224 The Mammals of Colorado 
There is a very marked difference between the skulls of the 
Grizzly and Black Bears, in fact the two species are placed in two 
FIG. 71. GRIZZLY BEAR, Ursiis liorribUis 
Side view of skull x \ 
different subgenera, the former belonging to the subgenus Danis, and 
the latter to Euarctos. 
The skull of the Grizzly is massive, and of course much the larger, 
FIG. 72. BLACK BEAR, Uvsiis amertcanus 
Side view of skull x I. Note difference between profiles of grizzly 
and black bears 
and presents a more angular, less rounded appearance; the tem- 
poral ridges or impressions meet anterior to the posterior end of 
