300 CO^YMBUS ARCTICUS. 



neck, there appear some violet-black feathers mixed with 

 white feathers ; the longitudinal streaked band of the sides 

 of the neck begins to form ; the streaks of the lower part of 

 the neck eqiially appear, and some black feathers, without 

 spots, appear on the back, rump, and sides. 



" At the age of tw'o years, the grey of the head and nape 

 become deeper, and assume a blackish tint, but only on the 

 forehead ; the violet-black of the throat and fore part of the 

 neck appear, but are variegated with some white feathers ; 

 the longitudinal bands are formed ; the feathers of the sides 

 and of the upper part of the back, the scapulars, and wing- 

 coverts assume the white bands and spots ; the upper man- 

 dible becomes blackish, but its base, as well as a portion of 

 the lower mandible, are still of a grey colour. 



"At the age of three years the plumage is perfect, although 

 it still happens that some individuals have the violet-black 

 of the neck sprinkled with some white feathers." 



