The Trechine Beetles (Coleoptera, Trechinae) from the Zhongdian Area in Northwestern Yunnan Mainly Collected by Ales SMETANA

8 Pages·1998·8 MB·English

by  Ueno, S-I

Ely1,-a,「okyo,26(1):61-68,Mayl5,l998
TheTrechineBeetles(Coleoptera,Trechinae) fromthe
ZhongdianAreainNorthwesternYunnan
MainlyCollectedbyAlesSMETANA
Shun-lobiUENo
DepartmentofZoology,NationalScienceMuseum(Nat.Hist)
3-23-1Hyakunin-cho,Shinjuku,Tokyo,169-0073Japan
Abstract ThetrechinebeetlesmainlycollectedbyAlesSMETANAintheZhong-
dianareainnorthwesternYunnan,SouthwestChina,areenumerated.0fthethreespecies
involved,onenewspeciesofthegenusQueinnect,-e◆(,11usisdescribedunderthenameofQ
g1obipentlis,Bllutanot,・echtlsfa,・kaciDEuvEistransferredtothegenusAgonotrechusand
redescribed,andtheremainingoneisidentifiedwithTli-ec11us″lao''opsJEANNEL.Inaddition
tothese, 「,・colitissfe加anfco/aDEuvEand 加'ranorrec加ssic加'anico/ave1'「''oslo''DEuVE
arealsotransferredtoAgonott-echus,andthelatterisregardedasafullspecies.
Through the courtesy of Dr. Ales SMETANA of the Agricultureand Agrifood
canada, Ihadanopportunitytoexaminearichcollectionofthecarabidsubfamily
Trechinaemade by him in northwestern Yunnan and western Sichuan, Southwest
Chjna.Acloser inspectionof thiscollectionhas revealed that itcontainsmanyde-
scribedandsomeundescribedspecies.Sinceour knowledgeofChinesetrechinesis
notyetsatisfactory,andsincetaxonomicrevisionseemsneeded forcertainspecies
previouslydescribed, Iwouldliketotakethisgoldenopportunity formakingsomere-
visionson thebasisofamplematerial. Inthefirstplace, Iamgoingto takeup the
trechinescollectedintheZhongdianareainnorthwesternYunnan.
Theabbreviationsusedinthispaperarethesameasthoseexplainedinprevious
papersofmine.ThestandardratiosofAgonot,-ec11usfat,kaciarecalculatedonthebasis
of24specimens(12 d 12 )randomlypickedup,includingapairoftheparatypes.
ThespecimensexaminedarepreservedinthecollectionsofDr.SMETANA(Ottawa),the
Museed'HistoireNaturelle,Geneve,andtheNationalScienceMuseum(Nat.Hist),
Tokyo
Beforegoing further, IwishtoexpressmyheartfeltthankstoDr.AlesSMETANA
forhjskindnessinsubmitting tome for taxonomicstudyallhiscollectionof the
TrechinaemadeinChina.HeartythanksarealsoduetoDr.JanFAR and Mr. Artur
GITzEN for theirkindhelpinexamininginvaluablespecimensincludingtheparatypes
ofBhutanotrechusfarkaciforcomparativestudy.
62 Shun-lobiUli、o
AgonotreclMsf‘arkaci(DEUvE,1995),comb nov.
B1;utanot,-ecjlusfa,kacjDEuvE,1995,Revuefr.Ent.,(N.S.),17,p.10,figs.6,12;typelocality:menta9neS
al5kmal'ouestdoZhongdian[=Mt.XueShan].
Length:4.35-5.30mm(fromapicalmarginofclypeustoapicesofelyt「a).
