Merriam — Nineteen New Bears from Western America. 135 



Old male apache (the type) compared with adult male arizonae (the 

 type): Basal length, occipito-nasal length, length of palate, interorbital 

 breadth, and occipito-sphenoid length essentially same; zygomata very 

 much more outstanding and bowed instead of subtriangiilar ; frontal 

 shield less flat, of essentially same breadth as in arizonae interorbitally 

 but very much wider across postorbital processes rising strongly from 

 plane of rostrum ; postorbital processes much more broadly outstanding; 

 orbital rims more swollen ; fronto-nasal region much less elevated ; ros- 

 trum much smaller, narrower, less swollen, depressed basally, and hori- 

 zontal instead of tapering ; palate and postpalatal shelf much narrower. 

 Lower jaw stronger ; ramus broader vertically ; coronoid blade higher ; 

 molars slightly smaller; heel of M' shorter, less distinctly emarginate on 

 outer side (more tapering). 



Skull measurements (d* ad. type). — Basal length 325 mm.; occipito- 

 nasal length 315; palatal length 171.5; zygomatic breadth 234; interor- 

 bital breadth 89. 



Ursus arizonae sp. nov. 



Type No. 177332 c? adult, east side EscudillaMts., Apache Co., Arizona, 

 September 3, 1911. C. H. Shinn. 



Cranial characters. — Skull of adult male (the type): Size rather large; 

 skull as a whole rather long and narrow, with broad rostrum ; vault of 

 cranium moderately elevated but not arched, highest about two-thirds 

 distance from plane of postorbitals to fronto-parietal suture; frontal 

 shield rather narrow, nearly fiat, gently sloping in plane of rostrum, the 

 posterior point in type specimen reaching to about 25 mm. in front 

 of parietals [in older specimens shorter] ; postorbitals broad and broadly 

 rounded, nearly horizontal but not widely projecting ; fronto-nasal region 

 and rostrum elevated and swollen, continuing plane of frontal shield 

 without trace of dishing, tapering anteriorly; zygomata not widely out- 

 standing, bowed anterior roots swollen ; palate rather short and broad ; 

 postpalatal shelf broad ; meatus tube long ; coronoid blade rather broad 

 above, its recurved apex cutting plane of condyles. Teeth rather small 

 for size of skull; canines of good size; molars rather small for size of 

 skull, especially last upper molar. 



Cranial comparisons. — Adult male arizonae (the type) compared unth 

 old male apache (the type): Basilar length, occipito-nasal length, length 

 of palate, interorbital breadth, and occipito-sphenoid length essentially 

 same ; zygomata very much less outstanding and subtriangular instead 

 of bowed ; frontal shield flatter, of essentially same breadth interorbitally, 

 but very much narrower across postorbital processes ; postorbital processes 

 much less broadly outstanding ; orbital rims less swollen ; fronto-nasal 

 region much more elevated and swollen ; rostrum much larger, broader, 

 more swollen and tapering, instead of depressed basally, narrow and 

 horizontal; palate and postpalatal shelf much broader. Lower jaw 

 weaker ; ramus less broad vertically ; coronoid blade less high ; molars 

 slightly larger; heel of M' longer, more distinctly emarginate on outer 

 side (less tapering). 



