I* The family Cebidae is a small family of approximately 14 genera# These genera 
f rl V ' 
are extremely varied in structure and "habitus". 'ftiey can be arranged in the following 
groups * 
1# Cal lice bus # A very generalized, apparently unspecialized, type# Small. 
Primitive in some structural features# Insectivorous-frugivorous# Rirely arboreal# 
Heavy forest# A very active leaper# Only moderately gregarious# 
2# Cebus - Saimiri # Advanced forms, rather similar to Callicebus in size and mixed 
insectivorous-frugivorous diet# Less comj)etely arboreal than Callicebus # Extending into 
fairly light second— growth forest and "edges"# Runners as well as leapers# Very active# 
Very gregarious# 
3# The "marmosets" • A whole host of small insec tivores and carnivores# Not always 
exclusively arboreal# Extending into all sorts of forest and scrub# Runners as well as 
leapers (like squirrels)# Very active# Only moderately gregarious# 
This group includes Callimico # Saguinus # Leontideus # and Callithrix # In many ways, 
the evolutionary trends of this group reach their climax in Cebue 1 la # 
Two independently evolved groups of large "typically monkey-like" forms# 
4# Pithecia - Chir Quotes - Caca.jao # 
5# Lagothrix - Brachyteles - A teles # 
Both groups are insectivorous-frugivorous. Inhabitants of heavy forest. Active. 
Pithecia, etc., are leapers. Lagothrix . etc., are brachiators. Both groups less highly 
gregarious than capuchins or squirrel monkeys# 
6. Alquatta. Large. Leaf -eating. Purely arboreal. Heavy forest. Not very active. 
Slightly sloth-like# Moderately gregarious# / 
7. Actus . Rather small. Insectivorous-frugivorous. Purely arboreal. Heavy forest. 
A very active leaper. Only slightly gregarious. 
