AMERICAN BATS OF THE GENERA MYOTIS AND PIZONYX 131 



though not always keeled calcar, and by the pinkish-gray color and 

 loose texture of the fur. Forearm 36 to 40.6 mm. (usually 38 to 39 

 mm.). Skull with a narrower brain case and more pronounced sag- 

 ittal crest than in Myotis lucifugus. 



Ears. — The ear is about as in Myotis lucifugus., of medium size, its 

 lower anterior border convex, then nearly straight in its upper half, 

 with a broadly rounded summit, below which the outer margin is 



Map 9. — Distribution of Myotis sodalis 



very slightly concave, then passes gradually into the basal shoulder 

 without forming a notch or abrupt transition. Laid forward the 

 ear reaches to the tip of the nostril. Tragus rather short and blunt, 

 curving slightly forward, its total height a little less than half the 

 tdtal height of the ear from outer corner to tip (about as 6 : 14 mm.). 

 The posterior edge is shghtly crenulat*. 



^Ying and nnemhranes. — Wing from the side of the foot, beginning 

 just below the base of the outer toe at the head of the metatarsal. 

 The metacarpals are regularly graduated, the third longest, the 

 fourth and fifth successively a trifle shorter. The lengths of the 

 fingers are similarly graduated. Taking the third finger as 100, the 

 fourth and fifth are respectively as 73 and 67 (69.5:50.5:46.5 mm.), 



