New Records of Chinobrium (Coleoptera, Cerambycidae) from Thailand, with Redefinition of the Genus

2005·4.1 MB·

by  Niisato, T

Elvt,a,nokyo,33(1):114-l20,May30,2005
NewRecordsofChznobrzum(Coleoptera,Cerambycidae) from
Thailan with Redefinitionofthe Genus
TatsuyaNIIsATo
BioindicatorCo.,Ltd.,Yarai-cho126,Shinjuku,Tokyo,162-0805Japan
Abstract TwospeciesofthegenusChinob1・lu111,Cmodi(fasciatu'11GREssITTand
C opaci11n(HoLzscl.luH),arenewlyrecordedfromThailand.Thegenusisredescribed
basedonthetwospecies,anditssystematicpositionisbrieflydiscussed.
Introduction
ThegenusChlnob1・iumGREsslTT,1937isasmallgroupofthetribeObriiniand
composedofthreeknownspecies.Itisapeculiargroupamongthetribeinhavingsuch
apeculiarhabitus intermediatebetweenLonglpalpusandStenhomalusasthewidely
separatedeyes,theelongatepalpiandantennalscape,theslenderbutlaterallyswollen
pronotumwithoutrecumbentpubescence,andtheampleelytra.
TwospecimensofChinobriumwascollected fromnorthernThailandby Messrs.
MinoruTAOandManabu KAMIMURA, respectively,andbrought tomy handthrough
their courtesy. It wasavery interestingdiscovery for the faunaofThailand,sinceno
representativeofthegenushassofarbeenknownfromthecountry.A量oracarefulex-
amination, it was revealed that thespecimens inquestionbelong to two different
species,ofwhichCmediofatsclatun1GREssITT,1937previouslyknown fromSoutheast
China,andC.opacum(HoLzscHUH,1984)alsoknownfromtheneighboringcountries
inIndochina.Inthefollowinglines,IwillnewlyrecordthemfromThailan andaddi-
tionallydescribethediagnosticcharactersofthegenusbasedonthetwospecies.
Iwishtodedicatethispaper tothelateDr. MichioCHUJ0whowasoneof the
greatestcoleoptero1ogistsbeforeandafter theWorldWar11. I couldnothavecontin-
uedmystudyoftheSoutheastAsiancerambycidfaunawithouthisactivity.
GenusChinobriulltGREssITT,1937
Chlt1ob1・iutnGREsslTT,1937,LingnanSci.J.,16、p 449;1951,Longicornia,2,pp.161,166;typespecies
Cmodi(:fasclat11t11GREssITT,1937. - HoLzscHUH,1990.Ber.Nat.-med.Ver.Innsbruck,77,p.187
Basically similar to Longlpalpus in thestructures ofmouthparts, theventer of
thoraces,andalsothevenationofhindwings,butdiscriminatedfromthelatter inthe
broadandconvexbodyingeneral, theprominentsidesandunevendiscofpronotum,
NewRecordofCill,10/),・111,;1fromThailand 115
lightlysclerotizedapicalthreeabdominalventrites,andsoon.
Body broad,slightlyconvex,withrather longappendages, dull on integument;
pubescencedensethoughshortandverythin,usuallyvelvetyonforebodyandventer.
Headlongandslightly declivous,depressedabove,withmediangroovefinein
frontanddeeperposteriad; fronsslightlywider thanlong, fronto-clypea1suturearcuate
anddeep;clypeusnot raised,withtransverseapicalmargin;mandiblerelatively long
andslender, witharcuateandacutely toothedapical part, densely setosealong inner
margin;maxillawithgalealongpedunculate-forme lacinianotsodevelopedandal-
mosttriangular,truncateoninnermargin;palpusslenderandvery long,especially in
terminalsegment; labiumwithmentumtransverse, ligulaofY-shapedquadratelobes,
palpuslong;eyesmoderatelyprominent, rather finely facete widelyseparatedabove
andbelow,withupper lobenotattainingtoalevelofinnermarginofantennalcavity.
Antennaelong,exceedingelytralapicesevenin female,providedwithaverysparse
rowofhairsalongundersidesofsegments1-5or6;scapeelongateandweaklyclavate,
nearlyequal inlength tosegments2and3combined,segment3alittlelonger than
segment4,segment5thelongestandslightlylongerthanscape.
