2i 6 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. X. 



Aotus boliviensis Elliot. BOLIVIAN NIGHT 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 5th. 



Cebus fatuellus peruanus Thomas. PERUVIAN CAPUCHIN MONKEY. 



Four specimens, Todos Santos (i), 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. 



