Diaphorus nigripedus, Liu, Ruosi, Wang, Mengqing & Yang, Ding, 2015

Liu, Ruosi, Wang, Mengqing & Yang, Ding, 2015, Three new species of Diaphorus Meigen (Diptera: Dolichopodidae) from Tibet, Zootaxa 3946 (2), pp. 233-240 : 238-239

Diaphorus nigripedus sp. nov.

( Figs 4 , 8 , 12 )

Diagnosis. Eyes approaching but not contiguous on frons. All legs black ( Fig. 4 ). Ventral lobe of surstylus with wide base and thin apex, with 1 large bristle at middle.

Description. Male. Body length 2.5–3.0 mm, wing length 2.6–3.1 mm. Head metallic green, with pale gray pollinosity. Ocellar tubercle distinct, with pair of oc. Eyes approaching but not contiguous on frons; face rather wide with parallel lateral margins. Hairs and bristles on head black; postocular bristles (including posterior ventral hairs) somewhat pale. Antenna black; first flagellomere black, subtriangular, about 1.8 times wider than long; arista dark brown, short pubescent, with short basal segment ( Fig. 8 ). Proboscis brown with dark yellow hairs; palpus brown with 1 black long bristle at apex and 4–5 bristles. Thorax metallic green, with pale gray pollinosity. Mesonotum and scutellum brilliant metallic green with pale gray pollen. Hairs and bristles on thorax black; 5 strong dc, 6–7 irregularly paired acr. 1 long humeral bristle, 2 npl; scutellum with 2 pairs of bristles. Proepisternum with 1 long black bristle on lower part and 1 short black bristle on upper part. All legs black. Hairs and bristles on legs black. Fore coxa with more than 10 anterior hairs and bristles; mid coxa with 5–6 short anterior bristles; hind coxa with 1 outer bristle at base. Fore femur with rows of av. Mid tibia with 2 ad at basal 1/3 and 2/3, 2 pd at basal 1/4 and 3/5, apically with 3–4 bristles; hind tibia with 2 ad at basal 1/4 and 1/2 (latter one relatively weak), 6–8 pd, apically with 3–4 bristles. All tarsi without claws; pulvilli enlarged, shorter than tarsomere 5. Relative lengths of tibia and 5 tarsomeres of legs LI 5.0: 2.7: 1.3: 0.9: 0.7: 0.7; LII 6.0: 3.0: 1.6: 1.1: 0.7: 0.8; LIII 7.0: 2.5: 1.9: 1.3: 0.9: 0.9. Wing hyaline, tinged brown; veins dark brown, R4+5 and M1 nearly parallel apically; CuAx ratio 0.35. Squama black with black hairs. Halter black. Abdomen brownish black, with pale gray pollinosity; hairs and bristles on abdomen black. Tg1–5 with row of long bristles on posterior margin; st8 with 5 strong bristles. Male genitalia ( Fig. 12 ): Epandrium about as long as wide; lateral epandrial lobe wide and long, apex bearing 2 long bristles; ventral lobe of surstylus with wide base and thin apex, with large bristle at middle; dorsal lobe of surstylus short and straight, with 1 bristle at apex; cercus short and round; apex of phallus thin. Female. Unknown.

Specimens examined. HOLOTYPE ♂, China, Tibet, Gongbujiada, Bahe, 29°87′N, 93°67′E, 3122 m, 2013. VII.15, X.Y. Liu. PARATYPE: 1♂, same as holotype; 2♂, China, Tibet, Motuo, 80K, 29°33′N, 95°32′E, 1000 m, 2013. VIII.12, G. Yao; 5♂, China, Tibet, Linzhi, Namaicun, 29°73′N, 94°73′E, 3200 m, 2012. VIII.5, W.L. Li.

Distribution. China (Tibet).

Remarks. The new species is similar to Diaphorus jinghongensis Wang, Yang & Grootaert in the similar wide and long lateral epandrial lobe and 1 large bristle at middle of the ventral lobe of surstylus, but can be separated from the latter by the first flagellomere widest at middle. In D. jinghongensis , the first flagellomere is wider at lower part ( Wang et al. 2006).

Etymology. The specific epithet refers to the black legs of the species.

Figures

FIGURES 1 – 4. Habitus, lateral view (male). 1. Diaphorus anatoli; 2. Diaphorus baheensis sp. nov.; 3. Diaphorus longrenensis sp. nov.; 4. Diaphorus nigripedus sp. nov. Scale bars = 1 mm.

FIGURES 5 – 8. Antenna, lateral view (male). 5. Diaphorus anatoli; 6. Diaphorus baheensis sp. nov.; 7. Diaphorus longrenensis sp. nov.; 8. Diaphorus nigripedus sp. nov. Scale bars = 0.2 mm.

FIGURES 11 – 12. Genitalia, lateral view, (male). 11. Diaphorus longrenensis sp. nov.; 12. Diaphorus nigripedus sp. nov. Scale bars = 0.1 mm. Abbreviations: cer, cercus; epn, epandrium; dsur, dorsal lobe of surstylus; hyp, hypandrium; lel, lateral epandrial lobe; pg, postgonite; ph, phallus; vsur, ventral lobe of surstylus.