Five New Passalid Beetles of the Genus Leptaulax (Coleoptera, Passalidae) from the Philippines, with a Key to the Species of the Philippinese Leptaulax in the Author's Collection

14 Pages·1996·2.3 MB·English

by  Iwase, K

E、l,t・,a,Ttok、・o24(2):279-292,November15.1996
FiveNewPassalidBeetlesoftheGenusLeptaulax(Coleoptera,
Passalidae) fromthePhilippines,withaKeytotheSpecies
ofthePhilippineseLeptaldaxintheAuthors' Collection
Kazuo IWASE
3-15-10.Shirasagi,Nakano-ku.Tokyo,165Japan
Abstract FivenewpassalidbeetlesofthegenusLepta!Ila、-KAuparcdescribed
from thePhilippines. Leplatlla、-l,1te,,neditlssp nov from Mindoro、Leptall/a、- lu::otuctls
spnovfromLuzon、Leptatda_、sakaiisp novandLeptallla、l,leg,・esc,Isissp nov fromNe-
grosarerelatedtoL.1le,1o1IwAsE,Leplaula、-,nl,ldanaoe,Isissp nov from Mindanaore-
semblesL.cyc/otae川fisKuwERT.Asanappendix、akeytothespeciesofthegenusLep-
tatl/a11,1fromthePhilippinesisprovided.
In thispaper,theauthorisgoingtodescribefivePhilippinesepassalidbeetlesof
thegenusLeptaulaxKAuP.AiltheholotypeswillbepreservedintheNationalScience
Museum (Nat. Hist),Tokyo.Asanappendix,atentativekey to thespeciesofPhilip-
pineseLeptaulaxisprovidedbasedonthematerialsintheauthor'scollection.
Leptaulaxinter″lediussp nov.
(Figs.1-2)
Blackandshining,ventralsurfacesomewhatreddish.
Anteriormarginofheadwith four tubercles,median tubercleabsent; innertuber-
cleparabolic, larger thanouterone,thedistancebetween thetwoinner tubercles l 8-
1.9timesaslongasthatbetweeninnerandouterones;outertubercletriangular,acute;
frontal ridgejoiningcentral tuberclewithashort longitudinal ridge,slightly tubercu-
lateandstronglycurvedatthemiddle,andextendingtoinnertubercle;centraltubercle
moderately raised, parietal ridge joining supraorbital one; supraorbital ridge indis-
tinctly joiningsupraoccipitalone; frontalareaquadrangularorsemicircular,conver-
gentanteriorly,widerthanlong(L/W=0.5-0.6),withscatteredhair-bearingpunctures;
depressed area ofhead including thepart just behind outer tubercles ratherdensely
coveredwithlargepunctures,someofwhichbearahairnear thetuberclesof frontal
ridgesandbehindparietal ridges; eyecanthusshagreenedand opaque, withashort
longitudinal ridgesmooth,anterioranglerounded;eyemoderately large;hypostomal
process smooth and shining, with a longitudinal groove shagreened and opaque.
Labrumwithanteriorborderalmoststraight. Antennal lamellaeshort.Middlepartof
280 KazuolwAsl:'
mentumwithsomelargepunctures,anteriorborderprotrudentanteriorlyatthemiddle,
scarrather large,J-shaped; lateralpiecewithscatteredhair-bearingpunctures.Ligula
lacking longitudinal ridge. Secondsegment of labial palpusshorter than third one.
Mandibleobtuselyangulateandslightlyprotrudentat themiddleonexternalsidein
ventralview; upper toothobtuseinlateralview;Ie量anterior lowertoothacute, larger
thanrightone,withinneredgeverticallytruncate.
Pronotum weaklyconvex,hairless;anteriorangleobtuse,notdistinctlyprotrud-
ent,scarsindistinctlydepressed,mediangrooveshort;surfaceratherdensely covered
withlargepuncturesonlateral1/4-1/3.
Elytraweakly convex, hairless; dorsal groovesdistinctly punctate, lateral ones
broader than theadjoining ribs, with transversepunctures; dorsal ribs very slightly
convex.
