304 DURHAM DIPTERA. 



XXXIV. 496. 



496. SCATOPHAGA, Mg. 



1 (33). Antennae distinctly plumose. 



2 (24). Third antennal joint red-brown or orange. 



3 (4). V.3. and V.4. distinctly converging; antennas and 



legs orange. (2220. scybalaria, L.) 



4 (3). V.3. and V.4. parallel. 



5 (14). Upper side of the femora with a dark stripe, at least 



the fore femora. 



6 (9). Hind femora without rows of bristles. 



7 (8). Fore and mid femora, and generally also the hind 



femora, with a distinct stripe on the outer side; 

 tip of the hind femora with only one bristle. 



(2221. tczniopa, Rnd., $) 



8 (7). Fore femora only with a brown stripe ; seldom the 



mid femora with a brown streak; generally two 

 distinct bristles at the tip of the hind femora. 



(2226. ordinata, Beck., $) 



9 (6). Hind femora with rows of bristles. 



10 (11). The fore and mid femora always, and often also the 



hind femora, distinctly striped. 



(2221. tceniopa, Rnd., ?) 



11 (10). Only the fore femora with a dark stripe; seldom the 



mid femora with a dark streak. 



12 (13). Yellowish grey species with fine pale-brown dorsal 



stripes ; acrostichal bristles more than two-rowed, 

 indistinctly arranged ; hind femora with a row of 

 about eight bristles. (2226. ordinata, Beck., $) 



13 (12). Yellowish brown species, partly blue-grey dusted ; 



dorsal stripes dark brown ; acrostichal bristles 

 in both sexes distinctly two rowed; hind femora 

 with a row of 4-5 bristles. (2225. macultpes, Ztt.) 



14 (5). Femora without dark stripes. 



15 (18). Hind femora without rows of bristles. 



16 (17). X.4. and X.5 2 distinctly clouded. (2222. suilla, F., $) 



17 (16). X-veins not clouded. (scatomyzoides, Ztt., $) 



18 (15). Hind femora with rows of bristles. 



