ADAMS : DIPTERA AFRICANA. .175 



shining, largely black, first, second, anterior angles of third, 

 and anal segment yellowish ; third, fourth and fifth segments 

 each with a pair of submarginal bristles. Legs yellow, base of 

 hind tibiae, and tip of their tarsi fuscous, front femora with the 

 usual tubercle below, which bears four short spines, just proxi- 

 mad to it is a single, stronger bristle, the tibiae with a small 

 swelling near base, which is covered with small spines, middle 

 tibiae with a pair of bristles near the middle and a third bristle 

 near base of outer third, hind femora with two bristles on outer 

 side of apical third, hind tibiae also with a pair on outer third. 

 Wings hyaline, without apical spot, first large vein at base of 

 wing swollen, bordered with brown. 



Female : Agrees with the male, except the mesonotum, re- 

 gardless of the humeri, and the abdomen, except the anterior 

 angles of second segment, are wholly black ; also the legs lack 

 the bristles. Length, 3.8 mm. 



Three specimens ; April and May. 



Sepsis propinquus, n. sp. 



Male : Head shining black ; front with a pair of ocellar and 

 two pairs of vertical bristles ; antennae obscure reddish yellow, 

 third joint with upper margin brownish black ; face reddish 

 yellow, oral margin brownish, median carina low ; cheeks with 

 a yellowish cast ; proboscis brown, with apex yellowish ; occi- 

 put subopaque above. Thorax black; mesonotum and scutellum 

 subopaque, one humeral, two posthumeral, one supraalar, one 

 postalar, and a pair of scutellar bristles present ; pleurae shining 

 above and grayish below, with one mesopleural bristle ; halteres 

 yellow. Abdomen shining black, third, fourth and fifth segments 

 with the usual pair of bristles. Legs black, front coxae and tro- 

 chanters, middle coxae on apical half, and their trochanters 

 yellowish ; front femora with the usual tubercle below which 

 bears three short spines, with one strong one proximad and two 

 less strong ones distad to it, the swelling on base of anterior 

 tibiae small, all tibiae with two bristles near the middle. Wings 

 hyaline, the large vein at base of wing swollen, bordered with 

 brown, the apical spot at tip of second vein present. Length, 

 2 mm. 



One specimen ; May. 



