The University of Kansas Museum of Natural History received from J. R. Alcorn and Albert A. Alcorn a sizable collection of mammals taken in the summer of 1951 in Alaska. In addition to visiting localities at which they had collected in 1947 and 1948 (see Baker, Univ. Kansas Publ., Mus. Nat. Hist., 5:87-117, 1951) the Alcorns obtained specimens from localities not previously visited in the vicinity of Anchorage and Haines and from Sullivan Island, a small, timbered island in the Lynn Canal. A part of the funds for field work was made available by the Kansas University Endowment Association. The loan of specimens for comparative study from the Biological Surveys Collection of the United States National Museum is acknowledged.