FIELD BOOK OF MAMMALS 



black, usually arranged in broad dorsal band; top of head 

 black; face grayish; underparts grayish, lightly washed with 

 brown. Total length, 13 inches; hind foot, 2.1 inches. 

 Found on "Coast of Oregon, from Astoria on the north at 

 least to Port Orford on the south; ranging inland locally, 

 as in the vicinity of Eugene, Oregon, and gradually inter- 

 grading with Aplodontia rufa rufa probably in a broad belt 

 centrally on the Pacific slope of Oregon from the northern 

 to the southern boundaries of the state." (Taylor) 



Humboldt Mountain Beaver. — Aplodontia rufa humholdtiana 

 (Taylor). 

 "Larger and less richly colored than Aplodontia rufa paci- 

 jicay (Taylor) Upperparts light ochraceous buff to pink- 

 ish buff, uniformly sprinkled with black hairs and some 

 silver- tipped hairs; underparts pale drab sprinkled with 

 silvery white hairs, sometimes faintly washed with buffy 

 brown; usually a white spot on lower abdomen. Total 

 length, 13.8 inches; hind foot, 2.2 inches. Found in "The 

 northern coast district of California from Humboldt Bay, • 

 Carlotta, and Cuddeback along the coast in Humboldt and 

 Del Norte counties northward, at least to Requa; ranging 

 inland locally in Humboldt County and intergrading with 

 A. r. rufa in the vicinity of Weitzpek." (Taylor) 



Sierra Mountain Beaver. — Aplodontia rufa calif ornica 

 (Peters). 

 Grayer than typical rufa. Upperparts pale ochraceous 

 buff to ochraceous buff; uniformly sprinkled with black 

 hairs and a few silvery-tipped hairs; spot at base of ear 

 white; underparts light mouse-gray, lightly sprinkled with 

 black hairs which may be tipped with silvery white, some- 

 times with faint brownish wash. Total length, 14 inches; 

 hind foot, 2.2 inches. Found in "The Sierra Nevada of 

 California, from Mt. vShasta on the north at least to Mam- 

 moth, Mono County, on the south. Zonal range, Boreal." 

 (Taylor) 



Point Arena Mountain Beaver. — Aplodontia rufa nigra 

 (Taylor). 

 The darkest form of the genus. Upperparts shiny black, 

 faintly sprinkled with pinkish buff hairs; sides paler than 

 back, pinkish buff overlaid with black; underparts slate- 

 colored, with light wash of pinkish buff. Total length, 

 13.8 inches; hind foot, 2.2 inches. Found only at Point 

 Arena, Mendocino County, California." (Taylor) 



Point Reyes Mountain Beaver. — Aplodontia rufa phcea (Mer- 

 riam). 

 The smallest form of the genus. Upperparts pinkish cin- 

 namon to cinnamon-buff (in winter sometimes grayish), 

 uniformly grizzled with blackish; underparts slate-colored, 

 with scattered sprinkling of black hairs, and washed with 

 light ochraceous-buff to pinkish buff. Total length, 12.4 

 inches; hind foot, 2.1 inches. Found in "Favorable situa- 



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