lii 



INTOKRELATIOXS OF G15XERA. 



cusps has been carried to an extreme, so as to render the molari- 

 form teeth raulticuspidate (for a discussion of the homologies of the 

 cusps see pp. 801-803 and fig. 79). Externally, the onlj- noteworthy 

 modification is the loss of the tail (wing-membranes normal, claw 

 of second finger present). 



The nine genera reviewed above constitute what may be termed 

 the Ronsettine section of Megachiroptera, in contradistinction 

 to the Epomophorine, Cynopterine, and Macroglossine sections. 



Harpyionycteris 



PCeralopsx 



Acerodon 



Dobsonia 



Fig. II. — Interrelations of the gcner.a of the Eousetti/s section. 



It has divided into three branches (.sub.sections); the Rousettine 

 branch {Ronsettus, Eidolon, Boneia), characterized by the simple, 

 unmodified cranial characters (rostrum never shortened, premaxillae 

 not sublinear, occiput not elongated, &c.), by the full Mega- 

 chiropteran dental formula (except for the loss of i' in Boneia, and 

 the occasional deciduousness of p'), the simple form of the premolars 

 and molars, and externally by the presence of a tail and by having 

 nearly always the third metacarpal slightly but distinctly longer 

 than the fourth and fifth ; the Pteropine branch {Pterojius, 

 Acerodon, Pteralopex, Stylo cteniuni) : cranial characters Rousettine, 

 except for the more " subtubular " occiput and relatively narrower 



