224 DURHAM DIPTERA. 



XXXI. 349. 



4 (3). Discal abdominal bristles present on the middle 



segments. 



5 (6). Lower fronto-orbital bristles extending over the cheeks 



beyond the middle to near the mouth. 



(17 1 9. rustic a, Mg.) 



6 (5). Lower fronto-orbital bristles not extending beyond the 



middle of the cheeks. (1722. nigricans , Egg.) 



349^. (Baumhaueria, Mg.). 



1 (2). Discal abdominal bristles absent from the middle 



segments. 349. Tachina (17 17. grandis, Egg.) 



2 (1). Discal abdominal bristles present on the middle 



segments. 



3 (4). Scutellum wholly or partly yellow. 



352. Thelymorpha, Br.&Berg.(i732.7w//^V/^(7,Fln.) 



4 (3). Scutellum wholly black. 



344. Phorocera (1699. gracilis, Egg.) 



353. Gonia. 



(4). Abdomen black or grey, at most with red-brown sides 

 at the base. 



2 (3). Abdomen shining black without white shimmering 



bands. . (1730. foersteri, Mg.) 



3 (2). Abdomen black with white shimmering bands. 



(1727. fasciata, Mg.) 



4 (1). Abdomen orange, mostly translucent, with a black 



stripe and sometimes black anus. 



5 (6). Head throughout, and especially above the antennae, 



without any silvery shimmer, dull. 



(1728. divisa, Mg.) 



6 (5). Head throughout, and always over the antennae, with 



a silvery or yellowish shimmer. 

 (8). Fore margin of the second and third abdominal 

 segments each with a narrow yellowish white 

 shimmer; fourth segment broadly so. 



(1730. ornata, Mg.) 



