Elyt1a,To(kyo,28(2):429-435,November15,2000 AReviewofObrium1onglcorneBATES(Coleoptera,Cerambycidae) TatsuyaNIIsAT0 BioindicatorCo.,Ltd.,Yarai-cho126,Shinjuku-ku,Tokyo,162-0805Japan Abstract ThetypeseriesofObriu,111ongico,・,toBATESpreservedintheNatural HistoryMuseum,London, isreexamined,andthelectotypeisdesignated for a female specimenfromNagasaki.Thecorrectnameoftheothertwospecimensoftheseriesisde- terminedasStenho,nalus/!ghti.0b1・ium1onglcotneistransferredtothegenusSI,enhoma- 1usbasedmainlyonthethoraciccharacter.Thelectotypeisredescribedandillustrated,and sometaxonomiccommentsarealsogiven. Obrium1o,1glcorneBATESis oneof themost problematicalspeciesamong the well clarified faunaof theJapanesecerambycidbeetles. Although thenameofthis obriinehasbeenadditionally recordedbyseveralJapaneseauthors,all thosereports werebasedonmisidentificationofObriumJaponlcumPlc. True0.1ongicornehasnot yetbeenrediscoveredfromJapananditsadjacentareassinceBATES'originaldescrip- tionwaspublished. RecentlyIwasabletoreexaminethetypeseriesof0.1onglcornepreservedinthe NaturalHistory Museum,London. Inthispaper, Iamgoingtodealwithsometaxo- nomicalproblemsofthespecies.Theabbreviationsusedintheredescriptionarethe sameasthoseexplainedinpreviouspapersofmine. Beforegoing into furtherdetails, Iwishtoexpressmyheartfelt thankstoDr. Shun-IchiUENooftheNationalScienceMuseum(Nat.Hist),Tokyo, forhisconstant guidanceandreadingthroughtheoriginalmanuscriptofthispaper.Thanksarealso duetoMrs.SharonSHuTEoftheNaturalHistoryMuseum,London, forherkindhelp formyreexaminationofBATES'typespecimens. LectotypeDesignationofObrium1ongicorne anditsSystematicPosition ThetypeseriesofObrium1ongicorneBATESincludestwodifferentspecies;afe- maleistrue1ongicorneagreeingwellwithBATES'originaldescription,whiletheother twobelongtoarathercommonobriinespeciesinJapan,Stenhomalus11ght1GRESSITT. Althoughthetwospeciesaredistinctincolorationandstructure,theyhavesuchcom- moncharactersastheunico1oredandimmaculateelytra,andlarge,stronglyapproxi- mateeyes. ItismostprobablethatBATESconsideredtheseriesofthethreespecimens asrepresentinginfraspecificvariationofthesamespecies,andthetwospecimensbe- 430 TatsuvaNIIsAT0 longingtoS.lightiasthedarkformof0.1ongicorne. IwouldliketodesignatethepalefemalespecimencollectedatNagasakiasthe 1ectotypeof0.1ongicorne.Theothertwospecimensshouldbeexcludedfromthetype seriesof0.1onglcorne,sincetheywereidentifiedwithStenhomaluslighti. Lectotype: 0brium1ongicorneBATES:“JapanG.Lewis1910-320”“Nagasaki” , “0brium1ongicorneBat”“Nag 54346(undersideofmountingcard).” Accordingtothepresent reexamination, it isobviousthat 0.1ongicorneshould belong to thegenusStenhomalus. It istruethat thelectotypeof thisspecies looks likeamember of the Obriumdue toshort, broa uniformlyyellowishbody.Apart fromsuchanexternal appearance, 0. 