192 On some new Forms of Ochotona. 
reason or another it has been confused with QO. royle., and 
never distinguished till now. Blanford’s specimens had 
broken skulls, so that he was not able to see the great 
difference in size between it and vroylet, while Bonhote 
unaccountably referred it to hodgson7, a form undoubtedly 
synonymous with voy/e’, as may be seen by the figure of the 
skull given in the original description. 
From roy/et it is not only distinguished by its much 
smaller size, but by its brown instead of grey colour, and the 
absence of any seasonal fulvous mantle. 
But to OQ. thibetana it is far more nearly allied, and can 
only be separated by the smaller bulle. Possibly it may 
prove to be more properly a subspecies of thibetana, but I 
should not be justified in assuming that intermediate speci- 
mens occur without seeing material from the intermediate area 
of Bhotan and South-western Tibet. 
The thibetana group is widely distributed over Tibet and 
China, and the present forms its furthest western extension. 
Ochotona zappeyi, sp. 0. 
Near O. thibetana, but with narrower skull and_ less 
uniformly brown wee 
Size about as in ¢hibetana, though the skull is longer. 
General colour lined blackish grey, this colour covering ‘the, 
greater part of the back. But the shoulders are washed with 
drabby, and there are large post-aural drabby whitish patches 
on each side of the nape. Crown washed with dull drabby. 
Ears with the proectote black at base, grey distally, while in 
stkimaria it is wholly black. Marginal part of inner surface 
brown, inner part grey ; extreme edge white as usual. 
Under surface greyish white, lighter and more sharply defined 
than in thibetana, the chest, however, drabby brown as in 
that animal. Hands and feet whitish instead of pale brown ; 
sole-brushes blackish brown. 
Skull longer and narrower than that of thibetana, with 
very narrow interorbital region and brain-case. Rudimentary 
postorbital processes well marked in the single specimen. 
Bullee narrower and a little longer than in thibetana, much 
larger than in sikimaria. 
Dimensions of the type :— 
Head and body 170 mm.; hind foot 28. 
Skull: greatest length 39. mm.; condylo-incisive length 36 ; 
zygomatic breadth it: 8; nasals 1°33 x45 ; ‘interorbital 
breadth 3° Te post-squamosal breadth 11°35; breadth of brain- 
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