Two New Tenebrionid Species (Coleoptera, Tenebrionidae) from Japan

5 Pages·1991·3.1 MB·

by  Masumoto, K

Elytra,Tolkyo,19(1):25-29,May15,1gg1
TwoNewTenebrionidSpecies(Coleoptera,
Tenebrionidae) fromJapan
Kimio MAsUMoT0
LaboratoryofEntomology,TokyoUniversityofAgriculture,
Sakuragaoka1-1-1,Setagaya-ku,Tokyo,156Japan
Abstract TwonewtenebrionidbeetlesaredescribedunderthenamesofP/atyde,na
sail'ada1'sp nov.(tribeDiaperini),and rac ﾍyldl川M lwoJl171oesp nov. (tribeOpatrjnj).
TheformerwascapturedonlshigakijimaIs.,RyukyuIslands,SouthwestJapan,and
thelatterwasonIwojimaIs.,VolcanoIslands,atthenorthernpartofMicronesja.
In this paper, two new species of tenebrionidbeetles, P/atydema sawada1sp.
nov. (tribe Diaperini), and Brach、,idium lHo11maesp nov. (tribeOpatrini), will be
describedfromJapan.
Theauthor wishes toexpresshissinceregratitude to Dr. Otto MERKL, Ter-
meszettudomanyi Muzeum,Budapest,forloaningmaterialsofrelatedspeciesjncludjng
aparatypeofCaediuspalaue'IsisKuLzERpreservedintheMuzeum and also to Mr
HiroshiSAwADA,Tokyo, forprovidingwithspecimenstobedescribed.
Theho1otypesof thenewspeciesaredepositedinthecollectionof theNatjona1
ScienceMuseum(Nat. Hist), Tokyo.
Plalydemasawadaisp
nov
(Fig. 1)
Yellowish brown, with basal half of pronotum except for lateral and basal
margins,postero-1atera1portionsofelytraexcept for lateralandapicalportionsob-
viouslydarker;dorsalsurfaceratherstronglyshining,ventralonedullyso. Oblong-
ovalandstronglyconvexabove.
Male. Headsemicircular,distinctlydepressedinanX-shapeinmiddle,minutely
punctate,armedwithapairofsubconica1hornsclosetoeyes,whichareleant forwards;
clypeustransverselyoblongandconvexabove,denselypunctate,withapexmoderately
arcuate; genae oblique, withouter margin feebly produced; eyes large,somewhat
transverselyreniform;diatoneabout0.8timestransversediameterofaneye;mentum
subcordate with basebriefly truncate, convex inmiddleand distinctlydepressed in
lateralportions; gulatriangular andborderedbyfineimpressions;terminalsegment
ofmaxillarypalpusfairlylargethoughgentlythickenedtowardsapex,whichisoblique-
lytruncate. Antennaesubclavate, reachingbaseofelytra, ratioofthelengthofeach
segment from basal to apical as follows: 0.7, 0.2, 0.45, 0.55, 0.5, 0.4, 0.45, 0.4, 0.4,
0.4_0.7.
26 Kimio MAsUMoT0
pronotumsubtrapezoida1,abouttwiceaswideaslong,widestatbaseand9「ad-
ua11ynarrowedtowardsapex;apexnearlystraight,finelybordered;basebSiinuOuS,
wjth a short obliqueimpression on each side; sides steeply declined to late「al
margjns, whjch are more distinctly bordered than apex; front an9leS obtuse,
eachwjthroundedcorner;hjndanglessubrectangular;discratherstrongly,t「anSVe「Se-
1yconvex,minutelypunctate,thepuncturesalittlesparserthanthoseinlate「alPO「一
1jons. Scutellum short linguiform, sparsely scattered with microscopic PunCtu「oS・
Elytraabout 13 timesas longaswide, 3times lengthand12 times Width of
pronotum,wjdestalittlebeforethemiddle,graduallynarrowedtowardsbasesand
apices; dorsumstronglyconvex, thickest alittlebefore themiddle; disc PunCtato-
strjate, thepuncturesinstriae fairlyclear, distancebetween them about 1-2 times
thejr owndiameter; intervalsgentlyconvexon thedisc, fairlyconvexat theSide,
wjthrowsof finepunctures,whicharemuchsmallerthanthoseonpronotum;Sides
steeplydecljnedtolateralmargins,whicharedistinctlyborderedandfeeblyeXPlanate
laterad,henceeasilyvisiblefromabove.
