170 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
Audital bullae very small, covering much less than half surface of 
cochleae. Rami of lower jaw strongly diverging, their spread poste- 
riorly much greater than the length of each ramus. Ear with con- 
spicuous inner lappet. No true noseleaf, but entire face and throat 
a complicated mass of naked dermal outgrowths. Second finger 
moderately bowed outward, about as long as metacarpal of third. 
Calcar well developed. No external tail. Interfemoral membrane 
moderately wide. 
Species examined. — Centurio senex Gray. 
Remarks. — Externally this genus is recognizable by the very short, 
broad face, completely covered with wrinkled dermal outgrowths. 
The skull is distinguished from that of the other short-snouted 
Stenodermines by the position of the external nares directly over 
the roots of the incisors. I can see no reason to make Centurio the 
type of a distinct subfamily. It is very closely related to Sphoero- 
nycteris and Ametrida , and in many ways is connected with the 
typical Stenodermines by such genera as Pygoderma and Phyllops. 
In spite of the great shortening of the rostrum and consequent dis- 
torting of the upper canines, the general type of the dentition is not 
very different from that of Artibeus. 
Genus SPH^RON YCTERIS Peters. . 
1882. Sphcvronycteris Peters, Sitzungsber. k. preuss. Akad. Wissenseh., 
Berlin, p. 988. 
Type-species. — Splicrronycteris toxophyllum Peters. 
Geographic distribution. — Tropical South America (Peru and 
Venezuela) . 
Number of forms. — Only the type species is known. 
Characters. — In general like Centurio / face hairy; muzzle with 
a thickened ridge-like outgrowth, best developed in males; skull 
with rostrum even more shortened than in the related genus, the 
nares so retracted between orbits that they are ' separated from in- 
cisors by a horizontal area the width of which is nearly equal to 
distance between canines; anterior edge of orbit produced into a 
conspicuous, thin plate; palate not. twice as wide as long; zygoma 
noticeably expanded and bent upward at middle; upper incisors 
very unequal, the inner fully one- third as long as canine, conical, 
convex in front, concave behind; the outer minute, flat-crowned, 
closely crowded between first and canine; upper canine not con- 
cave at base; a minute, quadrate third lower molar. Structure of 
teeth in general quite as in Centurio , though the molars are less 
extreme in the development of the Stenodermine peculiarities. 
Species examined.— Sphceronycteris toxophyllum Peters. 
Remarks. — This genus is closely related to Centurio , and it is 
almost impossible to decide which of the two is the more highly 
