28 MAMMALS. 



Mississippi region. Leading varieties are: var. niger, 

 the Southern form, gray to black with the ears and nose 

 white; var. cmereus, the Eastern form, with short ears, 

 scarcely longer than the fur; and var. ludovicianus, the 

 Western form, with high ears and a prevailing tinge of 

 orange red. 



2. S. caro/inensis, Auct. GRAY SQUIRREL. BLACK 

 SQUIRREL. Upper molars 5; varies from grizzly yellow- 

 ish gray to pure jet black; L. 24; T. 13. N. Am., E. of 

 the plains, abundant. 



3. S. hudsonius, Pallas. RED SQUIRREL. CHICKAREE. 

 Chiefly rusty red, back with a wash of brighter red; 

 L. 14; T. 6^. N. Am., rather northerly; abundant. 



3. TAMIAS, Illiger. GROUND SQUIRRELS. 



1. T. striatus, (L.) Baird. CHIPMUNK, GROUND SQUIR- 

 REL. Back and sides with five black stripes; L. 11; T. 

 4^-. Maine to Va., and westward; abundant. 



4. SPERMOPHILUS, Cuvier. GOPHERS. 



1. S. tr/decem/ineatus, ( Mitch. ) Aud. & Bach. 

 STRIPED GOPHER. Dark brown, with light stripes 

 alternating with lines of dots, about thirteen in all; L. 

 10; T. 4. Prairies; Ark. to the Saskatchawan. 



2. S. franklini, (Sab.) Rich. GRAY GOPHER. Yellow- 

 ish gray, mottled with brown; L. 15; T. 5. Prairies; 

 111. and northward. 



5. ARCTOMYS, Schreber. MARMOTS. 



1. A. monax, (L.) Gmel. WOODCHUCK. GROUND HOG. 

 Grizzly gray, varying to chestnut and blackish. Hud- 

 son's Bay to Va., and westward; common. 



