192 



APES AND MONKEYS. 



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 

 grey instead of black. 



Black-Eared In South-Eastern Brazil there is yet a third nearly related form, 



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

 representation is given in the right-hand figures of the illustration on page 189, 

 The distinctive feature of this marmoset is to be found in the circumstance 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. 



White-Eared The white-eared marmoset (H. aurita), which is likewise a 



Marmoset. Brazilian species, is the 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 colour 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 grey. 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 colour. 



With the silver marmoset of Brazil (H. chrysoleucus) we come 

 to the first of three species, distinguished from those yet noticed 

 either by the absence of rings of colour on the tail, or by the arrangement or 

 absence of the longer hairs on the ears. They are all tiny little creatures, not 

 much larger than a rat, and have no bands of colour on the back. 



Silver Marmoset. 



