Ontholestes napoensis Yang & Zhou

Yang, Zhuo & Zhou, Hong-Zhang, 2012, Review of Chinese species of the genus Ontholestes Ganglbauer, 1895 (Coleoptera: Staphylinidae: Staphylininae) with description of two species new to science, Zootaxa 3191, pp. 1-20 : 3-5

Ontholestes napoensis Yang & Zhou , sp. nov.

( Figs. 1A–F )

Material examined: Holotype: male, CHINA: Guangxi: Napo, Defu (23.2915N, 105.8051E), 1350 m, 2000. VI.13, Jun Chen coll. ( IZCAS).

Description. Measurements of the holotype: Body length 10.5 mm; HW: 2.30; HL: 1.30; CL: 0.95; PO: 0.15; PW: 2.10; PL: 2.15; EW: 3.00; EL: 2.55; ELS: 1.10.

Male. Body relatively small, dull, black, front angles of head and pronotum with scattered short golden pubescence; labrum black with light yellow edge, mandibles and maxillary palps black, clypeus brown; femora black with golden pubescence, tibiae red brown; elytra black with yellow and brown pubescence.

Head nearly rectangular ( Fig. 1F ), distinctly transversal, slightly wider than pronotum; mandibles slender, eyes big and prominent, occupying almost entire sides of head, their longitudinal diameter five times as long as temporal region. Surface rough and rugose, covered with umbilicate punctures; dosally with black pubescence, mixed with sparse golden pubescence; vertex with very narrow impunctate midline. Antennae short, gradually widening towards apex; 1st segment longest, 2nd one third as long as 1st, 3rd narrower than, and twice as long as 2nd, 4–5th short, 4th at most 1.5 times as long as broad, 5th slightly longer than broad, 6–10th distinctly wider than long, gradually increasing in width towards apex of antenna, last segment distinctly longer than 10th and longer than wide, subacuminate.

Pronotum oblong, slightly longer than wide, and narrower than two elytra together in closed position; widest at level of straight anterior margin, slightly convergent towards rounded posterior angles, concavely narrowed in basal third, posterior margin moderately convex, disc with short impunctate midline of about one third of pronotum length and directly in front of pronotal base; punctation and pubescence similar to those on head. Scutellum triangular, densely covered with black velvety pubescence, with golden pubescence at anterior angles.

Elytra subquadrate, slightly dilated posteriad; as long as wide, slightly longer than pronotum; surface densely and finely punctate, with brassy pubescence, mixed with golden pubescence.

Abdomen gradually narrowed towards apex, finely and densely punctate; tergites III–V sparsely covered with golden pubescence, each with one pair of black tomentose spots medially; tergites VI and VIII with golden pubescence at anterior angle, tergite VII with golden pubescence along anterior margin.

Posterior margin of sternite VIII ( Fig. 1A ) deeply and broadly excised medially, densely with long black erect setae; posterior margin of tergite X ( Fig. 1B ) almost straight with numerous long black setae; posterior margin of sternite IX ( Fig. 1C ) triangularly emarginate medially, with moderately long black setae.

Aedeagus ( Figs. 1D–E ) moderately sclerotized, almost symmetrical; median lobe elongate, in ventral view moderately constricted with apex sharply pointed; in lateral view apical portion of median lobe bent ventrad, with a small process near apex. Paramere short and stout, about one third as long as median lobe, its apex rounded, with 6 fine setae.

Female. Unknown.

Distribution. Known only from the type locality in Guangxi, China.

Remarks. In habitus the new species is similar to O. murinus ( Linné, 1758) , but differs from the latter in the shape of head, the colour of antennae and the shape of male genitalia.

Etymology. The species is named after the type locality, Napo, in Guangxi Province, China.

Figures

FIGURES 1 A – F. Ontholestes napoensis Yang & Zhou, sp. nov., male (A – F, holotype). A—sternite VIII; B—tergite X; Csternite IX; D—aedeagus, ventral view; E—aedeagus, lateral view; F—head. Scale bar 1 mm.