Microtus roberti Thomas, 1906 . Ann. Mag. Nat. Hist., ser. 7, 17:418.

TYPE LOCALITY: Turkey, Pontus Prov., Sumila, 30 mi. (48 km) S. of Trebizond (= Trabzon) .

DISTRIBUTION: Caucasus Mtns. (U.S. S.R. and N.E. Turkey).

COMMENT: Subgenus Chionontys; see Anderson, 1960:202; related to gud and nivalis (RSH) . Chaline, 1974, included Chionomys within the subgenus Suranomys, but Gromov and Polyakov, 1977:327, regarded Chionomys as a full genus.

ISIS NUMBER: 5301410008080038001.