. Fig. 40. Distribution of Eutamias minimus in Colorado. 1. E. m. caryi. 2. E. m. consobrinus. 3. E. m. minimus. 4. operarius. For explanation of symbols, see p. 9. when running, and a predilection for more mesic, less rocky habitats than those favored by E. quadrivittatus. Eutamias minimus caryi Merriam Eutamias minimus caryi Merriam, Proc. Biol. Soc. Washington, 21:143, 9 June 1908; type locality, Me- dano Ranch, 15 mi. NE Mosca, Alamosa Co., Colo- rado. Distribution in Colorado.—Northeastern San Luis Valley (Fig. 40). Comparisons.—From E. m. operarius, the subspecies of the mountains s
. Fig. 40. Distribution of Eutamias minimus in Colorado. 1. E. m. caryi. 2. E. m. consobrinus. 3. E. m. minimus. 4. operarius. For explanation of symbols, see p. 9. when running, and a predilection for more mesic, less rocky habitats than those favored by E. quadrivittatus. Eutamias minimus caryi Merriam Eutamias minimus caryi Merriam, Proc. Biol. Soc. Washington, 21:143, 9 June 1908; type locality, Me- dano Ranch, 15 mi. NE Mosca, Alamosa Co., Colo- rado. Distribution in Colorado.—Northeastern San Luis Valley (Fig. 40). Comparisons.—From E. m. operarius, the subspecies of the mountains surrounding the San Luis Valley, E. m. caryi differs in mark- edly paler color and smaller external and cranial size. Eutamias m. caryi is much paler in color than E. m. consobrinus, to which it is similar in size. E. m. caryi and E. m. minimus are of comparable size and both are pale- colored races of semiarid shrublands. Measurements.—Mean (and extreme) ex- ternal measurements of seven males, followed by those of five females, all from the type locality, are: (186-200), (192- 198); (83-92), (85-96); (30-31), (29-31). Selected cranial measurements are presented in table 8. Remarks.—The pale grayish color and ob- scure dorsal stripes of E. m. caryi distinguish the subspecies readily from least chipmunks of the Sangre de Crista Range. In color, E. m. caryi superficially resembles E. m. minimus of northwestern Colorado and adjacent areas, and approaches the color of E. m. cacodemus of the Badlands of South Dakota. Probably there is no justification, however, for the state- ment by A. H. Howell (1929:42) that "Cary's chipmunk is closely related to typical mini- mus . .," although both subspecies obviously are well adapted to arid to semiarid shrub- lands. For a description of the habitat of E. m. caryi, see Warren (1910a). Eutamias m. caryi is adapted to life on stabilized dune sands and on the pale, alkaline soils of the extensive
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