222 DURHAM DIPTERA. 



XXXI. 338. 



338^. Parexorista, Br. & Berg. 



45 (46). V.4. beyond the angle straight. 



Parexorista fiigax, Rnd. ? 

 Bishop Auckland, 2 $ (bred), October, 1899. 



46 (45). V.4. beyond the angle curved. 



Parexorista grossa, Br. & Berg. 

 Waskerley, 1 $, July, 1901. 



342. Frontina, Mg. 



1 (2). Abdomen black with white shimmering fore marginal 



bands. (1692. nigricans, Egg.) 



2 (1). Abdomen translucent yellow with black central 



stripe. ( x 693- lata, Egg.) 



344. Phorocera, Dsv., and others. 



1 (16). Palpi at least yellow at the tip. 



2 (3). V.4. bent in a curve. (1696. serriventris, Rnd.) 



3 (2). V.4. bent at an angle. 



4 (7). Scutellum all black, or at most with the tip a little 



orange. 



5 (6). Tibiae black. 345. Bothria (1701. ccesifro?is, Mcq.) 



6 (5). Tibiae pale. 



343. Campyloch^eta, Rnd. (1695. obscura, Fin.) 



7 (4). Scutellum wholly or chiefly orange. 



8 (9). Palpi unusually narrow and comparatively short. 



350. Stomatomyia, Br. & Berg. (17 24. filipalpis, Rnd.) 



9 (8). Palpi normal. 



10 (11). X.5 2 in the middle between X.4. and the bend of V.4. 



343. CampylochjETa (1695. obscura, Fin.) 



11 (10). X.5 2 nearer to the bend of V.4. than to X.4. 



12 (13). Discal abdominal bristles absent from the middle 



segments. 



345. Bothria, Rnd. (1702. segregata, Rnd.) 



13 (12). Discal abdominal bristles present on the middle 



segments. 



