Mammals from East Africa. 127 



reddish tint is much more evident. At the same time, in a 

 series of twelve specimens from the type locality the slate- 

 grey colour is dominant. In addition to the general grey 

 tint of the dorsal surface, the speckled feet, greyish-white 

 belly, dark tail, and the small size of the skull are all 

 characters that serve to distinguish this Acomys from the 

 other East African species of this group. 



Acomys pulchellus, sp. n. 



? . 1757, 1776. Chanler Falls, Eusso Nyiro. 



A small species resembling A. kempi in general colour, 

 but with the spines on the dorsal surface shorter and more 

 slender. 



lu size and general proportions about as in A. percivali ; 

 tail rather longer. Hair on back composed of slender 

 spines, those on the hind-quarters and rump markedly 

 thinner and shorter than in the two species described above. 

 General colour of dorsal surface very much as ia A. kempt, 

 darker on the head and down the middle of the back. 

 Flanks richer and darker in colour (between tan colour no. 1 

 and snuff-brown no. 4, ' Repertoire de Couleurs'), the buff 

 tint sharply marked off from the white belly. Backs of 

 hands and feet white. Entire underparts white. Tail as 

 in A. kempi. 



Skull rather smaller than that of kempi, with a com- 

 paratively broad brain-case and short nasals. 



Dimensions of the type (measured in the flesh) : — 



Head and body 84 mm.; tail 94 ; hind foot 15 ; ear 15. 



Skull : greatest length 28 ; basilar length 21 ; condylo- 

 incisive length 25-3 ; zygomatic breadth 12'2 ; interorbital 

 breadth 4*5 ; breadth of brain-case (across squamosal 

 region) 12-5; length of nasals lO'Q; width of palate (in- 

 side m^) 3; length of palatal foramina 6-1 ; length of upper 

 molar series 4. 



Hab. Chanler Falls, Eusso Nyiro. Altitude 3000 feet. 



Tyjje. Adult female. Original number 177G. Collected 

 by Messrs. Kemp and Percival on January 24th, 1911. 



The small size of this species, together with the short and 

 slender spines on the dorsal surface, distinguishes it from all 

 the other East African members of the genus. 



Acomys ablutus, sp. n. 



A small species related to Acomys ivilsoni, Thos., but dis- 

 tinguished by its smaller size and less rufous colouriu"-. 



