Two New Species of the Genus Megopis (Coleoptera, Cerambycidae) from Thailand and Vietnam, with Notes on Megopis pici LAMEERE and Megopis annamensis PIC

9 Pages·2000·9.3 MB·English

by  Komiya, Z

Elyt1a,「okvo,28(2):419-427,November15,2000
TwoNewSpeciesoftheGenusMegopzs(Coleoptera,Cerambycidae)
fromThailandandVietnam,withNotesonMeg〔)pispic1
LAMEEREandMegoplsannamensisPIc
Ziro KOMIYA
Shimouma3-2-14,Setagaya-ku,Tokyo,154-0002Japan
Abstract Two new cerambycid species allied to Megop1s (degoso,Ila) oi
LAMEEREare described from Indochinaunder thenamesM. (fl ) katsura1and M. (A)
cunei'col,nl's.TaxonomicnotesonM. (A)pici LAMEEREandM.(A)a'1'lame'1stsPICare
alsogiven.
TwonewspeciesofthecerambycidgenusMeg〔)pisarerecentlyfoundinThailand
andVietnam. Inthispaper, IamgoingtodescribethemunderthenamesM. (
ego-
soma) katsuraiandM. (A) cuneicornlsspp nov.Thesenewspeciesareconsideredto
bethemembersof thepicispecies-groupof thesubgenusAegosomain LAMEERE's
sense(1915a).Megopis(Aegosoma)annamensisPIc(1930)wasfound fromthesame
areaandprovedalsotobelongtothepicispecies-group.Adescriptionofthemaleof
M annamensiswillbegiven forthefirst time.IwillalsogiveashortnoteonM(A)
pjcjbasedonthematerialscollectedinthepastdecade,thoughtheydonotperfectly
accordwiththeoriginaldescription.
Beforegoingfurther,IwouldliketoexpressmysinceregratitudetoDr.Shun-Ichi
UENo of the National Science Museum (Nat.Hist), Tokyo, for kindly revisingmy
originalmanuscript.
Megopis(4egosoma) afsum'sp nov.
(Fig.1)
Amjddle-sizedspeciesofslightlydepressedandelongatedbody form. Integu-
mentchestnut_brown,eyesblack,clothedwithyellowhairsonhead,pronotumand
mostpartofventer.Femalesimilartomaleandseeminglymoredifficulttoobtain.
Headaboutaslongaswide,clothedwiththinbutdistinctyellowhairs;
Male
fronsconcaveatmjddle;vertexfinelypunctured,withshinymediangroove;eyesta「go,
thejnterspacebetweenthemobviouslyshorterthaneachuppereye1obe;antennaltu-
berclessmoothlybutstronglyraised;mandiblesabout0.37timesaston9ashead,
sharplycurvedinwards,finelygranulatedexceptoninnerblades,andacutelypointed
atapjces,eachmandiblewithaninternaldentatbasalquarterandanobtuseeXte「na1
420 ZiroKOMIYA
angleslightlybeyondthemiddle.
Antennaeshort,about0.81timesaslongasbody;segment1thick,stronglypunc-
tured;segment3slightlyarcuate, thinner thansegment1but thicker thansegment4,
3.3timesaslongassegment1;segments2-4strongly granulate segments3and4
providedwithlongitudinal innergroovesandalsowithindistinct longitudinaldepres-
sionsontheventralside,unitedlengthofsegments4-6slightlyshorterthansegment
3; segments5-10gradually decreasing inlengthandwidth,sparsely but distinctly
granulated,eachthickenedapicad.
Pronotumclothedwithyellowhairswhicharelongerandthicker thanthoseon
head,transverse,moderatelyconvex,withbasalandapicalanglesobtuse,widestatthe
base,parallel-sidedinbasalquarter,andthenstraightly.stronglynarrowedapica api-
calwidthaboutthesameasthemaximumwidthofhead.Scutellumlingulate,finely
punctured.
