142 Proceedings of the Biological Society of Washington. 



Cranial characters. — Skull of adult male : Size medium, rather long, 

 narrow, somewhat arched and dished, with long braincase, long convex 

 sagittal crest, and unusually broad decurved postorbitals. Frontal shield 

 of medium width, strongly convex both transversely and anteropos- 

 teriorly, rising rather strongly from rostrum, slightly sulcate medially 

 and moderately swollen over orbits; very short-pointed, the point ending 

 about midway between parietals and plane of postorbitals ; postorbitals 

 remarkably broad, decurved, strongly convex anteriorly, concave posteri- 

 orly ; fronto-nasal region somewhat depressed ; rostrum high and narrow, 

 rounded above (subterete); nares truncate; sagittal crest very long and 

 arcuate; occipital overhang and inion well developed; zygomata not 

 widely outstanding, somewhat bowed, rounded posteriorly; palate mod- 

 erate, postpalatal shelf large and broad; notch rather broad and short; 

 mastoids long and divergent; underjaw rather long; coronoid blade high 

 and narrow, the apex rather strongly recurved; teeth too badly worn to 

 admit of description (apparently large for size of skull). 



Skull of adult female: Size small, nearly as small as female pallasi ; 

 fronto-nasal region moderately dished and usually sulcate; braincase 

 moderately arched, highest just in front of fronto-parietal suture; tem- 

 poral impressions meeting over anterior part of parietals (probably some- 

 what more anteriorly in old skulls); zygomata moderately outbowed, 

 subtriangular ; frontal shield of medium breadth, lyrate-pointed pos- 

 teriorly ; postorbital processes rather broad for so small a skull, moderately 

 decurved; underjaw short; coronoid blade broad basal ly and rather 

 short. Teeth (canines, incisors and molars) rather large for size of skull, 

 decidedly larger than in pallasi; molars, both upper and lower, very 

 much larger. 



Cranial comparisons. — The only species requiring comparison with 

 kluane are toklat, latifrons and pallasi. Old male (the type) compared 

 with old male toklat from Alaska Range, near north base of Mt. McKinley : 

 Size slightly larger; occipito-nasal length, length of braincase, and length 

 of sagittal crest very much greater ; frontal shield more convex trans- 

 versely ; postorbital processes much larger and broader ; rostrum higher, 

 more rounded on top; nares more squarely truncate; underjaw longer; 

 inferior border of ramus more convex posteriorly ; coronoid blade decid- 

 edly higher, narrower above, the apex more strongly recurved; teeth 

 badly worn in both ; but canines decidedly longer in kluane; molars ap- 

 parently somewhat larger. 



Adult female kluane compared with adult female toklat (comparison 

 hardly necessary because of the great difference in size) : Basal length at 

 least 20 mm. less; vault of cranium and frontal shield lower; braincase 

 less constricted anteriorly; posterior part of shield much longer and 

 broader, reaching or passing the fronto-parietal suture; sagittal crest 

 much shorter; postpalatal shelf less broad; lower jaw and inferior border 

 of ramus shorter ; coronoid blade about same height ; canines about same 

 size; molariform series (upper and lower) about same length but propor- 

 tions of individual teeth differ: M' much larger; M* with shorter heel; 

 Ml larger. 



