142 Lloyd's natural histury. 



ance of being double tipped ; it is widest in the middle of the 

 free portion. The proboscis is fully developed only at an ad- 

 vanced age in both sexes, being much shorter in the young, 

 and turned upwards. Vigors and Horsfield described their 

 N. reciirvus from a specimen which appeared to them to be 

 perfectly adult. The forehead is low; the eyes are wide 

 apart, and the neck is short and much dilated from the 

 presence of a very large laryngeal sac. Length of the body, 

 29^ inches; of the tail, 26 inches. 



Pemale. — Similar to the male, but it is smaller, and wants the 

 greyish rump markings ; while the proboscis is somewhat less 

 developed. 



Young. — Have the face blackish and the cheeks wrinkled; 

 the back of the head, down to the shoulders and upper part of 

 the fore-Kmb is dark reddish-brown. "Through a series of 

 changes during which the red-brown of the upper parts first 

 increases in strength, and the grey-brown of the hips and upper 

 side of the tail change to yellowish-white, the adult pelage is 

 reached." {Attderso?i.) 



This extraordinary animal presents all the structural char- 

 acters of the genus Sejnnopitheais ; but the lower border of the 

 nasal bones, forming the entrance to the nasal chamber, ex- 

 tends considerably below the lower border of the eye-sockets. 

 The facial portion of the skull does not much exceed the 

 brain-case. 



The Proboscis Monkey has the sacculated stomach already 

 described in the Langurs. 



Distribution. — The Proboscis Monkey is confined to the island 

 of Borneo. Mr. Hornaday found it along the west bank of the 

 Sarawak river, both near the sea and two miles below the 



