﻿120 Annals of the South African Mnseiun. 



2 (3). Wings hyaline, with a less defined basal infuscation; second lonjjfi- 



tudinal vein with the u ual less deep loop at end hesjjcrns, Rossi. 



3 (2). Wings entirely blackish-brown, with hyaline spots in the centre of 



the cells ; second longitudinal vein exceedingly looped at end. 



vinula, sp. nov. 

 •i (1). Thorax, scutelluni and abdomen with bright orange tomentum 

 abdomen of an orange yellow colour, with a black middle stripe ; 

 legs orange-colour ..... /ulvipes, Loew. 



Petrorossia HESPERUS, Eossi (1790). 



There is a female of large size of this Mediterraueau species from 

 Hex River (Cape) (Dr. L. Pcriuguey), Jauuary 3rd, 1883, but without 

 a head, and it cannot be ascertained if the example belongs to the var. 

 tro2)icalis or not. The wings have the basal half infuscated, and there 

 is a short appendix at the l)ase of the upper branch of the cubital fork. 



Petrorossia vinula, sp. nov., (^ , $ . 



Closely allied to the preceding, but at once distinguished on account 

 of its peculiar wing pattern and venation. 



Type (^ and type $ , a single pair from Hex liiver (Cape), 

 December, 1889 (Dr. L. Péringuey), labelled by Bigot as " Lijijira 

 vimda " — a nauie which has never been published. Bigot has evidently 

 placed the 6]>ecies in the genus Litjyra on account of the strong terminal 

 loop of the second longitudinal vein ; but in this genus the form of 

 this loop is a very different one, the end of the second vein being 

 strongly recurrent ; there are, moreover, 4 submarginal cells, and the 

 position of the discal cross-vein is as in Lomatia. 



Length of body 6'5-8 mm. ; of a wing 7"5-9 mm. ; of the Aving 

 spread 1 6'5-20 mm. Head black, grey-dusted ; occiput well developed, 

 deeply bilobate above, with a short pale yellowish pubescence ; 

 ocellar tubercle small, rounded, with lilackish pubescence ; fi'ons 

 with long, blackish, erect hairs and short yellowish pubescence on fore 

 half; face grey-dusted, with yellowish pubescence. Antennae entirely 

 black, short ; first joint black-haired in the male, with some yellowish 

 hairs below in the female ; third joint with the basal part broad and 

 discoidal, the styliform part long and ending in a pencil of sparse 

 hairs. Proboscis short, black. Thorax and scutelluni entirely black, 

 a little shining, with pale yellowish pubescence, yellow tomentum and 

 yellowish bristles ; pleurae with pale grey dust, with whitish hairs on 

 propleuni, mesopleura and sternopleura. Squamae dirty whitish, 

 with a pale fringe ; haltères yellow. Abdomen black, rather shining, 

 witli yellow tomeutiun and pale yellow hairs ; on tlie sides near the 



