NATURAL HISTORY. 
As has already been noticed, the tail differs in length in different members or species of this genus, 
and consequently it has been divided into a long-tailed and a short-tailed set. The Monkey just 
mentioned belongs to the long-tailed series, as does also the following : — 
THE COUXIO * 
This Saki has a beard under its chin, and the fur is generally of a brown-black in the male, and 
brown in the female. It has a fine fiery tail, and a very human aspect. The name is by no means 
satisfactory, especially as by a curious mistake the young ones have been called “ Israelites.” 
THE PARAUACU — THE HAIRY SAKI.f 
Bates gives the following description of this Monkey, whose habits he studied on the Upper 
Amazon, at Ega : — “ One of the Ega Monkeys is called the Parauacu, and is a timid, inoffensive 
creature, with a long bear-like coat of harsh speckled-grey hair. The long fur hangs over the head, 
half concealing the pleasing, diminutive face, and clothes also the tail to the tip, which member is well 
developed, being eighteen inches in length, or longer than the body. The Parauacu is a very delicate 
animal, rarely living many weeks in captivity ; but any one who succeeds in keeping it alive for a 
month or two gains by it a most affectionate pet. One of the specimens 
of Pithecia albicans — which is only a variety of this species — now hi the 
British Museum was, when living, the property of a young Frenchman, a 
neighbour of mine at Ega. It became so tame in the course of a few 
weeks that it followed him about the streets like a Dog. My friend was 
a tailor, and the little pet used to spend the greater part of the day seated 
on his shoulder, whilst lie was at work on his board. It showed, never- 
theless, great dislike to strangers, and was not on good terms with any 
other member of my friend’s household than himself. I saw no Monkey 
that showed so strong a personal attachment as this gentle, timid, silent 
little creature. The eager and passionate Cebi seem to take the lead of 
all the South American Monkeys in intelligence and docility, and the 
Coaita has perhaps the most gentle and impressible disposition; but the 
Parauacu, although a dull, cheerless animal, excels all in this quality of 
-D-tVAi.^ \JX .O'HJi’l-A., ° 
.(From the Proceedings of the Zoological capability of attachment to man. It is not wanting, however, in in tell i- 
Society.) gence as well as moral goodness, proof of which was furnished one day 
by an act of our little pet. My neighbour had quitted his house in the 
morning without taking the Parauacu with him, and the little creature having missed its friend, and 
concluded, as it seemed, that he would be sure to come to me, both being in the habit of paying me 
4 i visit daily together, came straight to my dwelling, taking a short cut over gardens, trees, and thickets, 
instead of going the roundabout way of the street. It had never done this before, and we knew the 
route it had taken only from a neighbour having watched its movements. On arriving at my house 
and not finding its master, it climbed to the top of my table, and sat with an air of quiet resignation 
waiting for him. Shortly afterwards my friend entered, and the gladdened pet then jumped to its 
usual perch — on his shoulder.” 
THE MONK + 
This Monkey is introduced here with a view of explaining the general characteristics of the brain 
-of the group. 
The brain of one of these Monkeys weighed 460 grains, or the one-eighteenth part of an entire 
but emaciated body. The general form is a regular arch, and the cerebellum is covered by the brain 
proper. Its general form is like that of some of the Cebi, and is less pointed than that of the Old 
World Apes in front, and less elongated and depressed than those of the lowest Monkeys of the 
New World, such as the marmosets and Tamarins, for instance. 
Pithecia Satanas. 
t Pithecia hirsuta. 
J Pithecia monachus. 
