Chrysotus thornpennis, 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 : 89-92

4.4 Chrysotus thornpennis sp. nov. ( Figs 2 , 6–8 )

Description. First flagellomere nearly subtrianglar, 1.5 times wider than long. All legs dark brown to black; all coxae and femora black; all tibiae and tarsi brown ( Fig. 2 ).

Male. Body length 2.0– 2.2 mm, wing length 1.8–2.0 mm.

Head metallic green with pale gray pollinosity; eyes contiguous on face. Hairs and bristles on head black, postocular bristles (including postero-ventral hairs) somewhat pale. Antenna dark brown to black, scape and pedicel black, flagellomere dark brown; first flagellomere nearly subtrianglar, 1.5 times wider than long; arista dark brown, short pubescent ( Fig. 6 ). Proboscis brown with brown hairs; palpus brown with 1 brown bristle.

Thorax metallic green with pale gray pollinosity. Hairs and bristles on thorax black; 6 dc (5 strong and anterior 1 weak), 4–5 irregularly paired acr short and hair-like; scutellum with 2 pairs of bristles, basal pair long, lateral pair short and hair-like; proepisternum with 1 long black bristle on lower part and 1 short black bristle on upper part.

All legs dark brown to black; all coxae and femora black; all tibiae and tarsi brown. Hairs and bristles on legs black. Fore coxa with long hairs; mid coxa with 1 bristle; hind coxa with 1 outer bristle at base and 1 short bristle at apex. Hind trochanter with 1 bristle at middle. All femora with row of av and row of pv. Fore tibia with 5–6 weak ad, a row of weak v; 3–4 bristles apically. Mid tibia with 2 strong ad at basal 1/4 and 1/2, 1 weak pd at basal 1/2; 3–4 bristles apically. Hind tibia with 2 ad at basal 1/5 and 2/5, 3–4 pd, 5–6 weak pv, a row of weak av; apically with 3–4 weak bristles. Relative lengths of tibia and 5 tarsomeres of legs I–III as follows: LI: 4.5: 2.3: 1.2: 1.0: 0.6: 0.6; LII: 5.7: 2.8: 1.5: 1.1: 0.7: 0.7; LIII: 6.5: 2.0: 1.7: 1.3: 0.8: 0.8.

Wing hyaline, somewhat tinged brown; veins blackish, R 4+5 and M parallel apically; CuAx ratio 0.3. Squama brown with black hairs. Halter pale yellow.

Abdomen metallic green with pale gray pollinosity; hairs and bristles on abdomen black. Male genitalia ( Figs 7–8 ): Epandrium somewhat rounded, without angular projection posteriorly. Apex of hypandrium nearly parallel with apex of

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

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

© Zoological Systematics, 40(1): 86–92 lateral epandrial lobe. Lateral epandrial lobe short and weakly protruded, bearing 3 setae. Surstylus wide at base. Cercus subtrianglar with moderated bristles. Phallus with 9–10 big spines, apex of phallus divide into 3 strip-liked structure.

Female. Body length 2.4–2.6 mm, wing length 2.2–2.3 mm. Similar to male, but eyes widely separated on face, hind tibia without a row of weak av.

Holotype ♂, China, Shanxi, Mt. Li, Shunwangping (35°23′N, 111°58′E; elev. 1900 m), 20 July 2013, coll. Shuai Su. Paratypes: 3♂, 2♀, China, Shanxi, Mt. Li, Zhuweigou Vallage (35°25′N, 111°59′E; elev. 1900 m), 29 July 2013, coll. Ting-Ting Zhang

Distribution. China (Shanxi).

Etymology. The specific epithet refers to the phallus with spines.

Remarks. The new species is similar to C. polaris Negrobov & Maslova, 2000 in the phallus with spines, but can be separated from the latter by the phallus with 9–10 big spines, and the apex of the hypandrium nearly parallel with the apex of the lateral epandrial lobe. In C. polaris , the phallus has 7 spines, and the hypandrium is far behind the apex of the lateral epandrial lobe (Negrobov & Maslova, 2000).

Funding The research was funded by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China (2012IK216). It is financially supported by the Special Fund for Agro-scientific Research in the Public Interest (201003025).

Acknowledgements We are grateful to Mr. Zhen-Hua Zhang ( China Agricultural University, Beijing, China), Dr. Ting-Ting Zhang (Shandong Agricultural University, Shandong, China) and Ms. Shuai Su ( China Agricultural University, Beijing, China) for collecting specimens. Two anonymous reviewers provided comments on an earlier draft of this paper.

Figures

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

Figs 6–8. Chrysotus thornpenis sp. nov., male. 6. First flagellomere, lateral view. 7. Genitalia, lateral view. 8. Apex of phallus, ventral view. Scale bars = 0.1mm.