270 ALOUATTA 



of five or six. They are usually met with in the branches of the highest 

 trees, and when disturbed, crawl sluggishly along the boughs. The 

 young, as well as the females, are of the same dense black as the old 

 males, but the hair is shorter and not so glossy." 



In the article from which the above extract has been taken, Dr. 

 Sclater endeavors to prove that the black form of the northern and 

 the one from the southern part of South America are distinct, on 

 account of the different manner in which the hair on the forehead is 

 inclined forward or reversed. It is quite true that the southern and 

 northern Black Howlers are distinct, but the way in which the hair 

 lies on the forehead is not a character to be relied upon, but merely an 

 individual peculiarity exhibited by members of this genus. This is the 

 more misleading in the Howlers, for in other groups, notably Ateleus, 

 the direction of the hair on the head is a character that is of consider- 

 able importance for the arrangement of the different species in their 

 proper position in the genus. 



Alouatta beelzebul (Linnaeus). 



Simla beelzebul Linn., Syst. Nat., I, 1766, p. 37; Bodd., Elench. 



Anim., 1784, p. 61. 

 Cebus beelzebul Erxl., Syst. Reg. Anim., 1777, p. 44. 

 Simla Sapajus beelzebul Kerr., Anim. Kingd., 1792, p. 75, No. 64. 

 Mycetes rufimanus Kuhl, Beitr. Zool., 1820, p. 51 ; Desm. 5 Mamm., 



1820, p. 79 ; Tschudi, Faun. Peruan., 1844, p. 37 ; Geoff., Cat. 



Primates, 1851, p. 53; Wagn., Schreb., Saugth. Suppl., V, 



1855, p. 69 ; Casteln., Exped. Amer. Sud, Mamm., I, 1855, p. 



4 ; Dahlb., Stud. Zool. Fam. Reg. Anim. Natur., f asc. I, 1856, 



p. 175, fig. 172. 

 Mycetes discolor Spix, Simiar. et Vespert. Bras., 1823, p. 48, pi. 



XXXIV. 

 Mycetes beelzebul Gray, Ann. Mag. Nat. Hist., XVI, 1845, p. 220 ; 



Id. Cat. Monkeys, Lemurs and Fruit-eating Bats, Brit. Mus., 



1870, p. 41 ; Reichenb., Vollstand. Naturg. Affen, 1862, p. 67, 



fig. 172 ; Bates, Nat. Riv. Amaz., I, 1863, p. 295. 

 Alouatta beelzebul Forbes, Handb. Primates, I, 1894, p. 197. 



YELLOW-HANDED HOWLER. 



Type locality, "in Brasilia." 



Geogr. Dlstr. Lower Amazon, vicinity of Para to Rio Madeira, 

 Brazil. Peru, (Tschudi). 



Genl. Char. Like A. carava but base of hairs reddish brown. 



