterior third, dots forming groups in some places so that the surface appears rugose. The single female described by Régimbart has rudimentary grooves on the elytra; only inner 4 or 5 grooves deep near the base; other grooves only weakly marked (aberrant specimen?). The two specimens at my disposal are unfortunately males. The distinctive character of this species is that the small suckers of the male are markedly larger than in D.semi- sulcatus. Length 28—30mm. Distribution. Japan. 4. Dytiscus (Macrodytes) validus Всё. Régimbart, 1899:311. This species differs from the other species of the genus in its compact body. Coloration resembling that of D.semisulcatus; lateral border of pronotum and elytra broader; process of hind coxae more narrowly rounded, resembling that of D.pisanus. Elytra of male more oblong, angle between pronotum and elytra clearly marked; sides of pronotum slightly rounded; fore and mid tarsi strongly developed, broad. Elytra of female more oval; sides of pronotum more rounded; reentrant angle between pronotum and elytra sharper; grooves of elytra resembling those of D.pisanus, but outer grooves slightly broader than in О. pisanus, and not resembling those of D.semisulcatus. Sculpture of ventral surface stronger, especially at sides of metathorax. Length 28—29 mm (after Régimbart). Distribution. Japan. 347 326 *5. Dytiscus (Macrodytes) dimidiatus Brgstr. Bergstrasser, 1778, Nomencl. Ins. Hanau, 1:33; Gschwendtner, 1938:8; Guignot, 1947:242; ab. mutinensis Fiori, 1881, Boll. Soc. Ent. Ital., хШ:276. Oval; oblong; elytra slightly broader behind middle, slightly oblique and slightly rounded posteriorly; greenish black; clypeus, a small indistinct angular spot on the frons, broad lateral border on pronotum, narrow border at anterior margin of pronotum and the very narrow border at posterior margin of pronotum, the broad lateral border of elytra, which tapers posteriorly, reddish yellow; venter reddish yellow; middle and margin of metathorax, hind coxae and abdominal sternites (except first sternite) blackish brown. Pronotum markedly broader than long, but still rather long in the male. Prothoracic process broad between fore coxae, convex, slightly broader at the end, with a sharp rim, produced into a spine. Lateral wings of metathorax very narrow. Processes of hind coxae narrowly rounded at the apex; thepartof the processes from the constriction to the apex markedly longer than broad; trochanters markedly longer than broad. Male. Dorsum and venter shining. Punctation of elytra very fine and sparse in the anterior half, markedly coarser and denser in the posterior half, with coarse dots only near the apex. Pronotum with pointed posterior angles. Anal sternite with a weak indentation at the end, flanked by several coarse dots. Female. Dorsum slightly shining. Punctation of elytra much stronger and denser than in male; elytra with a fine network at the base and behind middle; loops of network broader toward apex of elytra. Grooves short, reaching only slightly beyond middle of elytra; inner grooves Slightly shorter; bottom of all grooves reddish. Pronotum with less pointed posterior angles. Anal sternite raised like a roof at the apex and indented; its sides with wrinkles and coarse dots. There is rarely a form of female without grooves on the elytra (ab. mutinensis). Length 32—39 mm. Distribution. European USSR (except in the north), Transcaucasia, Middle Asia. Central Europe, Asia Minor, Syria. *6. Dytiscus (Macrodytes) delictus Zaitz. Zaitsev, 1906, Russkoe Entomologicheskoe obozrenie, VI:28; Gschwendtner, NO BS tales Oblong-oval; form of body as in D.pisanus, to which it is closely related; elytra markedly broader behind middle, broadly rounded posteriorly. Convex; clypeus and border around whole pronotum broad laterally and less broad at anterior and posterior margin, but broader in the middle; broad lateral border of elytra (which tapers apically) yellow; a distinct angular spot on the frons, which often reaches the clypeus, reddish. Venter reddish yellow; middle of metathorax, margin of lateral wings, episterna and hind coxae dark, anterior and posterior margin of abdominal sternites also dark; abdominal sternites 2—3 with blackish spots on each side of middle in the anterior half. Processes of hind coxae as in D.pisanus, narrowly rounded 5917 348 321 at the apex; hind trochanters pointed, but not produced into a spine as in D.pisanus. Male. Dorsum shining. Punctation of elytra sparse, marked only behind middle, markedly coarser and denser apically. Anal sternite with a stronger indentation than in D.dimidiatus, and with a few dots lateral to the indentation. Female. Dorsum slightly mat. Elytra smooth, without grooves; rows of dots more distinct than in the male; network distinct also in the anterior third; like the punctation, it passes into a coarse network near the apex. Anal sternite with a deep indentation in the middle, flanked by sharp wrinkles. (This species has possibly also a form of female with a grooved elytra.) Length 29—30 cm. Distribution. USSR: Amur Area, Maritime Territory (large series). 7. Dytiscus (Macrodytes) pisanus Cast. Castelnau, 1834, Etud. Ent.:98; Gschwendtner, 1938:12; Guignot, 1947:244; female ab. nonsulcatus Zimmermann, 1917, Arch. Naturgesch., 83 A, 12:227; idem, 1919:233.— ibericus Rosenhauer, 1856, Thiere Andal. :47. Closely related to D.delictus, with similar narrow rounded ends of hind coxae, but hind trochanters produced into a short spine, and dark area of ventral surface usually more weakly marked. Punctation of elytra and network more distinct; indentation at apex of anal sternite of male less deep and dots lateral to it weaker; female with grooved elytra, but there is also a rare form of female with smooth elytra (ab. nonsulcatus); grooves very narrow; outer grooves distinctly broader and deeper. There are rarely specimens with a narrower linear border at anterior and posterior margin of pronotum and with smooth elytra (subsp. ibericus). Length 28—34 mm. Distribution. Western Mediterranean, Northwest Africa, rare in western Yugoslavia and Greece; this species possibly occurs in Russia, at the Black Sea coast of the Caucasus. *8. Dytiscus (Macrodytes) marginalis L. Linnaeus, 1758, Syst. Nat., ed. X, 1:411; Gschwendtner, 1938:15; Csiki, 1946:687; Guignot, 1947:243; ab. conformis Kunze, 1811, Neue Schr. Nat. Ges. Halle, 11:58; female ab. semicostatus Reineck, 1921, Deutsch. Ent. Zeitschr. :116. Broadly oval; pronotum broad and short (especially in the male); elytra broader behind middle (especially in females with grooved elytra); clypeus, frons near eyes, border at inner margin of eyes and sharp angular spot on frons reddish yellow; broad border around whole pronotum and lateral border of elytra yellow; venter reddish yellow or brownish; metathorax usually slightly dark; margin of hind coxae and abdominal sternites rarely slightly dark, but there are no spots on the sternites. Network and punctation of elytra as in D.pisanus. Female with smooth elytra (ab. conformis) more common than females with grooved elytra; there is 349 328 rarely an intermediate form in which the grooves are only slightly marked, or some of them slightly and partly deeper (ab. semicostatus). Pro- cesses of hind coxae forming a distinct short angle at the apex, not rounded; inner margin convex or almost straight, never concave; spine at end of trochanter sharp. Length 27—35 mm. Distribution. European USSR: (except Crimea), Middle Asia, Siberia, Northern and Central Europe, North America; the record from Japan apparently refers to D.czerskii, зр. п. *9. Dytiscus (Macrodytes) persicus Wehncke. Wehncke, 1876, Stett. Ent. Zeit., XXXVII:52; Sharp, 1880—1882:640; Peschet, 1914, Ann. Soc. Ent. Fr., LXXXIII:231; Gschwendtner, 1938:14. In spite of the different interpretations, I consider this species as valid, but closely related to D.marginalis (it is the vicarious species in the south of the European USSR, Transcaucasia and Iran); D.persicus is more closely related to D.marginalis than to the western D.pisanus. It differs from D.marginalis mainly in its smaller size, narrower body, and darker ventral surface (as in D.pisanus, the following areas are black: greater part of metathorax, large lateral spots on sternites 2—3, and smaller spots on the other sternites); processes of hind coxae markedly shorter and broader, not rounded at the end as in О. pisanus, but forming a more obtuse angle than in D.marginalis. The grooved form of female apparently predominates as only one specimen had smooth elytra ina large series with grooved elytra. Comparison of this specimen with the smooth form of D.marginalis showed that it has a finer and sparser punctation in the anterior two-thirds of the elytra. Length 29—31 mm. Distribution. USSR: southern coast of Crimea, Dagestan, Trans- caucasia. Northeastern Turkey, Iran. *10. Dytiscus (Macrodytes) czerskii Zaitsev, sp. п. This species is intermediate between D.marginalis and D.pisanus and is possibly a vicarious species of D.marginalis inthe Far East. It differs from D.marginalis inits larger size, the broader body of the male and the more compact body (females smaller and narrower than males); processes of hind coxae blunt, markedly shorter, forming an obtuse angle which is rounded at the apex; yellow border around pronotum slightly broader; grooves onelytra as long asin D.marginalis; however,as the elytra are longer than in D.marginalis, the smooth area in the posterior half behind the grooves occupies a larger area thanin D.marginalis, and is markedly less densely punctate. There is no female with smooth elytra ina large series of females; all females have grooved elytra. Angular spot on frons very distinct, large; its ends are connected with the yellow clypeus; yellow orbital border at inner margin not passing to the upper margin. Coloration of ventral surface asin D.marginalis. This species differs from D.delictus (which occurs together with it) in the form of the body, the larger size, the different form of the process of the hind 350 329 сохае, the broader border at the anterior and posterior margin of the pronotum, the grooved elytra of the females, etc. Length 31—37 mm. Distribution. ‘USSR: Maritime Territory (Vladivostok, Khanka Lake, Novovladimorovka, Kamen' Rybolov, Sidemi, 13 males, 16 females, April— August 1879—1913, A. I. Cherskii, Dyukin, Tarabarov). Japan (Hakodate, Albrecht) 1 female; Sharp's record of D.marginalis L. from Japan probably refers to this species. *11. Dytiscus (Macrodytes) lapponicus Gyll. Gyllenhal, 1808, Ins. Suec., 1:468; Gschwendtner, 1938:16; Csiki, 1946:688; ab. disjunctus Camerano, 1880, Boll. Soc. Ent. Ital., ХП:120; female abyseptent rionalis Gyllenhal, 1827, Ins. Suec., 1V:373: This species differs from all other species of this genus in the strong reduction of the black coloration on the dorsal surface: the yellow coloration on the head passes from the clypeus far posteriorly beyond the sutural line; the black coloration on frons and vertex are strongly reduced and show a tendency to form paired spots; usual angular yellow spot on frons markedly extended laterally; circular border of pronotum very broad, almost as broad anteriorly and posteriorly as the short and narrow black stripe on the disc; this stripe is sometimes divided into 3 spots (ab. disjunctus Cam.); lateral border of elytra broad throughout, but not reaching the apex; scutellum yellow; elytra brown or blackish brown with a greater or smaller number of yellow longitudinal lines of the background which are rarely reduced. Venter with a dark area on metathorax and with spots at sides of abdominal sternites. Oblong oval, very narrow, narrowly rounded posteriorly. Pronotum of female narrower, longer, with an indentation before the posterior angles (they are therefore more pointed than inthe male). Prothoracic process broad. Processes of hind coxae produced into a long spine. Elytra of female usually grooved, rarely smooth (ab. septentrio- nalis). Male shining; female slightly mat. Grooves of elytra about four- fifths as long as elytra; inner grooves longer than outer; bottom of grooves reddish yellow. Length 24—28 mm. Distribution. Northern and central European USSR, to the Kiev, Voronezh and Tambov regions; subalpine zone of Transcaucasia; north- western Siberia. Distributed from the extreme north of Eurasia to the Alps and Carpathians. Canada. The form D.disjunctus Cam. is not a characteristic subspecies of the mountains of Central Europe; it is simply a psychrophilic form, as I have several such specimens from Leningrad. *12. Dytiscus (Macrodytes) circumflexus Fabr. (Figure 66) Fabricius, 1801, Syst. Eleuth., 1:258; Gschwendtner, 1938:19; Csiki, 1946:688; Guignot, 1947:245; female ab. dubius Serville, 1830, Fn. Fr. :90; (not Gyll., 1827, nom. praeoccupatum!). Oblong-oval; very narrow posteriorly; clypeus and spot near eyes and sharp angular spot on frons reddish yellow; broad lateral border, broad 351 border at anterior margin, less broad border at posterior margin of pro- notum and scutellum yellow; lateral border of elytra broad, usually forming ; a spot with dark speckles and dashes at the apex. Venter either slightly ) dark as ш D.marginalis, rarely with spots as in D.lapponicus. Head markedly larger than in the other species; pronotum shorter and broader; its lateral margin not straight; a broad, distinct inden- tation before the posterior angles. Punctation of elytra almost absent in anterior half, distinct in the posterior half; it consists of large irregular dots at the apex; punctation more distinct in the female. Processes of hind coxae produced into a long spine at the end. Venter of male shining, almost mat in the female because of the coarser and denser punctation. Elytra of female usually smooth; there are rarely females with grooved elytra (ab. dubi- us). Length 27—33 mm. Distribution. European USSR, from the Leningrad (?) and Yaroslavl regions to the south, Transcaucasia, south of West Siberia, northern Kazakhstan. Central and southern Europe, North Africa, Iran, Asia Minor and Middle Asia. FIGURE 66. Dytiscus cir- Ecology. It occurs in stagnant or brackish cumflexus Fabr. water. *13. Dytiscus (Macrodytes) thianschanicus Gschw. Gschwendtner, 1923, Arch. Naturg., 89:107; idem, 1938:21. This species closely resembles D.circumflexus in coloration and punctation, but dorsum markedly flatter; pronotum as long as in D.cir- cumflexus but much narrower in the original specimen (according to the author; however, it is not narrower than in D.circumflexus ша! specimens of the series at my disposal, or even broader; posterior angles slightly less pointed; lateral margin without indentation, straight. Elytra regularly broadened from the base posteriorly to the posterior third, where 330 they are broadest; they then taper ina broad oval form and are slightly oblique, i. e., form of body different fromthat of D.circumflexus. Coloration of dor- sum andventerasin D.circumflexus; spots onsides of abdominal sternites distinct. The 3 rows of dots on elytra, especially the inner row, sharply marked; there are interrupted rows of minute dots between them in the posterior half which become denser and coarser toward the apex and mixed with large scattered dots. Processes of hind coxae slightly shorter; their end (after the jagged place) less narrow or markedly broader; their angles less narrow. The series contains two females with smooth elytra and 2 females with grooved elytra. Punctation of the elytra in the smooth females more distinct in the anterior half than in D.circumflexus, markedly coarser and denser in the posterior half; in the grooved form, the grooves reach markedly farther posteriorly and the smooth field in the posterior third is therefore smaller. Length 31—34mm. 352 331 Distribution. Described from a single male (which is in my opinion aberrant with regard to width of pronotum) from Tadzhikistan (Yakhsu Valley, Kulyab District). I consider a large series from Karategin, Tadzhikistan (August 1889, Grumm-Grzhimailo) as belonging to this species. *14. Dytiscus (Macrodytes) latro Sharp. ?Sharp, 1880—1882:644; Gschwendtner, 1938:21.— sta dleri Gschwendtner, 1922, Wien. Ent. Zeitg., XXXIX:93.— ?sinensis Feng, 1935, Peking Nat. Hist. Bull.,9:182. This species closely resembles D.circumflexus in punctation and coloration; it differs from it in form of the body: it is slightly more convex; sides of elytra and pronotum forming a continuous curve, without reentrant angle; maximal width slightly behind middle of elytra; head smaller; body, especially pronotum, narrower anteriorly. Rows of dots on elytra sharper; posterior angles of elytra less obtuse. Punctation of elytra markedly larger and denser near the apex thanin D.circumflexus. Females not known to myself or Gschwendtner; the species was described from a single female with smooth elytra; Sharp states that this female differs from the smooth females of D.circumflexus and D.dauricus inthe more distinct punctation on the elytra, which is more regular, coarser and reaching farther toward the base than in D.circumflexus; the process of the hind coxae is intermediate in length between D.dauricus and D.circumflexus. Length 27-32mm. (The status of this species seems not clear.) Distribution. USSR: Transbaikalia (after Sharp), Maritime Territory, Novovladimirovka, Vladivostok, Kamen'-Rybolov, 4 males, Cherskii). Northeastern China (Manchuria — Sharp). D.sinensis Feng. from Szechwan is insufficiently described; Feng considers it as related to D.circumflexus and D.latro; it is possibly identical with D.latro. 15. Dytiscus (Macrodytes) distans Feng. Feng, 1936, Peking Nat. Hist. Bull., 11:14; Gschwendtner, 1938:21. This species differs from D.latro as follows: larger size, different coloration, differing from D.sinensis ш the broader and thicker body and also in coloration. Dorsum dark, reddish brown; spots and border of pro- notum and elytra brownish; venter brown; wings of metathorax, hind coxae and posterior margin of sternites dark; spots at sides of sternites 2—3 sometimes indistinct. If there is a red border onthe inner margin of the eyes (this is not stated in the description), it would be difficult to distinguish this species from dark specimens of D.dauricus. Length 37mm (after Gschwendtner). Distribution. North China (Manchuria), Mongolia. *16. Dytiscus (Macrodytes) circumcinctus Ahr. Ahrens, 1811, Neue Schr. Nat. Ges. Halle, 1:67; Gschwendtner, 1938:22; Csiki, 1946:689; Guignot, 1947:244; female ab. flavocinctus Hummel, 1823, Essais Ent., П1:17; Gschwendtner, l.c. 353 332 More broadly oval than D.circumflexus, narrowing anteriorly and posteriorly almost to the same extent; convex; male more shining than female; clypeus, a narrow border around eyes and a sharply marked angular spot on the frons which is closed anteriorly, reddish yellow; borders of pronotum and elytra as in D.circumflexus; posterior half of scutellum reddish; venter not dark. Network of elytra especially well marked in the posterior half in both sexes. Punctation of dorsum distinctly finer and sparser than in D.marginalis and Ъ. с1тгеим 1 ехив. Pro- thoracic process slightly shorter than in D.circumflexus. Processes of hind coxae pointed but much shorter than in D.circumflexus. Punctation of dorsum of female, especially on sides of pronotum coarser and denser than in male; female therefore almost mat. Punctation in posterior third also coarser. Females with smooth or grooved elytra (ab. flavo- cinctus) occur in the same numbers; grooves slightly longer than in D.marginalis. This is the commonest species of the genus. Length 32—36 mm. Distribution. European USSR. Transcaucasia (one specimen from Borzhomi), Siberia to Kamchatka. Northern and Central Europe; North America (Alaska, Canada). *17. Dytiscus (Macrodytes) dauricus Gebl. Gebler, 1832, Nouv. Mém. Moscou, П:39. — ventralis Mochul'skii, 1855, Etud. Ent., V:79.