﻿616 Prof. Mario Bezzi's Report on a Collection of 



This species seems, however, to be decidedly variable. 

 I have in my collection 9 $ and 7 Ç from Upper, Middle 

 and South Italy, Sardinia and Corsica, Portugal, Greece 

 and Syria. Of these specimens, ten have the appendix on 

 the upper branch of third vein ; one has an apjsendix also on 

 the inner side of the discal cell ; twelve have the wings 

 hyaline, the others infuscated ; two have the femora wholly 

 or in greater part yellow. The female has normally the 

 wings hyaline and the upper branch without appendix 

 (five specimens out of seven), and the femora are more 

 yellow. 



17. Petrorossia letho, Wiedemann (1828). 



Anthrax longitarsis, Becker (1902), from Egypt, is with- 

 out doubt a synonym of this species, which seems to be 

 widely spread in Africa. The female has no appendix at 

 the fork of the third vein, hyaline wings and yellow 

 i'emora ; the male has also no appendix (but one has an 

 appendix on the anterior angle of the discal cell), but the 

 femora are wholly or partly black ; the wings are darkened 

 in the basal half in two specimens and hyaline in one. 



Four specimens of both sexes from North Nyasa, 

 Akamanga, South Rukuru River, October 10, 1909, and 

 Songwe River, September 17, 1909 (Dr. J. B. Davey). 

 Tlie species is already known from Nubia, Sahara and 

 Alexandria. 



Wiedemann records also the variable colour of the legs ; 

 Loew in 1860 has it under Exoprosopa, but in the " Berlin 

 Entom. Zeitsch.," xvi. p. 77, he says that it is a species of 

 Argyramocha, near hespcrus. 



18. Petrorossia fnlvipcs, Ijoevf (1860). 



A single male from North Nyasa, Florence Bay, 

 February 1, 1909 {Dr. J. B. Davcy), of this elegant species, 

 agrees very well with Loew's description. The wings are 

 strongly darkened on the basal half, the limit of the dark 

 patch running obliquely from the end of the first vein to 

 the apex of the anal cell. The appendix of the fork of 

 the third vein is present upon one wing only. 



19. Petrorossia gratiosa, sp. no v. (Plate L, fig. 14.) 

 ^. Length, 5 mm. 



A very small, pretty species, allied to the preceding one, but 

 abundantly distinct by the wholly orange-red abdomen and different 

 venation. 



Head velvety black, the frons shining in the middle, clothed with 



