some new Forms of Ochotona. DS A 
Ochotona sikimaria, sp. n. 
A small Pika closely allied to O. thibetana*, but with 
smaller bullae. 
Size small, much smaller than in the other Himalayan 
species, O. roylec, of which O. hodgsont is a synonym. 
General colour in winter a quite uniform lined brown more or 
less similar to that of a large water-vole or a Sigmodon, the 
general tone ranging from “ Prout’s brown” to ‘ cinnamon- 
brown.” In summer there isa slight indication of lighter 
shoulder- or neck-patches, but the material is not sufficient 
to indicate this satisfactorily. Under surface mixed brownish 
and grey, very much as in thibetana. ars with proectote 
and outer half of metentote black ; metectote with light- 
coloured fluffy hairs ; inner half of metentote whitish ; ex- 
treme edge of ear contrasted white. Hands and feet brownish ; 
sole-tufts blackish brown. 
Skull closely like that of thibetana, and consequently far 
smaller than in roylet, The interorbital constriction is of 
about the same breadth, but the brain-case averages a little 
narrower, The chief difference, however, is in the bulls, 
which are uniformly much smaller than in thibetana, being 
barely over 8 mm. in antero-posterior length, as compared 
with 9 or upwards in thzbetana, and they are also less inflated. 
Dimensions of the type (measured in flesh) :— 
Head and body 165 mm. ; !:ind foot 28 ; ear 19. 
Skull: upper length 36°2; condylo-basal length 34:5; 
zygomatic breadth 16°6; nasals 11x4°6;  interorbital 
breadth 4°1; breadth at back of frontals 11°5; breadth of 
brain-case 13°73; palatal foramina 9; palatal bridge 1:8; 
autero-posterior length of bulla 84; upper molar series 
(alveoli) 74. 
Hab. Sikkim. Type from Lachen, 8,800! ; other speci- 
mens from Chola Range, 12,000! (Blanford), Jongri (Blan- 
jord), and Gnatong, 12,300! (Crump). One specimen from 
B. H. Hodgson’s collection, no doubt obtained when he was 
at Darjiling. 
Type. Adult male. B.M, no. 15.9.1.231. Original num- 
ber 6131. Collected 31st December, 1914, by C. A. Crump. 
Presented by the Bombay Natural History Society. 
‘This is evidently the common Pika of Sikkim, and has 
been obtained there ever since Hlodgson’s time. But for one 
* Although spelt tibetana in the ‘ Recherches,’ this name was published 
as above in the orizinal description in the ‘Nouvelles Archives.’ The 
same invalid change was made in the case of Macacus thibetanus. 
