E、l't1・a,T()kyo,21(1):179-186,May15,1993 TwoNewEndogeanTrechines(Coleoptera,Trechinae) from theShirakamiMountains,NortheastJapan1) Shun-lobi UEN0 DepartmentofZoology,NationalScienceMuseum(Nat.Hist), 3-23-1Hyakunin-cho,Shinjuku,Tokyo,169Japan Abstract Two new endogeanspecies of trechinebeetlesaredescribed from the Shirakami Mountains in northeastern Honshu,Japan. One of them is related to 0'ohio〃ulscae(・usandisnamed 0.yamauchil. Theotherisamemberof thegenus Kul'asawatre('1/us(s.lat),butiswidelyisolatedfromalltheothercongenerspreviously describedfromJapan. It isnamed K.,1ishlkawal. TheShirakami Mountains(alsocalledShiragami Mountains)areanon-volcanic rangestretchinglatitudinallyonthebordersofAomoriandAkitaPrefecturesonthe JapanSeasidenear thenorthernendofHonshu,NortheastJapan. The mountain rangeisnotparticularlyhigh,onlyattainingtot,243matthehighestpoint,butisex- tensivelycoveredwithprimevalbeechforestsnownotcommonintheJapaneseIslands. Forthisreason,thegreaterpartofthemountainrangeisprotectedasanationalnature conservation area and isselected as a candidate of the world cultural and natural heritage. Theinsect faunaofthismountainrangehasnotbeenintensivelyinvestigatedas yet. However, recent fieldsurveysmadebymyselfandmy friendshaverevealed that atleast threenewspeciesoftrechinebeetlesoccur there,anoculatespeciesofTi・fe(・/11- ama belonging tothegroupofT.oreas, anendogeanspeciesofOlob/emusrelated to 0. cae(us, and anendogeanspecies of Kurasawatre(,busof uncertain affinity. The latter twospecieshavesofarbeenknownfromsinglelocalitiesrespectively, whereas the7Ire(:'/llamaiswidespreadoverthemountainrangeandisvariabletosomeextent both individually and geographically. In any case, they are specifically different fromtheir relativesoccurringonMt. Iwaki-san,arecentvolcanothatstandsat the northernside of theShirakamis. Thisfactposesaninterestingproblemto theorigin of colonization by trechine beetles on recent - mostly Postglacial - volcanoes. However,itisnot thesubjectofthepresentpaper toanalysetheprocessof trechine colonization of recent volcanoes. Itspurpose is to introduceintoscience the new species of Orob/emus and Kurasawatre(・:bus apparently endemic to the Shirakamis. Theotherspecies,anocuIateTrechiama,willbedescribedinaseparatepaper tobe published in near future. 1)ThisstudyissupportedbytheGrant-in-aidforScientificResearchNo.03640633 fromtheMin- istryofEducation,ScienceandCulture,Japan. 180 Shun-lobi UENo Theabbreviationsemployedin thispaperarethesameasthoseexplainedinpre- viouspapersofmine. Beforegoingfurther,IwishtoexpressmydeepappreciationtoProfessorYoshiaki 「、一' lsHIKAwA, Messrs. AzumaABE,SatoshiYAMAUcHIandSeiji MORITAfor their kind- nesseitherinhelpingmeinthefieldworksorinsupplyingmewiththematerials. Orob1,emusyamauctutS. UEN0,sp nov (Figs.1-2) Length:3.15-3.55mm(fromapicalmarginofclypeustoapicesofelytra). Closelyallied to 0. (aecusS. UENoet A.YosHIDA(1966,p 80,figs. 1-2; UENo, 1983, p.159, 1985,p 85,pi t6,fig 7)andexternallysimilar tothelatterineveryde- tail, withtheexceptionofsmaller fore-body. Colour as in 0. caecus. Head and pronotumsimilar tothosein0.caecus;antennaereachingbasalthirdofelytrain , basal two-seventhsof elytrain ;pronotumwidestataboutseven-tenthsfrombase, wjththesidesdistinctlysinuateatalevelbetweenbasalseventhandsixth;PW/HW 