GAPPER'S RED-BACKED MOUSE 



229 



brown above and grayish underneath. The species most 

 common in the eastern United States, often called Gapper's 

 Field Mouse, is found westward to the Rockv Mountains. 

 It is 3% inches in length of head and body; tail, 1% inches. 



CAPPER'S RED-BACKED MOUSE. 



In scientific lists of the mammals of North America, Red- 

 backed Mice are sometimes called Red-Backed 'Voles." 



The Voles of the genus Phe-nac'o-rnys, are small brown 

 mice, mostly of recent discovery, about the size of the red- 

 backed mouse, in color usually dark brown mixed with black. 

 Nine species are known, extending in range from Labrador 

 westward to Oregon, Washington, and northern British Co- 

 lumbia, and also down to Colorado. None are found in the 

 eastern half of the United States. There is no special mark 



