JACCHUS. . MAMMALIA. 57 



P. miriquoina, Geoff. Desm. (Miriquoina Azara.) Pur gray brown 

 above; cinnamon-coloured below; hair of the back annulated, first 

 with white, with black in the middle, and white at the point; 

 two white spots above the eyes; no beard; tail a little longer than 

 the body. Body about 14 inches in length. Inhabits S. America. 



P. rufibarba, Desm. Kuhl. The red-headed Saki. Body of a 

 brown black above ; below of a pale red ; pale red above the eyes ; 

 tail pointed at the end Inhabits Surinam. 



P. ochrocephala, Desm. Kuhl. Yellow-headed Saki. Fur of a clear 

 chestnut colour above ; red ash-coloured yellowish below ; hands 

 and feet of a brown black ; hair of the forehead and around the face 

 of an ochre yellow. About ten inches long Inhabits Cayenne. 



P. monachus, Desm. Geoff. The Monk. Fur variegated with large 

 spots of brown and dirty yellowish white ; hair chiefly brown at 

 its origin, and red and golden towards its extremity ; hair of the 

 head radiating from the occiput and ending at the vertex ; tail 

 nearly the length of the body ; no beard. A little smaller than 

 P. rufivcnter. Inhabits Brazil Buff. Supp. vii. t. 30. 



P. leucocephala, Desm. Geoff. (Simla pit hecia, Lin.) The Yarke. 

 Fur black, around the head of a dirty white ; each hair of one 

 colour ; tail nearly the length of the body ; no beard. Body about 

 ten inches long. Inhabits Guiana; rare Audeb. vi. . i. f. 2. 



P. melanocephala, Desm. (Simia melanocephala, Humb.) The 

 Cacajao. Fur yellowish brown ; head black ; no beard ; tail a 

 sixth shorter than the body. Body about a foot and a half long. 

 Inhabits the banks of the rivers Cassiquiana and Rio Negro in 

 S. America Humb. Obs. Zool. t. 29. 



Gen. 16. JACCHUS, Des. Geoff. Saguinu*, Cuv. Simia, Lin. 



Incisors f , canines ^-^, molars |-, = 36. Incisors and ca- 

 nines variable in their dimensions ; molars with a crown fur- 

 nished with sharp tubercles ; head round ; muzzle short ; oc- 

 ciput prominent ; tail longer than the body, soft, and entirely 

 covered with hair ; feet pentadactyle ; thumb of the anterior 

 hands not opposable; nails very long, compressed, arched 

 and pointed. 



These animals, always of small size (nearly that of a squirrel,) are of a gentle na- 

 ture, and their habits are similar to those of the other American apes. They are 

 easily tamed. Inhabit chiefly Brazil and the Guianas. 



Sub-Gen. 1. OUISTITI, Jacchus, Geoff. Intermediate incisors of 

 the upper Jan) broader than the lateral ones; these last isolated on 

 each side ; lower incisors elongated, narrow, vertical, the lateral 

 ones longest, upper canines conical, and of medium length, the two 

 inferior ones very small. 



* With annulated tail. 

 J. vulgaris, Desm. Geoff. (Simia Jacchus, Lin.) Striated Monkey. 



