Preliminary Synopsis of American Bears. 75 



narrowed on the outer side immediately in front of the posterior 

 cusp. Except in a single skull (an old male from the Shaktolik 

 River, No. 76470), the combined length of the basioccipital and 

 basisphenoid along the median line is decidedly less than half 

 the length of the palate. In the Rocky Mountain Grizzly the 

 occipito-sphenoid length is decidedly greater than half the length 

 of the palate. 



Ursus horribilis horriaeus Baird. Sonora Grizzly. 

 PI. IV, fig. 5; pi. V, fig. 6; pi. VI, fig. 4. 



Ursus horribilis var. horriaeus Baird, Rept. Mexican Boundary Survey, II, 

 Mammals, pp. 24-29, 1859. 



Type locality. Coppermines, southwestern New Mexico. 



Geographic distribution. Southern Rocky Mountains and outlying 

 peaks and ranges in Colorado, New Mexico, Arizona (and probably south 

 ern Utah), northern Mexico, and southern California. The type locality 

 is the old Coppermines, near the Rio 

 Miinbres, in Grant Co., New Mex. 



FIG. ii. Sonora Grizzly from the Copper- FIG. 12 -Rocky Mountain Grizzly from 



mines, New Mexico. Baird's type. Wyoming. 



Characters. Size large; skull and teeth large and massive; frontal 

 region not elevated above or behind orbits, highest at, and flattened and 

 concave between, postorbital processes; temporal impressions straight/or 

 nearly straight, meeting considerably anterior to hinder end of frontals, 

 and elevated anteriorly to form well-defined ridges or crests (PI. 6, fig. 4). 



Remarks. Professor Baird in his original description of hor 

 riaeus had three specimens an adult skin and skull from 

 Nogales, Sonora, and both adult and young skulls from the Cop 

 permines, New Mexico. The adult from the latter locality (No. 

 990) is here chosen as the type because it is the one used by 

 Baird in his comparisons, and the only one of which he gave a 



