120 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



or there is a small diastema between canine and outer incisor. 

 Lower incisors of about the same relative sizes as upper, but outer 

 somewhat less reduced. The crown of the inner tooth is longer 

 than broad and noticeably constricted posteriorly, that of the outer 

 subtefete; cutting edges trifid. The incisors form a continuous row 

 between canines. Upper canines strong, with concave inner surface 

 and distinct anterior and posterior cutting edge and fairly well de- 

 veloped cingulum, but no secondary cusps. Cheek teeth strictly 

 normal ; m 1 and m 2 , with well-developed, hypocone ; to 3 with five 

 cusps and three distinct commissures, its crown surface more than half 

 that of m 1 , middle lower premolar (pm s ) much smaller than other 

 two. Lower molars with cusps normal in size and position. Skull 

 with rostrum nearly as long as braincase, its sides slightly but 

 distinctly inflated from orbit to nares, its dorsal surface with shallow 

 longitudinal groove. Anterior portion of rostrum broad (palate 

 broader anteriorly than posteriorly) ; nares subcircular, opening 

 almost directly forward. Braincase subglobose, its length, breadth, 

 and depth about equal. No distinct sagittal crest or ridges for muscle 

 attachment. Floor of braincase slightly elevated above level of dor- 

 sal wall of choanse. Audital bullae small, covering not more than half 

 of the large cochlea?. Wings from sides of body, the back completely 

 furred. Dermal outgrowths on chin not excessively developed. 



Species examined. — I have examined all of the known forms except 

 C. personata Wagner. 



Genus PTERONOTUS Gray. 



1838. Pteronotus Gray, Mag. Zool. and Bot, II, p. HOO. 



1878. Chilonycteris Dobson, Catal. Chiropt. Brit. Mus., p. 447 (part). 



1890. Ptevonotns Allen, Bull. Amer. Mus. Nat. Hist., Ill, p. 178, December 

 10, 18i)0 (genus). 



1901. Dermonottts Gill, Proc. Biol. Soc. Washington, XIV, p. 177, Septem- 

 ber 25, 1901. 



1904. Dermonotus Rehn, Proc Acad. Nat. Sci. Philadelphia, p. 250. March, 

 1904, issued April 7, 1904. 



1905. Pteronotns Miller, Proc. Biol. Soc. Washington, XVIII, p. 223. Octo- 

 ber 17, 1900. 



Type-species. — Pteronotns danyi Gray. 



Geographic distribution.— Mainland of tropical America north to 

 southern Mexico; also the islands of Trinidad and Dominica, West 

 Indies. 



Number of forms.— Three ; two in South America and the West 

 Indies, the other in Mexico. 



Characters.— Like Chiloin/cteris, but with the wings attached 

 along middle line of back. 



