Timomenus bicolor, Sun, Meiling, Li, Kai & Liu, Xianwei, 2016

Sun, Meiling, Li, Kai & Liu, Xianwei, 2016, Three new species of the subfamily Opisthocosmiinae from China (Dermaptera, Forficulidae), with new synonymies and combinations, Zootaxa 4109 (3), pp. 359-371 : 360-361

Timomenus bicolor sp. nov.

( Figs. 1‒6 )

Description. Male size medium, body depressed. Head smooth, slightly swollen. Eyes prominent, length slightly shorter than genae, lateral margins rounded, sutures indistinct. Antennae long and slender, 13 joints, first joint decidedly longer than the distance between the antennal bases; third and fourth joints almost equal in length, cylindrical, but shorter than fifth. Pronotum smooth, almost as broad as long, anterior margin truncate, posterior very feebly rounded, lateral margins weakly convex, hind margin rounded; prozona slightly swollen, median sulcus distinct, with paired depressions on both sides, metazona flat. Elytra and wings fully developed. Elytra smooth, about twice as long as pronotum, external margins without ridge, anterior margins truncate. Scales of wings slightly shorter than pronotum, smooth. Legs rather short, anterior femora thick, hind tarsus with first joint almost equal to third joint, second joint strongly enlarged. Abdomen very depressed, stink-glands feeble but distinct. Last dorsal segment narrowed to the apex, above with two oblique ridges and united short, stumpy tubercles ( Fig. 1 ). Subgenital plate with some punctations, posterior margin broadly rounded ( Fig. 2 ). Pygidium not prominent, apex with short, stumpy tubercles. Forceps widely separated at base, narrowed to the apex and incurved, with strong dorsal tooth and smaller median tooth ( Fig. 3 ), sometimes the median tooth absent. Genitalia ( Figs. 4 ) with aciculiform parameres, basal vesitcle with a small pilous sclerotized plate, virga short and curved.

Female similar to male, but subgenital plate shorter ( Fig. 5 ); forceps slender, simple, nearly touching at base, internal margins crenulate ( Fig. 6 ).

Coloration. Generally yellowish. Head, first antennal joint and glandular callosities black. Scales of wing yellowish, along inner and apical margin with dark band.

Measurements. Total body: ♂ 12.5‒14.0, ♀ 14.0; forceps: ♂ 4.0‒4.5, ♀ 5.0.

Material. Holotype ♂, paratypes 1♂, 2♀♀, Chayu, Xizang, China, elev. 1600m, 2010. VIII.24‒28, collected by Bi Wen-Xuan.

Distribution. China Xizang (Tibet).

Discussion. This new species is very similar to T. oannes ( Burr, 1900) , but differs in that the forceps are distinctly flat at base, and the distance between the inner and dorsal teeth is equal to the distance between the dorsal teeth and the base.

Figures

FIGURES 1 ‒ 12. Timomenus Burr, 1907. 1 ‒ 6: T. bicolor sp. nov. 7 ‒ 12: T. bii sp. nov. 1, 7) Body of male, dorsal view. 2, 8) Subgenital plate of male, ventral view. 3, 9) Forceps of male, dorsal view. 4, 10) Genitalia of male, dorsal view. 5, 11) Subgenital plate of female, ventral view. 6, 12) Body of female, dorsal view. Scale bars = 2 mm.