. Fig. 72. Distribution of Onychomys leucogaster in Colorado. 1. O. I. arcticeps. 2. O. I. pallescens. For explanation of symbols, see p. 9. Onychomys leucogaster arcticeps, Hollister, Proc. Nat. Mus., 47:439, 29 October 1914. Distribution in Colorado.—In suitable habitat on eastern plains, westward to Wet Mountain Valley and Upper Arkansas Valley; North Park; northwestern Colorado, eastward to Elkhead Mountains (Fig. 72). Comparison.—From O. I. pallescens, the subspecies of west-central and southwestern Colorado and the San Luis Valley, O. I. arc- ticeps differs in slightly smaller avera
. Fig. 72. Distribution of Onychomys leucogaster in Colorado. 1. O. I. arcticeps. 2. O. I. pallescens. For explanation of symbols, see p. 9. Onychomys leucogaster arcticeps, Hollister, Proc. Nat. Mus., 47:439, 29 October 1914. Distribution in Colorado.—In suitable habitat on eastern plains, westward to Wet Mountain Valley and Upper Arkansas Valley; North Park; northwestern Colorado, eastward to Elkhead Mountains (Fig. 72). Comparison.—From O. I. pallescens, the subspecies of west-central and southwestern Colorado and the San Luis Valley, O. I. arc- ticeps differs in slightly smaller average ex- ternal size and duller (less reddish) dorsal color. Measurements.—Average (and extreme) external and cranial measurements of four males, followed by those of four females, all from east-central Colorado, are: (128- 151), (139-158); (34-46), (38- 42); (20-23), (20-23); —, (16- 17); condylobasal length, (), (); zygomatic breadth, (), (); interorbital constriction, (), (); length of maxillary toothrow, (), (). A male from Adams County weighed Remarks.—J. A. Allen (1896:243) reported a single specimen from Three Forks, about 9000 to 9500 feet, on Little Snake River, 30 mi. above Baggs, Wyoming. There is no reason to doubt that locality, but probably the ele- vation is in error. Three Forks is situated at an elevation of about 7100 feet. Three Forks
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