Point Arena mountain beaver, Aplodontia rufa nigra (Taylor) 
Type Locality. Point Arena, Mendocino County, Calif, 
Range. Known only from type locality, where it is found within 
an area of approximately 24 square miles. 
Point Reyes mountain beaver, Aplodontia rufa phaea (Merriam) 
Type Locality. Point Reyes (probably somewhere near present town 
of Inverness), Marin County, Calif. 
Range. Humid coast belt of Marin County, from 5 miles west of 
Inverness east to Langunitas and south to four miles south of 
Olema; area inhabited, approximately 110 square miles; vertical 
range below 1,000 feet; zonal range, Transition, Grinnell (1933). 
Sierra Nevada mountain beaver, Aplodontia rufa californica (Peters) 
e Locality. Assumed to be the Sierra Nevada of California. 
Grinnell (1913); specimens from Blue Canyon, Placer County, in 
central Sierra Nevada may be regarded as typical, Taylor (1918) 
and Hall (1941). 
Range. Sierra Nevada, north to Mount Shasta and south as far as 
Clover Creek, Sequoia National Park, Tulare County; vertical range, 
from 4,600 feet (Blue Canyon, Placer County); zonal range, Canadian 
and Hudsonian, Grinnell (1933). Recorded also eastward to Washoe 
and Ormsby Counties, Nevada. Hall (1946). 
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