. Fig. 44. Distribution of Ammospermophilus leu- curus in Colorado. 1. A. I. cinnamomea. 2. A. I. pennipes. For explanation of symbols, see p. 9. generally low. Although McCoy and Miller (1964) reported on the distribution of Am- mospermophilus leucurus in Colorado, details of its natural history have not been investi- gated. Ammospermophilus leucurus cinnamomeus (Merriam) Tamias leucurus cinnamomeus Merriam, N. Amer. Fauna, 3:52, 11 September 1890; type locality, Echo Cliffs, Painted Desert, Coconino Co., Arizona. Ammospermophilus leucurus cinnamomeus, Mearns, Bull. Nat. Mus., 56:299, 13
. Fig. 44. Distribution of Ammospermophilus leu- curus in Colorado. 1. A. I. cinnamomea. 2. A. I. pennipes. For explanation of symbols, see p. 9. generally low. Although McCoy and Miller (1964) reported on the distribution of Am- mospermophilus leucurus in Colorado, details of its natural history have not been investi- gated. Ammospermophilus leucurus cinnamomeus (Merriam) Tamias leucurus cinnamomeus Merriam, N. Amer. Fauna, 3:52, 11 September 1890; type locality, Echo Cliffs, Painted Desert, Coconino Co., Arizona. Ammospermophilus leucurus cinnamomeus, Mearns, Bull. Nat. Mus., 56:299, 13 April 1907. Distribution in Colorado. — Southwestern part of state, typically above 5500 feet (Fig. 44). Comparison. — From A. I. pennipes, the subspecies to the north in Colorado, A. I. cin- namomeus differs in slightly smaller average cranial dimensions and more vinaceous color. Measurements.—External measurements of three females from Four Corners are: 223, 229, 222; 66, 72, 82; 40, 39, 39. External meas- urements of a male and two females from Bedrock, Montrose County, are: 213, 230, 224; 56, 70, 60; 40, 43, 41. Selected cranial measurements are presented in table 11. Remarks.—McCoy and Miller (1964) re- viewed the distribution of Coloradan sub- species of A. leucurus (see remarks in the account of A. I. pennipes, below). The char- acters by which these two subspecies are dif- ferentiated are fairly subtle and large series of specimens of similar age and taken at com- parable seasons will be necessary before the extent of variation in the populations can be fully appreciated. McCoy and Miller (op. cit.:9S) referred specimens from Bedrock to A. I. pennipes. Direct comparison was made by me of skins from Bedrock with topotypes of pennipes from Grand Junction and specimens of cinna- momeus from Montezuma County. To my eye, material from Bedrock more closely re- sembles the latter population. An old female (WC 2993) from Bedrock has the general appearance of pennipes w
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