SYNOPSIS OF THE 



lowish brown; head black; beard none; tail one sixth 

 shorter than the body. 



Simia Melanocephala. Humboldt. Zool. 06,?. 316. Pithe- 

 cia Melanocephala. Geoff. Ann. Mus. xix. 117. 



Cacajao, caruiri, chacuro, and mono— rabon South Ame- 

 ricans. 



Icon. Humb. Obs. Zool. t. 29. 



Inhabits banks of the Cassiquira and Rio Negro. 



Genus II. — Ouistiti or Hapales. 



Form quadrupedal ; cutting teeth |, canine j-, grinders 

 1=1 , =36. Extremities pentadactylous, the thumb of the 

 anterior hands in the same direction as the fingers, and not 

 opposable ; all the fingers furnished with claws instead of 

 flat nails. 



I. Jacchus. Geofiroy, Facial angle of 50°; head round; 

 muzzle short; occiput prominent ; tail very long, covered with 

 short hairs ; upper intermediate cutting teeth larger than the 

 lateral ones; the lower cutting teeth long, narrow; upper 

 canine conical, lower very small ; grinders acutely tubeixular. 



108. 1. S.J. Vulgaris (the Stunted Monkey or Jacchus). 

 Fur ash-colour; the buttocks and tail annulated with gray, 

 brown and ash ; with a white spot on the forehead ; and a 

 tuft of very long ash-coloured hairs before and behind the 

 ears ; head, and upper part of the neck and shoulders red- 

 dish brown. 



Simia Jacchus. Lin. Sys. Nat. 40. Jaccus vulgaris. 

 Geoff. Ann. Mus. xix. 1 19. Hapale Jaccus, Illiger Prod. 72. 



Ouistiti. Buff. XV. 96. Sagoin. Clus. exot. 372. Sanglin, 

 or Cagui minor^ Edw. Glean. Striated Monkey. Pennant 

 Quad. 224. 



Icon. Buff. XV. t. 14. Ency. Meth. t. 18. /. 4. Audeb. 

 Hist. Fan. 6. §. 2. t. 4. Schreb. t. 33. Fred. Cuvier Mam. — 

 Edw. Glean, t. 218. Shaw. Zool. 1. t.25. Griff. Quad.t. 19. 



Inhabits Guyana and Brazil. 



