24 Annals of the South African Museum. 



(R. M. Lightfoot), and type ? from Namaqualand, August, 1873 

 (R. Trimen). 



Length of body 12-13 mm., of proboscis 4-4' 5 nun. Body yellow- 

 haired, but here and there with purple-coloured macrochaetae. Frons 

 of male broad, that of female twice as broad, but only of usual width ; 

 the hairs are yellow, white below, with only a few black hairs 011 the 

 underside of the first antenual joint ; on the upper part of occiput 

 and on the sides of frous and face there are bristles of a bright red 

 colour, chiefly in the female ; the peristomial comb is well developed, 

 and of a purple red colour. Antennae black, the third joint narrowly 

 yellowish at base, elongate and very thin, with a short style ; the 

 first joint is not thickened, and is provided with long and numerous 

 yellow and red hairs, with a few black ones at the underside. 

 Proboscis black, rather short ; palpi black ; the hairs of the occipital 

 border are short, but above near the vertex they are very dense and 

 long. Thorax clothed with pale yellowish shining hairs, which on 

 the lower part of the pleurae are whitish. The three longitudinal 

 stripes of red hairs on the back are well developed in both sexes ; 

 there are long and strong bristles of a purple colour in front, in the 

 notopleural region and on the breast ; the metapleural tuft is formed 

 by yellow hairs and red bristles. Scutellum entirely black like the 

 thorax, clothed with yellow hairs and provided with strong bristles 

 of purple colour at the hind border. Halteres yellow with a red 

 stalk ; squamae dark, with a reddish fringe. Abdomen black, clothed 

 with long and shining yellow hairs, which are depressed to form a 

 tuft in the female; on the sides there are tufts of black hairs, which, 

 however, are almost wholly hidden between the yellow hairs ; the 



/ * 



bristles are long and strong, much longer than the hairs, chiefly those 

 on the last segments ; in the male they are more yellow, in the female 

 more purple and coloured like those of the thorax. Venter black, 

 with short reddish-yellow hairs. Legs entirely yellow, whitish-dusted, 

 with yellow spines, those of the hind femora very long and strong, 

 numerous, 8-10 on the lower row ; claws long, black, with reddish 

 base ; pulvilli very short in both sexes. Wings hyaline ; the fore 

 border to the basal cells and to the last fifth part of the marginal 

 cell is of a reddish-brown colour ; basal comb strong, with purple 

 bristles, yellow hairs above and a very conspicuous tuft of whitish 

 hair also above near the base. The veins are red at base and brown 

 at end ; marginal cell with broad end ; tipper branch of cubital fork 

 very retreating, the second submarginal cell being, therefore, three 

 times as broad at base as at end ; first posterior cell about of equal 

 width throughout with parallel sides; broad, obtuse at end and 



