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NORTH A.MERICAN FAUNA. 



ILLl'STRATIONS. 



The illustrations in this paper are reproductions of peu-and-iuk 

 drawings made under my constant supervision by Mr. Frank Miiller. 

 Special difficulty has been encountered in obtaining satisfactory repre- 

 sentations of the external ear and of the crowns of the teeth. 



The ears of alcoholic specimens are generall}^ sufficiently altered in 

 form, by pressure and by the action of the preservative fluid, to 

 retain only approximately the appearauce which they had in the living 

 animal. This is especially the case with such large-eared species as 

 Antrozous lyaUidus^ Corynorliinus macrotis, Myotis erotis, and others. 

 In the impossibility of reproducing their original appearance, it has 

 been thought best to represent the ears in a uniform but somewhat 

 unnatural position, with the conch flattened and the external basal 

 lobe turned outward. This will account for the apparently undue 

 width of certain drawings. 



The crown views of the teeth were first sketched with the aid of a 

 camera lucida and afterwards corrected and finished by the use of hand 

 lenses. The great difficulty in obtaining accurate and uniform results 

 arose from the impossibility of keeping specimens in exactly com- 

 parable positions and from the considerable changes in outline result- 

 ing from every slight variation in the angle of vision. Therefore the 

 drawings are not wholly satisfactory. They are published, however, 

 in the belief that, such as they are, they may help to an understanding 

 of the characters of the species. 



NOMENCLATURE OF NORTH AMERICAN TESPERTILIONID^. 



To arrive at final conclusions in regard to the nomenclature of the 

 Yespertilionidce of ^orth America, it will be necessary to consider in 

 detail all names that have been based on those members of the group 

 that inhabit the region in question, and also a few based on allied Old 

 World species. The names may best be taken up alphabetically. 



1. Generic and Subgeneric Names. 



Adelonycteris H. Allen, 1892 (Proc. Acad. Xat. Sci., Phila., 1891, p. 466, 

 Jan. 19, 1892), was proposed as a substitute for Yesperns Keys. & Bias., 

 preoccupied in Entomology by Yesperus Latreille, 1829. The name is, 

 however, a synonym of YespertiUo Linnaeus, 1 758, Eptesicus Eafinesque, 

 1820, and also of Cnephams Kaup, 1829. 



Aeorestes Fitzinger, 1870 (Sitzungsber. Math.-Xat. CI. K. Akad.Wiss., 

 Wien, LXII, Abth., I, pp. 427-436), is a synonym of Myotis Kaup, 1829. 

 The group included three South American species, Myotis villosissimus, 

 M. nigricans, and M. albescens. 



Antrozous H. Allen, 1862 (Proc. Acad. Xat. Sci. Phila.. p. 248), is the 

 only generic name based on YespertiUo pallidus Le Conte. 



