1903.] Allen, Mammals from Northeast Siberia. 135 



These specimens are exceedingly uniform in color, the upper 

 parts being dark gray, with a barely perceptible wash of 

 brownish over the median area from the middle of the back 

 posteriorly. The soles of the feet are clothed with very long, 

 thick, closely matted woolly fur, of a grayish brown color. 



Measurements. Ten specimens (6 males and 4 females) measure as 

 follows: Total length, 395 (372-420) mm.: tail vertebrae, 171.4 (154- 

 1 92) ; hind foot, 63.6 (57-69) . An average adult skull has a total length 

 of 52 and a zygomatic breadth of 31 mm. 



In addition to the above described series of ten specimens 

 from Marcova, Mr. Buxton obtained at Gichiga and at Mar- 

 co va, a series of 20 hunters' skins to illustrate the color varia- 

 tion to which this species is subject. The exact locality of 

 these specimens is unknown, but they must have come from 

 the general region tributary in trade relations to these points. 

 These are complete skins except that they generally lack the 

 feet. There are also 6 hunters' skins obtained by Mr. Bogoras 

 at Marcova, which lack tail and feet. These six agree in 

 coloration with the above-described Marcova skins collected 

 and made up as specimens by Mr. Buxton. 



The Buxton series of 20 hunters' skins is deserving of 

 special mention on account of the wide color variations they 

 present. Eleven of them are like the 16 dark gray speci- 

 mens already enumerated and call for no special remark. Of 

 the other 9, three are albinistic, pure white below as in 

 normal specimens, with the rest of the pelage dull light creamy 

 brown, with the tail and ear-tufts somewhat darker than the 

 general coloration. The remaining six have the general col- 

 oration of the body (the median ventral surface excepted) 

 light ashy gray, many shades lighter than the dark gray 

 series ; three of them have the tail and ear-tufts bright red. 

 They thus agree with the winter pelage of Sciurus vulgaris 

 varius (Kerr), of Scandinavia and eastward to northern and 

 central European Russia, as defined by Barrett-Hamilton 

 (/. c., p. 6). The other three have dusky brown ear-tufts with 

 a faint reddish tone, and dusky reddish brown tails, with 

 more or less reddish on the crown and at the base of the ears, 