125_1.31 (MI27),PW/PL121-1.32(MI27),PW/PA t34-1.39(MI37),PW/PB 132_1.42(MI37),PA/PB0.97-1.04(MO99) [PB/PA0.96-1.03(M].01)]. Elytra largerthanin0.caecusthoughsimilarinconformationtothoseofthelatter,withthe sjdesalittlemoredistinctlyarcuate;EW/PW146-1.53(MI50),EL/EW154-1.62 (MI58). Ventralsurfaceandlegsasin 0. ('aecus. Malegenitalorgansmallandlightlysclerotized,evidentlydifferingfromthatof 0.caec・usinbeingmoreelongateandventrallycurvedat theaedagaIapex. Aedeagus about two-seventhsaslongaselytra,moderatelycompressedinbasalhalf,moderately curved ventradinbothbasalandapical thirds,andhardlyarcuateatmedianthird; apjcalorificesomewhatasymmetrical,withmorereducedleftwall;basalpartelongate, vvjth fairlylargebasal orificewhosesidesareshallowlyemarginate;sagittal aileron welldevelopedthoughrathernarrow;vieweddorsally,apical lobesymmetrical,grad- uallynarrowed towardsnarrowly roundedapex; viewed laterally, apical lobenar- row, curved ventrad, and blunt at theextremity; ventral margin nearly straight at middlebut widelyemarginateat apical third inprofile. Inner sac armed with two slendercopulatorypieces, therightoneofwhichissmaller thanin 0.c・aecusthough still longer thantheleftpiece. Stylesrathersmall,withnarrowapicalparts,leftstyle alittlelonger thantheright,eachbearingthreeapicalsetae. Typeso,・les. Holotype: , allotype: , paratypes: 5 l 29-VIl-l992, S. , , YAMAucHl leg. The bolo- and allotypesaredeposited in thecollection of the De- partmentofZoology,NationalScienceMuseum(Nat.Hist ), Tokyo. Theparatypes are distributed to the abovecollection and the collection of the Aomori Prefectural Museum. Type/o(allり,. Mt. Shirakami-dake,1,220m in altitude, in lwasaki-mura of Ao- moriPrefecture,onthewesternsideofno・ttheasternHonshu,NortheastJapan. Notes. Thoughcloselyallied to0.(・ae(,usofMt.Iwaki-san,theShirakami-dake NewEndogeanTrechinesfromNortheastJapan 81 2 、、 / 、_- / 4 ・ o 、 / 、_ - / Figs.1_4. MalegenitaliaofendogeantrechinebeetlesfromtheShirakamiMountains;leftlateral vjew(1,3),andapicalpartofaedeagus,dorso-apicaIview(2,4). - l-2.0roblen1lisya'Ila- liff' S.UENo,sp nov., from Mt.Shirakami-dake. - 3-4. KM'asa a「''ee/71's ls1/1 ｽ a1 S. UENo,sp nov.,「romTowada-yamainOhwani-machi. populationof01・ob/enulsisspecificallydifferent「ron,thelwaki-sanpopulationbeyond all doubt. When theShirakami-dakespecimenscametomyhand, however, l had onlythreespecimensof 0.caecus,whichwerenotsufficient todeterminetheran9eof individual variation. l thereforevisitedMt.1waki-sanagainonSeptember24,1992, and withtheaid ofNlsHIKAwAand YAMAucHl,succeededin obtainingfiveadditional specimens(3 2 )exactlyatthesamespotthatthetypematerialhadbeendis- , covered. Thjscollectionenabledmetomakeacomparativestudyonasounderbasis, andtodrawafinalconclusionthatthetwopopulationsrepresenttwodifferentspecies. Thetypespecimensof 0.J,,amau(,hitwerefoundin agullyonlytwelvemet「eS 1.92 Shun-lobi UENo belowthesummitofMt.Shirakami-dake, thesecondhighestpointoftheShirakamis, lyingnear thewesternendofthemountainrange,togetherwithanewoculatespecies of T1'e(、hiama. The distance from Mt. Iwaki-san to Mt. Shirakami-dake is about 29kminasouthwestwarddirection. Like 0.