56 DURHAM DIPTERA. 



VI. 80. 



25 (24). Femora with dark ends. (5*8. latus, Mg.) 



26 (22) (23). Thorax white with red stripes, fore legs white. 



(519. dubius, Staeg.) 



27 (13). Legs with many black and yellow rings. 



28 (29). Fore tarsi of the male bare. (5 21 - monilis, L.) 



29 (28). Fore tarsi of the male bearded. (522. phatta, Egg.) 



30 (12). Wings plain, not spotted nor banded. 



31 (32) (33). Grey species with brown antennae, size 6 mm. 



Abdomen with three rows of dark spots. 



(524. notatus, Mg.) 



32 (31) (33). White species with yellowish thoracic stripes, 



white antennae, size 4 mm., abdomen plain whitish. 

 Tany pus melanops, Mg. 

 Belburn, 1 $ , May, 1900. 



33 (31) (32). Pale reddish species, with red stripes and pale 



antennae, size 3 mm. (526. ferrugineicollis, Mg.) 



82. Ceratopogon, Mg. 



This genus also I know nothing about, but I have extracted 

 the following from Schiner and others in the hope that it may 

 give some slight indication of the specific characters. The 

 larvae live beneath the bark of decaying trees, in manure, and 

 in water. 



1 (92). X.3. present, joining V.3. and V.I., there are there- 



fore two 0.3s. (It must be borne in mind that 

 V.2. is absent in this genus). 



2 (23). V.3. ending in the fore margin before or only a little 



after the middle of the wing. 



3 (14). Metatarsus not longer than the next tarsal joint. 



4 (9). V.3, ending before the middle of the fore margin. 



5 (6). Dorsum with yellow hairs. Wings dusky with a 



white spot on the costa, beyond the end of V.3. 



(543. bipunctatus, L.) 



6 (5). Dorsum all black haired. 



7 (8). Wings milk-white, black or dark brown species, tarsi 



paler. (533. niger, Winn.) 



