. Distribution of mammals in Colorado. Mammals. 1972 ARMSTRONG: COLORADAN MAMMALS 277. Fig. 100. Distribution of Mustela jrenata in Colo- rado. 1. M. f. longicauda. 2. M. f. neomexicana. 3. M. /. nevadensis. For explanation of symbols, see p. 9. ada southward to northern Bolivia. In Colo- rado, long-tailed weasels occur statewide, from lowest elevations to well above timber- line in the mountains. They are to be found in forested areas, open woodlands, on the open plains, or in alpine situations. Quick (1951) discussed food habits of M. frenata in Gunnison County. Feeding be- havior was descri
. Distribution of mammals in Colorado. Mammals. 1972 ARMSTRONG: COLORADAN MAMMALS 277. Fig. 100. Distribution of Mustela jrenata in Colo- rado. 1. M. f. longicauda. 2. M. f. neomexicana. 3. M. /. nevadensis. For explanation of symbols, see p. 9. ada southward to northern Bolivia. In Colo- rado, long-tailed weasels occur statewide, from lowest elevations to well above timber- line in the mountains. They are to be found in forested areas, open woodlands, on the open plains, or in alpine situations. Quick (1951) discussed food habits of M. frenata in Gunnison County. Feeding be- havior was described by F. W. Miller (1931b), Warren (1932a) presented notes on breeding of long-tailed weasels in the state, and F. W. Miller (1930c, 1931a) described molt in cap- tives. The monograph of American weasels by Hall (1951b) contains a review of literature on natural history of M. frenata to that time, as well as a thorough taxonomic treatment of recognized subspecies. Mustela frenata longicauda Bonaparte Mustela longicauda Bonaparte, Charlesworth's Mag. Nat. Hist., 2:38, January 1838; type locality un- certain, possibly Carlton House [Carlton], Saskatch- ewan (see Hall, 1951b: 120-123). Mustela frenata longicauda, Hall, Carnegie Inst. Washington Publ., 473:105, 20 November 1936. Distribution in Colorado.—Plains of east- ern one-third of state (Fig. 100). Comparisons.—From M. f. nevadensis, the subspecies of the mountains and immediately adjacent plains, M. f. longicauda differs in markedly paler dorsal color and generally paler ventral color (in summer pelage), and in larger size both externally and cranially. For comparison with M. /. neomexicana, see account of that subspecies. Measurements.—External and cranial measurements of a male (CSU 10052) from southern Weld County are: 406, 149, 50, 23, weight, 267; condylobasal length, ; zygo- matic breadth, ; interorbital constriction, ; postorbital constriction, ; mastoid breadth, ; length of maxillary toothro
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