ThedjagnostjccharactersofthisspecieswasgivenbyDEuvEaccompaniedWith
fjnej11ustrationsofitshabitus(fig.12)andmalegenitalia(fig6),thoughhisdesc「iP-
tjon is not correct in saying “Iapresencedo4 soles seulement a l'extremite deS
parameres”Inthefollowinglines,Iwillgivearedescriptionofthespecies.
closelyalliedtoA.vent,-osior(DEUvE,1995,p it)(newcombinationandStatus;
seeNotes),buttheprothoraxismoretransverseonanaverageandmoreCont「acted
bothalapexandatbase,theelytraareshorterwithsomewhatnarrowerbasalPa「t,and
theaedeagusisdifferentlyshaped.
colourbrowntoblackishbrown,headblackexcept forclypea1andvertexa1pa「tS,
elytramoreorlessinfuscateexceptalongmargins, faintlyiridescentandsometimes
wjth fajnt greenish tinge; propleura and epipleurausually brownish; buccal ap-
pendages,antennaeandlegslightbrown.Apterous; forebodyrelativelylargeinp「o-
portiontohindbody;microsculpturefine,mostlyconsistingoftransversemesheson
headandoftransverselinesonpronotumandelytra,thoughlargelyobliteratedonely-
tra.
Head fairlylarge, transverse,depressedabove,with frontal furrowsdeeply im-
pressed andonly feebly arcuate on dorsumbut becoming much shallower behind
supraorbitalareas,notangulatebutoftenobliquelyrugoseinwardsatabout thepost-
eyelevel;eyessmallandflat,usuallyaslongasgenaebutsometimesfive-sixthsas
longasthelatter;genaemoreorlessconvexthoughindividuallyvariableinconvexity;
neckconstrictiondistinct at thesides; labrumonlyslightlyemarginateatapex;anten-
naestout,reachingbasal thirdofelytra,withmiddlesegmentseachslightlylessthan
twiceaslongaswide,segment2theshortest,terminalsegmentthelongest.
pronotumtransversesubcordate,distinctlywiderthanhead,widestatalevelbe-
tween four-seventhsandthree-fifths frombase;PW/HW144-1.58(M I51),PW/PL
1.44_1.59(M I52),PW/PA t59-1.71(M.166),PW/PB121-1.31(M I27);sides
widelyreflexedexceptnear frontangles,stronglyandwidelyarcuatein front,lessso
behindmiddle,andbrieflysinuatejustbeforehindangles,whicharedenticulateand
moreorlessproducedlaterad;basewiderthanapex,PB/PAt25-1.39(M I30),very
slightly bisinuate; dorsum gently convex, basal transverse impression mat-define
basal foveaefairlylarge,outwardlyarcuateatthebottom.
Elytrashortovate,widestataboutoralittlebeforethemiddle,andalittlemore
graduallynarrowedtowardsbasesthantowardsapices;basalareasrelativelynarrow;
Ew/pW153-1.67(MI61),EL/PL2.98-3.26(M3.ll),EL/EW123-1.32(M I27);
shouldersindistinct;sidesratherwidelyreflexedthroughout, feeblybutregularlyarcu-
ateinproximalhalvesexcept formoderatelyarcuateprehumera1parts,moderatelyso
behind, and widely and almost conjointly roundedat apices, eachwithashallow
TrechineBeetlesfromtheZhongdianAreainYunnan 63
preapica1emargination;dorsummoderately convex,withrathersteepapicaldeclivity;
striaesuperficial,finelypunctate,becomingshalloweratthesidethoughalmostentire;
scutellarstrioledistinct;apicalstrioleshortbutdeeply impressed,gentlycurvedand
freeat theanteriorend, usuallydirected tostria5but sometimesdirected tostria7;
stria3withtwosetiferousdorsalporesat1/8-1/7and2/5-4/9 frombase,respectively;
preapicalporelyingnear theleveloftheterminusofapicalstriole,usuallyadjoining
stria2butsometimeslyingontheapicalanastomosisofstriae2and3;marginalum-
bilicateporesregular.
Legs short and fairly stout, of ordinary conformation for amember of Ago-
notrechus.
Malegenitalorgansmall thoughratherheavilysclerotized,similaringeneralcon-
figuration tothatofA.verltrosiorbut theaedeagus is lessarcuateatmiddleandhas
broaderapical lobe.Aedeagusabout three-tenthsas longaselytra,slender,andonly
feebly arcuateatmiddle,withbasal partmoderately curved ventradandbearinga
fairly largesagittal aileron;vieweddorsally,apicalpartgradually narrowed towards
apical lobewhoseapex isratherwidelyrounded;viewedlaterally,apical lobe fairly
wide,slightlycurvedventrad,andratherwidelyroundedat theextremity.Copulatory
pieceaboutone-fourthaslongasaedeagus,spatulate,andgraduallyacuminate.Styles
with fairlybroadapicalparts,eachbearing four tosix(usuallyfive)setaeofunequal
lengthattheapex.
