﻿118 Annals of the Soiith African Museum. 



eud of the tibia. Claws long ; pulvilli well developed. Wiugs short 

 and narrow, without basal comb, and with the membrane strongly 

 folded (whence the name Pteraulax). Base narrow, the alula less 

 developed, but distinct and rounded ; praefurca short. Second and 

 third vein at an acute angle ; second vein looped at end, but not 

 reti'eating ; cubital fork broad, retreating at the base of the upper 

 branch and united with an appendage to the second vein. Therefore 

 there are 3 submargiual cells, the base of the upper branch of the 

 cubital fork in the shape of a short cross -vein between the appendix 

 and the rest, which are on the same line. First posterior cell closed 

 before the border, acute at end, and provided with a rather long stalk ; 

 discoidal cell obtuse at end, less than twice as long as the second 

 posterior cell, the discal cross- vein placed a little before its middle ; 

 2nd, ord and 4tli posterior cells of equal breadth at end ; anal cell 

 long, with parallel sides, narrowed at end but open. Ambient vein 

 complete ; axillary lobe well developed. 



In the allied Cononeclys stenura, Loew, there are no pulvilli ; but in 

 C. erythrasjyts they are present, and Prof. Hermann has proposed for it 

 a new genus, Conugaster — a name which cannot be maintained, because 

 it is preoccupied in the Diptera by Brauer and Bergeustamm, 1892. 



Type : The following new species. 



Pteraulax plexicornis, sp. nov., (^ , ? . 



An AjjJioebantus-like species of middle size, very distinct owing to 

 its singular venation and by the shining black hind part of the 

 scutellum. 



Type 1^ and type 9 ; ^ single couple of specimens from Bush- 

 manlaud, Een Riet (Cape), October, 1911 (E. M. Lightfoot). I 

 have seen in the Museum of Budapest a second species from Willow- 

 more, in which the scutellum is not shining black behind and the 

 abdomen is more setose. 



Length of the body 10 mm. ; of a wing 7 mm. Entirely black, 

 grey-dusted, and white and yellowish tomentum. Occiput dark grey- 

 dusted above and paler grey below, with short greyish pubescence 

 and white scales on the sides near the eye's indentation. Ocellar 

 tubercle black, grey or brownish-haired. Frons of the male grey- 

 dusted and entirely clothed with whitish hairs, like the face; frons of 

 female shining black, with brownish hairs, with whitish ones like 

 those of the face in front only. Antennae black ; first joint with 

 whitish hairs. Proboscis black ; palpi yellow. Thorax black ; on the 

 back it is dark grev-dusted, with three dist inct but narrow longitudinal 



