168 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



uniting the pterygoids with inner edge of glenoid fossa?. Between 

 these plates and the audital bullae the median surface of the skull 

 is occupied by a noticeable depression about us large as palate and 

 divided by cross ridges into five secondary depressions, the two pos- 

 terior of which represent the basisphenoid pits. Palatal branches of 

 premaxillaries and the two rather large palatal foramina (each of 

 which is encroached on by a posterior median spine) raised above 

 level of palate, at the front of which is a secondary foramen, trans- 

 versely elliptical in outline, extending from incisors to level of middle 

 of anterior premolars. Audital bulla? small but rather high and 

 narrow, covering less than half surface of cochlea?, their greatest 

 diameter much less than distance between cochlea?. Ear and nose- 

 leaf moderately large, essentially as in Art/bens. Second finger 

 strongly bowed outward, about two-thirds as long as metacarpal of 

 third. No external tail. Calcar and interfemoral membrane mod- 

 erately developed. 



Species examined. — Pygoderma bilabiatuni "Wagner and P. micro- 

 don Peters. 



Remarks. — The members of this genus are at once recognizable by 

 the remarkably shortened and deepened cuboidal rostrum, a character 

 not closely approached by any other known bats. Aside from the 

 form of the rostrum, the skull is not unlike that of Centurio, Spha-ro- 

 nycteris, and Ametrida, with which it agrees in the strongly diverg- 

 ing hamulars, and the widening of the floor of the braincase between 

 palate and audital bulla?, a peculiarity the first stages of which are 

 seen in Phyllops and to a less degree in Ardops, Aritcns, and Stcno- 

 derma. The teeth also show a general resemblance to those of Cen- 

 turio and its allies, though the distortion of the tooth rows as a whole 

 is in the opposite direction. Externally the animals more closely re- 

 semble the true Stenodermine genera. 



Genus CENTURIO Gray. 



1842. Centurio Gray, Ann, and M.ig. Nat. Hist, X, p. 2.~>9. 



1861. Trieliorort/es II. Allen, Ti-oc. Acad. Nat. Sei. Philadelphia, p. 359. 



Subgenus cf Crnfiirio (wciuttrtrli=a&u\t male sener). 

 18G6. TrichocorytCH Gray, Pi-oe. Zool. Soc. London, p. lis (genus). 

 1878. Centurio Docson, Catal. Chiropt. Brit. Mus., p. ."W2. 

 1897. Tricliocoryetex Trouessaet, Catalogs Manmialhun, p. Kil. 

 1901. Centurio Rkhn, Proc. Acad. Nat. Sei. Philadelphia p. 207 June S 



1901. 



Type-species. — Centurio sen ex Gray. 



Geographic distribution. — Central America and southern Mexico. 

 The supposed Cuban record is erroneous." 



Number of forms. — Only one species is now recognized. 



<* See Alston, Biol. (Vut.-Amor. Mamm., 1ST!), p. 51 



