800 MR. OLDFIELD THOMAS ON MAMMALS [Nov. 20, 



3. List of Mammals obtained by Dr. Donaldson Smith 

 during his recent Journey from Lake Rudolf to the 

 Upper Nile. By Oldfield Thomas. 



[Received October 19, 1900.] 



On his return from his recent adventurous journey to the Upper 

 Nile from Somaliland via Lake Rudolf, Dr. Donaldson Smith has 

 been so good as to entrust to me for description the specimens of 

 mammals thai he obtained, and has further been generous enough 

 to present a number of them, including all the types, to the British 

 Museum. 



Owing to the great difficulties of transport large series of 

 specimens were not brought home, nor were many small mammals 

 obtained, but, from the knowledge gained on his previous ex- 

 peditions, Dr. Smith was enabled to select those that were most 

 likely to be interesting, and this knowledge has been rewarded by 

 the considerable proportion of novelty that the examination of 

 his specimens reveals. 



The specimens were mostly prepared by Mr. W. Garble Fraser, 

 who accompanied Dr. Smith as collector and taxidermist. 



1. Colobus abyssinicus 1 poliueus, subsp. n. 



a, b. J $. Omo River, 21 Dec, 1899. (121, 122.) Also a 

 number of native skins. 



Similar in most respects to the typical form, of which the British 

 Museum possesses an original example from Riippell's collection, 

 but the basal two-thirds of the tail, instead of being nearly black, 

 or with a fine sprinkling of white hairs, is grejdsh white with 

 merely a scarce intermixture of black hairs. Below, in the majority 

 of specimens, it is altogether white. The caudal tuft is also of 

 greater extent, aud its hairs longer, so that it approaches the 

 magnificent tuft of C. caudatus. Mantle rather less developed 

 than in true abyssinicus. 



Hob. Omo River, north of Lake Rudolf. 



Type. Female. B.M. No. 0.1 1 .7.3. No. 1 22 of the Donaldson 

 Smith collection. 



In Mr. Oscar Neumann's recent paper 2 on Colobus matschiei, 

 he speaks of the " graumelirte Farbuug des Schwanzes " in the 

 true C. abyssinicus, but in the Riippellian specimen above referred 

 to, as also in some examples from Harris's Nhoan collections, 

 the tail is practically black, and it is possible that the specimens 

 seen by Mr. Neumann really belonged to C a. jiohurus. 



Of this fine Monkey, Dr. Donaldson Smith brought home a pair 

 of properly preserved specimens, with skulls aud all particulars, 



1 Lemur abyssinicus, Oken, Lehrb. Naturg. iii. pt. ii. p. 1182 (1816). 



Mr. de Winton has drawn my attention to this reference, which antedates 

 Riippell's description of " guereza" by many years. L. abyssinicus is clearly 

 the same form as the latter, and e\en the native name " Gucreta " is used for it. 



2 SB. Ges. nat. Fr. Berl. 1899, p. 15. 



