DECEMBER, 1903. MAMMALS ELLIOT. 257 



FAM. 



URSUS. 

 Ursus *hylodromus. Sp. nov. 



Type locality: Alberta, Northwest Territory. 



Genl. char.: Skull: forehead prominent; elevated above face, 

 highest part of brain-case slightly anterior to a line from the roots of 

 the zygomata; frontals broad at post-orbital processes; outline of nasals 

 concave, the posterior portion curving upwards on to the frontals, 

 similar to the nasals of U. altifrontalis and U. machetes, but in a less 

 degree ; brain-case bulging on sides to a greater extent than that of 

 either of the species named; zygomatic arches only moderately 

 expanded ; narial opening very large, wide and evenly rounded infe- 

 riorly; occipital crest prominent; bullae wider than long, the tubular 

 meatus much elongated and narrow; pterygoid fossa broad, narrowest 

 anteriorly at palatal arch, the processes rather short, broad, and their 

 tips turned inwards; palate of nearly equal width for the entire length 

 between the tooth rows, contracting after last molar gradually to the 

 pterygoids; basioccipital flat and very broad, sides low; mandible 

 very heavy ; upper outline of coronoid process curving downward pos- 

 teriorly and forming a hook. 



Measurements: Total length, 312; occipito-nasal length, 257; 

 Hensel, 270; zygomatic width, 173; width at post-orbital processes, 

 96; width between orbits, 69; greatest breadth of brain-case, 102; 

 length of nasals, 76; width anteriorly, 30; width posteriorly, 12; 

 greatest width of narial opening, 50; height of narial opening, 41; 

 width of basioccipital, 47; of basisphenoid, 36; length of pterygoid 

 fossa, 46; anterior width, 16; median width, 25; posterior width at 

 pterygoid processes, 24; palatal length, 153; width between last 

 molars, 45 ; between canines at posterior edge, 45 ; between outer 

 edges at palatal arch, 36; length of three upper molars, alveolar border, 

 67; length of mandible, 217; depth of mandible at middle of second 

 molar, 37.5; height at coronoid process, 88; width of coronoid process 

 above condyle, 57; breadth of coronoid process beneath hook, 41; 

 breadth at hook, 40 ; length of three lower molars, alveolar border, 65. 

 No skin preserved. 



This black bear is nearest allied to the Ursus altifrontalis from 

 the Olympic Mountains, and the skulls have a general resemblance, 

 with the characters of the present form much less accentuated. It 



* blo-dpofjiuo wood-ranging. 



