504 



HYPSIGNATiroS. 



undivided, like corresponding ridges of Epomops ; all postdental 

 ridges thin, serrate, often conspicuously asymmetric (see figure), 

 either all undivided or a few of them slightly divided at middle. 



Pig. 34. — Palate-ridges. A, Epomops franqiieti (80.7.21.1); B, Epomops 

 dobsoui (5.6.9.3) ; C, Hypdgnathus montitrosus (G2.1.23.1). \. See test. 



External characters. — Head large, anterior extremity of muzzle 

 thiol? and truncate (hammer-shaped) in males, considerahly lower 

 in females ; dorsal surface of muzzle in males enormously, in 

 females much less, elevated above the nasal apertures ; on either 



. A 1 Al 



Fig. 35.— Extremity of muzzle of Hyp^ignnilnis movstrosws, male (62.1.23.1) 

 and female (4.8.28.1), to show' sexual diflereuce. \. See text. 



side of extremity of muzzle a prominent vertical cutaneous fold, 

 continuous above with inferior margin of nostril and below with 

 horizontal margin of upper lip, this fold large and leaf-like in adult 

 males (fig. 35 6 ), much less developed in females (fig. 35 $ ) ; front 

 face of upper lip, between cutaneous folds, and corresponding face 

 of lower lip greatly expanded both transversely and vertically, and 

 densely papillate. Ears more abruptly attenuated above than in 