Elytraglabrous,finelypuncturedandgranulatedexceptoncostae,2.36timesas
longaswide,widestataboutmiddleandgraduallynarrowedtoroundapiceswhichare
provided with very small but distinct sutural teeth; lateral margins moderately
rounded;each・discfurnishedwithfourcostae,firstandsecondinternalcostaestarting
fromhumerus,thirdandfourthstartingoneaftertheother fromalittlebeforethemid_
dieonintervalsbetweenlateralmarginandthesecondcosta, fourcostaeconverging
anddisappearingneartheapex,typicalpatternofcostaeasshowninFig.1.
Ventralsurfacesmooth, finelypunctured,withthinandrather longpubescence;
legs long,slender, finelypuncturedandpartlyminutelygranulated; tarsalsegments
Slender,segment1longerthansegment3,segment2theshortest,segment3notso
stronglybroadenedasinmostspeciesofthesamegenus,clawsegmentslightlylonger
thanunitedlengthofthreetarsalsegments.
Bodylength:25.4-46.1mm.
Female. Similartothemaleingeneralappearance.Antennaeabout0.65tjmes
aston9asbody,segments5-10serrate segment1l somewhatrounded.Elytraabout
2.10timesaslongaswide.
Bodylength:33.1-34.8mm.
Typeseries. Holotype: Sapa, LaoCalProv.,northernVjetnam,13_vI~g_
,
VII-1994,N. KATSuRAleg.DepositedinthecollectionoftheNationalScienceMu_
seum(Nat.Hist),Tokyo.Paratypes:6 ,samedataastheholotype;7 ,same10_
cality,V-1994, 5 ,samelocality,vIl-1994,4 ,samelocality,vil_1gg5;3
2 ,Mt.PiaOac,CaoBangProv.,northernVietnam,IV-1995;2 Fang, chjang,
MalP「ov.,northernThailand,VII-1990&VI-1994;Nan,northernTh,ajland,2
3-VI-1994,K.Dotleg. ,
Distribution. NortheasternThailandandnorthernVietnam.
Notes. Megopis(Aegosoma)katsura1sp nov. isalliedtoM (A)pjcj,butcan
easilybedistinguished fromthelatterbyshorterantennae,differentratjoofantennal
So9mentS,withsegment3longitudinallygroovedinternally,andelytronwithfourdjs_
tinctcostae.
NewandLittle-knownMegopisfromIndochina 421
Fig.1 Megopis(Aegoso,na)katsu'a'tKoMIYA,spnov.,3
Megopis(Aegosoma)cuneicornissp nov.
(Fig2)
Amiddle-sizedspeciesofelongatedbody form.Bodychestnut-brown,closeto
M katsu1・alsp nov. ingeneralstructure, thoughalittleslendereranddarker.Female
unknown.
Male. Headabout 1.1timesas longaswide,with thin yellow pubescence;
fronssmooth,withadistinctcarinaateachside,whichisconnectedwitheachanten-
naltubercle,andconcavebetweenthetwocarinae;vertexstronglypunctured,witha
deepmediangroove;eyesbulging;antennal tubercleslarge,notacutebutmassively
422 Ziro Ko、,・llYA
Fig.2 Megop1_s(Aegoso川a)cll1le1co1・,ll.l,KoMIYA、sp nov..o
raised;mandiblesabout0.41timesaslongashead,sharplycurved,eachwithaninter-
naldentclosetothebaseandadistinctbutbluntdentatoralittlebeforethemiddleon
externalmargin.
Antennaeabout0.82timesaslongasbody;segment12.2timesaslongaswide,
obliquelytruncatedapicad,deeplypunctured;segment3thinnestataboutmiddleand
thickenedtowardseachapexwhichismuchthickerthanbase,withapairoflongitudi_
na1carinaerunningalongtheupperandlowersidesontheinner face,flatandshiny
betweenthecarinae,theotherpart finelygranulate withrather largegranulesalong
thecarinae;segment33.4timesaslongassegment1,unitedlengthofsegments4_6
aboutaslongassegment3,segments4-10graduallydiminishinganddecreasingin
NewandLittle-knownMegopistron、Indochina 423
1en9th,segment11aslongassegment5,acutelypointedapicad;segments4_10dis_
tinctlythickenedapicad.