Prosternum shagreened and subopaque; posterior plate smooth, shining and
somewhatraisedalongallborders,shagreenedwithindistinctpuncturesatthemiddle.
Mesosternum smooth at themiddle; scars broad, shagreened and subopaquealong
innerwallandouter border, rathersmoothandshiningat themiddle, inner wallex-
tending tonear posterior border ofsternum. Metasternumwithcentralareaalmost
smooth, withscattered largepuncturesat themiddle, anteriordepressionalmost ab-
sent;anteriorintermediateareasmooth,withsomepuncturesnearmiddlecoxa,poste-
rior onerather denselypunctate, butsmoothalong lateral area; lateral areaverynar-
row, finely and irregularly punctatealong intermediate area,shagreened and sub-
opaquealongexternalborder.Abdominalsternitesfinelyanddenselypunctateatsides;
sixthstemitetruncateatthemediant/3,finelyanddenselypunctateatsidesandalong
anteriorborder, ratherwidelypolishedat theposteriormiddle,withmarginalgroove
distinctatthemedial3/5. Integumentofexternal faceofmiddletibiasmoothandshin-
ing,withscatteredhair-bearingpunctures.
MalegenitaliaasshowninFig 2.
Length:15.0mm.
Holotype: d, Durangan, Mindoro Is., thePhilippines, ll~13-IX-l983; para-
types:2 ,samedataastheholotype.
Thisnewspecies isrunningdowntoL.cyc1otaenlusinGRAVELYs' (l918) table,
butisdifferent fromthelatterintheabsenceofmediantubercleofanteriormarginof
head.1ncidenta11y,thenewspeciesischaracterizedbyacombinationofthe following
points: hypostomalprocessgrooved; ligulawithoutmedian keel;secondsegmentof
labialpalpusshorter thanthethird;sidesofelytrahairless.Therefore,itresemblesL.
uenoiandthefollowingthreenewspecies,buttheelytralshouldersarehairyinthefat-
ters.
eptaMIM加zorn'el‘ssp nov
(Figs3-4)
Blackandshining
PassalidBeetlesfromthePhilippines 281
'\
、
12
Figs 1_2 Leptatda1し-l'nte,・,nediussp nov; l,head;2,malegenitalia:a,dorsalView,b,late「alView,C
ventralview(Scale0.5mm).
Anterjormarginofheadwithfivetubercles,medianoneminuteandobtuse,inne「
tubercletriangular,largerthanouterone,withapexrounded,thedistancebetweenthe
twojnner tubercles18-1.9timesaslongasthatbetweeninnerandouterones;cute「
tubercletrjangular,withapexsharp;anteriorangleofheadminutelyangulate; f「ental
rjdgejojnjngcentral tuberclewithashort longitudinalridge,tuberculateandSt「on9ly
curvedatthemiddle,andextendingtobaseofinnertubercle;centraltuberclemode一「
atelyraised,parietalridgeveryindistinctlyjoiningsupraorbitalridge,occasionallynot
jojnjngit;supraorbitalridgeratherdistinctlyjoiningsupraoccipitalone; frontala「ea
quadrangular,convergentanteriorly,wider thanlong(L/W=0.6-0.7),smooth,With
several hair_bearingpunctures; depressedareaofheadalmostsmooth,withSeVe「al
hajr_bearingpuncturesnearthetuberclesoffrontalridges,andbeforeandbehindpari-
etalridges;eyecanthussmoothandshining,withafinelongitudinalrid9e,ante「Oi 「
angleacuteandsomewhatre?exed, lateralborderslightlynotched;eyeratherSmall;
hypostomal process shagreened, subopaque, with a shallow longitudinal 9roOve.
Labrumwithanteriorbordernearlystraight.Antennallamellaeshort.MiddlePa「tof
smooth,anterior borderweaklyarcuate;scar large,J-shaped; lateralPiece
mentum
wjthseverallargehair-bearingpunctures.Ligulalackingmediankeel.Secondse9ment
oflabja1palpusshorterthanthirdone.Mandibleobtuselyprotrudentatthemiddleon
externalsjdejnventralview;leftuppertoothobtuse,withalowconvexitybehindan-
terjortjp;leftanteriorlowertoothsharp,largerthanrightone,withinnered9eobtuse.