Pronotummoderateinlengthandwidth,slightlydivergent toapex,widestnear
middle,distinctlyswollenatalevelbetweenanteriorandposteriorconstrictions;disc
convexinapicalhalfandthendeclivoustobasal fourthwhichisweaklyraise basi-
callyprovidedwithtwopairsofweakswellingsatsides.Scutellumnarrow,rounded
apicad.
Elytradistinctlybroaderthanthebasalwidthofpronotum;sideswithrounded
humeri,arcuatelydivergent tonearapical fourth,completely roundedatapices;disc
almost flattenecしwith costaeextending fromhumeri toapical thirdorso,strongly
puncturedat least inbasal 3/4.Hindwing lightlysclerotized,withsimplePcand
IA3十2AwhichagreewellwiththoseofLo11glpalpus.
prosternumwithintercoxa1processstronglycompressednearmiddle,apicalpart
stronglydilated; forecoxalcavitiesroundedexternally,completelyclosedbehinddue
toinnerextensionsofpleuralprocesses.Mesosternumwitharcuatetransversedepres-
sionatapical2/5,stronglyraisedposteriad,withmesosternalprocessbroadandtrian-
gularlyconcaveatapex,midcoxalcavitiesalmostclosedexternally. Metasternum not
convex,rathernarrow,slightlydilatedposteriad.
Abdomenjn femalebroad,stronglyabbreviated,with1stventritenearlytwiceas
longasthe followingscombined,apical threelightlysclerotized,analslightlyemar-
ginateatmargin.
Legslong,withmoderatelyclavatefemoraandshorttarsi.
Range. Himalaya,SE.China,IndochinaandSriLanka.
Notes. It isnodoubt thatChinobriumhasacloserelationshiptoLonglpalpus,
sjncethetwogenerashareseveralbasicstructures,asfollows:headlongandslightly
declivous,withwidelyseparatedeyes;prosternumwithintercoxa1processcompressed
nearmiddleanddistinctly dilatedapicad; hindwingwithsimplePcand tA3十2A
vejns;mesosternumwith transverseconcavitybeforecoxalcavities;metasternumna「一
116 TatsuvaN11sATo
row.ChinobriummayberegardedasasubgroupofLonglpalpus, thoughit ishardly
discriminatedfromthelatterbythebroadandconvexbody,thedistinctlyswollensides
ofpronotumandthemembranoussegmentsofthefemaleabdomen.Longlpalpushasa
slenderandflattenedbody,anelongatepronotumwithslightlyarcuatesidesandwell
sclerotizedbasalthreeventrites. IwasunabletoexaminethemaleofChinobriumsince
all thepreviousrecordsofthegenuswerebasedon femalespecimens.Itisexpected
thatkeycharactersclearlyseparablethetwogenerawillbefoundontheirmalegenital
organwhenthemaleChinobriumisfoundinnear future.
ThegenusChlnobriumiscomposedofthreeknownspecies,viz.,Cmed可ascia-
tum GREssITT (type species!) from Southeast China and Thailand, C opacum
(HoLzscHUH) fromtheHimalayasandIndochina,andCvesculum(HoLzscHUH,1986)
fromSri Lanka.Accordingtotheoriginaldescription, thelastspeciesseemstobea
rather isolatedmember of thegenusbecauseof itsslightlysmaller body (5mm in
length),withtheuniquecrossdarkmaculationontheposteriorpartsofelytra.
TheecologicaldataofChinobriumarealmostunknownsincetheadultsaresel-
dom foundinthefield. Ihavepreviouslyexaminedonlyfiveexamplesbelongingto
twospeciesofthegenuswhichwerecollectedonlivingtreesinthedaytimeandthe
deadwoodinthenighttime.
KeytoSpecies
1(2)Smallandslenderspecies,nearly5mminlength;elytrapaleyellow,withblack
maculations, i.e.blackbandbehindbasesandblackcrossmaculationonapical
2/3;SriLanka Cvesculum(HOLZSCHUH)
2(1) Largeandbroadspecies,morethan10mm inlength;elytrareddish,withblack
marginedyellowband.
3(4)Pronotumstronglyconstrictedbeforeandbehindthelateralswellings;elytrapro-
videdwithyellowbandwhichisconstrictedatsuture;SE.ChinaandThailand
C medzofascfa加mGRESSITT
4(3)Pronotumweaklyconstrictedbeforeandbehindthelateralswellings;elytrapro_
videdwithyellowbroadban whichisblackmarginatedposteria and inter_
rupted by obliquearcuateblack bands from anterior part to themiddle; Hj_
malayaandIndochina C.opacum(HOLZSCHUH)
Chinobriummediof‘asciatu″ tGREsslTT,1937
(Figs.1&3)
Chinob1'iu'n'nediofasclatumGREssITT,1937,LingnanSci.J.,16,p449,pl 4,fig.1;1951,Longjcornja,2,
p.166.
