﻿On the Bomhyîiid Fauna of South Africa {Diptera). 91 



because in Macquart's species the discal cross-vein is situated, near the 

 base of the discoidal cell. 



The length varies between 7 and 11 mm., but usually it is 8-9 mm. 

 The third antennal joint is very broad in the male, and less distinctly 

 so in the female ; the hairs of the first antennal joint are very dense 

 and long underneath ; the ocellar tuft is black in the male and dark 

 yellow in the female ; the frons of the female is very narrow, even 

 narrower than the eye, and on each side of the vertex there is some- 

 times a tuft of long yellowish hairs, but no black hairs at all. The 

 proboscis is black, very short and exceedingly thick, with broad 

 terminal labella. Thorax, scutellum, and abdomen entirely deep 

 black, clothed with very long and shining whitish hairs, without 

 bristles, even on the hind borders of the abdominal segments of the 

 female ; in this sex there is a short and dense tomentum of more 

 yellowish colour under the long pubescence. The knob of the haltères 

 is entirely yellow in the female, and is white with a black band above 

 in the male. Venter with short and scarce hairs, but concealed under 

 the very long and dense hairs of the lower sides of the tergites. Legs 

 with dense white scales, long white hairs and black bristles ; middle 

 femora Avith 1-2, hind femora in the male with 2-3, and with 5-7 

 spines in the female ; they are l.ilack, but the tibiae and the tarsi at 

 base are often of a yellowish ground-colour below the scales. Wings 

 very shoi't, entirely vitreous and iridescent, with a tuft of silvery 

 hairs near the base on the outer side ; veins black, yellowish toward 

 the base ; upper branch of the cubital fork a little retreating at 

 the base. 



GrONABTHRUS CHIONEUS, Sp. nOV., (^ . 



Closely allied to the preceding species, but distinct owing to the 

 long and thin pi'oboscis and to the basal joint of the antennae being 

 black-haired above. 



Two males in the writer's collection, from Willowmore (Cape), 

 February, 1907 (Dr. Brauns). 



Length of body 7'5-9"6 mm. ; of a wing 5"5-7"5 mm. Occipital 

 crown formed by very long, white hairs, wliich appear to be fairly 

 yellowish near the base; ocellar tuft black, rather short; frontal 

 triangle very small and deep. Antennae black, with the first joint 

 rather black, and provided with short black hairs above and with long 

 ones partly yellowish, partly white below ; third joint longer than the 

 two first together, linear, obtuse, as broad at the base as the second 

 joint, with a minute terminal style. Face very short, almost bare, 

 concealed below^ the long antennal hairs ; the mystax is confined to the 



