138 Annals of the South African Museum. 



"was referred erroneously by Macquart to Anthrax collaris, Wied., which 

 is an Indian species, and was described by Loew under the name of 

 Exoprosopa rostrata. It seems to be exclusively a South African 

 species, and not at all rare. It ranges from Cape Town to Rhodesia. 

 There is a female specimen from the Transvaal, Barberton, April, 

 1911 (H. Edwards), in which the anal cell is more broadly hyaline 

 than usual. 



LlTORRHYNCHUS TOLLINI, Loew (1863). 



A species smaller and paler coloured than the preceding one, and 

 usually with a hyaline spot in the middle of the first posterior 

 cell. Dr. Pcringuey has bred this species from the mud nest of the 

 ubiquitous wasp Scelifrons quartinae, together with the large Ich- 

 neumon, Ospryiichotus capensis, and aMutillid, DolicJinmiiiilla sycorax. 



LlTORRHYNCHUS ARGYROLEPIS, BeZZl (1912). 



Easily distinguished on account of its characteristic wing pattern, 

 Avith the middle dark baud narrowed at end. 



Originally described from Nyassaland, there is in the collection a 

 specimen from Potchefstroom, Transvaal (T. Ayres), also from 

 Salisbury (S. Rhodesia) (D.Dods.) ; Bulawayo (S. Rhodesia) (R. W. E. 

 Tucker). 



EXOPROSOPA, Macquart (1840). 



This very large genus has been, divided by me into a number of 

 subgenera. Those represented in the South African Fauna may lie 

 distinuished as follows : 





1 (4). Discoidal cell before the end below with a strong- projecting- angle and 

 there provided with an appendage ; its terminal vein more or less 

 sinuous, and placed at an angle to the longitudinal axis of the 

 wing. 



"2 (3). Five posterior cells, the fourth being closed and stalked. 



Metapenta, Bezzi, n. 



3 (2). Only four posterior cells, all open as iisual . Acrodisca, Bezzi, n. 



4 (1). Discoidal cell without such a projecting angle ; if sometimes dilated, 



the projection is a rounded one and destitute of appendage. 



5 (6). The vein between the discoidal and the second posterior cell is long, 



strongly sinuous, and runs in the same direction as the longitudinal 

 axis of the wing ..... Defilippia, Lioy. 



6 (5). The above-named vein is short, straight or only slightly sinuous, and 



placed at an angle or even perpendicularly to the longitudinal axis 

 of the wing ..... Exoprosopa, s. str. 



