Microtus maximowiczii (Schrenk, 1859) . Reisen und Forsch, in Säugeth. Amurlande St. Petersburg., 1:140.

TYPE LOCALITY: Russia, Chita Oblast, upper Amur region, mouth of Omutnaya River .

DISTRIBUTION: From E shore of Lake Baikal to upper Amur region, E Mongolia, and NE China (Heilongjiang).

SYNONYMS: ungurensis.

COMMENTS: Subgenus Alexandromys, maximowiczii species group sensu Zagorodnyuk (1990) . Reviewed by Gromov and Polyakov (1977), Corbet (1978c), Orlov and Kovalskaya (1978), and Meier (1983). Additional intraspecific analyses of chromosomal polymorphism provided by Kovalskaya (1977).