Timomenus bii, 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 : 361

Timomenus bii sp. nov.

( Figs. 7‒12 )

Description. Male size medium, body slender. Head smooth, swollen. Eyes prominent, length distinctly shorter than genae, sutures indistinct. Antennae long and slender, 13 joints, first joint decidedly longer than the distance between the antennal bases, third joint slightly longer than fourth, but shorter than fifth. Pronotum smooth, almost as broad as long, anterior margin truncate, posterior very feebly rounded, lateral margins narrowed posteriorly, 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. Legs long and slender, anterior femora thick, hind tarsus with first joint almost equal to third joint, second joint strongly enlarged. Abdomen smooth, with very indistinct, sparse punctations, stink-glands feeble but distinct, last dorsal segment somewhat broader than long, narrowed to the apex, above with two long keels and united with pair of slightly raised tubercles ( Fig. 7 ). Subgenital plate broad, with broadly rounded posterior margin ( Fig. 8 ). Pygidum not prominent, narrowed to the apex, hind margin sinuate. Forceps separated at base, narrowed to the apex and incurved, internally serrated in basal half, armed with a very long tooth in half and obliquely raised ( Fig. 9 ). Genitalia ( Figs. 10 ) with parameres as type, basal vesitcle with a semicircular sclerotized plate and ventral margin denticulate, virga long, apex and base distinctly widened.

Female similar to male, but subgenital plate shorter ( Fig. 11 ), pygidium prominent, with the apex truncate. Forceps slender, simple, nearly touching at base, incurved on the apex, internal margins crenulate ( Fig. 12 ).

Coloration. Generally blackish brown, antennae brown with basal two joints dark brown, elytra pale brown, scales of wings dark brown, with a yellowish spot at base.

Measurements. Total body: ♂ 19.0, ♀ 18.0; forceps: ♂ 6.0, ♀ 5.5.

Material. Holotype ♂, paratype 2♀♀, Pianmazhen, Lushui, Yunnan, China, elev. 2300m, 2010. VI.24‒25, collected by Bi Wen-Xuan.

Distribution. China (Yunnan).

Discussion. This new species is very similar to T. shelfordi ( Burr, 1904) , but differs by having forceps with a very long, obliquely raised inner tooth.

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.