_Remarks._--Topotypes of this subspecies are intergrades between it and _E. q. quadrivittatus_. In a large part of the geographic range of _E. q. hopiensis_ there are numerous, massive outcrops of Mesozoic sandstones, which tend to form cliffs, that are brightly colored with many shades of red. The color which is characteristic of _E. q. hopiensis_ seems to be helpful in adapting this subspecies to this habitat of red sandstone, for these chipmunks are generally found in the rubble and among the pinon at the base of the cliffs. At many places in Utah above these cliffs of red sandstone there are forests predominantly composed of yellow pine. Kelson (1951:42-43) states that "these two habitats are in immediate juxtaposition, the transition from one to the other often occurring in only a few feet ..." and again, "No one to my knowledge, has found any evidence in specimens from Utah of interbreeding of _E. q. hopiensis_ with either _E. q. adsitus_ [= _E. umbrinus adsitus_] or _E. q. umbrinus_ [= _E. u. umbrinus_]." Benson (1935:449) states, "On Navajo Mountain these chipmunks [_E. q. hopiensis_] were most in evidence on rock outcrops surrounded by brush at the lower edge of the yellow pine zone. One was seen at about 9,500 feet in a south-facing rock outcrop near the spruce-fir forest, but no chipmunk of any kind was seen in the forest itself." This suggests that where only _E. q. hopiensis_ occurs on a mountain this subspecies goes higher than on a mountain where _E. u. adsitus_ also occurs. This same relationship between _E. q. quadrivittatus_ and the subspecies of _E. umbrinus_ that occurs in north-central Colorado was pointed out in the account of _E. q. quadrivittatus_. _Specimens examined._--Total number, 68. =Utah=: _Uintah Co._: E side of confluence of Green and White rivers, 1 mi. SE Ouray, 4,700 ft., 3 UU. _Grand Co._: Colorado River above Moab, 1 UU; side canyon of Colorado River above Moab, 1 UU; Moab, up Colorado River, 1 UU; Moab, 4,500 ft., 4 UU; Moab Bridge over Colorado River, 3,995 ft., Moab, 1 UU; Colorado River, 5 mi. E Moab Bridge, 4,000 ft., 1 UU. _Wayne Co._: Fruita, 1 UU. =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)