— frontalis Mochul'skii, 1859, Bull. Soc. Nat. Moscou, XXXII, 11:489.— var. obscurus Gschwendtner, 1922, Wien Ent. Zeitg. :93. Markedly less convex than D.circumcinctus; yellow border around eyes present only at inner margin and not at the outer margin; it is usually contiguous with the ends of the angular, open, frontal spot; processes of hind coxae longer than ш D.circumcinctus; their ends produced into a narrow point which is shorter than in D.circumflexus but longer than in D.circumcinctus. Scutellum dark; circular border of pronotum as in D.circumcinctus; venter very dark; middle of metathorax, posterior margin of hind coxae and anterior margin of abdominal sternites black; large black spots on each side of middle of sternites 2—3; spots smaller on sternites 5—6; anal sternite almost completely dark. Females with smooth elytra apparently more common than females with grooved elytra; grooves much longer than in grooved females of D.circumcinctus, and also more coarsely and densely punctate. Length 28—33 mm. Distribution. USSR: Transbaikalia, Yakutia, Maritime Territory. North China (Manchuria), ?Japan (Gschwendtner). North of North America. The single specimen examined is from Japan (Nemuro, Hokkaido); its venter has a dark area as in D.dauricus, but processes of hind coxae as short and broad as in D.circumcinctus; it differs from both species in the absence of a red border near the eye, even on the inner margin (only usual spot at lower angle of eye markedly enlarged); angular spot on frons small, closed; elytra, especially in the posterior third, more finely and sparsely punctate. This is undoubedly a different species and probably was 354 the reason for the record of D.dauricus from Japan Бу Gschwendtner. Until further specimens are available, it seems premature to name it (obscurus Gschw.). 15. Tribe CYBISTERINI Sharp, 1880—1882:700; Gschwendtner, 1938:24; Csiki, 1946:689; Guignot, 1947:247. This tribe contains the largest species of the family (to 50mm). Hind legs short and broad; hind tibiae almost as broad as long; outer terminal spur very thick, almost 2—3 times thicker at the base than the inner spur. Adhesive disc of fore tarsi of male transversely oval, with 3 or 4 rows of small suckers. Pronotum and elytra of females with small oblique dashes in some species. The tribe contains 5 genera, only one of which is represented by a few species in the Palearctic Region. 38. Genus Cybister Curt. Curtis, 1827, Brit. Ent.,1V:151; Gschwendtner, 1938:24; Csiki, 1946:690; Guignot, 1947:247. Type species: Dytiscus lateralimarginalis Deg. Body oval, more or less broad, often broader behind the middle. Head relatively small; clypeus long, with distinct anterior angles and a deep pit near each. Pronotum usually short, without lateral ridge, with pointed anterior and posterior angles; pronotum closely contiguous to base of the elytra. Whole disc of pro- notum with fine or coarse punctation and with a delicate network. Punctation on elytra usually absent. Epi- pleura broad, forming a sharp rim; this rim turns upward and forms a lateral ridge; an irregular row of dots is near it on the inside of this ridge. Usual 3 longi- tudinal rows of dots on elytra well marked; inner row with dense dots; outer row with sparser dots. Venter markedly shining, with a very fine network. Prothoracic process broad, lanceolate, with pointed end. Lateral wings of metathorax tongue-shaped. Fore and midlegs С | | СС ———y | © = wer - | = FIGURE 67. Cybister small, unlike the hind legs. lateralimarginalis The larva has been described only for C.laterali- Deg., Larva. marginalis Deg. (Figure 67). There are about 80 species inthis genus; they are distributed throughout all tropical and subtropical regions (except South / America); only a few species occur in the temperate zones. 355 Key to Species 1 (4). Dorsum greenish black, without yellow lateral border. (3). Head with coarse, dense dots; pronotum with coarse, scattered dots о 1. С. brevis Aubé. 3 (2). Head and pronotum with very fine or hardly marked punctation ое ал, 2. С. sugillatus Er. 4 (1). Dorsum greenish black or olive brown; pronotum and elytra always with a more or less broad yellow lateral border. 5 (8). Yellow lateral border of elytra reaching to the lateral margin and passing to the epipleura. 6 (7). End of hind coxae in form of short diverging lobes separated by ам афера о о а evan har ates ЖЗ. C.tripunctatus (Oliv.). 7 (6). End of hind coxae obliquely truncate; indentation between them Wedlcla паке а 4. C.lewisianus Sharp. 8 (5). Yellow lateral border of elytra not reaching lateral margin; a black stripe passing into a ridge outside the lateral border. 9 (10). Hind tarsi of female with natatorial hairs only on the ventral margin.» Hind сохае produced intova spine at thevend) т.е т 5. С. limbatus (Fabr.). 10 (9). Hind tarsi with natatorial hairs оп both margins in both sexes. Mid tarsi of male without tufts on ventral side. 11 (12). Smaller (29-37mm). Lateral border of pronotum and elytra moderately broadi+ Venter slightly, darks ооо eee с URN Ee eae, Иа *6, C.lateralimarginalis (Deg.). 12 (11). Larger (35—40 пт). Lateral border of pronotum broad. Middle Ofmetathorax and- sutures Of sternites dank in, и 54 а ы *7, С. japonicus Sharp. 1. Cybister brevis Aubé. Aubé, 1837, Spec. Col., VI:98; Régimbart, 1899:355; Gschwendtner, 1938:30. Broadly oval; elytra very broad behind middle. Labrum and clypeus reddish yellow on each side of middle; a reddish yellow spot near apex of elytra; sternites 2—4 with a small reddish spot on the sides; fore- and mid- legs reddish yellow; femora (except apex) and mid tarsi dark brown; hind legs black. Head with coarse, dense dots; dots finer before clypeus, absent on the clypeus itself; punctation of pronotum fine and sparse; stronger and denser laterally, but weaker than on the head; wrinkles also present in some places; sculpture usually stronger in the female, but elytra smooth as in male, without striation in the anterior half. Prothoracic process slightly broader and shorter thanin C.sugillatus. Length 20—23 mm. трет Бытов. Japan, 2. Cybister sugillatus Er. Erichson, 1834, Nova Acta Halle, XVI:227; Régimbart, 1899:355; Gschwendtner, 1938:30. 5917 356 334 The species differs from C.brevis in the more oblong body, the narrower pronotum, the absence of coarse punctation on the head, the clypeus which is of the same color as the other parts of the head (but labrum yellow); lateral margin of pronotum and sometimes also sides of elytra diffusely reddish; yellow spot near apex of elytra rarely distinct; abdomen often brownish; legs black, knees reddish. Length 18—23 mm. Distribution. Ceylon and Indochina to North China and Japan. *3. Cybister tripunctatus (Oliv.). Olivier, 1795, Entom., Ш м. 40:14 (Dyt iscus); Régimbart, 1895:210; idem, 1899:351; Gschwendtner, 1931, Ent. Blatt.,27:65; idem, 1938:32; subsp. africanus Castelnau, 1834, Etud. Ent.:99; Gschwendtner, 1931, idem, subsp. gotschi Hochhuth, 1846, Enum. Carab. Hydr. Cauc. :21; asiaticus Sharp, 1880—1882:731; Gschwendtner,1.c.; subsp. orien- talis Gschwendtner, 1931, Ent. Blatt., 27:99, idem, 1938:32. Widely distributed in the Tropics and adjacent parts of the temperate zones (to about 40° М. lat.); a polymorphic species with a number of geographical forms which are not quite constant and connected by transitions in border regions; Gschwendtner (1931, 1938) described 7 subspecies, 3 of which occur in the Palearctic Region. Only one, possibly two sub- species occur in the USSR. ; *3a. Cybister tripunctatus gotschi Hochh. Dorsum olive green, sometimes with brown or bluish iridescence; labrum and clypeus to the suture and frons before eyes yellow; frontal stripe slightly extended posteriorly near the eye; sides of pronotum with a narrow yellow border which curves slightly to the anterior margin; yellow lateral border of elytra 1.5 times as broad as border of pronotum, tapering near the apex of the elytra; venter light brown to reddish yellow, darker in the middle; sternites 3—5 with a small yellow spot in the posterior angle; fore- and midlegs reddish yellow; hind legs reddish brown. Body oblong oval, markedly broader behind middle, convex; pronotum very short. Pro- thoracic process short, less convex, broader in the male, narrower, more convex inthe female. Male. First 2 segments of mid tarsi with dense, short, reddish hairs forming a brush which is broader posteriorly on the first segment; it is narrower and oval оп the 2nd segment. Female. Elytra usually smooth аз in the male; sometimes with dashes or wrinkles anteriorly. Length 23—28 mm (specimens from Asia Minor and Transcaucasia are usually smaller than specimens from Middle Asia). Distribution. Transcaucasia, Southwest Asia, Middle Asia; this form is replaced by subspecies orientalis further east; it is replaced by the subspecies C.tripunctatus similis Rég. in India. 357 3b. Cybister tripunctatus orientalis Gschw. Differing from subspecies gotschi in the more oblong body which is also narrower anteriorly; dorsum less convex; venter darker; lateral border on elytra narrower, 1.5 times as broad as border of pronotum., 335 Distribution. Baluchistan, Mongolia, China, Philippines. This form probably also occurs in the USSR (Far East). D.tripunctatus africanus Cast., which is distributed throughout Africa and in the Mediterranean part of Europe, apparently does not occur east of the Balkans. 4. Cybister lewisianus Sharp. Sharp, 1873, Trans. Ent. Soc. London:46; Régimbart, 1899:350; Gschwendtner, 1938:35. Oval; markedly shorter and broader behind the middle than C.tri- punctatus; more convex and compact. Surface of elytra often with flat vesicular swellings on a larger or smaller area. Lateral border of elytra slightly broader near shoulders, gradually tapering posteriorly; there is often a diffuse subapical yellow spot; frontal yellow stripe near eyes extending posteriorly almost along the whole orbit. Venter more or less reddish yellow, lighter laterally; hind legs blackish brown; apex of hind femora and knees reddish. Processes of hind coxae not forming lobes, but fused to the apex; only a small indentation at the apex. First two segments of mid tarsi of male with a row of short setae. Elytra of female smooth, without striation. Length 21—24 mm. Distribution. China, Japan, Vietnam. 5. Cybister limbatus (Fabr.). Fabricius, 1775, Syst. Ent.:230 (Dytiscus); Régimbart, 1899:342; Gschwendtner, 1938:39. Broadly oval; maximal width of elytra almost in the middle; markedly convex; yellow lateral border almost three times as broad as border of pronotum, always distinctly widened into a hook near the apex. Venter reddish yellow. Apex of hind trochanters short and truncate. Claws of fore tarsi of male long, slender, of distinctly different length. Elytra of female almost completely covered with long, connected dashes; pronotum with wrinkles on a larger or smaller area. Length 33—39 mm. Distribution. Southern Asia to China and Japan. *6. Cybister lateralimarginalis (Deg.). De Geer, 1774, Mem. hist. ins.,IV:396 (Dytiseus); Gschwendtner, 1938:42; Csiki, 1946:690; Guignot, 1947:247; female ab. jordanis Reiche, 1846, Ann. Soc. Ent. Fr., (3) 4:637; subsp. chaudoiri Hochhuth, 1846, Enum. Carab. Hydroc. Cauc.:213.— ?tataricus Gebler, 1830, in: Ledeb. 358 336 Reise, 11:64; ab. hedini Zaitsev, 1908, Ezhegodnik Zoologicheskogo myzeya Akademii Nauk, XIII:419; Falkenstrom, 1933, Ark. zool.,27 A, 1:20; subsp. ponticus Sharp, 1880—1882:748; Gschwendtner, 1938:42. Oblong-oval; strongly broadened behind middle; very narrow apically; flat (especially females). Yellow lateral border of pronotum usually moderately broad, slightly broader on the elytra and slightly curved inward at the shoulders; uniformly broad at the lateral margin, tapering in the posterior third; it forms a diffuse hooklike subapical spot. Venter reddish yellow; middle of metathorax brownish; epipleura reddish yellow, usually olive green in the middle. Mid tarsi of male without suckers. Epipleura of female broadly turned up behind shoulders; lateral margin therefore markedly indented; epipleura flat from first sternite onward, very broad posteriorly. Elytra smooth near the apex, along sides and often also along suture; other surface with dense, long, longitudinal dashes; striated surface sometimes reduced to a small area in the region of the sides in the anterior third or striation rarely absent, so that the elytra are smooth (female, ab. jordanis); pronotum with dense wrinkles. Length 29—37 mm, width posteriorly 15.5—19 mm. Distribution. South of the European USSR. Transcaucasia, Middle Asia; greater part of Palearctic Region, except in the north. Toward the east, this species forms indistinctly defined local forms. The nominate form occurs in West Europe and the Mediterranean, except Asia Minor and Crimea, where it occurs together with other forms. 6a. Cybister lateralimarginalis chaudoiri Hochh. Differing from the nominate form as follows: body more oblong; slightly broader behind middle; elytra markedly more convex; outer angle of apex of hind femora almost rectangular, not produced outward (it is pointed and projecting in the nominate form); striation of elytra covering almost the _whole elytra in the female; this form differs usually in its greater length (to 37mm) but there are often also small specimens (33—34 mm) in Trans- caucasia. q Distribution. Asia Minor, southeast of European USSR, Middle Asia. China (Sinkian), Kashmir. In this subspecies I also place the lighter form, var. hedini Zaitz. (anterior and posterior margin of pronotum with a narrow yellow border and with a broader border on the elytra) from south- western Mongolia and Afghanistan (after Gschwendtner). Falkenstré6m wrongly considers this form as a different species. 6b. Cybister lateralimarginalis ponticus Sharp. Differing from the typical form of females as follows: larger (to 37mm), hind femora thicker, with the same straight outer angle as in subspecies chaudoiri, lateral border of elytra broader and more distinct apically, and absence of striation on the elytra; it also differs in the thicker epi- pleura. Described from a female from Mesopotamia. I have 3 specimens 359 4 3.817 from Mersin (Asia Minor), of which both females fit the description by Sharp; the only difference is that the elytra are not smooth but striated, and the border has the usual width; the male is a typical C.l.chaudoiri. *7, Cybister japonicus Sharp. Sharp, 1873, Trans. Entom. Soc. London:45; Régimbart, 1899:348; Gschwendtner, 1938:44. Differing from C.lateralimarginalis in its larger size; body narrower anteriorly, more rounded posteriorly, more convex. Sides of pro- notum markedly rounded. Yellow border of pronotum and elytra slightly broader and venter darker than ш C.lateralimarginalis. Apex of prothoracic process slightly shorter. Claws of midlegs of male thicker, less curved and more blunt. Anterior part of epipleura of female markedly broader and longer; posterior flattened part markedly narrower; elytra striated. Length 35—40 mm. Distribution. USSR: Maritime Territory. China, Taiwan, Japan. There is also a species from China (Kansu) — C.kansou Feng (Peking nat. hist. Bull. 11, 1936:13) the status of which is not clear and about which I know only from the data of Gschwendtner (1939). Elytra, with yellow lateral border before the apex and also with a broad yellow spot; venter yellow, except all sternites with a black border and metathorax dark. Length 32 mm. RAMEY Gay Rob NLDA DIAGNOSIS OF FAMILY Head deeply retracted into prothorax; eyes transversely divided into an upper and lower half; lower half completely displaced to the ventral side; antennae very short, 11-segmented; first segment bare, cup-shaped; second segment ear-shaped, with cilia on the free margin; following segments bare, forming a short, thick club; prothorax very short, with a narrow keeled process which does not reach beyond the fore coxae; mesothorax in form of a large rhomboidal plate; metathorax without precoxal sutural dashes; abdomen consisting of 7 sternites,the first 3 of which are fused; tarsi 5-segmented; segment of mid- and hind legs broadened into plates which form a fan and serve as paddles. Larva with 10 abdominal segments; last segment with 4 terminal, hooks; first 8 abdominal segments with one pair of lateral tracheal gills, 9th seg- ment with two pairs of tracheal gills. MORPHOLOGICAL REVIEW Small or medium-sized; head small, short and broad, retractible into pronotum, which can be bent down and straightened; lateral movements 360 338 restricted, but rotation possible. Clypeus transverse, tapering anteriorly, distinctly separated from frons only in the middle, suture indistinct laterally. Eyes completely divided, so that there is a dorsal and a ventral eye, which are broadly separated, facets small; ventral eye completely situated on the ventral side, situated nearer to the outer margin than the dorsal eye, but less displaced anteriorly than the dorsal eye. Dorsal eye rounded; ventral eye truncate at the upper margin. Antennae short, 11-segmented, situated in a large depression ventral to lateral margin of frons, behind base of mandibles; basal segment large, hemispherical, hollow, base of 2nd segment situated inside it; 2nd segment triangular, its form resembling an ear, and its margin with cilia; other 9 segments very short, closely contiguous, forming a club which is often laterally compressed but ends in a blunt spine or is truncate at the apex; last segments sometimes fused, so that the club apparently only consists of 5—7 segments. Labrum transverse or triangular, its anterior margin with long and dense hairs. Mandibles short and strong and covered by the labrum at rest; they have a broad apical indentation and two denticles; they are hollow on the inside and flat ventrally; they are curved with short cilia behind the denticle; there is a large blunt denticle in the middle of the inner ventral margin. Maxillae consisting of two lobes: a) the lacinia, which is large, triangular, flattened; its inner angle produced into a strong spine; inner margin of lacinia concave, sharp, with two tufts of strong setae; outer margin thicker, convex and without hairs; upper surface slightly concave; ventral surface almost flat; b) stipes either absent or weakly developed, small, bearing the short 4-segmented maxillary palp; last segment of maxillary palp ovoid or slightly axe-shaped, almost as long as the preceding three segments together. Mentum very large, broadly and deeply indented in the middle, with lateral appendages which are broadly rounded anteriorly and laterally. Ligula large, sclerotized, filling the whole indentation of the mentum, but not projecting outside it, truncate at the anterior margin or with a double indentation. Labial palps with 3 segments (but they appear 4-segmented); last segment large, blunt apically, or slightly axe-shaped, with blunt apex. Аз A> Ay FIGURE 68. Wing of Gyrinidae: С — costa; Си — subcosta; г — radial cell; В; and В, — Ist and 2nd radial veins; m — medial cell; М, and М, — medial veins; Ay, Ay, Аз, А} — anal veins. 