92 
BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
Remarks. — While examining the bats in the Royal Museum of Nat- 
ural History in Berlin I found four specimens from Surinam col- 
lected by Kappler and labeled by Peters as Cormura brevirostris. 
On comparison with the original description and figure of this 
genus,® however, striking discrepancies were at once apparent. An- 
other specimen of the same animal, from Baranciva, Brazil, was 
sent me by Dr. Lorenz von Liburnau, of Vienna, with the informa- 
tion that the type of Cormura , originally in the Natural History 
Museum, could no longer be found. The genus Cormura therefore 
rests wholly on the plate and description; and as these do not agree 
with the specimens it was necessary to name the animal represented in 
the museums of Vienna and Berlin. This genus is well character- 
ized by the complete absence of hypo- 
cones in the upper molars and by the 
great reduction of the upper incisors. 
In the four adults examined the upper 
incisors are absent. In an immature 
individual, however, there are two 
very minute teeth in each premaxil- 
lary. Whether this condition is nor- 
mal can only be conjectured, but 
neither tooth has the appearance of a 
remnant of the milk dentition, no trace 
of which can be found elsewhere. In 
the description of Cormura the upper 
incisors are merely said to be extremely 
fig. 16,-balantiopteryx plicata. small, while the figure shows them of 
adult female. Morelos, tehuante- n0 rmal size for members of the group. 
pec, Mexico. No. 51142. x 2. . . , „ 
No mention is made ot the hypocones 
of the upper molars, but these cusps are unmistakably indicated in 
the plate. 
Genus B ALANTIOPTE RYX Peters. 
1867. Balantiopteryoc Peters, Monatsber. k. preuss. Akad. Wissensch. Ber- 
lin, p. 476 (genus). 
1878. Balantiopteryoc Dobson, Catal. Chiropt. Brit. Mus., p. 371 (subgenus 
of Saccopteryoc) . 
1904. Balantiopteryoc Elliot, Land and Sea Mammals of Middle America 
and West Indies, p. 611 (genus). 
Type-species. — Balantiopteryx plicata Peters. 
Geographic distribution. — Tropical and subtropical mainland of 
America. 
Number of forms. — Only two species of B alantiopteryx have been 
described. 
a Peters, Monatsber.. k. preuss. Akad. Wissensch., Berlin, 1867, p. 475, plate 
opposite p. 480. 
