Perognathus parvus (Peale, 1848) . Mammalia in Repts. U.S. Expl. Surv., 8:53.

TYPE LOCALITY: USA, Oregon, Wasco Co., probably near The Dalles .

DISTRIBUTION: Great Basin from S British Columbia (Canada), south to E California and east to SE Wyoming and NW Arizona (USA).

SYNONYMS: amoenus Merriam, bullatus Durrant and Lee, clarus Goldman, columbianus Merriam, idahoensis Goldman, laingi Anderson, magruderensis Osgood, lordi Gray, mollipilosus Cones, monticola Baird, olivaceus Merriam, pierus Goldman, trumbullensis Benson, yakimensis Broadbrooks.

COMMENTS: Reviewed by Verts and Kirkland (1988, Mammalian Species, 318). Probably includes xanthonotus Grinnell.