INSECTS OF MICRONESIA Coleoptera: Platypodidaeand Scolytidae'

W ood-P latypodida e and Scolytidae 19
Asperities of pron otum br oad, the ir widths conspicuously great er than the ir
thicknes ses, and usuall y arran ged in indefinit e concentric rows toward summit
; anterior margi n of pronotum armed by six to eight teeth, positi ons and
size of teeth regular , median one s usually lar ger ; fr ons either with or without
smooth shining median area exte nding fr om vertex to point below upper level
of eyes; tip s of interstrial scale s rounded ., mu __m m__ m mm.m 2
2. Length 1.1-1.3 mm. ; frons with smooth, shining med ian area on upper half extending
toward vert ex ; anteri or mar gin of pronotum not produc ed, armed by
six teeth, median ones only slightly lar ger ; ant er ior tibiae and tarsi orn amented
by a few short er, subplumose setaemu.m.u m •• m.__...__m__mm.....ll. pacificus
Length 1.4-1.8 mm.; upper med ian ar ea of fr ons finely reticulate ; anteri or margin
of pron otum rath er strongl y produced and ar med by six to eight teeth ,
median ones much larger; ant eri or tibi ae .and tarsi usually orn amented by a
few rather long, plumose setae __mmmum.m__m.m.......u__u..uu.......m__m__.u....12. ramosus
10. Ptilopodius dubiosus Wood , n. sp.
Female: Length 1.16 mm. (paratypes 1.09-1.25 mm.), 2.1 times as long as wide; body
dark brown, elytra a lighter shade of brown.
Fron s convex, with a narro w, tran sverse impre ssion ju st above epistoma, and with a
large , rather deep puncture at center; surface rath er coarsely reticulate , reticulation finer
above and continuing to vert ex ; vestiture rather short and scanty. Eye elongate, entire ;
finely granulate. Antennal club rather large, moderately pubescent, and without indications
of sutures.
Pronotum 1.08 times as wide as long ; widest near base, sides weakly arcuate and
abruptly converging on anter ior third, rather narr owly rounded in front, anterior margin
armed by four small, widely spaced teeth (their position, number , and size irregular in
type series) ; summit ju st behind middle, not high ; anter ior area armed by numerou s,
small, narro w, confused asperities ; posterior area coar sely ret iculate and with rather
nume rous puncta te (volcanolike) granules, more finely sculptured laterall y. Vesti ture
rather abundant and short , consisting of fine and coarse erect setae.
Elytra 1.23 times as long as wide, about 1.4 times as long as pronotum ; sides straight
and subparallel on basal two-third s, very broadly rounded behind ; striae narrow, punctures
small, moderatel y impressed ; interstriae wider than striae, each with a row of rather
close, lar ge, setiferous, punctate granules. Declivity steep, convex ; strial punctur es smaller
than on disc, inter strial granul es as high as on disc, but their diameters smaller and punctur
es usually not readily apparent. Vesti ture consisting of uniseriat e rows of small, fine,
recumbent hair ; and uniseriate rows of erect, slender, inter strial scales, each scale at least
six times as long as wide and with apex usually pointed ; special plumose setae of fore
tibiae and tarsi not apparent.
Male: Similar to female in all respects, except slightly smaller.
Holotype, female (US 64626), east coast, Peleliu, Palau Is., from Pan ­
danus leafstock, Jan . 26, 1948, Dybas ; allotype, male (US) , same data . Par a- I
types : 77 (C M, US , BISHOP ) , same data as for holotype ; five (CNC),
Ulimang, Babelthuap , Palau Is ., Dec. 9, 1947, Dybas.
DISTRIBUTION : Caroline Is. (Palau ) .
HOST: Pandanus sp.
Thi s species combines certain of the character s of 1110st species of Ptilopodius
and of some Cryphalom orphus. Th e antennae and the subsulcate scutellum
are typical of Pt ilopodius ; while the size, shape, and arran gement of asperiti es
on the pronotum are similar to those of several of the smaller Cryph alomorphus