Microtus fortis Buchner, 1889 . Sci. Res. Przewalski's Exp. Cent. Asia. Zool., ser. 1, 3:99.

TYPE LOCALITY: China, Inner Mongolia, Ordos Desert, Huang Ho Valley, Sujan .

DISTRIBUTION: Transbaikalia and Amur region (U.S. S. R.) south to lower Yangtse Valley (China).

COMMENT: Subgenus Lasiopodomys; see Chaline, 1974, and Chaline and Mein, 1979; but also see Ognev, 1950, Mamm. U.S. S.R., Adjac. Count. Engl, transl., 1964:1 -626, who placed this species in Arvicola; Anderson, 1960, Gromov and Polyakov, 1977:290, Meier, 1978, Trudy Zool. Inst., Leningr., 75:3-62, and Gromov and Baranova, 1981:208, placed it in the subgenus Microtus . Includes calamorum; reviewed by Meier, 1978, who considered fortis close to maximowiczii and sachalinensis .

ISIS NUMBER: 5301410008080012001.