1ongicornenot only has posteriorly wellex- tendedmetepisternum, aweak longitudinal costabetween themetepisternumand metepimeron,anddenserecumbentpubescenceonthepronotum,butlacksdeeplongi- tudinalconcavitybetweenthemetepisternumandmetepimeron,allofwhichareaut- apomorphiesofthegenusStenhomalusinthetribeObriini.Therefore, 0.1ongicorne shouldbetransferred from ObriumtoStenhomalus. Stenhomalus1ongicomls(BATES,1873),combnov. [Japanesename:Higenaga-ameiro-kamikiri] (Figs.1-2,3a) Obrium1ongtco''noBATES,1873, Ann. Mag nat.Hist.,(4),12,p. 155. - NllsATo, 1992, Illustr. Guide Identif.Longic.BeetlesJapan,p 485. Relativelysmallspeciesofuniformlylightyellowishbrownbody,withvqrylarge approximateeyes. Colour lightyellowishbrown,morereddishonforebody,infuscateatgenaeand alongmarginsofmandibles,ventralsurfaceexcept forapicalthreesternitesinvisible, eyesblack,slightlyshiny. Female. Headlargeandvoluminous,whollydistinctlyconvex,distinctlywider thanpronotum,coarselyshagreened,clothedwithpalepubescence,denselysoon fore bodyandnearantennalcavities,HW/PAt29,HW/PW0.85;fronsshort,stronglynar_ rowedanteriad,weaklyraisedthoughslightlyimpressedatsides,almosttransversely truncateatapex,withadeepmediangrooveextending fromapicalmargintoanterior part of vertex,FL/FB0.47, FB/FA t21; cIypeus1ong,strongly narrowedanteria transverselytruncateatapex,smoothonsurface,CL/CB0.33,CB/CAt30;mandjbles ratherlongandstout,stronglyarcuate,withacuteextremities;genaeveryshallow,one_ fourteenthofthedepthofeye-lobes,obtuseatcornersinfrontalview;vertexandoc_ ciputratherstronglyconvex,almostparallelatneck;eyesverylarge,stronglypromj_ nent latera coarsely facete remarkablyemarginateatinnermargins,separated from eachotherbyalittlelessthan2/li ondorsumand3/l ionventerofthewjdthofoc_ ciput.Antennaemoderatelylongandslender,reachingeIytra1apicesatbasal thjrdof segment 7, densely clothed with paleminutepubescence and sparsely with pale medium-sizedhairsonsegments1-4;scapemoderatelyclavate,widestatapical5/12, ReviewofObl・flail1o11gicol11e 43] Fjg. 1. Sle1ihonla/ils/011gic01-川s(BATES),combnov.,1cCtOtypefemale. shagreened,slightlylongerthansegment3,denselywithpaleshorthairs,segment2 djstjnctlyreduced,slightlylongerthanwidth,moderatelydilatedapicad,segments3 and4moderatelythickenedapica thelatteralmostequal in fen9th toScape,Se9ment 5weaklythickenedapicad,1.42timesaslongassegment4,se9ment6theIon9eSt, segment7slightlyshorterthantheprecedingsegment(segments10-11miSSin9inthe 1ectotype). pronotumdistinctlydivergent toapex,distinctlyconstrictedatapical Of u「thand ratherweaklysoatbasaleighth,PL/PAt43,PB/PA0.80,PL/PW1.05,PW/EW0.76, 432 TatsuvaNIIsATo - ‘ fi全器 器, ll;Io-on. 