98 EINAB LONNBERG, MAMMALS COLLECTED BY THE SWEDISH ZOOLOGICAL EXPEDITION ETC, 



The skull measurements of my specimens agree on the whole quite well with 

 Dollman's, but are not seldom a httle smaller proving that his type specimen was 

 perhaps a little larger than the common average. The difference in size between 

 Dollman's A. kempi, and his A. pulchellus with regard to the dimensions of the 

 skulls disappears thus completely in fully adult specimens, but the differences in 

 exterior characteristics appear to hold good, at least with regard to such specimens 

 which I have obtained of A. pulchellus. 



From A. ignitus this species is said to differ sby its far paler colour, longer 

 tail, and very much smaller skull with less inflated bullae*.^ Of these characteristics 

 the length of tail evidently is variable. 



Acomys pulchellus Dollman. 



Dollman: Ann. & Mag. Nat. Hist. 1911, Ser. 8, Vol. VIII, p. 127. 



This was the comparatively least numerous of the Acomys on the northern side 

 of Guaso Nyiri. I have only three specimens in the collection saved from the ants. 

 All these are comparatively young and therefore the colour does not fully agree with 

 Dollman's description of the type, but the author quoted has kindly stated the 

 identity. In my specimens the upper parts of the head and the anterior part of the 

 back is slate grey. The posterior part of the back is dull buff, sprinkled and washed 

 with slaty. The flanks and sides of the head are pale snuff brown (Rep. de Couleurs, 

 303, almost paler than shade n:o 1 on the plate). The lower parts are white, sharply 

 marked off from the flanks. This may represent the colouration of the not yet fully 

 mature animals. 



Dasymys savannus Heller. 



Hellbe: Smithson. Misc. Coll., 1911, Vol. 56, N:o 17, p. 14. 



A specimen of this kind was trapped near Itiolu river south of Guaso Nyiri 

 V2 1911. The type locality is stated to be Fort Hall. 



Heller regards this species to be most nearly related to D. mashonce from 

 South Africa. 



Arvicanthis abyssinicus nairobse (Allen). 



Allen: Bull. Amer. Mus. Nat. Hist. 1909, Vol. XXVI, Art. XII, p. 168. 

 A specimen of this race was trapped at Juja farm ^Vi 1911. 



^ Dollman 1. c. 



