﻿Oil the Bomhyliid Fauna of South Africa {Diptera'). 153 



iridescent. The 2 whitish hyaline fenestrae are rouudecl and are 

 placed cue at the base of the 2nd longitudinal vein and one on the 

 middle cross-vein ; they are of about equal size ; at the base of the 

 3rd and of the 4tli posterior cell there are less-developed yellowish 

 stripes ; at the end of the anal cell there is in addition a rounded, 

 yellowish spot. Basal hook and basal comb black, the latter with 

 a dark greyish tomentum above ; veins quite I'eddish yellow and paler 

 on the hyaline parts of the wing ; 2nd longitudinal vein less looped 

 at end and not retreating, originating before the middle cross- 

 vein; marginal cross- vein obli(jue; upper branch of the cubital 

 fork S-shaped. First posterior cell dilated outwardly, as broad as the 

 2ud ; 3rd broadly truncate at base ; 4th broader than the 3rd at end ; 

 discoidal cell narrowed in the middle, with the middle cross-vein 

 placed before the centre, and with the terminal cross-vein straight, 

 but set ol)liquely ; anal cell broadly open. Alula yellowish-brown, 

 with a darkish fringe like the base of auxiliary lobe, which is black on 

 its apical half only, 



B. GKOirP NEMESIS, 



ExopROsopA (Exoprosopa) nemesis, Fabricius (1805). 

 Syst. Antl., 18U5, p. 121. 



A very distinct species, characterised by the entirely black Aviugs, 

 with a narrow whitish hyaline apex and some shining brownish spots 

 at cross-veins and bifucations. 



A specimen from M'Fongosi, Zululand, 1914 (W. E. Jones), and 

 another from Barbertou, Transvaal, December, I'Jll (H. Edwards). 



C. Gkoui' senioulus. 



Exoprosopa (Exoprosopa) morosa, Loew (1860). 



Dipteren-Fauna Siid-Afrikas, p. 332, pi. ii, tig. 30. 



A very characteristic species of great size, distinguished by the 

 abbreviated cross-band of the wings at the end of discoidal cell. 

 Originally described from Caiïraria, it is probable that Liftorhynchus 

 hamatiis, Macquart, from the Cape is the present species, chiefly 

 because the length of the proboscis seems to lie variable, as observed 

 by Miss Ricardo for the following species. There is a female sjîecimen 

 from Barberton, Transvaal, December, 1911 (H. Edwards). 