(・ace・us,itdwellsunderstonesembedded inmoist clayey ground inthesubalpinezone. Judging from the fact that the two localitiesareclosetoeachotherbothgeographicallyand topographically, itseems possiblethat 0.caecus,whichisconfinedtothealpinezoneofaveryrecentvolcano, isderived fromtheancestor of 0.yamauc1111,aninhabitantofanold,non-volcanic mountain. Kurasawatrechusnis1ltikawaiS. UENo,sp n ov (Figs 3-5) Length:3.90-4.20mm(fromapicalmarginofclypeustoapicesofelytra). Averyremarkablespeciesofuncertainaffinitydistinguishedatfirstsight fromall the other congeners hitherto described from Japan by combination of glabrous a dorsum of head, extremely short pubescenceon pronotum and elytra, externally grooved protibiae whose anterior facesare almost glabrous, and strongly arcuate aedeaguswhoseapicallobeisdistinctlyreflexedandpointedattheextremityinlateral view. Bodyshort andbroad,moreor lesscoveredwithpubescenceexcept onhead; anophthalmic andapterous. Colour reddishbrown todark reddishbrown,shiny, hardlyiridescentevenonelytra;palpi,antennae,ventralsurfaceandlegsmoreorless lighter thandorsum,usuallydarkyellowishbrown. Headsubquadrate,wider than long,anddepressedabove,withthesidesmod- erately convex; frontal furrowsentire,distinctly impressedthroughout, rather feebly arcuatein front,notangulateatmiddle,andcurvedround behind towards neck con- striction;fronsandsupraorbitalareasgentlyconvex,thelatterwithtwopairofsupra- orbital setaeonlinesslightlyconvergentposteriad, theanteriorpair of them arising fromdistinct foveoles;genaemoderatelyandevenlyconvex,coveredwithshortpubes- cence;neckverywide,withtheanteriorconstrictiondistinctat thesidesthoughnot deep;labrumdeeplyemarginateat theapex;mandiblesstout thoughsharplyhooked at theapices;mentumwidelyconcave,withthetoothinapicalemargination rather narrow,eithersimpleorslightlytruncatedatthetip;palpishortandfairlystout,with subconica1apicalsegmentsanddistallydilatedpenultimateones;antennaeshortbut notsostout,subfiliform,reachingbasal fourthofelytrain ,slightlylongerthanthat in ,segment2about three-fourthsaslongassegment3,segments4and5subequal inlengthtoeachotherandslightlyshorterthansegment3,segments6-10stillshorter andsubequalinlengthtooneanother,eachmorethantwiceaslongaswide,terminal segment thelongestthoughslightlynarrower thanscape. Pronotumtransversesubcordate,widestatabout two-thirdsfrombase,andaljt- tlemoregradually narrowed towardsapexthantowardsbase, with thesidesrather NewEndogeanTrechinesfromNortheastJapan 183 Fig.5. Kurasawatl,ech1lsnt1.・hlkc1、l- S.UENo,sp nov.,c),fromTowada-yamainOhwani-machi widelyreflexedthroughoutandvestigiallyciliated;PW/HW1.36-1.45(M1.39),pW/pL 1.14-1.21 (M1.19), PW/PA 1.36-1.41 (M I 39), PW/PB 1.34-1.43 (M I 39); sides ratherstronglyandalmostevenlyarcuatein front, deeplysinuateat alevel between basalsixthand fifth, and theneithersubparalle1or slightly divergent towards hind angles,whichareeither rectangular orsomewhat obtuse,withtwopair ofmarginal setae, theposterioroneof whichisslightlyremoved forwards;apexaboutaswideas base, PB/PA 0.98-1.01 (MO99), slightly bisinuate, with front anglesproduced for- wardsthoughobtuse;baseeitherslightlybisinuateorstraightatmiddle,usuallysome- what obliqueoneachsideinsidehindangle;surfaceratherstronglyconvex,sparsely 184 Shun-lobi UENo coveredwithveryshortpubescence;medianlineclearlyimpressed,deepenedposterior- ly; apical transverse impression obsolete though the apical area