Bombyliidae (Diptera) from Central Africa. 625 
Type f from North Nyasa, Mpanda Mountain, November 
20, 1909 (Dr. J. B. Davey). Type 2 and another specimen 
from West Nyasa, Limpachi River, October 1909 (Dr. HS. 
Stannus). 
32. Villa flavescens, Loew (1860). 
A single couple, agreeing well with the description. 
Face without black hairs. The male (hitherto unknown) 
shows a silvery scale at the base of the wing. 
The ¢ from North Nyasa, from Deep Bay to Vua, May 14, 
1909 (Dr. J. B. Davey); the 2 from West Nyasa (Dr. HS. 
Stanwus). 
33. Villa albescens, Loew (1860). 
Closely allied to the preceding, but quite distinct ; face 
also without black hairs. 
A couple from Southern Nigeria, Oshogbo, February 1-27. 
1910 (/. J. Simpson). 
These two species are not unlike our European species 
of the group ixion-humilis, but have the tibiae yellowish 
and covered with yellow scales; V. lasia and sexfasciata, 
Wied., belongs also to the same group. 
12. Thyridanthraz, Osten-Sacken (1886). 
This name was originally proposed for the species related 
to fenestratus and elegans, which show the characteristic 
wing-pattern with the dark marking interrupted by pel- 
lucid spots on the cross-veins and bifurcations. But I tind 
that it is impossible to separate from this group the species 
of the group afer, notwithstanding the different pattern of 
the wings; the third joint of the antennae also shows 
gradations from the short to the elongate form. 
Some species of this group have hyaline wings without, 
or almost without, any pattern; these species cannot be 
confused with those of Villa, on account of the form of 
the face, which is projecting, not rounded. 
The species of this genus are of economic importance, as 
they prey upon the egg-cases of locusts. 
The species before me can be distinguished as follows :— 
1 (2). Third joint of the antennae in the shape of an elongate 
cone, gradually tapering to a style which is shorter than 
the cone; dark marking of the wings with pellucid 
spots; head, scntellum and abdomen in great part 
TeGuatd: waine tue: Lee Macquarti, sp. D. 
