22 Annals of the South African Museum. 



The numerous species in the collection, with the addition of others 

 before me, may be distinguished with the aid of the following table : 



1 (24). Scutellum black ; bristles on the genae always present ; wings with 



an extended pattern consisting of a brown fore-border or of some 

 broad dark spots. 



2 (11). Wings with a dark fore border, provided with more or less distinct 



darker spots, but without any distinct broad brown spot on the hind 

 half ; bristles of the genae entirely yellow, or rarely with a few black 

 ones intermingled ; bristles of abdomen entirely yellow ; thorax 

 usually with three distinct longitudinal stripes (micans group). 



3 (6). Wings with a red or yellow basal comb; femora entirely yellow. 



4 (5). All the bristles of the body are of a bright purple-red colour, even 



those of the basal comb ; wings with a reddish fore border. 



purpiireus, sp. nov. 



o (4). All the bristles yellow, even those of the comb; fore border of wings 

 brownish-yellow as \isually .... micans, Fahr. 



6 (3). Wings with a black comb ; femora black towards the base. 



7 (10). Spines of the legs of a yellow coloiir; bristles of the genae entirely 



yellow ; thoracical stripes of the female distinct ; inf uscation of the 



cross-veins into the dark fore border of wings not spot-like. 

 .S (9). Second and third posterior cells short, distinctly broader than long ; 



species of greater size . . hypoleucus, Wied. 



!( (8). The above-named cells are long, longer than broad or as long as 



broad; smaller size ..... hirtus, Loew. 



10 (7). Spines of the legs entirely black ; genae with a few black bristles 



between the yellow ones ; thorax of female not distinctly striped ; 

 infuscations into the dark fore border broader and spot-like. 



servillei, Macq. 



11 (2). Wings with broad, isolated dark spots on the hind half, the dark fore 



border being more or less developed or wanting, basal comb always 

 black, genae with wholly black bristles, or rarely with a few yellow 

 ones intermingled, abdominal bristles black cr yellow (capensis 

 group). 



12 (21). Legs with black spines ; peristomial comb usually black ; abdominal 



bristles visually black and distinctly longer than the hairs. 



13 (20). Marginal cell entirely filled with brown, with or without hyaline spots 



at end. 



14 (19). Marginal cell with two broad hyaline spots at end ; abdomen with the 



usual strong black bristles. 



15 (18). Along the hind border of the wings there are brown spots on the last 



segments of the longitudinal veins; anal cell with a brown spot at 

 apex. 



16 (17). Brown spots at end of the veins on the hind border very small and 



isolated ; anal cell with a small dot at apex, species of greater size. 



capensis, Loew. 



17 (16). Brown spots of the hind border very broad and united with those on 



the discoidal cell ; anal cell at end with a very broad spot ; species of 

 middle size .... . mefjaspilus, sp. nov. 



