Chrysotus shanxiensis, Liu & Wang & Yang, 2015

Liu, Ruo-Si, Wang, Meng-Qing & Yang, Ding, 2015, Chrysotus Meigen (Diptera: Dolichopodidae) from Shanxi, China, with descriptions of two new species, Zoological Systematics 40 (1), pp. 86-92 : 88-89

4.3 Chrysotus shanxiensis sp. nov. ( Figs 1 , 3–5 )

Description. First flagellomere subtriangular, 1.4 times wider than long. Base and apex of fore and mid femora yellow, especially ventral side with more yellow at base and apex, hind femur yellow at basal 1/2; fore and mid tibiae yellow, hind tibia yellow with brown apex ( Fig. 1 ).

Male. Body length 1.7–2.2 mm, wing length 1.5–2.0mm.

Head metallic green with pale gray pollinosity; eyes contiguous on face. Hairs and bristles on head black except postero-ventral hairs pale. Antenna brown; first flagellomere subtriangular, 1.4 times wider than long; arista brown, short pubescent ( Fig. 3 ). Proboscis brown with pale hairs; palpus brown with 1 dark yellow bristle at apex.

© Zoological Systematics, 40(1): 86–92

Thorax metallic green with pale gray pollinosity. Hairs and bristles on thorax black; 6 dc (5 strong and anterior 1 weak), 6–7 irregularly paired acr short and hair-like; scutellum with 2 pairs of bristles, basal pair short and hair-like, lateral pair long; proepisternum with 1 long black bristle on lower part and 1 short black bristle on upper part.

Legs mainly brown except all trochanters yellow; base and apex of fore and mid femora yellow, especially ventral side with more yellow at base and apex, hind femur yellow at basal 1/2; fore and mid tibiae yellow, hind tibia yellow with brown apex. Fore and mid tarsomere 1 and base of tarsomere 2 yellow, base of hind tarsomere 1 yellow. Hairs and bristles on legs black. Fore coxa with long hairs, hind coxa with 1 outer bristle at base. Hind trochanter with 1 bristle at middle. Fore femur with 4 pv, mid femur with 2–3 pv, hind femur with 3 av. Fore tibia with 1 ad at basal 1/4, apically with 3 short bristles. Mid tibia with 2 strong ad at basal 1/5 and 3/5, with 2 weak pd at basal 1/5 and 3/5; apically with 4 bristles. Hind tibia with row of av and 3 ad; apically with 3–4 bristles. Hairs on apical of hind tibia and hind tarsomere 1 dense and long. Relative lengths of tibia and 5 tarsomeres of legs I–III as follows: LI: 4.5: 2.0: 1.2: 0.7: 0.5: 0.5; LII: 5.5: 2.8: 1.5: 1.0: 0.5: 0.5; LIII: 5.5: 2.0: 1.5: 1.0: 0.6: 0.5.

Wing hyaline; veins blackish, R 4+5 and M parallel apically; CuAx ratio 0.25. Squama yellow with brown hairs. Halter pale yellow.

Abdomen metallic green with pale gray pollinosity; hairs and bristles on abdomen black. Male genitalia ( Figs 4–5 ): Epandrium somewhat rounded, without angular projection posteriorly. Lateral epandrial lobe protruded and wide. Surstylus somewhat long and curved, with acute end. Cercus short and wide, with moderated bristles. Apex of phallus with 2 fin-liked structure.

Female. Body length 2.0– 2.4 mm, wing length 1.9–2.2 mm. Similar to male, but eyes widely separated. Hind tibia entirely yellow. Hairs on apical of hind tibia and hind tarsomere 1 normal.

Holotype ♂, China, Shanxi, Qinshui, Xiachuan (35°48′N, 112°16′E, elev. 772 m), 27–31 July 2012, coll. Zhen-Hua Zhang. Paratypes: 5♂, 5♀, same data as holotype .

Distribution. China (Shanxi).

Etymology. The specific epithet refers to the locality of the holotype, Shanxi.

Remarks. The new species is similar to C. motuoensis Liu & Yang, 2013 in the male genitalia and antenna, but can be separated from the latter by the fore tibia with 1 ad at basal 1/4 and the apex of phallus with 2 fin-liked structures. In C. motuoensis , the fore tibia has no ad and the apex of phallus has 2 sheet-liked structures (Liu & Yang, 2013).

Figures

Figs 1–2. Habitus photographs. 1. Chrysotus shanxiensis sp. nov., male. 2. Chrysotus thornpenis sp. nov., male. Scale bars=0.5mm.

Figs 3–5. Chrysotus shanxiensis sp. nov., male. 3. First flagellomere, lateral view. 4. Genitalia, lateral view. 5. Apex of phallus, ventral view. Abbreviations: cer, cercus; epn, epandrium; hyp, hypandrium; lel, lateral epandrial lobe; pg, postgonite; ph, phallus; sur, surstylus. Scale bars = 0.1mm.