MAMMALS 343 



Subspecies of M . caligata 



M. c. mvaria How. High mountains of northwestern Montana and 

 northern Idaho. 



M. c. cascadensis How. Head and feet browner and under parts 

 darker: Cascade Range, Washington; southward to Mount Rainier. 



M. c. olympus (Merr.). Color brownish drab; feet brown: upper 

 slopes of Olympic Mountains. 



Subfamily 2. Pteromyinae. — Flying squirrels: i genus. 



Glaucomys Ralinescjue. Flying squirrels. Small rodents with 

 a broad furry membrane stretching between the front and hind legs and 

 extending out from the sides; tail flattened; ears large; dentition i/i, 

 0/0, 2/1, T,/2,'. about 15 species; in the northern hemisphere; 2 species 

 and many subspecies in the United States, nocturnal animals which 

 make their nests in holes in trees; from 2 to 6 young form a litter, of 

 which there probably are several a year. 



Key to the Species of Glaucomys 



ai Belly pure white G. volens. 



a2 Belly dirty white G. sabrimis. 



G. volans (L.). Color drab above ringed with reddish; beneath 

 creamy white; underside of flying membrane pinkish; length 230 mm.; 

 tail 100 mm.; hind foot 30 mm.; fur soft and dense: eastern and central 

 States from southern Maine to Florida; westward to the plains. 



Subspecies oJ'G. volans 



G. V. volens (L.). Eastern and central States from Maine to North 

 Carolina; west to Kansas and Nebraska. 



G. V. saturatus Howell. Darker in color: from North Carolina and 

 Tennessee to the Gulf coast of Alabama to Lousiana. 



G. V. texensis How. Color yellowish: eastern Texas. 



G. V. qiierceti Bangs. Color more uniform russet: coastal region, 

 Georgia and Florida. 



G. sabrinus (Shaw). Color drab above and dirty white beneath; 

 length 312 mm.; tail 137 mm.; hind foot 42 mm.: northeastern and 

 central States and Canada; southward into Massachusetts and northern 

 New York; north to Alaska and Hudson Bay; Pacific Slope. 



Subspecies of G. sabrinus 



G. s. sabrinus (Shaw). Extreme northwestern Wisconsin; Canada, 

 north to Hudson Bay. 



