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



^- "s 



Area of Intergradation 



Map illustrating approximate distribution of Chipmunks (belonging to the genus Tamias) in 

 eastern United States. 



In the dotted areas between the ranges given for the different races either or both may occur, 

 together with intermediate forms. 



Tamias striatus (Linn.). Type locality — -Southeastern United States. Descrip- 

 tion as previously given. 



Tamias s. griseus Mearns. Type locality — Hennepin Co., Minnesota. Descrip- 

 tion as previously given. 



Tamias s. lysteri (Richardson). (Fauna Bor. Amer., I, 1829, p. 181.) Type 

 locality — Penetanguishene, Georgian Bay, Ontario, Canada. Paler and 

 somewhat longer than striatus; rump and thighs yellowish red. 



Tamias s. venustus Bangs. (Proc. Biol. Soc. Wash., X, 1896, p. 137.) Type lo- 

 cality — Stilwell, Boston Mountains, Indian Territory. Size about the same 

 as griseus, but colors brighter and back stripes much shortened. 



