76 Annals of the South African Museum. 



species is intermediate between the non-clavate form of simplex and 

 pennipes and the very clavate form of the following species ; it is well 

 figured by Becker. Strongly characteristic of the species is the tuft 

 of black hairs on the under side of the base of the antennae, which is 

 very strikingly within the brush. The beard is blackish, while in the 

 two preceding species it is white. Proboscis black, short, only 

 2'5-o mm. long; palpi black, thin, with short black pile. The face is 

 distinctly yellow on the under side below. Scutellum black. Claws 

 red, with black point ; pulvilli yellowish ; hind tibiae with long and 

 thin ciliae outwards, which are not continued on the praetarsus. 



CORSOMYZA HIRTIPES, Macquart (1840). 



Closely allied to nigripes a,nd of equal size, but at once distinguished 

 by the form of the third aiiteimal joint, by lacking the black hairs at 

 the base of the antennae and by the colour of the legs. 



Macquart has described the female (?) from the Cape ; in the 

 collection there are two males and one female from Namaqualaiul, 

 Port Nolloth (Cape), August, 1890 (E. M. Lightfoot). 



Both sexes are coloured alike, the pubescence being of a paler colour 

 than in most specimens of nigrqtes; the length is 8-9 mm., but one 

 male measures only 6 - 5 mm. Occiput black, whitish -torneiitose on 

 the sides at the border of the eyes, with short and scarce pale hairs ; 

 at the vertex there is the usual transverse crest of erect hairs, which 

 are of a pale yellowish colour, only in the male with some black hairs 

 on the sides near the eyes. Frons shining black, with erect black 

 hairs ; only near the antennae is a circlet of pale yellowish hairs ; it 

 is in the male as broad as twice the distance between the basal 

 ocelli, and in the female it is more than twice as broad as in the male. 

 Face entirely yellow in both sexes, black only in the hind part of the 

 geiiae and on the chin ; the brush is shaped as in ni grimes, and is 

 likewise surrounded with black hairs, which are less developed in the 

 female, but beneath, at the base of the proboscis, there is a broad tuft 

 of black hairs, triangular in shape, with the vertex directed forwards 

 and the base merged in the black beard. 



Antennae black, with the first joint short, densely clothed with long 

 pale-yellowish hairs radiating all round, with some black hairs inter- 

 mingled beneath, but not forming a distinct black tuft within the 

 brush ; third joint very long and thin, filiform, with the last fourth 

 part abruptly dilated in an ovate club, which is truncate at end. 

 Proboscis black, short, not more than o mm . in length ; palpi thin and 

 long, black, with scarce and short black hairs. Thorax and scutellum 



