184 TAMIAS., 
35. Tamias. Chipmunks, 
Lit: Pp or: M2 = 20 or 22. 
[—I] I—I] [==] eg 
J. A. Allen. A review of some of the North Amertcan Ground 
Squirrels, Bull. Am. Mus. Nat. Hist., 1890, p. 45. 
Tamias Illig., Prodr. Syst. Mamm. et Av., 18121, p. 83. Type 
Scrurus striatus Linneus, 
Tenotts Rafin., Am. Month. Mag., 1, 1817, p. 362. 
Kutamias Trouess., Le Nat., 11, 1880, p. 86. 
Tail short, not bushy, narrow; cheek pouches large; ears without 
tufts. Skull narrow anteriorly; superior outline convex; postorbital 
processes slender, directed backward and downward; antorbital 
foramen oval: zygomata expanded and depressed anteriorly; upper 
g PI 
premolars either two or one, 
Fia, 22, TAMIAS OBSCURUS., 
Field Columbian Mus, Coll, Nat, size 
Upper roorh ROW LOWER TOOTH ROW, 
Enlarged & times Enlarged & times, 
A, Butamias. 
Skull with superior outline highest over parietals; orbital foramen 
a narrow, slit-like opening; rostrum compressed; nasals short, slightly 
narrowed posteriorly; pterygoid fossa long and wide; audital bulle 
large 
