536 Mr. K. V. Wrougliton 07i East African 



7. Tragulus canescens terutus, subsp. n. 



Closely resembling T. canescens in coloration, but markedly 

 smaller. The dark-coloured nape characteristic of unibrinus, 

 Miller, entirely wanting. 



Hab. Terutau Island, Straits of Malacca. 



Tyjje. Adult male. B.M. no. 9. 11. 1. 159. Original 

 number 2438. Collected 2r)tb October, 1909. 



Seven specimens examined. 



LXVIII. — East African Eorms o/ Arvicanthis abyssinicus. 

 By R. C. Wroughton. 



Having had occasion to lay out the specimens in the Natural 

 History Museum of Arvicanthis from British Africa, I find 

 that several well-marked local races can be distinguished. 

 Arvicanthus abyssinicus was described by Rijppell from 

 fciimen and 8hoa in Abyssinia. Besides cotypes, the Museum 

 possesses quite a long series from many parts o£ Abyssinia. 

 Thence to German East Africa, whence Matschie described 

 his A. neumanni (a very much smaller animal), the only 

 name I have been able to find is nairobce, Allen. This is 

 clearly a geograpliical race of abyssinicus , which it resembles 

 in colour and from which it ditf'ers chiefly in size. 



The additional forms I have been able to discriminate are : 

 one from Naivasha, closely resembling nairobce, its near 

 neighbour, in size and colour, but easily separable by the 

 sliape of the skull ; also a reddish colour variety from 

 Unyoro, and a blackish one from Mt. Elgon. 



Key to the Subsjjecies of A. abj^ssinicus. 

 A. General colour ^-eyisli (near *' hair- 

 brown"). 



a. Siza larjjer; bind foot=30 ram., 



greatest length of skull = 36. 



Hands and feet grey. (Abyssinia.) (1) «6«/.s.52?z?'cws, Riipp. (s.s.). 



b. Size smaller; hind foot::^27 mm. or 



less, gi-eatest length of skull = ci4 



or less. 

 a '. Hands and feet grey ; skull very 

 broad and .stoutly built, supra- 

 orbital crests strongly marked. 



(Nairobi.) (-) «• nairobce^ Allen. 



6 . Hands and feet yellow ; skull nar- 

 row, slenderly built, supraorbital 

 crests much less developed. 

 (Naivasha.) (•'^) «• prceceps, subsp. n. 



