Chrysotus Meigen, 1824

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 : 87

3 Genus Chrysotus Meigen, 1824

Chrysotus Meigen, 1824: 40 . Type species: Musca nigripes Fabricius, 1794 .

Diagnosis. The genus can be distinguished from other genera in the Diaphorinae by the following characters: body small to median-sized, metallic green; males and females with frons wider than face, occasionally males holoptic or nearly so; face parallel-sided or narrowing downward; eyes shortly haired; male eyes very narrowly separated or contiguous on face (sometimes widely separated), with enlarged facets toward face; arista long, located at tip; propleuron with 2–3 bristles on lower part, and upper part bare; R 4+5 and M parallel apically. Male genitalia: surstylus not branched, apically with short hairs and (or) 1 spine-like bristle; epandrial lobe long and broad; cercus small. Some species of the genus are similar to Diaphorus and Dubius , but can be separated from the others by the fr/fa (frons/face ratio)> 1.0 and arista located at tip ( Yang et al., 2011; Wei, 2012b).

Remarks. Yang et al. (2006) provided a list of synonymy of the genus.

Key to species (males) of Chrysotus from Shanxi

1. Epandrium with characteristic angular projection posteriorly ( Chrysotus laesus -group sensu Wei & Zhang (2010)) .........................2

Epandrium without characteristic angular projection posteriorly (unknown species group)................................................................ 3 2. Apex of phallus with row of denticulate processes .............................................................................................................. C. serratus

Apex of phallus with two lateral lobes bluntly round................................................................................................... C. biprojicienus 3. Phallus with 9–10 big spines.............................................................................................................................. C. thornpenis sp. nov.

Phallus without spines.......................................................................................................................................................................... 4 4. Mid tibia with 1 ad at basal 1/5 ............................................................................................................................................... C. suavia

Mid tibia with 2 ad...............................................................................................................................................................................5 5. Hypandrium behind apex of lateral epandrial lobe............................................................................................................................... 6

Hypandrium far protruded apex of lateral epandrial lobe ...................................................................................................................7 6. Hind tibia yellow with brown apex; epandrium rounded posteriorly ................................................................ C. shanxiensis sp. nov.

Hind tibia black; epandrium with sunk part posteriorly .................................................................................................... C. femoratus 7. Apex of phallus bifid; mid tibia with 1 pd ....................................................................................................................... C. gramineus

Apex of phallus not bifid...................................................................................................................................................................... 8 8. Fore coxa yellow; apex of phallus with hollow....................................................................................................................... C. cilipes

Fore coxa pale black; apex of phallus without hollow ..................................................................................................... C. pulchellus