452 MAMMALIA. 



tal 36. Head large and round ; muzzle short ; eyes very large 

 and approaching ; nostrils separated by a very thin partition ; 

 ears small ; tail as long as the body, covered with hair, but not 

 prehensile. 



Aotus trivirgatus. — The Doukoucouli. — Plate V*. fig. 10. 

 — Hair of the body gray, mixed with white, exhibiting a silvery 

 lustre in the sun, and a brown line passing down the back; fore- 

 head with three black divergent lines ; face blackish and hairy ; 

 mouth surrounded by bristly hairs ; palms of the hands white ; 

 tail brushy, half as long again as the body ; no external ears. 

 Length of the body nine inches and a half. Inhabits the forests 

 of Maypura and Esmeralda, South America. 



Genus 14. — Pithecia. — Desmarest. 



Generic Character. — Incisors *, canines J-J, grinders ^^s 5 to- 

 tal 36. Facial angle 60 degrees ; ears rounded ; tail a little 

 longer than the body, not prehensile, and covered with long 

 hair ; feet with five toes ; nails short and sharp. 



Pithecia rufiventer The Fox -Tailed Monkey. — Plate 



V**. fig. 3. — Fur dusky brown, with a slight rusty tinge, ex- 

 cept on the head and face ; from the top of the nose to the chin 

 It is black ; face dark brown, surrounded by white downy hair, 

 which rises on each side of the forehead, like a wig, diverging 

 from the centre of the forehead ; bushy at the cheeks ; eyes 

 large i ears round and flat ; tail equal to the length of the body, 

 thick, like that of a fox, but more bushy. Size of a domestic 

 cat. Inhabits French Guiana. — See vol, II. p. 441. 



Genus 15. — Jacchus. — Desmarest, 



Generic Character. — Ineisory teeth *, canines J^J, grinders 

 l^l ; total 36. Facial angle 50 degrees ; head round ; muzzle 

 short ; occiput prominent ; tail longer than the body, soft, and 

 entirelv covered with hair ; feet with five toes ; the thumbs of 

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

 opposable ; nails very long, compressed, arched, and pointed. 



Sub-Genus I. — OuiSTiTL — Geoffroy. — Intermediate ineisory 

 teeth of the upper jaw broader than the lateral ones, isolated 

 on each side ; lower ineisory teeth elongated, narrow, vertical, 

 the lateral ones longest ; upper canines conical, of medium 

 length, the two inferior ones very small. 



