60 



NORTH AMERICAN FAUNA. 



[No. 37. 



specimens underfur between shoulders white to roots); top of head 

 and face blacky with a white patch in front of eyes often covering 

 the whole face; black of crown usually extending from ear back 

 over shoulders in the form of two divergent (more or less indistinct) 

 stripes; sides of face mixed brown and white (often nearly white); 

 fore legs white or buffy white, hind legs pale cinnamon-buff ; fore and 

 hind feet black or blackish brown; tail above, cinnamon-buff, tipped 

 with blackish brown or bay, the bases of the hairs extensively 

 dark chestnut-brown (or sometimes natal brown) ; beneath, blackish 

 brown or chestnut-brown, sometimes tinged with hazel or ochi^a- 

 ceous-tawny; underparts soiled whitish, sometimes mixed with black 

 or blackish brown. 



Slcull. — Relatively short and broad with short, broad rostrum; 

 zygomata broadly expanded posteriorly; nasals long, extending 

 beyond ends of premaxillae; postorbital constriction rather broad. 



Measurements, — ^Adult male:^ Total length, 710-715; tail verte- 

 brae, 210-218; hind foot, 91-105. Adult female:^ 675; 190; 95. 

 SluU: Adult male: 3 Condylo-basal length, 96.5-100.6 (average98. 7); 

 palatal length, 55.7-57.4 (56.4); postpalatal length, 36.5-38.2 (37.4); 

 length of nasals, 38.4-42.3 (40.7) ; zygomatic breadth, 64.5-68 (66.3); 

 breadth across mastoids, 44-46.2 (44.4); least interorbital breadth, 

 24.3-27.6 (25.8); breadth of rostrum, 23.7-26.1 (24.6); maxillary 

 tooth row, 22-23.8 (22.6). Adult female Condylo-basal length, 

 92.8-96.4 (94.2); palatal length, 53-54.8 (53.8); postpalatal length, 

 35-38 (36.3); length of nasals, 38-39.7 (38.8); zygomatic breadth, 

 61.6-64.1 (62.7); breadth across mastoids, 40-43.3 (41.9); least inter- 

 orbital breadth, 23-25 (23.9); breadth of rostrum, 22.1-24.5 (23.2); 

 maxillary tooth row, 20.6-22.5 (21.7). 



Remarks. — This race has an extensive distribution in Alaska and 

 Yukon and shows little variation over its whole range. In the 

 southern part it is confined to the region near the coast but in the 

 north it occupies the interior mountain ranges as far east as the 

 main Rocky Mountains in northwestern Mackenzie. In specimens 

 from the Kenai Peninsula the nasals average somewhat shorter than 

 in typical specimens, rarely extending back of the posterior ends of 

 the premaxiUae, but the skulls show no other differences. Speci- 

 mens from the southern coast of Alaska as far south as the Portland 

 Canal (with the exception of the vigilis series from Glacier Bay) are 

 typical, but intergradation with oxyto7ia occurs a short distance from 

 the coast in northern British Columbia, the series from Cheonee 

 Mountains being distinctly intermediate in character. The form 

 occupying the northern Rockies in eastern Yukon and western 



1 Two specimens from head of Coal Creek, Yukon. 



2 One specimen from same locality. 



3 Five specimens from Becharof Lake, Alaska. 



* Seven specimens: 6 from Alaska Peninsula, 1 from Coal Creek, Yukon. 



