Bombyliidae (Diptera) from Central Africa. 635 
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. rostratus, 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 9, from West: Nyasa, Ekwendeni (Dr. H. 8. 
Stannus); a single specimen. 
15. Exoprosopa, Macquart (1840). 
Even as restricted here, with the exclusion of the genera 
Litorrhynchus and Hyperalonia, this genus remains a very 
rich one; and it must be recognised that the species 
included in it are rather heterogeneous. 
It is very probable that many species, if not all, have, 
during their larval life, habits similar to those of 
Thyridanthrax. 
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, 
