408 Mr. 0. Thomas on 



Bat tlie Hami Pikas differ so constantly from it in the 

 cranial characters above described, that they clearly cannot 

 be referred to it j and as there is lio indication of inter- 

 gradation I cannot now call hamica a subspecies oi pallasi^ 

 although this may possibly prove hereafter to be the proper 

 relative position of the two forms. 



Externally I can lind no difference between the two 

 animals wiiich might not be explainable as due to the 

 deteriorated condition of the type. 



Mr. Carruthcrs informs me that there are no Pikas in the 

 main Tliian Shan range, and from the decided Altai relation- 

 ship of the Hami Mts. in other respects, I think it probable 

 that, when certainly identified, 0. ijallasi will prove to be an 

 inhabitant of the Altai area. 



4G. Ochotona (Pika) alpina, Pall. 



(?. 189, 190, 191; ? . 192, 193. Tannu-ola Mts.,N.W. 

 Mongolia. 6000-8000'. 



c^. 197, 19«, 199. Kunderlun Mts., Atchit :Xor, N.W. 

 Mongolia, 8000'. 



These specimens agree very well with an example from 

 Tyechta, on the Katun R., W. Altai, received from the 

 Tomsk Museum, and nearly a topotype of the species. 



47. Ochotona (Pika) hyperborea, Pall. 



S. 182* (skull only). Syansk Mts., W. of L.Baikal. 

 5000'. 



Tiie animal belonging to this skull measured : — 

 Head and body 155 mm. ; hind toot 25 ; ear 18'5. 



48. Lepiis sp. 



? . 204. Atchit Nor, N .W. Mongolia. 4500'. 

 cf . 229 (and extra skull). Upper Black Irtish R., E. 

 Dzungaria. 1000'. 



^ . 256. Bogdo-ola Mts., !S.E. Dzungaria. 6000'. 



XLI. — Three small Mammals from S. America. 

 By Oldfield Thomas. 



Vampyrops zarhinus incarum, subsp. n. 



General characters as in ixm zarhinus, with which it shares 

 the small separated incisors and all other characters of 

 importance; but size markedly less, the skull smaller in all 