361 339 Pronotum contiguous with base of elytra, transverse, tapering anteriorly; middle of posterior margin produced posteriorly into an angle; anterior margin indented on each side; anterior angles projecting, enclosing base of head. Scutellum (if visible) always small, triangular. Elytra oval (rarely more or less rhomboidal), rounded apically or truncate or produced into one or several spines, usually leaving end of abdomen uncovered; femoral depression passing below epipleura and episterna of mesothorax and below anterior part of episterna of metathorax, continuing to the epipleura. Behind the depression,inner margin of epi- pleura usually with a blunt denticle situated in a depression on the episterna of the metathorax (except in the genus Gyrinu s). Sculpture varying: either absent, or there are rows of dots or depressed grooves; elytra either bare or with more or less adpressed hairs, punctate or shagreened, mat or with a strong sheen. Wings (Figure 68) always developed; the type of venation resembles that of the Carabidae; the transverse fold is situated almost in the middle of the wing, and the cuneiform field onthe branches of the cubital veins is absen Prothorax (Figure 69) short, more or less raised in form of a keel in the middle. Coxal depressions of forelegs open, separated by the narrow pro- thoracic process. Epimera and episterna more or less distinctly separated; epimera covering base of mesepisterna. The well-developed mesothorax is situated in the same plane as the metathorax andformsa large rhomboidal plate. Its apex between the mid coxae is usually indented to contain the intercoxal process of the metathorax. Episterna and epimera distinctly delimited. Epimera contiguous with the mid coxal depressions at the corners formed by the lateral parts of meso- and metathorax. FIGURE 69. Gyrinus. Ventral side: FIGURE 70. Gyrinus. р — prothorax; tp — depression of trochanter Hanes: of prothorax; tms — same on mesothorax; tr — trochanter; f — cp — hind coxae; met — metathorax; femur; tb — tibia; a ,—a, — abdominal sternites. 1—5 — tarsal segments. 362 340 Metathorax much shorter than mesothorax, strongly indented by the mid coxal depressions so that lateral wings are formed, either in form of triangles or in form of very narrow structures which are broader only near the triangular episterna. Epimera covered by the epipleura, not visible. Fore coxae oval or spherical. Mid coxae usually divided by intercoxal processes of meso- and metathorax, situated obliquely to each other; they are narrower anteriorly, more or less triangular, hardly projecting outside the thorax. Hind coxae contiguous in the midline, large, reaching lateral margin of body, so that they separate the metathorax completely from the first sternite. Forelegs long (sometimes very long), prehensile; femora slender; tibiae thin near the base, slightly twisted, abruptly or gradually broadening toward the apex; tarsi markedly laterally compressed; tarsal segments closely contiguous; last tarsal segment longer than preceding segments, with 2 thin, curved claws. All segments of tarsi of male broadened, forming an adhesive plate; ventral side completely or partly covered with small rounded suckers. Mid- and hind legs natatorial (Figure 70), of characteristic structure: short, markedly flattened; trochanters large, trapezoidal, femora short, triangular, markedly broadened toward the apex, with a row of short, coarse setae at the outer margin. Tibiae articulating with femora at the outer angle, and usually even more broadened apically than femora; inner angle with two small spurs at the apex; outer angle with a group of long setae. Posterior side of tibiae with a triangular indentation at the apex in which the tarsi are situated; tarsi of unusual form, fan-shaped. First tarsal segment triangular, very large; two following segments short, broadened inward in form of thin plates; they fold like a fan together with the 4th seg- ment, under the first segment; 4th segment oblong longitudinally, not broadened inward, with long natatorial hairs at the outer margin; last segment very small, short. Both claws simple, small. Abdomen with 8 tergites and 7 visible sternites. Ten spiracles (2 thoracic and 8 abdominal spiracles), small, weakly developed, except the first pair on the first tergite which is of normal size. Male genitalia symmetrical: There are 1) two free elongate parameres with almost parallel sides; they are truncate or slightly rounded apically; inner margin more or less concave to accommodate the penis; 2) penis in form of an elongate triangular plate. Structure of genitalia little varying in the species. Larvae described for only 10 species of different genera. Head small, oblong; eyes consisting of 6 stemmata in a group; antennae 4-segmented; mouth closed; mandibles sword-shaped, perforated by a suction canal; maxillary palps 3-segmented; labial palps 2-segmented. Thorax 3-seg- mented; first two segments with sclerotized plates; 3rd segment membra- nous. Thoracic spiracles absent. Abdomen membranous, consisting of 10 segments, with 10 pairs of tracheal gills, one on each of the first 8 seg- ments, and 2 on segment 9; segment 10 with 4 sclerotized hooks which help the larva crawl on the substrate. Spiracles on segment 10 absent. Legs 6-segmented; tarsi with a short empodium and 2 claws. The larvae of different genera differ from each other in general only in the structure of the clypeus, the armature of the mandibles and the lacinia of the maxillae, the setae of the empodium and the length of the tracheal gills. 363 Pupa known only for 3 species of different genera (Gyrinus sub- striatus, Orectochilus villosus and Dineutes unidentatus). Head and thorax broad; abdomen tapering behind segment 3 or 4; dorsum and sides with hairs; venter bare. Abdomen 8-segmented; cerci small, conical, membranous. Only the first 4 pairs of spiracles visible: they are situated between tergites and pleura. BIOLOGY AND ECOLOGY Copulation takes place on the water surface and lasts 1—2 minutes; it takes place in spring or first half of summer. Oviposition takes place 2—3 days later. Eggs are laid in irregular rows or groups, on plants sub- merged in water, on stones ог inmoss. One to two weeks later, the larvae hatch; they hide among plants or in the mud, and it is therefore difficult to find them; they breathe oxygen dissolved in water with their tracheal gills. The food consists of live and dead animals; the larvae feed through the 341 suction canal inside the mandibles. Development of the larvae lasts 30—40 days. Pupation takes place in a cocoon on plants; the larva usually crawls out of the water and settles in 1 to 2 hours in a mud chamber under stones or in the sand on the bank. Seven to ten days later (usually at the end of August or beginning of September) the adults hatch and go into hibernation. A generation lasts one year. Adults live 1—2 years. Gyrinidae are equally well capable of flight, swimming and diving. They usually occur in groups on the water surface and either swim slowly in zigzag lines or are motionless. When disturbed, they make numerous short zigzags in various directions and with great speed; if in danger, they dive rapidly and hide among plants or in the mud. They move only with the mid- and hind legs; the forelegs act as a rudder. They fly rapidly, but not willingly. The method or respiration is not quite clear: air either enters just through the head, from the surface of the broadened first two antennal segments into a space between the anterior epipleura, and then proceeds to the first two pairs of spiracles, or air also enters through the posterior end of the body. Gyrinidae feed on insects, caterpillars and other live or dead matter accidentally found on the water surface; they are thus more scavengers than predators. Though the beetles have a mouth, they do not swallow hard particles; they suck the liquids of food dissolved outside the mouth by secretion of stomach contents; digestion thus begins outside, as in Dytiscidae. When caught or attacked by another animal, they secrete from the mouth an opalescent milky liquid with a sharp, disagreeable odor. This secretion probably facilitates diving and has a defensive function. Some species appear on the water surface only at night, remaining during the day under the surface in the mud (species of Orectochilu s). The Gyrinidae live mainly in quiet, calm, clean, stagnant or slowly running water; however, some species also occur in running water. The species of Orectochilus occur only in running or even rapidly running water. 364 SYSTEMATIC POSITION, EVOLUTION AND DISTRIBUTION OF THE FAMILY Gyrinidae were first separated as a family in Aubé's monograph (1836—1838); this has been generally recognized. The name Gyrinidae was given by Thomson (1860). The position of the Gyrinidae among the other families of Coleoptera is not clear: it has been considered as related to the Clavicornia (Houlbert, 1921), the Dryopidae and the Hydrophilidae (Sharp and Muir, 1914), or to the Dytiscidae (Ganglbauer, 1892; Hatch, 1926,etc.). Jeannel and Paulian (1944) have made a comprehensive revision of the taxonomy of Coleoptera. They determined the position of the family in the suborder Adephaga more exactly; the suborder is divided into three series (''suborders'' according to their terminology): Caraboidea, Dytiscoidea and Gyrinoidea. This seems 342 acceptable, as many data indicate that the Gyrinidae are an ancient branch which separated early from the common stock of Adephaga (Ochs, 1926/1927). The great age of the Gyrinidae is shown by the weak differentiation of external characters and the absence of specialized forms. The species of the tribe Gyrinini were the oldest form in the development of the family, 1.е., the genus Aulonogyrus which is a relict in Australia; this is also indicated by the more primitive form of the larvae of Aulonogyrus. GEOGRAPHICAL DISTRIBUTION The Gyrinidae reach the greatest numbers and diversity of species in the Tropics. There are about 600 species; less than 100 species are distributed in the Palearctic Region (mainly in its southern parts), the Mediterranean and Palearchearctic (Palearchean) subregions. The number of species decreases rapidly toward the north. Only one species, Gyri- nus opacus Sahlb., occurs in the Eurasian tundra. Twenty one species of Gyrinidae have been recorded from the USSR. Their distribution is as follows: The group of species of Mediterranean origin is the largest: Aulono- Cyrus comeinnwus:. Ki, Gyrinus uriniator: Ш: @ сари Мет., G.suffriani Scr.,G.substriatus Steph.,G.distinctus Aubé, and G.dejeani Br. They all occur in the south of the European USSR, in Transcaucasia and partly in Middle Asia. Orectochilus involvens Fald. belongs to this group (Transcaucasia and Asia Minor). Orectochilus zeravshanicus Glaz.is a Turanian species. A large group of species are Euro-Siberian, boreal, and occur in the northern part of Central Europe and in Siberia, Gyrinus minutus Fabr., G.paykulli Ochs,G.natator L.,G.marinus Gyll. andG.aeratus Steph. G.colymbus Er. which has not been found so far in Siberia, probably also belongs to this group. G.pullatus Zaitz. is endemic in East Siberia. Three species of the group of Sino-Japanese species have been found in the Maritime Territory: Gyrinus japonicus Sharp,Orectochilus punctipennis Sharp,Dineutes orientalis Modeer. This group will 365 probably be found more frequently in the Far East of the USSR, since it is represented in China and Japan by a large number of species (especially of the genus Orectochilus). Only one species,Orectochilus villosus (Mull.) is more widely distributed than the other species in the Palearctic Region. This species does not occur in the Sino-Japanese subregion; it shows a great tendency to form local (geographical) forms (subspecies). Bibliography Yakobson,G.G. Zhuki Rossii i Zapadnoi Evropy (Coleoptera of Russia and Western Europe), pp. 436—439. 1908. Zaitzev, Ph. Uebersicht der palaarktischen Vertreter der Gattung Gyrinus (L.). Reg.— Russkoe Entomologicheskoe obozrenie, Wolly 1: 23811907. Ahlwart,K. Gyrinidae.— In: Catalogus coleopterorum, ed. Junk- Schenkling. 1910. Csiki,E. Die Kaferfauna des Karpathen-Beckens, р. 561. 1946. Ganglbauer,L. Die Kafer von Mitteleuropa, p.518. 1892. Guignot, Е. Coléoptéres hydrocanthares.— In: Faune de France, Vol. 48:250. 1947. Hatch, М. The Morphology of Gyrinidae.— Michig. Acad. Sci., Vol. 7:311. 1926. Houlbert,C. Les Coléoptéres d'Europe; France et régions voisines, №0]. 1.11921. 343 Jeannel,R. апа В. Рац!1ап. Morphologie abdominale des Coléoptéres et systématique de l'ordre.— Revue fr. Ent., Vol. 11:65—110. 1944. Ochs,G. ' Die Dineutini. 2. Tribus der Unterfam. Enhydrinae. — Ent. Z. Frankf. a. M., Vol. 40:61, 112, 190. 1926—1927. Régimbart,M. Essai monographique de la famille des Gyrinidae, 1-ге p.— Annls. Soc. Ent. Fr., (6)2:379, 1883, 2-e p., Ibid.:121. 1886, 1-re Suppl. Ibid.:247. 1891, 2-e Suppl. Ibid.:663. 1907; 3-e Suppl. Ibid.:137. 1882. Sharp,D. The British Species of Gyrinus.— Entomologist's Mon. Mag., Vol. 25:128. 1914. Zimmermann, A. Der derzeitige Bestand der Gyrinidensammlung, etc.— Entom. Mitt., 6(4/6):135—170. 1917. Key to Subfamilies 1 (4). Dorsum moderately convex or flat, bare. Anal sternite flat, broadly rounded, bare, immovably connected with the preceding sternite. Mentum without denticle. Elytra almost always with longitudinal rows of dots or more or less deep grooves. 2 (3). Elytra with a rim along the suture. Lateral wings of metathorax very narrow, oblong, broader only laterally. Scutellum always Часа Sei LS SR I SN ON EN SUT A Neen ROR eA rar an 1. Gyrininae. 366 `3 (2). Suture of elytra without rim. Lateral wings of metathorax broadly | А В А О, А, 2. Enhydrinae. 4 (1). Dorsum markedly convex, completely or partly covered with a tuft of hairs. Anal sternite conical, pointed, with a longitudinal row of hairs in the middle and freely movable horizontally. Mentum with ©, ОЕ Ао а ока Mee cs Tes ee ae ve ee 3. Orectochilinae. Key to Larvae 1 (8). Anterior margin of clypeus with one or several denticles. 2 (7). Clypeus with 2—4 denticles. Head oblong, without neck; mandibles covered with a network. 3 (6). Only 2 denticles (genus Gyrinus L.). 4 (5). Last two pairs of tracheal gills 3 times as long as Lenore Oust ey ne 5 > 0 0 onlin RNS Ge oie oOo mmo Secor i eid orn Gyrinus marinus Gyll. 5 (4). Last two pairs of tracheae only twice as long as tergite9 ...... 35 БОНО Gh g Mahara SoG а Gyrinus substriatus Steph. Bae) SE ое CT SS Meee oe oe haa Huge Genus Aulonogyrus Rég. (Only*A.concinnus Kl. occurs in the USSR, but its larva has not been described.) 7 (2). Clypeus with only one denticle in the middle. Head more or less shorts neck present, mandibles without metwOrk вр sdk Gl tapes в PRP Бо satel sll areas Genus Dineutes Mac Leay. (Only*D. orientalis Mod. occurs in the Far East, but its larva has not been described.) 8 (1). Anterior margin of clypeus straight, without denticles ......... 2.8.5 0.07628. GON CaO ROR О С arse teeta Genus Orectochilus Lac. 1. Subfamily GYRININAE Régimbart, 1883:124; Ganglbauer, 1892:524; Guignot, 1947:250. Small (3—9 пил). Elytra with straight lateral margin, without spines and indentations; outer angle at apex of elytra more or less distinct or absent. Hind coxae large, square; their outer side slightly concave and as broad as the inner side, or slightly longer. Forelegs short, thick; tarsi of male moderately broadened, oval. The subfamily contains three genera, 2 of which are represented in the Palearctic Region. Key to Genera 1 (2). Upper eye projecting anteriorly only slightly farther than the lower eye, not reaching beyond the antenna. Pronotum without transverse grooves, but with a more or less distinct lateral, mat spot. Elytra with 10—11 more or less depressed longitudinal grooves (punctate or smooth) intervals between grooves with a delicate network and ECBO UME LAE ое и ries Caarehe 1. Aulonogyrus Rég. 367 2 (1). Upper eye projecting markedly more anteriorly than lower eye, reaching beyond the antenna. Pronotum with weak transverse wrinkles or grooves, but without lateral spots. Elytra with rows of dots; the inner rows may be less distinct or absent.. 2. Gyrinus L. 1. Genus Aulonogyrus Reg. Mochul'skii, 1853, Hydroc. Russie (nom. catal.); Régimbart, 1883:391; Ganglbauer, 1891:524; Guignot, 1947:251. Туре species: -Gyrinus 'concinnus. КЕ: Body oblong-oval, convex, often with a yellow lateral border on pronotum and elytra. Upper eye slightly projecting anteriorly beyond the lower eye. Pronotum without transverse grooves, but often with a dash at the anterior margin; this dash is rimlike; surface punctate and with a delicate network. Elytra with 10—11 more or less distinct longitudinal grooves, intervals between them with a network and often also punctate; outer grooves some- times indistinct. Epipleura broad, sharply tapering before the outer angle in which they end. Penultimate sternite always with three-lobed posterior margin. The genus contains more than 30 species mainly in the Ethiopian Region; 2 species occur in Polynesia and 4 in Eurasia; one of the latter species occurs in the USSR. Key to Species 1 (2). Venter reddish yellow; hind coxae and sternites (except last sternite) dark. Elytra obliquely truncate apically, with markedly mores rounded ощее ам 1444) nies *1. Au. concinnus (К1.). 