354 THE QUADRUPEDS OF ARIZONA. 
the most notable are its small size, and elongated tail. 
I met with no Raceoons in Arizona, and it is doubtful if 
any exist; though Procyon Hernandezii, or that variety 
of it which Professor Baird has called P. Mexicana, from 
Sonora, may possibly occur. 7 
Bears of at least two species are found, and are not un- 
common, at least in all the wooded, and particularly the 
mountainous portions of the Territory. The vicinity of 
e San Francisco and Bill Williams Mountains was for- 
merly noted for the numbers of these animals found there, 
though they appear to have somewhat decreased of late. 
The southern Rocky Mountains, and the ranges of- Cal- 
ifornia, seem to be particularly the home of the huge 
Grizzly (U. horribilis), which becomes less numerous 
farther north. A variety, characterized as U. horriæus, 
extends into Mexico. The common Black Bear (U. 
Americanus) also includes Arizona in its very extensive 
ge. 
Order Marsupiata, the Marsupials. A single family 
and genus (Didelphys) represents this remarkable order 
in North America. The Opossum of the Pacific slope 
is the D. Californica, which differs from D. Virginiana 
in several respects. It is smaller, and darker colored, 
especially about the head and feet, which parts are almost 
dusky ; besides which the ears are black, blotched with 
yellow; and the tail also is particolored. 
Order Rodentia, the Gnawers. This extensive order 
embraces animals which, by their individual numbers, and 
their great diversity in form and habit, always constitute 
a marked feature in the fauna of any country which they 
inhabit. It is remarkably well developed in Arizona, 
_ Which has more Species of Rodents than of all other or- 
ders taken together. If the part these animals play be 
