^^6 Ml-. 0. Thomas on 



XXXV. — Two new Glossophagine Bats from Central 

 America. By Oldfield Thomas. 



The British Museum has recentlj received from Mr. C. F. 

 Underwood three specimens of a new Glossophagine bat 

 which, although nearly related to Choeroni/cteris, cannot be 

 referred to that genus, but requires a new one for its recep- 

 tion. In working it out I have also found a Choeronijcteris 

 in the Museum collection to need description. 



Hylonycteris, gen. nov. 



External characters as in Cheer onycter is, the nose-leaf, 

 ears, index-finger, interferaoral membrane, and tail all as in 

 that genus. 



Dental formula : — 



C. f, P. I, M. |x2 = 30. 



Upper incisors very small, in a curved row, nearly equally 

 spaced, the outer pair inappreciably larger than the inner. 

 Ko trace of lower incisors. Canines, premolars, and molars 

 as in Choeronycteris, but there is no wide space behind the 

 upper canine, where the "deciduous" anterior premolar 

 might have stood. (I have never seen a case of its persistence 

 in Charonycteris, but there is always a wide space for it, and 

 it is treated as present in all the published dental formulai,) 



Skull of medium proportions, the muzzle neither so deve- 

 loped as in Choeronycteris mexicana nor so reduced as in the 

 species next to be described. Zygomata absent. Bony palate 

 elongate, the posterior narcs level with the middle of the 

 glenoid surfaces. Pterygoid processes normal, not inflated or 

 produced backwards to reach the auditory bullae. Basi- 

 occipital deei)ly excavated on each side of a strong median 

 ridge, the latter continuous with a marked median vomerine 

 ridge. 



'I'ype, Hylonycteris Underiooodi, sp. n. 



This bat is evidently very closely allied to Choeronycteris, 

 but the different structure of its pterygoid and sphenoid 

 regions and the permanent absence of the anterior premolar 

 ap'pear to prevent its being definitely assigned to that genus. 

 In this conclusion 1 have been confirmed by a study ot the 

 characters of C. Godmani, described below, which, at first 

 si"ht appearing far more distinct from Choeronycteris mexi- 

 cana than does Hylonycteris Underwoodi, shows the same 

 -essential structure of tlie base of the skull and the same 



■kcd diastema behind the upper canines. 



