Sciapus zewoiensus, Tang & Zhu & Yang, 2019

Tang, Chufei, Zhu, Yajun & Yang, Ding, 2019, Sciapodinae from the Himalayan region with description of nine new species from Tibet (Diptera: Dolichopodidae), Zootaxa 4577 (1), pp. 1-28 : 25-26

Sciapus zewoiensus sp. nov.

( Figs 9 , 18 )

Diagnosis. Thorax with 6 strong dc and 8 pairs of acr. Legs mainly yellow except mid and hind coxae black. Surstylus with enlarged and bifurcated apex, ventral branch enlarged toward tip, with 3 peg-like apical bristles. Cercus digitiform, yellow basally but brown at apical 5/6. Hypandrium and phallus 1.5 times as long as epandrium.

Descriptions. Male ( Fig. 9 ). Body length 4.5 mm, wing length 4.2 mm. Head metallic green with greyish pollinosity. Vertex slightly sunken. Hairs and bristles black including middle and lower postocular bristles and posteroventral hairs. One short vt, prominent ocellar tubercle with 1 strong oc. Antenna black except venter of scape yellow. Scape elongated. Postpedicel short, nearly as long as wide, triangular, blunt apically, with black dorsal arista-like stylus 3/5 as long as head width. Proboscis black with black hairs; palpus black with black bristles. Thorax metallic green with greyish pollinosity. With 6 strong dc and 8 pairs of acr; 2 pairs of sc, of which basal pair weak hair-like, apical pair strong. Legs mainly yellow except mid and hind coxae black. Hairs and bristles mainly black. Fore coxa with some dorsal bristles, 1 outer pale bristle and 2 preapical spinous pale bristles. Mid coxa with row of long, thin pale dorsal bristles. Hind coxa with 1 outer bristle at middle. Fore femur without distinct bristle, with row of 5 pale, long (2.0 times as long as width of fore femur) spinous ventral bristles. Mid femur without distinct bristle. Hind femur with 1 weak preapical av. Fore and mid tibiae without distinct bristles. Hind tibia with row of short spinous ad. Relative length ratio of tibiae and tarsomeres: LI 3.0:?:?:?:?:?; LII 4.3:?:?:?:?:?; LIII 6.5:?:?:?:?:? (tarsi all lost). Wing hyaline, veins dark brown. Crossvein dm-cu nearly straight, CuAx ratio 0.8. Lower calypter pale with pale hairs. Halter pale. Abdomen metallic green. Hairs and bristles on abdomen black. Hypopygium ( Fig. 18 ): Epandrium slightly longer than wide in lateral view; epandrial lobe square, narrowed at tip, with 2 weak apical bristles. Surstylus with enlarged and bifurcated apex, ventral branch enlarged toward tip, with 3 peg-like apical bristles; dorsal branch wider than ventral branch, with 3 long, pale apical bristles and 3 short apical bristles. Cercus digitiform, yellow basally, brown at apical 5/6, with long pale sparse marginal bristles ventrally and dense marginal bristles dorsally. Hypandrium simple, 1.5 times as long as epandrium; phallus hidden in hypandrium, simple.

Female. Unknown

Type material. HOLOTYPE ♂, labeled: China. Tibet: Qamdo, Markam, Zewo [N29°54′06″ E98°27′59″], 3508 m, 2013. VII.5, sweep nets, Xiaoyan Liu (CAU).

Distribution. China (Tibet).

Remarks. The holotype was collected when sweeping bushes along mountain trails. The new species is similar to S. arctus from Taiwan ( China), but with black mid and hind coxae plus an unornamented hypandrium. In the latter species, the legs are wholly yellow and the hypandrium is lobately expanded apically ( Becker 1922).

Etymology. The species is named after the type locality.

Figures

FIGURES 8–9. 8. Plagiozopelma trilobata sp. nov.; 9. Sciapus zewoiensus sp. nov. All males. Scale bar = 1.0 mm.

FIGURES 16–18. Male hypopygium, lateral view. 16. Plagiozopelma fornicata sp. nov.; 17. Plagiozopelma trilobata sp. nov.; 18. Sciapus zewoiensus sp. nov. Scale bar = 0.2 mm. Abbreviations: epn = epandrium, hyp = hypandrium, ph = phallus, sur = surstylus, lat = lateral lobe, cer = cercus.