48 



is very common in Cameroon. Roubaud states* that in French 

 Congo, where it bites man, and is known by the native names 

 touna, itouna, and yembe, this species is extremely common and 

 very widely distributed : it is absent during the dry season. 



Chrysops bicolor, Cordier. 



Bulletin de la Societe Entomologique de France, Annee 1907, p. 139 

 (1907). Syn. Chrysops nigriflava, Austen, Annals and 

 Magazine of Natural History, Ser. 7, Vol. XX., p. 518 (1907). 



Plate II., fig 14, 



This remarkably handsome black and yellow species has hitherto 

 been received only from German East Africa, whence the Museum 

 possesses three females taken at Neguelo, in Usambara (purchased 

 from H. Rolle). Other specimens from the same locality are in 

 the collection of Professor Bezzi, of Turin, and two females 

 (including the type of Chrysops bicolor, Cordier — a name which has 

 priority over G. nigriflava, Austen), from Amani, German East 

 Africa, t taken by Dr. J. Vosseler, in February, 1906, were forwarded 

 to the Colonial Laboratory of the Museum National d'Histoire 

 Naturelle, Paris, by the Director of the Museum of the Sencken- 

 bergische Naturforschende Gesellschaft, of Frankfort-on-the-Main. 



Chrysops silacea, Austen. 



Annals and Magaziiie of Natural History, Ser. 7, Vol. XX., p. 509 



(1907). 



Plate II., fig. 15. 



Chrysops silacea is a brightly coloured West African species, 



* Bulletin du Museum National d'Histoire Naturelle, Annee 1908, No. 5 (Paris, 1908). 



t Cordier {op. cit., p. 140) makes the misleading statement that Amani is "near 

 Tombovictou." 



