156 DURHAM DIFTERA. 



XXIV. 244. 



3 (4) (5). Face burnished blue-green on the upper half. 



(1330. Mpunctatus, Lehm.) 



4 (3) (5). Face (<?) silvery whitish. (1331. borealis, Lw.) 



5 (3) (4). Face orange. (1331^-. rufibarbis, Gerst.) 



6 (1) (2). Wings not spotted, at most a X-vein a little clouded. 



7 (12). Grey-green species. 



8 (9). Scutellum with only two bristles. 



1336. Hydrofihorus biselus, Lw. 

 Hesleden, 1 $ and 4 ?, June-August, 1900 ; Wear- 

 head, 1 $, August, 1 90 1. 



9 (8). Scutellum with four bristles as usual. 



10 (11). Face whitish. ( J 334« pracox, Mg.) 



11 (10). Face all orange. (*?>?>$' viridis, Mg.) 



12 (7). Olive brown species. 



13 (14). Face entirely dull. ( I 333- Utoreus, Fin.) 



14 (13). Face silver white below, and shining green above in 



the male, all shining green in the female. 



(1332. baltzcus, Mg.) 



245. Liancalus, Lw. 



1 (2). Legs all black, scutellum with six bristles, wing of 



the male snow-white at the tip. 

 1337. Liancalus virens, Scop. 

 Wearhead, 1 ?, August, 1901. 



2 (1). Legs black with yellow knees and joints, scutellum 



with four bristles. ( J 338- lacustris, Scop.) 



" The genus Alleoneurus is not worth adoption." — Verrall. 



247. Campsicnemus, Wlk. 



1 (8). Fore or mid legs in some way thickened or twisted; 



antennae not pale at the base. 



2 (5). Fore tarsi dilated or peculiar; mid tibiae not thickened. 



3 (4). Fore tarsi of male with long flap-like appendages as if 



slit ; fore tibiae and fore femora dilated ; other legs 

 simple; face yellow or pale. (1339. magius, Lw.) 



