216 Fre~tp Museum or Naturat History — Zodétoey, Vor. X. 
Aotus boliviensis Elliot. Bottvian Nicot Monkey. 
Three specimens, junction of San Antonio and Espirito Santo rivers. 
All of these are females and seem to be typical representatives of 
this form. They were shot by Mr. Collins at about sunrise on the 
morning of March sth. 
Cebus fatuellus peruanus Thomas. PERUVIAN CAPUCHIN MONKEY. 
Four specimens, Todos Santos (1), Porto Velho (3). 
An adult male and female and two immature examples furnish 
some variation in color, and in the present confused state of knowledge 
of the monkeys of this genus about all that can be said of these partic- 
ular ones is that they are probably related to C. fatuellus. 
The adult male has the sides of the body clay color becoming darker 
toward the mid-dorsal line where a dark brownish line extends from the 
occiput to the tail; top of head black narrowly surrounded with pale 
buffy mixed with black; a dark line passing in front of ears and under 
chin; proximal half of outer side of arms light creamy buff; distal half of 
arms and legs black mixed with buff and ochraceous; toes with a few 
grayish hairs mixed with the black; tail black, the hairs of basal third 
with yellowish tips. 
