78 Annals of the South African Museum. 



fork shows in both the wings, at the angular basal bend, a short 

 stump of vein, which must be considered as the beginning of the 

 cross-vein Avhich divides the first submarginal cell into 2 cells, as is 

 sometimes the case with C. anceps, Bezzi. 



CORSOMYZA ANCEPS, Bezzi. 



A smallish species, with bright fulvous pubescence and with clavate 

 antennae, distinct by its narrow and conical abdomen, by the dark 

 halteres, and by the reddish-brown tibiae and tarsi. I have described 

 the male in my work on the Bombyliidae of the British Museum. 

 That specimen bears on the wing 3 submarginal cells, making therefore 

 the separation of the genus CallyntJirophora on this character alone 

 very doubtful. There is in the collection a very small female from 

 Namaqualand, Port JSTolloth (Cape), August, measuring only 4mm. 

 in length ; it agrees with the male, with the following exceptions : 

 The frons is more than twice as broad ; the face is dark brownish, 

 with a fulvous brush, which is not marginated with black, but is 

 entirely black below on the geuae and on the chin. Wings exactly as 

 in the male, but without any trace of the 3 submargiual cells. 



CORSOMYZA BICOLOR, sp. nov., . 



A small species allied to the preceding one, but distinct from it and 

 from any other on account of the wholly black facial brush, in the 

 centre of which the radiating hairs of the base of the antennae form a 

 striking yellow tuft. 



Type c? , a single specimen from O'Okiep, November, 1886 

 (L. Peringuey). The possibility is not excluded that the female 

 described above as belonging to anceps may be that of the present 

 species, notwithstanding the great difference in the colour of the facial 

 brush. 



Length of body 7'5 mm. ; of a Aving G mm. ; of wing expanse 14 mm. 

 Head entirely shining black ; occiput with a faint grey tomentum at 

 the sides on the eye borders and with scarce and short yellow hairs above 

 in the middle ; hairs of the vertical crest yellow in the middle and black 

 on the sides ; frons twice as broad as the distance between the basal 

 ocelli, with a middle longitudinal depression and a basal transverse 

 furrow ; the frons is anteriorly broader than in the other species, the 

 antennae being inserted lower down, thus approaching to the condition 

 found in Callyntliropliora ; it is clothed with long, pale-yellow, erect 

 hairs with some black ones forming a transverse band before the 

 ocellar triangle; ocellar tuft pale yellow. Eyes with the upper 