Female. Body length (from apical margin of cIypeus to elytra1 apices)
10.4mm;bodywidth(acrosshumeriofelytra)2.4mm.
Colourbrown,shagreenedexcept forweaklyshinyelytraandappendages,with
NewRecordofCill,lob,・It,1fromThailand 117
,
f -
lJ ,
f-
2
Figs. 1_2. C1/;inob1・iumspeciesfromnorthernThailand. - 1,C 1,1edi)fasciat1l'nGRESSITT, female
2,Copacu,11(HoLzscHUll),female
blackmarginatedyellowbandnearthemiddleofelytra;headbrown,blackoneyesand
alongmarginsofmandibles,yellowishatpalpi,maxillaeandapicalmarginoflabium;
pronotumandscutellumbrown;elytradarkyellowishbrown,slightlyyellowishapicad,
withablackmarginatedlightyellowish-brownbroadbandjustbeforemiddlewhichis
stronglyconstrictednearsutureandslightlyarcuatenearexternalmargins;ventralSu一「
facebrown,withyellowishapicalthreeventrites; legsbrown,slightlypaler intibiae.
Bodyingeneraldenselyclothedwithfinepalepubescence,andthinlyscatteredwith
paleyellowshorthairs;antennaefurnishedwithsparserowsofpaleyellowhairsalon9
undersjdesofsegments1-6;thoracesandabdominalventritesdenselywithvelvetysil-
verypubescence.
Head includingeyesslightlywiderthan themaximumwidthofpronotum, de-
pressedabove,shagreenedthoughprovidedwithafewpuncturesatocciput; frons2/3
the length ofbasal width, witha finemediangroove though thegroovebecomes
deeperatvertex;eyesseparatedaboveby3/5thewidthofocciput.Antennaeslender
andmuchlonger,exceedingelytra1apicesatmiddleofsegment8;scapemoderately
118 TatsuvaNIIsATo
clavateandlonger thansegments2and3combined,alittleshorter thanthelongest
segment4,terminalsegmentslightlyarcuate.
Pronotumrelativelyslender, 1.3 times as longasthemaximumwidth,alittle
wideratapexthanatbase;sidesraisedbehindapex,stronglyconstrictedatapical2/9,
arcuatelydilatedtojustbeforemiddlewhichisthewidest,thenarcuatelynarrowedto
basal 2/9 which is constricte weaklyarcuatetobasalangles;discdistinctlyconvex
towardscentralhighestpart,withtwopairsofroundedweakswellingsatapicaland
basal5/12,withweaklyraisedbasal collar,shortmedianridgesnear apexandbase,
shagreene withafewpuncturesondorsum.Scutellumelongatetongue-shaped.
Elytramoderatelylong,2.6timesaslongasthehumeralwidth,3.0timesaslong
as pronotum;sideswith roundedhumeri, largelyarcuately emarginatenearmiddle,
moderatelyamplenearapical fourthwhichisthewidest,completelyroundedatapices;
disc almost flattene arcuately raisedaroundsuturebehindscutellum,stronglypunc-
turedinbasal 7/10, thenfinelysoandonlyshagreened inapical fifth,withdistinct
costaeextendingfromhumeritomiddleofapical2/5.
Ventralsurfacefinelyshagreenedthroughout;prosternuminapical2/5shinyand
providedwithstrongtransversefurrows,withapicalpartofpresternalprocessconcave
ondorsum.
Legslongandmoderatelystout,withhind femurweaklyclavateapicad,1sthind
tarsalsegmentequal inlengthtothefollowingtwosegmentscombined.
Specimene)cammed. 1 DoiSuthep, Chiang Mal Prov., N. Thailand, 22-IV-
,
1985,M.TAOleg.
Distributio11. SE.ChinaandN.Thailand(newrecord).
Notes. Thisspeciesissimilar ingeneralappearancetoC.opacum,butdistin-
guishedat firstsight fromthelatterinthemedianyellowbandofelytrawhichisdis-
tinctlydilatedexternallyinsteadoftriangularone. Itisaveryinteresting factthat the
tworelatedspeciesoccuralmostsympatricallyinnorthwesternThailand.
