140 Proceedings of the Biological Society of Washington. 



various points on Alaska Peninsula: Size about the same; vault of 

 cranium more highly arched; frontal shield narrower, more strongly 

 convex in cross section, less deeply sulcate ; postpalatal processes more 

 slender, peglike and outstanding; frontal-nasal region more dished; 

 rostrum more slender; nasals more completely wedge-shape, longer 

 posteriorly, reaching posteriorly to plane of postpalatal processes; mas- 

 toids longer and more divergent. 



Adult female (No. 205176) from head of Knik Arm, compared with adult 

 female Hdderi: Size materially smaller; frontal shield and rostrum much 

 narrower ; vault of cranium notably higher over fronto-parietal suture ; 

 braincase narrower; nasals longer posteriorly; lower jaw smaller and 

 lighter. 



Male adult eximius (the type) compared with male adult alascensis (No. 

 76466) /row Unalaklik River, Norton Sound, Alaska: Skull much longer, 

 more highly arched, and narrower throughout. Frontal shield much more 

 elevated, narrower, and longer posteriorly; fronto-nasal region more 

 strongly dished; rostrum narrower and higher; lambdoid crest much 

 more strongly developed; palate and post-palatal shelf much longer; 

 occipito-sphenoid much longer; mastoids much longer and strongly 

 divergent; lower jaw longer; coronoid blade much higher; teeth larger; 

 heel of M^ much longer. 



Adult female eximius compared with female alascensis: Length essentially 

 same; skull narrower throughout; frontal shield lower, much narrower 

 and flatter, rising less abruptly from rostrum; fronto-nasal region sulcate 

 but less strongly dished ; rostrum slightly more slender ; postpalatal shelf 

 narrower. Underjaw about same length ; inferior border of ramus more 

 evenly convex (less abruptly bellied); coronoid blade broader; canines 

 about same size; molars somewhat larger. 



Skull measurements ( (5^ ad. type). — Basal length 331 mm.; occipito- 

 nasal length 319 ; palatal length 185 ; zygomatic breadth 215 ; interorbital 

 breadth 71 . 



Ursus hoots * sp. nov. 



Type No. 206136 c7 adult, U. S. National Museum, Biological Survey 

 Collection. From Clearwater Creek, a north branch of Stikine Eiver, 

 B. C. , 1913. Collected by John Hyland ; presented by Lincoln Ella- 

 worth. 



Cranial characters. — Size medium inclining to large; skull massive, 

 slightly dished, rather short, low, and flattish, very broad across frontals 

 and rostrum. Frontal shield broad, nearly flat, long-pointed; broadly 

 and shallowly sulcate medially as far back as posterior plane of post- 

 orbitals; postorbitals large, broad, and horizontally outstanding; fronto- 

 nasal region sloping; rostrum broad; palate and postpalatal shelf broad; 

 postpalatal notch moderate ; sagittal crest short, ending at fronto-parietal 

 suture; zygomata moderately outbowed, not broadly spreading; lower 

 jaw rather massive; inferior border of ramus upcurved posteriorly ; coro- 



• Hoots, the native Indian name for the big brown and grizzly bears. 



