Table Of ContentE:1yt1-a,「o(k、,o,27(1):97-101、May15,1999
ANewSpeciesoftheGenusPh1oeotrya(Coleoptera,
Melandryidae) fromCentralJapan
Ryoji TOYOSHIMA
4-11,Shimoiida-cho,Kita-ku,Nagoya,462-0865Japan
Abstract AnewspeciesofthemclandryidgenusP1/1oeotryaisdescribedfrom
themonlanezoneofcentralHonshu,Japan,underthenameoff;)1shikawa1sp nov. It is
relatedtoRsubtilisREITTER,butdiffersinsomepeculiaritiesoftheprothorax.
Inthespringof1992,thepresentauthormadeashorttriptoSugadaira(ca.1,100
inalt), themontaneareaofthenortheasternpartofNaganoPrefecture,andcol-
m
lecteddeadtwigsofF1・a:x:inusmandshu1・icavar.Japonicaattackedbylarvaeofseveral
coleopteranspecies.FromthelastdecadeofMaythroughJuneofthesameyear,some
adultsofastrangespeciesofthegenusPh1oeotryawereemerged fromthesetwigsto-
getherwithmanyadultsofthecerambycidbeetle,0briumJaponlcumPlc.Atthefirst
glancethisspeciesresemblessmall-sizedindividualsofPh1oeolryaobscu1'a(LEWIS,
1895),butisquitedifferentinsomeimportantcharacteristics.
A量oracarefulstudy,theauthorcametotheconclusionthatthisspeciesisnewto
science,thoughitisverycloselyalliedtoPh1oeotrvasubtilisREITTER,1897fromEu-
ropetosoutheasternSiberia.
Beforegoing further, thepresent authorexpresseshissinceregratitudeto Dr.
Masatoshj TAKAKUwA of the KanagawaPrefectural Museum of Natural HiStO「y,
Odawara, forhiscriticalreadingofthemanuscriptandtoDr.NikolaiB.NIKITSKYof
thezoo1ogjca1MuseumofMoscowLomonosovStateUniversityforhiskindguidance
andhelpforthisstudy.HisheartythanksareduetoMr.YutakaISHIKAWAofMa「uko-
machj,Naganoprefecture,forhisusefuladviceandcooperation.Heisalsodeeplyin-
debtedtoMr.HiromuKAMEzAwAofShowa-machi,SaitamaPrefecture, forhiskind-
nessingivingtheauthoranopportunitytoexamineinvaluablematerials.Further,he
thanksMr.Hisayuki ARIMoTo forhisinvaluableadviceandtakin9Photo9raPhSin-
sertedinthispaper.
Theholotypeandonefemaleparatypewillbedepositedinthecollectionofthe
Natjona1scjenceMuseum(Nat.Hist),Tokyo,andtheotherparatypesarepreservedin
thecollectionsofMr.YutakaIsHIKAwAandtheauthor.
98 RyojiToYosHIMA
1 2
Figs.1-2. Ph1oeotrvals/1ikau,alspnov;1,male(paratype);2,female(paratype)
PllloeotryaishikawaiToYosH1MA,sp
nov.
[Japanesename:Shinano-hoso-nagakuchiki]
(Figs. l-4)
Male. Length: 3.1-48mm. Humeral width: 0.8-1.3mm. Small, slender and
cylindrical thoughslightlydepressedabove.Hea pronotumandelytrablack.Anten_
naeblackishbrownexcept forthreebasalsegmentswhichareyellowishbrown.Ven_
fratsurfaceexcept forabdominalsegmentsblackishbrown.Legsandabdominalseg_
mentsdarkreddishbrown.Bodyuniformlycoveredwithrecumbentandbrownpubes_
cence,whichisveryfineandshortonabdomen.
Head shallowly andcoarselypunctulate, interspacebetweenpuncturesclosely
micro-Punctulate; fronswideandtransverse, interocularspacemuchwider thaneye
lobein frontalview;hindportionofvertexshallowly foveolateinthemiddle.Eyes
moderatelylarge,elongate-ovateandfeeblynarrowedinferiorly;anteriormarginsnot
emar9inate.Antennaesubfiliform,reachingbasalanglesofpronotumoralittlebeyond
them;eachsegmentlongerthanwide;eachof3rdto10thsegmentsthickenedapicad
andsubobconica1;1stsegmentclavateapica 0.72timesaslongas3rd;2ndtheshort_
est,0.56timesaslongas3rd;3rd1.13timesaslongas4th;5thand6thequal in
fen9th,0.94timesaslongas4th;eachof7thto10thsomewhatcompresse(i,subequa1
inlengthandslightlyshorterthan1st;11ththelongest,1.92timesaslongas10th,
thickenednearbase,thengentlyattenuateapicad,apexratheracute.