Chinobriu''topaculn(HoLzscHUH,1984)
(Fig2)
Sten/10'nahlsopacusHoLzscHuH,1984,Ent basil.,9,p348, fig.10; typelocality:Chasi Lakha,SW
Bhutan.
C11inobt'ill'nopacu'11:HOLzScHUH,1990,Ber.Nat.-med. Ver. Innsbruck, 77, p. 187. - N1lsATo, 1998,
Elytra,Tokyo,26,p467,fig4;localityrecord:MandalayDiv.,Myanmar;2004,ibid.,32,p.124;Io_
calityrecord:BorikhamxaiProv,Laos.
Specimen examined. 1?, Doi Sung, N. Thailand, 10~17-V-1991, M. KAMl_
MURAle9.
Distribution. Bhutan,Myanmar,Thailand(newrecord)andLaos.
Notes. This species was carefully described in the original description by
HOLzscHUH(1984)andwasredescribedbyNllsATo(1998a).Thesinglefemalespeci-
NewRecordofChinobriumfromThajIand
119
l a- c l e_h
2mm 0.5mm
Fi9・3・ Chinch「iummediOfasciatumGREssITT,female. - a,Habitusinlateralvjew;b,habitusIndor_
SalView;C,the「acesandabdomeninventralview;d,righthindwing;e,rjghtmandjblejnventral
View; fdittoindo「Salview;g,1abiuminventralview;h,rightmaxillainventralvjew scale:2mm
fora-d,0.5mmfore-h.
l20 TatsuyaNllsAT0
menexaminedhasthebroadenedbody,especiallyinthepronotum,whichhasdistinct
constrictionsneitherbehindapexnorbeforebase.Thisspecimenalsohasthedarkened
colorationingeneralandthelongslenderantennalscape.However,itmayberegarded
asamereindividualvariationofthesamespecies,C.opacum.
Acknowledgements
IwishtoexpressmydeepgratitudetoDr.Shun-lobiUENooftheNationalSci-
enceMuseum, Tokyo, for hisguidanceand readingtheoriginalmanuscriptof this
paper,andtoMessrs.MinoruTAOofYokohamaandManabuKAMIMuRAofTsukuba
forofferingtheinvaluableChinob1,tumspecimensusedinthisstudy.
要 約
新里達也: タイから新記録となるC1linob,iu1n属2種と属の再定義. - C/finch,・i,tm属は, ヒ
メアメイロカミキリ属Longlpalpusに近緑の, わずか3既知種からなるアメイロカミキリ族の小
属である. タイからはこれまで未記録であったが, 本論文においてCmediofasciatim1およびC
opacumを記録した. このうち,原記繊以降初めての記録となる属の基準種C.,nedoifasc,atun,を
タイ産の標本をもとに西一記,成し, あわせてChinch,・,urn属の再定義を行った.
References
GREss1TT,J. L.,1937. New1ongicornbeetlesfromChinam(Coleoptera:Cerambycidae). LingnanSci.
J,16:447-456,pl 4.
- 1951. LongicombeetlesofChina. Longlco1nla,2:1-667十pls.l-21.Lechevalier,Paris.
HoLzscHUH,C.,1984. Beschreibungyon24neuenBockklifemausEuropaunciAsien,vorwiegendaus
clemHimalaya(Coleoptera,Cerambycidae). Ent basil.,9:340-372.
- 1986. Zwolf neue BockkafemausEuropaundAsien(Cerambycidae,Col). Koleopt.Rdsc/1.,
58:121-135.
- 1990. BeschreibungvonneuenBockkafernausclemHimalaya(Insecta:Coleoptera:Cerambyci-
dae). Bel:Nat.-,ned.Ve,:lnnsb,・uck,77:185-197.
- 1995. Beschreibungvon65neuenBockkafernausEuropaundAsien,vorwiegendausThailand
undChina FB Be,:Wien,(4):1-63.
NllsATo,T.,1998a. NewspeciesanddistributionrecordsofthetribeObriini(Coleoptera,Cerambycidae)
fromMyanmar. Elyt1・a,7lokyo,26:461-472.
1998b. Additionalaccount forLonglpapusaplcalis(Coleoptera,Cerambycidae). Jpn.J syst.
-
Ent.,4:301-302.
- 2004. New records of two obriine species (Coleoptera, Cerambycidae) from Laos. Elyt,a,
「okyo,32:I24.