146 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
but distinct protocone forming entire very narrow inner side of 
tooth and isolated from outer cusps by a distinct median depression. 
Paracone and metacone well developed though narrow; parastyle 
and metastyle small; mesostyle absent. The cones and styles are 
connected by a commissure which forms a sinuous cutting edge but 
no W jzjattern. Third upper molar about half as large as first or 
second, consisting of a short, wide parastyle, a low paracone from 
which a slight commissure extends backward to edge of tooth. First 
and second lower molars with all the cusps indicated but only the 
protoconid and metaconid well developed. Third lower molar with 
no entoconid. Skull rather heavily built. Rostrum about two-thirds 
as long as brain case, the lachrymal region slightly swollen; lach- 
rymal breadth equal to distance from orbit to gnathion. Brain^ase 
rising conspicuously though not abruptly above forehead. Zygomata 
incomplete. Basisplienoid pits broad and shallow. Audital bullae 
small, covering less than half surface of cochleae, their diameter 
slightly less than width of basioccipital. Ears small, separate. Tail 
short, extending to middle of moderately wide interfemoral mem- 
brane, its length about half that of femur. 
Species examined. — I have examined all the known members of 
this genus. 
Genus RHINOPHYLLA Peters. 
1865. Rhinophylla Peters, Monatsber. k. preuss. Akacl. Wissenscli., Berlin, 
p. 355. 
1878. Rhinophylla Dobson, Catal. Chiropt. Brit. Mus., p. 495. 
Type-species. — Rhinophylla pumilio Peters. 
Geographic distribution. — Tropical South America. 
Number of forms. — Only the type species is at present known. 
Characters. — Like Ilemiderma , but tail absent, skull with much 
broader rostrum and lower brain case, and teeth more highly modi- 
fied, though of the same number. Upper incisors like those of 
Ilemiderma, except that the outer is relatively larger, its crown 
distinctly pointed, and inner is bilobed on cutting edge, the lobes 
nearly equal in size. Premolars as in Ilemiderma , but pm 3 very much 
smaller than pm 4 . Molars with the Hemidermine peculiarities 
much exaggerated, the inner portion of m 1 and m 2 so greatly 
reduced that there is practically no protocone ; parastyle and 
metastyle distinct, but low; paracone and metacone low and very 
narrow, producing a faintly two-lobed cutting edge, the posterior 
lobe of which (metacone) is distinctly higher than the anterior. A 
wavy commissure extends from parastyle to paracone and thence to 
metacone and metastyle. On m 1 a faint trace of the inner commis- 
sures may be detected, extending from the two main cusps downward 
