﻿9G 



NORTH AMERICAN FAUNA. 



Generic characters. — Dental formula : i, ^ j c, ^ ^ 5 J ^^^^ ^-^=32. 



Skull (tigs. 24: iiud 25) large and heavily built; rostrum broad in propor- 

 tion to brain case (less so than in Lasionycteris)^ scarcely concave at sides 

 back of nasal aperture; dorsal profile nearly straight, rising gradu- 

 ally from external nares to occiput, which in the adult is strongly 

 angular and provided with a conspicuous sagittal crest. Ears short, 

 considerably narrower than long, basal lobe well developed, but not 

 excessively large. Tragus straight, short, directed slightly forward, 

 broadest near the middle and tapering to a moderately sharp point. 

 Back of interfemoral membrane wholly naked except for a sprinkling 

 of liairs on basal fourth. Mammte, 2. 



General remarlcs. — The genus Yespertilio contains the largest Ameri- 

 can species of the Yespertilionine group. Aside from the dental for- 

 mula, the large size of YespertiUo fiiscus, the only known North Ameri- 

 can si)ecies, is sufficient to distinguish the genus among those occurring 

 in the region now under consideration. 



The Xorth American species is separable into at least five tolerably 

 well-marked subspecies as follows : 



KEY TO THE SUBSPECIES OF VESPEIITILIO EUSCUS. 



Size small (total leugth, 96 to 107; forearm, 40 to 45; longest finger^ 68 to 77). 



Breadtli of muzzle greater than half length of head proxnnquus (p. 100) 



Breadth of muzzle less than half length of head hahamensis (p. 101) 



Size large (total length, 105 to 122; forearm, 43 to 52; longest huger, 77 to 96). 



Membranes and ears thick and leathery, the ears distinctly thickened along- 

 anterior horder.. fnsciis (p. 96) 



Membranes and ears thin, the ears scarcely thickened along anterior border. 



Forearm, 47 to 50; longest finger, 85 to 89 (average 86) cuhensis (p. 102) 



Forearm, 50 to 52; longest finger, 85 to 96 (average 90) . .miradorensis (p. 99) 



VESPERTILIO FUSCUS Beauvois. Brown Bat. 



1796. VtsperiUlo fascus BeauA'ois, Catal. Peale's Museum, p. 14. (Philadelphia, Pa.). 

 1806. respertUio caroUnensis Geofiroy, Ann. Mus. d'Hist. Nat., Paris, VIII, p. 193. 

 (Carolina.) 



1818. Fesprrtilio phaiops Kafines(|ue, Am. Monthly Mag., Ill, p. 445. (Kentucky.) 

 1820. Epiesirns mchoiops Eafinesque, Annals of Xature, p. 2. (Kentucky.) 

 1823. Vcspcrtilio arquatus Say, Long's Expedition to Rocky Mountains, I, p. 167, 

 footnote. 



1835. Vespcriilio iwsinus Tcmmincls:, Monogr. de Mammalogie, II, p. 235. 



1843. Scoto2)]iiIus greenii Gray, List Spec. Mamni. Brit. Mus., p. 30 (nomen nudum). 



1864. 8coiophUt(sfn:iCus H. Allen, Monogr. N. A. Bats, p. 208. 



1878. Vesper atjo serotinus var. Vesperus fuscus Dobson, Catal. Chiroptera Brit. Mus., 

 p. 193. 



1893. AdeJonijcteris fascus H. Allen, Monogr. Bats N. A., p. 112. 



Type locality. — Philadelphia, Pa. 



Geographic distribution. — Austral, Transition, and (lower edge of) 

 Boreal zones throughout the United States and adjoining British 

 provinces. 



General characters. — Size large; total length, 110 to 112; tail verte- 

 brae, 41 to 52 ; forearm, 43 to 40 ; longest finger, 77 to 84; ear, 11.0 to 14; 