prosternumrathershortandridgedmedially, apicalmarginwidelyema「ginate,
rjmmed jnmedja1half, with presternal processsubfusiformandprojected to「ea「;
mesosternum very short, deeplyexcavated posteriorly, with posterior edgeof the
excavation nely ridged; metasternum medium-sized, shallowly wrinkled and Scat-
teredwithpunctures,whichbecomecoarserandsparser inlateralportions,witha
clearmedianimpressioninposteriorhalf.
Abdomen alutaceous and scattered with punctures, which become larger and
coarser inlateralpartsandminuteintheapical.
Legssimpleinshapeandmedium-sized;ratioof thelengthsofpro-,meSo-and
metatarsomeres from basal to apical: 0.35, 0.25, 0.25, 0.25, 0.8; 0.6, 0.3, 0.25, 0.2,
0.75;0.95, 0.45,0.3,0.95, respectively.
Malegenitaliasomewhatelongatedfusiform.
Figs. 1-4. - 1. Platydemast-ada1sp nov., o, holotype. - 2.Brae・/lyidiumtH'ojimaesp.
nov., l、o1otype. - 3. B re(・langu/u111(GEBIEN), , - 4.B.palauense (KULzER),
, ,
paratype.
TwoNewTenebrionidsfromJapan 27
Female. Headwithneitherhornsnordepressions;dorsalsurfacemoredistinctly
punctate.
Body length: ca 4mm.
Type series. Holotype. , Mt. Banna, Ishigakijima Is., Ryukyu Islands,
Japan,29-X-1990, K.SAwADAleg. Paratypes 9exs.,samedataasfor theholotype.
Notes. Thisnewspeciesmaybeeasilydistinguishedfromotherspeciesdescribed
fromneighbouringareasinEastAsiabythemaleheadarmedwithtwosymmetrically
formedhornsandthepronota1andelytralcoloration.
BrachyidMmiwof'imaesp nov
(Figs 2,5,8)
Brownishblack,withmouthparts,gula,claws,etc.,moreorlesslighterincolour;
eachsurfacegentlyclothed with veryshort paleyellowishhairs, dorsalsurface feebly
sericeously shining, ventral one gently shining. Oblong-oval, moderately
convex
above.
Male. Head somewhat transversehexagonal, gently declined to apex, weakly
rugose-punctate and asperate; apical margin of clypeus indented at the middle,
roundedoneachside;outermarginofgenaobliquelyarcuate;eyesrathersmallwhen
seen from above; interocular space wide and about 6 times transversediameter of
aneye, witha rounded ridgepartially overlyingeacheye. Mentum subpentagona1
and coarsely asperate, withapex roundly pointed; gula triangular and feebly alu-
taceous,withashortimpressioninanterior portiononeachside;terminalsegmentof
maxillary palpus rather short and securiform. Antennae reaching the middle of
pronotum; ratioof the lengthofeachsegment frombasal to apical as follows: 0.7,
0.22, 0.7,0.3,03, 0.3, 0.35, 035, 0.35, 0.3, 027.
. . .
Pronotumabouttwiceaswideaslong,widestatbasethoughalmostsubparallel-
sided in basal half, then roundly narrowed towards apex; apex gently andwidely
emarginate,finelyrimmedineachlateral1/3;basewidelybisinuate,finely impressed
alongmargin, the impression interrupted inmedial 1/5; sides graduallydeclined to
lateral margins, whicharemoredistinctly rimmed thanapex; front angles obtuse,
hindonesalittleacuteandpointedpostero-laterad;disctransverselyandgentlyconvex
andmoreorlessmicro-shagreened,closelythoughweakly rugose-punctate, the ru-
gositymostly formingshort longitudinal ridges, witha faint impressionat baseon
each side. Scutellum semicircular andsmooth, thoughmostly hidden beneath the
pronotum or itsfringinghairs.