2 (1). Venter black, with a bronze sheen; only epipleura and anal sternite reddish yellow. Elytra truncate apically ... Ач. striatus (Fabr.). *1. Aulonogyrus concinnus (К1.). Klug, 1834, Symb. phys.,1V:t.34,f,10 (Gyrinus); Ganglbauer, 1892:525; Csiki, 1946:695; Guignot, 1947:252; ab. opacinus Ragusa, 1889, Natur. Sic. :9; Guignot, 1947:252. 345 Ovoid, slightly oblong. Head green, with bronze iridescence; middle of head, pronotum and elytra dark green, rarely with violet iridescence or dark blue, rarely black and without sheen (ab. opacinus Rag.). Lateral margin of pronotum and elytra with a yellow border; epipleura yellow; middle of pronotum with broad copper or bronze colored band which is broader laterally; longitudinal grooves of elytra greenish copper colored. Grooves 7 and 8, and grooves 9 and 10 fused in pairs; intervals 8 and 10 therefore very narrow, equal, mat, shagreened, sometimes almost absent; other inter- vals more or less strongly raised. Elytra rounded apically; outer angle 368 almost completely absent; punctation in the posterior half more delicate and more scattered; there is also indistinct, dense, fine punctation; background smooth anteriorly, with a delicate network posteriorly. Venter and legs reddish yellow; mesothorax, hind coxae or, atleast, their outer part and abdomen, except anal sternite,dark bronze colored. Length 5.5—7mm. Male. Penis broad, slightly narrower apically; parameres slightly narrower in the 2nd third and markedly broadened toward the apex; apex obliquely truncate on the outer side; inner angle distinct; outer angle rounded; inner margin concave, outer margin convex in the apical third. Distribution. South of European USSR, Transcaucasia, Middle Asia, Pamir. Central Europe, Mediterranean, Iran, China (Sinkiang). The record of this species from the Amur (Ochs) is doubtful. Ecology. The species occurs in various types of water bodies, stagnant or running, puddles and small marshes. The larva has not been described. 2. Aulonogyrus striatus (Fabr.). Fabricius, 1792, Entom. syst.,1:203 (Gyrinus); Régimbart, 1883:135; Ganglbauer, 1892:524; Guignot, 1947:251. FIGURE 71. Aulonogy- FIGURE 72. Aulonogyrus striatus (Fabr.). Head of larva: rus striatus (Fabr.). é . : area lp — labial palps; man — mandibles; maxp — maxillary palps; an — antennae. 369 346 This species differs from A.concinnus inthe more oblong and less convex body, and the elytra which are truncate at the apex; outer angle of elytra distinct; inner and outer intervals on elytra raised in form of keels; outer grooves with more distinct rows of dots. Length 6—8 mm. Larva (Figure 71) broader and more flattened than in G.marinus, with short tracheal gills. Clypeus (Figure 72) with 4 denticles. Tracheal gills of first 8 abdominal segments shorter than width of segments; their length decreases gradually posteriorly; last two pairs of gills more delicate than the others and twice as long as segment 9. Pupa not described. Distribution. Mediterranean, mainly its western part. The records of this species from the USSR (Kiev Region, eastern Transcaucasia) are certainly erroneous. Ecology. It occurs in fresh and in brackish water. 2. Genus @уг:ни Е. Linneé, 1758, Syst. nat., ed. Х:412; Régimbart, 1883:141; Ganglbauer, LOA 2ia) GUISIOL ПЗЗ о Туре SoSeness Gay iti wis Wie welij@ ie IL, Body convex, with rounded, rarely with more or less parallel sides, almost always without a yellow lateral border. Upper eye projecting anteriorly markedly farther than lower eye. Pronotum with 3 transverse, incomplete grooves which are sometimes indistinct; anterior and posterior groove present only laterally; middle groove visible only in the middle; a deep dash delimiting a broad border at the anterior margin. Each elytron with 11 longitudinal rows of dots; inner rows sometimes less distinct or absent; outer rows often deeper than inner rows; last 2 or 3 dots of each row at apex of elytra form a truncate oval figure; epipleura broad, markedly narrowing before the outer angle. Penultimate tergite with straight posterior margin or with a weak indentation on each side. Penultimate sternite truncate or with a weak indentation on each side of the middle. The larvae of 2 species have been described (G.marinus and G.sub- striatus. This genus contains about 100 species, which are mainly distributed in the Holarctic Region. The genus is divided into 2 subgenera. Key to Subgenera 1 (2). Scutellum with a longitudinal keel. Mesothorax with a groove on the WhOLe нае sel wees cee mle: van ae 1. Subgenus Gyrinulus Zaitz. 2 (1). Scutellum without keel. Mesothorax with a groove only in the POSCEVIOGEPA ные sh. cca sete whe ee 2. Subgenus Gyrinus s. str. 2. Subgenus Gyrinulus Zaitz. Zaitsev, 1907:238; Guignot, 1947:253.— Gyradelphus Des Gozis, 1915, Misc. Entom., 22:209—216. 370 347 The subgenus consists of only 2 species (one in the Palearctic Region and one in North America). *1. Gyrinus (Gyrinulus) minutus Farb. Fabricius, 1798, Suppl. Entom. Syst.:65; Ganglbauer, 1892:526; Zaitzev, 1907:238; Csiki, 1946:701; Guignot, 1947:253. Oblong-oval; convex; slightly shining; blackish blue; sides with a bronze sheen; dorsum with a fine network. Clypeus with convex anterior margin, more or less bronze colored. Pronotum transverse, with a broad bronze- colored rim; anterior margin of pronotum markedly curved, with a rim which is indistinct in the middle; transverse grooves hardly visible; surface with weakly marked longitudinal dashes. Scutellum triangular, with a weak keel which is often marked only in the anterior half; it is sometimes reduced to atubercle. Elytra truncate apically; outer angle more or less rounded; lateral rim broad, slightly raised, reaching slightly beyond the outer apical angle; rows of dots with large, dense dots; inner rows weaker; apical, oval figure formed by dots distinct. Venter uniformly rust colored; abdomen and epipleura sometimes dark. Mesothorax with weak grooves. Legs yellowish. Length 3.1—4.6 тт. The smallest species of the genus. Distribution. Northern and central European USSR, Siberia to the Maritime Territory. Northern and Central Europe (partly also Southern Europe). 2. Subgenus Gyrinus s.str. Zaitzev, 1907:238; Guignot, 1947:253. Key to Species 1 (4). Venter uniformly yellow; sometimes reddish brown in the middle. 2 (3). Body ovoid, broad. Lateral border of elytra broad; elytra with coppery red or golden (sometimes markedly shining) longitudinal stripes; dorsum rarely mat, black. Inner rows of dots indistinct OEPA DSS В В И И Е *2. G.urinator 11. 3 (2). Body oblong-ovoid, less convex. Lateral border narrow. Dorsum bluish black, without shining stripes; sides of dorsum with a weak copper sheen. Inner rows of dots always distinct; intervals between rows finely punctate ... 11а. G.distinctus fairmairei Rég. 4 (1). Venter completely or partly dark, with a metallic sheen.. 5 (24). Epipleura of pronotum and elytra completely or partly reddish yellow, without metallic sheen. 6 (9). Body oblong; lateral margins almost parallel. Intervals between rows of dots on elytra smooth, without fine punctation. 7 (8). Body markedly oblong; sides of body almost parallel. Elytra bluntly rounded apically; outer angle rounded. Punctate groove at anterior margin of pronotum not passing along the margin as in the other species, but curved posteriorly at the sides. Mesothorax and anal sternite dark or reddish brown....... *3,. а. paykulli Ochs. 371 349 5917 Body less oblong; sides less parallel. Elytra truncate apically, with slightly rounded, distinct outer angles. Punctate groove at anterior margin of pronotum closely parallel to the margin. Mesothorax and anal sternite always reddish yellow ......... BE MUG: SIMS EE RROD ERR, SORA RSA IOs aE ae *4, G.caspius Mén. Body ovoid or oval. Intervals between rows of dots on elytra smooth in both sexes, shining, without fine punctation. Body oval, small (4—5 пи). Elytra distinctly raised apically, with few scattered, sometimes indistinct dots. Rows of dots distinct; outer rows often markedly,depressed anteriorly ........... а MORN) rset Beech eae а О *5. а. suffriani Scr. Body ovoid, larger (5—7 mm). Apex of elytra slightly raised; dots in this part depressed, forming an oval figure. Inner rows of dots markedly thinner than outer rows. Mesothorax and anal sternite nearly black. Apex of penis truncate, slightly shorter ааа и вое та ir au lis *6. G.natator L. Inner rows of dots much thinner than outer rows. Mesothorax and anal sternite always rust red. All dots of oval figure at apex of elytra uniformly depressed. Elytra less broadly rounded apically. Penis truncate apically, slightly longer than in G.natator. Body ovoid or slightly oval OS SAM CER MLE NRE a anes RAMEN ALS HAS eee anna Nt *7. а. substriatus Steph. Dots in outer half of oval figure more depressed; a strongly marked fold (knot) therefore present between the dots and margin of elytra. Apex of elytra more broadly rounded. Body more oval. Рея ROWING! EFo@EVINZ Tg a Glo 6 Go oo So ae 8. G.mithrae Zaitz. Intervals between rows of dots of elytra with fine punctation or delicate striation in both sexes (or only in female). Intervals in male smooth, strongly shining; less shining in the female, with delicate punctation. Outer apical angle broadly rounded, hardly visible. Rows of dots with fine dots; dots weaker DOSTSRIOM yo oe. ca Ne tor belkc:) cMeUla ale Meme vel nie Maya ее 9. а. curtus Motsch. Intervals more or less densely and distinctly covered with fine dots or dashes in both sexes. Intervals with delicate, needle-shaped, oblique dashes. Other characters asin G.distinctus. Apex of penis forming a broad angle. Inner side of parameres with an indentation.......... Bee ca MO iu (oH Peep ss AUN LAE TRV ay ial cad ec *10. G.colymbus Er. Intervals more or less densely and finely punctate. Only intervals finely punctate; fine punctation weak and scattered. АША вом of idotsydistinet:similanh |; Sonne. . *11. G.distinctus Aubé. Not only intervals, but also whole dorsum clearly and densely, finely punctate. Rows of dots delicate; inner rows thinner or absent. sides! of ely trai withiarsilksyjiridescence) iia shin. een ern а 12. G.libanus Aubé. Epipleura of pronotum and elytra dark, with metallic iridescence. Small (4—4.7 mm), markedly convex. Elytra broadly rounded apically; outer angle absent. Intervals without fine punctation. Rows of dots strongly marked; outer rows more sharply marked and closer together; they become thinner or are absent posteriorly. $2 350 41 (40). 42 (39). 5917 Воду ovoid. Dorsum smooth, shining; sides with a golden sheen. Analysternitengeds, бе. и deco Aw obese 13. G. gestroi Rég. Body oblong, less shining; sides with a coppery sheen. Anal Stermitey Чат коме 16 14. G.convexiusculus Mac Leay. Larger (5—7 mm), less convex. Rows of dots present only laterally and posteriorly, or absent and replaced by coppery red longitudinal stripes. Dorsum black, sometimes mat but sometimes with a strong metallic sheen. Intervals delicately shagreened .......... 15. G.luctuosus Rég. All rows of dots well marked. Elytra truncate apically; outer angles well marked, slightly rounded. Dorsum of both sexes smooth, shining (with a very delicate and sparse fine punctation only in var. kriiperi), dark bronze, with a greenish iridescence. Inner rows of dots markedly weaker than the outer rows ...... *16. G.dejeani Br. Elytra more or less rounded apically; outer angles of elytra less marked, sometimes absent. Intervals between rows of dots smooth, shining in both sexes... Se ae EN Ge Tome ИЕН *17a. G. japonicus francki Ochs. Intervals finely punctate or shagreened in female or in both sexes. Intervals smooth, without fine punctation in male; all intervals on disc or only outer intervals shagreened in the female. Outer angle almost not marked apically. Shagreened sculpture of elytra distinct. Rows of dots coarser, closer together. Body [SURO CUI бов И НИ 17. а. japonicus Sharp. Outer angle of elytra distinct; shagreened sculpture of elytra more delicate.. Body slightly oblong, . 3... . 18. G. orientalis Вер. Intervals between rows of dots with fine, scattered punctation in the male; this punctation denser in the female, or the shagreened sculpture forms a network in both sexes. Intervals with fine punctation and with a delicate network which is not continuous. Intervals more or less convex posteriorly. Larger (6—8 пт). Maximal width of body behind the middle. Rows of dots coarser; two inner rows strongly depressed posteriorly in form of grooves; outer angles rounded; lateral border (rim) slightly broader, especially posteriorly; last row of dots usually not reaching beyond the groove (boundary between rim and disc); it;becomes uniformly; pointed: towardtithevapex ааа. О А conde Wien eee MURR ce eM EH) A apn ARLENE OR *19,. а. marinus Gyll. Smaller (4.5—6 пи). Maximal width of body in the middle. Rows of dots thinner; two inner rows markedly deepened posteriorly; outer angles less rounded; lateral border slightly narrower, uni- formly narrow throughout; last row of dots usually slightly projecting inward from the groove; bronze sheen at the sides more marked. Anterior quarter of penis narrow, with parallel side sxrapessOtapenisiblunt w/e seek 2) Beene *20. G.aeratus Steph. Intervals partly or completely shagreened, with a network, rarely slightly raised posteriorly. 373 43 (44). Intervals shagreened in the posterior half and laterally, with а delicate network. Dots of inner rows usually considerably smaller than in the outer rows. Outer angles indistinct. Penis tapering from the second third, with blunt apex .... #21. G.pullatus Zaitz. 44 (43). Intervals on elytra completely covered in both sexes with a distinct network of irregular rounded cells, not convex. Outer angles indistinct. Rows of dots slightly thinner than in G.marinus. Репис laitoeloly смо уаре ка WON MEWOC ве арена *2, Gyrinus (5. str.) urinator 1. Illiger, 1807:299; Régimbart, 1883:143; Ganglbauer, 1892:526; Zaitsev, 1907:238; Csiki, 1946:701; Guignot, 1947:259; ab. variabilis Aubé, 1836, leon. “Col м:392: abs na xls Л. Muller= 1926, Studs емо. 2300p Broadly ovoid, markedly shining, bluish black; apex of last sternite rust colored, with copper-colored longitudinal stripes on elytra; venter rust red, its middle sometimes black (ab. naxius Miill.); elytra sometimes mat, black, rust colored at the apex (ab. variabilis Aubé). Head bronze colored, slightly mat, with a delicate network. Pronotum bluish black, with a bronze sheen laterally; sides slightly rounded. Elytra rounded apically, their outer angle almost absent; 7 or 8 outer rows of dots delicate or indistinct; bronze-colored stripes along the rows; outer rows almost groovelike, with large dots; dots in the posterior half in all rows larger than the anterior dots; rim broad and ending near the outer angle. Length Э.И Distribution. USSR: Ukraine (''Volyn Province,'' Hochhuth). The records from the Moscow and Leningrad regions are certainly erroneous; the records from Uralsk (Zhuravlev) should be confirmed. Mediterranean (especially West Mediterranean),Central Europe (to England and Poland), Hungary. *3. Gyrinus (s. str.) paykulli Ochs. Ochs, 1937, Kol. Rundschau, 13:39; Csiki, 1946:700; Guignot, 1947:258. — bicolor Paykull, 1798, 1:239; Régimbart, 1883:160; Ganglbauer, 1892:528. — celox Zaitzev, 1907:239 (not Schiddte). The most oblong of all Russian species. Body slightly oval, with almost parallel sides, slightly convex. Venter black, often with a rust tone on mesothorax and anal sternite. Epipleura and tarsi always reddish yellow. Apex of elytra rounded; outer angle absent; rows of dots with small dots; lateral rim narrow, ehding slightly behind the outer angle. Length6.5—8 mm. Closely resembling G.caspius Меп., differing from it in the much narrower body with parallel sides and without outer angle; row of dots at anterior margin of pronotum curved away from the margin at the sides; inner rows of dots as strong anteriorly as posteriorly; outer rows stronger near the base; lateral rim of elytra reaching farther posteriorly; meso- thorax and anal sternite darker, sometimes almost black; posterior margin 374 of abdominal sternites rust red. Male. Penis as long аз parameres, very broad at the base, slightly tapering to three quarters of its length, then tapering sharply and ending in a point. Parameres broad in the apical half, with truncate end. Distribution. European USSR, Transcaucasia, Siberia, steppes of Kazakhstan. Europe (rare in the south). Ecology. It occurs preferably in large water bodies and marshes with cold water, among thickets of Scirpus and Phragmites. x4, Gyrinus (5. str.) caspius Mén. Ménétriés, 1832, Cat. rais.:142; Régimbart, 1883: 158; Ganglbauer, 1892:528; Zaitsev, 1907:239; Csiki, 1946:700; Guignot, 1947:258; ab. an- gustatus Aubé, 1838, Icon. Col.:387.— elongatus Aubé, 1838, Icon. Col. :384.— celox Schiddte, 1841, Danm. Eleuth. :565. Form of body varying, oval to markedly oblong, narrow (sometimes with almost parallel sides — ab. angustatus Aubé), slightly convex to almost cylindrical. Venter black; mesonotum and anal sternite light red; epi- pleura and legs rust yellow (whole venter rarely dark). Elytra truncate apically; outer angle rounded, indistinct; rows of dots moderately strong; inner rows slightly thinner in the anterior half; border narrow, ending immediately behind outer angle. Penis as long as parameres; almost parallel-sided from the middle, broadened in form of a spatula at the truneate apex.: length: 5 = 7.5: mum) Distribution. USSR: Crimea, Caspian steppes, Transcaucasia, Middle Asia. Mediterranean to Central Europe, Asia Minor, Iran. — Ecology. It occurs in fresh and brackish water, especially on the sea shore, where it sometimes occurs in large numbers. *5. Gyrinus (5. str.) suffriani Scr. Scriba, 1855, Stett. Entom. Zeitz.:210; Régimbart, 1883:162; Ganglbauer, 1892:528; Zaitsev, 1907:240; Csiki, 1946:700; Guignot, 1947:257. Regularly oval, slightly oblong, slightly convex; venter black; epipleura and legs rust brown. Differing from G.substriatus Steph. inits narrower body, smaller size, richer and more extensive bronze coloration of the sides, and more depressed dots in the groove at the anterior margin of the pronotum; inner rows of dots stronger anteriorly than posteriorly, thinner than the outer rows, but less than ш G.substriatus; dots in the 3 next rows markedly depressed in the anterior third, forming grooves; dots of last row large near the base, becoming very fine toward the apex; a special characer of this species is that the oval figure of dots at the apex is indistinct; its dots fine, confused and shallow. Dorsal side of penis constricted in the middle, ending in a rod with almost parallel sides, which is narrower than in G.substriatus; apex blunt. Length 4—4.8 mm. Distribution. South of the European USSR, Transcaucasia. Central and Southern Europe, Asia Minor. 