﻿"6 Annuls of the SovfJi African Mnstuni. 



other backwards. Face broad, with a white toineiitiun on the sides 

 and below, and with white hairs and a few bkick ones in the centre of 

 the sides ; genae Avith white hairs underneatli ; antennae entirely 

 black, the basal joint with black hairs, the third joint long, narrow 

 and pointed as in laticeps, but the upper ciliae seem to be caducous. 



Proboscis entirely black, 8-5-4 nun. long ; palpi not visible and 

 seemingly less developed than is usual. Thorax and scutelluni entii-ely 

 black, with yello^v pubescence, pale yellowish hairs and strong black 

 bristles, which are numerous before the root of the wings and at the 

 hind border of the scutellum ; pleurae and breast with white hairs ; 

 metaj^leural tuft well developed. Squamae pale yellowish, with a dark 

 border showing short black bristly hairs and a white fringe of moderate 

 length. Haltères with blackish stalk and whitish knob. Abdomen 

 entirely black ; it is clothed with long white pubescence and has some 

 black hairs at the base of the segments on the sides ; very character- 

 istic are the narrow ])ands of silvery tomentum on the hind border of 

 the segments from the 2nd to the 6th ; on the hind border of the 

 segments there are besides complete rows of very strong and numerous 

 black bristles ; there is no trace of the white longitudinal stripe of 

 laticeps ; venter black and black haired, with a broad white transverse 

 band in the middle; male genitalia black and black haired. Legs 

 entirely black, with dark yellowish tibiae and basal joints of tarsi; 

 in the female only they are white-scaled on the femora and the tibiae, 

 ])ut those of the hind pair have black scales on the apical half of the 

 femora and the tibiae ; the coxae and the 4 anterior femora are white- 

 pilose near the base ; all the spines are black, those of the tibiae well 

 developed even on the front pair ; middle femora with 4-5. hind 

 femora with 10-12 spines below ; claws l»lack, with narrowly yellow 

 base; pulvilli dark, as long as the claws. Wings greyish-ln aline, 

 pale yellowish at base, with the black basal spot less developed ; they 

 have the typical venation of latlcejis, with this exception, that in both 

 sexes the first posterior cell has a very short stalk, being extended 

 almost to the hind boi'der, as in the genus Sisijrojjhaïius. Alula 

 hyaline, whitish fringed ; praealar hook strong, of a deep black colour ; 

 basal com]) small, black, yellow tomentose ; veins dark, yelloAv at base, 

 especially the auxiliary and the sixth ; base of the first and of sixth 

 vein with a broad yellow pubescence. 



DISCHISTUS, Loew (1855). 



The present genus is rich in species pi'ovided with important char- 

 acters. It can be divided in groups, like those of the genus BomhtjUns. 

 Of these groups, only two are characteristic of the South African 



