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 Oormura brevirostris. 

 Cm 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 Oormura, 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 

 small, while the figure shows them of 

 normal size for members of the group. 

 No mention is made of the hypocones 

 of the upper molars, but these cusps are unmistakably indicated in 

 the plate. 



Genus BALANTIOPTERYX Peters. 



1867. Balantiopteryx Peters, Monatsber. k. preuss. Akad. Wissensch. Ber- 

 lin, p. 476 (genus). 



1878. Balantiopteryx Dobson, Catal. Chiropt. Brit. Mus., p. 371 (subgenus 

 of Saccopteryx) . 



1904. Balantiopteryx 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 Balantiopteryx have been 

 described. 



Fig. 16. — Balantiopteryx plicata. 

 Adult female. Mokelos, Tehuante- 

 pec, Mexicc. No. 51142. x 2. 



"Peters, Monatsber. k. preuss. Akad. Wissensch., Berlin, 1867, p. 475, plate 

 opposite p. 480. 



