162 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
Peters, A. ravus (Miller), A. rosenbergi Thomas, A. toltecus Saus- 
sure, A. watsoni Thomas. 
Remarks. — According to the presence or absence of the vanishing 
q 
last molars, the species may be arranged as follows: Molars g, 
O 
planirostris ; molars g, coryi , glaucus , intermedins, jamaicensis , 
lituratus , palm arum, parvipes, rosenbergi, watsoni / molars 2 > 
einereus, phceotis , guadrivittatus , ravus, toltecus. The species of 
the first group has been associated with the very different JJroderma 
bilobatum, those of the second are Artibeus in a restricted sense, 
while those of the third have been called Dermanura , either as a 
subgenus of Artibeus or as a distinct genus. After examining prac- 
tically all the known species, I can see no good reason for subdi- 
viding the genus Artibeus further than by removing Uroderma and 
Enchistlienes. There appear to be no other characters correlated with 
the different tooth formulas; and the presence or absence of these 
terminal teeth, when reduced to the vanishing point and entailing no 
change in the form of the surrounding bone, is of little importance. 
Genus ENCHISTHENES Andersen. 
1906. Enchistlienes Andersen, Ann. and Mag. Nat. Hist., 7th ser., XVIII, p. 
420. December, 1906. 
Type-species. — Artibeus liarti Thomas. 
Geographic distribution. — Island of Trinidad, West Indies. 
Number of forms. — The type is the only species known. 
Characters . — Similar to Artibeus, but inner upper incisor not bifid, 
and third molar both above and below well developed and effecting 
the form of the surrounding bone. 
Species examined —Enchistlienes harti (Thomas). 
Remarks. — This genus is well differentiated from Artibeus by the 
simple form of the inner upper incisor and the large size of the pos- 
terior molar in both upper and lower jaws. The only species at 
present known is further distinguished from the members of the 
genus Artibeus by the presence in the tragus of “ a pointed upwardly 
directed projection on the inner margin near the tip.” 
Genus ARDOPS Miller. 
1891. Stenoderma Thomas, Ann. and Mag. Nat. Hist., 6tli ser., VII, p. 529. 
June, 1891 (part). 
1898. Stenoderma Trouessart, Catalogus mammalium, p. 162 (subgenus, 
part). 
1906. Ardops Miller, Proc. Biol. Soc. Washington, XIX, p. 84, June 4, 1906. 
Type-species. — Stenoderma nicholtsi Thomas. 
Geographic distribution— Lesser Antilles. 
