244 BULLETIN 5*7, UNITED STATES NATIONAL MUSEUM. 
Principal subdivisions . — Ten genera of Molossidae are now known. 
KEY TO THE GENERA OF MOLOSSID.E. 
Bony palate with conspicuous median emargination 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 Mormopterus, p. 253 
Upper premolars 2-2 Nyctinomus, p. 251 
Bony palate without conspicuous median emargination, but a small notch 
may be present which never extends back of roots of incisors. 
Upper incisor with length along cingulum 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 Cheiromeles, 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 cingulum 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) Promops , p. 259 
Palate arched (concave laterally but scarcely, if at all, longi- 
tudinally). 
Rostrum noticeably flattened, its length about equal to 
lachrymal breadth Molossops, p. 247 
Rostrum subcylindrical, its length considerably greater 
than lachrymal breadth. 
Upper incisors in contact with each other, their crowns 
expanded posteriorly Eumops, p. 257 
Upper incisors not in contact, their crowns not ex- 
panded posteriorly Chcerephon, p. 244 
Genus CH^REPHON Dobson. 
1874. Chcerephon Dobson, Journ. Asiat. Soc. Bengal, XLIII, Pt. 2, p. 144 
(subgenus of Nyctinomus ) . 
1878. Nyctinomus Dobson, Catal. Chiropt. Brit. Mus., p. 420 (part). 
1907. Chcerephon 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 region. 
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- 
