Thomomys mazama Merriam, 1897 . Proc. Biol. Soc. Washington, 11:214.

TYPE LOCALITY: USA, Oregon, Klamath Co., Anna Creek near Crater Lake, Mt. Mazama, 6,000 ft. (1,829 m) .

DISTRIBUTION: NW Washington through C Oregon to N California (USA).

SYNONYMS: couchi Goldman, glacialis Dalquest and Scheffer, helleri Elliot, hesperus Merriam, louiei Gardner, melanops Merriam, nasicus Merriam, niger Merriam, oregonus Merriam, premaxillaris Grinnell, pugetensis Dalquest and Scheffer, tacomensis Taylor, tumuli Dalquest and Scheffer, yelmensis Merriam.

COMMENTS: Subgenus Thomomys . Revised by Johnson and Benson (1960); considered a subspecies of monticola by Bailey (1915) and Hall and Kelson (1959) but geographic sympatry with monticola in N California documented by Thaeler (1968a). Subspecies listed in Hall (1981:465-467).