:;:u 



MONOGRAPHS OF NORTH AMERICAN RODKNTIA. 



localities south of the Mexican boundary. To the westward it ranges to 

 the Pacific, from California northward to Alaska, and doubtless extends 

 northward to the limit of trees. It is extremely abundant in the wooded 

 mountainous portions of Colorado, where, as I am informed by Dr. Coues, 



who speaks from reports given him on the spot, it sometimes becomes a con- 

 siderable article of diet. The same naturalist also found it no less numer- 

 ous in the Sweetgrass Hills, or "Three Buttes" of Northern Montana, where 

 numerous individuals were secured. Though chiefly a woodland animal, it 

 is not seldom seen ranging the prairie many miles from the nearest timber — 

 perhaps traveling from one feeding ground to another. 



Table I. — Measurements of seventeen skulls of Erethizon porsatus car. dorsatus. 



* In the Museum of Comparative Zoology, Cambridge, Mass. 



t From front edge of tlie intermaxillaries to the occipital condyles. 



