Occurrence of a Trechoblemus (Coleoptera, Trechinae) in Sakhalin

5 Pages·1994·5.2 MB·English

by  Ueno, S -I

Elytra,Tokyo,22(2):215-219,Nov.15,1994
OccurrenceofaTrec/1ob/emus(Coleoptera, Trechinae)
in Sakhalin')
Shun-lobi UEN0
DepartmentofZoology,NationalScienceMuseum(Nat.Hist),
3-23-1Hyakunin-cho,Shinjuku,Tokyo,169Japan
and
German Sh. LAFER
LaboratoryofEntomology,InstituteofBiologyandPedology,
FarEastBranch,RussianAcademyofSciences,
VIadivostok-22,690022Russia
Abstract AtrechinebeetlebelongingtothegenusT1・ec・/lob/otitisisrecordedfor
thefirsttimefromsouthernSakhalin. It is tentatively identified with T.post1/enat11s
(H.W.BATES),thoughdif、ieringfromspecimensofCentralandWestJapaninthecom-
pletely ateyes.
Recently,atrechinespecimenbelongingtothegenusT1'e・(hoble'mlswasfoundout
jn thecollectionofthe InstituteofBiologyand Pedology, Vladivostok. It waskept
jnalotofold Japanesematerial received fromSakhalin, andbearsalabel inscribed
''saghalienCentralExpt.Sta./193225/XI/collectedinhibernation ' It is therefore
apparentthatthespecimenwastakenatKonuma(nowNovoaleksandrovsk) insouth-
ern sakhalin, wheretheSaghalien Central ExperimentStation [for agriculture and
forestry]waslocatedintheprewar time.
Afteracarefulexamination,ithasbecomeclearthatthespecimenisalmostiden-
tjca1wjth thoseof T1・ec・/1oblemuspostl/e1'attls (H.W. BATES) from Cent「al and West
Japanbut differs fromthemin thecompletely flat eyes. It is true that thesize and
convexityofeyesarerather variableinJapanesespecimensofT.postilenatus. They
arerather flatespeciallyinthespecimensfrom Hokkaidoadjacent toSakhalin, but
notsocompletelyflatasintheSakhalinspecimenunderconsideration. On theother
hand,specificdifferencesareusuallysubtlein the trechinebeetlesbelongingto the
genus T1,echoblemus. Although thesix species of thegenus hithertodescribed are
classjfjedintotwospecies-groups,thatofT.'nl'(1''osandthatof T.post11enattls,onthe
basisof differenceingenitalicconformation, fiveof thesixbelongtothelatter and
onlyoneofthefive,T mi(・:1・op/1t/1almttsS. UENo(I955,p 404,fig. l),can bedefinitely
1)ThisstudyissupportedinparibytheGrant-in-aidNo.066409I4forScientificResearchfromthe
MinistryofEducation,ScienceandCulture,Japan.
216 Shun-lobi UENoandGermanSh. LAFER
recognized as anindependentspecies. The remaining four, T. postilenatus (H.W.
BATES),T. ll',1drothi'SUENsoN(1957,p 93,pl 2,upperleft), T.valentineiSUENsoN(1957,
94,pl 2,upperright),andT.、、,est、(ottl'BARR(l971,p. l42,figs.1-2),areveryclosely
p
relatedandsometimesdifficulttodistinguishonefromanother. For instance, thetwo
Chinesespecies(thesecondandthird)canbereadilydistinguished fromeachother,
but thedifferenceisbridged tosomeextent by theJapanesespecies, T.post1/enatus.
Theseniorauthorhasre-examinedtheirtypematerialandmadeadetailedcomparative
studyoftheir malegenitalia, whicharecloselysimilar tooneanother. Under these
circumstances, thepresent authorsprefer toregard theSakhalinspecimenasanex-
treme local form of T.postl/e,7atus, leavingthefinal determinationofitssystematic
statusuntil a longer series of specimensareobtained from thevicinities of Novo-
aleksandrovsk.
