200 BULLETIN 57-, UNITED STATES NATIONAL MUSEUM. 



Upper "incisors 1-1. 



Ears noticeably enlarged ; audital bulla? much wider than space 



between them Otonycteris, p. 215. 



Ears not noticeably enlarged ; audital bullae not as wide as 

 space between them. 



First and second upper molars" with mesostyle reduced, the 

 W pattern distorted or nearly absent ; first and second 

 lower molars with second triangle smaller than first. 



PacJiyotns, p. 219. 

 First and second upper molars with normal cusps and 

 ridges, the W pattern not distorted ; first and second 

 lower molars with second triangle larger than first. 

 Skull short and deep, the depth of braincase, including 

 audital bulla, about one-half greatest length; meta- 

 carpal of 3d, 4th, and 5th fingers successively much 



shortened Dasypterus, p. 222. 



Skull normal, the depth of braincase, including audital 

 bulla, considerably less than one-half greatest 

 length ; metacarpal of 3d, 4th, and 5th fingers about 

 equal in length. 



Third lower incisor noticeably smaller than first 

 or second. 



Crown of third lower incisor in line with 

 crowns of first and second, the tooth func- 

 tional Rhogeessa, p. 218. 



Crown of third lower incisor scarcely visible 

 under cingulum of canine, the tooth func- 



tionless Baodon, p. 218. 



Third lower incisor as large as first or second. 



Third upper molar with well-developed meso- 

 style, metacone, and three commissures. 

 Lachrymal breadth greater than alveolar 



■ breadth Scotwcus, p. 217.' 



Lachrymal breadth less than alveolar 



breadth X i/cticeius, p. 216. 



Third upper molar with mesostyle rudimen- 

 tary or absent, and metacone very minute; 

 only two distinct commissures present. 

 Depth of maxillary emargination equal 

 to distance between canines. 



Scoteinus, p. 217. 



Depth of maxillary emargination scarcely 



more than one-half distance between 



canines Scotomanes, p. 217. 



Genus MYOTIS Kaup. 



1829. Myotus Kaup, Skizzirte Entw.-Gesch. u. Natiirl. Syst d. Europ. 

 Thierw., I, p. 106 (myotis). 



1829. Xvstactes Kaup, Skizzirte Entw.-Gesch. u. Natiirl. Syst. d. Europ. 

 Thierw., I, p. 1(18 (Icixlcri). Not Xi/stactes Gloger, 1827. 



1830. Leiicnnor Bote, Isis, p. 256. (Die Wasserfledermause. ) 



1839. Vcxprrtilio Kkyserling and Blasius, Wiegmann's Archiv fur Natur- 

 gesch., I, p. 300 (not of Linnaeus, 1758). 



