Elytra,Tokyo,35(1):205-215,May30,2007 Additional RecordsofClytineSpecies(Coleoptera,Cerambycidae) fromtheOgasawara Islands(3) RevisedNotesontheCh1orophorusSpeciesfromMuko-jimaIsland1) TatsuyaNnsAT0 BioindicatorCo., Ltd.,Yarai-cho126,Shinjuku,Tokyo,162-0805Japan and Haruki KARUBE KanagawaPrefecturalMuseumofNatural History, 499Iryuda,0dawara, Kanagawa,250-0031Japan Abstract TwoC111orophorusspeciesfromMuko-jimaIslandof theOgasawara Islands are revised. Chto・,optic,・us masatakat and C ktlsama1 are illustrated and redescribedbasedon theholotypeandadditionalspecimens. IntroductoryReview Ch1orophorus kusamai wasdescribedon thebasisof themaleholotypespecimen collectedfromMuko-jimaIslandof theOgasawaraIslandsonMay22,1974,andwas suggestedintheoriginaldescription(SAT0,1999)asarelativeofC kobayashiiKOMIYA fromtheChichi-jimaandHaha-jimagroupsof thesameislands.Several yearsafter SAT0's description, NIIsATo and KARUBE (2000, 2002), additionally recorded C kusamai on the basis of a series of specimens collectedby recent field survey of Muko-jimaIsland,andredescribedandillustrateditshabitusandmalegenitalorganin comparisonwithC kobayashii. TheyalsorecordedCbonlnensisKANOfromthesame islandandsuggestedthepeculiaritiesin thepalebrownpubescentbodywith reduced blackmaculationon thepronotumandelytra. Misarrangement wasclearedby reexaminationof themalegenital organof C kusamai. Duringthestudyof theCh1or〔)phorusspeciesfromtheOgasawaraIslands, KARUBEfoundout thedifferenceinmalegenitalorganbetween“C kusama1”athand andtheillustrationinSAT0'soriginal description; theparameresweredrawnasslender 1)ThisstudyissupportedbyaGlobalEnvironmentalFund(F-051) 206 TatsuyaNIIsAToandHaruki KARUBE andshallowlydehiscentonesinSAT0'stext-figure,whilein“C kusamai' athandthey showabroad,robustanddeeplydehsicentformrelatedtothoseofC kobayashii,aswas 「ope「tedinourpreviouspaper (NIIsAT0& KARUBE, 2000, p 440, fig 9). SAT0's illustration seems to show acloser relationship to thoseof C boninensls. It is most probablethatC kusamatisnotaspeciesrelatedtoC kobayashiiaswassuggestedinthe originaldescription. ThequestionwaseasilysolvedbyexaminationoftheholotypeofC kusama1.As wasexpected,thetrueC kusamainodoubtbelongstothesamelineageasC bonlnensls andisregardedasasiblingspeciesonMuko-jimaIsland. 0ntheother hand,our“C kusama1”athandwasanundescribedspeciestruelyalliedtoC kobayashii,andrecently described under thenameofC masatakai (NllsATo& KARUBE,2006). TherealtionanddistributionoftheseOgasawaraspeciesbelongingtothegroupof Cyayeyamenslsaresummarizedagainasfollows: SubgroupofC boninensls CbonlnenslsKANO:Chichi-jimaIs.?,0toto-jimaIs.,Ani-jimaIs.,Nishi-jimaIs. andMinami-jimaIs. (Chichi-jimagroup),Haha-jimaIs.,Mukou-jimaIs.,Ane- jimaIs andMei-jimaIs. (Haha-jimagroup). C kusamai M.SAT0:Muko-jimaIs. (Muko-jimagroup). SubgroupofC obayashz1' C kobayashii KoMIYA: 0toto-jimaIs.,Ani-jimaIs.,Higashi-jimaIs.,Chichi- jima Is. (Chichi-jima group), Haha-jima Is., Mukou-jima Is., Ane-jima Is., Imoto-jimaIs andMei-jimaIs. (Haha-jimagroup). CmasatakaiNIIsAToetKARUBE:Muko-jimaIs