However,asamemberofthegenusT1,・ee/1ob/e,mlsisfoundforthefirst time from
theRussian Far East, afulldescriptionoftheSakhalinspecimenwillbegiven in the
present paper for facilitating futurestudies. The abbreviations used herein are the
sameasthoseexplainedinthepreviouspaper oftheauthors' (UENo & LAFER,1994,
pp. ll2-ll3).
TheauthorsaredeeplyindebtedtoMr.SumacKAsAHARAfor takingthetrouble
toinkthesketchesprepared by LAFER.
Trechoblemuspostil,enatus(H.W.BATES,1873)
(Figs.1-3)
T・liechuspost11e,latusH.W.BATES,1873,Transent.Soc.London,1873,p295;typelocality:Osaka.
T・,echoblemuspostile,1atlls: JEANNEL, 1922, Annis,Soc.ent.Fr., 90 [for i921], pp 297, 298; 1928
Abei11e,Paris,35,pp.101,105. - UENo,1970,Bull natn.Sci.Mus.,Tokyo,13,p 604, fig.1
1985,Coleopt.JapanCol.,Osaka,2,p 85,pi t6,fig 6.
Other referencesareomitted.
Length:4.05mm(fromapicalmarginofclypeustoapicesofelytra).
Colourconcolorouslyyellowishbrown,notinfuscatedevenonhead:elytrasemi-
transparent, showinghind wingsby transparency. Headmat, pronotum andelytra
moderatelyshiny,withfeeblesilkylustre.
Bodyelongate, parallel-sidedanddepressed, denselycoveredwith suberect pu-
bescenceexceptforheadandprosternum,ofwhichtheformersparselybearsshortpu-
bescenceandthelatterbearsafewhairsinthemiddle; legswhollypubescent. Micro-
sculptureisodiametricandcoarseon head, transversely reticulated for themost part
ofpronotum,andofobscuretransverselinesonelytra,eIytraIintervalsfinelypunctate,
eachpuncturebearingahair. Measurements(inmm)as follows: HW0.83, HL0.58,
PW1.10,PLC.90,PL,0.93,PA0.83,PB0.83,EW145,EL2.55.
Headshortandbroad,withcompletelyflateyes,whoseoutlineformsacontinuous
curvewith that of genae, the latteraboutseven-eighthsas longaseyesandcovered
withsuberecthairs;viewedlaterally,eyesvertical,withroundedanteriorandstraight
Tfi・ec/1(/)/elt1llsfromSakhatin 217
Fig.1. Habitusof T/・ec・/lob/eln1lspo.llile,1(It".l (H.W.BATES), fromNovoaleksandrovskinsouth-
ernSakhalin. (Scale:1.0mm.)
posterior margins; frontal furrows distinct throughout. subangulate at middle and
widelydivergent in front andbehind; frons feeblyconvex, separated from vertex by
amat-defined transverseimpression,supraorbital areasgentlyconvex: labrumtrans-
verse,deeplyemarginateatapex;mandiblesshortandstout;antennaestout filiform,
reachingbasal three-seventhsofelytra, withthelengths (inmm)ofsegments1-11as
follows:0.28,0.18,0.30,0.23,0.28,0.25,0.23,0.23,0.23,0.23, 0.33:antennalsegments
7-10eachcylindricalandmorethantwiceaslongaswide.
Pronotum transverse subcordate, widest at about three-fourths from base, and
muchmore gradually narrowed towardsante-basal constriction than towardsapex;
PW/HW133,PW/PL122,PW/PL,1.18,PW/PAt.33,PW/PB1.33;sidesmoderately
arcuatein front, feeblysobehind thewidest part, shallowlybut distinctly sinuateat
about basal two-ninths, andthensubpara11eI towardsrectangular hindangles, with
marginalgutters fairlywidethroughout; twopairofmarginal setaepresent, thean-
terioroneat thewidest part and theposterior onhindangles: apexaswideasbase,
PB/PA1.00, lightly bisinuate. with front angles prominent and narrowly rounded;
basealmost straight: discgently convex, covered with fine hair-bearing punctures;
218 Shun-lobi U_iNoand GermanSh. LAFER
Figs.2-3. MalegenitalIaofTfi'e('/1oble'ntlspost1/etlattls(H.W.BATES),fromNovoaleksandrovsk.
