90 Annals of the South African Museum. 



A male specimen from Kimberley (Cape) March 14th, 1912 (J. H. 

 Power), and a female from Potchefstroom (Transvaal) (T. Ay res). 



Length of body 7-8 mm. ; of wing 6-7 mm. Occipital border with 

 veiy long yellow hairs which form a complete crown ; ocellar tuft 

 yellow in both sexes, but in the male a little dai'ker. Face very short, 

 with entirely yellow hairs, continued over the very narrow cheeks ; 

 beard short, yellow ; eyes of male intimately connected ; f rons of the 

 female less broad than the eye, clothed with dense golden yellow 

 tomeutum and with erect yellow hairs ; the hairs of the cheeks in the 

 female are white. Antennae entirely black, the first joint with yellow 

 hairs, those of the upper side very short, those of the under side very 

 long; third joint longer than the first two joints taken together, 

 linear, obtuse at end, not narrower than the second at base, with a 

 very minute style. Proboscis black, 2 mm. long ; palpi black, pale- 

 haired. Thorax and scutellum wholly deep black, clothed Avith equal, 

 dense and rather long yellow hairs, those on the back being pale 

 shining if viewed from the front ; the hairs on the pleurae are less 

 pale ; metapleura bare, but concealed below the mesopleural and 

 squama! tufts ; there are no distinct bristles. Squamae dirty-whitish, 

 with long yellow fringe ; halteres yellow, witli a white knob. Abdomen 

 of conical shape, entirely black, clothed with hairs like those of the 

 thorax, which on the venter are shorter and rarer ; male without, 

 female with distinct and long, black, bristly hairs at the hind borders 

 of the segments ; male genitalia black, yellow-haired ; female geuitalia 

 with broad black lamellae, the upper one rather shining and golden- 

 fringed at apex. Legs black, with yellowish scales, whitish hairs and 

 black spines on femora; middle femora with 1, hind femora with 2-3 

 spines on the apical half. Wings entirely hyaline, narrowly yellowish 

 near the base ; veins yellow, darkened at end ; upper branch of the 

 third vein a little 1'etreating at base. 



G-ONARTHRUS CTONUS, Bigot (1892). 



Allied to the preceding, but distinguished by the very lung, white 

 pubescence of the entire body and by the black knob of the halteres 

 in the male sex. 



The present species was briefly, but recognisably, described from 

 the Cape. There are in the Museum Collection numerous specimens of 

 both sexes from Stelleubosch (Cape) (L. Pc'ringuey), Potchefstroom 

 (Transvaal) (T. Ayres), Namaqualand, O'Okiep (Cape), October, 

 1890 (E. M. Lightfoot). One of these examples was labelled by 

 Bigot as Bombylius niveus, Macquart an impossible thing, however, 



