S6 



sides of the breast and the belly ; in the adult the white extends 

 some distance above the eye, and the neck and whole of the 

 under surface are pure white. The upper plumage, likewise, 

 differs in the young, in being dark brown, with the head and 

 hind neck feathers edged rusty, and the back and scapular 

 feathers margined with rusty grey, whereas in the adult the 

 upper surface is shining black. A further stage in the immature 

 garb consists in the yellow disappearing to a considerable 

 extent from the neck and chest, being conspicuous only on the 

 breast ; the upper surface becomes darker, and the grey lustre 

 on the scapular and tertial feathers more noticeable. 



