Chrysosoma Guérin-Méneville, 1831

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 : 17

Genus Chrysosoma Guérin-Méneville, 1831

Species of Chrysosoma are characterized by the following features: Body often relatively stout with bristly legs. Head with strongly excavated vertex; strong posteroventral bristle present, in line with postocular series; male frons usually with group of fine bristles or with weak vt; female frons with strong vt; postpedicel of both sexes usually elongate isosceles triangular, symmetrical with apical arista-like stylus; arista-like stylus usually long, about two-thirds body length or longer in males, about half body length in females; male antenna often variously modified. Thorax with 3–5 pairs of strong acr; male usually with 2 strong posterior dc and only weak hair-like anterior dc; female usually with 5 strong dc; lateral sc weak or absent, or sometimes even lost. Legs: Fore femur usually with strong ventral bristles; fore tibia usually with strong dorsal bristles. Wing usually hyaline but sometimes with brown maculation; crossvein dm-cu usually sinuated, if straight, it makes an acute angle with vein M. Hypandrium with narrow left lateral arm. Phallus with dorsal angle. Epandrial lobe with 2 strong apical bristles. Surstylus with large ventral process and digitiform dorsal process. Cercus often bifurcated ( Bickel 1994; Yang et al. 2011).

Chrysosoma is a large genus, with more than 200 species but only distributed in Old World, of which ten species are recorded in the Himalayan region ( Yang et al. 2006, Wang et al. 2014). No new species or new species records were discovered during this study. Nyingchi is the only Tibetan location where Chrysosoma is recorded. A key to species of male Chrysosoma in the Himalayan region is provided below. Chrysosoma bifiguratum Becker is not included because the record of this species from the Himalayas is based on a female specimen.