282 KazuoIwASE
pronotumweaklyconvex,hairless;anteriorangleobtuse,notprotrudent,median
groovebroad,abbreviatedanteriorly,lateralgroovebroad,withlargepunctures;Su「-
facerathersparselycoveredwithlargepuncturesbehindanteriorangles,andinand
around lateralscars.
Elytraweakly convex,sparselyhairy in front ofshoulders; groovesdistinctly
punctate, lateral onesnarrowerthan theadjoiningribs,punctures inlateral 9「coves
rounded;ribsweaklyconvex.
prosternumwjthposteriorplateshining,shallowlyandsomewhatrugoselypunc-
tate at the mjddle, smooth along all borders; median keel shagreened and hai「y.
smoothandshiningat themiddle;scarbroad,shagreenedandopaque
Mesosternum
anteriorly,sparselyandirregularlypunctateandshiningposteriorly,innerwallabout
1/3 to t/2aslongaslateralborderofsternum. Metasternumwithcentralareashal-
lowly,minutelyandsomewhat indistinctlyrugose,anteriordepressionalmostabsent;
anterior intermediateareasomewhatshagreenedandshining,withscatteredhair-boa「一
ingpunctures,posterioronealmostimpunctate,butcoveredwithlargepuncturesalon9
centralarea; lateralareanarrow,finelyrugose,shining.Eachabdominalsternitenar-
rowlyandfinelypunctateatsides; fifthone frosted-lookingat themiddle;sixthone
rathersharplymarginatealongposteriorborder,almostimpunctate, frosted-1ookin9at
themiddle. Integumentofexternal faceofmiddletibiasmoothandshining,withscat-
teredhair-bearingpunctures.
MalegenitaliaasshowninFig 4.
Length:15.5mm.
, -r一
f- ,-
-
、、 ,
- l
_
、 ,
、 ー '
3
f
.
1', ' 博ｯ ・--',1'11, :・
... l, l4
:
a c
Figs 3-4. Lepta1llaxlu::onicussp nov;3,head,4、malegenitalia:a,dorsalview,b,1ateralview,c,ven-
tralview(Scale0.5mm).
PassalidBeetlesfromthePhilippines 283
Holotype:dBanaue,Ifugao,LuzonIs.,thePhilippines,V-1988;paratypes:2 d,
4exs.,samedataastheholotype;2 ,samelocalityastheholotype,V-l987;19,
samelocalityastheholotype,V-1991.
ThisnewspeciesisrunningdowntoL bicolorinGRAVELY's(1918)table,butiS
djfferentbythehairyshoulders.Thenewspeciesischaracterizedbyacombinationof
thefollowingpoints:1)hypostoma1processshagreendandgrooved;2)1igulalackin9
medjankeel;3)secondsegmentoflabialpalpusshorterthanthirdone;4)frontalarea
wjthscatteredhairs;5)elytrahairlessatsides,hairyinfrontofshoulders.Itisdifferent
fromL.uenoiIwAsEandthefollowingtwonewspeciesinacombinationofthefo11oW-
jngcharacters:mediantubercleofanteriorborderofheadpresent;headveryspa「Sely
punctate;mesosterna1scarsalmostshining;lastabdominalsternitealmostimpunCtate;
bodysmall.
Leptaulax:negrosensisspnov.
(Figs5-6)
Blackandshining,ventralsurfacesomewhatreddish.
