270 DURHAM DIPTERA. 



XXXIII. 464. 



14 (13). Abdomen with all the segments grey. 



2049. Hydrophoria cornea, W. 

 Bishop Auckland, 5 $ and 3 ?, June, 1897. 



15 (12). Front half of the fore tibiae dark. 



(2050. brunneifrons, Ztt.) 



16 (11). Arista with short hairs. ( 2 °53« soda, Fin.) 



465. Hylemyia, Dsv. 



1 (26). Legs black. 



2 (9). Arista with long hairs. 



3 (4). Dorsum with two black stripes. (2054. virginea, Mg.) 



4 (3). Dorsum indistinctly striped. 



5 (6). Proboscis very thick. (2058. flavipennis, Fin.) 



6 (5). Proboscis of ordinary shape. 



7 (8). Thorax dark grey ; abdomen conico-cylindrical, with 



minute hairs ; size 5 mm. 



2055. Hylemyia variata, Fin. 

 Hesleden, 2 $ and 6 ?, August, 1899-1900; Shull, 

 1 $ and 3 ?, September, 1900. 



8 (7). Thorax dark brown ; abdomen depressed and oblong, 



hairy; smaller species, 4-5 mm. 



(2057. lasciva, Ztt.) 



9 (2). Arista short haired or pubescent. 



10 (11). Hind tibiae very bristly. 



2059. Hylemyia seticrura, Rnd. 

 Hesleden, 3 $ and 1 ?, August, 1 899-1 900. 



11 (10). Hind tibiae with few bristles. 



12 (21). Abdomen flat and depressed. 



13 (14). Small species, 3 mm. Abdomen with four central 



triangular spots. (2064. cinerosa, Ztt.) 



14 (13). Larger species, 6 mm. Abdomen with an interrupted 



central stripe. 



15 (20). Eyes of the male slightly separated. 



16 (17). Dorsum distinctly striped, the middle of the under 



side of the abdomen with a short tuft of hairs. 



(2060. cardui, Mg.) 



