DURHAM DIPTERA. 269 



XXXIII. 463. 



6 (4) (5). Hind tibiae thickly clothed with hairs on both sides. 



7 (8). Hind tibiae with a long blunt spur at the end. 



2043. Trichopticus hirsutulus, Ztt. 

 Wearhead, 5 $ and 2 ?, August, 1901. 



8 (7). Hind tibiae without spurs. (2044. innocuus, Ztt.) 



9 (3). Halteres yellow. 



2045. Trichopticus pule her, Mde. 

 Wearhead, 2 $ and 1 ?, July- August, 1901. 



10 (2). Epistome with projecting beak. 



(2041. restrains, Mde.) 



11 (1). Abdomen yellow. (2040. semipellucidus, Ztt.) 



Sub-Family AnthomyiNjE. 



464. Hydrophoria, Dsv. 



1 (8). Legs black. 



2 (7). Dorsum with three stripes. 



3 (4). Subanal processes furnished with a tuft of long hairs 



at each side. (2048. caudata, Ztt.) 



4 (3). Subanal processes without the tufts of long hairs. 



5 (6). Scutellum grey with the point black, and the 



abdominal stripe of uniform width. 



(2046. ambigua, Fin.) 



6 (5). Scutellum quite grey ; abdominal stripe tapering. 



(2047. divisa, Mg.) 



7 (2). Dorsum with four stripes. (fusca, Mde.) 



8 (1). Legs partly yellow. 



9 (10). Femora and tibiae all pale. 



2051. Hydrophoria linogrisea, Mg. 

 Bishop Auckland, 4 $ and 1 ?, April-June, 1897- 

 1902. 



10 (9). Tibiae only pale. 



11 (16). Arista plumose with long hairs. 



12 (15). Tibiae entirely pale. 



13 (14). Abdomen with the basal segment partly pale and 



translucent. (2052. anthomyiea, Rnd.) 