Anterjormarginofheadwith fourorfivetubercles,medianoneabsentor ve「y
slightlyandobtuselypointedanteriad;innertubercletriangular,far9erthancute「one,
wjthapexrounded,thedistancebetweenthetwoinnertubercles15-1.7timesaston9
as that between inner andouter ones; outer tubercletriangular, acute; frontal 「id9e
jojnjngcentraltuberclewithashortlongitudinalridge,tuberculateandstron9lyCu「Ved
at themjddle,andextendingtoinnertubercle;central tubercleratherhighly「aSied;
parjetalrjdgegraduallybecominglowerfrommiddletoside,veryindistinctlyextend-
jngtosupraorbitalridge, frequentlyshort,endingbeforesupraorbitalrid9e;suP「aO一「
bjla1rjdgeindistinctlyjoiningsupraoccipitalone; frontalareaquadrangular,conver-
gentanteriorly,widerthanlong(L/W=0.6),withscatteredhair-bearin9Punctures;de-
pressedareaofheadratherdenselycoveredwithlargepuncturesinmostpart,Spa「Sely
sobeforeandbehindparietal ridges,someofthepuncturesbearingahairnearthetu-
berclesof frontal ridgesandnearparietalridges;eyecanthusshining,withafinelOn-
gjtudjna1rjdge,anteriorangleratheracute,withapexrounded;eyelarge:hypOSOtmal
processshagreenedandsubopaque,withashallowlongitudinalgroove.Labrumwith
anteriorborderveryslightlyarcuateorstraight.AntennallamellaeratherIon9.Middle
partofmentumwithanteriorborderratherstronglyprotrudentanteriad;Sea「Ia「9e,U-
shaped;lateralpiecewithscatteredhair-bearingpunctures.Ligulalackinglongitudinal
keel secondsegmentoflabialpalpusshorterthanthirdone.Mandibleobtuselyangu-
lateonexternal sideinventral view; leftupper toothrectangular,witharathe「hi9h
convexitybehindanteriortip;leftanteriorlowertoothtrian9ular,1ar9erthanri9htone,
withinneredgetruncate.
pronotumweaklyconvex, hairless;anteriorangleslightlyprotrudentante「iO「ly,
wjthapexrectangular;lateralgrooveratherbroad,withtwoorthreeirregula「「oWSof
punctures;medjangrooveshort;surfaceratherdenselycoveredwithlargepunCtu「eS
284 Kazuol、、ASE
on lateral 1/3.
Elytraslightlyconvex,sparselyhairyin frontofshoulders; fourdorsal9roOVeS
wjthsmallpunctures,fifthIotenthoneswithlargeroundpunctures,narrowe「thanthe
adjoiningribs;dorsalribsalmostflat.
prosternumwithposteriorplatesmoothandweaklyraisedalongallborders,Shin-
jng,fjnelypunctateorrugoseatthemiddle.Mesosternumindistinctlyfrosted-loOkin9
atthemiddle,ratherwidelyshagreenedandopaquealonglateralbordersandinSea「S;
scarratherbroad, rathershallow,innerwallofscarabout1/2aslongaslateralbo「do「
ofsternum.Centralareaofmetasternumslightlyuneven,withafewlargepunCtu「oS,
wjthshallowtriangulardepressionanteriorly;anterior intermediateareaindis-
and
tinctlyshagreenedandshining,withscatteredshallowpuncturesandseveralhai「S;
posterioroneratherdenselypunctatealongcentralarea,withseveralPuncturesatthe
mjddle;lateralareanotsharplydefined fromintermediatearea,narrow,finelyrugose
andsubopaque.
Lateral scarsofabdominal sternites narrow, finely punctate; fifthone frosted-
lookjngat themiddle;sixthonesharplymarginatealongposteriorborder,weakly
emargjnateat themiddleofposteriormargin, finelypunctateatsidesandalongante-
rjor border, impunctateand frosted-lookingat themiddle,withposteriorma「gina1
grooveatthemediant/2.
Integumentofexternal faceofmiddletibiasmoothandshining,withscattered
\ 5
l/
、
6
Fjgs 5_6. Leptaulaxneg,esc,Isissp nov;5,head;6,malegenitalia:a、dorsal view,b,lateral view,c,
ventralview(Scale0.5mm).
PassalidBeetlesfromthePhilippines 285
hair-bearingpunctures.
MalegenitaliaasshowninFig6.
Length:15.5-16.5mm.
Ho1oype: , Mambuca1, Negros Is, thePhilippines, V-1988; paratypes: 2,313,
4 5exs.,samedataastheholotype.
