74 Annals of the South African Museum. 



9 (12). Abdomen as broad as or only a little narrower than the thorax, not, 

 or less distinctly, conical ; halteres with a white knob. 



10 (11). Tibia and tarsi red ; chin with a dense tuft of black hairs; femora 



dark-pilose ; species of greater size . . hirtipes, Macq. 



11 (10). Tibiae and tarsi black ; chin destitute of black hairs; femora white- 



pilose below ; eye-division in the male less distinct than usually. 



cluvicornis, Wied. 



12 (9). Abdomen conical, only half as broad as the thorax ; halteres with 



dark knob ; tibiae and tarsi dark reddish-brown ; sometimes there are 

 three submarginal cells in the wing . anceps, Bezzi. 



13 (6). Facial brush formed entirely by black hairs, with a yellow tuft on the 



base of the antennae ; tibiae and tarsi black ; third antennal joint 



thin at base and broadly clavate at end . bicolor, sp. nov. 



li (1). Third antenual joint rufous; anal cell narrowly open at the wing 



border, tibiae and tarsi yellow . . . rvficornis, sp. nov. 



CORSOMYZA SIMPLEX, Wiedeuiauu (1820). 



A species of proportionately large size, distinct from any other by 

 the elongation of the first antennal joint. Described and figured from 

 the Cape by Wiedeinanu, and not recorded subsequently ; but I am 

 convinced that Macquarfs C. fuscipennis from the Cape is the female 

 of this same species, chiefly on account of the form of the antennae ; 

 the infuscation of the wings is in the male more yellow than fuscous. 

 There is in the collection a male specimen from Cape Town, 1888 

 (W. F. Purcell), and another example from. Namaqualand, 1889 

 (E. M. Lightfoot). 



The pubescence of the body is of a pale fulvous colour, but shows 

 white gleams when seen from the front. Occiput shining black, with 

 a faint grey dust and with scarce and short pale yellowish hairs ; the 

 crest of Avhite hairs on the vertex has a black tuft on each side ; frons 

 without dust, broad, almost twice as broad as the distance between the 

 basal ocelli. The face and the cheeks are entirely of a pale yellow 

 colour ; the whitish circular brush is surrounded below by dark, but 

 not black, hairs. Very characteristic are the antennae, as shown in 

 Wiedemann's figure. The first joint has only whitish hairs. Beard 

 white. Proboscis entirely black, 5 mm. long ; palpi very long, as long- 

 as one third of the proboscis, with scarce and thin hairs. 



The hairs of the pleurae are partly white and partly black ; on the 

 mesopleura there is a white vertical stripe, with a black one on each 

 side ; breast black-haired. Femora with dense black hairs below ; the 

 four anterior tibiae nearly bare ; the hind tibiae with dark ciliae, but 

 not properly feathered; last tarsal joint black; claws red with black 

 point ; pulvilli yellowish. The yellowish infuscation of the wings is 



