14 Annals of the South African 



9 (10). First posterior cell broad and less attenuate outwardly ; discoidal 

 cell large ; proboscis long ; third antennal joint reddish ; large size. 



eurhinatus, sp. nov. 



10 (9). First posterior cell narrow and acute outwardly : discoidal cell very 



small ; proboscis very short ; third antennal joint black ; smaller 

 size ...... brachyrrlnjnrh us, sp. nov. 



11 (8). Scutellum greyisli black, like the thorax; frons of female much 



narrower ; hairs of body longer ; wings entirely hyaline ; proboscis 

 short; species of smaller size . . . ylobiihis, sp. nov. 



12 (7). Proboscis entirely black, or only red on the under side ; third antennal 



joint usually black; discal cross- vein placed on or a little after the 

 middle of the discoidal cell. 



13 (14). Antennae entirely black, but with whitish hairs on the base; palpi 



black ; proboscis entirely black ; femora broadly black at base, but 

 with yellow spines ; abdomen with rows of black hairs at the hind 

 borders of the segments ; great size . . impwus, Loew. 



14 (13). Antennae with red base or entirely red ; palpi red; proboscis often 



red below ; femora entirely yellow ; abdomen without rows of black 

 hairs ; usually smaller. 



15 (18). First posterior cell long and exceedingly attenuate outwardly, 



very acute, with a short stalk ; second antennal joint red like the 

 first. 



16 (17). Abdomen broadly red on the sides and on the hind borders of the 



segments ; hairs of body yellow ; frons of female of usual width ; 

 third antennal joint short ; first posterior cell with a short but 

 distinct stalk ; proboscis red below . . ,iiinnliis,'Loevf. 



17 (16). Abdomen entirely greyish black, or only with a narrowly red hind 



border to the segments ; hairs of body grey ; frons of female distinctly 

 broader; third antennal joint longer ; first posterior cell very briefly 

 stalked, almost sessile ; proboscis entirely black. 



sessilis, sp. nov. 



18 (15). First posterior cell of usual shape, blunt outwardly, with a long 



stalk ; second antennal joint usually black like the third. 



19 (20). Antennae entirely red ; proboscis entirely black ; scutellum without 



black border ; abdomen entirely black with dense and equal yellowish 

 hairs ...... xanthocerus, sp. nov. 



20 (19). Antennae with the third joint black, and usually with the second 



also black. 



21 (22). Scutellum with a broad black hind border; abdomen and proboscis 



entirely black ..... marginellus, sp. nov. 



22 (21). Scutellum without black border. 



23 (24). Very small species ; proboscis black, or only dark red below ; abdomen 



with yellow sides, end and hind border of segments red ; hairs of 

 body usually whitish .... paterculus, Walk. 



24 (23). Species of large size; proboscis red below, abdomen entirely black. 



25 (26). Head and end of abdomen with yellowish hairs ; face dark ; small 



size ....... fncatus, sp. nov. 



26 (25). Head and end of abdomen with white hairs; face yellow; large 



size ....... rvfce]>s, Macq. 



