378 NEW YORK STATE MUSEUM 



visible only in certain lights. Pleura also with a whitish re- 

 flection; abdomen with silvery white spots on the second and 

 on the last two segments, wanting in rubbed specimens; the 

 posterior margin of the first segment with long and dense 

 brownish cilia. Head black, face grayish white; antennae and 

 palpi brownish black, the former more slender than is usual 

 with the members of this genus, with whitish reflections on 

 some parts. Legs dark brown; front coxae yellowish, fore 

 tibiae silvery white outwardly; middle tibiae yellow at the base, 

 hind tibiae likewise, though in less degree, light brown, with a 

 whitish reflection; metatarsi of the hind legs yellowish at the 

 base; the hairs of the fore and hind femora, and particularly 

 on the extensor surface of the hind tibiae, conspicuous. Hal- 

 teres bright yellow; wings purely hyaline, with delicate and 

 transparent veins, those of the anterior margin being somewhat 

 thicker and more conspicuous; the wing surface with a golden 

 brown reflection; the media not petiolate. The short, scattered 

 hair of the thorax seldom distinct, the color of the legs variable 

 in intensity. 



Female. In coloring does not resemble the male in the least. 

 The ground color is blackish brown; the dorsum of the thorax 

 covered with a depressed yellow pile, on the margins with a 

 whitish reflection, on the center with a grayish reflection, the 

 pleurae grayish white. Abdomen somewhat shining; on the 

 sides whitish or yellowish gray; on the venter, at least at the 

 base, in living specimens, yellow, which is continued around on 

 the dorsum in some specimens, usually not distinct in dried 

 specimens. Legs brown, usually paler than those of the male; 

 the tibiae, with the exception of the tip, and the fore coxae whit- 

 ish or yellowish white, the tips of the tibiae and the tarsi black, 

 the basal half of the hind metatarsi and sometimes also the 

 extreme base of the following joint yellowish. Front and face 

 gra}'; antennae and palpi brown, the former paler at the base. 

 In other particulars as with the male. Length 2 to 3mm. 

 Translation from Schiner, Fauna Atistriaca, 2:365 



According to Schiner [loc. cit.] this is the species whose life 

 history has been described by Fries, Westwood and Heeger. 

 According to Schiner also, sericea is a synonym of rep- 

 tans. Of sericea Westwood writes that the larva pos- 

 sesses three unbranched blood gills, and that the pupa has 

 eight thoracic respiratory filaments on each side. 



This European species has been reported by Lundbeck as 

 occurring in Greenland. (Diptera groenlandica, 1898) 



