Editors: E. Raymond Hall, Chairman, A. Byron Leonard, Edward H. Taylor, Robert W. Wilson The pocket gophers of the species _Thomomys talpoides_ in east-central Colorado have long been referred to the subspecies _Thomomys talpoides clusius_ Coues with type locality at Bridger Pass, Wyoming. Recently, two subspecies, _T. t. attenuatus_ and _T. t. rostralis_ (see Hall and Montague, Univ. Kansas Publ., Mus. Nat. Hist., 5(3):25-32, February 28, 1951) were named from along the Wyoming-Colorado boundary with the result that the populations of _Thomomys talpoides_ in east-central Colorado are separated from _T. t. clusius_ of Wyoming by the geographic ranges now ascribed to the recently named _T. t…
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