375 352 Ecology. It occurs in various types of water bodies; however, always singly or in small groups. Generally rare. *6. Gyrinus (s. str.) natator Г. Linné, 1738, Syst. nat., ed. X:412; Régimbart, 1883:156; Ganglbauer, 1892:527; Zaitsev, 1907-240; Csiki, 1946:699; ab. oblitus Sharp, 1914:133; wankowiczi Régimbart,1l.c.:157; Csiki, 1946:699; subsp. szechuanen- Sic Oclas, 1929), I2eOeC, Uo So Nees) Mines. (55 Bie. Sk. Ovoid; bluish black, slightly shining, with a bronze sheen laterally and along the suture; venter black; legs and epipleura rust yellow (rarely also mesothorax and anal sternite — ab. oblitus Sharp). Elytra with broadly rounded outer angles, strongly shining; all rows of dots with strong dots, except sometimes the inner rows which may be slightly thinner; intervals without punctation. Penis asin G.substriatus, but slightly shorter. Length 5—7 mm. Distribution. Northern and central European USSR, Siberia. Northern Europe and part of Central Europe. Ecology. Common inthe most diverse types of water bodies. 6a. Gyrinus (s. str.) natator szechuanensis Ochs. Form of body and coloration of venter as in G.substriatus; meso- thorax broadly oval, dark rust colored; anal segment and epipleura light red. Rows of dots of elytra as in G.natator, distinct near the suture; pronotum relatively long, with weak outer impressions (after Ochs). Distribution. China: Szechwan (described from 2 females found at about 4,000m). This is probably a valid species. *7. Gyrinus (s. str.) substriatus Steph. Stephens, 1827, 1, Brit. Ent., П:97; Ganglbauer, 1892:528; Zaitsev, 1907:240; Csiki, 1946:699; Guignot, 1947:257; ab. fowleri O.-Coop., 1930, Entom. Month. Mag., 66:74; ab. schatzmayeri Ochs, 1927, Kol. Rundschau, XIII, No. 1:34; corpulentus Schatzmayer, 1903, Wien. Ent. Zeitg., XXII:172 (not Régimbart). Closely related to G.natator with which it has been confused. Differing from it as follows: body more regularly oval; sheen stronger; coloration lighter; it differs from it especially in that the inner rows of dots on the elytra are markedly thinner than the outer rows (inner rows sometimes hardly marked); mesothorax and anal sternite always rust red (rarely of the same color as the other part of the venter — ab. fowleri Coop.). Intervals between rows of dots without punctation; traces of punctation rarely present (ab. schatzmayeri Ochs.). Penis as in G.natator, but always longer, as long as the parameres, moderately 376 broad, slightly tapering beyond the middle; further on, its sides are almost parallel, its apex truncate. Parameres obliquely truncate apically. Length 5—-7mm. Larva. Body spindle-shaped, thickest in the region of abdominal segments 2—5. Clypeus truncate; anterior angles rectangular. Pronotum trapezoidal, with two sclerotized plates. Tracheal gills long; last two pairs almost 3 times as long as the 9th abdominal segment. 353 Distribution. Central and southern parts of the European USSR, southern Siberia, Transcaucasia, Kazakhstan (rare). Central and Southern Europe, Mediterranean. 8. Gyrinus (s. str.) mithrae Zaitz. Zaitsev, 1908, Russkoe Entomologicheskoe obozrenie, VIII:240. Oval, nearly ovoid, narrow, slightly convex, bluish black, shining; venter black; epipleura and legs reddish yellow; mesothorax and anal sternite rust red. Elytra broadly rounded apically, their outer angle slightly marked; rows of dots as in G.substriatus; intervals without punctation; rim moderately narrow, ending immediately behind outer angle; apical oval figure of dots more depressed in the outer half; there is therefore a thick fold between this figure and the lateral margin, which almost forms a knot. Penis resembling that of G.natator, but with roundly pointed, not truncate apex. Elytra sometimes mat, delicately shagreened. Length 7 ава Distribution. Iran (Gilan); it possibly occurs in the Talysh mountains. 9. Gyrinus (s. str.) curtus Motsch. Mochul'skii, 1866, Bull. Soc. Nat. Moscou, XXXIX:165; Sharp, 1884, Trans. Entom. Soc. London:448; Régimbart, 1886:254; Zaitsev, 1907:240. Ovoid, broad, convex, markedly shining; venter black; epipleura, legs and anal segment reddish yellow. Intervals on elytra of female smooth, with a very delicate, hardly marked network, and shining as in the male; elytra broadly rounded apically; outer angle indistinct; rows of dots with moderately large dots; dots slightly larger in the outer rows; dots smaller and less depressed in the posterior half; rim narrow. This species differs from G.japonicus inits smaller size, the red coloration of epipleura and last sternite, etc. Length 4.7—5 шт. Distribution. Japan. *10. Gyrinus (s. str.) colymbus Er. Erichson, 1837, Kaf. Mk. Brndbg., 1191; ?Sharp, 1914:135; Ochs, 1942, Ann. Mus. nat. Hung., XXXV:70; Guignot, 1947:256.— strigulosus Régimbart, 1891:677; Csiki, 1946:698; Sharp, 1914:135. — striolatus Sharp, 1914:135; Zimmermann, 1917:157 (not Fowler). 377 354 Closely resembling G.distinctus, with which it has been confused (Seidlitz, Ganglbauer); it differs from it in the narrower rim of the elytra (which is hardly marked in the anterior half), the more posteriorly projecting scutellum which forms an isosceles triangle, and especially, the characteristic sculpture of the elytra which consists of dense needle- shaped dashes which are directed obliquely posteriorly and laterally. Male genitalia markedly different: penis slightly shorter than parameres, gradually tapering, abruptly broadened into a triangle at the end; para- meres gradually broadening to the obliquely truncate apex. Length 5—7 mm. Distribution. USSR: Belorussia (Minsk), Taman (probably more widely distributed in the European USSR). Greater part of Europe. Rare. Ecology. It occurs in fresh and brackish water. *11. Gyrinus (s. str.) distinctus Aubé. Aubé, 1836, icon. Cols, №:383; Guienot, 194722516, = а5. hung ayenre rugs Seidlitz, 1887, Reitter, Bestimm.-Tab.:115; Sharp, 1914:134; ab. fair - mairei Régimbart, 1883:144.— fulviventris Reitter, 1908, 1:235 (sec. spec. orig.). — colymbus Ganglbauer, 1892:528 (part); Zaitsev, 1907:241.— caspius Régimbart, 1883:158 (not Ménétriés). Regularly oval, convex, shining, blackish, with a slight bronze sheen laterally; venter black; mesothorax, epipleura and often anal sternite reddish rust colored; legs of the same coloration (ends of epipleura some- times dark — ab. hungaricus Seidl.). Scutellum short, triangular, with a bronze sheen. Elytra slightly rounded apically; their outer angles weakly marked; rim narrow but uniformly broad. Outer rows of dots slightly coarser than inner rows, especially near the base; last outer row situated outside the groove, thinner toward the apex. Penis very charac- teristic; shorter and broader than parameres, narrower in the middle, then broadening gradually again toward the rounded apex. Parameres with markedly concave inner margin. Length 5.5—7 пт. Distribution. South of the European USSR, Transcaucasia, Middle Asia. Central and Southern Europe, Mediterranean, Asia Minor, Meso- potamia, Syria, Iran, China (Tibet), Mongolia. 12. Gyrinus (s. str.) libanus Aubé. Aube, 1838, Spec. col., У1:667; Régimbart, 1891:677; Zaitsev, 1907:240. Oval, broad, slightly convex, black, with a silky bronze sheen; greenish laterally; venter black; epipleura and legs yellow; anal sternite light brown. Dorsum with dense, distinct punctation. Elytra broadly rounded; their outer angle distinct, rounded, more distinct than in G.distinctus; rim narrow; inner rows of dots more or less indistinct; outer rows deeply impressed; intervals slightly raised. Length 5.5—6.5mm. This species is easily distinguished from the other European species by its silky, slightly shining surface. Distribution. Greece, Syria, Cyprus. 378 55 13. Gyrinus (3. str.) gestroi Rég. Régimbart, 1883:165; idem, 1907:170; Zaitsev, 1907:241. Ovoid; slightly oblong, markedly convex; dorsum with a strong sheen; black, with broad golden iridescence laterally; venter black; legs, anal sternite and apex of preceding sternite rust colored; whole venter some- times rust red. Elytra rounded apically; outer angle absent; rows of dots deeply impressed; outer rows with larger and denser dots; dots finer and almost absent posteriorly. Length 4—4.5mm. Distribution. Japan, Korea. 14. Gyrinus (s. str.) convexiusculus Mac Leay. Mac Leay, 1871, Trans. Entom. Soc. N.S. Wales, П:128; Régimbart, 1883:166; Zaitsev, 1907:242. Ovoid, oblong, markedly convex; black, with a bronze or golden sheen laterally; venter black; anal sternite partly red. Elytra without fine punctation; outer angle almost absent. Inner rows of dots with large dots; outer rows with moderately large dots which are often fused; dots more or less indistinct posteriorly; intervals convex. Length 4—4.5mm. Distribution. Indo-Malayan Region, ?Tibet, ?China. 15. Gyrinus (s. str.) luctuosus Rég. Régimbart, 1883:168; Zaitsev, 1907:242. Ovoid, oblong, tapering posteriorly, slightly convex, weakly compressed, often with a dull sheen, with copper or purple iridescence on head and sides of pronotum. Venter black; anal sternite, outer margin of first two sternites, inner half of epipleura and legs red. Elytra truncate apically; outer angle blunt, rounded; rows of dots of disc situated on bronze on purple lines; surface with very delicate, dense punctation; surface therefore appearing silky, slightly mat; dots of rows slightly impressed, often delicate, almost absent; rim narrow, broadened subapically. Length 6—6.5 mm. Distribution. Iraq, Arabia. *16. Gyrinus (s. str.) dejeani Br. Brullé, 1832, Expéd. Mor., П1:128; Ganglbauer, 1892:527; Zaitsev, 1907:242; Guignot, 1947:256; ab. krtperi Seidlitz, 1887, in:Reitter's Best.-Tab., XV:116. Resembling G.marinus and G.aeratus inform of the body and in the black epipleura; it differs from them in the absence of punctation in the intervals on the elytra, the truncate end of the elytra, the rounded but distinct outer angles; outer rows of dots deeply impressed, with large dots; inner rows less marked; intervals of elytra smooth (sometimes shagreened — 379 356 ab. kriperi Seidl.). Scutellum more oblong and pointed; claws not black. Penis shorter than parameres, broad, gradually tapering, with truncate end. Length 4.8—6 mm. Distribution. USSR: Kiev Region, Crimea and Talysh. I have seen only 2 specimens labeled ''Caucasus Leder''; they are probably from the Black Sea coast of the Caucasus. Mediterranean to Asia Minor. *17. Gyrinus (s. str.) japonicus Sharp. Sharp, 1873, Trans. Entom. Soc. London:55; Régimbart, 1883:255; дащдех, 19.07.2482: выбзр. imam eke Ochs 1929 ЕТ. Виа ева 325 Ochs, Proceed. Nat. Mus. Wash., 75, 3:2. Closely resembling G.substriatus, but shorter, markedly more convex; epipleura often with a reddishtone. Dorsum black, strongly shining, with a bronze sheen laterally. Elytra broadly truncate apically, with markedly rounded outer angles; dots in the rows strongly impressed, coarser laterally, finer or sometimes absent in the posterior half; intervals smooth, without punctation in male, less shining in females of the typical form, with a delicate but distinct network on a large part of the disc, smooth laterally, along the suture and apically. Penis broad, with broadly rounded apex. алии! 555) Y wae, Distribution. The typical form occurs in Japan and in the Ryu Kyu Islands; the subspecies francki occurs in the Maritime Territory and Korea. 17a. Gyrinus (s. str.) japonicus francki Ochs. Female with intervals shining and without a network as in the male. Maritime Territory, Korea. 18. Gyrinus (s. str.) orientalis Rég. Régimbart, 1883:167; Zaitsev, 1907:242; female ab. politus Ochs, ПО) IPOs МЕ, Мо о Ив, Sy ВЗР Ovoid, slightly oblong, moderately convex, shining, black, with а coppery sheen laterally; venter black; epipleura slightly rust colored. Elytra of male smooth; female with a delicate network on the disc which does not extend to the base, sides and apex (elytra rarely as smooth as in the male — ab. politus Ochs); apex of elytra truncate; outer angle obtuse, slightly rounded; rows of dots deeply impressed, close together, dots coarser laterally. Closely related to G.curtus, but differing in its less convex body, the truncate apex of the elytra, the much more approximated rows of dots, the rust-colored epipleura, and the network in the outer half of the elytra in the female. Length 6mm. Distribution. North and East China. 380 *19. Gyrinus (3. str.) marinus СУП. Gyllenhal, 1808, Ins. suec., [:143; Ganglbauer, 1892:526 (part); Zaitsev, 1907:243; Csiki, 1946:697; Guignot,1947:255; ab. dorsalis Gyllenhal, 1808, ibid. Oval, broader posteriorly, markedly convex, bluish black, with a bronze sheen laterally. Pronotum with almost straight lateral margin and with scattered dots. Elytra broadest behind the middle; apex of elytra rounded; outer angle indistinct; (357) IN| OF lateral rim thin, ending posteriorly at the beginning 357 Wr of the rounded part of the elytra; groove along the lateral rim broad, flattened, broader posteriorly. Rows of dots with large dots; inner rows slightly thinner and less distinct anteriorly; first two inner rows slightly grooved posteriorly and intervals between them therefore slightly convex; last row situated in the groove. All intervals shagreened or covered with dense dots. Anal sternite sometimes partly red. Claws black at the base. Male with shining elytra; shagreened sculpture of dorsum weakly marked on a greater or smaller area; female less shining, with a lead-colored iridescence; shagreened sculpture (especially of the elytra) distinct, denser, with a very delicate network in the re intervals; network consisting of slightly transverse cells. There are rarely specimens with com- pletely mat dorsum and a more or less-extensive brown coloration on the disc, as in several other species (ab. dorsalis Gyll.). Length 6—8 mm. Penis slightly shorter than parameres, tapering into a spine at the end. Parameres slightly sloping at the end. < The larva (Figure 73) differs from that of G.substriatus in the equally long branchial tracheae on all segments. Pupa not described. = Distribution. Northern and-central parts of the European USSR, West Siberia. Northern Europe and part of Central Europe. Ecology. Usually in stagnant, cool water, also in backwaters of rivers. FIGURE 73. Gyrinus *20. Gyrinus (s. str.) aeratus Steph. marinus Gyll. Larva. Stephens, 1835, ПТ. Brit. Entom,, V:395; Brinck, 1939, Op. Ent. Lund. :22;.aeneus Thomson, 1860, Skand. Col.,1I:116.— орасиз Ganglbauer, 1892:527; Zaitsev, 1907:243.— thomsoni Zaitsev, 1907:243; Zimmermann, 1917:151.— edwardsi Sharp, 1914, Ent. Month. Mag., XXV:137. Closely related to G.marinus, with which it has been confused. It differs from it in its smaller size, the more oval body which is broadest 381 358 in the middle; the bronze sheen оп the sides of the elytra extends over а larger area, reaching beyond the groove; apex of elytra less broadly rounded; outer angles recognizable; lateral groove narrower, not broadened posteriorly; rows of dots slightly weaker; both inner rows only slightly impressed posteriorly; last row directed inward from the base; the whole row situated outside the lateral groove. Dots in rows usually with a bronze sheen at the bottom. Sculpture more distinct than in G.marinus in both sexes; females of two forms: one with the same sculpture as the male, and the other with a more distinct sculpture. Penis as long as parameres, tapering only in its last quarter; its sides more or less parallel. Para- meres with truncate end. Dorsum sometimes as in G.marinus, witha dull sheen. Length 4.5—6 mm. Distribution. Northern and central European USSR, Siberia. Northern and partly Central Europe; Mongolia. *21. Gyrinus (s. str.) pullatus Zaitz. Zaitsev, 1907, Russkoe Entomologicheskoe obozrenie, VII:244; Ochs, 1928, Entomol. Zeitschr. Frankfurt, XLI:46. Ovoid, slightly oblong, slightly convex, shining (male) or with a dull sheen laterally (female); bluish black, with a copper or bronze sheen laterally; venter black; antennae and legs rust red; claws black. Head and pronotum with weak, irregular wrinkles and scattered dots, without network. Elytra obliquely rounded apically; outer angle almost absent, broadly rounded; rows of dots with large dots which are sometimes weaker inwards and posteriorly; intervals flat, both-inner intervals rarely slightly convex in the posterior half; elytra of male with few dots and scattered fine punctation; female also with delicate shagreened sculpture (much more delicate than in G.opacus and consisting of rounded and smaller cells) more distinct laterally and posteriorly. Epipleura of elytra sometimes with slightly reddish coloration in the basal half. Penis tapering from the 2nd third, blunt at the end. Length 5—6 мм. Distribution. East Siberia; Maritime Territory. *22. Gyrinus (s. str.) opacus Sahlb. C.R. Sahlberg, 1819, Ins. Fenn., 1:47; Régimbart, 1891:679; Sharp, 1914:135; Zimmermann, 1917:152. Closely resembling G.aeratus, with which it has been confused; it differs from it in a number of characters. Body slightly more convex, with a weaker, slightly silky sheen, less tapering anteriorly and posteriorly; elytra less rounded apically; their outer angle therefore more distinct; rows of dots thin, only slightly stronger in the posterior half than in the anterior half, uniformly black. The important differences are in the sculpture of the surface and in the male genitalia. The sculpture is the same in both sexes and consists not of small dots as in G.aeratus, but of rounded, closed loops of the network on the elytra; on head and pronotum it consists of thin irregular wrinkles and dense punctation at the base of the pronotum which is stronger than in the middle. Penis broad, slightly narrower anteriorly, its truncate apex 3 times as broad as in G.aeratus. Length 5.25—6.25 mm. 382 Distribution. Anarctic species recorded from northern Finland (Lapland) and the Kola Peninsula. It probably occurs also in the Siberian tundra. Ecology. It occurs in small stagnant water bodies with stone-sand bottom in the tundra. 2. Subfamily ENHYDRINAE Régimbart, 1882:391. Scutellum not visible; fore tarsi slightly more broadened in male than in female; inner and outer margin of fore tarsi not parallel. This subfamily contains two tribes, one of which, Dineutini, contains over 70 species, and extends into the Palearctic region. 