620 



REPORT OF STATE GEOLOGIST. 



glandular protuberances of the muzzle of this species are wholly 

 unknown. A careful study of its habits and sensory adaptations, as 

 well as the development and minute structure of these organs, 

 should be well worth while. 



Genus Myotis Kaup. 



Myotis Kaup, Skizzirte Entw.-gesch. u. Natiirl. Syst. d. Europ. 

 Thierw., I, p. 106, 1829. 



Dental formula.— 1, fEf; C, ^J; Pm, |Ef; M, = 38. 

 Generic characters. — Size small; ears and tragi (fig. 28, a, b, c) 

 slender and pointed ; the latter generally straight. The only char- 



PiG. 28. — Kavs of bats: a, Myotis lucifugus (x 2) ; b, Myotis suhulatus (x2) ; 

 c, Myolis rclifer (xl^/^) ; d, Pipistrellus suhflavus (x2). After Miller, N. Am. 

 Fauna No. 13, Bureau of the Biol. Sur., U. S. Dept. of Agri. 



acter which certainly distinguishes the species of this genus is the 

 presence of six teeth behind the canine on each side of the upper 

 jaw. This character is not possessed by any other bats found in 

 eastern North America. 



The genus is widely distributed, being represented by several 

 species in each of the continents. In Indiana it is represented by 

 three species which, to the unpracticed eye, l)ear a close resemblance 

 to one another. 



The following key will serve to distinguish them: 



Size hii'^o ; forcni'iu 42 www. (1 11/1(1 in. ) oi- more. griHCSCCns. 

 Sizo smaller; forearm never over mm. (1 S/K; in.). 



Ear and trains Ions, slender and gradually tapering. suhulatus. 



Ear and tragns broad, the latter blnntly ronnded. lucifugus. 



