Microtus montebelli (Milne-Edwards, 1872) . Rech. Hist. Nat. Mammifères, p. 285.

TYPE LOCALITY: Japan, Honshu Island, Fusiyama .

DISTRIBUTION: Japanese islands of Honshu, Sado, and Kyushu; and Sikotan Island in the Kuriles (Corbet, 1978c).

SYNONYMS: brevicorpus, hatanezumi.

COMMENTS: Subgenus Pallasiinus, oeconomus species group sensu Zagorodnyuk (1990) . Chromosomal data summarized by Tsuchiya (1981). Variation in molar patterns from Holocene and Pleistocene samples exhaustively summarized by Kawamura (1988) in context of defining Pleistocene species endemic to Japan.