ON THE UAKARI MONKEYS. 107 



The face, chin, and sides of the head, as far as the ears, are nearly 

 naked, with only a scanty covering of hairs. The nose and the interval 

 between the eyes (measuring ^ inch) are very- nearly bare, there being 

 here only a very few most minute hairs, only seen in a side light. 

 Along the superciliary ridges are a few long, forwardly directed, black 

 hairs, white at the base, and slightly curved forwards. There are a few 

 similar hairs also on each side of the face between the nostrils and the 

 angle of the mouth, as well as on the chin. 



The muzzle, which is somewhat truncated, and the chin are sparsely 

 covered with short bristly white hairs, directed more or less downwards 

 aud forwards. 



The naked skin of the sides of the head was in life flesh-colour, the 

 naked ears being slightly redder. The face and muzzle were, as will be 

 seen from Mr. Wolf's sketch (Plate IV.), during life bright vermilion- 

 red, so red, indeed, as to give the animal the appearance of being painted ; 

 but the amount of this bright red varied much from time to time, depen- 

 ding, apparently, both on the animal's health and on its emotions. Mr. 

 Bartlett tells me he has seen the animal flush up, as it were, in a P. Z.S. 1880, 

 moment a brilliant red all over the naked parts of its face, and as soon P- 629 - 

 become pale again when the disturbing cause had subsided. After death 

 the brilliant red colour was confined to the region of the nasal openings 

 and the interval between them and the upper lip *. The eyelashes are 

 represented only by very fine silky minute hairs. The irides were light 

 hazel-brown, the sclerotic white. These points may be well seen in 

 the accompanying figure of the head (Plate V.), of the natural size, 

 drawn soon after death by Mr. Smitf. The ears are of a somewhat 

 squared shape much more so thaii in a specimen of Pitkecia satanas I 

 was able soon afterwards to examine in the flesh with the angles 

 rounded off. There is no lobule ; and both tragus and antitragus are 

 little developed. The helix has a small recurved flap above, lying over 

 the top of the helical fossa. They are quite naked. At a point about 

 corresponding with the top of the occiput there is a parting of the hairs 

 of the head, these radiating forwards, outwards, and backwards from this 

 point the long red hair which covers the sides of the head, passes over 

 and behind the ears, passing outwards and then forwards, whilst the 

 hairs of the back of the head and neck pass backwards. The short silky 

 grey and \vhite hairs covering the top of the head pass directly forwards. 

 These are very fine, and closely appressed to the scalp ; white for the 

 greater part of their length, they become black at the tips ; towards the 

 sides and front of the scalp they become tinged with reddish, so 



* Of. Bates, ' Naturalist on the Amazons,' ii. p. 310. 



t In this figure the extent of the red colour of the face has been restored, partly 

 from memory and notes taken from the living animal, and partly from the sketch 

 m ide bv Mr. Wolf. 



