DURHAM DIPTEEA. 323 



XXXIX. 530. 



22 (21). Small species, 3 mm. 



2354. Psila villosula, Mg. 

 Hesleden, 1 $, August, 1900. 



532. Chyliza, Fin. 



1 (2). Third antennal joint with the upper edge concave; 



arista thickly set with short black hairs, making it 

 look thickened. (2356. atriseta, Mg.) 



2 (1). Upper edge of third antennal joint straight; arista 



thinly haired, not apparently thickened. 



3 (4). Femora with a black ring near the tip. 



(2357. anntdipes, Mcq.) 



4 (3). Femora not ringed. (2358. leptogaster, Pz.) 



533. Loxocera, Mg. 

 See Austen in E.M.M., March, 1899. 



1 (6). Face and cheeks black with at most the jowls 



brownish. 



2 (5). Large species, at least 7^- mm.; abdomen wholly 



black ; cheeks almost wholly black. 



3 (4). Hind margin of dorsum and the whole scutellum 



red. 



2359. Loxocera aristata, Pz. 



Hesleden, 2 $ and 2 ?, August, 1899-1902. 



4 (3). Dorsum and scutellum wholly black. 



(2359. aristata, Pz., var. yerburyi, Aust.) 



5 (2). Small species, not exceeding 5 mm. ; abdomen 



orange at the base beneath ; cheeks broadly 

 yellow in the middle. (2363. fulviventris, Mg.) 

 ' 6 (1). Face and cheeks yellow, sometimes with a black 

 facial stripe. 



7 (8). Frons and scutellum black. (2362. nigrif "r vns, Mcq.) 



8 (7). Scutellum, and at least part of the frons orange. 



9 (10). Large species, 6-8 mm. ; face without a central black 



stripe ; arista plumose. (2360. albiseta, Schrk.) 



10 (9). Small species, 4 mm. ; face with a black central 



stripe; arista almost bare. (2361. sylvatica, Mg.) 



