. Distribution of mammals in Colorado. Mammals. 1972 ARMSTRONG: COLORADAN MAMMALS 45 otherwise noted): JACKSON COUNTY: Pearl, 9000 ft.; Arapaho Pass; [near] Lake Agnes (Yeager, 1950:329). RIO BLANCO COUNTY: Marvine Lodge (Felger, 1910:146). GARFIELD COUNTY: Trappers Lake (Yeager, 1950:329). GRAND COUNTY: 3 mi. SW Rabbit Ears Pass, 9900 ft. (Vaughan, 1969:53). BOULDER COUNTY: Dixie Lake. GILPIN COUNTY: Moon Gulch (Williams, 1955b:224). PARK COUNTY: Mount Bross. GUN- NISON COUNTY: Gothic Natural Area, 2 mi. NW Gothic, 10,200 ft. (Findley and Negus, 1953:237). EL PASO COUNTY: Summit House, Pikes
. Distribution of mammals in Colorado. Mammals. 1972 ARMSTRONG: COLORADAN MAMMALS 45 otherwise noted): JACKSON COUNTY: Pearl, 9000 ft.; Arapaho Pass; [near] Lake Agnes (Yeager, 1950:329). RIO BLANCO COUNTY: Marvine Lodge (Felger, 1910:146). GARFIELD COUNTY: Trappers Lake (Yeager, 1950:329). GRAND COUNTY: 3 mi. SW Rabbit Ears Pass, 9900 ft. (Vaughan, 1969:53). BOULDER COUNTY: Dixie Lake. GILPIN COUNTY: Moon Gulch (Williams, 1955b:224). PARK COUNTY: Mount Bross. GUN- NISON COUNTY: Gothic Natural Area, 2 mi. NW Gothic, 10,200 ft. (Findley and Negus, 1953:237). EL PASO COUNTY: Summit House, Pikes Peak (Warren, 1942:9). Sorex vagrans Wandering Shrew The wandering shrew is common in mesic situations in the mountains of the western three-fifths of Colorado. Sorex vagrans may be abundant locally, and marked fluctuations in populations have been reported. Spencer and Pettus (1966:680) found synchronous fluctuations in sympatric populations of S. vagrans and cinereus in western Larimer County, and suggested that either the popu- lations were being influenced by the same extrinsic factor or the populations were in- fluencing each other. The preferred habitat of S. vagrans is sim- ilar to that of S. cinereus, although the wan- dering shrew does not typically range to the low elevations frequented by S. cinereus east of the Front Range. The altitudinal range of specimens examined was from 5300 feet to 11,400 feet, with both extremes in Boulder County. Sorex vagrans obscurus Merriam Sorex vagrans similis Merriam, N. Amer. Fauna, 5:34, 30 July 1891; type locality, Timber Creek, 8200 ft., Salmon River [Lemhi] Mountains [10 mi. W Junction, Lemhi Co.], Idaho. Not Sorex similis Hensel, 1855. Sorex obscurus Merriam, N. Amer. Fauna, 10:72, 31 December 1895 (a renaming of Sorex vagrans similis Merriam). Sorex vagrans obscurus, Findley, Univ. Kansas Publ., Mus. Nat. Hist., 9:43, 10 December 1955. Distribution in Colorado.—Mesic habitats in mountains and on high plateaus and mesas of cen
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