152 ZOOLOGICAL GAIIDE^>. 



directly the reverse of that which is observed in ahiiost 

 every others pecies of Raptorial Birds. All of these, 

 and especially the Eagles, exhibit an obvious tendency 

 to assume a lighter plumage as they advance in years. 



It is true that the white band of the tail, which in 

 the youngest individuals occupies full three-fourths of 

 that member, is gradually eflaced by the extension of 

 the dusky or blackish brown of its tip, and remains 

 afterwards only in the shape of a few irregular indis- 

 tinct wavy bands ; but in the Society's specimen the 

 general colour, far from being lighter in the young bird, 

 is of a deep brown approaching to black, the head and 

 back of the neck being alone of a lighter brown. That 

 this bird is extremely young is proved by the extent of 

 the white band on its tail, which reaches nearly to the 

 tip, and by the grayish white of the inner sides of the 

 legs. In these respects alone, in its darker plumage, 

 and its somewhat more dusky iris, does it differ from 

 the birds of the preceding article. 



The specimen figured was brought from Hudson's 

 Bay in the autumn of 1829, and was presented by the 

 Hudson's Bay Company to the Society. It affords an 

 interesting point of comparison with the Golden Eagles 

 previously confined in the Menagerie. 



