MEADOW MICE 



131 



been carried down-stream from some Canadian Zone location on the slopes 

 above. Altitudinaliy, this mouse was recorded as high as 10,700 feet in 

 the head of Lyell Caiion, close to timber line. The lower limit of its regular 

 range on the west slope is between 5000 and 6000 feet. 



Fig. 20. (a) Sierra Cantankerous Meadow Mouse; Yosemite Valley, December 29, 

 1914. See p. 129. (b) Yosemite Meadow Mouse; same data. See p. 122. (c) Mountain 

 Lemming Mouse; Ten Lakes, October 8, 1915. See p. 133. 



All photographed from freshly trapped specimens, about % natural size. 



The Cantankerous Meadow Mouse does not regularly construct run- 

 ways as do the California and Yosemite meadow mice. As a rule, it merely 

 runs about here and there on the surface of the ground. In a few places, 

 however, notably at Glen Aulin and Vogelsang Lake, we did notice ill- 

 defined pathways on the ground beneath the thickets of bilberry and 

 Labrador tea bordering the streams ; and along these Cantankerous Meadow 

 Mice were caught. Extensive use of the paths was indicated by the 



