236 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. III. 



posterior margin; upper and lower molars much worn, the larger 

 one quite smooth, so that their characteristics are absent. 



Color. Cinnamon. 



Measurements. Skull: total length, 315: occipito- nasal length, 

 282; Hensel, 267; zygomatic width, 196; interorbital width, 75; 

 across postorbital processes, 103; mastoid width, 132; posterior 

 width of basioccipital, 39 ; length of pterygoid fossa, 49 ; palatal 

 length, 145; length of nasals, 75; anterior width of nasals, 30; width 

 at mid-length of nasals, 26; anterior edge of canine to posterior 

 edge of last molar, alveolar border, 99; length of last molar, crown, 

 24; width, 19; width of palate at anterior edge of last molar, 53; 

 between canines at posterior edge, 46; breadth of muzzle at outer 

 side of canines, 66; length of mandible, angle to symphysis on 

 top, 212; height at condyle, 36; at coronoid process from angle, 

 89; breadth of coronoid process above condyle, 62; length of condyle, 

 65; length of lower molar series, alveolar border, 58. 



Baird in Rep. U. S. and Mex. Bound. Surv., Mamm., 1859, p. 29, pi. 

 19, describes a brown bear from Copper Mines, New Mexico, as U. 

 cinnamomeus. Through the kindness of my friend Mr. G. S. Miller, 

 Jr., of the National Museum, I have the three skulls of Baird's speci- 

 mens, Nos. 991, 992, and 994, before me. They are smaller, narrower, 

 and generally lighter than the skulls of the Mexican bear, with the 

 superior outline like that of the skull of the eastern black bear. The 

 nasals are much narrower and less rounded at the posterior ends; 

 the width across postorbital processes much less, 94.74, to 103 in U. 

 machetes; the greatest zygomatic width is only 177.80, to 196, and the 

 width between orbits 64.17, to 77 in the new species; while the width 

 of the palate at the posterior margin of last molars is 48 to 55. It will 

 be seen by these measurements that the Mexican animal has a con- 

 siderably wider skull with broader nasals. The superior outline is 

 also more convex, and the forehead more prominent. The pterygoid 

 fossa is shaped very differently, being much broader for its entire 

 length, and nearly as wide at its anterior termination as between the 

 tips of the pterygoids. The mandible is very heavy, and the coronoid 

 process is very wide at its base, with a gradual inclination of its an- 

 terior outline backward to the rounded tip, with the posterior outline 

 slightly curved at top, and then nearly straight to the condyle, with- 

 out any hook, very different from the same process in U. cinnamomeus 

 with its tip rounded for its entire width, and prominent posterior 

 hook. The molar series are shorter, 50.5, to 68.58 of the New Mexi- 

 can species, and still shorter than that of U. americanus. 



Two skulls of U. machetes are in the collection of this institution, 