Specimens examined. 2(3(3, 1 (paratypes), “N YUNNAN 23. VI. l994/
27.49N99.34E4200-4700m/mts. 15kmWof ZHONGDIAN/1gt.J. Farkac& D.
Kral; 66(3(3, 62 “CHINANYunnan, Xue/Shannr. Zhongdian/3900m 25 VI.
, .
1996/27°49N99°34EC41//collectedby/A.Smetana”; 23 d, 14 ,same locality
andcollector, but “4050m24. VI. 1996/27°49N99°34EC40”; 1d, 2 ,samedata
but“C39”;6 d,4 ,samedatabut“C38”;25 d,13 ,samelocalityandcollector,
but“4000-4100m23. VI 96/27°49N 99°34EC36”.
Notes. Thisspecieswasoriginallyplacedunder thegenusBhutanotrechusto-
getherwithsichuanlcolaventt-osio,.Thesamearrangementwasalreadysuggestedby
theFrenchauthor(DEUvE,1992b,p. l74),whostatedthat“Tsichuanicolapoutplus
precisementetrerapprochedugenreBhutanot・,echusUENo”However,thisopinioncan
bedisputed forseveralreasons.
Ihaveseenall thedescribedspeciesofAgonotrechus(s lat),whichincludefour
topotypicalspecimensofTrec11ussic11uanicolaDEuvE(1989,p 317, figs 3, 6) col-
lectedbymyselfandsixtopotypicalspecimensofBhutanotrechusslchuanlcolaven-
t,-osior identifiedbyDEuvEhimself,andIamconfident thatthesetaxaandBhutano-
trechusfarkaclaredecisivelydifferentinevolutionarytrend fromBhutanott-echusre-
fexlco11isS.UENo(1977,p. l92, figs 9-11).Thelatterisalargelong-leggedspecies
ofelongatebody form,inwhichtheprothoraxisbarrel-shape(i,theprehumeralborder
ofelytraisobliteratedat theinternalend,andtheelytral striaeareobliteratedalto-
gether. 0nthecontrary, themembersofAgonotrechusarealwaysshort-leggedand
moreor lessshort-bodied,withtheprothoraxwidestdistinctlybeforethemiddleand
64 Shun-lobiUE、・o
withtheelytraeitherentirelyoralmostentirelystriatedandcompletelyborderedatthe
prehumera1parts.ThethreetaxadescribedbyDEuvEperfectlyfallinthiscategoryand
sharenoneofthediagnosticfeaturesofBhutanott-echus. ltistruethattheseapterous
speciesaresomewhatdifferent fromfully winged,ordinaryspeciesofAgonotr-echus
andmaybediscriminatedinaspecies-groupof theirown,but themembersofthis
primitivegenus isusually rathervariableinmorphological features,aboveall inthe
numberofelytra1dorsalpores,conditionofhindwings,andthenumberofparamera1
setae.Thevariationoftenappearsindividually,notonlyinter-specifically.
DEuvE(1995,p it)consideredthathisfat・kaci isdifferent fromslchuanlcola in
thenumberofparamera1setae,four intheformerandseveninthelatter.However,this
character iso量onunstableinsuchprimitivegeneraas n-echiama andAgot1otrechus,
andin thethreetaxaconcerned,thenumber varies from fivetoseveninsl(/nlanicola,
fromfourtofive(probablymore)invent,-os1or,andfromfourtosixinfat・kacl.0nthe
otherhand,vent,・oslo,seemsspecificallydifferent fromsichtianlcola.It isintermediate
inbothexternalandgenitalic featuresbetweenslchtlanlcolaandfa,kaci,andmaybe
evenclosertothelatter.Fromslchlla,licola,itisdistinguishedbythefollowingdetails:
Colourdarker,whollyblackish,sometimesalittlebrownishat theposteriorpart
ofheadandantero-latera1partsofpronotumbutneveronelytra, whichare faintly iri-
descent;ventralsurfaceblack; femorausually infuscate.Forebodysmallerinpropor-
tiontolargehindbody. Headwitheyessomewhat larger onanaverageandusually
moreconvex,usuallyaslongasgenaebutsometimes12timesas longasthelatter.
