EAST AFRICAN MAMMALS IN NATIONAL MUSEUM, 



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MYLOMYS ROOSEVELTI (HeUer). 



Plate 33. 



1910. Pelomys roosevelti Heller, Smithsonian 

 Misc. Coll., vol. 54 [No. 19241, p. 1. 

 February 28. (Nzoia River, Guas 

 Ngishu Plateau, British East Africa; 

 type in U. S. Nat. Mus.) 



1910. Pelomys roosevelti Roosevelt, African 

 Game Trails, Amer. ed., pp. 473, 479; 

 London ed., pp. 485, 490. 



Specimens. — Eighteen, from the follow- 

 ing localities : 



British East Africa: Kaimosi, 15 

 (Heller); Kakumega, 2 (Heller); Nzoia 

 River, Guas Ngishu Plateau, 1 (Heller). 



Specimens from Kaimosi have slightly 

 longer tails and darker colored feet than 

 the type from Nzoia River, but the differ- 

 ence is not great and there is only the 

 one specimen from the type locality. In 

 the Kaimosi series are several very young 

 specimens. The youngest, in which the 

 i. last molars have not yet erupted, are 

 ^ colored above very much like the fully 

 adult but are dark cinnamon buff below, 

 the hairs with ground color dark gray, 

 very different from the clear whitish belly 

 of the adult. Older juveniles, after all 

 the teeth are in place but quite unworn, 

 are much duller above and are becoming 

 more as in the older specimens below — 

 the throat, breast, and posterior under- 

 parts are decidedly whitish. Slightly 

 older specimens, with the teeth showing 

 a little wear, are very much faded out, of 

 a dull bleached brown above, but with 

 the entire underparts in fresh coat like 

 that of the adults. 



For measurements of specimens see 

 accompanying table. 



Genus ARVICANTHIS Lesson. 



1842. Arvicanthis Lesson, Nouv. Tabl.Mamm., 



p. 147. (A. niloticus.) 



1843. Isomys Sundevall, K. Svenska Akad. 



Handl., 1842, p. 219. (A. niloticus.) 



