12U Annals of the South African Museum. 



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



tudinal vein with the u ual less deep loop at end hesperus, Bossi. 



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. 



4 (1). Thorax, scutelluin and abdomen with bright orange tomentum 



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

 legs orange-colour ..... fulvipes, Loew. 



PETBOEOSSIA HESPERUS, Eossi (1790). 



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

 Hex Eiver (Cape) (Dr. L. Pcriuguey), January ord, 1883, but without 

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

 tropicalis or not. The wings have the basal half infuscated, and there 

 is a short appendix at the base of the upper branch of the cubital fork. 



PETROROSSIA VINULA, sp. uov., ^ , 9 . 



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 Eiver (Cape), 

 December, 1889 (Dr. L. Peringuey), labelled by Bigot as " Li/ijira 

 I'inula '' a name which has never been published. Bigot has evidently 

 placed the species in the genus Liijynt 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 submargiual cells, and the 

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



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

 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 blackish pubescence; frons 

 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 scutelluin entirely black, 

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

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

 propleura, mesopleura and sternopleura. Squamae dirty whitish, 

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

 with yellow tomentum and pale yellow hairs ; on the sides near the 



