100 Annals of the South African 



forwards, being near the antennae more than twice as broad as at 

 vertex. Face clothed with a dense grey dust and distinctly whitish 

 below, like the mouth borders ; it is bare in the middle, but at sides 

 below are long and dense black hairs which are directed forwards and 

 in contact with the whitish hairs of the genae, thus forming the 

 characteristic beard; lower part of the occiput likewise white-haired. 

 Antennae entirely black, but in the case of the types the ;]rd joint is 

 wanting; 1st joint long, distinctly thickened, and cloihod with vcrv 

 long and dense black hairs which are more dense, more rigid and 

 directed forwardly on the underside ; 2nd joint short and globular ; 

 in the female the first joint is less thickened and less hairy than in 

 the male. Proboscis black, l'5-l - 8 mm. long; palpi very Ihiii and 

 long, one-jointed, almost bare. Thorax and scutellum entirely deep 

 black, opaque ; in the middle of the back there is in front a grey 

 longitudinal stripe, much broader than that of har/xtf/i* ; the back is 

 clothed with long, erect, black hairs, but in front and on sides with 

 pale yellowish ones, and under the hairs there is a short, golden- 

 yellowish scattered dust ; pleurae with the pale hairs more numerous, 

 but devoid of golden dust; no distinct bristles. Squamulae whitish, 

 with black border and with long white hairs ; halteres yellowish, with 

 the knob black above in the male, but entirely whitish in the female. 

 Abdomen of elongate conical shape, coloured and clothed like the 

 back of mesonotum, but with more pale hairs at base and on sides; 

 the golden dust is, moreover, very abundant in the male ; venter grey, 

 pale-haired ; male genitalia with shiny black lamellae. Legs with 

 black coxae, femora and tarsi ; tibiae and base of praetarsi dark 

 reddish ; femora with yellowish scales and pale hairs ; spicules of 

 tibiae very small. ' Wings with the veins entirely black to the base ; 

 they are strongly infuscated. chiefly at base and at fore border, and 

 moreover along the veins. Cubital fork 2J times as long as broad at 

 end ; middle cross-vein placed near the middle of the upper border of 

 the discoidal cell ; apical cross-vein of the discoidal cell very sinuous 

 and very oblique ; apical stalk of the anal cell rather short. The 

 greyish prae-discoidal spot is very striking, passing into the blackish 2nd 

 basal cell. The base of the upper branch of the 3rd longitudinal vein is 

 nearly above the upper end of the apical cross-vein of the discoidal 

 cell, while in barl>af/is it is beyond, and in liylridus very much beyond. 



GrERON LEPTOCEKUS, Sp. 11OV. 



Nearly allied to the two preceding species, but distinct by the less 

 barbate genae and by the verv different antennae. 