is longitudinally v、rinkled;basal transverseimpressionbroadandcontinuousthoughnotsharplyde- lined, laterallymergingintolargebasalfoveae,whicharedeepandsomewhat uneven at thebottom;postangular carinaevery obtuse; basal arealongitudinallystrigose. Scutellum visible though largely concealed by the basal partof pronotum. Elytrasubovate,muchwider thanprothorax, widestataboutthree-seventhsfrom bases, andmoregradually narrowed towards apices than towards bases; EW/PW 1.54-1.59 (M I 56), EL/EW145-1.55(MI49);shoulderseffaced, withprehumera1 bordersobliqueand feeblyarcuate;sidesratherwidelyreflexedandmicroscopically ciliated,gentlyarcuatefrombasestothemiddle,morefeeblysobehind,andalmost conjointly rounded at apices, without appreciable preapica1emargination;surface moderatelyconvex,especiallyatthesides,withfairlysteepapicaldeclivity;striaeentire, lightlycrenulate,clearly impressedon thedisc but becomingshallower at theside, stria8deepenedinapical two-fifths;scutellarstrioleshortbutdistinct;apicalstriole deep,moderatelycurved,andusuallymergingintostria7,sometimesfreeat thean- teriorendanddirectedtostria5;intervalsslightlyconvexonthedisc,flatattheside, eachbearinganirregularrowofveryshortpubescence;apical carinadistinct though obtuse;stria3with twosetiferousdorsalporesat I/8-1/7and 3/8-1/2 from base, respectively;preapicalporesituatedattheapicalanastomosisofstriae2and3nearthe leveloftheterminusofapicalstricto,moredistant fromapexthanfromsuture,and nearer to apical stricto than tosuture; marginal umbilicateporesaggregated and regular. Microsculpturedistinct throughout,mostlyconsistingof polygonal meshes on head,irregulartransversemeshesonpronotum,andfinetransverselinesonelytra. Ventralsurfacesparselypubescentexceptatthesides;analsterniteprovidedwith apairofmarginalsetaein ,withtwopairofthemin Legsshortbutrather thin; . protibiaeslightlyarcuateinapicalpartsanddilatedtowardsapjces,eachwithadeep longitudinalgrooveon theexternal faceandalmost glabrouson theanterior face, thoughafewvestigialhairsaresometimesobservedunderhighmagnification; tarsi fairlystout,segment1aboutaslongassegments2-3togetherinmesotarsus,longer thanthatinmetatarsus; in ,twoproximalsegmentsofeachprotarsuswidelydilated, stoutlyproducedinwardsat apices,and furnishedbeneathwithsexualadhesjveap- pendages. Malegenitalorganverysmallandlightlysclerotized. Aedeagusonlytwo-ninths aslongaselytra, tubular, highestbehindmiddle, and stronglyarcuate frombase to nearapex,especiallyinbasalhalf, withthedorsalmarginsemicircularlyroundedin Profile; basal partsmall,withsmallbasalorificewhosesidesarehardlyemarginate; sa9itta1aileronlargeandprominent;vieweddorsally,apical lobenearlyparallel_sided androundedat theapex;viewedlaterally,apicallobenarrowlyproduced, gentlybut distinctlyreflexed,andpointedattheextremity;ventralmargindeeplyemarginatejn basalbaffinprofile,butonlyslightlysobehindmiddle. Innersacarmedwjthalarge NewEndogeanTrechinesfromNortheastJapan 185 spatulatecopulatorypiecealmosttwo-fifthsaslongasaedeagus,itsapexbeingpointed indorsal view. Styleslargeandbroad,leftstyleobviouslylarger thantheright,each bearing four longsetaeattheapex. T、peso/,tes. Holotype: , allotype: , paratypes: 1 3 25-IX-1992, Y. , , NlsHIKAwAleg. AlldepositedinthecollectionoftheDepartmentofZoology,Nation- alScienceMuseum(Nat.Hist),Tokyo. Type loo・a/Itv. Towada-yama,220m inaltitudeat theNW foot inthe Mitsu- menai-gawaValley, inOhwani-machi ofAomoriPrefecture, on thewesternsideof northeastern Honshu, NortheastJapan. Notes. ItwasmostunexpectedthataKurasawatrechusdidoccur ontheShira- kami Mountainsat thewesternsideof northeastern Honshu, orwithin thedistribu- tional rangeof Oroblemus. The northernmost records of Kurasawatrechus hitherto publishedarefromthecentralAbukumas(K.