、 1・ ●Nagaoa1‘i. d - . r;・基益、,- 基・ , -一,」、1'if-、, -,,M _--? - ・、 Fi9.2. Stenho'nahls1ongicornls(BATES),combnov.,1ectotypefemale,depositedintheNaturalHistory Museum,London,withthelabelsattachedtothespecimen. PL/EL0.32;apexslightlyarcuateandnotbordere basegentlysinuate,verynarrowly bordered;sidessubpara11e1infront,moderatelyarcuatetoapical fourth,withlateraltu_ berclesstronglydilatedtomiddleandalmoststraightlynarrowedtobasal fifth,basal Colla「9entlynarrowedtobasalangles;discmoderatelyconvex,uneven,ratherweakly raisednearapical fourth,withapairofobliqueoblongswellingsnearmiddleanda medianindistinctonejustbehindmiddle,slightlyraisedatmiddleofbasalmargjn; Surfalcealmost impunctatethoughprovidedwithafewshallowpuncturesondorsum, Spa「SelyClothedwithlongpalefryinghairsmostlyonapicalhalf anddenselywjth Palerecumbentpubescence,whichisconspicuousatsidesandonimpressedpartsex_ CePt fordorsalswellings.Scutellumsmall,ratherelongatetrapeziform,almostsmooth andglabrous. ReviewofObt・ium1onglco1・no 433 b a c Fig. 3. Lateral view of meso-andmetathoracesinthefemale;Stenhomalus1ongtcornls(BATES), from Nagasaki,Japan(a),Sfenest1,atusWHITEfromTaiwan,typespeciesofthegenusStenhomalus(b), andObriumcanthariu1nshimo1nu・talTAKAKUwAfromHokkaido, typespeciesofthegenusOblium (C). Elytrafairlybroali,weaklyamplepostriad,EL/EW2.48;sideswithroundlyangu- latehumeri,straightlynarrowedtobasal5/12,andthenweaklydivergentandarcuate toapiceswhicharecompletelyrounded;discuniformlyweaklyconvex,almosteven, weaklyraisednearsuturejustbehindscutellum,ratherdenselyandsomewhatirregu- larlyprovidedwithmedium-sizedpunctures,thepuncturesshallowerandsparseron basal2/5,almostsmoothnearhumeriandapicalfifth,denselyclothedwithpaleyellow pubescenceandsparselywithshorthairsofthesamecolour. ventralsurfaceofthoracesalmostsmoothandthinlyhaired,partlyprovidedwith punctures;prosternumwithcoarsepuncturesnearmiddle,withpresternalprocessCOn- strjctedatbasal thir graduallydilatedtojustbehindmiddle,andthenstronglydilated apjcad;metasternumwithafewshallowindistinctpuncturesinmiddleofapicalhalf, wjthamedianfurrowextendingfromapicalmargintobasal fourth.AbdomenbroadL, somewhatlingulateindrycondition(apicalsegmentsreduced);sternite3(1invisible) verywjde,6川aslongasthebasalwidth,gentlynarrowedapica witha fewPunc- turesonposterjorparttomiddle,sternite4aml oststraightlynarrowedpost「lad,deeply arcuatelyemarginateatapicalmargin,providedwithdensefrin9esofIon9Paleo「an9e hajrsalongthearcuateljnejnmiddle,sternite5transverselytruncateatapicalma「9in; sternjte6deeplytriangularlyconcaveatapicalmargin,sternite7roundedatapical marginandpuncturedalongthemargin. Legsmoderatejnlength,stout;femoraslightlycompresseli,withhindpal「Weakly clavatejnapjca12/5;hindtibiaeweaklyarcuate,compressed;hindta「SiWith1stSo9- ment0.77timesaslongasthefollowingtwosegmentscombined・ Bodylength:5.3mm. specimenex::amined. 1 (1ectotype),“JapanG.Lewis1910-320”, “Na9aSaki”, “0br1umlongjcorneBat”,“Nag54346(undersideofmountingcard).”TheSpecimen examinedjsjnratheragoodconditionthoughtheapicaltwoSe9mentSofthen9htan- tennaandtheapicalthreesegmentsoftheleftantennaa「emiSSin9・ Djstribution. Kyushu(Nagasaki),Japan. 