Two New Larhodius (Coleoptera, Scarabaeidae, Dichotomini) from the Malay Peninsula

5 Pages·2003·3 MB·

by  Masumoto, K

E、l t・,a,「ok、、・o,31(2):379-383,November22,2003
TwoNewLarhodzus(Coleoptera,Scarabaeidae,Dichotomini)
fromtheMalayPeninsula
KimioMAsUMoT0 and YukaUTSUNOMIYA
InstituteofHumanLivingSciences,0tsumaWomen'sUniversity,
Tokyo,102-8357Japan
Abstract Two new speciesof thescarabaeidgenusLa1・/1odius(tribeDichoto-
mini),L tna1・1、a1na1sp novandL./1as/ilmtsp novaredescribedfromtheMalayPenin-
sula. La,・hodiusisherewithraisedtothegenericrank.
Twospeciesofverysmallscarabaeidbeetleswithverystrange facieswerecol-
lectedbyMunetoshiMARUYAMA,ayoungentomologistspecializedinmymecophi1ous
beetles,byFIT(flightinterceptiontrap)intheMalayPeninsula.Hepassedthemtous
for detailedstudy.At the firstglance, it wasnoticedthat they belongto thegenus
Haroldiusinabroadsense,thoughverypeculiarinthebodyoutline.Becauseofsuch
characteristicsastheroundedclypeus,strangelyshapedlegs,andsoon,theywerecon-
sidered tobelong to thesubgenus La1,hodiusBAt_THAsAR, 1963,whichwas known
fromonlyasinglespecies.
Wehaveexamined thetypespeciesandthepresentmaterial offered tousby
MARUYAMA,andhaveconcludedthatthelattercontainstwonewspecies. Inaddition
wehavecometo theconclusion thatthesubgenus Larhodiusshouldberaisedto the
genericrank.
Beforegoing further intodetails,wethank Dr. Munetoshi MARUYAMA, theNa-
tionalScienceMuseum(Nat.Hist),Tokyo, forgivingustheopportunitytoexamine
veryinterestingbeetles.WealsothankDr.MakotoKIucHI,TsukubaCity, fortaking
photographsinsertedinthispaper.Finally,weappreciateDr.Shun-lobiUENo,Emeri-
tus Curator of the National Science Museum (Nat. Hist), Tokyo, for assistingour
studyinvariousways.
Genus Lar11odiusBALTHAsAR
Ha・loldjltssubgen.La,・1/odiusBA--lAsAR,1963,Mon.Scarab.Ap、iod.Palaearkt.0rient.Rcg.,1:246.Type
species:ila・,cit/111.1・ca/calatusJANssENs,l934(=La1'hodiused/ca''atuscombnov).
AccordingtoBALTHAsAR(1963),thesubgenusLarhodiusischaracterizedbythe
following points: 1) clypeus not notched at the centre but widely, continuously
rounded,withtheanteriorpartweaklyreflexed,2)elytra1striaepunctate,intervalsnot
380 KimioMAsUMoToandYukaUTsUNoMIYA
punctateandglabrous, 3) protibiaenotbidentatebut quadridentate,andmeso- and
metatibiaeeachwithalongapicalspur,whichisalmostaslongasthelengthofre-
spectivetarsi,4)1stmeso-andmetatarsomereseachbearingaspuralmostofthesame
lengthasthetotallengthofeachsegment,5)mesosternumnearlystraightlydefined
frommetasternum.
Wehave confirmed the following characterscommon to themembersof this
group:apicalmarginofheadcontinuouslyrounded,apicalspursofmeso-andmetatib-
iaelong,andmeso-andmetasternaIbordersnearlystraight,intervalsminutelypunc-
tateandprotibiawiththreeto fourouterteeth.
InHaroldius,thebody ishemispherical, theanteriormarginoftheheadwidely
incisedatthemiddle,witheachsideoftheincisionproduced,theprotibiawiththe
outermarginbidentate,themeso-andmetatibiaewithoutlongterminalspurs,andthe
bordersofmeso-andmetasternastronglycurved.
Larhodiuscanbeeasilydistinguishablefrom ila,,oldiusbythecharacteristicsno-
ticedabove.WearethereforegoingtoraiseLa1hodiustothegenericrank forreasons
ofpossessingsuchpeculiarcharacteristics.
Larhodiusmaruyamal'sp
nov.
(Fig.1)
Bodyblackishbrown,withoutermarginsdarkerincolour,hairsonantennalclubs
paleyellow,hairsonlegsorange;rectangularlyovalandstronglyconvexdorsad;al-
mostglabrous.
