FIELD BOOK OF MAMMALS 



Genus Geomys ^ 



Dentition: Incisors, {; Canines, §; Premolars, J; Molars, | 



20. 



Eastern Pocket Gopher.- 



-Geomys tuza 



and related forms 



General Description. — Externally so similar to Thomomys 

 that no special description is needed. See genus Thomomys, 

 page 269. Upper incisors deeply grooved. Plate XXVI. 



Color. — Sexes colored alike; some seasonal variation. 



Fig. 



60. Heads of Pocket Gophers to show incisor teeth. 

 Left, Geomys, right, Thomomys 



Upperparts cinnamon-brown, with yellowish tinge, dorsal 

 region slightly darker than sides; feet whitish; tail whitish; 

 underparts dull buffy. 



Immature duller than adults. 



Measurements. — Males larger than females. Total length, 

 males, 10.8 inches, females, 10 inches; tail vertebras, males, 

 3.6 inches, females, 3.3 inches; hind foot, males, 1.4 inches, 

 females, 1.3 inches. 



Geographical Distribution. — Plains and prairies between 

 the Mississippi River and the eastern foothills of the Rocky 

 Mountains and the eastern Gulf States, 



Food. — Same as for Thomomys, page 270. 



Eneioies. — Same as for Thomomys , page 270. 



^ For a revision of this genus see C. H. Merriam, North A7nerica 

 Fauna, No. 8, i89S- 



292 



