TO2 Bulletin American Museum of Natural History. [Vol. XIX, 



at Vladivostok, many collected at Marco va by Messrs. 

 Buxton, Bogoras, and Axelrod, a considerable number from 

 near the mouth of the Anadyr River and at Indian Point, on 

 the extreme northeastern coast of Siberia, collected by Mr. 

 Bogoras, and a small but very interesting collection made 

 near Verkhne Kolimsk, on the middle Kolyma River, by Mr. 

 Jochelson. 



This report is restricted to the material collected by the 

 Jesup Siberian Expedition, and is in no sense intended as an 

 exposition of the mammalian fauna of eastern Siberia. 



In this connection I wish especially to acknowledge my 

 Indebtedness to Mr. Gerrit S. Miller, Jr., Curator of Mammals 

 at the National Museum, not only in securing for me the loan 

 of valuable material for comparison, but also for kind assist- 

 ance and advice. 



The species treated in the present paper number 35, of 

 which 29 are represented by specimens, and 6 are presented 

 simply on the basis of Mr. Buxton's field notes. The number 

 of specimens of mammals in the collection is about 500. Sev- 

 eral of the species here recorded appear to have hitherto 

 escaped recognition. These, including two seals described in 

 a previous paper x based primarily on the Buxton material, 

 are the following: 



Ochotona kalymensis. Lemmus obensis chrysogaster. 



Lepus gichiganus. Phoca hispida gichigensis. 



Citellus buxtoni. Vulpes anadyrensis. 



" stejnegeri. Putorius pygmaeus. 



Evotomys jochelsoni. Erinaceus orientalis. 



latastei, nom. nov. Sorex buxtoni. 



As would be naturally expected, the present investigation 

 brings to light several new illustrations of the intimate rela- 

 tionship of the mammalian fauna of Siberia with that of 

 Alaska. A small shrew (Sorex buxtoni, sp. nov.) finds its 

 nearest relative in Sorex pribilofensis Merriam of the Pribilof 

 Islands; the large spermophile of eastern Siberia finds its 

 nearest ally in the Citellus parryi group of arctic and sub- 

 arctic America, and not in C. eversmanni of the interior of 

 Siberia. The small weasel of eastern Siberia proves not to 



1 This Bulletin, Vol. XVI, 1902, pp. 459-499, figs, i-io; Dec. 12, 1902. 



