164 
APES AND MONKEYS. 
specimens obtained on the Rio Negro. Later on, however, Dr. Gray described a 
monkey, brought by Mr. Bartlett from the River Tigri, which flows from the north 
into the Amazon soon after it takes its great easterly bend on leaving Peru, as a 
new species, under the name of Bartlett’s spider-monkey (A. bartletti). It proved, 
however, to be identical with the variegated spider-monkey of the Rio Isegro. 
THE VARIEGATED SPIDER-MONKEY Hat. size). 
The variegated spider-monkey is characterised by its thick, long, and soft hair. 
The general colour of the fur is black, but the cheeks are white. There is a band 
of bright reddish-yellow passing across the forehead a little distance above the eyes ; 
while the under surface of the tail, the under parts of the body, and the inner sur¬ 
faces of the limbs are yellow in the male and greyish-white in the female. With 
the above variations in colour it will readily be imagined that the male of this 
species is a striking animal. In addition to the more sombre tints of the female, 
the lines of separation between the colours are less marked. 
