Merriam — Nineteen New Bears from Western America. 137 



equally old male pervagor from Bridge River (No. 4 Provincial Museum, 

 Victoria, B. C. ) as will be seen from the following : Basal length 20 mm. less ; 

 occipito-nasal length slightly greater ; zygomatic breadth less; facial part 

 strongly deflected [in pervagor not deflected] ; palate arched [in pervagor 

 not arched]; frontal shield shallowly sulcate medially [in old pervagor 

 broadly concave] ; postorbitals broad, fiat, horizontally outstanding [in 

 pervagor long, peglike, uphfted and arched] ; braincaseand sagittal crest 

 arched [in pervagro?- straight and nearly horizontal]; occipital overhang 

 much greater; zygomata less widely outbowed. 



Old male (the type) compared with old male selkirki (the type, No. 

 205170) from upper Columbia River, Selkirk Mts., B. C. : Size larger 

 (basal length only slightly greater but occipito-sphenoid and occipito- 

 nasal lengths much greater, and skull as a whole distinctly larger) ; vault 

 of cranium decidedly more highly arched; facial angle more strongly 

 deflected from basi-cranial axis; zygomata much more widely spreading 

 and outbowed, and much more arched; frontal shield rising less abruptly 

 from rostrum, more evenly sloping, rising higher posteriorly, and much 

 shorter-pointed; braincase and sagittal crest much longer, the crest 

 higher and convex or arcuate anteriorly ; occipital overhang greater ; 

 palate more strongly arched (anteroposteriorly) ; mastoids longer and 

 strongly spreading. Lower jaw longer and more massive, more swollen 

 on outer side below middle and posterior molars ; its inferior border more 

 bellied posteriorly; coronoid blade very much higher. 



Old male (the type) compared with old male washake (the type): Size 

 slightly larger (basal length essentially same but upper part of skull 

 much longer); vault of cranium more highly arched; frontal shield con- 

 tinuing to rise posteriorly (instead of flattened) and much shorter- 

 pointed ; rostrum decidedly broader ; postorbital processes not elevated ; 

 lachrymal duct within orbit (not cutting rim as seen from in front); 

 braincase compressed and keeled anteriorly (in washake depressed); 

 sagittal crest much longer and convex instead of straight ; squamosal 

 arm of zygoma longer and more broadly expanded vertically ; palate 

 concave and arched anteroposteriorly, instead of flat ; postpalatal shelf 

 longer and less broadly flattened; occipito-sphenoid longer; mastoids 

 longer and more spreading. Molars smaller. 



Skull measurements ( c? old, type). — Basal length 314 mm.; occipito- 

 nasal length 323 ; palatal length 170 ; zygomatic breadth 225 ; interorbital 

 breadth 86. 



Ursus cressonus sp. nov. 



Type No. 206529 d* old, U. S. National Museum, Biological Survey 

 Collection. Type from Lakina River, south slope of Wrangell Range, 

 Alaska. Collected by Captain J. P. Hubrick of McCarthy, Alaska, 

 1914. 



Range. — Chitina River Valley and adjacent slopes of Skolai and Wran- 

 gell Mountains, westerly doubtless through Chugach Mountains to the 

 west side of Cook Inlet, where it occurs as far south as the Iliamna 

 region. 



