192 



APES, MONKEYS, AND LEMURS 



only observed this marmoset in the neighborhood of Para. On a certain occasion, 

 he observed one of these animals comfortably seated on the shoulders of a mulatto 

 girl, whom he met walking in Para ; and, on inquiry, learned that it had been cap- 

 tured in the island of Marajo, at the mouth of the Amazon. 



Another closely allied form from Brazil has been named the white-necked 

 marmoset (H. albicollis) , and is distinguished from the common form merely by 

 the circumstance that the hinder part of the head and the back of the neck are 

 gray instead of black. 



In Southeastern Brazil there is yet a third nearly related form, 



known as the black-eared marmoset (H, penicillata) , of which a 

 Marmoset 



representation is given in the right-hand figures of the illustration on 

 p. 189. The distinctive feature of this marmoset is to be found in the circum- 

 stance that, not only the whole of the head and neck, but likewise the tufts of long 

 hairs on the ears, are completely black. 



There are other varieties or species, differing somewhat from either of the above 

 in the coloration of the head and ears. 



The white-eared marmoset (//. aurita), which is likewise a Brazilian 

 White-Eared . - . , , . , , 



M rm t s P ecles > 1S th e representative of a second group, in which the pencil of 



hairs on the ears is much more slender than in the common marmoset, 



while the hair on the back is 

 generally somewhat speckled, al- 

 though faint traces of banding are 

 occasionally observable. The tail 

 is ringed like that of the common 

 marmoset. 



The general color of this 

 marmoset is blackish, minutely 

 speckled with yellow or a reddish 

 tint on the back ; the sides of the 

 head, the limbs, and the hinder 

 part of the body being pure black, 

 while the crown of the head is 

 brown, and a spot on the forehead, 

 as well as the tufts on the ears, 

 are gray. In some instances, 

 where the back is more decidedly 

 red than usual, there are faint, 

 paler cross-bands in this region, 

 and more especially on the loins. 



The white-shouldered mar- 

 moset {H. humeralifer) is a closely 

 THE SILVER MARMOSET. allied Brazilian form, distinguished 



by the face, shoulders, chest, and 



arms, as well as the tufts on the ears, being white ; the thighs being a mixture of 



brown and white in color. 



