Bombyluidae (Diptera) from Central Africa. 689 
Thorax black, with a yellow spot before the scutellum and yellow 
shoulders ; it is clothed with dense grey hairs, without any black 
hairs, as are also the pleurae ; the tomentum is yellow; the usual 
bristles are wanting, so far as I can see; metapleural tuft white; 
squamulae dark brown, with a whitish fringe; halteres yellow. 
Scutellum yellow, with white hairs, without bristles. Abdomen of 
oval shape, entirely yellow, with a black rounded basal spot in the 
middle of the second segment and very narrow transverse black 
stripes before the hind margin of the second and third segments ; 
there is white tomentum on the sides and on the venter ; first seg- 
ment with whitish hairs on the sides. Male genitalia yellow. Legs 
wholly yellow, the tarsi darkened at the tip; hind tibiae with short 
black bristles ; ungues with the base red and bearing a small tooth ; 
femora without bristles. Wings short and broad, greyish hyaline, 
with a yellowish tint, which is more intense towards the base and 
along the fore margin ; veins thick, yellow, brown outwardly ; small 
cross-vein placed a little before the middle of the discal cell ; base 
of the second vein opposite to the small cross-vein ; the vein dividing 
the second from the third submarginal cell bent at a right angle in 
the middle and here with a short stump; the first posterior cell very 
broadly open, second and third almost of equal width at the end; 
discal cell short and of a very characteristic shape, its posterior 
boundary deeply bisinuate, forming with the proximal boundary a 
wide W with rounded angles ; in the right wing only of the typical 
specimen the middle angle of the W emits an appendix into the cell. 
Anal cell broadly open. Prealar hook yellow; basal comb of the 
wings yellow. 
Type f, from North Nyasa, Lake shore, near Deep Bay, 
December 25, 1909 (Dr. J. B. Davey); a single specimen. 
52. Hxoprosopa venosa, Wiedemann (1819). 
A single specimen from Nyasaland, Blantyre, April 20, 
1910 (Dr. J. E. S. Old), which agrees well enough with 
Loew’s description, but has a rather longer proboscis and 
the white scales of the abdomen disposed in a somewhat 
different manner. The long erect black hairs covering the 
upperside of the abdomen are very peculiar. 
53. Hxoprosopa lepidogastra, sp. nov. 
@. Length of the body (of 5specimens) 12-13 mm., of the wing 
11-12 mm. 
A very distinct species owing to its quite narrow and elongated 
discal cell and the conspicuous patches of black scales on the sides of 
the abdomen. 