Prothorax less transverse,PW/HW 140-1.46 (M I44) [1.50-1.53 (M I 51) inA.
sIchuanlcola],PW/Pi t37-1.45 (M I42) [1.47-1.53 (M I49) inA.slchuanlcola],
widestatalevelalittlenearertothemiddle,lesscontractedatapexandusuallynar-
roweratbase,PW/PA t56-1.62 (M I59) [1.62-1.69(M I65) inA.sic;1uanlcola],
PW/PB131-1.41(MI35)[1.25-1.32(MI29)inA.sichuanicola],PB/PA1.15-1.21
(M1.18) [1.23-1.33(M I28) inA.slchuanlcola],withthesideslesswidelyreflexed,
lessstronglybutmoreevenlyarcuate,andmoredeeplysinuatejustbeforehindangles,
whicharemoreprotrudentpostero-1aterad.Elytralarger,shortandbroad,widest at
aboutmiddle;EW/PW162-1.73(M I67) [1.48-1.54(M I51) inA.sichuanlcola],
EL/PL3.06-3.19(M3.l3)[2.97-3.15(M3.06)inA.slchtianicola],EL/EW130-1.36
(M I32) [1.34-1.37(M I36)inA.slchtlanicola];sidesmoreregularlyarcuate from
shoulderstoapices,whicharealittlemoreprominent;striaeshallower especiallyat
thesideandmorefinelypunctate,thoughalmostentirewiththeexceptionoftheante-
riorhalfofstria8,whichisalmostalwaysevanescent.Aedeagusabouttwo-seventhsas
longaselytra,lessstronglycurvedventradthaninA.sichuanlcola;viewedlaterally,
apical lobebroaderandnarrowlyroundedattheextremity[distinctlymoreacuminate
towardsbluntextremityinA.sichuanlcola];vieweddorsally,apicallobegraduallynar-
rowedtowardsnarrowlyroundedapex[abruptlynarrowedattheleve1ofapicalorifice
andsubparallel-sided tonear thebluntlyendingextremity inA.sichuanlcola];each
stylebearing fourorfiveapicalsetaeoftensupplementedbyaminutesubapicalacces-
soryseta.
TrechineBeetlesfromtheZhongdianAreainYunnan 65
These differences seem to suffice for recognition of an independent species.
DEuvE described “Ie pronotum plus transverse (It/Lt 1,57)” in vent,-osio1- than in
slchtianlcola,butinthespecimensbeforeme,theprothoraxisconstantlynarrower in
the former than in thelatter.
Thenewtaxonomicchangesproposedinthispaperareasfollows:
Agonott'ec/nisslc/1uanlcola(DEUvE,1989),comb nov.
Agonot''coitusventto'slo''(DEUvE,1995),combetstat nov.
Agonot''colitisfat'kaci(DEUvE,1995),comb nov.
AccordingtoSMETANA,Ago,lot,-e(、11usfca,-kact isabundantinthesubalpine forests
onMt.XueShan.HiscollectingsitesC36,38,39and40lieina''highmontaneconif-
erous forest with intermixedbirches and rhododendrons” and the trechine beetle was
collectedby“s量l ingvariousforestfloordebris,mossandpiecesofrottingwood”The
siteC41isa“mixed broadleaved andconiferous forest(Ables, Betula,Rhododend,-on,
etc.),”andthecollectionwasmadeby“siftingleaflitterandother forest floordebris,
particularlypilesofrottingwoodanddebrisbelowthem”
Quel'l'tectrechusglobipennisS.UENo,spnov.
(Fig.1)
Length:3.40mm(fromapicalmarginofclypeustoapicesofelytra).
