﻿Bomhyliidae (Biptera) from Central Africa. 625 



Type ,^ from North Nyasa, Mpanda Mountain, November 

 20, 190ii {Dr. J. B. Dave//). Type $ and another specimen 

 from West Nyasa, Liinpachi Iviver, October 1909 (Dr. H.S. 

 Stannus). 



32. Villa fla.vesccns, Loew (I8(j0). 



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. Darcy); the ? fi'om West Nyasa (i)r. 11. S. 

 Stannus). 



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. Thyridanthrax, Osten-Sacken (1886). 



This name was originally proposed for the species related 

 to fencstratus and elcgans, which show the characteristic 

 wing-pattern with the dark marking interrupted by pel- 

 lucid spots on the cross-veins and bifurcations. But I find 

 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. 



• • • 1 



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, scntelluin and abdomen in great part 

 red ... ... macquarti, SI), n. 