Head broad, re exed along anterior margin, which is widely, continuously
roundedand fringedwithshortsetae;clypeusminutelypunctate,notclearlydefined
fromgenaeand frons;genae(ocular lobes) finelypunctate,subrectangular at lateral
corners,withpost-lateralmargins(oppositetoantero-1atera1marginsofpronotum) fee-
blysinuate; fronsweaklyconvex,moderatelypunctate,thepuncturesminuteinante-
riorpart,becominglargerposteria somewhatocellatedinposteriorpart.Eyesrather
crescent-shapedindorsalview.
Pronotumsomewhattrapezoidal,1.33timesaswideaslong,gentlynarrowedan-
teriad;apexwidelyemarginate,veryslightlyproducedinmiddle;sidesrathersteeply
declined to lateralmargins, whicharedistinctly bordered throughout, slightly ex-
planatelateradinmiddle; frontanglesubrectangularwitharoundedcorner,hindangle
obtusethoughthecorner isrounded;basevery widely rounde not rimmed, witha
rowofpuncturesalongmargininlateralparts;discstronglyraisedinmajorpostero-
centra1 part, wholly covered withmicroscopic punctures, also covered with larger
punctures,whicharesmallinbasalandcentralparts,becomelargerinanteriorandlat-
eralparts,andbecomeovateandocellatedinlateralparts;antero-interiorpartsofpro-
thorax hollowedbeneath.
Elytrasomewhatsemicircular indorsalview;basewidely,roundlyemarginatein
dorsal view;disc withsevenstriae,whicharesuper?olaf butevenly impressed, the
TwoNewLarhodlusfromtheMalayPeninsula 381
puncturesinthestriaenotchingintervals;intervalsalmost flat,minutelypunctate;lat-
eralmarginsfeeblyexplanateandfinelyrimmed.
Pygidiumgentlyconvex,scatteredwithmicroscopicpunctures,withapicalmar-
ginborderedbyarim, which isgently widened inmedialpart. Mesosternum short,
ratherclosely,shallowlypunctate,nearlystraightlydefinedfrommetasternumbyafine
groove;metasternumbroa smoothbutsparselymicroscopically punctateinmedial
part,relativelycloselyandcoarselypunctateinlateralparts;abdomenrathershort,3rd
to5thvisiblesegmentseachwithatransverserowofpunctures,eachbearinganad-
pressedseta.
Legsflattenedandwide;protrochantersharplypointedattheantero-externa1cor-
ner;protibiatridentatewiththeextremitybearingaboldspurdirectedantero-exteria
interiormargingently lobednearbase; protarsusshort andnarrow;mesotibiagently
narrowedapicad, with twoapical spursat theextremity, theupper oneofwhich is
longer andbolder than the lower,slightlyshorter than thetotal lengthofmesotar-
someres,andalsowithshortandboldspinesinlateralpartsoftheextremity;mesotar-
suswith1stto3rdsegmentsbearingsetaeonouterandinnersidesofeachapex,the
setaealittlelonger thanthelengthof thenext tarsomere;4thmesotarsomererather
small; ventralsurfacesofmeso-andmetatibiaeeachwith aramp creased obliquely
posteria thoughuneveninproximalpart;metatibiagentlynarrowedapica with a
1 2
Fjgs. 1_2. HabitusofLarhodiusspp. - 1,L mat・uvamaispnov.,holotype, ;2,L hashimisp nov.,
holotype,
.
382 KimioMAsUMoToand YukaUTsUNoMIYA
boldapicalspurattheextremity,whichisalmostaslongasthefourmetatarsomeres
combine andalso with short and bold spines in lateral parts of theextremity;
metatarsuswithapicalpartsof1stto3rdsegmentsbearingsetaeoneachside;claws
small.
Bodylength:5.3-5.4mm.
Holotype: e,UluGombak(byFIT),Selangor,Malaysia,27-II~5-III-2003,M.
MARUYAMA leg. (NSMT).Paratype: 1ex.,samedataas for theholotype; 2 exs.
,
21-V~3-VI-2003,thesamelocalityandcollectoras fortheholotype.
Notes. This new species resembles Larhodius calca;・atus (JANssENs, 1934),
originallydescribed fromBarway, India,butcanbedistinguished fromthelatter by
muchlargersize(2.5mminL.calcalatus)andslightlyelongatebody,withtheprono-
tummoredenselypunctate,theelytra1striaemoredenselypunctate,theprotibiaebear-
ingthreeouterteeth(four teethinL.calcaratus),andthefirst tothirdsegmentsofthe
meso-andmetatarsiwithsetaeinthelateralpartsofeachapex.
