AVES FALCONID/E. 



651 



Feet and legs : Yellowish, with olive shading. 



Adult female: Very much like the adult male, but with less white on 

 the forehead ; the chest band greyish brown instead of cinnamon and con- 

 color with the back ; all the colors duller or deeper. Notably larger in 

 size. Length 22.00; wing 17.00 inches. 



Fig. 332. 



Butco szvainsoni. 



Adult female. About one-fourth natural size, 

 in the American Museum. 



From a bird 



Adult melanistic plumage ; either sex : Whole plumage uniform dusky ; 

 the tail dusky with deeper bars, nine or ten crossing the subterminal one 

 being broader than the others ; in very dark individuals this is obsolete. 



There is every possible gradation between this phase, which in its purest 

 form is uncommon, to the normal adult dress. 



Young of the year and immature birds : Above deep brown, the feathers 

 margined and tipped with buffy brown ; the head lighter, with a distinct 

 supraciliary buffy line ; the throat whitish and the rest of the lower parts 

 buffy, deep in tone and splashed or marked with brown, nearly black ; the 

 tail is much as in the normal adult ; the upper tail-coverts barred broadly 



