♂, Ningxia Hui Autonomous Region, JingYuan County, Liupanshan natural reserves, Dongshanpo, 2100 m, N35^o36.767, E106^o16.189, 28.viii.2009, Z.-H. Yang leg.

3♂♂, the same locality labels as the holotype, all in GUGC.

Dark species with brownish yellow postpronotal callus, scutellar spines, postalar callus and narrow upper margin of anepisternum. Body hairs black, R₄ present, legs mostly dark to black but bases and tips of coxae, femora and tibiae yellow, tarsi black but 1–2 basal tarsomeres on mid and hind tarsus yellow.

Male (Figs 1–6). Length: body 4.8–5.2 mm, wing 4.3–5.0 mm. Head elliptical in frontal view, shining black, with black hairs; slightly broader than thorax, 1.4 times as long as high in profile and 0.8 times as high as broad. Vertex and ocellar tubercle black, both with black hairs. Ocelli and contiguous eyes brown, nearly bare, slightly darker in lower part, upper facets distinctly larger than lower. Frons shiny black; face black with some punctures and pale hairs, and a white lateral pollinose stripe on each side along eyes. Antenna dark brown to black, relative length of antennal scape, pedicel and flagellum (without arista) 3:5:10, relative width 7:9:10; arista about equal to length of rest of antenna. Occiput shiny black with some black hairs. Proboscis pale and palpus dark brown, both with some pale hairs.

Thorax (Figs 1, 2) mostly shining black, densely punctate and black haired; postpronotal callus, scutellar spines, postalar callus and narrow upper margin of anepisternum yellowish brown; length of scutellar spines only 1/4 as long as scutellum length. Wing black, stigma and veins darker than the mambrane, vein R₄ present. Legs mostly dark brown to black, but each femur and tibia with yellow base and apex, mid and hind tarsi 1 yellow; legs wholly with short pale hairs. Halter yellow with yellowish brown base.

Abdomen (Figs. 1, 2) about as long as thorax, shining black, densely punctate, tergites 1–2 with dense black hairs, tergites 3–5 only with sparse pale hairs; similar hairs on venter. Male terminalia: epandrium trapezoidal (Fig. 3), its base narrower than tip, apical margin with sparse short hairs; proctiger elongate-oval, genital capsule with high medial process at hind margin (Fig. 6); aedeagal complex (Figs. 4, 5) bilobate, each lobe narrowed and pointed apically.

Female. Unknown.

This new species is very similar to Oxycera qiana Yang et al. 2009. Both are black but the new species is slender, with the scape and pedicel black, the male eyes are only sparsely haired or bare, and the male terminalia are species-specific (Figs 3–6). Oxycera qiana is stouter, with a somewhat paler scape and pedicel and densely haired eyes. The male terminalia are of quite different shape (cf. Figs 7–11 in Yang et al. 2009), i.e. the genital capsule is narrowed distally and without a medial process, and the aedeagal complex is trilobate.

The species is named after the type locality Ningxia in the Hui Autonomous Region.

China (Ningxia).

♀, Ningxia Hui Autonomous Region, Jing Yuan County, Liupanshan natural reserves, Dongshanpo, 2100 m, N35^o36.767; E106^o16.189, 28.viii.2009, Z.-H. Yang leg.

Dark species without yellow stripes or spots on scutum (except postalar calli), eyes sparsely brown haired, legs mainly yellowish although femora mostly black. Abdomen with round yellow lateral markings on tergites 3 and 4 and a large central spot on tergite 1, and the posterior portion of tergite 5 yellow.

Male unknown.

Female (Figs 7–10). Length: body 6.3mm, wing 5.6 mm.

Head (Figs 7–8, 10) shining black with yellow pattern, 1.5 times as high as long in profile and 0.7–0.8 as high as broad in dorsal view. Frons with 3 pairs of medial pruinose yellow spots above antennae and a subtriangular yellow spot at eye margin on each side. Eyes sparsely short brown haired. Postocular rim with a oblong yellow spot on upper part and a pale subtriangular spot above postgena. Antenna (Fig. 9) yellowish brown, but scape and basal part of pedicel dark brown; relative lengths of antennal scape, pedicel and flagellum (without arista) 1:1.5:4, relative widths 5:7:9; arista about 0.9 times as long as rest of antenna. Face with white pollinose stripes along eye margin at each side. Hairs on head pale. Proboscis (Fig. 8) yellow, palpus dark brown, both pale haired.

Thorax (Figs. 7–8) shiny black. including postpronotal callus, scutum black, with whitish yellow hairs; postalar callus with a small subtriangular yellow anterior spot. Scutellum yellow, covered with sparse yellow hairs, spines yellow with dark tips; anepisternum with a narrow yellow stripe at upper margin from postalar callus to wing base; entire pleura with pale hairs. Legs: coxae and basal 4/5 of femora black, 3^rd to 5^th tarsomeres dark brown to black, rest of legs yellow to yellowish brown though tibiae slightly darkened at middle. Wing hyaline, veins pale yellow to brownish yellow, vein R₄ present. Halter yellow with dark brown base.

Abdomen (Figs. 7–8) shining black with following yellow pattern (Fig. 7): tergite 1 with a large central spot, tergites 3 and 4 each with a pair of yellow lateral spots, tergite 5 with yellow posterior margin. Dorsum densely punctate and sparsely haired; venter entirely black, entire abdomen pale haired.

This new species is similar to Oxycera dives Loew, 1845 and Oxycera locuples Loew, 1857 known from Europe, but it may be separated from both by the missing dorsolateral stripes on the scutum and the large central spot on tergite 1. Lateral markings on tergite 2 are absent in the new species (and usually also in Oxycera dives) but distinct in Oxycera locuples. Using the most recent key to species of Oxycera from China (Zhang et al. 2010) the new species runs to couplet 9 (R₄ present) but spines on the scutellum are not almost vertical.

The species is named in honor of Prof. Rudolf Rozkošný, a prominent Czech dipterist who contributed significantly to the knowledge of Palaearctic and Oriental Stratiomyidae.

China (Ningxia).