. Distribution of mammals in Colorado. Mammals. 150 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3 T. bottae in Colorado, and that study is fol- lowed in the accounts of subspecies below. Hall and Kelson (1959:413-434) treated Colo- radan valley pocket gophers as subspecies of T. umbrinus. For details on relationships be- tween T. bottae and T. umbrinus, see Hoff- meister (1969). Because of their ecological and economic importance, and also their complex micro- evolutionary history, pocket gophers in Colo- rado have been the subject of more research than any other group of non-game mammals. Much of
. Distribution of mammals in Colorado. Mammals. 150 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3 T. bottae in Colorado, and that study is fol- lowed in the accounts of subspecies below. Hall and Kelson (1959:413-434) treated Colo- radan valley pocket gophers as subspecies of T. umbrinus. For details on relationships be- tween T. bottae and T. umbrinus, see Hoff- meister (1969). Because of their ecological and economic importance, and also their complex micro- evolutionary history, pocket gophers in Colo- rado have been the subject of more research than any other group of non-game mammals. Much of that research has been conducted under the auspices of the Colorado Cooper- ative Pocket Gopher Project, a program in- volving personnel of the Agricultural Experi- ment Station of Colorado State University, the Denver Wildlife Research Center of the Bureau of Sport Fisheries and Wildlife, the Rocky Mountain Forest and Range Experi- ment Station of the Forest Service, and the Colorado Cattlemen's Association. Com- prehensive publications on Coloradan pocket gophers include an ecological account by R. S. Miller (1964), and a semi-technical publica- tion, "Pocket gophers in Colorado" (Hansen, 1960a). For literature on the economic im- portance of Coloradan pocket gophers in the first three decades of the present century, the reader is directed to Annual Reports and Cir- culars of the Office of the State Entomologist. Thomomys bottae aureus J. A. Allen Thomomys aureus J. A. Allen, Bull. Amer. Mus. Nat. Hist., 5:49, 28 April 1893; type locality, Bluff City, San Juan Co., Utah. Thomomys bottae aureus, Goldman, Proc. Biol. Soc. Washington, 48:156, 31 October 1935. Thomomys bottae optabilis Goldman, Jour. Wash- ington Acad. Sci., 26:116, 15 March 1936; type lo- cality, Coventry, 6500 ft., Montrose Co., Colorado (regarded as inseparable from aureus by Youngman, 1958:37). Distribution in Colorado.—Valleys of southwestern part of state, south of Uncom- pahgre Plateau an
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