DURHAM DIPTERA. 207 



XXIX. 324. 



324. Oncomyia, Dsv. 



19 (20). Second antennal joint much longer than the third. 



(1636. atra, F.) 



20 (19). Second antennal joint scarcely longer than the third. 



(1637. pusilla, Mg.) 



21 (18). Antennae shorter than the frons ; frons wholly yellow, 



not black behind. 



325. Sicus, Scop. (1638. femiginetis, L,.) 



22 (17). Face much lengthened; jowls at least twice as long 



as the diameter of the eyes. 



326. Myopa, F. 



23 (28). Jowls hairy. 



24 (25). Jowls with two black dots behind ; X.4. not clouded. 



1639. Myopa buccata, L. 

 Harperley, 2 $ and 2 ?, June, 1900; Bollihope, 1 $, 

 June, 1 90 1. 



25 (24). Jowls unspotted; X.4. clouded. 



26 (27). Wings unspotted beyond the clouded X.4. 



(1640. testacea, L.) 



27 (26). Wings with several brown spots. 



(164 1. poly stigma, Rnd.) 



28 (23). Jowls bare. 



29 (30). Scutellum black. (1642. fasciata, Mg.) 



30 (29). Scutellum red-brown. (!643. dorsah's, F.) 



Family XXX. — CEstrid^;. 

 table of genera and species. 



1 (6). V.4. straight, not bent towards V.3. (V. 22). 



327. Gastrophilus, Leach. 

 Larvae parasitic in the stomach of the horse. 



2 (3). Wings with pale brown washed-out looking spots ; 



X.5 2 almost in a line with X.4. (V. 22). 



(1644. equt, F.) 



