98 EINAR LÖNNBERG, 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 little smaller proving that his type specimen was 
perhaps a little larger than the common average. The difference in size between 
DOLLMAN's ÅA. kempi, and his ÅA. 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 ÅA. ignitus this species is said to differ »by 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. 9 
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 (Rép. 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. -< 
HELLER! 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 
"/2 1911. The type locality is stated to be Fort Hall. 
HELLER regards this species to be most nearly related to D. mashone from 
South Africa. 
Arvicanthis abyssinicus nairob&e (ALLEN). / 
ALLEN: Bull. Amer. Mus. Nat. Hist. 1909, Vol. XXVI, Art. XII, p. 168. 
A specimen of this race was trapped at Juja farm '”/1 1911. 
1 DoOLLMAN 1. c. 
