. Distribution of mammals in Colorado. Mammals. 220 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3 Pritchett, 20 (KU); 2 mi. N, 7 mi. W Regnier, 4550 ft., 4 (KU); Furnace [Furnish] Canyon, 10 (DMNH); Craugh Ranch, Cimarron River, 3 (DMNH). Neotoma albigula White-throated Woodrat Neotoma albigula ranges widely in south- western United States and northern Mexico. In Colorado, the species is confined to south- eastern and southwestern parts of the state, where individuals occur at elevations up to about 7000 feet under suitable conditions. Species of Opuntia are important as food and construction mate
. Distribution of mammals in Colorado. Mammals. 220 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3 Pritchett, 20 (KU); 2 mi. N, 7 mi. W Regnier, 4550 ft., 4 (KU); Furnace [Furnish] Canyon, 10 (DMNH); Craugh Ranch, Cimarron River, 3 (DMNH). Neotoma albigula White-throated Woodrat Neotoma albigula ranges widely in south- western United States and northern Mexico. In Colorado, the species is confined to south- eastern and southwestern parts of the state, where individuals occur at elevations up to about 7000 feet under suitable conditions. Species of Opuntia are important as food and construction material. Dens may be con- structed under rock shelters or in more open areas at the base of a shrub or cactus. De- tails of the natural history of N. albigula in Colorado were presented by Finley (1958). Three species of Neotoma occur sympat- rically in parts of southeastern Colorado. Preferred habitat of Neotoma mexicana in- cludes horizontal rock shelters as den sites. Neotoma albigula and N. mlcropus, on the other hand, are woodrats of more open coun- try. Where albigula and micropus occur to- gether, the former species usually utilizes rock shelters, and the latter typically con- structs houses in more open situations. Where these two species are not in competition, their denning habits are very similar (see Finley, 1958:527). In southwestern Colorado, N. albigula is sympatric with N. mexicana and N. cinerea. Habitat segregation is better developed among the woodrats of that area than among those in the southeast. N. albigula occupies the lowest, most arid sites and constructs houses mostly of cactus joints. Neotoma mexicana occurs at moderate elevations in the foothills and lower mountains and shows a predilection for horizontal rock shelters. Neotoma cinerea occurs at moderate to high elevations in the mountains and prefers verti- cal fissures, "chimneys," and caves as shelter. Neotoma albigula brevicauda Durrant Neotoma albigula brevicauda Durrant, Jour. Mamm., 15
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