102 



BULLETIN 144, UNITED STATES NATIONAL MUSEUM 



I 



straight, its outer edge with a small rounded basal lobe, succeeded by 

 a shallow notch, above which it is nearly straight to the acute tip. 

 Wing and rtiemhraiies. — ^Wing membranes from the base of the 

 toes. Metacarpals 3, 4, and 5 practically equal in length (in an ab- 

 normal individual nic 4 of the right side is 2 mm. shorter than 3 

 and 5). When folded, the third metacarpal falls 2 mm. short of 

 the elbow. Fourth and fifth fingers of nearly equal length; taking 

 the third finger as 100, the fourth is 84, and the fifth is 82 (61: 

 52:51 mm.). The edge of the uropatagium is essentially bare, 

 though with the aid of a lens, a few short hairs may sometimes be 



Map 6. — Distribution of Myotis kebnii : 1, M. keenii kebnh ; 2, M. kebnii 



SEPTKNTRIONALIS 



seen at irregular intervals, along its border, occurring singly, and 

 never forming a fringe. Terminal caudal vertebra and most of the 

 penultimate vertebra free from membrane. 



Foot.—T\iQ foot is usually a little more than half the length of the 

 tibia; in 6 specimens from the Pacific coast the ratio of foot to 

 tibia averages 51.2; in 10 from the northeastern part of the animal's 

 range it averages 50.4; and in a series containing the same number 

 from Illinois, Indiana, Wisconsin, Tennessee, and Missouri it aver- 

 ages 50.5; in exceptional individuals it falls as low as 45.2. Calcar 

 long, slightly thickened at the base, terminating in a small lobule 

 situated about one-half the distance from the foot to the tip of tail. 