Arelativelysmallspecieswithsmall forebodyandlargehemig1obularelytra,rec-
ognizedataglanceon thecharacteristicshapeofhindbody;surfaceglabrousandpol-
ished as in the other congeners; microsculpturecompletely vanished. Colour dark
brown,headblackexcept forclypeus;buccalappendagesexclusiveofmandiblesyel-
lowishbrown;antennaeandtarsibrown.
Headtransversewithwideneck,depressedabove; frontal furrowsdeepespecially
ondorsum,notangulate,andwidelydivergentposteriad; fronsandsupraorbitalareas
moderatelyconvex,thelatterwithtwopairofsupraorbitalsetaeonlinesdivergentpos-
teriorly, theanterior setaeclearly foveolateat thebases; eyessmall and flat, only
slightlylonger thangenae, whichareconvexandaboutseven-ninthsaslongaseyes;
neck constrictiondistinct at thesidesthoughnot verydeep; labrumtransverse,shal-
lowlyemarginateatapex;mandiblesstout,sharplyhookedatapices;palpishortand
stout, with penultimatesegmentswidely dilated towardsapices; antennaealsoshort
andstout,subfiliform,reachingbasalthree-tenthsofelytra,segment2aboutfive-sixths
aslongas3andsubequa1inlengthtoeachof4-10,segments6-10eachovalandalit-
tlemorethant5timesaslongaswide,terminalsegmentthelongest.
Pronotum small, subcordate, wider than hea wider than long, widest at two-
thirds from base, and more strongly narrowed towards base than towards apex;
PW/HW 124, PW/PL 1.15,PW/PA ca. l 36, PW/PB146; sides finelybordered in
apicalthree-fifthsbutimmarginatebehind,stronglyarcuateinfront,lesssobehind,and
deeplysinuateatbasalsixth,probablywithtwopairofmarginalsetaethoughthepos-
teriorpairislackingintheholotype;apexwider thanbase,PB/PAca.093,withfront
66 Shun-lobiUEト◆o
Fig. l. Qtlel,fleet,・ec・htlsg1obipe,1,11sS.U白No,sp nov.、 fromMt.XueShannearZhongdian
,
anglesroundedoff;basegentlyarcuate,brieflyobliqueoneachsidejustinsidehind
angle,which formsadigitiformprocessprotrudentpostero-laterad;discstrongly con-
vex,withclearlyimpressedmedianlinewhichisdilatedinbasalarea;basal transverse
impressionsulciformandcontinuous;basal foveaesmallbutdeep,eachexternallyde-
limitedbycarinateanteriorcontinuationofpostangulardigitiformprocess;basalarea
smooth.
TrechineBeetlesfromtheZhongdianAreainYunnan 67
Elytrashortandbroad,hemig1obularlyconvex,widestslightlybehindthemiddle,
withbasalpartsbrieflyproducedanteriadand formingashortbasalpeduncle;EW/PW
1.99, EL/PL 2.84, EL/EW 124;shouldersveryobtusethoughnotsocompletelyef-
facedasintheothercongeners,withprehumera1bordersmuchlessobliquethoughbe-
coming finer anteriorlyandobsoleteunder thelateral convexityofbasalareas;sides
rather widely reflexed, feebly arcuatebehindshouldersbutstronglyso inposterior
halvesandwidely roundedatapices,which formasmall re-entrantangleatsuture,
eachwithaslightpreapica1emargination;discnarrowly depressedalongsutureand
devoidofappreciablestriation,withtheexceptionofapicalstrictowhichisdeeplyim-
pressedthoughshortandfreeattheanteriorend;apicalcarinaveryshortandveryob-
tuse; threesetiferousdorsal porespresent on thesiteofstria3at about 1/6, 1/3and
4/9-3/5 frombase,respectively;preapica1,apicalandmarginalumbilicateporesasin
theothercongeners.
Legsrelativelyshortandstout;protibiaeas intheothercongenersinconforma-
tion;tarsomere1shorterthantarsomeres2and3togetherinmesotarsus,aboutaslong
asthat inmetatarsus.
Maleunknown.
Type specimen. Holotype: “CHINA NYunnan Xue/Shannr. Zhongdian/
,
3900m 25. VI. 1996/27°49N 99'34E C41//collected by/A. Smetana” To be de-
positedinthecollectionoftheMuseed'HistoireNaturelle,Geneve.
