Measurements of Five Subspecies of Synaptomys Borealis 
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: The writer has examined the large series of S. b. dalli in U.S. National Museum in 1931, but did not take measurements. Measurements for 
dalli are quoted from A. B. Howell’s “Revision of the American Lemming Mice (Genus Synaptomys”; North American Fauna, No. 50, p. 24 (1927). 
Specimens of S. b. wrangelt were loaned from Kenneth Racey collection, Vancouver. All other measurements are taken from specimens in National 
Museum of Canada, Ottawa. 
