88 Annals of the South African Museum. 



the base into the oral cavity long white hairs. Thorax very stout, 

 broad and short, quadrate, shining black, finely punctate ; on the back 

 it is clothed with a very short white pubescence, which on the sides is 

 longer and 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 mesopleurae ; metapleurae bare. Scutelluin like the thorax 

 and likewise clothed with a short and obtuse, white pubescence ; 

 mesophragma concealed. Squamulae white, witli a narrow yellowish 

 border and a short white fringe ; halteres white. Abdomen broader 

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

 clothed with short, whitish pubescence, 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 pubescence ; femora shining black, reddish-yellow 

 above and at end ; middle femora with a row of long black hairs 011 

 front side ; tibiae and tarsi reddish, with yellowish spicules, but 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 discoidal 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 enlarged ; the frons 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 



