I 40 Bulletin American Museum of Natural History. [Vol. XIX, 



Post-breeding pelage. Type. Front and top of head deep rufous, 

 varied minutely on the crown with black- tipped hairs; restf of the 

 dorsal area yellowish brown, thickly covered with small squarish spots 

 of white, narrowly edged posteriorly with black; sides and ventral 

 surface ochraceous, wholly concealing the plumbeous underfur; back 

 and sides with many long, stiff, wholly black hairs; front and sides of 

 the nose, chin, and upper throat deep buff; upper surface of both fore 

 and hind feet rusty buff; upper surface of tail blackish, especially 

 towards the tip, conspicuously fringed with deep fulvous, the hairs 

 individually being grayish fulvous, then narrowly ringed with black, 

 then with a broader ring of deep fulvous, followed by a broad band of 

 tlack and a broad fulvous tip; lower surface of tail deep orange 

 rufous, with a subapical black band, reaching nearly to the base of the 

 hairs, and edged and tipped with fulvous. 



'In breeding dress (left-over winter coat) the pelage is thin and worn, 

 and the general coloration is much paler, through fading and wear, so 

 that in many specimens the sides of the neck and shoulders are gray> 

 almost without trace of fulvous; the sides are pale fulvous gray, the 

 deep orange or ochraceous tint of the ventral surface is much paler, 

 and the fulvous fringe of the tail has bleached to yellowish white. 



Young of the year, one eighth to one half or two thirds grown, re- 

 semble in a general way the faded breeding adults, but the pelage is 

 softer and more woolly, and the markings and tints are less developed ; 

 the crown patch is paler and mixed more or less with gray, the scapular 

 region is pale, and the dorsal region grayish brown varied with black, 

 with the spotting poorly denned. 



Ten adult males and ten adult females measure as follows: Males, 

 total length, 356.8 (340-380) mm.; tail vertebrae, 90.9 (80-104); hind 

 loot 59.2(57-62); Females, total length, 358.7 (345-374); tail verte- 

 T>rae, 90.3 (80-101); hind foot, 58.5 (56-60). 



This species is represented by 48 skins and skulls, 3 speci- 

 mens in alcohol, and 10 additional skulls, taken at Gichiga by 

 Mr. Buxton at various dates from May 21 to October 5, 

 and 7 specimens obtained at Indian Point (Chaplin Point of 

 most maps), by Mr. Bogoras, in June, including two pure 

 white albinos, purchased of the natives. 



In post-breeding pelage the coloration varies considerably 

 in different specimens. The description given above of the 

 type indicates about the average condition, from which the 

 coloration varies chiefly in the depth of the ochraceous color 

 of the sides and ventral surface, which ranges in different 

 specimens from orange to pale ochraceous, with a correspond- 

 ing variation in the amount of fulvous suffusing the dorsal 



