38 Annals of the South African Museum. 



Type $ and type $ , a single pair of specimens from Namaqualand, 

 Springbok and O'Okiep (Cape), September and October, 1890 (K. M. 

 Lightf oot) . 



Length of body 15-16 mm., of wing expanse 36-38 mm. Head of 

 much broader shape than usual, black on the occiput, but yellowish 

 on the face and genae, clothed with greyish-dusty ; frons a little 

 hollowed at vertex, the ocelli being placed on a very prominent tubercle ; 

 its breadth at the narrowest point is in the male as broad as the ocellar 

 tubercle, the frontal triangle in the same sex being broad and provided 

 with a deep, longitudinal middle furrow ; in the female the frons is very 

 broad, with the middle furrow distinct basally only and with a deep 

 transverse furrow before the ocelli, homologous with the less developed 

 one which is to be observed at the same point in the male. Face broad 

 and much projecting, mouth-opening rather short and broad ; gena 

 broader than usual; proboscis rather long, straight, 11-12 mm. long, 

 entirely black ; the labiuin is conspicuously scabrose beneath, owing 

 to the fact that it is clothed almost on the whole length with very 

 numerous but short spinules, which in the female are distinct even at 

 the base of the labella. Palpi long and slender, black, with very short 

 black hairs. Antennae wholly black, rather distant at base ; first joint 

 with short but strong yellowish hairs ; second joint globular ; third 

 joint longer than the first two taken together, with an ovate base, but 

 with the linear terminal part longer than the basal and ending in a 

 minute style. All the hairs at the head are rather short and light 

 coloured ; those on the very swollen and broad occiput are white if 

 viewed from the side, and very dense ; the hairs on the ocellar tubercle 

 and on the vertex are brownish, yellowish, on the frons, scarce and 

 rigid towards the middle, denser and soft on the sides ; the face is 

 almost bare in the middle and has on the sides rather short, pale, 

 yellowish hairs. Around the mouth-borders there is a fringe of short, 

 but dense, yellowish hairs, leaving the lower part of the genae bare ; 

 peristome almost bare ; beard on chin, much less developed, white. 

 Eyes bare, with the upper areolets not at all enlarged in the male. 

 Thorax entirely black, broad and stout, rather flattened above ; clothed 

 with dense and short hairs of equal size, which are only a little longer 

 on the sides and on the pleura ; the hairs on the back are of a brownish- 

 yellow colour, but if viewed from the front show a white sheeu 

 chiefly in the male ; in certain lights there are to be seen four longitu- 

 dinal white stripes, two on the middle and two on the notopleural line, 

 one on each side, all placed at equal distance, not extending over the 

 middle, and more distinct in the female than in the male. On the pleurae, 

 between the reddish-brown hairs, there are two vertical bands of white 



