THE FAMILIES AND GENERA OF BATS. 85 



moved the Molossine genera to form a subdivision of the Vesper- 

 tilionidae. 



Principal subdivisions. — The genera of Emballonuridse as a whole 

 form a very homogeneous group, but the South American Diclidu- 

 rus is so different from the others that it must be regarded as forming 

 a distinct subfamily. 



KEY TO THE SUBFAMILIES OF EMBALLONURIMl. 



Postorbrtal process slender, distinct; clavicle not expanded. 



Emballonurinw, p. 85. 



Postorbital process broad, almost obliterated by the very wide supraorbital 



ridge ; clavicle greatly expanded DioUdurinw, p. 94. 



Subfamily EMBALLOHSTTXRIUNT^E. 



1866. Emballonurina, Gray, Ann. and Mag. Nat. Hist., 3d ser., XVII, p. 92. 



February, 1866. 

 1878. Emhallonurw Dobson, Catal. Cbiropt. Brit. Mus., p. 353. 

 1886. Emballonurw Gill, Standard Nat. Hist., V, p. 169. 



Geographic distribution. — Same as that of the family Embal- 

 lonuridse (p. 83). 



Characters. — Postorbital processes long and curved, in no way 

 obscured by supraorbital ridges, their length at least four times 

 their width; clavicle normal, its greatest width about one-sixth its 

 length; tibia either subterete or with outer side flattened. 



Principal subdivisions. — At least eleven well-defined genera may be 

 recognized among the members of the subfamily Emballonurinae. 



KEY TO THE GENERA OF EMBALLONURINA. 



Upper incisors 2-2; wings without pouches Emballonura, p. 86. 



Upper incisors 1 - 1 ; wings with or without pouches. 

 Wings without pouches : 



Heavily built species with forearm usually more than 50 mm. ; 



frontal region of skull conspicuously concave Taphozous, p. 93. 



Lightly built species with forearm less than 50 mm. ; frontal region 

 of skull not conspicuously concave. 



Anterior upper premolar (jm*) styliform ; muzzle not notice- 

 ably produced Goleura, p. 87. 



Anterior upper premolar (pm 2 ) lancet shaped; muzzle notice- 

 ably produced Rhynchiscus, p. 88. 



Wings with pouches : " 



Molars without hypocones; upper incisors absent in adult. 



Myropteryx, p. 91. 

 Molars with hypocones ; upper incisors present in adult. 



Premaxillaries rudimentary above, much exceeded by greatly 



inflated anterior portion of rostrum Balantiopteryx, p. 92. 



Premaxilaries well developed above, their extremities lying 

 distinctly on upper surface of rostrum. 



Muzzle and anterior root of zygoma so little expanded 

 that tooth rows are visible from above. 



Centronycteris, p. 91. 



