DURHAM DIPTERA. 57 



VI. 82 



8 (7). Wings grey. (539. myrmecophilus, Egg.) 



9 (4). V.3. ending at or a little beyond the middle of fore 



margin. 



10 (11). Dorsum shining black. Tibiae fringed with pointed 



lancet-like scales. (537- czliatus, Winn.) 



11 (10). Dorsum dark grey, the humeri orange. 



12 (13). Coxae whitish yellow. (53^. kaltenbachii, Winn.) 



13 (12). Coxae pitch-brown or black. (536. fiiceus, Winn.) 



14 (3). Metatarsus distinctly longer than the next joint. 



15 (20). Legs black-haired. 



16 (17). Dorsum with short yellow and long black hairs. All 



femora and tibiae thickened. 



(540. crassifies, Winn.) 



17 (16). Dorsum with all black or greyish hairs, or almost 



bare. 



18 (19). Dorsum shining black, nearly bare with few black 



hairs. Abdomen and legs shining black and 

 black haired. (54 1 - brevipennis, Mcq.) 



19 (18). Dorsum deep black, with black hairs, grey in some 



lights. Abdomen with greyish white shimmering 

 hairs. Legs pale brown. (54 2 - alacer, Winn.) 



20 (15). Legs pale yellow-haired. 



21 (22). Dorsum and scutellum shining black. Abdomen 



dark grey-haired. (544- titillans, Winn.) 



22 (21). Dorsum matt grey. Scutellum all orange, or at least 



the margin. Abdomen with long pale yellow hair. 



(543. murinus, Winn.) 



23 (2). V,3, always ending considerably beyond the middle 



of the fore margin, and often near the wing tip. 



24 (64). Wings hairy, at least at the tip. 



25 (38). Claws with distinct footpads. 



26 (29). Legs pale yellow. 



27 (28). Wings hairy on more than just the wing tip. Dorsum 



with short whitish hair. (547- lucorum, Mg.) 



28 (27). Wings only hairy at the tip. Dorsum with fine small 



yellow hairs. (55 2 « tninutus, Mg.) 



29 (26). Legs pitch-brown or orange. 