1. Tribe DINEUTINI Ochs, 1926, Entom. Zeitschr. Frankfurt, XL:61— 63. Only one genus, Dineutes, with 17 subgenera, only one of which, Spinosodineutes Hatch (Gyrinodineutes Ochs), is represented in the Palearctic Region. (359) (82 } 3. Genus Dineutes Mac Leay. Mac Leay, 1825, Ann. javan.:30; Régimbart, 1882:394; Ochs, 1926, Entom. Zeitschr. Frankfurt, XL:136. Type species: Dineutes politus Mac Leay. More or less oval, slightly convex (rarely rhomboidal and markedly convex), sometimes cylindrial; maximal convexity in region of scutellum. Labrum transverse, rarely slightly oblong. Epkpleura of elytra ending near 2nd third of elytra, where there is therefore, a more or less distinct depression on the lateral margin. Elytra sometimes with one or several more or less developed denticles near the outer angle; sculpture consisting of a delicate network with scattered dots and dense, \ fine punctation. Rows of dots absent. Fore- (а) \ legs very long, especially in the large species; АХ they are slightly broader in the male and have Vy) № small adhesive discs оп the ventral side. df ma Larvae (Figure 74) described for several г.) \ American species; they resemble the larvae of | Gyrinus or differ from them in that both pairs of terminal appendages are without feathered branchial filaments. FIGURE 74. Dineutes ameri- Ecology. It occurs only in rapidly running canus. Larva. water, especially in mountain brooks. 383 360 Key to Species 1 (2). Lateral margin of pronotum and elytra with a narrow yellow lateral border ens Baht a ae Ee Gt *1. О. orientalis (Modeer). 2 (1). Dorsum of uniform color, without yellow borders see en Sat TERY QUA ALINE ME AURORE A WASTE Tine. PE. congsin ee 2. D.unidentatus Aubé. *1, Dineutes orientalis (Modeer). Modeer, 1776, Physiogr. Sallsk. Handl., I, 3:167; Ochs, 1927, Entom:. Zeitschr. XL:190.— marginatus Sharp, 1873, Trans. Ent. Soc. Lond. :196; Régimbart, 1882:413. Ovoid, slightly oblong, convex, slightly compressed posteriorly; dorsum greenish,with a coppery sheen; suture and disc of elytra with 2—3 purple, longitudinal stripes; lateral margin with a narrow, rarely broad yellow border; venter uniformly, rust red. Elytra with a delicate network; posterior half with weak dots and 4—5 longitudinal dashes; one spinule at the lateral margin; apex obliquely rounded; sutural angle absent; elytra gaping at this point, with a spine at the end of the suture. Male witha pointed outer apical angle on the fore tibiae; female more oblong, less compressed posteriorly; elytra with a small depression at the lateral margin behind the lateral spine. Length 8.6—9 mm. Distribution. USSR: Maritime Territory. Southeast Asia, China, Japan. 2. Dineutes unidentatus Aubé. Aubé, 1838, Spec. Col., VI:788; Régimbart, 1882:412; Nowroje, 1912, Мет. Юер. Agric... India, nt. эег., И,_М№о. 92 77. Ovoid, oblong, slightly convex, black, with a greenish or coppery iridescence; venter uniformly light rust red. Elytra with delicate network and indistinct scattered fine punctation, with traces of several longitudinal dashes; lateral margin with a spine and with an indentation behind it; apex of elytra with fine denticles but without spine at the rounded inner (sutural) angle. Length 7.5—8 mm. Distribution. China, northern India, Java. 3. Subfamily ORECTOCHILINAE Régimbart, 1882:391; Ganglbauer, 1892:529; Ochs, 1926:63; Guignot, 1947:260. Last abdominal sternite conically produced; its posterior half with a longitudinal row of cilia in the middle. Only one of the 3 genera of this subfamily is represented in the Palearctic Region. 384 ‘61 4. Genus Orectochilus Lac. Lacordaire, 1853, Fn. entom. Paris, 1:344; Régimbart, 1883:385; Ganglbauer, 1892:529; Guignot,.1947:260.— subg. Patrus Aubé, 1836—38, Ione Со: 39. Type species: Gyrinus villosus Mull. Body convex, completely or partly pubescent. Scutellum small, often only partly visible, covered by middle of posterior margin of pronotum. Epipleura broad, almost uniformly broad, tapering before the outer angle, where they end. Mid tarsi divided in the mid line and strongly produced lateraliy into a long oblique triangle with narrow, rounded apex. Fifth segment of fore tarsi of male less than 1.5 times as long as penultimate segment. The species live in running water of mountain brooks and are nocturnal. The genus contains ‘over 160 species, mainly in the Indo-Malayan Region; 2 species occur in Africa and several species in the Palearctic Region; only one species occurs in Europe. The genus is divided into 2 subgenera. Only the larva and pupa of O.villosus have been described. Larva. Clypeus truncate anteriorly, without denticles; labrum jagged near the apex and with 2 strong setae of different length; inner lobe of labium with one thick, strong seta. Empodium with 4 spurs forming a group. Branchial tracheae short; last two pairs twice as long as segment 9. Length 12—14 mm. Pupa. Body slender, thicker anteriorly, uniformly tapering posteriorly, pubescent dorsally and laterally; venter bare. Thoracic segments of equal length; sclerotized plates indistinct. Abdomen 8-segmented; spiracular tubercles only on the first 4 segments. Cerci small, conical, membranous. Key to Species 1 (14). Dorsum completely covered with short, more or less dense pubescence.( (Subgenus Orectochilus s.str.) 2 (9). Rim of elytra of the same color as the disc, sometimes more or less distinctly yellow. 3 (8). Oblong, narrow. Dorsum with whitish or yellowish gray pubescence. Outer angle of elytra markedly rounded, indistinct. 4 (7). Elytra covered with fine or very fine dots. Dorsum shining. 5 (6). Smaller (5.5—-7mm). Head delicately shagreened; anterior half of head and region near eyes with dense dots; posterior half of head with weak scattered dots which are often absent. Body more or less broad at the shoulders. Labrum narrower. Penis thin; paramenresi marrow, with parallel 5зае rags ионы: ев а ная aera) ers *1. O.(s. str.) villosus (Mull.). 6 (5). Larger (7.5-9mm). Head markedly shagreened; anterior half of head with coarse, dense dots, posterior half with less coarse but dense dots. Elytra with parallel sides. Labrum more transverse. Penis broader, its apex more pointed; parameres broad in the apical fourybitthy о Ве, leis) eye one *2. О. (s. str.) involvens Fald. 385 362 7 (4). Elytra with coarse, sometimes rugose dots. Dorsum shining, ВОЕН < met (EP) 6 oo fe oo *3. O. (s. str.) punctipennis Sharp. 8 (3). Short and broad. Dorsum with lead-gray pubescence, less shining, with coarse dots. Outer angle less rounded, distinct. Penis thick; with broadly "roundediapesc Wis hy amen a ie keane at ee ee ean и, с *4. О. (3. str.) zeravshanicus Glaz. 9 (2). Rim and groove of elytra always yellow. ) 10 (11). Head completely mat due to the dense and coarse shagreened Эссе. . lAvIACtTEIIOIO Cli Elynnice, COME, соабне 6 ocd 4 5 6 bd 5b = o SNL. MDA cad flan a Maule Се ies 5. O. (s. str.) obscuriceps Reg. 11 (10). Head shining. 12 (13). Larger (8.5-9mm). More convex; elytra slightly truncate CSI OPI area ete i eM RR My RS 6. O. (s. str.) regimbarti Sharp. 13 (12). Smaller (6—6.25mm), Less convex; elytra truncate apically sek NV tec oie se lig catego seals stated Ме Сы зи 7. O.agilis Sharp. 14 (1). Pubescence present only at sides of pronotum and elytra. It extends beyond the apex of the elytra and then along the suture to about Mg of its length. Rim of pronotum and elytra reddish slow A ( 2) uA SUD Se MUS Рабкы я Аи 1. Subgenus Orectochilus s.str. Туре species: Gy rainws) va Wios us М. Dorsum completely covered with short, more or less dense pubescence. *1. Orectochilus (s. str.) villosus (Mull.). О. Muller, 1776, Zool. Dan. Prodrom. :68 (Gyrinu 5) Ganglbauer, 1892:530; Csiki, 1946:720; Guignot, 1947:260; subsp. dauricus Mochul'skii, 1860, Schrenck's Reisen, П:102. — sibiricus Mochul'skii, 1860, ibid. :103; subsp. bellieri Réiche, 1861, Ann. Soc. entom. Е. (4) [:203; Guignot, 1947:260; subsp. syriacus Régimbart, 1883:433.— reitteri Seidlitz, 1887, Verh. naturf. Ver. Brunn:117.— seidlitzi Yakobson, 1907, Zhuki Rossii i Zapadnoi Evropy, V:439; subsp. latior, nova. Oblong, oval, strongly convex, slightly compressed laterally, shining; dorsum black, often with a bronze sheen; completely covered with yellowish or grayish, silky, not very dense pubescence on the disc. Venter reddish yellow to dark brown. Anterior part of head and region near eyes almost mat, with coarse dense dots, shining posteriorly, with more delicate shagreened sculpture and with isolated fine dots; vertex completely smooth. Last segment of palps distinctly ax-shaped. Labrum short, curved, covered with dots and pubescence. Pronotum with straight, slightly con- verging sides, with a thin rim; anterior angles rectangular, almost not projecting; posterior angles also rectangular but narrowly rounded apically; surface with fine scattered dots; shagreened sculpture indistinct. Scutellum 386 363 broadly triangular. Elytramoreorless broad at the shoulders, obliquely trun- cate apically; inner angle rectangular,blunt at the end; outer angle rounded, absent; lateral groove narrow; rim with indistinct border, often more or less yellow; surface with fine, not very dense dots which are coarser and denser; posteriorly whole background delicately shagreened. Male. Inner lobes of hind coxae with a terminal pit; all segments of fore tarsi broadened into an oblong plate, with setigerous suckers on the ventral side. Penis shorter than parameres, gradually tapering; parameres long, narrow, rounded apically and with long cilia extending to the outer side. Female. Apex of elytra slightly more oblique; elytra with more distinct shagreened sculpture. Length 5.5—7.5 mm. Distribution. Palearctic Region (except China and Japan). The species varies markedly inform, size, and sculpture of the surface; there is a strong tendency to form local (geographical) forms, a fact which is reflected in the numerous names and great confusion in the literature. Ecology. Like all Orectochilini, this species occurs only in running water. During the day the beetles remain in the water among plants or under stones, since they cannot stand sunlight, which has a deleterious effect on them. They appear оп the water surface only with onset of darkness; they move very rapidly (more rapidly than other Gyrinidae). They like to swim against the current in order to search for food and to mate. The life of the adults is apparently very short as compared with species of Gyrinus. The pupa apparently hibernates, and possibly also the larvae of the last stage. | I have already attempted once (Raboty Severo-Kavkazskoi gidrobiolo- gicheskoi stantsii, 1928:11, ''Transactions of the North Caucasian Hydro- biological Station, 1928:11) to clarify the synonymy of the species. After revision of old material and examination of new material (but this material is also insufficient), I have come to the following conclusions: 1) O.involvens Fald. should not be considered as a subspecies of O.villosus but as a valid species which differs from O.villosus ina number of characters, mainly in the form of the male genitalia. 2) Ina small series from Transcaucasia (Borzhomi, Armenia — Zanga River) and from northeastern Turkey, the specimens are slightly larger than usual but are identical with the European O.villosus inthe punctation of the surface and in the genitalia; the typical form of O.villosus thus apparently occurs in Transcaucasia. 3) All 7 specimens from the vicinity of Tashkent (Zengi Ata, 28 May 1919, E.Kviton) are slightly broader at the shoulders and markedly more convex, with a strong bronze sheen on the dorsum. We have no other material from Middle Asia, but I assume that the typical form is replaced in this region by a local form, which Iname subsp. latior. O.villosus is probably represented in the highlands of Middle Asia by this form. 4) The form dauricus Motsch. should be considered as an East Siberian subspecies. This is confirmed by the original description and by examination of the original specimens of Mochul'skii; my specimens from Transbaikalia (Busse Village, 11 June 16, Е. Gol'mshtok; vicinity of Khabarovsk, Bykov) resemble the original specimens. 387 la. Orectochilus (5. str.) villosus bellieri Reiche. Short, compact; venter brownish. Distribution. West Mediterranean. 1b. Orectochilus (s. str.) villosus syriacus Rég. Body oblong; venter brownish black. Dis tic ution, Булла. 1c. Orectochilus (s. str.) villosus dauricus Motsch. Body with parallel sides; elytra slightly larger, more densely punctate; bronze sheen more distinct. Distribution. Transbaikalia. 14. Orectochilus (s. str.) villosus latior Zaitzev, subsp. nov. More convex, broader at the shoulders; bronze sheen more distinct. Distribution. Middle Asia. *2. Orectochilus (5. str.) involvens Fald. Faldermann, 1836, Fn. Transcauc., 1:115; Seidlitz, 1887, Verh. naturf. Ver. Brunn, XXV:17; Zaitsev, 1928,11:46; Ochs, 1929, Entom. Nachrbl., 11:45. Closely related to O.villosus, but differing from it in its larger size; sides not broader at the shoulders but parallel; head coarsely and densely punctate also in the posterior half and distinctly shagreened; labrum broad. Penis of male broader than in O.villosus, slightly shorter, very narrow and pointed at the end; parameres broad, tapering for 4s of their length. ILIA ay Иов iaaoa', Distribution. USSR: Armenia (Zanga River, Echmiadzin). North- eastern Turkey (Benarve, Shamsdinan). Probably occurring together with O.villosus,as a large series of typical O.involvens from Shamsdinan includes two specimens of O.villosus. *3. Orectochilus (5. str.) punctipennis Sharp. Sharp, 1884, Trans. Entom. Soc. London:449; Régimbart, 1886:264; Régimbart, 1891:708; Ochs, 1928, Entom. Zeitschr. Frankfurt, XLI:46. Oval, narrow, convex; dorsum black, with a weak bronze sheen, shining, with unusually coarse dots (for the genus); venter brown; abdomen lighter. Labrum projecting anteriorly. Elytra truncate apically; outer angle rounded 388 364 Fore tarsi of male less broad than invillosus. The female shows traces of longitudinal grooves on the elytra. Both specimens are immature (after Sharp). Length 5.5mm. Distribution. Maritime Territory (Ochs). Japan. Ochs identified an immature specimen from the Ussuri River as O.punctipennis; however, his description contains some data which contradict the original description. He states that the elytra are rugose and mat, the punctation denser, pubescence less regular and lighter. This identification seems therefore doubtful. *4, Orectochilus (s. str.) zeravshanicus Glaz. Glazunov, 1893, Trudy Russkogo Entomologicheskogo obshchestva, XXVII:442; Régimbart, 1907:216; Zaitsev, 1928, Raboty Severo-kavkazskoi gidrobiologicheskoi stantsii, V, 2:47; Ochs, 1929, Entom. Nachrbl., ПТ, 2:47.— involvens Reitter, 1897, Wien. Ent. Zeitg., XVI:79 (not Fald.). Oval, broad, slightly convex at the shoulders, slightly shining, lead-grayish brown, with a greenish iridescence in the grayish pubescence on the dorsal side; venter rust red; epipleura and legs lighter. Elytra finely and densely punctate; they are slightly obliquely truncate at the posterior end in the male, but truncate in the female; outer angle absent; sutural angle rectan- gular. Penis thicker, with broadly rounded apex. Length 7.5—9.25 mm. Differing from O.villosus in the broader body, the less convex dorsum, the much weaker sheen, the denser, light gray pubescence, etc. Distribution. Mountains of Tadzhikistan and Kirghizia. 5. Orectochilus (s. str.) obscuriceps Rég. Régimbart, 1907, Ann. Soc. Ent. Fr., LXXVI:215. Oblong-oval; slightly broader at the shoulders; strongly convex, laterally compressed, slightly shining, withdense, coarse dots; black; venter pitch brown or rust colored; abdomen and epipleura rust colored; head mat, due to the dense, coarse punctation; labrum with strong dots and gray hairs; anterior partofhead with long rust-colored cilia. Elytra of male obliquely truncate; outer angle rounded; sutural angle rectangular; elytra of female markedly narrower posteriorly, obliquely truncate; outer angle blunt and slightly rounded; sutural angle pointed, slightly rounded. Length 6.25—7 mm. Distribution. China (Szechwan). 6. Orectochilus (s. str.) regimbarti Sharp. Sharp, 1884, Trans. Entom. Soc. London:448; Regimbart, 1886:264. Oblong-oval;convex; laterally compressed; suture keeled in female, black, slightly shining; dorsum completely shagreened, with grayish 389 365 pubescence; venter blackish brown; abdomen and legs reddish. Labrum moderately oblong, broadly rounded, with large dots. Pronotum with delicate, weak, fine punctation; elytra with stronger dots; apex of elytra obliquely truncate; outer angle obtuse; inner angle of male rectangular, pointed and produced in the female. Presutural dash distinct in the posterior half. Length 8.5—9 mm. Distribution. Japan. 7. Orectochilus (s. str.) agilis Sharp. Sharp, 1884, Trans. Ent. Soc. London:449; Régimbart, 1886:263. Regularly oval, slightly convex, black; rim of elytra yellow; dorsum with gray pubescence, with dense, distinct dots (except on the head), delicately shagreened; venter brownish black; apex of abdomen and legs rust red. Elytra slightly obliquely truncate; outer angle obtuse and distinct; inner angle rectangular. Length 6—6.2 mm. . Distribution. Japan. 2. Subgenus Patrus Aubé. Type species: Patrus javanus Aubé. Pubescence present only on ее of pronotum and elytra. It extends to apex of elytra and to the suture to a of its length. Rim of pronotum and elytra reddish yellow. 8. Orectochilus (Patrus) chinensis Rég. Régimbart, 1891, Ann. Soc. Entom. Fr., LX:699; Régimbart, 1907:206. Regularly oval, slightly narrower posteriorly, slightly convex; dorsum delicately shagreened, with strong, dense, fine punctation; shining, black, with a narrow, dark brown lateral border; venter dark rust red; abdomen and legs rust red. Labrum markedly transverse, slightly rounded anteriorly; pubescence present only laterally and at the apex, narrow on the pronotum, Е gradually, reaching the suture before the apex of the elytra, at ob of its length; elytra slightly obliquely truncate with a distinct indentation; outer angle almost rectangular, distinct; sutural angle rectangular. Fore tibiae of male short, thick. Length 6.75—7mm. Distribution. China (Szechwan). 