APPENDIX A 307 



These specimens are slightly dai-ker in colour than examples 

 from nearer Tao-choii, the type locality, and are therefore to 

 some extent intermediates between the true cansa and the 

 subspecies next following. 



18. Ochotona cansa viorosa^ subsp. n. 



? . 4. Tai-pai-san, 45 miles S.E. of Feng-siang-fu, 

 Shen-si. 10,500'. 4th August, 1911. B.M. no. 12. 8. 5. 68. 

 Type. 



Size slightly greater than in typical cansa. Colour darker, 

 the hairs of the back more heavily blackened terminally. 

 Under surface with all the hairs broadly washed with dark 

 buffy, instead of, as in true cansa, only those of the middle 

 line being so coloured, the sides of the belly being whitish. 

 Hand and feet darker and more uniformly buffy above and 

 more blackish below, the whitish fringes on either side of the 

 feet, so marked in cansa^ less developed and dull buffy in 

 colour, so that practically the whole of the sole appears 

 sooty brown. 



Skull with rather more strongly convex frontal outline, 

 broader interorbital space, larger brain-case, and broader 

 palatal bridge than in any of the specimens of true cansa. 

 In the type the projecting point representing the posterior 

 part of the septum of the palatal foramina is more developed 

 than usual, but this may be an individual peculiarity. 



Dimensions of the type : — 



Head and body 149 mm. ; tail 8 ; hind foot 27 ; ear 18. 



Skull : greatest length 36 ; condylo-incisive length 34"3 ; 

 zygomatic breadth 18 ; nasals 11 2 x 44; interorbital breadth 

 41 ; breadth of brain-case 142; palatal bridge 2'6 ; upper 

 tooth-series (alveoli) 67. 



Hah. and Type as above. 



In its dull colour this Pika has some resemblance to the 

 0. tibetana of Sze-chwan, but is smaller, with larger bullae 

 and a more bowed frontal outline. Much more material is 

 needed before the true relationship to each other of these 

 allied forms of Ochotona can be clearly understood. 



