. Fig. 49. Distribution of two species of prairie dogs in Colorado. 1. Cynomys ludovicianus ludovici- anus. 2. Cynomys leucurus. For explanation of sym- bols, see p. 9. Cynomys ludovicianus ludovicianus (Ord) Arctomys ludovicianus Ord, in Guthrie, A new geographical, historical and commercial grammar ..., 2nd Amer. ed., Philadelphia, 2:292, 1815; type locality restricted by Jones (1964:138) to lower slope of the "Tower," sec. 10, T. 34 N, R. 10 W, Boyd Co., Ne- braska. Cynomys ludovicianus, Baird, in Reports of ex- plorations and surveys . . from the Mississippi River to the Pacific


. Fig. 49. Distribution of two species of prairie dogs in Colorado. 1. Cynomys ludovicianus ludovici- anus. 2. Cynomys leucurus. For explanation of sym- bols, see p. 9. Cynomys ludovicianus ludovicianus (Ord) Arctomys ludovicianus Ord, in Guthrie, A new geographical, historical and commercial grammar ..., 2nd Amer. ed., Philadelphia, 2:292, 1815; type locality restricted by Jones (1964:138) to lower slope of the "Tower," sec. 10, T. 34 N, R. 10 W, Boyd Co., Ne- braska. Cynomys ludovicianus, Baird, in Reports of ex- plorations and surveys . . from the Mississippi River to the Pacific Ocean . . , 8(1): 331, 14 July 1858. Distribution in Colorado.—Plains of east- ern two-fifths of state (Fig. 49). Measurements.—Average (and extreme) external measurements of 10 males, followed by those of eight females, all from eastern Larimer County, are: (358-400), (340-400); (71-95), (60-84); (57-63), (55-63); (12-17), (11- 18); mean weight of eight males, (575- 950), and of five females, (785-1030). For cranial measurements, see table 12. Records of occurrence.—Specimens examined, 271, distributed as follows: LARIMER COUNTY: near Round Butte, 3 (CSU); 13 mi. WNW Fort Col- lins, 1 (CSU); 13 mi. N Fort Collins, 2 (CSU); 12 mi. N Fort Collins, 1 (CSU); 3 mi. NW Waverly, 1 (CSU); 13 mi. NNW Fort Collins, 1 (CSU); 10 mi. N Fort Collins, 2 (CSU); 9 mi. N, 1 mi. E Fort Collins, 2 (CSU); Fuqua, 12 mi. NW Fort Collins, 20 (CSU); Wellington, 1 (CSU); 9 1/2 mi. NW Fort Collins, 1 (CSU); 8 1/2 mi. NE Fort Collins, 1 (CSU); 6 mi. N Fort Collins, 2 (CSU); 5 mi. N, 2 mi. W Fort Collins, 1 (CSU); NW of Fort Collins, 1 (CSU); 7 mi. W Fort Collins, 2 (CSU); 2 mi. W


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