・enba1S.UENo,1990)andthenorthern Yamizos(K yam17onlsS.UENo,1988). Theybelongtothetypicalspecies-groupsof thegenusandareradicallydifferent fromthepresentspecies. Inmany respects, K nlshlkaH,alseemsclosertoKoreanspecies(cf.UENo&NAMKuNG,1968)thantoCentral Japanese,especiallyinviewoftheexternallygroovedprotibiaeandthereflexedapical lobeofaedeagus, althoughnoneof thedescribedspeciesfrom Korean caves see m directlyrelated tolt. SeveralundescribedspeciesofKu1asaH'afte'chusinabroadsense havebeencollectedinnortheasternHonshu,mostlyfromtheKitakami Mountainsat theeasternsjdeandpartlyfromtheeuMountainsatthecentralpart. Theymayhave certain relationship with K nlshlkawai, ascanbeexpectedfromgeographicalProx- imity. Inanycase,genericorsubgenericclassificationofKurasawatrechus(S lat) shouldberevjsedwhentheseundescribedspeciesareproperlyintroducedintoscience. ThetypelocalityofKntshlka、?,alissituatedneartheeasternendoftheShirakami Mountains,about41kmeastbysouthofMt.Shirakami-dake,about27kmsoutheast of Mt. Iwaki_san, andmore than 370km north of that of K. zenba1. It lies in the Mjtsumenai-gawaValleyandat thenorthwestern foot of Towada-yama(664min height). Thetypespecimensof thetrechinebeetleweredu9out fromaColluvium depositedat therightsideof theMitsumenai-gawaRiverat anelevationof220m, togetherwithanewoculatespeciesofTre(,/llamatobedescribed inaforthcomin9 Itmayberegardedasanupperhypogeaninhabitant, but themodeof its paper. occurrencesuggeststhatthespeciesisactuallyendogeanratherthanupperhypogean. Thjscanbesurmjsedalsofromitsshort-leggedfacies,whicharetypicallyendogean. 要 約 上野l?-: 白;fill山地に産する地中性チビコミムシfitの2新極. - 青森県と秋田県との県境に位置 する白中f山地からは, 盲目のチビゴミムシ類がこれまで知られていなかった. 1二'I年になって, 山脈東 1-, , l 部の麝 和- l、l Lと 西部の白神1l1か ら 西 川自.期1 山 内 、'''の11,,j民により, それぞれ新種と判定される地 中性のメクラチビコ、ミムシ類が発見されたので, これらに71-オリ= クラチビコ ミ ム シ Ku「aSaWa- Sa f1,ec7/11s,11s1/1 ｽal ^ j . UE およびシラカミメクラチビゴミムシ 0'0/'/e'mlSya'naM(/7ffS・UEN0 とぃ 186 Shun-Ichi UENo う新名を与えて記載した. 後者は, 隣接する岩木山に固有のイワキメクラチビコミムシ 0.caectlsに 近縁であるが, 前者は日本からこれまでに記載された同属のどの種とも系統が異なり, むしろ朝鮮半 島産の種群に似ている点が多い. References UENo,S.-I.,1983. ThearchaictrechinebeetlesofthegenusOroble,nus. Meinnatn.ScI.Mus,Tokyo, (16):155-171. - - 1985. Carabidae(Nebriinae,Elaphrinae,Loricerinae,Scaritinae,Broscinae,Trechinae). In UENo,S.-I.,Y.KUROSAWA&M.SATo(eds),TheCo/eopteraofJapaninColor,2:54-88 [incl.pls. 11-16]. Hoikusha, Osaka. (「nJapanese) 1988. The Kurasawatrechus(Coleoptera, Trechinae)of theYamizo Range,CentralJapan. - - Elytra, Tokyo,16:107-116. - - 1990. OccurrenceofanewKurasawatrec/1us(Coleoptera,Trechinae)at thecentralpart of theAbukumaHills,EastJapan. Ibid:.,18:175-178. - - &J. NAMKuNG,1968. Somecave-dwellingtrechids(Coleoptera)fromSouth Korea. Bull. natn.ScI. Mus.,Tokyo,11:245-262. &A. YOSHIDA, 1966. Apresumptiveprototypeof the Trec1/oblemuscomplex (Coleoptera, - - Trechinae). Ibid1.,9:75-83.