CEBID.E. 37 



dorately dilated behind. Claws compressed. Nostrils oblong, rather 

 close below. Hair of crown woolly. 



Section B. TnicuiuitA. Tail hairy to the tip, not, or only feebly, pre- 

 hensile. 



.Tribe III. Cebina. Grinders £ . £ ; cutting-teeth vertical, in a regular 

 series with the canines. Claws blunt. Lower jaw not dilated behind. 

 Nostrils far apart. 



/>. Cebus. Head largo. Claws guttered. 



Tribo IV. Callithichina. Grinders £ . £ ; cutting -teeth vertical, in a 

 regular series with the canines. Lower jaw dilated behind. Eyes 

 moderate, diurnal. Nostrils far apart. 



(>. Saimiiu. Head large, elongate ; forehead well developed. 



7. Callithrix. Head small, depressed ; forehead small. 



Tribe V. Nyctipithecina. Grinders %.%; cutting-teeth vertical, in a 

 regular scries with the canines. Lower jaw dilated behind. Eyes very 

 large, nocturnal. Nostrils close together, as in the old-world apes. 



8. Nyctipithecus. Head large, rounded ; forehead slightly developed. 



Tribe VI. riTHECiNA. Grinders £ . £ ; lower cutting-teeth large, shelv- 

 ing, converging, separate from the canines. Lower jaw not dilated 

 behind. Fur harsh, elongate. Claivs blunt. 



9. riTHECiA. Tail club-shaped. Hair of crown like a wig. Chin 



slightly bearded. 



Tribo VII. BitACHYUJiiNA. Grinders £ . £ ; lower cutting-teeth large, 

 shelving, converging, separate from the canines. Lower jaw dilated 

 behind. Fur soft, silky. Claws blunt. 



10. CinnopoTE.s. Tail elongate, club-shaped. Crown with long hair like 



a wig. Chin large, bearded. Limbs short. 



11. Ouakauia. Tail subcylindrical, short. Crown with short hairs. 

 Chin scarcely bearded. Limbs elongate. 



Tribo VIII. IIapaeina. Grinders £ . £ ; loivei- cutting-teeth vertical. 

 Lower jaw not dilated behind. Thumbs developed, but never opposable 

 to the fingers. 



* Lower cutting-teeth elongate, slender, linear, of the same size as the 



canines. 



12. Hapale. Ears with a fan-like pencil of hairs on the inside of tho 

 conch. 



13. Iacciius. Ears with a fan-like pencil of long hairs on forehead iu 



front of the conch. 



14. Cebuella. Ears small, naked, hid in the fur. 



1/5. Mico. Ears largo, naked, oxserted, without any pencil of hairs, 



* * Lower cutting-teeth short, subtruncalc ; lower canines large, pro- 



minent. 



10. Leontopitiiecus. Head and face with long silky hair. 



17. (Edipus. Sides of the head naked; crown with a tuft of hairs. 



