(hi tin- Unii/h///!/*] l'\iinni of Smith Africa (Dipt era). 119 



stripes of paler dust, one along the middle line, the others along the 

 dorsocentral lines. The hairs in front and on the sides are pale 

 yellowish or whitish ; in the female there are besides numerous short 

 bristles on the notopleural line. Pleurae with pale grey dust, and with 

 white scales on the lower part of the mesopleura and on the steriio- 

 pleura ; the mesopleural hairs are greyish. Scutellum grey-dusted 

 at base and with yellow tomeutum, shining black at the hind border 

 and on the sides ; the bristles of the hind border are yellow or 

 yellowish. Squamae dirty whitish, with pale yellow border and white 

 fringe ; halteres yellow, with darker knob. Abdomen black, grey- 

 dusted ; the segments have whitish scales at the base on the sides and 

 on the hind border, and yellow scales in the middle ; first segment 

 with long, dense, whitish hairs, the other segments with scarce, grey 

 or pale yellowish hairs, .more developed in the male. The ventral side 

 of the tergites has a narrow yellow border ; venter grey-dusted, white- 

 scaled, with greyish hairs. Male genitalia grey, with the lower border 

 of the lamellae reddish ; terminal tuft of the female genitalia of 

 golden yellow colour. Coxae and femora black, grey-dusted, wliite- 

 scaled, whitish haired ; the 4 anterior femora only narrowly yellow at 

 end : middle femora with 3-4 yellow spines on the middle of the 

 anterior side ; hind femora with 6-7 whitish or yellow spines below, 

 which in the male are very long, forming near the base a tuft of 

 4-5 longer ones placed in many rows. All the tibiae are pale yellowish, 

 with numerous and long yellowish or whitish spicules and spurs, even 

 on the front pair. Tarsi pale yellowish, darkened at end, Avith whitish 

 or yelloAvish spines at end of the two first joints ; claAvs pale yellowish 

 with black tips ; pulvilli Avhitish yellow, longer in the male than in 

 the female. Wings hyaline, vitreous, iridescent ; veins black, the 

 first and the extreme base of the others being yellow ; alula pale 

 yelloAvish, Avith a short Avhite fringe. In the present species the 

 recurrent A r einlet dividing the first from the second submarginul cell is 

 about twice or even a little more as long as the basal part of the 

 upper branch of the cubital fork looking, therefore, as not being the 

 continuation of the second longitudinal vein. 



PETROROSSIA, Bezzi (1908). 



This genus is Avell represented in the Ethiopian Fauna, and there 

 are also some species in South Africa ; those in the collection can be 

 distinguished as follows : 



1 (4). Thorax, scutellum and abdomen with yellowish or greyish tomentum 

 abdomen black, hut with reddish yellow sides; legs pale yellow. 



