A New Species of the Genus Xylotrechus (Coleoptera, Cerambycidae) from Northern Vietnam

2006·3 MB·

by  Wakejima, T

Eli,t/-a、Tok、,o,34(1):233-238,May20,2006
ANewSpeciesoftheGenusXy1otrechus(Coleoptera,Cerambycidae)
fromNorthern Vietnam
TetSut0 WAKEJIMA
105-801,432Terada-cho,Hachiohji-shi,Tokyo,193-0943Japan
Abstract AremarkablenewclytinespeciesbelongingtothegcnusX1,lot・,colitis
CHEvRoLATisdescribedfromnorthernVietnam.Thisnewspeciessharesbasiccharacters
with .vi//Io川VILLARDand 111ag111ncllsPlc.The 'v/011・colitisl,1//10,11groupisproposed
forthesethreespeciesofthegenus.
AninterestinglargeandhairyspeciesoftheclytinegenusXy1ot1-echilsCHEvRo-
LAT was collected from ilaGangof northernVietnam, approximateto theborderof
YunnanProvinceofChina. Itisobviousthattheclytinespecieshasseveral common
characters with .v!//Io川VILLARDfromJapanand .,nagnjfclfsPIcfromLaos,butis
easilydistinguished fromthembythehairlyblackbodywithabroadyellowbandon
theelytra.Althoughonlyonemalespecimenwithslightlydamagedbody isexamine
Iamgoingtointroduceitintoscienceinthispaperbecauseofthepeculiarityofthe
species.
Beforegoing further, IwishtoexpressmydeepgratitudetoDr.KiyohikoIKEDA
forhiskindadviceandencouragementtothepresentstudy,andtoDr.TatsuyaN1lsATo
forgivingmemany importantinformationoftheClytiniandreadingtheearlydraftof
themanuscript. IalsothankMr.YasuhikoITOforcheckingtheEnglishdescriptionand
Mr.YoshiyasuKusAKABEfor fendingsomeinvaluablematerials forcomparisonwith
thenewspecies.
Xy1otrechusaureounifasciatussp nov.
(Figs.1-3)
Male. Largespeciesforthegenus,withrobustandhairybody,characterizedby
broadpalegoldenyellowbandonelytra.Colormostlydarkbrowntoblackishbrown;
headblack, except for dark brownpalpi andamber clypeus and labrum; antennae
blackishbrown;pronotumblack;scutellumblackishbrown;elytrablack inbasalthir
yellowishbrowninapical2/3includingthemedianyellowishband;legsdarkreddish
brown, black atbases of femora, tarsi includingclawsdark reddishbrown; ventral
sidesofthoracesblack;abdomenreddishbrown.
Headsmallandshort,0.54timesaswideasthemaximalwidthofpronotum,with
234 TCtsut0 WAKEJlM^
alongitudinaldeepgrooverunningfromupperpartof fronstovertex,denselyclothed
withreddishbrownpubescence; fronstrapeziform,1.13timesaslongasthenarrowest
width at middle, without median carina, slightly swollen near clypeus, coarsely
sparselypuncture sparselypubescent;clypeusglabrous; eyesmedium-sized,weakly
swollen, separated from each other by 0.45 times the width of head; mandibles
coarselysparselypunctured,witha few thinhairs;occiputveryshort;genaedeep,1.25
timesasdeepaslowereye-lobes.Antennashortandstout,reachingbasal tenthofely-
tra,clothedwithafewyellowhairsonsegments3rdto6th,withsegments6-10more
or lesscompressedandslightlyserrateextero-apica11y; ratioof lengthofeachseg-
ments:2.5,1,2.6,2.5,2.2,2.2,2.1,1.5,1.5,1.1,-
.
Pronotum largeandglobose,0.85timesas longaswide,widestat basal third,
closelyprovidedwithirregular-sizedreticulations, furnishedwithsparsetuftsofblack
pubescence fromabouthalfnumbersofthereticulations, thepubescencebecoming
thickerand longer fromcenter tosides; discprovidedwithapairofarcuateshallow
groovesatsides,whicharefurnishedwithreddishbrownhairs,anddeeplyconcaveat
boththeanteriorpartandthemiddle,asmallconcavityatmiddlenearbasal margin,
andalsoashallow longitudinalgrooveextending fromcenter tojust beforebasalcol-
lar.Scutellumtriangular, roundedatapex,clothedwiththickblackishbrownpubes-
cence.
Elytra2.09timesas longasthebasalwidth,almostparallel-sided,withapices
slightly toothedatsutural anglesandroundedexternally; punctationcoarseandsome-
whatsparsenearbase, fineranddensernearmiddle,andveryfinenearapices;pubes-
cencesetigerous,usually formingtufts,partly longer nearbasal fifthandsparser in
apical fifth,blackishbrownincolor;eachelytronwiththe followingpubescentmacu-
