Mr. Oldfield Thomas, who examined a specimen collected by Mr. Buckley, in Ecuador, points out that it agreed exactly with Humboldt's original description of the female of his Simia caraya, which he describes as having a black head and back, while the sides and belly are yellow. In all recent descriptions, however, the male is described as being nearly uniformly black, and the female uniformly yellow; so that Mr. Buckley's specimen appears to be just such an intermediate specimen as Humboldt described.
According to Prof. Schlegel, adult males sometimes have the black on the hands and feet mixed with yellow.
Distribution.—This is the species of Howler which ranges furthest to the south. It occurs most abundantly in Southern Brazil, Paraguay, and Bolivia, but Mr. Bates records his having obtained a specimen at Villa Nova, on the Upper Amazons, which had come from above Borba, on the Rio Madeira. He did not, however, meet with it on any other part of the Amazon region. Mr. Graham Kerr saw it in troops on the banks of the Pilcomayo river.
Habits.—Like nearly all the Howlers, the present species is of a sulky disposition, in captivity slinking away out of sight when approached. The members of this genus are the only Monkeys which the Indians have not succeeded in taming. They rarely survive their captivity many weeks.
III. THE YELLOW-HANDED HOWLER. ALOUATTA BEELZEBUL.
Simia beelzebul, Linn., Syst. Nat., i., p. 37 (1766).
Mycetes rufimanus, Kuhl, Beitr. Zool., p. 31 (1820).
Mycetes discolor, Spix, Sim. et Vespert., Bras., p. 48, pi. xxxiv. (1823).
? Colobus chrysurus, Gray, Ann. Nat. Hist., xvii., p. 77 (1866).
Mycetes beelzebul, Gray, Cat. Monkeys Brit. Mus., p. 41 (1870); Schl., Mus. Pays Bas, p. 150 (1876).