FIELD BOOK OF MAMMALS 



Subfamily Vespertilioninae 

 Genus Myotis 



Dentition: Incisors, |; Canines, } ; Premolars, f ; Molars, | =38. 



Little Brown Bat. — Myotis lucifugus 



and related forms 



General Description. — ^A small, delicately- built Bat with 

 hairy face, narrow ear, slender tragus, rather ample mem- 

 branes, and long tail; pelage fairly long and soft; upper side of 

 interfemoral membrane sparsely haired on basal fourth. 



Color.— Adults colored alike; no very noticeable seasonal 

 variation. 



Upperparts dull brown, the fur slate-colored at base; mem- 

 branes brownish. 



Underparts a little paler and more yellowish than upper- 

 part .1. 



Measurements. — Total length, 3.6 inches; tail vertebrae, 

 1.6 inches; hind foot, .35 inch; length of forearm, 1.5 inches. 



Geographical Distribution. — Most of North America. 



Food. — Flying insects. 



Enemies. — Owls. 



Species and Subspecies of the Genus Myotis 



This is a difficult group and a brief written synopsis can not 

 take the layman far. Details of the skull, of the ear structure, 

 and the finer shades of color distinction can best be shown 

 by the actual comparison of specimens, and there is not space 

 in this field book to set these differences forth at length. The 

 genus has been revised b}^ G. S. Miller, Jr., and G. M. Allen, 

 and the forthcoming publication of their studies will supply 

 a needed guide to the student. 



Little Brown Bat. — Myotis lucifugus lucifugus (Le Conte). 

 As described above; ear about reaching nostril when laid 

 forward. Found in "The whole of North America north of 

 the southern boundary of the United States, except in the 

 Rocky Mountains and on the Pacific coast of California, 

 Oregon, Washington, British Columbia, and southern 

 Alaska." (Miller) Plate III. 



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