Notes. Atfirstsight,thisnewspecieslookslikeamemberofDeuveot,-ectlusdue
tothehemiglobular hindbody. It is, however,obviousthat thepresent trechineisa
thirdspeciesofQueinnectrec111lsinviewoftheposteriorlyevanescent lateralborders
ofpronotum, theanteriorlydiminishedprehumera1bordersofelytra, theabsenceof
preapica1pore,andaboveall,thedigitiformprocessesformedbythepronota1hindan-
gles.AfterdescribingQ.smetana1(UENo,1995,p 94,figs.1-3), Ihadanopportunity
tovisittheNaturhistorischesMuseumBaseland tocomparebothQ.s,netanaiandthe
presentspecieswiththeholotypeofQ excent,-lc1lsDEuvE(1992a,p 354;1992b,p.
183,figs 22-23). Itwas foundastheresultthatQ.s,;tetanal ismorecloselyrelatedto
thetypespeciesthanQg1obipenntsis,thoughallthethreebelongtothesamelineage.
Toour presentknowledge, thethreespeciesofQuemnect1-ectlusoccuron threedif-
ferentmountainsthatareconsiderablydistant fromoneanother,butotherspeciesof
thesamegenusmustbefoundontheinterveningmountainsifwecanlocategoodnat-
ural foreststhat areindispensable for theexistenceof thesespecializedhumico1ous
trechines.
AswasalreadymentionedintheNotes following theaccount ofAgonotrechus
farkac1,SMETANA'scollectingsiteC41isamixedbroadleavedandconiferousforeston
Mt. Xue Shan. Judging from its habitus, Quelnnect1-echus g1obipennis may be a
saproxy1oph1iousspecies,andprobably livesunder“pilesof rottingwood”or inthe
“debris below them”
68 Shun-lobi UENo
Trechus(s.str.)macropsJEANNEL,1927
「'l・'echus(s.str)mao・,opsJEANNEL, 1927, Abeille,Paris,33 pp.157, 160, figs 533-536; typearea: Yun-
Nan. - UENo&YIN,1993,Elytra,Tokyo,21,p354.
Other referencesareomitted.
Specln,1ense;xlamlned. 8,33 5 , ''CHINA NYunnan/Zhongdianenv. 3200-/
3300m21-22.VI.1996/27'50N99°36EC35//collectedby/A.Smetana,J.Farkac/
andP. Kabatek”
Notes. As inthepreviousrecord fromtheDaliarea(UENo& YIN,1993, loo.
cit), I tentativelyregardmao,,opsasa fullspecies.Sincethen,however,thistrechine
beetle has been collected from several localities in Yunnan andSichuan, andseems
widelydistributed inSouthwest China. A careful comparativestudy baseduponthe
material frommanymorelocalitiesisneededforclarifyingitstruesystematicstatusin
thegroupof1l-echusindicus.
要 約
1:野俊一: SMETANA博_-l:などによって中同 -南省中甸地域で採集されたチビゴミムシ
類. - 中同:z南省北西部の中甸地域, とくに'-'山で, AlesSMETANA博士などによって採集さ
れたチビゴミムシ類は, 3種に分類された. 大多数は, DEuvEによって記般されたBht,fane-
tree/,usfa,kaciだったが, t1富な資料に基づいて検討した結果, 明かにハバビロチビゴミムシ属
Agonot,・coitusのものとlIJ定されたので所属を移した. またこの機会に, Bhutanot,・echus属のもの
と考えられていたstchuan,colaもハバビロチビゴミムシ属に移し, その亜種として記破された
、,ent,・oslo,-を独、'/_種と認めて, その理[i」を説明した. 奇妙な形態をしたl種は, 雌1点しか採集
されなかったが, g,,einnect・,echus属の第3の種と考えられ, しかも既知種とは彈著に異なるの
で, Qg1obipennisS.UENoという新名を'J-えて記破した. 他の1種は, _、南省西部の山確地帯に
広く分イtJ-するTli・echus,nacropsJEANNELに同定された.
References
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