Taxonomy of the Chipmunks, Eutamias quadrivittatus and Eutamias umbrinus

by John A. White

Type.—Male, adult, skull and skin, No. 29387/41462 U. S. Nat. Mus. Biol. Surv. Coll.; from Black Canyon, 8,200 ft., White Mountains, Inyo County, California; obtained on July 7, 1891, by E. W. Nelson; original No. 1069.

Diagnosis.—Size medium; sides light; general tone of upper parts light; baculum one of largest in species.

Description.—Color pattern: Head Smoke Gray mixed with Pink-Cinnamon; upper two pairs of facial stripes Fuscous Black or black; submalar stripe Sayal Brown; ear Fuscous or Chaetura-Drab, posterior margin and postauricular patch buffy white; median dorsal dark stripe black with Sayal Brown along margins; lateral dorsal dark stripes black mixed with Sayal Brown or Mikado Brown; outermost dorsal dark stripes Sayal Brown or Mikado Brown mixed with black; sides Ochraceous-Tawny or Tawny; thighs Cinnamon-Buff mixed with Smoke Gray; antipalmar and antiplantar surfaces of feet Cinnamon-Buff; ventral surface of tail Cinnamon-Buff or Ochraceous-Tawny with Fuscous Black around margin and Pinkish Buff around outermost edge; underparts creamy white. Skull: Large; zygomata strong; braincase moderately inflated. Baculum: One of largest in species.

Comparisons.—For comparisons with E. u. umbrinus, E. u. adsitus, E. u. sedulus, and E. u. nevadensis, see the accounts of those subspecies.

Remarks.—The baculum in E. u. inyoensis is like that in E. palmeri.

Specimens examined.—Total number, 46.

Nevada: Elko Co.: Head Ackler Creek, N end Ruby Mountains, 1; Steels Creek, N end Ruby Mountains, 1; Summit Secret Pass, 6,200 ft., Ruby Mountains, 2; Three Lakes, Ruby Mountains, 11; Long Creek, S fork, Ruby Mountains, 4; Harrison Pass R. S., Green Mountain Canyon, 1; W side Ruby Lake, 6 mi. N Elko Co. line, 3; W side Ruby Lake, 3 mi. N Elko Co. line, 8. White Pine Co.: Willow Creek, 2 mi. S White Pine Co. line, Ruby Mountains, 6; W side Ruby Lake, 3 mi. S White Pine Co. line, 5; Overland Pass, E slope Ruby Mountains, 8 mi. S White Pine Co. line, 2.

Utah: Boxelder Co.: Head of George Creek and Clear Creek, 5 mi. S Stanrod, Raft River Mountains, 8,500 ft., 2 UU.

Eutamias umbrinus nevadensis Burt

Eutamias quadrivittatus nevadensis Burt, Jour. Mamm. 12:299, August 24, 1931.