lations:1)apairofvaguebrownpubescentspotsnearbase,2)apalegoldenyellow
broadbandatalevelbetweenbasalandapicalthird,zigzagonanteriormargin,oblique
thenabruptlyroundedupwardsjustbeforeexternalmarginonposteriormargin.
Pro-andmesosternadeeplyanddenselypuncture sparselyclothedwithblackish
brownhairs.Metasternumfinelydenselypunctured,clothedwithreddishbrownhairs.
Abdomen nelypunctured,denselyclothedwithyellowishbrownhairs.
Legsstout; femurdenselyandtibiarathersparselyclothedwithlongwavy yel-
lowishbrownhairs,thoughthehairsaremuchsparseronanteriorpairs;hind femora
not reachingelytra1apices;hindtarsiwith1stsegmentveryshort,1.42timesaslong
asthefollowingtwosegmentscombined.
Male genital organ relatively large, withmedian lobenearly 1/7 thelengthof
body.Eighthsterniteprovidedwithdenselongsetaeonapical marginexcept for the
arcuatelyemarginatemiddle,arcuatelyconcaveatsidesofbasalmargin.Eighthtergite
nearlytrapezoidal,denselyprovidedwithshortsetae,withapicalmarginslightlyemar-
ginatenearmiddleandroundlyangulateatsides.Medianloberelatively long,3.8mm
inlength,withapical lobemoderatelyarcuateinprofile,markedlyexposing there-
exedapicalpartofventralplate;dorsalplatebarelyreachingapical fourthofventral
plate,withbluntlypointedextremity.Tegmen4/5thelengthofmedianlobe;paramere
New・?、'/of'colitisfromNorthernVietnam 235
fromilaGan9,no「the「nVietnam
Fig 1 y1or1.ec11llsa11l.eollnlf11sc1e1rllsspnov.,holotype ,
236 TetsutoW、KIJIM、
Fig.2. HeadofXy/ot,・ec/111stlu1・eotl1ljfasciattlssp nov.,fromilaGang,northernVietnam
「'9 letnMamal・e 9-eniata,IMoe「d9iaannloobfe,1'la,/toerr,a・clovlitieisw;b-,・,cd1ollllo,l,・lfdl,oscrsi-aal,1v,siewsp. novll tron ila Gan9, northern
nife,e,8thtergite.scale1mm , c, fe9 fen, o「Salview; 8thster_
New 、'・lot,・colitisfromNorthernVietnam 237
rathernarrowly dehiscentjustafterapicalhalfmeasuredalongmidline,densely pro-
videdwithlongsetaenearapicesandshortonesatsides.
Babylength26.5mm;width:8.5mm.
Female. Unknown.
Typematerial. Holotype(S, ilaGang,ilaTuyenProvinceofnorthernVietnam,
VII-2004, (preservedintheNationalScienceMuseum(Nat.Hist),Tokyo).Theholo-
typeisslightlydamagedandthefollowingpartsaremissing:theapical foursegments
ofleftantenna,theterminalsegmentofrightantenna, theleftmidclaw,thele量hind
tarsusandtherightclaw.
Distribution. So far knownonly fromthetypelocality, HaGangofnorthern
Vietnam.
Notes. Asdescribedabove,thisnewspecieshascloserrelationshipfox.vi11ion1
VILLARDandXmagrlficusPfcamongallthemembersofthegenusXy1otrechus.The
threespeciessharethefollowingcharacteristics:1)Largeinsize,usuallyover25mm;
2)headverysmall,slightlymorethanhalfthewidthofpronotum;3)vertexprovided
withadeepmediangroove;4) fronswithoutclearcarina(usuallyvestigialor lacking
entirely);5)pronotumlargeandglobular,slightlywiderthanlong,widestattheposte-
rior tomiddle; 6)malepronotaldiscprovidedwithapairofarc-shapedgrooves in-
cludingsomeconcavities;7)elytraalmostparallel-sided;8)hind femoranotreaching
eIytra1apices;9)1stsegmentofhindtarsusveryshort,lessthan t5timesas longas
the followingtwosegmentscombined.
Consequently, Iwouldliketoproposeaspecies-grouptobenamed thevi11ion1
group for thethreespeciesofthegenusX、,1ot1-echusinviewofacombinationofthe
abovecharacteristics.
要 約
分島徹人:ベトナム;lヒ部より発見された大型のトラカミキリ属の新種. - 中国雲南省と
の国境に近い北ベトナムのハ・サンで2004年に得られた標本に基づき, トラカミキリ属の1種
をx、,,/of・fec/,uson,・,eounllasciat,,sspnov.と命名, 記,??した. 現在知られているのは1雄個体のみ
であるが, じゅうぶんにトラカミキリ属の他既知種と明確に区別できる特徴を備えている. 本
種は, 既知種のなかでは日本のオオトラカミキリX.、,1//10川およびラオスのXnlag,1,ficusに近緑
で, これら3種は, 1)体が非常に大型, 2)頭部は小さく, 頭頂に構状のl'l没部をもち, 前頭に
中央隆起を欠く, 3)前理199背板は大きく横長の;f」(形で, 准i では複数の小111般部をともなう1対の
孤状縦滿,を両側に備え, 4)上地は両側がほぼ並行, 5)後月退節は上地端を越えず, 後付節第1節
が短い, という特徴を共有する. この3種はトラカミキリ属において一つの単系統 を形成す
ると考えられるため, その特徴を記載し, 本論文においてX.、・1//io川種i (オオトラカミキリ種
-) を提唱した.
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