390. ALPHABETIC INDEX OF LATIN NAMES* abbreviatus, Eriglenus 267 abbreviatus, Haliplus variegatus 72 abdominalis, Gaurodytes bipustulatus 233 abnormicollis, Deronectes 88, 189, 191 abnormicollis, Gaurodytes basalis 224 Acanthodes 223 Acilius 81, 82, 85, 87, 92, 313, 317, 318, 319 acuminatus, Hydrovatus 111 acutangulus, Hydroporus 86, 152, 168 adachii, Hydrovatus 111 adamsi, Graphoderes 314, 315 Adephaga 17, 20, 81, 341, 342 adpressus, Gaurodytes 86, 216, 230 aenescens, Gaurodytes 236 aenescens, Hydroporus 168 aenescens, Ilibius 87, 276, 281 aeneus, Gyrinus 357 aeneus, Ilibius fenestratus 277 aequabilis, Gaurodytes 88, 222, 254, 255 aequalis, Gaurodytes 86, 88, 222, 255 aequalis, Hygrotus 126, 127 aequimarginatus, Rhantus 285, 288 aeratus, Gyrinus 342, 350, 355, 357, 358 affinis, Gaurodytes 87, 218, 239 afflatus, Hydroporus elongatulus 161 africanus, Cybister tripunctatus 334, 335 Agabidius 275, 282, 283 Agabinectes 221 Agabini 84, 91, 177, 207, 241 Agabus 86, 212, 269 Agabus 225, 226, 229, 230—232, 234— 236, 245, 248, 251, 252, 254, 255, 257, 258, 260, 262, 264—266, 270, 273 egaporus, Laccornis 177 agilis, Orectochilus 361, 364 airumlus, Potamonectes 88, 194, 198, 200 ajax, Gaurodytes 259 albinus, Haliplus obliquus 44, 45 Algophilus 26, 27, 30 alienus, Bidessus 88, 114, 124 alienus, Orcodytes rivalis 186 Allonychus 223 alpicola, Gaurodytes solieri 234 alpinus, Gaurodytes arcticus 245 alpinus, Oreodytes 86, 182, 183, 184,, 185 alsaticus, Haliplus 51, 64 altaicus, Gaurodytes neglectus 236, 237 amnicola, Gaurodytes 86, 219, 244 ee Gaurodytes 88, 221, 252, 253, amoenus, Gaurodytes 253 amoenus, Haliplus 44 amoenus, Scarodytes halensis 182 Amphizoa 20—22 Amphizoidae 18—20, 84 Amphizoides 20 ampliatus, Hydroporus 87, 150, 159 ampliceps, Hydroporus 155 Anagabus 207, 211, 213, 262, 263, 264 anchoralis, Potamonectes 194, 201 angulicollis, Gaurodytes 263, 264 angustatus, Gyrinus caspius 351 angustatus, Hydroporus 86, 149, angusticollis, Gaurodytes 230 angustior, Ilibius 87, 276, 280, 284 angustulus, Ilibius cinctus 283 angustulus, Noterus 88, 94, 95 annulatus, Gaurodytes 227 Anodocheilus, 122 Anopheles 82 antidotus, Hydroporus 152, 167 Apator 78, 85, 214, 266 apicalis, Haliplus 30, 49, 54, 58, 62 apicalis, Hydroporus palustris 157 apicalis, Ilybius 88, 277, 282, 283 apicicornis, Laccophilus 88, 100, 102, 104 arabicus, Haliplus lineaticollis 48 arcticus, Gaurodytes 83, 86, 220, 245 arcticus, Hydroporus 86, 146, 148 arcticus, Hydroporus tomentosus 148 Arctodytes 86, 214, 265 arcuatus, Graptodytes pictus 179 armeniacus, Coelambus 88, 131, 133, 137 armeniacus, Gaurodytes glacialis, 229 asiaticus, Cybister, 334 assimilis, Potamonectes 86, 194, 199 Asternus 212 ater, Colymbinectes 284 ater, Dytiscus 275 ater, Haliplus Jaminatus 67 ater, Ilybius 87, 275, 277, 278 aterrimus, Hydroporus puboscens 165 aterrimus, Platambus 271, 272 Aulonogyrus 342, 343, 344, 345 austriacus, Graphoderes 88, 314 avajevi, Coelambus 140 154 * Synonyms and names lower than species are shown in italics; bold lettering indicates higher units (above genus) and refers to pages giving the main description. 391 badeni, Canthydrus notula 97 basalis, Gaurodytes 88, 214, 215, 224, 225—228 basinotatus, Haliplus 30, 66, 74 beckmanni, Haliplus lineaticollis 47 behningi, Graptodytes veterator 180 bellieri, Orectochilus villosus 361, 363 bergi, Gaurodites congener 247, 248 bertoliniit, Graphoderes cinereus 316 bicarinatus, Dytiscus 122 bicarinata, Yola 122 bicolor, Gyrinus 350 bicolor, Hydroporus 152, 167 biconnatus, Graphoderes zonatus 316 Bidessini 79, 106, 112 Bidessus 83, 85—88, 91, 112, 113—122 Bidessus 123 bieneri, Graphoderes 88, 314, 315 bifarius, Apator 78, 85 bifarius, Gaurodytes 266 biguttatus, Gaurodytes 87, 224, 227, 228 biguttulus, Gaurodytes 87, 218, 240 bilineatus, Graphoderes 87, 314, 315 bilineatus, Graptodytes 86, 179, 181 bilineatus, Dytiscus 313 bipustulatus, Gaurodytes 85, 214, 216, 217, 232, 233, 234 bipustulatus Gaurodytes solskyi 233 bisbiguttatus, Hydroporus nigrita 169 bistriatus, Rhantus 85, 286, 291 blatta, Gaurodytes 215, 225 bodemeyeri, Hydroporus 149, 155 borealis, Gaurodytes 251 borealis, Oreodytes 86, 183, 184, 185 boreellus, Gaurodytes biguttulus 240 borysthenicus, Potamonectes depressus 204 bowringi, Hydaticus 306, 310 brandti, Gaurodytes 215, 225 brevis, Cybister 333 brevis, Haliplus 74 brevis, Hydroporus 86, 152, 168 breviusculus, Hydroporus 86, breviusculus, Laccornis 178 browneanus, Haliplus 62 brucki, Hydroporus 152, 165 brunneus, Eriglenus 268 Brychius 26, 27, 29—32, 38, bungei, Hydroporus tartaricus 162 36, 37, 214, 215, 150, 159 39—43 caesus, Peltodytes 30, 32—35, 38, 47 ? callosus, Gaurodytes 234 caminarius, Hydroporus 162 canaliculatus, Acilius 87, 318, 319 Canthydrus 97, 98 canus, Hydroporus 191 Carabidae 20, 22, 83, 84, 337 Caraboidea 17, 81, 341 caraboides, Gaurodytes 88, 215, 225 caspius, Coelambus 88, 132, 142 caspius, Gyrinus 342, 348, 350, 351 caspius, Gyrinus 354 castaneus, Gaurodytes 229 catascopium, Potamonectes _ griseostria- tus 196 caucasicus, Hydroporus jonicus 159, 160 caucasicus, Platambus maculatus 274, 272 celox, Gyrinus 350, 351 cerisyi, Potamonectes 87, 194, 197, 198 chalconotus, Gaurodytes 87, 218, 237, 238 chalybeatus, Ilybius 279 a Cybister lateralimarginalis, 335, chinensis, Coelambus 131, 133, 135, 136 chinensis, Copelatus 208, 209 chinensis, Gaurodytes 222, 256 chinensis, Haliplus 66, 75 ? chinensis, Ilybius 283 chinensis, Orectochilus 361, 365 chloroticus, Laccophilus 105 cineticollis, Gaurodytes 236 cinctus, Ilybius 83, 88, 277, 283 cinereus, Graphoderes 85, 314, 316 circumflexus, Dytiscus 87, 321, 323, 324, 329, 330, 331 circumcinctus, Dytiscus 87, 321, 324, 9 circumflua, Hygrobia tarda 25 Clavicornia 341 clavicornis, Agabus 86, 269, 270 Сота Noe в pu clypealis, Ga A , 200, 251 clypealis, о 110 Clypeodytes, 123, 112 Cnemidotus 33, 37 Coelambus 83, 85—88, 91, 129, 130, 144 collaris, Gaurodytes arcticus 245 collaris, Hygrotus versicolor 128 collocallosus, Copelatus 208, 209 Colymbetes 82—88, 92, 274, 295, 296— 304 Colymbetes 224, 229, 294 Colymbetina 92 Colymbetinae 84, 90, 206 Colymbetini 207, 274 Colymbinectes 274, 283, 284 colymbus, Gyrinus 342, 348, 353 colymbus, Gyrinus 354 concinnus, Aulonogyrus 342—344 concinnus, Gyrinus 344 congener, Gaurodytes 85, 214, 219—221, 243, 247, 248—252, 254 confinis, Gaurodytes 87, 222, 257 confinis, Haliplus 30, 33, 44, 46 confluens, Coelambus 87, 132, 134, 144, 142 124, 125, conformis, Dytiscus marginalis 327 confusus, Bidessus 88, 113, 118 confusus, Hydroporus 118 conifer, Peltodytes rotundatus 35, 37, 38 conjuncta, Hygrobia tarda 25 conjunctus, Hygrotus versicolor 128 conspersus, Gaurodytes 87, 214, 223, » 264 conspicuus, Gaurodytes 220, 246 consputus, Rhantus 88, 286, 293 continentalis, Hydaticus 312 convezior, Hydroporus 169 convexiusculus, Gyrinus 349, 354 converiusculus, Noterus clavicornis 95, 96 392 Copelatinae 84 Copelatini 206, 207 Copelatus 87, 88, 91, 207, 208—211 cordaticollis, Gaurodytes 264 cordaticollis, Hydronebrius 88 cordatus, Graptodytes pictus 179 coriaceus, Gaurodytes thomsoni 248 corpulentus, Coelambus 88, 131, 138, 139 corpulentus, Coelambus 138 corpulentus, Gyrinus 352 costulatus, Gaurodytes 86, 221, 248, 249 coxalis, Bidessus saucius 119 coxalis, Gaurodytes 86, 216, 223, 258, 259 crassicornis, Noterus, 85, 94, 95 crassus, Ilybius 86, 275, 278 cribratellus, Mathles 206 cribrosus, Hydroporus 123 cristatus, Brychius 30, 39, 41, 42 cruciatus, Graptodytes pictus 179 Culex 82 curtus, Gyrinus 348, 353, 356 cuspidatus, Hydrovatus 87, 110, 111 Cybister 81, 87, 88, 92, 332, 333—337 Cybisterini 79, 81, 84, 302, 332 Cymatopterus 295 czerskil, Dytiscus 86, 323, 328 dahuricus, Colymbetes 86, 296, 297 daisetsuzanus, Gaurod 222, 255 dalmatinus, Haliplus fulvus 69, 70, 72 dalmatinus, Hygrotus 127 a ae Dytiscus 83, 88, 324, 330, 331, 33 dauricus, Orectochilus villosus 361, 363 dauricus, Oreod 86, 183, 184 dauricus, Peltodytes 37 davidi, Amphizoa 22 davisi, Oreodytes 185 decempunctatus, Dytiscus 270 decoratus, Hygrotus 86, 126 decoratus, Hyphydrus 126 degeneratus, Hydaticus 309, 310 dejeani, Gyrinus 342, 349, 355 delicatulus, Bidessus 114, 119 delicatulus, Hydroporus 119 delictus, Dytiscus 86, 323, 326, 328 depauperatus, Hydroporus koslovskii 170 deplanatus, Hydroporus erythrocephalus 160 deplanatus, Ilybius 283 depressus, Potamonectes 87, 194, 195, 201 Deronectes 77, 83, 86, 88, 91, 125, 188, 189—191, 193 Deronectes 197, 200, 201, 203, 204 desertorum, Gaurodytes 88, 224, 262 detectus, Hyphydrus 109 Dichonectes 212 dichrous, Gaurodytes 88, 223, 260, 264 didymoides, Gaurodytes guttatus 228, 229 difficilis, Laccophilus 100, 102, 103 dilatatus, Gaurodytes 87, 215, 229 dimidiatus, Dytiscus 87, 321, 322, 325, 326 Dineutes 340, 343. 358 Dineutini 358 discedens, Hygrotus, 126, 128 discoideus, Copelatus 208, 210 133, 393 discretus, Hydroporus 85, 152, 169 disjunctus, Dytiscus lapponicus 328 disjunctus, Hygrotus quinquelineatus 128 dispar, Gaurodytes uliginosus 242 dissimilis, Platynectes 270 distans, Dytiscus 324, 330 distinctus, Coelambus 137 distinctus, Gyrinus 342, 347, 348, 354 dolabratus, Colymbetes 83, 86, 296, 298, 299 doriae, Deronectes 88, 189, 190 dorsalis, Dytiscus 146 dorsalis, Gyrinus marinus 356 dorsalis, Hydroporus 83, 85, 146, 147 dressleri, Rhantus consputus 293, 294 Dryopidae 341 dubiosus, Gaurodytes infuscatus 257 dubius, Dytiscus circumflexus 329 duftschmidti, Bidessus 114 duodecimpustulatus, Dytiscus 187, 188 duodecimpustulatus, Stictotarsus 188 Dytiscidae 17, 18, 20, 22, 27, 29, 76, 81, 83, 84, 341 Dytiscinae 77, 80, 84, 90, 301 Dytiscini 84, 92, 302, 319 Dytiscoidea 17, 341 Dytiscus 81—88, 92, 320, 321—332 Dytiscus 25, 36, 39, 44, 51, 67, 95, 104, 403, 108, 114, 119, 122, 127, 128, 134, 136, 141, 144, 146, 147, 149, 155, 157, 160, 163, 164, 166, 179—182, 184, 187, 188, 193, 195, 199, 201, 202, 207, 208, 212, 227, 228, 232, 234, 237—239, 241, 242, 244, 245, 247, 251—260, 266—271, 275, 277, 278, 280—282, 284, 287, 289—293, 295, 297—299, 302—304, 306, 307, 311, 312—318, 332, 334, 335 edwardsi, Gyrinus 357 elatus, Graphoderes 316 elegans, Potamonectes 194, 202 elevatus, Brychius 30, 32, 38, 39, 41, 42 ellipticus, Hydroporus 158 elongatulus, Hydroporus 86, 151, 161 elongatus, Arctodytes 86 elongatus, Gaurodytes 265 elongatus, Gyrinus 351 emmerichi, Haliplus 65, 69 emmerichi, Potamonectes 193, Enhydrinae 343, 358 enneogrammus, Coelambus 83, 88, 132— 434, 143 Eretes 85, 92, 302, 303 Erctini 302 erichsoni, Gaurodytes 236 Eriglenus 85, 87, 88, 91, 212, 213, 219, 243, 244, 263, 266, 267—270 Eriglenus 243 ermaki, Gaurodytes coxalis 258, 259 erraticus, Rhantus 285, 290 erythrocephalus, Dytiscus 144, 149, 160 erydhrosephalis; Hydroporus 85, 145, 150, 1 196, 197 escalerai, Platambus 271, 272 eugeniae, Hydroporus 86, 151, 163 eversmanni. Eriglenus 268 eversmanni, Gaurodytes 258 excoffieri, Platambus fimbriatus 273 eximius, Haliplus 64, 76 exoletus, Dytiscus 284, 292 exoletus, Rhantus 85, 286, 292 exornatus, Bidessus 1414, 124 exornatus, Нуагорогиз 121 expallidus, Haliplus flavicollis 68, 69 exspectatus, Dytiscus semisulcatus 324 extinctus, Gaurodytes 259 fabricii, Hydaticus 306, 312 fairmairei, Gyrinus 347, 354 faldermanni, Gaurodytes 88, 219, 244 falkenstromi, Caurodytes ponies 254 falkenstromi, Hyphidrus 108, 110 fallax, Gaurodytes 244 fasciatus, Hygrotus inaequalis 127 femoralis, Eriglenus 268 fenestratus, Ilybius 85, 275, 277, 278 fengi, Hydaticus 312 fennicus, Hydroporus 148 ferrugineus, Hydroporus 153, 172 ferrugineus, Hyves rus 108 figuratus, Hydroporus dorsalis, 146, 147 fimbriatus, Platambus 271, 273 fimbriolatus, Platambus 88 flavicollis, Haliplus 30, 33, 64, 65, 68, 69 flavidus, Laccophilus variegatus 103 flavipennis, Hydroporus fuscipennis 166 flaviventris, Coelambus 88, 133, 143 flaviventris, Rhantus pulverosus 287 flavocinctus, Dytiscus circumcinctus 331 flavomaculatus, Hyphydrus 108, 110 flavotestaceus, Graphoderes zonatus 316 flavus, Haliplus 63 fluviatilis, Haliplus 30, 50, 55, 56, 58, 59, 60, 62, 63 formaster, Potamonectes 88, 194, 197 fortiterpunctatus, Graptodytes pictus 179 foveolatus, Gaurodytes congener 247 foveolatus, Hydroporus 145 fovestriatus, Haliplus 52 fowleri, Gyrinus substriatus 352 fractilinea, Hypophorus 129 francki, Gyrinus japonicus 349, 355, 356 frater, Potamonectes assimilis 199 friedrichi, Gavrodytes 88, 223, 264 friedrichi, Rhantus ovalis 287, 288 frontalis, Bidessus 123 frontalis, Clypeodytes 123 frontalis, Dytiscus 331 fuliginosus, Ilybius 85, 276, 277, 284, 282 fulvaster, Eriglenus 88, 267, 268 fulvicollis, Haliplus 30, 49, 54, 55, 58 fulvipennis, Gaurodytes 222, 256 fulviventris, Gyrinus 354 fulvus, Haliplus 30, 33, 42, 64, 65, 69, 70—73 funestus, Graptodytes granularis 180, 184 furcatus, Haliplus 30, 50, 55 рев, Gaurodytes 87, 223, 246, 247, fuscipennis, Hydroporus 85, 152, 166 fuscipennis, Hvdroporus pubescens 165 fuscoaenescens, Gaurodytes chalconotus 237 394 fuscorufus, Hydroporus alustris 157 fuscus, Colymbetes 85, 95, 296, 299, 300 Gaurodytes 82, 83, 85—88, 91, 241, 242, 213—266 gelidus, Gaurodytes 257 geminus, Bidessus pusillus 114, 115 gestroi, Gyrinus 349, 354 glabratus, Brychius 39, 44, 42 glabriusculus, Hydroporus 83, 86, 150, 156 glacialis, Gaurodytes 83, 88, 216, 229 glazunovi, Ga ytes 88, 215, 228 glazunovi, Hydroporus 88, 153, 174 goldschmidti, Hydroporus 88, 154, 164 goryi, Gaurodytes dilatatus 229 gotschi, Cybister 334 gracilis, C odytes 123 graellsi, Platambus maculatus 271, 272 grammicus, Hydaticus 87, 306, 310 granularis, Graptodytes 86, 178, 179, 180 granulatus, Gaurodytes 222, 256 granulatus, Noterus 95, 96 grapei, Rhantus 83, 87, 286, 294 Graphoderes 82, 83, 85—88, 92, 348, 314 Graptodytes 86, 91, 125, 126, 178, 179— 81, 183 Graptodytes 192 griseostriatus, Dytiscus 193 griseostriatus, Potamonectes 85, 193, 195, 196—198 griseus, Eretes sticticus 303, 304 пы Colymbetes dolabratus, 298, grossepunctatus, Bidessus 86, 114, 120 guerryi, Acilius 319 gnoti, Hydroporus 174, 177 uignotites 306, 311, 312 Guignotus 113 guttatus, Gaurodytes 214, 245, 228, 229 guttatus, Haliplus 65, 71, 72 guttiger, Ilybins 87, 276, 280 Gyradelphus 346 Gyrinidae 17—19, %37, 341, 342, 362 Gyrininae 343 Gyrinini 342 Gyrinodineutes 358 Gyrinoidea 18, 341 Gyrinulus 346, 347 Gyrinus 337, 341—344, 345, 346—359, 362 Gyrinus 344, 345, 360, 361 habelmanni, Hae rus pubescens 164, 165 haemorrhoidalis, pelatus 87, 207, 208 haemorrhoidalis, Dytiscus 207 haeffneri, Gaurodytes 232 haffneri, Gaurodytes adpressus 230, 244 halbherti, Haliplus confinis 46 halensis, Dytiscus 181 halensis, Oreodytes 184 halensis, Potamonectes 200 halensis, Scarodytes 87, 182 Haliplidae 18, 26, 29, 30, 81 Haliplidius 44 Haliplinus 43, 48, 49—59, 61—64 Haliplus 26—34, 38, 39, 42, 43—76 Haliplus 48 hamifer, Hydroporus kozlovskii 170 bamulatus, Bidessus 86, 113, 117 bamulatus, Hyphydrus 117 haroidi, Gaurodytes 221, 249 hedini, Cybister lateralimarginalis 335, 336 helvolus, Eretes sticticus 303, 304 hermanni, Dytiscus 25 hermanni, Hygrobia 25 Heteronychus 223 Heterosternus 173 heydeni, Haliplus 30, 33, 49, 51, 52, 64 215610, Hydaticus 306, 311 - hochhuti, Eriglenus 268 holsaticus, Haliplus 64 Homoelytrus 317 Hoplites 64, 67, 69 hoppfgarteni, Graptodytes bilineatus 184 hostilis, Potamonectes 88, 194, 200 huhni, Bidessus hamulatus 117 hummeli, Bidessus 113, 116 hummeli, Gaurodytes 221, 253 hummeli, Haliplus 30, 50, 57 hungaricus, Gyrinus distinctus 354 hyalinus, Laccophilus 85, 100, 101, 103, 104 Hydaticini 84, 302, 304 Hydaticus 82, 85—87, 92, 304, 305—312 Hydrocanthini 92, 97 Hydrocoptus 184 Hydronebrius 88, 207, 211—213, 264 Hydrophilidae 341 Hydroporidae 84 Hydroporinae 77, 81, 84, 90, 106 Hydroporini 79, 82, 83, 106, 124 Hydroporinus 145, 173, 174—177 Hydroporus 77, 83, 85—88, 91, 124, 144, 145—178 Hydroporus 117, 118, 119, 124, 123, 129, 134, 137—140, 142, 143, 177, 181, 185, 186, 188—192, 197, 198, 203—205 Hydrovatini 84, 106, 110 Hydrovatus 77, 87, 90, 110, 111, 144 Hygrobia 25, 83, 84 Hygrobiidae 18, 20, 22, 84 Ну ма 85, 86, 90, 124, 125, 126—128, 1 Hyphydrini 106 Hyphydrus 77, 85, 90, 106, 107, 108—110 Hyphydrus 111, 117, 126, 128, 155, 165 Hypophorus 124, 129 ibericus, Dytiscus 326, 327 Ilybius 83, 85—88, 92, 238, 269, 274, 275, 276—284, 294 immaculatus, Gaurodytes 259 immaculatus, Haliplus 29, 30, 33, 49, 54, 61, 63 imperfectus, Eriglenus undulatus 267 impressopunctatus, Coelambus 85, 133, 134, 135—137, 140 impressus, Eriglenus 268 impressus, Peltodytes 36 inaequalis, Dytiscus 125, 127 inaequalis, Hygrotus 85, 126, 127 inaequalis, Platambus maculatus 271, 272 incognitus, Hydroporus 86, 150, 158 130, incognitus, Rhantus 286, 292 infuscatus, Gaurodytes 85, 222, 257 infuscatus, Potomonectes 203 inguttatus, Gaurodytes 229 inornatus, Haliplus 54 inornatus, Platambus maculatus 271, 272 inscriptus, Coelambus 132, 140 insignis, Potamonectus 195, 205 insolatus, Rhantus exoletus 292 insolens, Amphizoa 21, 22 insolitus, Gaurodytes 218, 241 interjectus, Graphoderes zonatus 316 interjectus, Ha Aplus 30, 51, 61 ?intermediatus, Ilybius 282 и, Brychius cristatus 39, 41 intermedius, Graphoderes cinereus 316 intermedius, Hydroporus 166 intermedius, Peltodytes 30, 33, 37 interruptefasciatus, Bidessus 118 interruptus, Eriglenus undulatus 267 Tsonotus 311 istrus, Graphtodytes granularis 180, 181 involvens, Orectochilus 342, 361, 362, 363 involvens, Orectochilus 364 jacobsoni, Gaurodytes 87, 219, 242, 244, 249, 250 jacobsoni, Hydroporus 88, 174 jakovlevi, Graptodytes 192 jakovlevi, Haliplus 54 jakovlevi, Neonectes 88 kovlevi, Neoporus 86 japonicus, Bidessus 88, 113, 115, 416 japonicus, Co elatus 88, 208, 209 japonicus, Cybister 88, 333, 336 japonicus, Gaurodytes 222, 254, 255 japonicus Reg., Gaurodytes 254 japonicus, Gyrinus 342, 349, 353, 355, 356 aponicus, Haliplus 50, 56 japonicus, Hydrovatus 111 japonicus, Hyphydrus 108, 109 onicus, Noterus 95, 96 Je olensis, Gaurodytes 216, 230 jonicus, Hydroporus 88, 150, 159. jordanis, Cybister lateralimarginalis 335, 336 kanoi, Oreodytes 183, 185 kansou, Cybister 337 kansouis, Platambus 273 kashmirensis, Potamonectes 198 kaszonensis, Scarodytes halensis, 182 kessleri, Gaurodytes 266 kiesenwetteri, Gaurodytes solieri 234 kobensis, НЕ 100, 105 koenigi, Coelambus 88 koenigi, Colymbetes 83, 296, 298 kolstromi, Hydroporus 147 kokoosson, О 262 kokujevi, Colymbetes 300 koreanus, Copelatus 208, 210 kotulae, Acilius canaliculatus 319 kozlovskii, Hydroporus 83, 88, 153, 170 kriiperi, Gyrinus dejeani 349, 355 395 kurilensis, Gaurodytes 86, 220, 246 kisteri, Laccophilus hyalinus 101 labiatus, Dytiscus 266 labiatus, Eriglenus 85, 219, 244, 267, 268 Laccophilinae 90, 98 _ и 82—85, 87, 88, 91, 98, 100— 10. Laccornis 86, 125, 177, 178, 205 laevigatus, Haliplus transversus 62 laevipennis, Hydaticus 87, 305, 308, 309 laevis, Noterus 95 gang Hydaticus transversalis 309, 31 laevisulcatus, Acilius 319 laeviusculus, Hydaticus 86, 305, laeviventris, Hyphydrus 107, 108 laeviventris, Potamonectes 195, 204 laeviventris, Potamonectes 198 laminatus, Haliplus 30, 65, 67 lapponicus, Dytiscus 87, 323, 328, 329 lapponicus, os 86, 220, 243, 308 9 9 lapponicus, tly blue subaeneus 279, 280 lapponum, Haliplus 30, 65, 70 lapponum, Hydroporus 86, 146, 147 lateralimarginalis, Cybister 87, 333, 335, 336 lateralimarginalis, Dytiseus 332 lateralis, Ilybius 86, 276, 282 latescens, Potamonectes depressus 201 luticollis, Hydroporus 86, 153, 173 laticollis, Potamonectes 195, 202 latissimus, Dytiscus 87, 321 latitans, Rhantus 87, 286, 292, 293 latro, Dytiscus 86, 324, 330 latus, Deronectes 86, 188, 189 latus, Hydroporus 188 lautus, Coelambus 141 leander, Hydaticus 87, 306, 312 lecontei, Amphizoa 21 lederi, Gaurodytes 260 lenensis, Hydroporus 161 leonhardi, Coola nae 138 leopardinus, Haliplus 72 lernaeus, Coelambus 87, 131, 137 levanderi, Ganrodytes 86, 221, 249 levanderi, Hydroporus 156 levantinus, Peltodytes caesus 36 lewisianus, Cybister 233, 335 lewisius, Laccophilus 88, 100, 104, 105 Liaphlus 30, 33, 44, 64, 65—176 Liaphlus 64 libanus, Gyrinus 348, 354 libanus, Hydroporus 153, 172 licenti, Bidessus 113, 116 limbatus, Cybister 333, 335 limbatus, Hydroporus 165 limbatus, Ilybius 282 limbibasis, Gaurodytes 263 lineaticollis, Haliplus 30, 33, 47, 48 lineatus, Gaurodytes 88, 224, 261, 262 lineatus, Graplody tes 178 lineatus, Haliplus 46 lineatus, Porhydrus 85, 186, 187 lindbergi, Haliplus 59 lineellus, Coelambus 134, 135 lineolatus Haliplus 30, 33, 54, 53, 59, 60—62 lineolatus, Haliplus 62 lineolatus, Sea 310 Liopterus litoralis, Hydaticus 307 lituratus, Hydroporus palustris 157 longicornis, Hydroporus 86, 174, 175 longipes, Deronectes 88, 189 longissimus, Gaurodytes 215, 226 longitarsis, Hydroporus 163 longitarsis, Hydroporus tartaricus 162 longulus, Hydroporus 174 loochovensis, Hydrovatus 112 luctuosus, Gyrinus 349, 355 lugubris, Hydroporus 162 luniger, Gaurodytes 260 lunulatus, Platambus 88, 271, 273 luteaster, Gaurodytes 86, 219, 243 luteicollis, Rhantus 293 luteipennis, Hydroporus umbrosus 155 luteolus, Gaurodytes 260 macrocephalus, Hydroporus 171 Macrodytes 321, 322, 324—331 maculatus, Dytiscus 271 maculatus, Haliplus 30, 66, 74 maculatus, Haliplus 58 maculatus, Platambus 85, 271, 272, 273 maculicollis, Rhantus 294 maculosus, Bidessus 114, 124 maeklini, Hydroporus dorsalis 146, 147 magnus, Colyinbetes 296, 298 marginalis, Dytiscus 82, 85, 320, 321 323, 324, 327, 328, 329, 331 marginalis, Gaurodytes 241 marginalis, Hydroporus 146, 147 marginatus, Dineutes 359 marginatus, Hydroporus 87, 145, 151, 163 marinus, Gyrinus 342, 343, 346, 349,. 