Elytraalittlemore than t 3 timesas longaswide, about 2.8 times lengthand
1.1 timeswidthof pronotum, widest at themiddle though thebasal half isalmost
subpara1lel,roundlynarrowedinapicalhalf;dorsummoderatelyconvex,often faintly
depressed behindscutellum, thickest a little before themiddle; disc feebly micro-
shagreened, weakly punctate-striate though the punctures are often indistinct; in-
tervals feebly with sutural intervals mostly ridge-like, granulate and micro-
c onvex
28 Kimio MAsUMoT0
5 7
、、
Figs 5-10. - 5-7. Male protibiae in
ventral view;5,B.ill,oJ1/11aesp nov;6,
B re(1angulum(GEBIEN);7,B.palauense
(KULzER). - 8-10. Malegenitalia in
dorsalview; 8,B. tu,ojimaesp nov;9,
8 9 B.l・e(・tangu/tan(GEBIEN);10,B.palauense
10 (KULZER).
scopica11yhaired, thehairsbeingscale-likeonthediscbutbecominglongerinlateral
portions;sides rather steeply declined tolateral margins, which envelop the hind
bodyand are finely rimmed, therimsbeingmicroscopicallyserrateand fringedwith
hairs.
Prosternum coarsely asperate, apical margin barely bordered, with presternal
process fairly largeandobtuselyproducedposteriad; mesosternumextremelyshort,
withatriangularexcavationat posteriormargin;metasternummedium-sized,coarse-
lypunctateandshortlyhaired,withamedianlineinposterior i/3. Abdomenasperate,
clothed withshort bent hairs.
Protibiagently curved inwards, rather distinctlywidened to apex, which issub-
truncate, outermargin withalargetoothinmiddle, andalsowitha fewsmall ones
inbasal2/5(seeFig 5);ratioofthelengthofpro-,meso- and metatarsomeres from
basal to apical: 0.4, 0.25, 0.26, 0.28, 1.2; 0.7, 0.32, 0.36, 0.34, 1.22;1.27, 0.55, 0.38,
128.
.
Malegenitaliasubfusiform, withlateral lobesweaklyprolonged.
Female. Protibiawider thaninmalethoughlessdistinctlycurved.
Bodylength 7.5-85mm.
.
TJ,pcseries. Holotype. , Iwojimals., Volcano Islands, Japan, 30-IX-1990,
TwoNewTenebrionidsfromJapan 29
K.MAsuMoToleg. Paratypes. ll6exs.,samedataasfortheholotype;5exs.,Iwojima
Is.,17-X-1989, K. MAsUMoTo leg.
Notes. Thisnewspeciesresembles Brachyidiumrectangu/um (GEBIEN), original-
lydescribedfromthePhilippines,butcanbedistinguishedfromthelatterbythedorsal
surfacemoredistinctly asperateandmoredenselyclothedwith finehairs, thepro-
notum withmoreremarkablyangulate front angles; theelytralessclearlypunctate-
striate, and thedifferentlyshapedprotibiaeand genitaliain themale. From B. pa-
1auense(KuLzER), whose locality isnot far from Iwojimals.,thenewspeciescan be
easilydiscriminatedbythelargerandsubpara1le1-sidedbody, thedorsalsurfacemore
distinctlygranulateandhaired, anddifferentlyshapedprotibiaeandgenitaliain the
male.
要 約
: l 益本仁1xa 日 本産ゴミ ฀シタマシ(cid:18174)2 新種 .ー八重山タul島石」日島で沢Ill和宏氏により来i 集された,
小型で限間に1対の短角のあるキノコゴ、ムシタ'マシを新種と認め, Platydema sawadai SP nov.
として記載した. また, 火山列島硫黄島で著者が採集したニセマルチヒゴミムシタマシは, フィリピ
ンに産するBrachyidiumrectangulum(GEBIEN)に近似するが, 表面構造や前111?0背板, 前 節, o交
尾器などの形状で区別できること, さらに地域的にみて近いパラオ島から記載されたCaediusPalau-
ensisKuLzER=Brachyidiumpatauense(KuLzER) とは一見して分けられることから, Brachyidium
iwoJlmae sp nov. として新極記成, した.
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