DTJKHAM DIPTEEA. 28 1 



XXXIII. 474. 



43 (42). Eyes touching ; hind under side of hind femora with 



a row of long bristles before the tip ; squamae 

 and halteres sometimes dark. 



(2146. umbrosa, Stein) 



44 (33). Mid metatarsus without a thorn. 



45 (48). Mid tibiae inner side with a distinct tubercle. 



46 (47). Tubercle before the middle of the mid tibiae. 



(tvberculata, Ztt.) 



47 (46). Tubercle beyond the middle. 



2147. Homalomyia coracina, Lw. 

 Shull, 1 $, September, 1900. 



48 (45). Mid tibiae without a tubercle, at most the end some- 



what thickened. 



49 (50). Hind femora beneath immediately before the tip 



with an isolated tuft of hairs. 



(2148. kowarzii, Verr.) 



50 (49). Hind femora without any hair tuft. 



51 (52). The last third of the mid tibiae inner side distinctly, 



though not greatly thickened. 



(2149. verrallii, Stein) 



52 (51). The mid tibiae quite straight on the inner side, or 



more than the last third slightly thickened. 



53 (64). Squamae rather small ; scales of equal size. 



54 (55). Hind tibiae outer side without a praeapical bristle. 



(2 1 5 1. sociella, Ztt.) 



55 (54). Hind tibiae with praeapical bristle. 



56 (57). Hind femora front under side from middle to tip with 



a row of long hairs, increasing in length towards 

 the tip. (2150. fiostica, Stein) 



57 (56). Hind femora either quite bare at this place, or with 



two or three long bristles just before the tip. 



58 (59). Squamae entirely pale yellow ; abdominal centre line 



only slightly triangularly thickened on each seg- 

 ment. (2152. similis, Stein) 



59 (58). Squamae deep black, or at least brownish yellow ; 



abdominal central spots triangular. 



60 (61). Squamae and halteres deep black, (carbonella, Stein) 



