300 CACAJAO 



during a great part of the year, and they never descend to the ground ; 

 the short tail being no evidence of terrestrial habits such as those of the 

 short-tailed Baboons of various genera. 



LITERATURE OF THE SPECIES. 



1812. E. Geoffroy St. Hilaire, in Annales du Museum d'Histoire 

 Naturelle, Paris. 



Cacajao calvus described as Brachyurus calvus, and C. 

 melanocephalus as Pithecia melanocephala. 



1823. Spix, Simiarum et Vespertilionum Brasiliensium. 



Under the genus Brachyurus two species are given : C. melano- 

 cephalus redescribed as B. ouakary; and B. israelita = 

 Pithecia chiropotes E. Geoffroy. 



1840. R. P. Lesson, Species des Mammiferes Bimanes et Quadru- 

 manes. 



Two forms recognized by the Author are placed in Cacajao, 

 but this is made a subgenus of Pithecia. The species recog- 

 nized is C. melanocephalus with "variete d'age"? B. ouakary 

 Spix, = C. melanocephalus. 



1845. E. Geoffroy Saint-Hilaire, in Archives du Museum d'Histoire 

 Naturelle, Paris. 



Two species are here first described under the genus Brach- 

 yurus: B. rubicundus, and B. calvus. 



1862. Reichenbach, Die V ollst'dndigste Naturgeschichte der Affen. 



Cacajao here contains C. ouakary = C. melanocephalus; 

 and C. melanocephalus ; the remaining species being included 

 in Brachyurus: (B.) rubicundus and (B.) calvus. 



1870. /. E. Gray, Catalogue of Monkeys, Lemurs and Fruit-eating 

 Bats, in Collection of the British Museum. 

 In this List the three species above described are placed in a 

 new genus 'Ouakaria! Individuals varying in white or red 

 hues are considered as albinos of C. melanocephalus ! 



1876. Schlegel, Museum d'Histoire Naturelle des Pays-Bas, Simice. 



Three species already described are here placed in the genus 

 Pithecia, and a supposed white form from the banks of the 

 river Japura, represented only by an uncolored drawing in 

 Bates' book, "The Naturalist on the River Amazon," (no 

 specimens from that locality having been seen), is described as 

 Pithecia alba — Cacajao calvus. 



