AMERICAN BATS OF THE GENERA MYOTIS AND PIZONYX 135 



Cranial measurements of Myotis sodalis 



Type. 



MYOTIS VOLANS (H. Allen) 



(Synonymy under subspecies) 



Distinhution. — ^Western North America from southwestern Alaska 

 (Admiralty Island) to the tip of the Lower Calif ornian peninsula 

 and southern Mexico (Vera Cruz), thence eastward into the wooded 

 parts of Arizona, New Mexico and Colorado, Nevada, Idaho, and 

 Wyoming. Apparently forest-loving, preferring high open woods. 



Diagnosis. — Small or medium-sized bats, the forearm 35 to 41 mm. ; 

 total length about 83 to 95 mm., tail usually 42 to 46 mm., the ratio 

 of its length to head and body averaging 92.4 in 10 specimens from 

 Nicasio, Calif., and 94.1 in 10 specimens from interior localities. 

 Skull with short rostrum, high forehead, and convex temporal ridges, 