,
Thenewspeciesresemblestheprecedingnewspecies,L. luzonicus,butisdiffer-
ent fromthelatter inthe followingpoints: headdenselypunctate;mesostema1scars
opaque;lateralareaofmetasternumrugoseandsubopaque.
Leptaulax:sakaiispnov.
(Figs 7-9)
Blackandshining.
Anteriormarginofheadwith four tubercles,medianoneabsent; inner tubercle
triangular,largerthanouterone,withapexrounded,thedistancebetweenthetwoinner
tubercles1.9-2.0timesaslongasthatbetweeninnerandouterones;outertubercletri-
angular,acute;anterioranglenotprominent; frontalridgejoiningcentraltuberclewith
ashortlongitudinalridge,tuberculateandstronglycurvedatthemiddle,andextending
Fig. 7. Leptaulaxsakaiispnov.,dorsalaspect
286 Kazu0l゛ASF.
/'_ :1、、
l1l' - _ 、、l、
l 、 l : ・/
8
,
',
--- l,i・
Fjgs 8._9 Leptat1/a、sakallspnov;8,head,9,malegenitalia:a、dorsalvie、v,b,lateralview,C,Vent「al
view(Scale0.5mm).
toinner tubercle; central tuberclemoderatelyraise rectangular inlateralview;Pa「i-
elalridgegraduallybecominglower fromthemiddletoside,joiningsupraorbitalone;
supraorbital ridgeindistinctlyjoiningsupraoccipitalone, frontal areaquadrangular,
widerthanlong(L/W=0.5),withscatteredhair-bearingpunctures;depressedareaof
headincludingthepartjustbehindoutertuberclesrathersparselycoveredwithta「9e
punctures,someofwhichbearahairnearthetuberclesoffrontalarea,andbeforeand
behindparietal ridges;eyecanthussmoothwithseveralhair-bearingpunctures,ante-
rioranglewidelyrounded;eyerather large;hypostomalprocessshagreenedandsub-
opaque, with alongitudinal grooveshallow. Labrumwithanterior border slightly
emarginate.Antennallamellaerathershort.Middlepartofmentumsmooth,withante-
riorborderarcuate,scarrathersmall,elliptical;lateralpiecewithscatteredhair-bear-
ingpunctures. Ligulawith vestigial median keel.Secondsegmentof labial palpus
shorterthan thirdone. Mandibleveryobtuselyangulateonexternalsideinventral
vjew; leftuppertoothrectangular,withahigherconvexitybehindanteriortip;Ie量an-
lerjor1owertoothtriangular,largerthanrightone,withinneredgeverticallytruncate.
Pronotum moderately convex, hairless; anterior angle not protrudent, lateral
groovebroad,withtwoirregularrowsofpunctures,posteriorborderdistinctlyemar-
gjnateatmediant/3;mediangroovefine,lateralscarssmall,rounded,surfacesparsely
punctateon lateral 1/4 (female) or sparsely so behind anterior angles, and in and
PassalidBeetlesfromthePhilippines 287
aroundscars(male).
Elytraweaklyconvex,withhairtuftsin frontofshoulders, fused;groovesdis-
tinctlypunctate,lateralonesnarrowerthantheadjoiningribs,butpuncturesinlateral
groovessomewhat transverse; dorsal ribsweaklyconvex; hindwingsincipiently re-
duced
prosternumwithposteriorplatesmoothalongallborders,shiningandminutely
punctateatthemiddle.Mesosternumindistinctlyfrosted-looking,veryshallowlyand
semicircularlydepressedat themiddle,shagreenedandsubopaquealonglateralbor-
dersandinscars;scarratherbroad,innerwallnotsharp,about2/5aslongas lateral
borderofsternum.Centralareaofmetasternumpolished,withaslighttransversede-
pressionbehindthemiddle,anteriordepressiontriangularandshallow;anterior inter-
mediateareasmoothandshining,withscatteredhair-bearingpunctures;posterior in-
termediateareawithscatteredlargepuncturesalongcentralareaandatthemiddle;lat-
eralareanotsharplydefined fromintermediatearea,somewhatbroad,widestatbasal
2/3, finely rugose,shining. Lateral scarsofabdominalstemitesrather narrow;sixth
onealmostsmooth,finelypunctatealonganteriorborder,sharplymarginatealongpos-
teriorborder. Integumentofexternal faceofmiddletibiasmooth,withscatteredhair-
bearingpunctures.
