Thinoscatella tibetensis Zhang & Yang, 2005, sp. nov.

Thinoscatella tibetensis sp. nov.

(Figs. 1–8)

Diagnosis. Anterior margin of mesofrons with 8 small setae; facial setae gradually lengthened toward oral margin, facial carina with a series of lateral facial setae extending to posterior corner of head. Oral setae longer than facial setae. Eye­to­gena ratio, male 1: 0.25. Epandrium long, about 2 times longer than wide in posterior view, and without long setae at apex; cercus short and thick; surstylus slender and long in posterior view; gonite distinctly wide at apex in lateral view; phallapodeme umbrella­like in ventral view; phallus trumpet­like in ventral view. S6 with two bar­like tapered processes located on each side in ventral view.

Description. Male body length 1.9 mm, wing length 2.0 mm.

Head. Subshiny black, with thin rusty pollen; mesofrons nearly polished with metallic bronze luster pollen. Setulae and setae on head black; anterior margin of mesofrons with 8 small setae; 1 outer vt as long as 1 medial vt; 1 pair of strong oc; 4 lateroclinate orb, 1st and 3rd thin and short, 2nd and 4th setae well developed. Protruding face black with rusty dense pollen, facial setae gradually lengthened toward oral margin, facial carina with a series of lateral facial setae extending to posterior corner of head. Oral setae longer than facial setae. Eye­to­gena ratio, male 1: 0.25. Antenna brown; antennal segments 2 with grey pollen, antennal segment 3 with rusty pollen; arista micropubescent.

Thorax. Subshiny black; mesonotum brownish yellow microtomentose. Setulae and setae on thorax black. 3 dc (1+2); 2 rows of small acr extending near scutellum; 1 strong presutural seta; anterior npl as long as posterior npl; 1 psa longer than sa; mesopleuron with 1 long seta and several short setae; sternopleuron with 1 strong seta and 1 short seta on upper portion; scutellum with 2 pairs of sc, lateral sc small. Legs dark brown with grey pollen; tarsi brown. Setulae and setae on leg black. Fore femur with several rows of setae; mid femur with row of av; fore tibiae with a row of setae. Wing light brown, C extending to apex of M. Halter pale yellow.

Abdomen. Subshiny black with thin grey pollen.

Male genitalia (Figs. 5–8). Epandrium long, about 2X longer than wide in posterior view, and without long setae at apex; cercus short and thick; surstylus slender and long in posterior view; gonite distinctly wide at apex in lateral view; aedeagus distinctly expanded and phallapodeme recurved at apex in lateral view, phallapodeme umbrella­like in ventral view; phallus trumpet­like in ventral view. S6 with two bar­like tapered processes in ventral view, which are located on each side.

Female. Body length 2.3–2.8 mm, wing length 2.5–3.0 mm.

Type material. Holotype male, Tibet: Nielamuselong, 11. VI. 1966, leg. Shuyong Wang. Paratypes 1 male 11 females, same data as holotype; 1 male, Tibet: Mangkang, Mangcuo, 16. VI. 1976, leg. Xuezhong Zhang.

Etymology. The specific epithet derives from the type locality Tibet.

Distribution. China (Tibet).

Remarks. The new species is easily distinguish from Thinoscatella lattini Mathis and Thinoscatella quadrisetosa (Becker) by the slender surstylus, the shape of S6, the epandrium which lacks long setae at apex in the posterior view, and the gonite which is distinctly wide at apex. In T. quadrisetosa, the epandrium has long setae at apex, the slender surstylus is not extended beyond the epandrium in the posterior view, S6 has a median process, and the gonite is rounded at apex (Mathis, 1979; Olafsson, 1991). In T. lattini, the gonite is slightly expanded and recurved at apex (Mathis, 1979).