244 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



Principal subdivisions. — Ten genera of Molossidse are now known. 



KEY TO THE GENERA OF MOLOSSIDyE. 



Bony palate with conspicuous median eniargination extending back of roots 

 of incisors. 



Depth of brain case only about one-third width ; coronoid process long 

 and slender, conspicuously recurved ; forearm covered with warty 



excrescences Platymops, p. 254 



Depth of brain case at least one-half width ; coronoid process short 

 and thick, not recurved ; forearm without warty excrescences. 



Upper premolars 1-1 ilormopterus, p. 253 



Upper premolars 2-2 Nyctinomus, p. 251 



Bony palate without conspicuous median eniargination, but a small notch 

 may be present which never extends back of roots of incisors. 



Upper incisor with length along eingulum equal to or greater than 

 height of shaft. 



Skull without conspicuous sagittal crest ; crown of first upper 

 molar subquadrate ; a space between upper incisor and ca- 

 nine Gheiromeles, p. 249 



Skull with high knife-like sagittal crest ; crown of first upper 

 molar much wider than long ; no space between upper incisor 



and canine Molossus, p. 260 



Upper incisor with length along eingulum decidedly less than height 

 of shaft. 



Crown of lower incisors with conspicuous concave posterior pro- 

 longation extending back between canines Eomops, p. 245 



Crown of lower incisors without posterior prolongation. 



Palate conspicuously domed (deeply concave both laterally 



and longitudinally) Proutopn, p. 259 



Palate arched (concave laterally but scarcely, if at all, longi- 

 tudinally). 



Rostrum noticeably flattened, its length about equal to 



lachrymal breadth Molosaops, p. 247 



Rostrum subcylindrical, its length considerably greater 

 than lachrymal breadth. 



Upper incisors in contact with each other, their crowns 



expanded posteriorly Eumups. p. 257 



Upper incisors not in contact, their crowns not ex- 

 panded posteriorly Chcerephon, p. 244 



Genus CH^REPHON Dobson. 



1874. Chmrephon Dobson, Journ. Asiat. Soc. Bengal, XLIII, Pt. 2, p. 144 



(subgenus of Nyctinomus). 

 1878. yyctinomus Dobson, Catal. Chiropt. Brit. Mus., p. 420 (part). 

 1907. Oharephon Andersen, Ann. Mus. Civ. di Stor. Nat. Genova, 3d ser., 



Ill, p. 35, April 10, 1907 (genus). 



Type-species. — Nyctinomus johorensis Dobson. 



Geographic distribution. — Africa, India, and the Malay reoion. 



Number of forms. — Eleven species referable to this group are now 

 known. 



Characters. — Similar to Nyctinomus (p. 251) in all respects except 

 that the premaxillary bones are complete, their palatal branches iso- 