Larhodiushashimisp
nov.
(Fig2)
This newspeciessomewhat resembles thepreceding,butcanbedistinguished
fromthelatterbythefollowingcharacteristics:
Bodymuchsmaller(3.0-3.7mm),darkreddishbrown,withheadexcept forbasal
part of dorsal side, abdomen, pygidiumand legs lighter in colour; antennal clubs
clothedwithshortpalehairs.
Headlessstronglyproducedlatera with a low curve transverseridgeinmid-
dle,morenoticeably punctate.Pronotumslightly longer,1.35timesaswideas long,
morecloselyandclearlypunctate; frontanglesmorestronglyproducedanteriadand
angulate,hindanglesobtuselyangulate;lateralmarginsnotexplanatebutsimplyand
finelyrimmed;basefinelyrimme witharowofsmallpuncturesalongtherim.Elytra
punctate-striate,thepuncturesmoresparselysetandmoreweaklynotchingintervals;
intervalsfeeblyconvex,relativelycloselypunctate,thepuncturesslightlylarger.
Pygidiummoreclearlypunctate.Meso-andmetasterna1ongitudina11yconvex in
middle.Abdomensomewhatalutaceous,morecoarselypunctate,lateralpartsof2rdto
4thvisiblesterniteseachwithatransverserowofpuncturesbearingadpressedscales.
Protrochanterslessacute;protibiatridentate,interiormarginlessstronglylobed.
Holotype: ,UluGombak(byFIT),Selangor,Malaysia,27-II~5-III-2003,M.
MARUYAMA leg. (NSMT).Paratypes:10exs.,samedataas for theholotype;15exs.,
21-V~3-VI-2003,samelocalityandsamecollectorasfortheholotype.
Notes. ThespecificnameisgivenafterProf.RosliHAsHIM,InstiしtlteofBiologi-
calScience,UniversityofMalaya,whogaveMARUYAMApermissionof researchand
supportedhiminvariousways.
TwoNewLa1・1/odiusfromtheMalayPeninsula 383
要 約
益本仁雄・宇都宮由佳:マレー半島産La・,hodius属(Dichotomini)の2新種. - 国立科学博
物館の丸山宗利博士が, マレー半島でFITによって採集した小型で半球形のコガネムシを検討
したところ, コガネムシ科Dichotomini族のHaroldius属La,hodius亜属に属する新種であること
がわかった. また, Larhodiusは, ila・,oldiusと比較して顕著な特徴をもっているため, 属に昇
格させるべきであるという結論になった. 新種名は, 採集者, および採集者に協力を情しまな
かったマラヤ大学のRosliHAsHIM教授にちなんで, Larhodiusmaruya,naispnov.およびL.1/ashimi
spnov.と命名した.
References
BALTHAsAR,、f,1963. MonographiederScarabaeidaeundAphodiidaederpalaearktischenundorientali-
schenRegion,Coleoptera:Lame11icornia, Band1 392pp.24pls.TschechoslowakischenAkademie
derWissenschaften,Prag.
JANssENs,A.,1934. Descriptiond'unHa・toldiusnouveau(ColeoptereScarabaeidae). Bull. Ann1.s.Soc.
ent.Belg.,74:33-34.
PAULIAN,R.,1985. NotessurlesColeopteresScarabaeidaeduMuseumdeGeneve.11. Rev.sutsseZoo1.,
92:189-203.
Elyt1a,Totk、,o,31(2):383-384,November22,2003
TenebrionidBeetles(Coleoptera) fromthePalauIslands
CollectedbyKeiichi TAKAHAsHI(1)
Kimio MAsUMoT0
InstituteofHumanLivingSciences,0tsumaWomen'sUniversity,Tokyo,102-8357Japan
KeiichiTAKAHAsHl,oneofmyfriendsinentomology,hasbeenenergeticallycollectingin-
sectsinthePalauIslandsforthesetwoyears.Hehasbeengivingmeopportunitiesofstudying
tenebrionidbeetlesfromtheseislands.
KuLzER(1957)recordedthirty-fivetenebrionidspeciesfromthePalauIslands,whichare
mostlyseasideinhabitants.Iwasthereforesurprisedtofindsuchsylvico1ousspeciesinTAKA-
HAsH1s' materialasAmarygmusandaSt,,ongylium,particularlythelatterisknownforthefirst
time fromthePalauIslands.
Asthefirstpartofthisstudy,Iamgoingtoenumeratepreviouslydescribedspecies.
DiphylrhynchuscarolinensisBLAIR,1940:SonsorolIs.