Allen, Mammals from Northeast Siberia. 



133 



white above, strongly varied with long black-tipped hairs, 

 and with a tinge of buffy brown; below similar but more 

 strongly washed with buffy brown. Eyelids black; a broad 

 superciliary stripe and cheeks white; an indistinct blackish 

 lateral line of short hair along the sides of the neck ; fore feet 

 (present in only one specimen) gray blotched with blackish; 

 hind feet above gray like the back, and pale buffy white below. 

 Fourteen specimens in alcohol, collected by Mr. W. Jochel- 

 son at Verkhne Kolimsk, on the Kolyma River, in December, 

 1901, are similar in coloration, except that some of the speci- 

 mens are more tinged with buffy, especially on the tail and 

 feet. These specimens afford the following measurements: 



MEASUREMENTS OF Sciuropterus russicus. 



An adult male skull has a total length of 42 mm. and a 

 zygomatic breadth of 25 rmn. 



Without other material it is impossible to compare the 

 present series with the Flying Squirrel of northern Europe, 

 commonly known as Sciuropterus volans (Linn.). As, how- 

 ever, the Mus volans Linn. 1758 (and earlier in Syst. Nat. and 

 Faun. Suecica) was based primarily on the Sciurus volans of 

 Seba and other references to the American animal, the name 



