On tlie Bombyliid Fauna of South Africa (JDiptera). 67 



long. Thorax without distinct bristles ; hind border of the scutellum 

 with thin and long bristly hairs ; squamulae black, and black-haired. 

 Abdomen with long bristly hairs at hind border of the segments. 

 Coxae black and black-haired ; hind femora with 2 spines below on 

 the apical half ; all the spines and the spicules of the legs are black. 

 Wings with no distinct basal comb ; 2nd longitudinal vein straight 

 and gently curved at end ; upper branch of the 3rd longitudinal vein 

 long and oblique, a little S-shaped, not retreating ; small cross-vein 

 considerably before the middle of the discoidal cell ; third posterior 

 cell of a regular trapezoidal shape ; discoidal cell rather broad. 



DlSCHISTUS PECTORALIS, Lo6W (1863). 



A middle-size species of an entirely deep black colour, but clothed 

 with a yellowish furriuess which is black only on the breast. A male 

 specimen from Pretoria, December 12th, 1916 (Gr. A. H. Bedford). 

 Originally described from Bloemfoutein, it is closely allied to the pre- 

 ceding species, being distinct by the greater size, the yellowish fur-like 

 pile of body, the broadly yellow ends of femora and the yellowish base 

 of wings. I have not succeeded in finding characters of distinction 

 between the present species and the West African D. senegalensis, 

 Macq. 



Proboscis entirely black, 3 mm. long ; palpi black ; occiput a little 

 prominent, with yellowish hairs, those of the hind border being 

 darkened. Thorax, scutellum and abdomen Avithout distinct bristles ; 

 mesopleurae with some black hairs ; squamulae dirty whitish, with 

 whitish fringe ; halteres whitish. Hind femora with a complete row 

 of 4-5 long spines below ; spicules of the tibiae long and black. 

 Venation as in the preceding species, but the upper branch of the 

 cubital fork is shorter and more straight, and nearly parallel with 

 the hind border of the wing. 



SOSIOMYIA, gen. nov. 



This new genus has a striking resemblance to Adelidea anomala, 

 from which its type- species is at once distinguished by the conspicuous 

 bristles of the third antennal joint and by the black femora. I 

 believed at first that the present insect might prove to be Adelidea 

 fuscipennis of Macquart because this last species is different from 

 Sobarus anontalus as pointed out by Loew. But Macquart says 

 nothing of the bristles of the third antenna! joint, which are, moreover, 

 more developed than in the genus Acreotriclms of the same author ; 



