Il6 DUEHAM DIPTEEA. 



XXIII. 192. 



10 (9). Male tibiae with only a few bristles, not ciliated. 



Wings of the female of normal shape. Grey -black 

 species. (102 1 optica, F.) 



11 (2). Small species, 5 mm., mostly 4 mm. 



12 (19). V.4. not reaching the margin. 



13 (14). Halteres black. 



1039. Empis vitripennis, Mg. 

 Shull, 1 $, September, 1900. 



14 (13). Halteres white or yellow. 



15 (16). Fore metatarsus thickened in the male. Neither the 



tibiae nor the femora feathered in the female. 



(1038. albmervis, Mg.) 



16 (15). Fore metatarsus not thickened in the male. Tibiae 



or femora feathered in the female. 



17 (18). Hind femora only, feathered in the female. 



{hyalipennis, Fin.) 



18 (17). Mid femora, hind femora, and hind tibiae feathered 



in the female. ( io 37« albtpennis, Mg.) 



19 (12). V.4. quite reaching the margin. 



20 (21). Halteres black. Fore and hind metatarsi thickened. 



Hind tibiae dilated in the female, outer side ciliated. 

 1043. Empis chioptera, Fin. 

 Bishop Auckland, 2 £, May, 1900. 



21 (20). Halteres pale. 



22 (25). Legs yellow, or orange. 



23 (24). Legs of the female not plumed. (1047. grtsea, Fin.) 



24 (23). Mid femora, hind femora, and hind tibiae of the 



female plumed. (1034. pennaria, Fin.) 



25 (22). Legs black or dark brown. 



26 (29). Dorsum shining black, unstriped. 



27 (28). Wings brown. Legs black, in the male feathered as 



in 31. pennipes, L., (1033) 



28 (27). Wings clear. Legs brown, tarsi and tips of tibiae 



black. (1030* nigritarsis, Mg.) 



29 (26). Dorsum grey or dark brown, traces of stripes. 

 80 (33). Legs with scale-like hairs, ue., feathered. 