- 2.Rightlateralviewofaedeagus,withseparatedleftstyle. - 3.Leftlateral vjewof
aedeagus. (Scale: 0.5mm)
median line distinct, widening in basal area; apical transverse impression obsolete,
basal onedistinct, continuous, longitudinally foveolate oneachsideofmedian line
and laterallymerginginto roundbasal foveae, whicharelargeanddeep; nopost_
angularcarinae.
Elytraelongatedovate,widestataboutfive-ninthsfrombasethoughalmostpara1_
lei-sided, withsquareshouldersand almost transverseprehumeral borders: EW/pw
1.32,EL/PL,2.74,EL/EW176;sidesnarrowlybordered throughout,nearlystraight
frombehindshoulderstonearthemiddle,thenfeeblyarcuate, andalmostconjointly
roundedatapices; dorsummoderatelyconvexat thelateral parts, gentlysoonthe
disc,withgentleapical declivity: striaesuperficial thoughalmostentire,deeplyim_
pressedinapicalarea,stria8deepenedbehindthemiddleset ofmarginal umbilicate
pores:scutellarstrioleshort'apicalstrioleshortbutdeep,stronglycurvedandjoining
stria3;intervalsflat,apicalcarinaprominent;stria3withtwosetiferousdorsalpores
atabout2/9and4/7frombase, respectively; preapicalporesituatedwell behindthe
leveloftheterminusofapicalstriole, andalmostequallydistant fromapexandfrom
suture.
Ventralsurfacesmooth; venterof prothoraxstronglyconvex. Legs fairlylong.
MalegenitaliaasintheJapanesespecimensofthespecies.
Spe(1'nle1l examined. l Konuma (=Novoaleksandrovsk), southernSakhalin,
,
25-XI-l932,Japanesecollector (IBPV).
T1・e(・/1oblen1lls fromSakha1in 219
Notes. It isworthnotingthat inthesubfamilyTrechinae, andinmost beetles,
reductionofhindwingsusuallyprecedes that ofeyes. Thesituationis reversein the
Sakhalinspecimen, inwhichthehindwingsarenormally developed in spiteof the
completeflatteningoftheeyes.
InmanyJapanesespecimensofT.postile'latus,theheadistransverselyinfuscated
acrosstheeyesandtheelytrahaveapairofmat-defineddarkblotches. This js,how_
ever,notdefinite;certainspecimensareconco1orouslyyellowishbrownasisthecase
oftheSakhalinspecimen. Incidentally,UENohasseentheholotypeofTrechuspost1_'
/enatuspreservedintheNaturalHistoryMuseum,London. Itisafemale(4.60mm
inthelengthofbody)takenbyGeorgeLEWISatOsakain1871,with the fo11owjng
standardratiosofbodyparts:PW/HW1.19,PW/PL126,PW/PA t.35,pw/pB132,
PB/PA1.02, EW/PW136, EL/EW178. Thesedataclearly show that thehead is
narrower,that is, theeyesarelessconvex,intheSakhalinspecimenthaninthewest
Japaneseone.
要 約
上野俊一' G・ Sh. LAFER: サハリンのアトスジチビゴミムシ. 一 ウラデイゥ゛ォストクのロシア
科学院生物学_:◆i11、学研究所に保管されていた古い標木のなかに, サハリン産のアトスジチビコ、ミムシ
が1点みつかった. この標木は,戦争までの小沼にあった準i 太庁中央試験所に所蔵されていたもので,
越冬中を採集されたと付記されている.日本のァ1、スジチビゴミムシとほぼ完全に一致するが,複限
のまったく膨隆していない点が異なっているので, 仮に同一種のTrechoblemuspostilenatus(H.w.
., BATES) と認定し, 念のために記1,1をｶつけておいた い ずれにしても こ の属のチビゴミ (cid:0)(cid:18245)(cid:18175),
ハリンから初めての記録になる.
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