306 MR. J. L. BONHOTE ON MAMMALS FROM TIBET. | Nov. 14, 
represented in the collection by two spirit-specimens, one of 
which has since been skinned. It appears, although closely 
related to Cricetulus pheeus, to have been hitherto undescribed. 
Size about that of C. pheus. General colour above pale fulvous 
erey, greyer than in C. pheus. 
Kach hair is slate-grey at its base, fulvous for about 3 of its 
distal end and with a black tip. Over the head and fore part of 
the body the fulvous portion of each hair is the more conspicuous, 
but on the hinder part of the back the dark tips predominate and 
a faint dark median dorsal line may be traced. The underparts 
are pure white, the hairs being slate-grey at their base. The line 
of demarcation between the upper and under parts, although 
abrupt, is very uneven in outline. The feet are but scantily 
clothed with hair and are white. The tail is moderately long 
and stout, well clothed with dark brown hairs above and white 
haus below ; the tip is white. 
The whiskers are for the most part black with a white tip, 
some shorter ones, however, being entirely white. 
The skull resembles somewhat “closely that of O. pheus, but is 
slightly larger and the brain-case more inflated and rounder. 
The chief points of difference, when viewed from below, are the 
ereater width of the basioceipital and the much flatter and smaller 
bullae in the new species. Above there is a slight, although very 
constant, difference in the hinder margin of the parietals, which 
are practically straight in outline; whereas in C. pheews there is a 
sharp turn backwards when about two-thirds of their length from 
the middle line. 
Dimensions (of type when in spirit). Head and body 87 mm. ; 
tail 40; hind foot 17; ear 16. 
Skull. Greatest length 28°5 mm.; basal length 24; palatal 
leneth from henselion 12; interorbital breadth 5; greatest 
breadth of brain-case 12°5; width of basioccipital at anterior end 
of auditory bull 3. 
Habitat. Lhasa, Tibet. 
Type. B.M. 5.4.6.4. Collected at Lhasa, Tibet, by Capt. H. 
J. Walton, I.M.S. 
The darker colour of the hinder part of the back combined 
with the general much greyer coloration, and in addition the 
somewhat longer and stouter tail, form characters by which this 
species may be distinguished from C. pheus. The animal, ac- 
cording to Capt. Walton, was extremely common, and was 
swarming in one of the shrines of the Jo Khang Cathedral at 
Lhasa. 
Microtus (PHAIOMYS) WALTON. 
Microtus (Phaiomys) waltoni Bonhote, Abstr. P.Z.S. No. 22, 
p. 14, Nov. 21, 1905. 
a. 2 ad. Lhasa, Tibet. 
Slightly smaller in size than Ph, blythi, to which it is by skull- 
