150 Annals of the South African Museum. 



3 (2). Hyaline part of the wings extended as much as, or even more than, the 



darkened part. 



4 (27). Wings typically dimidiate, viz. obliquely bordered with fuscous on 



the anterior half, the posterior one being hyaline with or without 

 dark spots or abbreviated bands. 



5 (14). Fore dark border of wings with abbreviated bands or projections 



departing from it and encroaching on the posterior hyaline part, but 

 always without isolated dark spots or infuscations of cross-veins 

 (seniculus-gronp) . 



6 (13). The middle fuscous band of wings is prolonged over the discoidal cell, 



reaching sometimes the hind border or nearly so. 



7 (12). The vein between the discoidal and the second posterior cell is long, 



placed horizontally, nearly V-shaped as in Dejilippia. 



8 (11). Discoidal cell very much dilated at end and with a projecting stump ; 



metapleural tuft mainly black ; second posterior cell narrower than 

 the third at end. 



9 (10). Wing-markings black ; middle band rather broad . morosa, Loew. 



10 (9). Wing-markings pale brown ; middle band very narrow. 



iynava, Loew. 



11 (8). Discoidal cell not, or less dilated at end and not appendiculate ; 



metapleural tuft yellow ; second posterior cell not narrowed at end. 



seniculus, Wied. 



12 (7). The above-named vein is short and almost straight; discoidal cell 



not or little dilated at end and not appendiculate ; metapleural tuft 

 yellow ....... elongata, Bic. 



13 (6). Middle band rudimentary, reduced to a short projection not reaching 



beyond the middle of the discoidal cell; this last cell narrow and 

 truncate at end .... argent if rons, Macq. 



14 (5). Fore dark border of the wings destitute of dark bands or projections 



proceeding from it ; if abbreviated bands are present there are also 

 isolated fuscous spots. 



15 (22). Wings with distinct isolated dark spots on hind border of apex, even 



if existing only as a faint infuscation at the upper end of the 

 discoidal cell or the inner end of the second posterior cell. 



16 (17). Wings with some isolated brown spots in the hyaline apex; terminal 



vein of discoidal cell short and perpendicular; antennal style rudi- 

 mentary (oojje?ms-group) .... capensis, Wied. 



17 (16). Wings without isolated dark spots on the hyaline apex, but with a 



spot on the hind hyaline part (wanting in dux) ; discoidal cell never 

 dilated at end (7ieros-group). 



18 (19). Legs entirely black ..... cluta, Loew. 



19 (18). Legs red, at least those of the front pair. 



20 (21). Wings with a broad, distinct, greyish patch at the lower angle of 



discoidal cell ...... heros, Wied. 



21 (20). Wings without such a patch . . . dux, Wied. 



22 (15). Wings simply dimidiate, without isolated spots at the apex or at the 



hind border (dimidiata-group). 



23 (24). The vein between the discoidal and the second posterior cell in a 



long and strongly V shape .... sigmoidea, Bezzi. 