Pronotumwiththickyellowhairs,slightlyconvex,transverse,aboutahalfaslong
aswide,widestat thebase,straightlynarrowedapicadandconstrictedjustbehind
apex.Scutellumlingulate,withlaterallinessinuate,thinlypubescent.
Elytraglabrous,finelygranulatedexceptoncostae,about2.56timesaslongas
wide,widestataboutbasalquarterandalmoststraightlynarrowedtoroundedapices,
withrathersmallsuturalteeth;eachelytronwith fourcostaewhichrunasshownin
Fig2;firstinternalcostanotjoiningsecondcostabutconnectedwithsuturalmarginat
about apical fourth,external twocostaemeetingwitheachotheranteriadandsepa-
ratelydisappearingapicad.
Prosternumandmetasternumwiththickhairs.Abdomenwithsparseshorthairs.
Legslong,slender,finelypuncturedandthinlypubescent.
Bodylength:31.5-36.5mm.
Typeseries. Holotype: MaeSot, westernThailan IX-1996(no further data
,
available).DepositedinthecollectionoftheNationalScienceMuseum(Nat. Hist),
Tokyo.Paratypes:3 ,samedataastheholotype;1 ,samelocality,3-IX-1997.
Distribution. WesternThailand.
Notes. Megopis(?tegosoma)cuneicornlssp nov.isalliedtoM katsu1・alsp
nov.,
butcaneasilybedistinguishedbythefollowingpoints:antennaslenderer,lessgranu-
lated,withsegment3 relatively longandstrongly thickenedbothbasadandapicad,
segments4-10eachstrongly thickenedapica withsegment 11 acutely pointedat
apex,pronotummorehairyandshorter,elytronwithinnermostcostajoiningnotwith
secondcostabutwithsuturalmargin.
Megopis(Aegosoma)an,ta,no,tsisPIc,1930
(Fig3)
Megoplsa,tna,no,IsisPIc,1930,Millexot.-ent.,(55),p.15.
Middle-sizedspecieswithcylindricalbody;verydistinctiveinhavingcompletely
edgedlateralmarginsofpronotumandinexhibitingprominentsexualdimorphism.
Male. Bodyblackishbrownwithcharcoalblackelytra.Headrobust,thinlypu-
bescent,slightly longer thanwide, roughly granulatedandpunctured, thepunctures
beingstrongeronvertex; fronto-clypea1suturedistinctlygrooved; interspacebetween
eyesaboutaslongaseacheye1obe;antennaltuberclesweaklyelevated,surroundedby
less-granulatedandshinyband.Mandiblesabout0.60timesaslongashea 1ongitudi-
nattygroovedontheunderside,eachwithabluntbutdistinctdentontheexternalside
andasmalldentontheinternalsideveryclosetothebase.
Antennaeabout0.92timesaslongasbody;segment1robust,segment3robust
but narrower thansegment 1,about3 timesas longassegment1, longer thanthe
unitedlengthofsegments4and5,segments1-4stronglygranulated,segments3and4
providedwithlongitudinaldepressionsontheunderside,segments4-10graduallyde-
424 Ziro KoM1、A
Fig. 3 Megopls(Aegoso,na)anname,IsisPIc, fromMt.BaoLoc,southernVietnam
,
creasinginlengthandwidthandsegments5-10depresse(i,sparselygranulatedandan-
gulatedattheinnersideofeachapex,segment11shorterthansegment5,longerthan
segment6andslightlyhooked.
Pronotumclothedwithsparseandratherlongyellowishwhitehairs,widestatthe
base,sinuatelynarrowedapica(i,constrictedatashortdistancefrombaseandslightly
behindapex,withlateralmarginsdistinctlyedge basalandapicalanglesprominent.
