. Distribution of mammals in Colorado. Mammals. 1972 ARMSTRONG: COLORADAN MAMMALS 243 7400 ft.; Willow Creek, 1/4 mi. N Gunnison River, 7600 ft.; near junction Red Creek and Gunnison River, 7350 ft.; 1/2 mi. W junction Meyers' Gulch and Gunnison River, 6975 ft.; 1 mi. up Lake Fork, 7290 ft.; 2 mi. up Lake Fork, 7295 ft.; 5 1/2 mi. up Lake Fork, 7400 ft. Microtus mexicanus Mexican Vole Microtus mexicanus was first reported from Colorado by Rodeck and Anderson (1956). To date, all records of occurrence in Colorado are from Mesa Verde National Park. Typical habitat of the species is grassy areas
. Distribution of mammals in Colorado. Mammals. 1972 ARMSTRONG: COLORADAN MAMMALS 243 7400 ft.; Willow Creek, 1/4 mi. N Gunnison River, 7600 ft.; near junction Red Creek and Gunnison River, 7350 ft.; 1/2 mi. W junction Meyers' Gulch and Gunnison River, 6975 ft.; 1 mi. up Lake Fork, 7290 ft.; 2 mi. up Lake Fork, 7295 ft.; 5 1/2 mi. up Lake Fork, 7400 ft. Microtus mexicanus Mexican Vole Microtus mexicanus was first reported from Colorado by Rodeck and Anderson (1956). To date, all records of occurrence in Colorado are from Mesa Verde National Park. Typical habitat of the species is grassy areas in wood- lands of Pinus ponderosa. According to An- derson (1961:55), the Mexican vole inhabits drier, more open sites on Mesa Verde than does Microtus montanus, and sites with less cover than are utilized by Microtus longi- caudus. Microtus mexicanus mogollonensis (M earns) Arvicola mogollonensis Meams, Bull. Amer. Mus. Nat. Hist., 2:283, 21 February 1890; type locality, Baker's Butte, Mogollon Mountains, Coconino Co., Arizona. Microtus mexicanus mogollensis, V. Bailey, N. Amer. Fauna, 53:204, 1 March 1932. Distribution in Colorado.—Known at pres- ent only from Mesa Verde, Montezuma County (Fig. 84). Measurements.—External measurements of an adult male, two young adult males, and two young adult females from Mesa Verde are: 152, 141, 145, 145, 143; 33, 28, 34, 30, 28; 21, 20, 18, 20, 18; 14, 14, 14, 13, 16; a female weighed Cranial measurements are pre- sented in table 22. Remarks.—Specimens of M. mexicanus from Colorado agree well in external and cra- nial details with undoubted mogollonensis from Coconino County, Arizona. I have not examined specimens of M. m. navaho, pres- ently known only from Navajo Mountain, San Juan Co., Utah. Judging from the description of that subspecies (Benson, 1934:49), animals from Utah are considerably paler than those from Mesa Verde, or elsewhere in the range of M. mexicanus. Records of occurrence.—Specimens examined, 25, distrib
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