Description of a new curculionid-beetle from Japan : studies on the curculionid-beetles (6)-香川大学学術情報リポジトリ

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Acta Coleopterologica,

editus a

M.

C H ~ J ~

c/o ChGjS Laboratory, Kagawa University, Takamatsu-shi, Japan

DESCRIPTION OF A NEW CURCULIONID-BEETLE

FROM

JAPAN

Studies

on the

Curculionid-Beetles (6)"

By Michio

C ~ r j ~ 8

Hylobius vossi sp. nov.

Body subfusiform, with the median part parallel-sided. General colour shiny black; antennae (excepted the scape which is mostly blackish with the base piceous), tarsi, apices of tibiae and apical part of abdomen red-brown to 'piceous; rather sparsely clothed with whiTe scale-like hairs on the whole surface (the hairs on the elytra arranged in a single file at each interstice); dorsum of pronoturn and elytra very closely covered with white scales, but partly (viz. -medio-anterior area of pronotum, post-median and apical areas of elytra, etc.) glabrous or very lightly covered with white scales; laterio-anterior parts of the underside of prothorax, lateral parts of metasternurn and three basal sternites of abdomen, premedian and postmedian parts of each femur, and pre-apical part of each tibia closely clothed with white scales, the scales on the metasternurn and abdomen with a very faint iridescent sheen.

Head globular, rather finely but not closely punctured, the punctures at the posterior area connected by transverse wavy striae, with a large and deep fovea a t the middle of inter-ocular area. Rostrum nearly as long as prothorax, slightly arched downwardly from the base to near the antenna1 sockets and then strongly bent ventrally, coarsely punctured, with some rather obtuse and longitudinal costae on the basal two thirds part. Antenna: scape strongly elongate, closely approching the anterior border of eye when turned it backwardly, a little longer than the funicle and club combined together, very slender at its most part, but markedly dilated at the apical part; 1st funicular segment slightly longer than the 3rd and

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4th segments united together, 2nd segment distinctly longer than the 1st and about a s long a s the three succeeding segments united together. 3rd-6th segments nearly equal to each other, 7th a little longer and much thicker than the 6th, 3rd-5th segments sparsely pubescent, 6th and 7th segments closely pubescent; club oblong, with the apex acuminated, about a s long a s the 4th-7th funicular segments united together, very thickly pubescent. Pronotum subcylindrical, rather flattish on the median disc, nearly parallel-sided or very slightly widened anteriorly a t the basal two- thirds part, but then strongly narrowed in front; dorsum finely and closely punctured on the whole surface and moreover rather sparsely and irregula- rly clothed with very large punctures;

Hylobius vossi CHGJO, sp. nov. (Holotype,

8

)

a shallow Y- or V-shaped impression, extending just before the scutellum to the middle of disc, is recognized in the present examples. Scutellum much longer than wide, acuminated a t the posterior end; flat, impunctate and glabrous on the surface. Elytra much wider a t the humeral area than pronotum, parallel-sided between the humeral area and laterio-posterior part, and then converged to the sutural end with a gentle curvature; dorsum convex, but post-scutellar area flattish and pre-apical area depressed a t each side; each elytron with ten files of distinct punctures, interstices of these files of punctures flattish a t the basal half, but more or less convex a t the posterior half; with the 9th interstice more strongly convex from the post.humera1 part to the apex and broader than the others. Underside: thorax coarsely, closely and irregularly punctured; abd- omen finely and sparsely punctured, with some large and deep punctures a t each side of two or three basal sternites. Legs comparatively slender; femora each armed with a distinct denticle beyond the middle of underside; tibiae with apic2l bristles brownish and apical hook-like projection well developed.

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$ : Last visible sternite of abdomen with the apical border broad and almost straight or very slightly rounded.

9:

Last visible sternite of abdomen with t h e apical border very narrow and distinctly rounded.

Length: 8.0 mm.

Holotype:

8 ,

Cape Sata, Kagoshima Pref., Kyushu, Japan, 3. v. 1955, H. FUKUDA leg.

Allotype:

9,

do, 26. v. 1953, I. HIURA leg. Paratype: 1 8 , do, 2-5. v. 1958, K. MORIMOTO leg.

This new species may very easily be distinguished from all the known-species of the same genus by the pronotum and elytra are very closely covered with roundish white scales, but the other characters of these parts are very character- istic, too.

The trivial name of this new species is dedicated to my respected seniors Dr. E. Voss of Germany, to whom the author is much indebted for the determination of the present species. The author wishes to express his sincere thanks t o Mr. H. MAEBARA of the Kagoshima University who has so kindly presented the holotype- example to the author.

The holotype is preserved by the author, t h e allotype is deposited in the Entomological Laboratory of Kyushu University and the paratype is kept by Mr. K. MORIMOTO.

*

(1) Curculionid-Beetles of Niigata Prefecture, Honshu, Japan, collected by Dr. K. Baba (I). "Insect Fauna of Niigata Prefecture, Vol. I, published by the Nagaoka Science Museum, Niigata Prefecture, Japan, pp. 24-40, 2 figs. (1957)

(in collaboration with K. Morimoto)"

(2) Curculionid-Beetles of Niigata Prefecture collected by Dr. K. Eaba (11). "Kontyu (published by the EntomologicaI Society of Japan, Tokyo), XXVII, 2, pp. 146-155, Figs. 4-5 (1955) (with K. Morimoto)"

(3) Descriptions of two new Species of the Genus Cyphosenus Schultze from Japan (Coleoptera: Curculionidae-Ceuthorrhynchinae). "Transactions of the Shikoku Entomological Society, Matsuyama, Japan, VI, 4, pp. 49-54, 1 fig.

(1959)."

(4) Descriptions of a new Genus and Species of Curculionid-Beetle from the Island Okinawa in the Loo-Choo Archipelago. "Akitu (Transactions of the Kyoto Entomological Society, Kyoto), VIII, 2, pp. 25-29, Figs. 1-2 (1959) (with K. Morimoto).

(5) Curculionid-Beetles of Niigata Prefecture, Honshu, Japan, collected by Dr. K. Baba (111). "Insect Fauna of Niigata Prefecture, Vol. 111, published by the Xagaoka Science Museum, Niigata Prefecture!, Japan, pp. 11-12 (1959)."

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