On a new Duiker from Zanzibar. 151 



are mostly referable to T. gracilis, only four belonging 

 to T. nigerice, which may be distinguished by its larger 

 size, longer anterior palatine foramina, and uniformly longer 

 feet, and these in all four examples have well-developed 

 sole-bands. 



XIII. — A neio Duiker from Zanzibar. 

 By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 



The British Museum has received from Dr. W. M. Aders, 

 Government Biologist at Zanzibar, native skins of three local 

 Ungulates, two antelopes and a Potamochoerus. One of the 

 former is that of a Nesotragus moschatus, but the other repre- 

 sents a duiker quite distinct from any species hitherto 

 described. 



In honour of its donor, to whom the Museum is indebted 

 for many Zanzibar mammals, it may be called 



Cepkalophus adersi, sp. n. 



Allied to C. iveynsi*, but with whitish bands across thighs 

 and a white tutted tail. 



Size and general characters about as in C. iveynsi of the 

 Congo. Line along nape with reversed fur, as in that 

 species. General colour of withers and nape dark brown 

 (near mUmmy-brown), which gradually becomes more rufous 

 (darker than " avellaneous ") on the shoulders and flanks, and 

 posteriorly on the rump passes into deep rich chestnut-rufous 

 ("mahogany-red" where richest). Under surface whitish, 

 not sharply defined laterally, the hairs pale drabby at base, 

 whiter terminally ; a mesial rufous patch on the chest. Fore 

 limbs with the avellaneous rufous of the shoulders passing 

 down without interruption, but on the hind-quarters there is 

 a broad whitish band running across the outer side of the 

 hips and separating the chestnut-red of the rump from the 

 rather paler red of the legs ; this band is more or less rufous 

 white where it commences on the sides above the inguinal 

 glands, but becomes nearly pure white posteriorly, where it 



* Figured and described, Ann. Mus. Congo, ii. p. 16, pi. vi. (1901). 



