by P. S. Kershaw. 29 



10. SCOTOPHILIA NIGRITA DINGANI, Smith. 



<$ . 834. Moseley, Natal. 

 £. 6th April, 1914. Durban. 

 - . No locality. 

 Fore-arms 51, 53, 51 mm. 



11. — Ch^rephon pumilus, Cretzsch. 



$ . 851. Berea, Durban. 

 <£ . 21st October, 1913. Durban. 

 - . 995. Moseley, Natal. 

 Fore-arms 37, 38, 37'8 mm. 



The distinction between C. pumilus and C. limbatus, Pet., is one of 

 colour only. The measurements are the same in both species and 

 give no assistance. 



On the material at present available in the British Museum, it 

 would seem that the two are in reality the same species. They are 

 never found together in any one area, but grade into one another 

 somewhat as follows. Pumilus holds North-East Africa, south to 

 Kenia and Kilimanjaro, where it begins to grade into limbatus. 

 Limbatus extends down to Zambesia in the south and into Angola on 

 the west. South of Zambesia pumilus reappears. 



It is often impossible to decide to which species specimens obtained 

 in the gradation areas should be assigned. The amount of white on 

 the under-surface and the colour of the wings vary in British Museum 

 specimens according to locality and may be set out thus : 



Assigned to pumilus . 



(a) Little or no trace of white. Occasionally a few white 

 hairs at elbow or base of thighs. Wings dark brown. 

 Sudan and Natal. 



(b) A conspicuous band of white hairs between wing and body. 

 Wings dark brown. Kenia and Kilimanjaro. 



Assigned to limbatus : 



(c) Under-surface white, except throat and upper chest, 

 Wings white with greyish tips. Zanzibar, 



