DURHAM DIPTERA. 305 



XXXIV. 496. 



19 (20) (21). Both X-veins distinctly clouded. {siiilla, F., ?) 



20 (19) (21). Only X.4. clouded; antennae orange with the 



upper edge and tip brown ; abdomen of the male 

 mostly all yellow and chiefly yellow haired ; little 

 slender species. (2227. analis, Mg.) 



21 (19) (20). Neither X.4. nor X.5 2 clouded. 



22 (23). Humeri and scutellum of the same colour as the 



thorax; abdomen of the male yellow at the tip 

 and long brown haired, of the female yellow with 

 black incisions ; a little dark brown-grey species, 

 sometimes with bluish grey dusting. 

 2224. Scatophaga inquinata, Mg. 

 Bishop Auckland, 3 $ and 3 ?, May-July, 1900. 



23 (22). Humeri yellow ; scutellum always in the male, and 



generally in the female yellow ; femora very strong; 

 wings bright orange at the base; large species, 

 generally yellow-grey dusted. 



2228. Scatophaga lutaria, F. 

 Common everywhere. 



24 (2). Third antennal joint black. 



25 (28). Hind tibiae with from 11-13 bristles on the outer side; 



X.4. distinctly clouded. 



26 (27). Hairs of the legs and abdomen in the male pale 



yellow, and not very long ; acrostichal bristles dis- 

 tinctly two-rowed ; face in both sexes dirty yellow ; 

 wings evenly coloured dirty yellow-brown. 



2229. Scatophaga ??ierdaria, F. 

 Common. 



27 (26). Hairs of the legs and abdomen of the male long and 



woolly, and generally golden yellow ; acrostichal 

 bristles in the male more than two-rowed ; head in 

 both sexes orange or golden yellow; wings with 

 the base and fore margin bright orange. 



Mr. Verrall considers this and the foregoing (merdaria, F.) to 

 be the same species. 



2229. Scatophaga stercoraria, L. 



Very common everywhere. 



