128 Field Museum of Natural History — Zoology, Vol. XI. 



Genus TAMIAS Illiger. 



Tamias Illiger, Prodr. Syst. Mamm. et Avium, 1811, p. 83. Type 



Sciuriis striatus Linn. 



Size small for a Squirrel, tail less bushy than in Sciurus; back 

 conspicuously striped; cheeks with pouches which open between the 

 lips and teeth; postorbital processes slender, pointed (spine-like), 

 and directed obliquely backward and downward; infraorbital foramen 

 small and confined to lower part of maxilla. 



Dental formula: I. ^ — ^. C. 5—^, Pm. ^ — ^, M. ^-' ^=20. 

 i-i 0-0 i-i 3-3 



KEY TO OUR CHIPMUNKS. 



A. Back with two pale stripes and several blackish ones; total length (adult) more 



than 9 inches. 

 Rump rufous chestnut. Animal occurs from northern Illinois southward. 



Chipmunk, Tamias striatus, p. 128. 



Rump more cinnamon brown, general pelage grayer. Animal occurs in northern 



Illinois and Wisconsin. Gray Chipmunk. 



Tamias s. griseus, p. 130. 



B. Back with four pale stripes and several dark ones; size .small, usually less than 9 



inches. Animal occurs in northern Wisconsin. Little Chipmunk. 



Eutamias borealis neglectus, p. 135. 



Tamias striatus (Linn.). 

 Chipmunk. Striped Chipmunk. Southern Chipmunk. 



[Sciurus] striatus Linn^us, Syst. Nat., X ed., I, 1758, p. 64. 



Tamias striatus Kennicott, Agr. Rept. for 1856, U. S. Patent Office Rept., 1857, 

 p. 70 (Illinois). Allen, Proc. Bost. Soc. Nat. Hist., XIII, 1869 (1871), p. 189 

 (Iowa). Garman, Bull. Essex Inst., XXVI, 1894, P- 6 (Kentucky). EvER- 

 MANN & Butler, Proc. Ind. Acad. Sci., 1893 (1894), p. 129 (Indiana). Rhoads, 

 Proc. Acad. Nat. Sci. Phila., 1896 (1897), p. 193 (Tennessee). Hahn, Ann. 

 Rept. Dept. Geol. & Nat. Resources Ind., 1908 (1909), p. 471 (Indiana). 

 Howell, Proc. Biol. Soc. Wash., XXII, 1909, p. 59 (Kentucky, Tennessee, 

 Mississippi, etc.). lb., XXIII, 1910, p. 25 (lUinois, Missouri, etc.). 



Tamias striatus lysteri McAtee, Proc. Biol. Soc. Wash., XX, 1907, p. 3 (Indiana). 



Type locality — Southeastern United States. 



Distribution — On Atlantic coast from southern New York and New 

 Jersey to North Carolina, westward through southern Indiana and 

 southern Illinois to eastern Kansas, southward to northern South 

 Carolina, northern Georgia and Tennessee. 



Special characters — Tail only moderately bushy and rather fiat ; back 

 striped; rump rufous chestnut. Its smaller size and rufous chestnut 

 ruinp will distinguish it from its inore northern race, T. s. griseus, 

 but intermediates inust be expected in northern Illinois. 



