Type.—Female, adult, skull and skin, No. 67768 U. S. Nat. Mus.; from Keams Canyon, Painted Desert, Arizona; obtained on July 27, 1894, by A. K. Fisher.
Diagnosis.—Size medium; dorsal dark stripes tawny; crown Drab-Gray; baculum of same proportions as in E. q. quadrivittatus but smaller.
Fig. 2. Localities of specimens examined and probable geographic ranges of the subspecies of Eutamias quadrivittatus and Eutamias umbrinus. The symbols for locality records are as follows: circles, precise localities; triangles, localities known only to county.
Guide to subspecies:
1. E. q. quadrivittatus
2. E. q. hopiensis
3. E. u. umbrinus
4. E. u. adsitus
5. E. u. sedulus
6. E. u. inyoensis
7. E. u. nevadensis
8. E. u. fremonti
9. E. u. montanus
Description.—Color pattern: Head Drab-Gray, with Snuff Brown around margin of crown; facial stripes Sayal Brown with small blackish patches around eye; ears Ochraceous Tawny anteriorly and Pinkish Buff posteriorly; dorsal stripes Tawny, median one sometimes blackish; median pair of dorsal light stripes grayish white, outer pair creamy white; sides Ochraceous Tawny; rump and thighs Cinnamon Buff washed with Pale Smoke Gray; antipalmar and antiplantar surfaces of feet Pinkish Cinnamon; dorsal surface of tail Fuscous Black; ventral surface of tail Ochraceous Tawny, Fuscous Black along margin, Cinnamon Buff along outermost edge; underparts creamy white. Skull: As in E. q. quadrivittatus. Baculum: Same proportions as in E. q. quadrivittatus but smaller.
Comparisons.—See under the account of E. q. quadrivittatus.
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 piñon 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.