﻿On the BoiiihijUid Fa una of Hmitli Africd (Diptera). 51 



brown or bhiclc bristles, more niiiuerous lu the feinule ; tliese luiirs 

 become shorter and whiter below, and besides the eye-borders show a 

 broad baud of silvery scales. Eyes of the male of smaller size, with 

 equally small areolets, and more separated than in the other species, 

 their distance at the narrowest point being three times as broad as the 

 breadth of tlie ocellar triangle; frontal tria,ngle very broad and not 

 triangular, clothed with very long and erect, bristly, black hairs, and 

 with short, silvery, scaly hairs on the front half, continued on the 

 cheeks ; face clothed with long white hairs, and with numerous, long 

 and strong curved bristles of a white colour, some of which near the 

 middle are black. In the female the frons is exceedingly broad, 2^ 

 times as broad as the eye ; on the first half it is clothed with short 

 white hairs, on the basal half it is bare and rather shining, and there 

 and also on the sides it bears very numerous erect black bristles ; face 

 with white iiairs and scaly silvery ones near the eye-borders, with 

 numerous and strong white bristles and 2-3 black ones near the 

 middle and on the sides above. On the genae there are no distinct 

 bristles in either sex ; the genae and the lower part of the cheeks are 

 provided with long white hairs. Antennae entirely black, with the 

 tirst joint long, almost 4 times as long as the globular second joint, 

 with long black hairs and some black ones intermingled ; third joint 

 not longer than the two first joints taken together, slender, linear, less 

 broadened at the base. Proboscis entirely black, 4-5-5 mm. long, the 

 basal ring, like the peristome, with a yellow border ; palpi very thin, 

 black, almost bare, with a few dark hairs near the end. Tlior-ax black, 

 a little shining, witii a faint dark-grey dust, clothed with long 

 greyish hairs, which, viewed from the front, are shining white, and on 

 the pleura and breast with quite white hairs. There are very numerous 

 black bristles forming a com])lete row on the fore border, another row 

 on the sides from the humeri to the postalar cell, a rich tuft below the 

 notapleural line and a row at the hind border of the mesopleurae. 

 Scutellum dark red, with black base and black hind border, clothed like 

 the thorax, and with long black bristles on the disc and on the hind 

 border. Squamae dirty white, with a narrow dark border and with a 

 white fringe ; haltères yellowish ; metapleural tuft white. Abdomen 

 entirely black, with a very long pubescence coloured like that of the 

 thorax, and strongly tuft-shaped ; on the hind borders of the segments 

 there are complete rows of very numerous and long l)lack bristles. 

 Venter black, with white hairs and numerous black bristles ; chiefly 

 towards the end of the abdomen the bristles are exceedingly numerous, 

 long, and inti'icate. Legs pale yellow, with the last joint of the tarsi 

 black ; the femora are black with yellow end, but are closely covered 