andNakodo-jimaIs. (Muko- jimagroup). In the followinglines, wearegoing torevise twoCh1orophorusspecies from the Muko-jimagroupof theOgasawaraIslandsbasedupontheabovereexamination. Thepresentpaper isdedicatedtothelateDr.MasatakaSAT0whounexpectedly passedawayinthesummerof2006.Hewasinterestedinthecoleopteranfaunaofthe Ogasawara Islands, particularly fromthezoogeographical viewpoint, andalsogave manyusefulsuggestionsforourcollaborativestudies.WedescribedCmasatakai from Muko-jimaIslandasthelastdedicationtohisentomological life(Elytra,Tokyo,34,p. 222). Ch1orophoruskMsamai M. SAT0,1999 [Japanesename:Mukojima-tora-kamikiri] (Figs.l,5) Ch1orophoruskltsama1M.SAT0,1999,Elytra,Tokyo,27,p47,figs.1-3;typelocality:Muko-jima,0gasawara Islands. Ch1orophorusbonlnenssi:NIlsATo&KARUBE,2000,Elytra,Tokyo,28,p 441, fig8. Bodylength(measuredfromapicalmarginofclypeustoelytra1apices)9.0-9.5mm Ch1orophorusfromMuko-jimaIsland 207 Figs.1-4. Chtorophoruskusatnai M.SAT0,C masatakai NnsAToet KARUBE and their relatives, holotypes. - 1, C kusamai from Muko-jima Is; 2, C boninensis KANOfrom“0gasawara- jima”;3,CmasatakaifromMuko-jimaIs;4,CkobayashiiKoMIYAfromHaha-jimaIs. 208 TatsuyaNIIsAToandHaruki KARUBE in 9.6mm in早. , Medium-sizedspeciesdirectlyrelatedtoCboninerisls,wellconvex,blackinmostof integument,providedwithordinaryblackmaculationonpronotumandelytrathough ratherstrongly reduced. Body denselyclothedwith light greenishgray pubescence. Pronotum andelytraclothedwith light yellowishbrownpubescence, providedwith reducedblackpubescentmaculationasfollows: - pronotum:1) apairofsmallspotsat sidesof themiddle,2)somewhat transversespotatcentrejustbehindmiddle,deeply angulateat themiddleofposteriormargin;elytra:3)smallhumeralspot,4) L-shaped bandatalevelbetweenbasaltenthandthird,almostattainingatbasetothehumeral spot,5) twotransversebandsatmiddleandonapical fourth,barelyreachingboththe marginsornot reachingtheexternalmargininthemiddle. Head small in contrast with well expanded pronotum, 0.70 times as wide as pronotum,closelypunctured;fronsslightlylongerthanwide,gentlyraisedtowardsthe midlinewhichformsafinegrooveintheposterior2/5;eye-lobein frontal viewalittle deeper thangenaand2/3thewidthoffrons.Antennaerelativelyshort,attainingtothe middle in er thebasalthirdin早ofelytra.Pronotumrelativelylarge,1.25timesas wideasmaximumwidthatmiddle,weaklyarcuateatsides,slightlycontractedtoapex, withdiscstrongly convex, highest at basal 2/5, closely coarsely rugoseon surface. Scutellumlarge,roundedtriangular.Elytrashortandbroad,alittlelessthan2.0times as longasthehumeralwidth,slightly wider thanpronotum;sideswith completely roundedhumeri,stronglynarrowedinslightlyarcuatelinetoapices,whichareoblique, with blunt short dentsat externalangles; discwell convex, weakly rugosethanon pronotum. Venter of thoraces weakly rugose. Abdomen coarsely shagreened; anal ventritegentlyarcuateandslightlyemarginateatmiddlein ,simplygentlyarcuatein 早;analtergitegentlyraisedandtransverselytruncateatapicalmarginin ,moderately raisedtowardsmidlineanddeclivousandweaklyemarginateatapicalmarginin早.Legs