434 TatsuyaNIIsAT0 Notes. No additional recordof this obriinespecieshas beenavailable from Japananditsadjacentareas,andnocloserelativesofthespeciesareknownin the obriinefaunaofJapan. ItispossiblethatS.1ongicorniscomb nov mayhavebeende- scribedonaforeignspecimen fromsomewhereinEastAsia,butwecannotconfirm thematteruntiladditionalspecimensareobtained. Inmypresentopinion,S.1ongicornlsisprobablyclosesttoS.unicolorNllsAToet HuA,whichisquiterecentlydescribedfromEastChinaasarelativeofS.11ghti.How- ever,theChinesespeciesisclearlyseparablefromS.1ongicornlsbyitslongandrather slenderbody,moreapproximateeyes,strongconstrictionjustbeforeandbehindlateral tuberclesofthepronotum,andlongerelytra. 要 約 新里達也:ヒゲナガアメイロカミキリの分類学的再検討. - ヒケナガアメイロカミキリ 0brium1ongicorneBATESの基準標本系列 (ロンドン自然史博物館所蔵) を詳細に検討し, 本論 文において必要な分類学的処置を行った. 本種の基準標本系列には2種が含まれている. 1個体はBATES(1873)の原記載によく適合する 真のヒゲナガアメイロカミキリであり,ほかの2個体はトワダムモンメダカカミキリstenh0,na_ 1uslightiGREssITTであった. BATESは,記載作成に際して扱った3個体の標本のうち, 真の本種 を除く2個体を, 同一種の黒化個体とみなしたようである. 今回, 原記載によく適合する長崎 産の1個体を後基準標本に指定した. 一方, このヒゲナガアメイロカミキリが,実はメダカカミキリ属Stenhomalusに所属すべき ものであることが判明した. メダカカミキリ属は,他のアメイロカミキリ族の諸属から,長く 発達した後胸前側板や後胸前側板・後側板間の縦隆起の存在,前胸背板に密生する軟毛などに よって区別されるが, ヒゲナガアメイロカミキリの後基準標本は,それらの特徴をすべて備え, ムナミゾアメイロカミキリ属0briumの固有形質である後胸前側板・後側板間の深い縦溝を欠 いている. なお,和名は普及性を配慮し,旧来どおりの名称を残した. 本種にもっとも類緑が近いのは,中国東部から比較的最近に発見されたste,,homalus,,njc01o, NuSATOetHuAだと考えられる. この種は, トヮダムモンメダカカミキリとも近縁な種であるが, ヒゲナガアメイロカミキリとは,細長い体やより近接する複眼,前胸背板両側の中央隆起前後 の強いくびれ, より長い翅鞘などの特徴から容易に区別することができる. また,後基準標本 に付されたラベルによれば,本種の産地は「Nagasaki 長(山奇)」となっているが,日本国内はお ろか周辺地域からも, この種に該当するアメイロカミキリ族の種は,現在までのところ再発見 されていない. References BATES,H・W・,1873. Onthe1ongicornColeopteraofJapan. Ann.Mag nat.Hjst.,(4),12:1_3g GRESSITT,J・L.,1935. TheObriinioftheJapaneseEmpire(Coleopt.,cerambycidae) /ns ,natsu,ll,g 144-153. HAYASHI,M・,1954. Ce「ambycidae. 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J Fac.Ag''lc. Hokkaidoimp.Univ.,34:157-445十i-x,pls.1-5. MIToN0,T.,[1941]. Cerambycidae. Cat.Coleopt.Japon.,(94):l-227十1-56. NAKANE,T., l976. Cerambycidae26.ColeopteraofJapan(n.s)(29). Nat. &Ins.,「okyo,11(3):9-13. (InJapanese) NllsATo,T.,1991. TrueidentityofaJapanesespeciesofthegenusObrium(Coleoptera,Cerambycidae). Elyt,a,「okyo,19:158. - 1992. SubfamilyCerambycinae.InOHBAYAsHI,N.,M.SAT0&K.KOJIMA(eds),mustt:(:i1lide 1dentjfic.Longic.BeetlesJapan,pp.117-146,467-534.(InJapanese) _ & HuA, L.-Z.,1998. Threeadditional speciesofthetribeObriini (Coleoptera,Cerambycidae) fromChina. Etytra,To(kyo,26:451-460. _ & M. TAKAKuwA, lgg6. New recordof Obriumsemj1ormosanum(Coleoptera,Cerambycidae) fromnorthwesternKyushu,SouthwestJapan. Ibid,24:141-146. OHBAYAsHl,K.,1959. NewCerambycidaefromJapan.(5). Ent.Re、l.Japan,10:1-3. 1963. Cerambycidae.InNAKANE,T.,eta1.(eds),Iconog'aphiaInsectorumJaponlcorumColo'e' _ naturatiedita,2(Coleoptera):267-318,pls.134-159.(InJapanesewithLatinbooktitle) _ & N. 0HBAYAsH1, 1965. New formsofCerambycidae fromtheRyukyuS(ColeOpte「a). Bull. J,ap ent.Acad.,2(1): l-5. pfc,M.,1904. Descriptiond'unObriumduJaponetnotedechasse. Mat.Lo'lg.,5(1):22. sEKl,K.,1946. CatalogueoftheLongicorn-BeetlesofNewJapan.127pp.(InJapanese)