MalegenitaliaasshowninFig 9.
Length: l8.5(male)-19.0(female)mm.
Holotype: d Mambucal,Negros Is., thePhilippines, VI-1990; paratype: l9,
samelocalityastheholotype,VIII-1990.
ThisnewspeciesresemblesL.uenol IwAsEandtwoprecedingspecies,butisdif-
ferentfromthefattersinacombinationofthefollowingpoints:mediantubercleofan-
teriormarginofheadabsent;headratherdenselypunctate;pronotummoderatelycon-
vex.
Leptaulax″lindanaoensissp nov.
(Figs.10-1l)
Blackandshining,ventralsurfacesomewhatreddish.
Anteriormarginofheadwithfivetubercles,medianonesmallandveryobtuse;
inner tubercle triangular, rather acute,somewhat larger than outer one, with apex
rounded,thedistancebetweenthetwoinner tubercles2.0timesaslongasthatbetween
innerandouterones;outer tubercletriangular,withapexrathersharp;anteriorangle
notprominent; frontal ridgejoiningcentral tuberclewithashort longitudinal ridge,
slightlytuberculateatthemiddle,obtusely,angulatelycurvedbeforethemiddle,and
extendingtoinnertubercle;centraltubercleratherhighlyraised,acuteinlateralview;
parietal ridgeshort,graduallybecominglower fromthemiddletoside;supraorbital
ridgejoiningsupraoccipitalone; frontalareasemicircular,wideranteriorly,widerthan
long(L/W=0.6-0.7),hairless,withscatteredlargepunctures;depressedareaofhead
withscatteredlargehairlesspuncturesjustbehindoutertubercles,andwithhair-bear-
288 KazuoI、,,-、sF.
/ ~・ 、、
、l
1'、l
、
、、
一)
, 、
、 ,へ /
/
、
10
,,
a
Fjgs 10_ll Leptatl/ax. ,nl,Ida,1aoenslssp no、,.;10、head;11,malegenitalia:a,dorsal vie、v、b、late「al
view.c.ventralview(Scale0.5mm).
jngonesbeforeandbehindparietalridges,eyecanthuswithafinelongitudinalridge,
shagreenedjn frontoftheridge,smoothandshiningbehindit,anterioranglewidely
rounded;eyeratherlarge;hypostomalprocesssmoothwithalongitudinal9roove,the
bottomofwhjchisshagreened.Labrumwithanteriorborderweaklyemarginate, left
anterioranglemorepointedanteriorlythanrightone.Antennallamellaeshort.Middle
pariofmentum frequentlywithafewpunctures,anteriorbordermoderatelyarcuate,
scar large,J-shaped;lateralpiecewithscatteredhair-bearingpunctures.Ligulawitha
finemediankeel indistinct.Secondsegmentoflabialpalpusaslongasthirdone.Ven-
tral faceofmandibleweaklybutrathersharplypointedatthemiddleonexternalSide
jnventralview; leftupper toothrather low,graduallyandslightly raisedposteriorly,
withanteriortiprectangular;leftanterior lowertoothtriangular,largerthanrightone,
withinneredgesharp.
pronotumweaklyconvex,convergentanteriorly,hairless,anteriorborderweakly
emarginateinlateral l/4,anteriorangleobtuse,slightlyprotrudentornot,lateralSCa「
shallow;surfaceratherdenselypunctateonlateral1/3includingscars.
Elytrahairyonanteriorverticalportionandin frontofshoulders;dorsal9rooveS
distinctlypunctate,puncturesinlateralonestransverse;dorsalribsslightlyconvex,lat-
eralonesomewhatnarrowerthantheadjoininggrooves.
Prosternumwithposteriorplateshining,smoothandsomewhatraisedalongall
borders, indistinctly punctate inside the smooth margins, smooth at the middle.
Mesosternumsmoothatthemiddle,shagreenedandopaquealonglateralbordersand