198 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



n _ ft 



Oheek teeth less than a_a - 



Upper premolars 2-2. 



Upper incisors 1-1 ; metacarpal of third, fourth, and fifth fingers 



successively much shortened ■ Lasiurus, p. 221. 



Upper incisors 2-2 ; metacarpal of third, fourth, and fifth fingers 

 about equal in length. 

 Lower premolars 3-3. 



Audital bullae not specially enlarged ; rostrum broad, con- 

 cave on each side above ; ear shorter than head. 



Lasionycteris, p. 203. 

 Audital bullae much enlarged ; rostrum narrow, evenly con- 

 vex above ; ear much longer than head. 



Anterior edge of orbit distinctly ridged ; nostrils not 

 overhung by glandular outgrowths from side of 



muzzle Plecotus, p. 224. 



Anterior edge of orbit smoothly rounded ; nostrils 

 overhung by conspicuous glandular outgrowth from 



side of muzzle Corynnrliinun, p. 225. 



Lower premolars 2-2. 



Lower cannine small, its tip unequally bifid ; diameter of 

 audital bulla equal to length of tooth row, exclusive of 



incisors; ear much longer than head Euderma, p. 225. 



Lower canine well developed, its tip not bifid; diameter of 

 audital bulla much less than length of tooth row ; ear 

 not specially elongated. 



Braincase conspicuously deepened, its depth including 

 audital bullae nearly equal to its width. 



Chalinolobus, p. 219. 

 Braincase normal, its depth including audital bullae 

 much less than its width. 



Outer upper incisor not extending beyond cingu- 

 lum of inner. 

 Outer upper incisor distinctly cuspidate. 



Scotozous, p. 206. 

 Outer upper incisor with flat crown. 



/(/., p. 206. 

 Outer upper incisor extending distinctly beyond 

 cingulum of inner. 



Fifth finger only a little longer than meta- 

 carpal of fourth and third. 



Pterygistes, p. 207. 

 Fifth finger longer than metacarpal and first 

 phalanx of fourth and third. 



Upper surface of rostrum concave; ears 



joined Barbastella, p. 223. 



Upper surface of rostrum convex ; ears 

 sepa'rate. 



Outer upper incisor normal in posi- 

 tion, its concavity directed back- 

 ward Pipistrellus, p. 204. 



Outer upper incisor pushed outward 

 from its normal position, the con- 

 cavity directed outward. 



Qlischropiiis, p. 205. 



