if BE = pet 
AMERICAN NATURALIST. 
Vol. I.—OCTOBER, 1867.—No. 8. 
—<»~“o— 
THE QUADRUPEDS OF ARIZONA. 
BY DR. ELLIOTT COUES, U. 8. A. 
(Continued from p. 363.) 
Famy Saccomyide, the Pouched Rats. This is a 
curious and interesting family of Rodents, represented in 
Arizona by quite numerous species. Its several genera 
differ to a remarkable degree in external characters, but 
agree in the possession of very large cheek pouches, open- 
ing outside the small mouth, and capable of enormous 
extension; and in numerous anatomical features. Two 
subfamilies exist in North America,—the Geomyine, 
and the Saccomyine. The former includes the “Gophers” 
or “Salamanders” or “Pouched Rats,” as they are vari- 
ously styled in different sections. They are clumsy, 
thick-set animals, with large heavy heads, short thick 
necks, small inexpressive features, short tails, and very 
strong muscular legs, armed with large claws, eminently 
fitted for digging. They are also wholly nocturnal, and 
live in subterranean galleries which they excavate. The 
Saccomyine, on the other hand, are elegant in shape, of 
pleasing colors, and graceful motions; and though par- 
Entered di Act of C in the year 1867, by the ESSEX INSTITUTE, in the 
Massachusetts. 
AMERICAN NAT., VOL. I. 50 (393) 
