l82 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



LONCHORINA AURITA Tomes 



Tomes' Long-eared Bat 



Lonchorina aurita Tomes, Proc. Zool. Soc. London, 1863, p. 83. Type from 

 West Indies. 



The distinguishing characters of ft the species have been given under 

 the genus. The forearm measures about 53 millimeters. 



Fig. 6. — Lonchorina aurita. 

 No. 174904, U. S. Nat. Mus. About nat. size. 



Mr. Miller (1912, p. 23) has published detailed measurements of 

 two adults, a male and a female, collected in the Chilibrillo cave, near 

 Alhajuela, by August Busck, April 14, 191 1. Mr. Busck obtained 

 five additional specimens at the same locality in March, 191 2. The 

 species is mainly West Indian in known distribution and has not been 

 recorded from elsewhere in Middle America. 



Specimens examined: Rio Chilibrillo (Chilibrillo cave near Alha- 

 juela), 7. 



Genus TONATIA Gray 



In general external characters Tonatia is similar to Micronycteris, 

 but the single species known to occur in Panama is decidedly larger 

 (forearm about 53 mm.) than the regional representative of the 

 latter genus (forearm about 32 mm.). The skull is more massive in 

 general structure, but has a narrower palate and more constricted 

 interorbital region than Micronycteris. More important differential 

 characters are exhibited by the teeth. The upper canines are rela- 

 tively larger and nearly in contact with the median incisors, thus 

 forcing the outer incisors out of line ; the large lower canines meet 

 behind the incisors, which are reduced to two in number ; the median 

 lower premolar is obsolescent, its crown reaching about the level of 

 the anterior premolar, instead of being a well-developed functional 

 tooth as in Micronycteris. The teeth are 32 in number. 



