Bulletin of the Museum of Comparative Zoology 



AT HARVARD COLLEGE. 



Vql. LXII. No. 13. 



THE AMERICAN COLLARED LEMMINGS (DICROSTONYX). 



By Glover M. Allen. 



With One Plate. 



CAMBRIDGE, MASS., U. S. A. 



PRINTED FOR THE MUSEUM. 



February, 1919. 



