CHAPTER XI.

THE CEBIDÆ (_concluded_)--THE SQUIRREL MONKEYS--DOUROUCOULIS--SAKIS.

General Description of the Second Division of Cebidæ--Without Prehensile Tails--THE SQUIRREL MONKEYS--Described by Buffon and Humboldt--Peculiarities of the Species--Anecdotes by Le Vaillant--A Tragic End--THE WIDOW MONKEY--Origin of the Name--THE ONAPPO--Its Nocturnal Habits and Peculiar Cry--THE DOUROUCOULIS, OR OWL MONKEYS--General Description of the Family--Peculiar Formation of the Arm-bone--THE THREE-STRIPED OWL MONKEY--Described by Humboldt and Bates--THE RED-FOOTED DOUROUCOULI--THE SAKIS--Remarkable Resemblance in the Face to Man--Structural Peculiarities--THE COUXIO--THE PARAUACÚ--THE MONK--Description of the Brain--Other Varieties of the Sakis--Anecdotes of them--THE BLACK-HEADED SAKIS--General Description 185