350 355, ‚ 357 maritimus, Potamonectes 195 marklini, Coelambus 86, 132, 140 maurus, Bidessus unistriatus 119 maurus, Dytiscus semisulcatus 324 megacephalus, Bidessus 114, 122 Megadytes 77 melanarius, Gaurodytes 87, 217, 235 melanarius, Hydroporus 86, 174, 176 melanocephalus, Hydroporus 86, 145, 151, 156, 161, 162, 163 melanocornis, Gaurodytes 87, 218, 238 melancholicus, Hydroporus tartaricus 162 melanopterus, Rhantus excletus 292 memnonius, Hydroporus 86, 153, 174 merkli, Gaurodytes 225 Methles 205, 206 Methlini 106, 205 microthoraz, Deronectes 191 mimmi, Gaurodytes 232 minimus, Colymbetes 295, 297, 301 minor, Agabus 269 minutissimus, Bidessus 114, 118, 119 minutissimus, Hydroporus 118 minutus, Gyrinus 342, 347 396 minutus, Laccophilus 85, 98, 100, 101, 402—104 mithrae, Gyrinus 348, 353 miztus, Coelambus 140 moestus, Deronectes 191 mongolicus, Coelambus 86, 132, 133, 139 monilicornis, Hydroporus 169 montanus, Hydroporus melanarius 176 montanus, Oreodytes borealis 185 morio, Hydroporus 161 mougeli, Laccophilus minutus 104, 102 mtiula, Hydroporus 88, 151, 162 mucronatus, Gaurod 222, 255 mucronatus, Haliplus 33, 64, 66 muelleri, Haliplus obliquus 44, 45 muelleri, Laccophilus variegatus 103 muensteri Hydroporus melanarius 176 multilineatus, Potamonectes griseostriatus 195, 196 multipunctatus, Haliplus ruficollis 51, 52 multistriatus, Haliplus fulvus 69 musicus, а 129 mutinensis, Dytiscus dimidiatus 325, 326 Nartus 92, 286, 294 nasutus, Bidessus 88, 114, 120 natator, Gyrinus 342, 345, 348, 352, 353 natrix. Neonectes 192 nazius, Gyrinus urinatur 350 nebulosus, Gaurodytes 87, 214, 223, 259 Necticus 212 neglectus, Gaurodytes 87, 217, 236, 237 neglectus, Hydroporus 86, 174, 175 Neohaliplus 42, 43, 47, 48 Neonectes 88, 125, 192 Neoporus 86 Neoporus 173 niger, Haliplus lapponum 70 nigricollis, Gaur biguttatus 227, 228 nigricollis, Gauro Shoes nitidus 225, 241 nigripalpis, Gaurodytes 86, 221, 251 nigripes, Gaurodytes guttatus 228, 229 oat eydroperus 85, 146, 153, 169, О; 47 nigritarsis, Graptodytes bilineatus 181 nigritulus, Laccophilus apicicornis 102, 103 nigriventris, Gaurodytes 258 nigroaeneus, Gaurodytes 87, 242, 217, 236 me ines tos, Coelambus 88, 132, 133, nigrollneatus, Coelambus _parallelogram- mus 136, 137 nigropunctatus, Rhantus bistriatus 291 nigrovittatus, Hydaticus 310 nitidicollis, Haliplus lineaticollis 47 nitidus, Gaurodytes 224, 225, 228, 229, 241 nitidus, Gaurodytes biguttatus 227, 228 nivalis, Hydroporus 153, 170 nobilis, Neonectes 192 потах. Haliplus 60, 62 nonconjunctus, Hydaticus bowringi 310, 311 nonsulcatus, Dytiscus pisanus 326, 327 norvegicus, Brychius 40, 41 notaticollis, Rhantus 87, 285, 289 notatus, Hydroporus 86, 150, 156 notatus, Rhantus 87, 285, 289, 294 ‚ ovalis, Noterinae 18, 77, 80, 90, 92 Noterini 2, 4, 7, 9, 81, 92, 93 Noterus 77, 81, 85, 88, 91, 93, 94—96 Notomicrini 77, 84 notula, Canthydrus 97 novemliner we, Coelambus 86, 132, 133. numidicus, Canthydrus notula 97 obliquefasciatus, Porhydrus 187 obliquesignatus, Porhydrus 88 obliquus, Haliplus 30, 32, 44, 46 oblitus, Gyrinus natator 352 oblongus, Laccornis 86, 177, 178 obovatus, Gaurodytes lapponicus 248 obovatus, Hydroporus 16 obscura, Potamonectes airumlus 199 obscura, Potamonectes assimilis 199 obscura, Potamonectes griseostriatus 196 obscuratus, Colymbetes 297 obscurellus, Haliplus obliquus 44, 45 obscuriceps, Orectochilus 361, 364 obscuricornis, Hydroporus melanarius 176 obscurior, Gaurodytes fuscipennis 258 obscuripennis, Gaurodytes 248 obscurus, Dytiscus dauricus 331, 332 obscurus, Hydroporus 86, 151, 160 obscurus, Ilybius 279 obscurus, Laccophilus 101 obsoletus, Haliplus variegatus 72 obsoletus, Hydroporus 153, 172 obtusipennis, Hydroporus 147 obtusus, Ilybius 86, 276, 280, 281 ochoticus, Gaurodytes arcticus 245 ogasawarensis, Copelatt 208, 209 ommani, Gaurodytes 215, 226 opacinus, Aulonogyrus concinnus 344, 345 opacinus, Hydroporus jonicus 159 opecus, Bidessus unistriatus 119, 120 opacus, Coelambus chinensis 135, opacus, Gaurodytes 86, 216, 232 opacus, Gyrinus 342, 350, 358 opacus, Gyrinus 357 opacus, Hydroporus tartaricus 162 opatrinus, Deronectes 191 optatus, Gaurodytes 88, 218, 240, 241 Orectochilinae 343, 360 Orectochilini 362 Orectochilus 340—343, 360, 361—365 eS hog 39, 83, 86, 91, 125, 182, 183— 186 136 orientalis, Cybister tripunctatus 334 orientalis, Dineutes 342, 343, 359 orientalis, Gaurodytes 220, 246 orientalis, Gyrinus 349, 356 orientalis, Eyphydrus 108, 109 orientalis, Hyphvydrus 109 ornatus, Canthydrus 97, 98 orthogrammus, Coelambus ovalis, Gaurodytes 240 ovalis, Haliplus 65, 71 ovalis, Ilybius 85, 276, 281 Rhantus 285, 287 ovatus, Hyphydrus 85, ovatus, Ilybius 279 lernaeus 137 106, 107. 108 397 Pallobius 25 palaestinus, Gaurodytes 216. 230 palaestinus, Potamonectes 195 pallens, Coelambus marklini 140 pallens, Eriglenus labiatus 268 pallens, Haliplus confinis 46 pallens, Hydroporus 163 : pallescens, Hydroporus planus 164 pallida, Potamonectes airumlus 199 pallida, Potamonectes griseostriatus 196 pallidior, Haliplus 72, 73 pallidivestis, Rhantus bistriatus 291 pallidipennis, Gaurodytes 224 pallidulus, Coelambus 87, 132, 142 pallidulus, Laccophilus apicicornis 102, 103 pallidus Roberts, Haliplus 53 pallidus Sahlb. ep us lineaticollis 47 pallidus Sem., Haliplus 68 paludosus, Gaurodytes 87, 214, 218, 219, 221, 241, 242, 249, 250 palustris, Hydroporus 85, 145, 150, 156, 157, 158—160 parallelogrammus, Coelambus 87, 133, 134, 136, 137—139 parallelus, Copelatus 208, 210 parallelus, Hydroporus 175 Parasternus 217 Parasternus 212 parumpunctatus, 131, Laccophilus variegatus parvicollis, Deronectes 88, 189, 190 parvicollis, Deronectes 191 parvulus, Hygrotus inaequalis 127 Patrus 360, 361, 365 pauper, Gaurodytes biguttatus 227 paykulli, Colymbetes 83, 87, 296, 297 paykulli, Gyrinus 342, 347, 350 pectoralis, Coelambus 88, 133, 143 pectoralis, Hydroporus 168 Pelobiini 22, 2 Pelobius 25, 84 pelopis, Haliplus 66, 72 Peltodytes 27—31, 33, 34—38, 43, 47 perforatus, Bidessus 123 perforatus, Clypeodytes 123 persicus, Deronectes 191 persicus, Dytiscus 88, 323, 327 pervasus, Graptodytes bilineatus 181 piceolus, Gaurodytes tristis 235 piceus, Colymbetes 301 piceus, Gaurodytes blatta 225 piceus, Hydroporus 68, 149, 154 pici, Haliplus lineaticollis 47, 48 picicornis, Hydroporus 86, 174, 176, 177 et Gaurodytes bipustulatus 232, Piciventris, Graphoderes 86, 314, 317 pictipennis, Platambus 271, 272 pictus, Eriglenus undulatus 267 pictus, Graptodytes 86, 126, 179 pilipes, Hydroporus 162 в, Potamonectes griseostriatus 195, pisanus, Dytiscus 321, 323, 325, 326, 327. 328 planicollis, Deronectes 190 planus, Hydroporus 85, 146, 154, 164 Platambus 85, 88, 94, 212, 2741, 272—274 Platynectes 212, 240, 270 politus, Canthydrus 97, 98 politus, Dineutes 358 politus, Gyrinus orientalis 356 polonicus, Coelambus 86, 130, 133, 134 pomeranus, Bidessus hamulatus 147 ponticus, Cybister 335, 336 ponticus, Hydaticus 306, 312 ponticus, Hydroporus discretus 169 ponticus, Laccophilus 100, 105 ponticus, Noterus 95, 96 va iusi, Ilybius 86, 275, 278 orhydrus 85, 88, 125, 186, 187 Potamodytes 193 Potamonectes 83, 85—88, 91, 125, 193 194—205 pratensis, Gaurodytes nebulosus 259 prescotti, Ilybius fenestratus 277 Protohaliplus 47 pseudoclypealis, Gaurodytes 87, 221, 250 рев, Graptodytes granularis 180, pseudopubescens, Ну@горогиз 160 pubescens, Ну@горогиз 85, -145, 164, 165, 166, 167 pulchellus, Bidessus hamulatus 117 pulchellus, Platambus maculatus 271, 272 pullatus, Gyrinus 343, 350, 357 pulverosus, Rhantus 85, 285, 287, 288 punctatissimus, Hydroporus 86, 150, 160 punctatus, Rhantus 286, 290 punctatus, Rhantus 287 puncticeps, Coelambus 143 punctipennis, Gaurodytes 245 punctipennis, Hydroporus 86, 153, 173 punctipennis, Orectochilus 342, 361, 363 punctulatus, Dytiscus 324 pusillus, Bidessus 85, 112, 113, 114 pusillus, Dytiscus 114 152, quadriguttatus, Ilybius 87, 275, 277, 279 quinguedneatus, Hydrotns 86, 126, 127, quinquelineatus, Hyphydrus 128 Rantogiton 294 recidivus, H Greporus goldschmidti 164 rectus, Methles regalis, Gaurodytes 234 regimbarti, Gaurodytes 221, 253 regimbarti, Haliplus 66, 74 regimbarti, Orectochilus 361, 364 regimbarti, Rhantus 285, 288 - reitteri, Coelambus 88, 132, 142 reitteri, Orectochilus 364 remotus, Gaurodytes bipustulatus 232, 233 rhantoides, Hydaticus 312 Rhantus 82, 83, 85, 87, 88, 92, 259, 274, 284, 285—295, 306, 311, 312 tivalis, Oreodytes 86, 184, 186 robertsi, Haliplus 30, 49, 53 roborovskii, Coelambus 130, 135 398 rosenbergeri, Graphoderes zonatus 316, 317 reseni, Hydroporus pubescens 165 rossicus, Brychius cristatus 30, 39, 41 rotundatus, И 129 rotundatus, Peltodytes 35, 37 rubidus, Haliplus 76 rubripes, Hydroporus 148 ruficeps, Eriglenus undulatus 267 ruficollis, Copelatus 208 ruficollis, Haliplus 28, 30, 33, 49, 54, 53, 54, 59, 60, 62 ruficollis, Rhantus pulverosus 287 rufifrons, Hydroporus 85, 153, 166 rufipennis, Gaurodytes 222, 254, 255 rufiventris, 1lybius subaeneus 279 rufus, Hypophorus 129 rufus, Rhantus 88, 286, 293 _ rugosipennis, Gaurodytes nebulosus 259 rugosus, Hydaticus 86, 305, 309 rugosus, Hydaticus 308 sacha, Hydroporus 156 sachalinensis, Gaurodytes 86, 216, 232 saghalienus, Hydroporus 86, 152, 166 saginatus, Coelambus 88, 131, 138, 139 sahlbergi, Deronectes 189, 190 sahlbergi, Haliplus 60—62 sahlbergi, Hydaticus 309 sahlbergi, Gaurodytes 230 sahlbergi, Graphoderes piciventris 317 samojedorum, Haliplus 30, 50, 57, 62 sanmarki, Oreodytesrivalis 186 sanmarki, Oreodytes 184 satunini, Gaurodytes 237 saucius, Bidessus 114, 119 sauteri, Haliplus 50, 56 sawadai, Gaurodytes 262 scalesianus, Hydroporus 86, 149, 153 Scarodytes 87, 125, 181, 182 schatzmayeri, Gyrinus substriatus 352 schaumi, Haliplus 30, 50, 58 ee Hydaticus 87, 305, 307, 30 schmidti, Gaurodytes coxalis 258, 259 scholzi, Gaurodytes 251 scholzi, Hydro porus nivalis 170 Scotodytes 219 Scythodytes 219 scythus, Potamonectes cerisyi 197 semenovi, Coelambus 134, 137 semenovi, Colymbetes 88, 296, 300 semenovi, Gaurodytes 88, 262, 263 semenovi, Hydroporus tartaricus 162 semicirculatus, Rhantus notatus 289 semicostatus, Dytiscus marginalis 327 semilineatus, Hygrotus versicolor 128 seminiger, Dytiscus 304 seminiger, Hydaticus 87, 305—309 semirufus, Colymbetes fuscus 299, 300 а, Dytiscus 87, 321, 322, 324, sepleninionalis, Dytiscus lapponicus 328, septentrionalis, Oreodytes 86, serricornis, Agabus 86, 269 serricornis, Dytiscus 269 183, 185 setulosus, Gaurodytes 86, 221, 252 sexguttatus, Bidessus saucius 119 sexmaculatus, Graptodytes pictus 179 sharpi, Dytiscus 322, 325 sharpi, Gaurodytes 86, 216, 231, 232 sharpi, Haliplus 66, 74, 75 sharpi, Laccophilus 100, 105 sharpi, Rhantus 288 sibiricus, Gaurodytes sharpi 231 sibiricus, Gaurodytes 245 sibiricus, Haliplus 30, 51, 60, 61, 62 sibiricus, Haliplus 59 sibiricus, Hydroporus 86, 153, 172, 173 sibiricus, Hydroporus 146 sibiricus, Orectochilus 364 siculus, Canthydrus notula 97 sieversi, Hydroporus 161, 162 signatellus, Bidessus 87, 113, 117 signatellus, Hydroporus 117 sikkimensis, Rhantus 285, 287 similis, Cybister tripunctatus 334 similis, Ilybius 87, 276, 279 simplex, Haliplus 30, 66, 73 simplicipes, Potamonectes 195, 204 simulator Noterus crassicornis 95 simulator Graphoderes cinereus 316 simulator, Rhantus bistriatus 291 sinensis, Acilius 318, 319 ? sinensis, Dytiscus 330 sinensis, Peltodytes 35, 37 sinuaticollis, Gaurodytes 222, 253 sinuatus, Platambus 273 slovzovi, Gaurodytes 88, 220, 245 sogdianus, Gaurodytes 88, 263 solieri, Gaurodytes 83, 86, 244, 217, 234 solskyi, Gaurodytes 88, 217, 233 solskyi, Gaurodytes bipustulatus 233 solutus, Laccophilus 100, 105 songoricus, Gaurodytes 224 sparre-schneideri, Haliplus fulvus 69, 70 Spinosodineutes 358 spinosus, Methles cribratellus 206 splichali, Gaurodytes 258 ? springeri, Hydroporus 159 stadleri, Dytiscus 330 stagnalis, Hydaticus 85, 304, 306, 307, 30 stagnalis, Hydaticus laevipennis 308 stearinus, Potamonectes 88, 195, 203 steppensis, Potamonectes cerisyi 197 Sternoporus 173 sticticus, Dytiscus 302 sticticus, Eretes 85, 302, 303 Stictotarsus 125, 187, 188 striatus, Aulonogyrus 344, 345 striatus, Colymbetes 87, 296, 297, 298, 299 striatus, Dytiscus 295 striatus, Haliplus 54 strigulosus, Copelatus 210 strigulosus, Gyrinus 353 striola, Hydroporus 86, 150, 158, 159, 160 striola, Hydroporus 159 striolatus, Gaurodytes 217, 234 striolatus, Gyrinus 358 strémi, Laccophilus minutus 101, 102 399 sturmi, 220, Gaurodytes 87, 214, 219, ‚ 245 stygius, Gaurodytes 218, 240 styriacus, Gaurodytes guttatus 228, 229 styriacus, Hydroporus palustris 157, 158 subaeneus, Ilybius 85, 276, 277, 279 subalpinus, Hydroporus 169 subcostatus, Hydroporus 160 subhumeralis, Hydroporus pubescens 165 sublaevis, Hydroporus discretus 169 submuticus, Hydroporus 86, 146, 148 subopacus, Rhantus suturellus 290, 291, subparallelus, Rhantus rufus 293 subquadratus, Gaurod 230 subrufulus, Bidessus unistriatus 119 subseriatus, Hydroporus 162 substriatus, Gyrinus 340, 342, 343, 346, 354, 352, 353, 355, 356 subtilis, Gaurodytes 87, 217, 236 succinctus, Eretes sticticus 303, 304 suffriani, Gyrinus 342, 348, 351 suffusus, Haliplus lineaticollis 47, 48 я Cybister 333 sulcatus, Acilius 85, 318, 319 sulcatus, Dytiscus 317 sulphuricola, Potamonectes 83, 88, 194, 200 sumakovi, Hydroporus 168 Suphisini 84 Suphrodytes 145, 146, 147, 148 suturalis, Graptodytes granularis 180, 184 suturalis, Rhantus 286 suturalis, Rhantus 289 suturellus, Rhantus 85, 286, 290, 291, 294 svenhedini, Gaurodytes 215, 225, 227 syriacus, Haliplus variegatus 72, 73 syriacus, Orectochilus villosus 361, 363 szechuanensis, Gyrinus natator 352 tarda, Hygrobia 25 tartaricus, Hydroporus 86, 151, 162, 163 ? tataricus, Cybister 335 tauricus, Coelambus 143 teranishii, Copelatus 208, 210 tessellatus, Hydroporus 87, 152, 167 testaceus, Laccophilus hyalinus 101 tctragrammus, Bidessus 4117 thermalis, Bidessus signatellus 147 Thermonectini 302, 313 thermonectvides, Hydaticus 306, 312 thianschanicus, Dytiscus 323, 329 thomsoni, Colymbetes dolabratus 296, 298, 299 thomsoni, Gaurodytes 86, 220, 248 thomsoni, Gyrinus 357 tibetanus, Gaurodytes 221, 250 tibetanus, Hydroporus 153, 169 tianshanicus, Dytiscus 88 tinctus, Hydroporus palustris 157 tokunagai, Bidessus 124 tolli, Colymbetes 86, 296, 299 tomentosus, Acilius 348 tomentosus, Hydroporus 86, 146, 148 tomentosus, Hydroporus arcticus 4148 torrei, Rhantus bistriatus 294 transcaucasicus, Eriglenus 268 transgrediens, Hydroporus pubescens 165 transversalis, Hydaticus 87, 305, 306. 308, 309, 310 transversalis, ры dorsalis 146, 147 от ydaticus bowringi 310, 341 transversus, Haliplus 30, 51, 60 62 transversus, Haliplus 52, 64 transvolgensis, Haliplus 74 trassaerti, Bidessus japonicus 115 trilineatus, Coelambus 144 tripunctatus, Cybister, 88, 333, 334 tristis, Gaurodytes 86, 217, 235 tristis, Hydroporus 85, 149, 155, 156 tristis, Hydroporus 155 tschitscherini, Colymbetes 297, 300 tungus, Hydroporus tartaricus 162 tunkunensis, Gaurodytes 248 turca, Potamonectes 88, 195, 203 turkestanicus, Ilybius fuliginosus 281, 282 uliginosus, Dytiscus 212 uliginosus, Gaurodytes 87, 219, 222, 242, 244, 255 umbrosus, Hydroporus 83, 86, 149, 155, 156 undulatus, Eriglenus 87, 267, 268, 269 unguicularis, Coelambus 134 unguicularis, Gaurodytes 87, 218, 239, 240 unicolor, Graptodytes granularis 180, 184 unicolor, Gaurodytes guttatus 228, 229 unicolor, Hydrotus decoratus 126, 127 unicolor, Porhydrus lineatus 187 unidentatus, Dineutes 340, 350 uniformis, Laccophillus 102 unistriatus, Bidessus 86, 114, 119, 120 unistriatus, Dytiscus 112 urgensis, Coelambus 88, 131, 138 urinator, Gyrinus 342, 347, 350 uzbekorum, Coelambus 88, 132, 133, 140 vagans, Colymbetes 301 vagelineatus, Laccophilus 88, 100, 104 vagepictus, Hydroporus jonicus 159 valesiacus, Hydroporus palustris 157 validus, Dytiscus 322, valliger, Hydroporus 86, 151, 163 variabilis, Gyrinus urinator 350 variabilis, Peltodytes 37 varians, Graptodytes 184 variegatus, Haliplus 30, 33, 54, 66, 71. 72, 73—75 variegatus, Hyphydrus ovatus 108 variegatus, Laccophilus 87, 100, 103, 104 variegatus, Potamonectes 88, 195, 203 variegatus, Potamonectes 203 variolosus, Laccophilus 101 varius, Haliplus 30, 44, 45 Vatellini 84 ventralis, Dytiscus 331 venturii, Gaurodytes congener 247, 249 verrucifer, Graphoderes piciventris 317 versicolor, Dytiscus 128 versicolor, Hygrotus 86, 126, 128 vestitus, Deronectes 88, 194 400 veterator, Graptodytes 179, 180 vibicicollis, Rhantus 287 villosus, Gyrinus 360 villosus, Orectochilus 340, 342, 360, 361— 364 virgulatus, Rhantus notatus 289 vittatus, Coelambus 88, 131, 136 vittatus, Hydaticus 306, 311 vittiger, Gaurodytes 86, 218, 238 vittula, Hydroporus 158 wankowiczi, Gyrinus 352 wasastjernai, Gaurodytes 86, 216, 231 watanabei, Hydroporus 153, 170 weberi, Haliplus 6 wehnckei, Haliplus 59 winkleri, Gaurodytes biguttatus 227, 228 worndlei, Hydroporus discretus 169 Xanthodytes 223 yessoensis, Rhantus 285, 290 Yola 112, 122 yoshimurai, Bidessus 113, 116 zaitzevi, Gaurodytes 86, 219, 243 zaitzevt, Gaurodytes 243 zaitzevi, Hydroporus 168 zeravshanicus, Orectochilus 342, 361, 364 zetterstedti, Gaurodytes 86, 220, 245, 246 zimmermanni, Copelatus 208, 211 zimmermanni, Eriglenus 267, 268 zimmermanni, Haliplus 69 zimmermanni, Hydroporus 152, 167 zonatus, Graphoderes 83, 87, 314. 316, 317 401 Tor sha? 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