Taxonomy of the Chipmunks, Eutamias quadrivittatus and Eutamias umbrinus

=Colorado=: Moffat Co.: 11 mi. W and 11 mi. N Rangely, 6,000 ft., 3. Rio Blanco Co.: White River, 5 BS. Eagle Co.: McCoy, 2 BS. Mesa Co.: 1-1/2 mi. S Loma, 4,600 ft., 1. Gunnison Co.: 1 mi. E Somerset, 6,100 ft., 1. Montrose Co.: 1 mi. E Naturita, 5,900 ft., 1. Dolores Co.: 1 mi. N Cahone, 6,900 ft., 1. Montezuma Co.: 1 mi. S Cortez, 5,000 ft., 1; Mesa Verde, 25 mi. SW Mancos, 7,000 ft., 2 BS.

=Arizona=: Navajo Co.: Keams Canyon, 80 mi. N Holbrook, 15 BS. Apache Co.: Summit, 8,000 ft., Luka Chukai Mountains, 15 mi. E Luka Chukai Navajo School, 8 BS; Wheatfield Creek, W slope Tunicha Mountains, 7,000 ft., 3 BS.

=Eutamias umbrinus= (J. A. Allen)

Diagnosis.--Size medium; pelage dark; sides dark; narrow cranial breadth; baculum distinguishable from that of any other species (E. palmeri excepted) by the combination of width of base mo