stoutandrathershort,withhindfemoranot reachingelytra1apicesevenin . MalegenitalorganoftypicalconformationinthegroupofC yayeyamensisand similartothatofCbonlnensls. Medianlobealittlelessthan2/5thelengthofelytra, ratherweaklyarcuateandstronglydepressedinprofile,withapical lobenearly1/2the wholelengthofmedianlobe,moredistinctlynarrowedapicadthanthatofC bonlnensis, andshortlypointedat theextremity.Parameremoderatelynarrowedatexternalsides andbluntlypointedapicad,withstrongventralridgesat3/8,providedwithdenseshort setaenear apices; 8th tergiteslightlyemarginateat apex;8th sternitewidelydeeply emarginateatapicalmargin. Specimensexamined. [Muko-jimagroup] 1 (holotype),“0gasawara / Muko- jima /22May,1974 /M. IGAleg”“Holotype/Ch1orophoruskusama1M.SAT0,sp nov./ Det.M.SAT0,1999(redlabel).”;2 ,Muko-jimaIs.,27-VI-2000,H. KARUBE leg; 1 ,sameastheprecedingbut 22-VI-2003; 2exs.,sameastheprecedingbuf f2- VI-2003. Com◆paratlvespecimensexammedof C boninensis. l早(holotype), “0gasawara- jima / legSAWADA(writtenbyKANO)”“Ch1orophorusboninenslsKANO(pink label C111orophorusfromMuko-jimaIsland 209 writtenby KANO)” “NSMT-I-C/17278” “HoLoTYPE/Ch1orophorusbonlnensis KANO, l933 (red label writtenby Y. KUROSAWA).” Thetruelocalityoftheholotypeismost a , probably Haha-jimaIsland. [Chichi-jimagroup] 1 ・ 0toto-jim Is. ,20-VI-2000 H KARUBE leg; l Shikano-hama, 0toto-jima Is., 25-VI-2005, H. KARUBEleg; l , , Shikano-hama - Hirone, 0toto-jimaIs.,12-VI-2006,H.KARUBE leg;1早& 2exs., Nishi-jimaIs.,25-VI-2003,H.KARUBEleg; lf,Uguisu-hama-ue,Ani-jimaIs.,27-VI- 1998,M. TAKAKUwAleg;1ex.,southernarea,Ani-jimaIs.,25-VI-2001,H.KARUBE leg;1ex.,Mansakuhama - Daichi,Ani-jimaIs.,4-X-2003, H. KARuBEleg; l 1早, , Minami-jimaIs.,22-V-2002, K. HoRIKosHI leg;5 ,1早,sameislandasthepreced- ing,1-X-2004,H.KARUBEleg. [Haha-jimagroup] I Mt.Kuwanoki, Haha-jimaIs., , 24-VI-1976, M. TAKAKUwA leg;2 Hasu-ike, Haha-jimaIs., 23-IX-1989;1ex., , Shizuka-zawa,Haha-jimaIs., 14-VI-2003,S.SuDAleg;2exs.,24-VI-2000,Mukai- jimaIs.,H.KARUBEleg; lex.,Mukai-jimaIs.,10-VI-2001,S.0MURAleg;2exs.,12- VI-2003, H. KARUBE leg; 2exs., Mei-jima Is., 13-VI-2003, H. KARUBE leg; l , Ane-jimaIs., 19-VI-1999, H. KARUBEleg. Distribution. OgasawaraIsis:Muko-jimaIs. (Muko-jimagroup). Notes. It isdoubtlessthatC kusamat isaspecieshavingcloser relationship toC. bonlnensis from theChichi-jimaandHaha-jimagroups. Twoallopatricspeciesshare suchuniquemalegenitalorganasthenarrowandbrieflydehiscentparameres. Ch1oro- phoruskusamai isnotsomuchspecializedinthemalegenitalorganfromCbonlnensis andonlydistinguished fromthelatterbythemoredistinctlynarrowedapical lobeof median lobeandparamere,moredistinct emarginationat apicesof 8th tergiteand sternite. From the pale brown pubescence, C kusamai iseasilyseparable fromC bonlnensis,thoughsuchcoloredpubescencemaybeanancestralstateandremindsusof C yayeyamensisKANOof thesamelineagemainly fromtheRyukyu Islands. In the rather specializedspecies, C boninensls, thecolour of pubescencebecomesgradually reddishtowardsnorthtosouthintheOgasawaraIslands. Thisspeciesseems