. Fig. 60. Distribution of Perognathus flavus in Colorado. 1. P. f. bunkeri. 2. P. f. hopiensis. 3. P. f. sanluisi. For explanation of symbols, see p. 9. From P. /. hopiensis, the subspecies of ex- treme southwestern Colorado and adjacent areas, P. /. bunkeri differs in larger average cranial size and richer (more buffy and less grayish) dorsal color. Measurements. — External measurements of two males, followed by the average (and extremes) of five females, all from Garden Park, Fremont County, are: 105, 106, (97-104); 50, 48, (41-49); 18, 16, (12-17). Cranial measurements are
. Fig. 60. Distribution of Perognathus flavus in Colorado. 1. P. f. bunkeri. 2. P. f. hopiensis. 3. P. f. sanluisi. For explanation of symbols, see p. 9. From P. /. hopiensis, the subspecies of ex- treme southwestern Colorado and adjacent areas, P. /. bunkeri differs in larger average cranial size and richer (more buffy and less grayish) dorsal color. Measurements. — External measurements of two males, followed by the average (and extremes) of five females, all from Garden Park, Fremont County, are: 105, 106, (97-104); 50, 48, (41-49); 18, 16, (12-17). Cranial measurements are presented in table 16. Remarks.—The color of specimens from eastern Colorado varies widely, particularly in the degree to which the dorsum is overlaid with black hairs. Specimens from Weld County are consistently more heavily washed with black than those from elsewhere on the plains, approaching the color of P. /. piperi. Of comparable color are specimens from 3 mi. W Salida (DMNH 3702) and 16 mi. WNW Canon City (CSU 10210). The dark color of specimens from the Upper Arkansas Valley may indicate the influence of P. f. sanluisi, although the population in the Arkan- sas Valley above Royal Gorge probably is today mostly or completely isolated from the ranges of other populations by marginal or unsuitable habitat. Specimens from Trin- chera (DMNH 390, 391), near Trinidad (KU 59866), and near Rranson (KU 68454) also are relatively dark, approaching the color of P. /. flavus, but other specimens from the
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