59 



I ^0 I Fig. 45: Choeroniscus inter- 

 medins, skull lateral view 

 C. periosus: Similar to C. minor, but considerably larger. Clearly discernable from 

 Choeronycteris by its lateral skiill contours - lateral shape of the nose rather concave than 

 convex. 



Hylonycteris (fig. 46) 



H. underw'oodi: Skull: resembling Choeroniscus in most characteristics, but lacking the 

 conspicously elongated pterygoid processes. Pterygoids developed normally, as in aknost 

 all genera of this subfamily. 



Ramus mandibularis stronger compared to Choeroniscus, with a more distinctly developed 

 Proc. coronoideus (cf. data of coronoid height). 

 Teeth: dental formula - 2 3 1 - - 3 4 5 6 7 



- - - 1 - 2 3 4 5 6 7 

 The dental features of Hylonycteris correspond to those of Choeroniscus. 



10 mm 



Fig.46: Hylonycteris imderwoodi skull, a: basal view, b: dorsal view, c: lateral view, d: frontal view 

 Choeronycteris (figs. 47-48) 



C. mexicana (fig. 47): Skull: rostrum longer tlian braincase, in lateral view convex in its 

 proximal third up to half the length, flat angle between the nasaha and frontalia (distinct 