Scutellumlingulate,withyellowishwhitehairs.
Elytraglabrousexceptat theextremebaseswhicharefurnishedwithyellowish
whitehairs,finelygranulatedthroughoutexceptoncostae,about2.32timesaslongas
wide,not reachingtheapexofabdomen,widestjustafterhumeri,almoststraightly
NewandLittle-knownMegoptsfromIndochina 425
narrowedtoapicaltwo-fifths,thenmorestronglynarrowedposteriadandcontractedly
roundedapicad,withsmallsuturalteeth,whicharesometimes lacking;eachelytron
with two distinct internal costaeand two feebleexternal costae, typical pattern of
costaeasshowninFig 3.
Ventralsurfacewithwhitishgraytomentumwhichisthickenedonprosternum,
metasternum,coxaeandtrochanters.
Legsstout; forelegsrobust,coarselygranulated;middleandhindlegsslender
andfinely granulated; tarsalsegmentsbroa withsegments3roundedapically,claw
segmentsshorterthanunitedlengthofsegments1-3.
Bodylength:26.0-32.8mm.
Female. Agreeingwith theoriginal description.Color chestnut-brown.Fore
legsandantennaenormal,notmodifiedasinmale.Notsimilar ingeneralappearance
tothemaleofthesamespecies,butsomehowsimilartothefemaleofM.plciortothe
maleofM katsu,alspnov.Headnotrobustasinmale;mandibleswithexternaldents
notsodistinct,antennaeslender,about0.70timesaslongasbody,weaklygranulated,
slightlydepressed.
Pronotumwithlateralmarginsstronglyedgedthroughout.
Elytraglabrous, finely granulateli,subpara11e1-sidedatbasal three-fourthsand
thennarrowedapicad,eachwithfourdistinctcostaewhicharestrongerthaninmale
andhavingapatternmoresimilartothoseofM katsura1sp nov thanto thoseof the
maleofMannamensis(seeFigs.1and3).
Legsslender,withoutgranules;forelegsnotrobustandalmostofsimilarappear-
ancetomiddleandhindlegs.
Bodylength:31.6-34.5mm.
specjmenseMmlned. 1 , 1 Mt.BaoLoc,southernVietnum,29~30-Vill-
,
i998,M.ITCHleg;5 ,2 ,samelocality,29-VIII-1999.
Thisspeciescanbedistinguishedfromalltheotherknownspeciesofthe
Notes.
subgenusAegosomabyhavinggroovedfronto-clypea1suture,distinctpronota1ma「9inS
andprominentstructuraldifferencesbetweenmaleandfemale.
Megop1is(Aegosoma)piciLAMEERE,1915
(Fig4)
MegopjspiciLAMEERE,1915,Bull.Soc.ent.F「anCe,1915:178・
Megop1's iel:GREsslTT,1951,Longicomia,2:16.
Megop1s'p1'cj:HuA,1982,CheckListofLongicomBeetlesofChina,P・3・
Thisspecieswasdescribedonapairofthespecmi ensfromYunnan,China,and
sincethen,noaddjtjona1recordhasbeenreported. Intherecenttenyears,SeVe「al
specmi enswerebroughtaboutfromtheareacolsetotheoriginallocality.These「eCent
materjalsaml ostagreewjththeoriginaldescriptionofM.pici,thoughtheyhaveSome
differentcharacteristicsasgivenbelow.
Eachmandjblewjthadistinctinternaldent,smoothlyCu「VedeXte「natty・
Male
426 Ziro KOMIYA
Fig. 4 Megopls(degoso,na) lotLAMEERE, fromDaju,Yunnan,China
,
Antennaeabout1.16timesaslongasbody,segment1entirely glabrous,segment3
withalongitudinal depressionon theunderside,segments 4-11slightly depressed
dorso-ventra11y.Elytraalmostblack,notmarginedwithdarklines,withfeebleimpres-
sionofexternalcostaearoundapical two-thirds.
