THE FAMILIES AND GENERA OE BATS. 129 



expansion near anterior base. Basisphenoid pits absent. Audital 

 bullae small, covering less than half surface of cocheleaj. Sagittal 

 crest well developed, not divided anteriorly, but continued forward 

 as a line traceable to posterior extremity of nasals. Noseleaf well 

 developed. Ears large, separate or joined across forehead. Tail 

 shorter than femur, extending about to middle of broad interfemoral 

 membrane. 



Species examined. — Tonatia bidens (Spix) and T. venezuelw (Rob- 

 inson and Lyon). 



Genus MIMON Gray. 



1847. Mimon Gray, Proc. Zool. Soc. London, p. 14. 

 1878. Mimon Dobson, C'atal. Chiropt. Brit. Mus., p. 491. 



Type-species. — Phyllostoma bennettii Gray. 



Geographic distribution. — Tropical America, north to southern 

 Mexico. 



Number of forms. — Only the type species is at present recognized. 



Characters. — Dental formula : 

 . -2 3. 1. --34567 . 2-2 1-1 2-2 3 - 3_q 



1--.1. -2-4567*1- 1' c 1 - 1' pm 2 - 2' m 3 - 3 



Teeth like those of Tonatia except that the inner upper incisors are 

 scarcely oblique and are separated from canines by distinct space 

 occupied by well-developed outer incisor, lower canines are not in 

 contact, and the rudimentary middle lower premolar has disappeared. 

 Lower molars with paraconid slightly more distinct than in Micro- 

 nycteris. First upper premolar {pm 3 ) much larger than outer 

 incisor. Lower incisor higher than wide. Skull slender, but with 

 rather broadly arched rostrum noticeably different from the almost 

 half -terete form of the same region in Tonatia, Otopterus, and Micro- 

 nycteris. Zygoma without expansion either in front or behind. 

 Basisphenoid pits broad and shallow, separated by a prominent 

 median ridge. Audital bullas small, covering about one-half surface 

 of cochlea?, but unusually narrow, with almost a ridge along ventral 

 edge; height of bulla on inner side barely equal to width of basi- 

 occipital. Ears large, separate. Tail about as long as femur, ter- 

 minating near middle of broad interfemoral membrane. 



Species examined. — Mimon bennettii (Gray). 



Genus ANTHORHINA Lydekker. 



1855. Tylostoma Gervais, Exped. du Comte de Castelnau, Ainer. Sud., Zool. 



Mamm, p. 49. Not of Sharpe, 1849. 

 1878. Tylostoma Dobson, Catal. Chiropt. Brit. Mus., p. 488. 

 1891. Anthorhina Lydekker in Flower and Lydekker, Mammals living and 



extinct, p. 674. 



Type-species. — Phyllostoma cretmlatum Geoff'roy. 

 Geographic distribution. — Tropical South America. 



25733— No. 57—07 m 9 . . 