Maxillary palpus finely punctulate;2ndsegmentsubtriangular, alittlebroader
NcwP1//oeo1,、afromCentralJapan 99
3
4
Figs 3-4. P/l1oeot、ft ls/lika、l・al sp. nov; three
apicalsegmentsofmaxillarypalpus:3,male;
4,female.Scale:0.25mm.
than3rd;3rdacutelytriangular,withapicalmarginalittlelonger thanbasaloneand
veryslightlyshorter thanouter one; terminalonebroadlysubcultriform,muchlarger
than 2n outer margin feeblycurvatenear apex,apical angleacuteand inner one
widelyrounde apicalmarginbetweentheseanglesfeeblyarcuateoutwards.
Pronotumalmostsemiovateindorsal view, longer thanwide(ratio: - 1.15: 1),
widestjustbeforethebase, thengentlyroundlynarrowedapicadandslightlysoto-
wardsthebasalcornerswhichareverynarrowlyrounded;anteriormarginstronglyar-
cuateoutwards;lateralsidescompletelymargined frombasetoapexthoughthemar-
ginationsaresomewhatobsoleteat the frontcorners; basal margin almoststraight
thoughveryslightlybisinuate;discmoderatelyconvexand feeblydepressedmedially,
bearingapair of rather broadand subtriangular foveaebeside themiddleofbase,
coarselyandcloselypunctate,interspacebetweenpuncturesverycloselymicro-punc-
tulate,middleofthediscnotrugoseandsometimeswithverynarrowshortlongitudi-
nalimpunctatearea.
Elytrawidestnearthemiddle,slightlywiderthanthewidestportionofpronotum,
gentlyandroundlynarrowedapica veryslightlysobasa apicesnarrowlydehiscent
andeachnarrowlyrounded;discmoderatelyconvexthoughfeeblydepresse without
visibleveinsorcostae,shallowly,coarselyandverycloselypunctulate, thepunctures
beingsmallerthanthoseonpronotum,basalportionsjustinsidehumerisomewhatim-
pressed.Scutellumrelatively largeinproportion tothesizeofbody, transversewith
posteriormarginrounded,moderatelyconvexabove,coarselyandcloselypunctulate.
Legs rather short though stout, aciculately punctateor finely sculptured; fore
coxaecloselycontiguoustoeachother;all femora attenedandclavate;eachsegment
of foretarsusflattenedanddilatedapicadexcept forsimpleandvery slender5thseg-
ment,1stalittlelonger than2ndwhichisthebroadest,and4thbilobed;middleand
100 RyojiTOYOSHIMA
hindtibiaesubequa1torespectivetarsiinlength;middleandhindtarsalsegmentssim-
pleandcylindrical;ratiooflengthsofmiddleandhindtarsalsegmentsasfollows:- 1:
0.55: 0.45: 0.21: 0.44 and160: 0.66: 0.30: 0.43, respectively; middletibiaemuch
shorter thanhindones; eachpairofmiddleandhind tibialspursshort, unequal in
length;clawssimplewithbasalhalfofinneredgethickened.
Prosternumcloselypunctulate;middleofintercoxalportionshort, feeblyangulate
backwards. Mesosternum coarsely andfinely punctatein themiddleandextremely
closelymicro-punctulatelatera11y;medianprocessratherbroadlyandtriangularlypro-
jectingbackwardswithapexreachingalittlebeforethemiddleofcoxaewhichare
contiguousbehind.
Abdomenwith5visiblesternites;eachsternitessimple,withoutimpressionsor
tuberculousprojections,finelyandcloselypunctulate;5thsternitewidelyemarginate
onapicalmargin,withapico-1atera1cornersobtuselyangulate;apicalmarginofanal
tergitefeeblyemarginate.
Female. Length: 2.9-5.9mm.Humeral width: 0.7-1.9mm. Coloration as in
male.Bodysomewhatslendererthaninmale.Antennaeshorter,reachingbasalcorners
ofPronotumoralittlebeforethem;eachof3rdto10thsegmentssubcupulate,feebly
thickenedapicad;apicalmostapparentlyshorterthaninmale,feeblyattenuateapicad.
