Amblypsilopus liangi, 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 : 10-11

Amblypsilopus liangi sp. nov.

( Figs 2 , 11 )

Diagnosis. Coxae all yellow expect mid coxae with 1 short black stripe. Cercus black, broadly expanded basally; both branches with strong marginal bristles ventrally; ventral branch wide but extremely short; dorsal branch rodlike, 1.2 times as long as epandrium, with 3 apical digitations, each with 1 long strong apical bristle as long as cercus. Phallus mostly pale but with a dark, blunt, convex apex.

Description. Male ( Fig. 2 ). Body length 3.0 mm, wing length 3.0 mm. Head brightly metallic green with grey pollinosity. Hairs and bristles on head black except middle and lower postocular bristles including posteroventral hairs pale, with dense black bristles on lateral frons. Ocellar tubercle with 2 long strong oc and 2 posterior hairs. Antenna dark brown; postpedicel subtriangular, blunt at tip, nearly as long as wide; pedicel rounded with circlet of apical bristles; arista-like stylus subapical, black, nearly bare, 1.5 times as long as head, basal segment less than 0.1 times as long as apical segment. Proboscis yellow with black apical bristle; palpus very small, yellow, with 2 short apical bristles. Thorax brightly metallic green with pale grey pollinosity. Hairs and bristles on thorax black; 5 dc, of which only posterior 2 very long; 3 biseriate long bristle-like acr; 2 sc, lateral pair short, median pair half as long as scutum. Legs mainly yellow, mid coxa with 1 short black stripe, fore tarsus black from apex of tarsomere II onward, mid and hind tarsomeres II–V black. Hairs and bristles on legs mainly black except bristles on coxae pale, ventral hairs and bristles on femora pale. Fore coxa with 1 long strong outer bristle close to dorsum, with thick marginal hairs and 2 strong preapical marginal bristles; mid and hind coxae each with 1 long spinous outer bristle at middle. Fore femur with 1 weak av at apical 1/8 and 1 weak curved preapical av; mid femur with 1 weak preapical av, hind femur without distinct bristles. Fore tibia with 1 preapical av. Mid tibia with 1 av at middle and 1 preapical ad. Hind tibia with row of 10 pd, row of 6 weak av, 2 apical bristles. Fore tarsomere I with rows of dense erect ventral bristles. Hind tarsomeres III–V somewhat flat. Relative length ratio of tibiae and tarsomeres: LI 6.0: 4.5: 3.3: 2.0: 2.1: 1.0; LII 12.0: 10.5: 3.6: 1.8: 1.5: 1.0; LIII 19.5: 10.0: 4.2: 1.8: 1.5: 1.2. Wing hyaline, veins dark brown. Crossvein dm-cu nearly straight, CuAx ratio 1.5. Lower calypter blackish with long pale hairs. Halter pale. Abdomen straight, pale metallic green with thin pale gray pollinosity. Hairs and bristles on abdomen black except segment I with 8 irregular long basal bristles. Hypopygium ( Fig. 11 ): Epandrium longer than wide in lateral view; epandrial lobe almost indistinct, only left 2 digitations each with 1 long strong apical bristle; surstylus simple, digitiform, slightly narrowed at middle, with 3 weak hair-like apical bristles. Cercus black, broadly expanded basally; both branches with strong marginal bristles ventrally; ventral branch wide but extremely short; dorsal branch rod-like, 1.2 times as long as epandrium, slightly expanded apically, with 3 apical digitations, each with 1 long strong apical bristle as long as cercus. Hypandrium simple. Phallus mostly pale, with dark, blunt, convex apex.

Female. Unknown.

Type material. HOLOTYPE ♂, labelled: China. Tibet: Nyingchi, Medog [N29°45′ E95°30′], 763 m, 2018. VI.25, sweep nets, Liang Wang (CAU).

Distribution. China (Tibet).

Remarks. The new species was collected in in broad-leaf forests. It is somewhat similar to A. subabruptus Bickel & Wei and A. abruptus (Walker) , which both are widespread in China, but may be separated from the latter two by the shape of the cercus. In the latter two species, the cercus is simply filiform, not expanded at base and the tip is narrow ( Bickel & Wei 1996; Yang et al. 2011, figs 49 & 71).

Etymology. The species is named after the collector Liang Wang.

Figures

FIGURES 1–4. 1. Amblypsilopus acuminatus sp. nov.; 2. Amblypsilopus liangi sp. nov.; 3. Amblypsilopus liratus sp. nov.; 4. Amblypsilopus marginatus sp. nov. All males. Scale bar = 1.0 mm.

FIGURES 10–12. Male hypopygium, lateral view. 10. Amblypsilopus acuminatus sp. nov.; 11. Amblypsilopus liangi sp. nov.; 12. Amblypsilopus liratus sp. nov. Scale bar = 0.2 mm. Abbreviations: epn = epandrium, hyp = hypandrium, ph = phallus, sur = surstylus, lat = lateral lobe, cer = cercus.