toberaresincewewereabletocollectonly fiveadditional specimens in spite of our repeated visits to Muko-jima Island during 1999-2006. Ch1orophorusogasawarensisisalsogenerallyrareinthehabitat,onlyexceptingMinami- jima Islandof theChichi-jimagroup whereC. ogasawarerisis isoneofthedominant cerambycidspecies. Itmayhavebeencausedfromnon-existenceofcompetitionwith sympatricclytinebelongingtothesubgroupofC kobayashii,sinceanyspeciesof the subgroupdoesnot occur inMinami-jimaIsland. ChtorophorusmasatakaiNIIsAToet KARUBE, 2006 [Japanesename:Mukojima-kiiro-tora-kamikiri] (Figs3,7) Ch1orophorusmasataka1NIIsAT0etKARUBE,2006 Elytra,Tokyo,34,p 222; typelocality:Muko-jima Is Ogasawara Isis. C1/1orophorus k11sa'na1: NIISAT0 & KARUBE,2000 Ibid.,28,p 440, figs 4-5,10;2002, ibid.,30.p.254; 210 TatsuyaNIIsAToandHarukiKARUBE KARuBE,eta1.,2004,Res.Rept.Kanagawapref.Musnat.Hist.,(12),p 78 Body length (measured fromapicalmarginofclypeustoelytra1apices) 8.4-10.6 mm in , 9.2-l2.0mm in早. Similar indorsalmaculationtotheprecedingspeciesbutdoubtlessbelongstothe same lineage as C kobayashii. Medium-sized,moderately convex, black inmost of integument.Bodydenselyclothedwithlightgreenishgraypubescence. Pronotumand elytraclothedwithlightgreenishyellowpubescence,thoughslightlydarkeronprono- tum,providedwithreducedblackpubescentmaculationasfollows: - pronotum:1) a pair ofsmallspotsatsidesjustbeforemiddle,2) pair ofspotsatcentrejust behind middle, becoming larger and approximateor small and fairly apart according to individuals; elytra: 3) smallhumeralspot, 4) J-shapedbandat a level between basal 1/20and3/10,fairlyapart at basefromthehumeralspot,sometimesdividedintotwo isolatedspots, 5) two incomplete transverse bandsat middleand on apical fourth, almostalwaysreachingboththemargins. Headmoderate includingwell prominent eyes,more than 0.75 timesaswideas pronotum,weaklyrugose;frons12timesaswideaslong,weaklyraisedtowardsmidline whichformsaweakcostainposterior2/5;eye-lobeinfrontalviewnearlyequalindepth togenaand3/4 thewidthof frons. Antennae fineandrather long, attaining toapical thirdind''orjustbehindmiddlein早ofelytra.Pronotummoderate,slightlylonger than themaximumwidthatmiddle,gentlyarcuateatsides,moderatelycontractedtoapex, with disc rather distinctly convex, highest at basal 3/8, closely coarsely rugoseon surface.Scutellumlarge,roundedtriangular.Elytramoderateinlength,about2.3times as long as the humeral width, 1.25 timesas wideas pronotum; sides with humeri somewhatroundlyexpanded,subparalleltomiddlethenslightlyarcuatetoapices,which areoblique,withshortbluntdentsatexternalangles;discmoderatelyconvex,weakly rugose.Venterofthoracesweaklyrugose.Abdomencoarselyshagreened;analventrite impressedalongmidline inapical half andslightly arcuateatmargin ind'', almost transverselytruncatein早;analtergiteweaklyraisedandtransverselytruncatewithvery shallowemarginationatmiddleofapicalmarginind'l,slightlyraisedanddeclivousand weaklyemarginateat apical margin in早. Legsratherslender andlong, withhind