Thomomys talpoides (Richardson, 1828). Zool. J., 3:518.

TYPE LOCALITY: Restricted to Canada, Saskatchewan, North Saskatchewan River, Carlton House near Fort Carlton by Bailey (1915:97).

DISTRIBUTION: S British Columbia to C Alberta and SW Manitoba (Canada), south to C South Dakota and N New Mexico, N Arizona, N Nevada, and NE California (USA).

SYNONYMS: aequalidens Dalquest, andersoni Goldman, attenuatus Hall and Montague, badius Goldman, borealis Richardson, bridgeri Merriam, bullatus Bailey, caryi Bailey, cheyennensis Swenk, cognatus Johnstone, columbianus Bailey, devexus Hall and Dalquest, douglasii Richardson, duranti Kelson, falcifer Grinnell, fisheri Merriam, fossor J. A. Allen, fuscus Merriam, gracilis Durrant, immunis Hall and Dalquest, incensus Goldman, kaibabensis Goldman, kelloggi Goldman, levis Goldman, limosus Merriam, loringi Bailey, macrotis Miller, médius Goldman, meritus Hall, monoensis Huey, moorei Goldman, myops Merriam, nebulosus Bailey, ocius Merriam, oquirrhensis Durrant, parowanensis Goldman, pierreicolus Swenk, pryori Bailey, quadratus Merriam, ravus Durrant, relicinus Goldman, retrorsus Hall, rostralis Hall and Montague, rufescens Wied-Neuwied, saturatus Bailey, segregatus Johnstone, shawi Taylor, taylori Hooper, tenellus Goldman, trivialis Goldman, uinta Merriam, unisulcatus Gray, wallowa Hall and Orr, wasatchensis Durrant, whitmani Drake and Booth, yakimensis Hall and Dalquest.

COMMENTS: Formerly included idahoensis and clusius; see Thaeler (1972) and Thaeler and Hinesley (1979). Partial revision by Bailey (1915) and Thaeler (1985). The considerable degree of chromosomal differentiation among geographic representatives of this form (Thaeler, 1985) suggests that more than one biological species is currently included under the name talpoides.