1905. | MR. J. L. BONHOTE ON MAMMALS FROM TIBET. 307 
characters closely allied, though widely differmg in colour. 
General appearance above fulvous grey, slightly greyer over the 
anterior part of the body; below very pale buff. Each hair is 
slate-grey from its base and for the greater part of its length, 
with a fulvous subterminal portion and dark tip. On either side, 
between the limbs, the dark tips are absent, leaving a clear fulvous 
patch. Interspersed in the fur are a few thin black bristles. 
The feet ave whitish, both palms and soles are 5-tuberculate. The 
tail is bicolor. The ears small and sparsely covered with hairs 
similar in colour to those on the rest of the body. Mamie eight 
in number, four pectoral and four inguinal. 
Skull. The dental characters are practically identical with those 
of Ph, blythi. The skull itself is very similar in general outline, 
but slightly smaller; this is especially noticeable in the bulle, 
Text-fig. 53. 
A, upper, and B, lower right molar series of Microtus waltoni. 
which do not stand out so prominently from the rest of the 
cranium. 
Dimensions of type (fvom spirit), Head and body 98 imm. ; 
tail 30; hind foot 17; ear 10:5. 
Skull. Greatest length 28 mm.; basilar length 24:5; zygomatic 
breadth 16°5; interorbital breadth 4; length of nasals 7; dia- 
stema 8°2; palatal length 15; length of molar series (text-fig. 53) 
(alveolt) 7. 
Habitat. Lhasa, Tibet. 
Type. B.M. 5.4.6.5. 2 ad. Collected by Capt. H. J. Walton, 
1. M.S. 
This interesting species cannot well be confused with any other, 