Undersideclothedwiththickwhitishgraytomentum,whichissodensethat the
metasternalstructuresareinvisibleundersuperficialobservation.
Bodylength:28.0-33.5mm.
Female. Antennaabout0.68timesaslongasbody,slightlydepressed.SimiJar
ingeneralappearancetothefemaleofMannamensisortothemaleofMkatsura1sp
nov.
Bodylength:33.0mm.
NewandLittle-knownMegopisfromIndochina 427
Specimensexamined. l ,Daju,Yunnan,China,24~28-VI-1992,2 , same
locality,VI-1994,1 ,samelocality,7~8-III-1995,E.KUcERAleg.
z Additional Notes. Megopfs afsteMa s nov and M. cu ezcormssp nov areob-
viouslyclosetoeachotherandclosest toM pici,but theyshareseveral important
characteristicswiththegiganteaspecies-groupofMegopis.
LAMEERE(1g15b) also describedMegopls (Aegosoma) guerryi fromYunnan,
ChinaasaspeciesofthesamegroupasM. plci. Megopiskatsuraisp nov and M.
novarenotcomparedindetailwithMguerry1,becauseinmyview,
cunejcornlssp
Mguerryidoesnotbelongtothesamespecies-groupduetothepubescentelytraand
hairedantennae.
要 約
小宮次郎:タイおよびウ、ェトナムから発見されたMegopis属の2新種, ならびに同属2種の再
記載. _ 近年タイおよびヴェトナムからMegopis属の新種が発見されたので, M. (Aegosoma)
katsu,・a,spnov.と命名して記載した.雄触角第3節の内側に縦の溝があり, Aegosoma亜属の
sinica種群およびgigantea種群のものに似てぃるが,雄触角は体長の0.8倍で,同亜属の他の種
の場合に比較してはるかに短い. またタイ西部より近似の別の1新種が得られ, M.(A)cune,-
cornisspnov.として同時に記載した.前種によく似てぃるが,頭部が細長く,前胸背板は短く,
雄の触角は3, 4節の中央部が細く, それぞれの先端部がくさび状に太まるため,容易に区別で
きる. Megopis(A)annamensisは, pieにより1雌に基づいて1930年に記載され,以後報告がな
かった. この種の雄が発見されたので,新たに記載した.雄は体が炭黒色で触角第3節および
前腿節が非常に太く,雌と大きく違う.またこの種は前胸背板の側緑が明瞭に角張るなど際立
った特徴をもつ.Megopis(A)piciは, LAMEEREによって1915年に記載されて以来新しい記録や
追加的特徴の報告はないが,近年数個体が得られている. これら最近得られた個体はM.Piciと
同一種と考えられるが,雄の触角が体長の1.2倍近くあり,上翅が黒いなど,体長と触角が等
しく上翅が褐色で黒く縁取られるとした原記載に合わないので,近年得られた個体の特徴を記
載し,今後の検討に資する. LAMEEREが同じグループのものとしたM.(A)gtterryiLAMEERE,
1g15は,本文の中で詳細に比較しなかった.この種は上翅と触角が毛に覆われるとされ,別の
グループに所属すると考えられる.
References
GREss1TT,J.L.,1951. LongicombeetlesofChina. Longicot'nla,2: l-667,22PIS・
AcheckLjstoftheLongicornBeetlesofChina(CoelOpte「a,Ce「ambyCidae)・185PP・
HuA L _z ig82.
zhongshanUniv.,Guangzhou.
LAMEERE,A,1g15a NotessurunprioninaenouveauduYunnan(Col.Ceramb). Bul・l SOC・ent・F「,
1915:178-179.
_ 1gl5b Descrjpljond'unnouveauPrioninae(Col.Ceramb). Ibid.,1915:324-325・
pfc M ig30. Nouveautesdiverses. Maexot.-ent.,Moulins,(55):1-36・