APES AND MONKEYS. 
192 
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. auritcc), 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 (IT. 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. 
