On /lie lioinliylUJ. Fauna <>f South Africa (Dipiera). 3 



African. Poor in representatives is the genus Hyperalonia, which 

 for a long time was believed to be absent from the Cape Fauna. 



The classification of the family will be dealt with by me in my forth- 

 coming general work on the Bombyliidae of the Ethiopian region in 

 the British Museum ; the classification has recently made great 

 progress through the valuable contribution of my friend Th. Becker, 

 'Genera Bomb yliidarum,' 1913, in which he recognised no less than 

 fifteen subfamilies. 



I give here a synoptic table of the groups and of the genera 

 represented in the collection of the South African Museum. 



1 (54). Hind border of the eyes not indented, or very rarely with a deep 



sinuosity only (Eurycarcnus) ; eyes without a bisecting- line. 



2 (47). Occiput flat, not bilobate above and without a central cavity ; 



occipital fringe typically placed at the border of the eyes. 



3 (46). Prothorax less developed and not especially setose. 



4 (45). Metasternum not specially developed ; hind legs not specially strong ; 



eyes of the females separated ; body rather broad and more or less 

 pilose. 



5 (22). Tibiae with 3 rows of long spicules ; proboscis long; palpi single- 



jointed ; metapleurae usually hairy ; body bristly. 



i) (21). Abdomen broad, of oval or rotund shape; antennae approximate 

 together at base (Boinbyliinae). 



1 (16). First posterior cell closed at end ; metapleurae usually hairy. 



8 (15). Hind border of the eyes absolutely entire; first posterior cell closed 

 by the third longitudinal vein ending at costa ; wings with a well- 

 developed basal comb. 



it (12). First basal cell longer than the second. 



10 (11). Three submarginal cells present . . . Triplasius, Loew. 



11 (10). Two submarginal cells present . . . Bombylius, Loew. 



12 (9). First basal cell not longer than the second. 



13 (14). Face prominent and moderately pilose; discoidal cell as in the 



preceding genus ..... Systoechus, Loew. 



14 (13). Face rounded and more densely pilose ; discoidal cell very obtuse at 



end ....... Anastoechus, O.S. 



15 (8). Hind border of the eyes with a deep sinuosity; first posterior cell 



closed by the fourth longitudinal vein ending at costa; basal comb 

 small or wanting ..... Eurycarenus, Loew. 



16 (7). First posterior cell open; wings with no distinct basal comb; 



metapleurae iisually bare. 



17 (18). Only two submarginal cells present . . Dischistus, Loew. 



18 (17). Three submarginal cells present. 



19 (20). Third antennal joint quite bare above . . Adelidea, Macq. 



20 (19). Third antennal joint beset with long hairs above 



Sosiomyia, gen. nov. 



21 (6). Abdomen narrow and cylindrical; antennae separated at base 



(Cythercinae) .... Oniromyia, gen. nov 



