1 5 Bulletin American Museum of Natural History. [Vol. XIX, 



12-15 mm. long, and of a deeper, more reddish brown, varied 

 with black, giving a much darker general effect. The ventral 

 surface is whitish gray with a very slight wash of buff. The 

 color of the young in the woolly immature coat is in general 

 similar to that of fall adults, but of a duller tint above and 

 more plumbeous below. 



Three additional specimens, taken at Indian Point, Siberia, 

 by Mr. Bogoras, seem not in any way distinguishable from the 

 Gichiga and Marcova specimens collected by Mr. Buxton. 



The following table gives the external measurements of 

 1 8 specimens, taken by Mr. Buxton from the fresh specimens, 

 arranged in the order of size, with which are included the two 

 principal measurements of the skull, when the skull is not too 

 much broken to be available. The specimens range in age 

 from young adults to very old, some of the last six being still 

 partly in immature pelage. 



MEASUREMENTS OF Microtus kamtschaticus. 



The above-described specimens of Microtus from Gichiga and 

 Marcova have been compared .with a series from Kamchatka 

 identified by Mr. Gerrit S. Miller as M. kamtschaticus, and do 

 not appear to either Mr. Miller or myself to differ from them. 



