YACOU GUAN. 181 



the present species ; which in its perfect state is 

 thus distinguished from the others of this division 

 of the genus : it is eight and twenty or thirty 

 inches in length : the forehead of the male has a 

 small black space : the long acuminated feathers 

 on the head and the occiput are white, with their 

 shafts black or brown : on each side of the head is 

 a broad white stripe, which is prolonged to the 

 top of the neck : the greater and middle wing- 

 coverts are black, with white spots : the feathers 

 of the breast have a narrow white band on the 

 exterior part of each web : the rest of the plumage 

 is of a fine black, with purple and violet reflections : 

 the tail possesses a green hue : on each cheek is a 

 small naked space, communicating with the cere at 

 the base of the beak ; it is of a bluish white : the 

 naked skin on the throat is red, and it has a kind 

 of wattle of a fine blue : the irides are rufous : 

 the legs and tarsi are red, changing to a dull 

 black by age : the claws are brown : the beak 

 dusky at the tip, and blue at the base. The female 

 is known by being smaller : the feathers of the 

 crest are dull white, and more varied with brown 

 or dusky: the reflections on the plumage are less 

 brilliant. The young before their first moult 

 have their plumage black, with a tinge of brown 

 and chesnut, which colour is most conspicuous on 

 the rump, the thighs, and the abdomen : the irides 

 are brown : the naked space on the cheeks is of 

 a livid colour, and the feathers of the crest are 

 varied with brown. 



This is subject to considerable variety: one 



