﻿88 Annals of the South African Museum. 



the base into the oral cavity loug white hairs. Thorax very stotit, 

 broad and shoi't, quadrate, shining black, finely punctate ; on the back 

 it is clothed with a veiy short white pul^escence, which on the sides is 

 longer aud forms a narrow white border. The pleurae are clothed with 

 longer white hairs, which form very rich tufts on the notopleural line 

 and on the mesopleui-ae ; metapleurae bare. Scutellum like the thorax 

 and likewise clothed with a short and obtuse, white pul)escence ; 

 mesophragma concealed. Squamulae white, with a narrow yellowish 

 liorder and a short white fringe; haltères white. Abdomen l)roader 

 than the thorax, broader than long, shining lilack, finely punctate, 

 clothed with short, whitish pul)escence, which is denser on the 2 last 

 segments ; first and second segment on the sides with rather long- 

 white hairs ; venter shining black. Legs short and stout ; coxae 

 black, with whitish pul^escence ; femora shining lilack, reddish-yellow 

 above and at end ; middle femora with a row of long l:)lack hairs on 

 front side ; tibiae and tarsi reddish, with yellowish spicules, ]»ut partly 

 black on the middle pair ; last tarsal joint deep black ; claws black, 

 with red base ; pulvilli dirty yellowish. Wings broad and short, 

 suffused with a faint yellowish tint, more intensive at base and at fore 

 border, and fainter at the apex, which is hyaline; veins entirely reddish. 

 Costal cell long and dilated outwardly ; middle cross-vein placed near 

 the tip of the discoid al cell ; 1st, 2nd and 3rd posterior cell of about 

 the same breadth at end, the vein between the 1st and the 2nd rather 

 wavy; anal cell closed and shortly stalked. The venation is typical as 

 in Corsomyza. 



Subfamily PHTHIRIINAE. 



GONARTHRUS, Bezzi. 



This new genus was recently founded by me for my Dischistus 

 cylindricus ; I include here two species described by Bigot and two 

 new ones. The present genus is very distinct owing to its narrow and 

 elongate, cylindrical body, devoid of strong bristles ; the moustache is 

 dense and soft ; the occipital hairs are long and form a very dense 

 crown. The eyes of the male are coalesced for a considerable distance 

 and have the upper areolets enlai-ged ; the fi-ons of the female is 

 rather narrow. The antennae are long, with the third joint linear and 

 provided with a very thin terminal style ; the proboscis is rather 

 short, and sometimes exceedingly short and thick ; the palps are long, 

 two-jointed, with the apical joint produced outwardly and thus at 



