DURHAM DIFTERA. 149 



XXIV. 232. 

 232. Diaphorus, Mg. 



1 (2). Metallic black species with blackish wings and black 



halteres. ( I2 73- nigricans, Mg.) 



2 (1). Metallic green species with grey or brownish wings. 

 8 (6). Base of the abdomen translucent yellow. 



4 (5). Femora brownish black ; hind femora thickly haired 



at the tip beneath. The whole of the first two 



abdominal segments translucent. 



(1274. oculatus, Fin.) 



5 (4). Femora yellow, only the tip-third of the hind femora 



black. Only part of the second abdominal segment 

 yellow. ( I2 75- hoffmanseggit, Mg.) 



6 (3). Base of the abdomen not translucent ; halteres yellow. 



(1276. winthemi, Mg.) 



233. Argyra, Mcq. 



1 (8). When observed from the front only the abdomen 



silvered, the thorax with at most the shoulders 

 shining white. 



2 (3). Scutellum with short hairs on the disc besides the 



marginal bristles; legs mostly black or brown; 

 abdomen yellow at the sides. 

 1278. Argyra diaphana, F. 

 Bedburn, i ?, 1902. 



3 (2). Scutellum bare on the disc, only the marginal bristles 



present. 



4 (7). Hind metatarsus longer than the next joint; face 



black. 



5 (6). Abdomen scarcely silvered at all ; hind metatarsi not 



specially haired. ( I2 77- atriceps, Lw.) 



6 (5). Abdomen silvered ; hind metatarsi with some rather 



long hairs ; legs yellow. ( I2 79- confinis, Ztt.) 



7 (4). Hind metatarsus not longer than next joint; face 



white ; hind tibia? conspicuously bristly above. 



(1283. elongata, Ztt.) 



8 (1). When observed in front both thorax and abdomen 



broadly silvered ; scutellum bare on the disc. 



