Microtus mongolicus (Radde, 1861) . Melange Biol. Acad. St. Petersbourg, 3:681.

TYPE LOCALITY: Russia, Transbaikalia (Chitinskaya Oblast), Omutnaya River, a tributary to the Amur River .

DISTRIBUTION: Transbaikalia, Mongolia, and NE China.

SYNONYMS: baicalensis, poljakovi, xerophilus .

COMMENTS: Subgenus Alexandromys, middendorffi species group sensu Zagorodnyuk (1990) . Taxonomy reviewed by Allen (1940), Gromov and Polyakov (1977), Corbet (1978c, 1984), and Meier (1983). Karyotypic analyses recorded by Orlov et al. (1983), Yatsenko et al. (1980), and Radjabli et al. (1984) in context of phylogenetic comparisons among Asian species of Microtus .