﻿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). Scutellvim 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 

 visiially with three distinct longitudinal stripes [niicans group). 

 8 (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. 



inirpureus, sp. nov. 

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



brownisli-yellow as usually .... micans, Fahr. 



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

 7 (10). Sennes of the legs of a yellow colour; 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. 



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



species of greater size .... hypole^icus, Wied 



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



broad ; smaller size ..... Idrtus, Loew 



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



between the yellow ones ; thorax of female not distinctly sti'iped 

 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 Avith wholly black bristles, or rarely witli a few yellow 

 ones intermingled, abdominal ))ristles black or yellow (capensis 

 group). 



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



bristles iisually black and distinctly longer than the hairs. 



13 (20). Marginal cell entii-ely filled with brown, with or without hyaline spots 



at end. 



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



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. 

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



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



capensis, Loew. 

 17 (16). Brown spots of the hind border very broad ;ind united with tliose on 



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



middle size ...... megaspilus, sp. nov. 



