﻿0)i the Bomhyliid Fcmna of South Africa {Diptera). 163 



Scutellum wholly black, with metallic scales like the thorax. Squamae 

 whitish, with white fringe ; haltères yellow ; plumula white. Abdomen 

 elongate- conical, entirely black, only the hind borders of the segments 

 being a little brownish ; the sides are entirely bare, the first segment 

 only having short white hairs, and the last segment dark scales on the 

 hind border ; at the base of the 2nd, 3rd and 4th segment there seem 

 to be bands of white scales, which are broadly interrupted in the 

 centre ; spines of the ovipositor black. Venter black, with complete 

 bauds of white scales at the base ; last steruite prominent, in the 

 shape of a short keel. Legs black ; front pair wanting in the type, 

 but the front coxae are black, white-tomentose and white-pilose ; 

 middle femora without distinct spines, hind femora with 2-3 at the 

 end, underneath ; spicules of tibiae scarce and short ; claws black, 

 with a short but distinct basal tooth. Wings hyaline, iridescent, with 

 a pale yellowish tint ; basal comb narrow, yellowish ; veins entirely 

 yellow, darkened near the apex and the hind border ; second vein 

 deeply looped at end ; marginal ci'oss-vein straight, but placed much 

 obliquely ; upper branch of third vein strongly retreating at base ; 

 first posterior cell not narrowed at the end, 2nd and 3rd of the same 

 breadth at the end, the vein between them loug and almost straight ; 

 3rd shorter than the 4tli at the base. Discal cross-vein set much 

 before the middle of the discoidal cell, which is narrow, long and 

 acute outwardly, its terminal vein being oblique ; the basal angle of 

 the vein dividing it from the 3rd posterior cell is provided with a 

 stump projecting into the discoidal cell. Anal cell very broadly open 

 at end ; alula hyaline, with a short white fringe ; axillary lobe short, 

 but not very broad. 



HYPERALONIA, Rondani (1863). 



For a long time it was believed that in South Africa there were no 

 representative of this genus, as pointed out in 1886 by Osten Sacken, 

 Avho, however, has overlooked the fact that Exopr. nigripennis Loew, 

 from Mozambique, belongs to the present genus. In 1901 Miss G. 

 Ricardo referred to this genus Anthrax rufa, of Wiedemann, a species, 

 however, which, from the description, is more probably a Lomatia. The 

 genus is certainly poorly represented in the South African fauna, and 

 in the collection thei*e are only 2 examples belonging to 2 species, both 

 belonging to the group of H. nlgripennis, as shown in the following 

 table: 

 1 (4) . Head black ; basal joints of the antennae black and black-haired ; 

 wings equally infuscate, with not distinctly infuscated cross-veins 

 and with the discoidal cell acnte at base. 

 11§ 