Maxillarypalpusshorterandslenderer thaninmale;apicalmarginof3rdsegment
moderatelyincurvate;apicalmostapparentlyshorterthaninmale,withapicalmargjn
morestronglyrounded.Pronotumslightlynarrowerthaninmale.Legsslendererthan
inmale; foretarsalsegmentsslenderandcylindrical,notdilated;1stsegmentsofhind
ta「SuS1on9erthaninmale.Apexof5thabdominalsegmentalmoststraightorveryfee_
blyarcuate.Apexofanaltergitealmoststraightor feeblyemarginateinthemiddle.
pcseries'. Holotype: Sugadaira(ca.1,100minalt),Sanada-machi,Chjjsa_
,
9ata-9un,NaganoProf,Japan,21-V-1992(rearedandemerged fromdeadtwigsof
Fraxinusmandshuricavar.Japonica,whichwerecollectedon30thApril,1992),Ryoji
TOYOSHIMAl9t.Paratypes:19,samedataastheholotype.Samedataastheholotype
except for theemergeddates, 2ed, 19, 22-V-1992; 1d, 25_V_1992; 1d 27_v_
1992; 1?,28-V-1992; 1?,2-VI-1992; 1(1 15-VI-1992; 2 25-V_1992. Same
,
dataastheholotypeexceptforthecollecteddateofthehost(30thAprj1,1gg3)andthe
emergeddates,1d,22-V-1993;1d,4 ,26-V-1993;1d,30_v_1993,1 !,sameIo_
Calityastheholotypebutcollectedinthefief 26-VII-1989,HjromuKAMEzAwAlgt
Notes. This new speciesisverycloselyalliedtoPh1oeolryasubtilisREITTER,
1897distributed fromEuropetosoutheasternSiberia,but differs from it inhavjng
Close「andfinerpuncturesontheprothoraxandthelateralsidesofthepronotumcom_
Pletelymargined frombasetoapex. Italsosomewhatresemblesp obscura(LEWIS,
1895)f「omJapan,butisdistinguishedfromthelatterbythesmallerbody,theshorter
P「oSte「na1process,thefinerpuncturesonthepronotumandthesimpleabdomjna1ster_
niteSinthemalewithoutsexualimpressions.Further,thisspeciesmaybedistinguish_
ablef「omf)parvula(LEWIS,1895)bythedifferentcolorofbodyandshortermesoster_
nalprocess.
NewPh1oeotryafromCentralJapan 101
ThisspeciesisnamedafterMr.YutakaIsHIKAwAinhonorofhismanydiscoveries
inthemelandryid faunaofNaganoPrefecture.
要 約
豊嶋亮司:中部日本から発見されたPh1oeotrva属の1新種. - 長野県管平で採集したヤチ
ダモ枯枝より羽化した小型のナガクチキムシを新種と認め, シナノホソナガクチキPh1oeotrya
ishikawaiToYosHIMA,spnov.と命名して記載した.本極はヨーロッパからシペリアにかけて分布
するRsubtilisREITTERに西告似するが, 前1向部はより微細に点刻され, その側緑は基部から先端
まで完全に縁取られることで区別される. さらに本種は, 日本に分布するビロウドホソナガク
チキPobscu1-a(LEWIS,1895)およびニセビロウドホソナガクチキ1)pal・vula(LEWIS,l895)に似てぃ
るが, 前者とは体がより小型で前胸腹板突起がきわめて短いこと, 前胸背板の点刻がより微細
であること, の腹板が単純であることなどにより, また後者とは色彩が異なり中1向順板突起
が短いことにより区別できる. なお, 本種の種名は長野県在住のナガクチキ研究家である石川
豊氏に因む.
References
LEWIS,G.,1895. OntheCistelidaeandotherheteromerousspeciesofJapan. Ann.Mag nat.Hist.,(6),
15:250-278,422-448,8pls.
NIKITsKY,N.B.,1989. ThebeetlefamiliesTetratomidaeandMelandryidaeof theUSSRFarEast. Sh.
Tli・ud.zool.Muz.MGU,27:3-87.(InRussian)
REITTER,E.,1897. Ph1oeot,yasubtilisn.sp. Dt ent.Z.,23:246.
_ 1911. FaunaGermanica.DieKaferdosDeutschenReiches,3.436pp.,48pls.Stuttgart.
SEIDLITZ,G.,1898. InERlcHsoN,WF.(ed),Naturg.Ins.Delltsc1l1.,5(2):305-680.