femoraslightlyexceedingelytra1apicesin . Malegenitalorganbasicallysimilar tothat ofC kobayashii.Medianlobealittle morethan7/20thelengthofelytra,hardlyarcuateinprofile,withshorterapical lobe whichis4/9thewholelengthofmedianlobe,gentlynarrowedapicad,bluntlyrounded at apexofdorsalplate.Parameres large,constrictednearbasal fifth, thenmarkedly broadenedbeforeapices, narrowlybut deeplydehiscent inapical 5/6, provided with Figs 5-6. Malegenital organof Ch1orophorus kusamai M. SAT0 fromMuko-jima Is. (5)andC. boninensisiKANOfromHaha-jimaIs. (6). - a,Medianlobeinlateralaspect;b,dittoindorsal aspect; c, tegmen in lateral aspect; d, ditto indorsalaspect;e,8thabdominal tergiteindorsal aspect; f,8thabdominalsterniteinventralaspect.Scale1mm. 211 ch1ofophorusfromMuko-jimaIsland 212 TatsuyaNIIsAToandHarukiKARUBE ventralridgesatbasal2/5;8thtergitetransverselytruncateatapex;8thsternitealmost bl-lobed, deeply concaveatmiddleof apicalmargin. Specimense:x;amined. 25 8(l fromMuko-jimaIsand1早fromNakodo-jima , Is., 0gasawaraIsis. (thetypeseriesincludingtheholotype,andthecollectingdatain r,, detailareshowninNIIsAT0& KARUBE(2006,p 222); l 1一一F nea Oyama Muko , jimaIs.,18-VI-2006,H.KARuBEleg; lf,1早,almostofthesamedataasthepreceding butsouthernareaofMuko-jimaIs. Comparativespecimense:x;amined of C kobayashii. [Chichi-jimagroup] 1ex., Kuro-hama - Ichino-tani, 0toto-jimaIs.,29-VI-1998,M.TAKAKUwA&H. KARUBE leg;4 ,northernarea, 0toto-jimaIs.,19-VI-1999, H.KARUBEleg;13exs.,almost samedataastheprecedingbut20-VI-1999;3 ,3早早,0toto-jimaIs.,20-VI-1999,H. KARuBE leg; 1早, almost samedataas theprecedingbut 20-VI-2000; lf, 2早早, Kuro-hama - Ichino-tani,0toto-jimaIs.,16-VI-2003,H.KARUBEleg;l Shikano- , hama - Hirone,0toto-jimaIs.,17-VI-2003,H.KARUBEleg;2 ,1早,samelocality andcollectorbut20-VI-2003;2 ,1早,Mansaku - Daichi,Ani-jimaIs.,15-VI-2001, H.KARUBEleg;2 Mansaku-hama,Ani-jimaIs.,25-VI-2001, H. KARUBEleg; 2 , d'ld1',southernarea,Ani-jimaIs.,25-VI-2001,M. TAKAKUwAleg;1 , Mansaku - Daichi, Ani-jima Is., 4-V-2003,H. KARuBEleg; 3 ,1早,samelocality,4-X-2003, H. KARUBEleg. [Haha-jimagroup] I (holotype),“Holotype(orangelabel)”“Haha- jimaIs. /Nagahama - Kitamura/13~15-X-1973/ T.KOBAYASHIleg”“Ch1oropho- ruskobayashiiKoMIYA,1976/Holotype(redlabel) (allwrittenbyZ.KoMIYA);2(l?, Hasu-ike,Haha-jimaIs.,23-IX-1989;1早,Shizuka-zawa,Haha-jimaIs.,14-VI-2003,S. SUDAleg;2早早,Mukou-jimaIs.,24-VI-2000,H.KARuBEleg;1早,sameislandasthe preceding, 10-VI-2001, M. TAKAKuwA leg; l 2早早,sameislandasthepreceding, , 12-VI-2003,H.KARuBEleg;1早,sameislandasthepreceding,emergedfromhoston V~VII-2005,H. KARUBEleg;1早,Ane-jimaIs.,15-VI-2003,H. KARUBEleg; lf, Imoto-jimaIs.,22-VI-2006,H.KARUBEleg;3 ,sameisland,emergedout fromhost inVI-2006,H.KARUBEleg; l 29 Mei-jimaIs., l3-VI-2003,H. KARUBEleg. , , Distribution. Ogasawara Isis: Muko-jima Is and Nakodo-jima Is. (Muko-jima group). Notes. ThisspecieswaserroneouslyrecordedasC kusamai:duetoamisidentifi- cation based on the original description (NIIsATo & KARUBE, 2000, 2002). We thoughtlesslybelievedin thecomparativecomment of thedescriptionandconcluded