68 



NORTH AMERICAN FAUNA. 



[No. 37. 



Color. — Fore part of back white or creamy white, sparingly tipped 

 with Vandyke brown, the bases of the hairs with a broad area of the 

 latter color; hinder back more extensively shaded with brown and 

 sometimes tinged with cinnamon-buff; head and face Vandyke 

 brown or blackish brown, often with a white patch in front 

 of eyes; sides of face and neck brownish, tinged with cinnamon 

 or buffy white; feet blackish brown, often mixed with cinnamon; 

 tail cinnamon-buff mixed with Vandyke brown, becoming (in some 

 specimens) dark chestnut-brown below; underparts mixed grayish 

 white and blackish brown in varying proportions, faintly tinged with 

 pale cmnamon-buff. 



Slcull. — Similar to that of oxytona, but relatively broader across 

 zygomata and interorbital region; decidedly larger than that of its 

 nearest neighbor, olcanagana, with broader postorbital constriction; 

 compared with nivaria it is shorter, mth the zygomata more widely 

 expanded and the premaxillae narrower. 



Measurements. — Adult male:^ Total length, 710-785 (average, 

 749); tail vertebrae, 205-252 (232); hind foot, 98-112 (102). Adult 

 female: 2 680-765 (714); 195-247 (219); 94-107 (99). SJcull: Adult 

 male: 3 Condylo-basal length, 106.2-107 (106.6); palatal length, 

 61.6-62.7 (62.2); postpalatal length, 39-40 (39.5); length of nasals, 

 42-44.5 (43.3); zygomatic breadth, 69.2-69.8 (69.5); breadth across 

 mastoids, 48.5-49.2 (48.9); least interorbital breadth, 27.1-29 (28); 

 breadth of rostrum, 24.5-24.7 (24.6); maxillary tooth row, 22.3-24.1 

 (23.2). Adult female:^ Condylo-basal length, 95.4-102.5 (98.8); 

 palatal length, 56.3-59 (57.7); postpalatal length, 34.6-39 (37.7); 

 length of nasals, 37.8-44 (41.7); zygomatic breadth, 64.2-68.4 (65.8); 

 breadth across mastoids, 44.9-49.4 (46.7); least interorbital breadth, 

 22.5-24.6 (23.8); breadth of rostrum, 19.3-22.7 (21.2); maxillary 

 tooth row, 21-23.2 (22.1). 



Remarlcs. — The Cascade hoary marmot differs from both olcanagana 

 and oxytona in whiter and browner (less black) coloration above ; from 

 nivarvi in much more dusky colors, both abov^e and below; and from 

 caligata in much larger size and darker coloration. It is widely dif- 

 ferent from olympus, both in color and cranial characters. It is appar- 

 ently isolated from aU the other forms of the group, and no absolute 

 intergrades have been examined, but the characters separating it 

 from the forms of caligata^ are so slight that it seems best to. regard it 

 as a subspecies of the latter. 



1 Four specimens from Mount Rainier and Cascade River, Wash. 

 3 Six specimens from same localities. 



8 Two specimens from Cascade River, Wash., and Mount Baker Range, British Columbia. 

 * Seven specimens from Cascade Range, Wash., and Mount Baker Range, British Columbia. 



