Clethrionomys sikotanensis (Tokuda, 1935) . Mem. Coll. Sci. Kyoto, 106:241.

TYPE LOCALITY: U.S. S. R., R.S.F.S. R., Sakhalin Obi., Sikotan Isl .

DISTRIBUTION: Poronaisk Raion and S.W. Sakhalin; Sikotan and Kunashir (Kurile Isis.); possibly Rishiri Isl.

COMMENT: Allocated by Corbet, 1978:99, and Aimi, 1980, Mem. Fac. Sci. Kyoto Univ., Ser. BioL, 8: 35-84, to rufocanus; Gromov and Polyakov, 1977, [Voles (Microtinae), Fauna U.S. S.R.], Nauka, Moscow and Leningrad, 3(8): l-502, and Imaizumi, 1972, Mem. Nat. Sci. Mus. Tokyo, 5: 131 -139, provided evidence of specific status. See Imaizumi, 1971, J. Mamm. Soc. Jpn., 5:99-103, Gromov and Polyakov, 1977:149, and Gromov and Baranova, 1981: 179, for discussion of distribution.