. Distribution of mammals in Colorado. Mammals. 174 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3 Perognathus flavus Silky Pocket Mouse Perognathus flavus is a mammal of the central and southern parts of the Great Plains and the Mexican Plateau. In Colorado it is widespread on the eastern plains, extending in the Upper Arkansas Valley to the vicinity of Salida, at about 7000 feet. In the San Luis Valley, the species is widespread at about 7600 feet, occurring to at least 8300 feet along the Conejos River. A third population occurs in Colorado only in western Montezuma County. The three areas of oc
. Distribution of mammals in Colorado. Mammals. 174 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3 Perognathus flavus Silky Pocket Mouse Perognathus flavus is a mammal of the central and southern parts of the Great Plains and the Mexican Plateau. In Colorado it is widespread on the eastern plains, extending in the Upper Arkansas Valley to the vicinity of Salida, at about 7000 feet. In the San Luis Valley, the species is widespread at about 7600 feet, occurring to at least 8300 feet along the Conejos River. A third population occurs in Colorado only in western Montezuma County. The three areas of occurrence of the species in Colorado are separated by strong ecological barriers that doubtless preclude direct genetic communication between the populations. Typical habitat is semiarid grasslands on light, sandy soils, but shrub- lands also are occupied. Rurrows typically are beneath Yucca, Opuntia, or low shrubs. Some ecological data on P. flavus were pro- vided by Banta and Norris (1968). Maxell and Brown (1968) studied habitat prefer- ences of the species in eastern Wyoming; P. flavus was found to utilize grass associations, whereas flavescens was more prevalent in shrub communities. For details on growth and reproduction of silky pocket mice in New Mexico, see Forbes (1964). Perognathus flavus bunkeri Cockrum Perognathus flaws bunkeri Cockrum, Univ. Kan- sas Publ., Mus. Nat. Hist., 5:205, 15 December 1951; type locality, 1 mi. E Coolidge, Hamilton Co., Kan- sas. Distribution in Colorado.—Plains of east- ern two-fifths of state, west in Arkansas Val- ley to vicinity of Salida (Fig. 60). Comparisons.—From P. /. flavus, the sub- species of New Mexico and western Texas, P. /. bunkeri differs in larger average cranial size (except occipitonasal length and width of interparietal) and more buffy (less pinkish) dorsal color, slightly less heavily overlaid with black. From P. /. sanluisi, the subspecies of the San Luis Valley, P. /. bunkeri differs in larger cranial size (excep
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