﻿62 



NORTH AMERICAN FAUNA. 



about twice as long as broad. Larger cusp placed at extreme anterior 

 end; tbe smaller one on tbe inner edge near x)Osterior border. Crown 

 of second incisor subterete, unicuspidate. Crown of first premolar 

 longer tban second when viewed from the side, slightly larger, or in 

 rare cases very much larger than the latter in cross section; the two 

 teeth in line, or second slightly displaced inward. There is nothing 

 characteristic in the form of the third premolar or of the molars. 

 Maxillary incisors as usual in the genus, the middle x)air and the next 

 compressed and trifid, the outer much larger and subterete. First 

 maxillary premolar with crown longer than the second when viewed 

 from the side, and one iburth to one-third larger in cross section; the 

 two teeth i)erfectly in line, or second slightly displaced inward. Third 

 premolar subquadrate, nearly as broad as long. The lower molars 

 show no distinctive characters. 



As comi)ared with M. suhulatus, the species with which it is most 

 likely to be confused, Myotis lucifugus shows numerous differences in 

 dental characters. The tooth row, as a whole, is shorter, and the indi- 

 vidual teeth relatively smaller. The first and second premolars in each 

 jaAv are actually smaller, and in most specimens more nearly equal in 

 size in cross section. In M. subulatus the premolars are so large that the 

 second is often crowded inward from the tooth row, a condition rarely 

 seen in M. lucifugus. The form of the third lower premolar is very 

 difi^'erent in the two species. When viewed from the side, this tooth 

 is conspicuously broader in proportion to its heigh in M. subulatus. 

 When viewed from above, the tooth is much larger in M. subulatus, and 

 distinctly longer than broad, while in 31. lucifugus it is nearly as broad 

 as long. 



Measurements. — See table, i)age 65. 



Specimens examined. — Total number 562, from the following localities: 



Alabama: Greeusboro, 1 (skin, Merriam coll.), 

 Alaska : Kartiak Island, 9. 

 Connecticut: 1 (Merriam coll.). 



District of Columbia: Washington, 20 (majority in Merriam coll.). 



Florida: Tarpon Springs, 7 (two skins, Rhoads coll., type and topotypes of 



' austroriparius') . 

 Illinois: Warsaw, 141; West Northfield, 2. 

 Kentucky : Mammoth Cave, 218. 

 Maine: Eastport, 1. 

 Maryland: Seneca River, 1. 

 Massachusetts: Woods Hole, 1. 

 Minnesota : Elk River, 7 ; Fort Snelliug, 4. 

 Newfoundland: Bay St. George, 4 (skins. Bangs coll.). 



New York : Adirondacks, 1 (Merriam coll.) ; Big Moose Lake, 1 (Merriam coll.) ; 



Catskill Mountains, 2; Howes Cave, 25 (Merriam coll.); Lake George, 1; 



Locust Grove, 9 (Merriam coll.) ; Lyons Falls, 4 (Merriam coll.) ; Oneida Lake, 



63 (Miller coll.); Peterboro, 1 (Merriam colL); Sing Sing, 1 (Merriam coll.) ; 



West Point, 1. 

 North Carolina: Roan Mountain, 1= 

 Nova Scotia: Halifax, 1. 