that C kusamai is aspecies related toC kobayashii. Recently, weexamined the holotypeofC kusamaipreservedintheEntomological Laboratory,EhimeUniversity, andrealized that it belongstothelineageofC bonlnensis. Therefore,theCh1orophorus speciesinquestionwasdescribedasanewspeciesofthelineageofC kobayashii inour Figs 7-8. MalegenitalorganofCh1orop11or1lsmasatakai NllsAToet KARuBE fromMuko-jima Is. (7)andC kobayashii KoMIYAfromHaha-jimaIs. (8). - a,Medianlobeinlateralaspect;b, ditto in dorsalaspect;c, tegmen inlateralaspect; d,dittoin dorsalaspect;e,8thabdominal tergiteindorsalaspect; f,8thabdominalsterniteinventralaspect.Scale1mm. Chlo「oPhorusfromMuko-jimaIsland 213 7b _ 214 TatsuyaNIIsAT0andHarukiKARUBE recentpaper(NIISAT0& KARUBE,2006). Though sharing many respects, the twosibling species, C masatakai and C kobayashii KoMIYA, areeasilydistinguished fromeachotherbynot onlytheblack maculationontheelytrabutalsotheirspecializedmalegenitalorgans.Theapicalpart ofthemedianlobeinCmasataka1iscompletelyroundedandexposingtheextremityof theventralplate, insteadofsimplynarrowedoneinC kobayashii. It isalsoevident in theconformationoftheparamerewhichismarkedlyelongateandbroadenedtoapical 2/5inC masatakai, though rather weaklysoinC kobayashii. Lightgreenishbrown pubescenceand reducedblackpubescentmaculationinCmasatakaiareeasilyrecog- nizablecharactersdiscriminating it fromC kobayashi1. Such apubescent pattern is almost perfectly identical in twosympatric Ch1orophorus on Muko-jima Island, C masatakai andC kusamai,andseemstohavebeencausedbyconvergenceinthesmall habitatoftheislandgroup. Ch1orophorusmasatakai is themost dominantspecies inall the threeclytines recorded fromMuko-jimaIsland,becauseof rather alongseriesofspecimenslisted abovewereobtainedbyourprevioussurveysafterthe2000's.Adultclytinesareusually foundontheblossomsofTerminaliacatappa,andalsoknownfromCiriumboninenseby acollectingrecord.Planchoneuaobovataisoneof themainhostplantsof theclytine, sincethefemaleusuallylayseggsonthebarksurfaceandtheadultsemergedout from dead trunks. Xy1otrechusogasawarensis KANO alsousesP. obovata ashost plant on Muko-jima Island. Acknowledgements Wewishtoexpressour heartythankstothelateDr.MasatakaSAT0ofNagoya, Drs.NobuoOHBAYAsHIof theEntomologicalLaboratory,EhimeUniversity,Matsu- yama, andMasatoshi TAKAKUwAof theKanagawaPrefectural Museumof Natural History, 0dawara,ShuheiNoMuRA of the National Science Museum (Nat. Hist ), Tokyo, for their usufu1suggestionand/or helpinexamining thevaluablespecimens includingthetypes,andalsotoDr. KoichiMATSUMOTO,ShinichiSUDA, for their kind cooperation in the field. Special thanksarealso due to Dr. Shun-Ichi UtNo for his constanceguidanceandcritical reviewoftheoriginalmanuscriptofthispaper. 要 約 新里達也・ 部治紀: 小笠原諸島におけるトラカミキリの記録(3). 聲島列島のクロトラカミ キリ属に関する追加知見と訂正. - 小笠原諸島,lヒ部の 島列島に分布するクロトラカミキリ属 C111orophorusの2種, ムコジマトラカミキリC kilsamaiM.SAT0とムコジマキイロトラカミキリ CmasatakaiNIlsAToet KARuBEに関する知見の追加と訂正を, その研究の経緯も併せて報告し た. ムコジマキイロトラはNIIsAT0&KARuBE(2000,2002)などによってムコジマトラの誤同定 のもとに再記録されていたが, 同著者によって最近になってオガサワラキイロトラカミキリに近