﻿Bomhyliidcic {Diptera) from Central Africa. id?>o 



Head reddish-brown, darkened above and behind. Antennae wholly 

 yellow, with a very long style; thorax with the collar yellow-haired; 

 lateral tufts with yellow and black hairs intermingled ; the white 

 tufts below the posterior calli are large ; the bristles are black. 

 Scutellum reddish. Abdomen reddish on the sides of the second, third 

 and fourth segments ; the hairs and spots as usual. Legs wholly 

 yellowish-red, wings as in L. rostrcdiis, but the pellucid spot on the 

 small cross-vein less developed ; basal band distant from the end of 

 the anal cell. The outward margins of the two cross-bands are more 

 straight than in the related species ; the middle band not filling the 

 apex of the second posterior cell, which remains hyaline in its whole 

 length along the hind margin of the wing. 



Type Ç, from West Nyasa, Ekwendeni (Dr. H. S. 

 Stan7ius) ; a single specimen. 



15. Exoprosopa, Macquart (1840). 



Even as restricted here, with the exclusion of the genera 

 Litorrliynchns and HyiMralonia, this genus remains a very 

 rich one ; and it must be recognised that the species 

 included in it are rather Ijeterogeneous. 



It is very probable that many species, if not all, have, 

 during their larval life, habits similar to those of 

 Thyridanthra.i'. 



The numerous forms in the collection can be divided as 

 follows : — 



1 (4). Discal cell with a strong right angle projecting into the 



third posterior cell. 



2 (3). Body and legs black; wings almost all blackish 



umbrosa, Loew, p. 638. 



3 (2). Head, abdomen and legs yellow ; wings yellowish hyaline 



inermis, sp. n., p. 638. 

 4(1). Discal cell without such an angle projecting into the third 

 posterior cell, the vein dividing it from this cell being 

 straight or only S-shaped. 



5 (10). The transverse vein between the discal cell and the second 



basal cell very strongly S-shaped. 



6 (7). Wing darkened almost over its entire surface, with broad 



fuscous borders along the veins ; discal cell very pointed 

 externally, as in Litorrhynchus ; second longitudinal vein 

 very strongly bent at its end ; abdomen clothed with long 

 erect black hairs . . . venosa, Wied., p. 639. 



