114 



distinguished, inter alia, by the presence of a pair of pearl-grey 

 stripes on the anterior portion of the thorax, and by the shape of the 

 abdominal spots. 



Tabanus argenteus, Surcouf. 



Bulletin du Museum National d'Histoire Naturelle, Annee 1907, 

 p. 264 (Paris, 1907). 



PLATE X., FIG. 75. 



The type of this species, which belongs to the Naturhistorisches 

 Museum, Hamburg, is from the Gaboon, French Congo, where it 

 was collected in 1881 by M, Soyaux. According to Surcouf and 

 Roubaud,* this species seems not to occur at Brazzaville, French 

 Congo, although (during the French Expedition to French Congo 

 for the Study of Sleeping Sickness) three females were received 

 from the district called Boula N'tangou, on the plateaus about one 

 hundred kilometres to the west of Brazzaville : they were collected 

 during the transitional period at the end of the wet season. For 

 the opportunity of figuring Tabanus argenteus, which is not yet 

 represented in the British Museum (Natural History), acknowledg- 

 ment is due to M. J. R. M. Surcouf, of the Museum National 

 d'Histoire Naturelle, Paris. 



Tabanus gratus, Loew. 



Ofvers. af Kongl. Vetensk. Alcad. Forhandl., XIV., 1857, p. 340 

 (1858) : Dipteren-Fauna Siidafrika's, p. 42 (1860). 



PLATE X., FIG. 76. 



The range of this species, which was originally described from a 

 specimen from Kaffraria, Cape Colony, is now known to extend 

 to the north-east and north as far as Somaliland, the Anglo-Egyptian 



* Bulletin du Museum National d'Histoire Naturelle, Ann6e 1908, No. 5 ( Paris, 

 1908) ("Tabanus argentatus "). 



