306 APPENDIX A 



Similar to the Sze-chwan form in essential characters, but 

 with longer tail, entirely white belly without central line 

 (one specimen with a few pale buffy hairs along the mesial 

 line of the belly), and with the tail usually black above to 

 the tip. 



Dimensions of the type (measured in flesh) : — 



Head and body 78 mm. ; tail 144 ; hind foot 28 ; ear 15. 



Skull : greatest length 23*2 ; condylo-incisive length 20 ; 

 zygomatic breadth 12*7 ; nasals 9 ; interorbital breadth 4*2 ; 

 palatilar length 8*7 ; palatal foramina 46 ; upper tooth- 

 series 3'6. 



Hab. as above. 



Type. Adult female. B.M. no. 12, 8, 5, 62. Original 

 number 52. Collected 22nd September, 1911. 



These are the first specimens of the Asiatic Zapus received 

 by the British Museum, and, so far as I know, the first that 

 have been obtained since the Paris Museum received the 

 examples from Sze-chw^an described by M. Pousargues. 

 They are therefore a most acceptable addition to the Museum 

 collections. 



The Kan-su form is evidently closely allied to that from 

 Sze-chwan, but has a longer tail (126, 137, and 144 mm. in 

 three specimens as compared with 95, 103, and 120) and is 

 practically without the ventral stripe characteristic of the 

 latter. One specimen (no. 60) has a few of the mesial hairs 

 of the abdomen washed with buffy, and this indicates the 

 affinity of the two forms. In a similar way one specimen 

 (no. 61) out of three has a white tail-pencil, like all three of 

 the true setchuamis. 



16. Ocliotona syrinx^ Thos. 



c?. 34. 42 miles S.E. of Tao-chou, Kan-su. 12,000'. 



The typical specimens were obtained at 10,600' on 

 Mount Tai-pei-san, some 200 miles further east on the same 

 mountain-chain. 



17. Ochotona causa, Lyon. 



c?. 48, 51 ; ?. 20. 40 to 46 miles S.E. of Tao-chou. 

 9500-10,000'. 



