Rausch (Jour. Washington Acad. Sci., 40:135, April 21, 1950) proposed the name _Microtus miurus paneaki_, with type locality at Tolugak Lake (lat. 68° 24' N, long. 152° 10' W), Brooks Range, Alaska, for a meadow mouse of the subgenus _Stenocranius_. This place is only approximately forty miles east and north of the type locality of the earlier named _Microtus muriei_, also a member of the subgenus _Stenocranius_. Large series of specimens of this subgenus, from the Arctic Slope of Alaska, are in the Museum of Natural History of the University of Kansas. Study of these indicates that the differences, which Rausch (_op. cit._:136) described as distinguishing his _M. m. paneaki_ from _M. muriei_, result from differences in age of the specimens, and possibly in part from differences in seasonal condition of pelage. For example, Rausch thought that _M. m. paneaki_ was larger than _M. muriei_ but our specimens reveal that such is not the case. The measurements given below of the type specimen of _M. muriei_ (after Nelson, original description) and measurements (in parentheses) of an immature female (43807 K. U.) of _Microtus miurus muriei_ from Chandler Lake, 68° 12', 152° 45', 2900 ft., Alaska, show close correspondence in size. Total length, 119 (122); tail vertebrae, 24 (24); hind foot, 20 (20); condylobasal length, 24.3 (24.5); zygomatic breadth, 10.7 (11.0); greatest width of braincase, 9.0 (9.0); length of nasals, 6.5 (6.0); basal width of rostrum, 4.0 (4.3). In the light of all of the evidence now available, it seems best to treat _Microtus miurus paneaki_ Rausch as a synonym of _Microtus muriei_ Nelson. Quay (Jour. Mamm., 32:95, February 15, 1951) identified fifty-eight specimens from the Seward Peninsula of Alaska as _Microtus miurus oreas_ Osgood. Through the courtesy of Dr. Charles P. Lyman, fifteen of Quay's specimens in the Museum of Comparative Zoology at Harvard College have been examined by one of us (Hall). These specimens are as follows: Lava Lake (43378, 43379, 43381, 43382, 43386, 43467 and 43478); Mt. Boyan (43384, 43385, 43463 and 43477); Anvil Hill [= Peak], Cooper Gulch (43377, 43464 and 43473); ----? Lake, 43383. Although we are not prepared to say that these specimens are _M. m. muriei_, they seem to resemble _M. m. muriei_ as closely as they do any other named form and we here refer them to that subspecies.