FIELD BOOK OF MAMMALS 



coast region of the United States, from Delaware Bay to 

 Pamlico Sound; inland to Washington, Virginia, and 

 Raleigh, N. C." (Hollister) 



Labrador Muskrat. — Ondatra zihethica aquilonia (Bangs). 

 Much like typical zihethica, but slightly brighter and more 

 richly colored. Found in "Labrador and Ungava. " 

 (HolHster) 



Hudson Bay Muskrat. — Ondatra zihethica alba (Sabine). 



Smaller than typical zihethica; total length, 21.6 inches; 

 hind foot, 3 inches; paler in color above. Found in "Waters 

 draining into Hudson Bay from the west, in eastern Saskat- 

 chewan and Keewatin; north to the Barren Grounds." 

 (Hollister) 



Northwestern Muskrat. — Ondatra zihethica spatulata (Osgood). 

 Small and dark. Total length, 21.2 inches; hind foot, 

 3 inches. Color above, glossy brown, sides russet, under- 

 parts whitish washed with cinnamon. Found in "North- 

 western North America, from the Kowak River and Yukon 

 Valley, Alaska, east to the Anderson River and south into 

 British Columbia and Alberta." (Hollister) 



Alaska Peninsula Muskrat. — Ondatra zihethica zalopha 

 (Hollister). 

 Small, with short tail and small hind foot. Total length, 

 21.3 inches; tail vertebrse, 9.1 inches; hind foot, 2.8 inches. 

 Color bister. Found in "Alaska Peninsula, north to 

 Nushagak and east to the head of Cook Inlet." (Hollister) 



Rocky Mountain Muskrat. — Ondatra zihethica osoyoosensis 

 (Lord). 

 Like spatulata but larger; total length, 23.6 inches; hind 

 foot, 3.3 inches. Color dark brown to blackish above. 

 Found in "Puget Sound region and Rocky Mountains, 

 from southern British Columbia, Washington, Idaho and 

 western Montana, south in the mountains to northern 

 New Mexico." (Hollister) 



Oregon Coast Muskrat. — Ondatra zihethica occipitalis (Elliot) . 

 Resembling osoyoosensis but paler and redder. Total 

 length, 23.6 inches; tail vertebrae, 10.8 inches; hind foot, 

 3.3 inches. Found in "Northern Willamette Valley and 

 coast of Oregon." (Hollister) 



Nevada Muskrat. — Ondatra zihethica mergens (Hollister) . 

 Large and pale. Total length, 22 inches; tail vertebrae, 

 10. 1 inches; hind foot, 3.2 inches. Color above, grayish 

 brown. Found in "Northern part of the Great Basin; 

 southeastern Oregon, northeastern California, Nevada, and 

 western Utah." (Hollister). 



Arizona Muskrat. — Ondatra zihethica pallida (Meams). 



Small, rusty red, no long black hairs on back. Total 

 length, 17.2 inches; tail vertebras, 7.6 inches; hind foot, 2.6 

 inches. Found in "Colorado River valley (California, 

 Lower California, and Arizona), east to the Rio Grande 

 Valley in New Mexico." (Hollister). 



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