1S75.] inhabiting the Himalaya, Tibet, and the adjoining regions. 127 



mammals described by him from Western Turkestan. I learn that the 

 species identified as Arctomys baibacinus differs from A. bobac in being 

 darker above, and more rufous below. It is a mountain species, whilst A. 

 bobac inhabits the steppes. Dr. Severtzoff suggests that it may be identical 

 with A. robustus (that is, doubtless, with A. Himalayanus) . As A. Hima- 

 layanus extends from Eastern Tibet to the Kuenluen, keeping to great 

 altitudes, above the range of almost every other mammal, it is by no means 

 improbable that it may also occur farther to the north. 



P. S. — Nov. 8th. — In the October number of the ' Annals and Magazine 

 of Natural History' just received, Dr. Anderson has described another marmot 

 from the mountains north of Kabul under the name of A. dichrous. Prom 

 the description this appears to be distinct from A. aureus and the other 

 species referred to above, and it is very probably the form indicated by 

 Burnes and Griffith, a skull of which, as already mentioned, exists in the 

 Society's old collection. 



