2-12 NORTH AMERICAN BIRDS. 



speckled, spotted, blotched, or clouded with brown and purplish gray (rarely im- 

 maculate). Hab. Northern portions of northern hemisphere, chiefly in mountain- 

 ous regions 349. a. chrysaetos (Linn.). Golden Eagle. 



Genus THRASAETUS Gray. (Page 223, pi. LXX., fig. 1.) 



Species. 

 Adult: Prevailing color of upper parts, with chest, black, the upper parts 

 usually more or less mottled or marbled with gray; head and neck grayish, 

 darker on the crest, paler on throat ; tail broadly banded with black and mottled 

 ashy, the bands of the latter color about four in number ; lower parts, posterior to 

 chest, pure white, the thighs, and sometimes other portions, narrowly barred with 

 black. Young : Above light ash-gray, marbled with black, this forming about five 

 broken bands on middle tail-feathers, but confused on other rectrices; quills mottled 

 with dusky; head, neck, and entire lower parts white, the longer crest-feathers 

 and the chest tinged with ash-gray. Male : Wing about 21.00, tail 16.00, culmen 

 1.80, tarsus 4.50, middle toe 2.85, hind claw 2.25. Female: Length about 40.00, 

 extent about 7 feet, wing 24.50, tail 18.50, culmen 2.20, tarsus 5.00, middle toe 3.80, 

 hind claw 3.00. Hab. Tropical America in general, south to Bolivia and Paraguay, 

 north to Mexico, or, rarely, even to the mouth of the Eio Grande (and in Louisiana?). 



350. T. harpyia (Linn.). Harpy Eagle. 



Genus HALLffiETUS Savignt. (Page 223, pi. LXXL, fig. 1.) 



Species. 

 Common Characters. — Adults uniform dusky brown (the feathers with paler 

 margins), the tail white ; head and neck also white, or else much lighter colored 

 than body ; bill, cere, and feet deep yellow ; iris pale yellow (except sometimes in 

 H. albicilld). Young : Prevailing color dusky, mixed more or less with brown and 

 whitish, according to age ; bill and cere black ; iris deep brown. 



a}. Adult with head and neck light grayish brown, or brownish gray, and tail-coverts 

 dusky. Young with plumage largely light cinnamon-brown or isabella- color. 

 Adult: Head and neck light grayish brown, grayish fulvous, or brownish 

 gray, not abruptly lighter than the body ; tail white ; rest of plumage 

 dusky grayish brown (margins of feathers paler), the quills nearly black. 

 Young : Prevailing color above light umber-brown, cinnamon-brown, or 

 isabella-color, each feather with a median streak and terminal spot of 

 blackish brown; breast broadly striped with brownish black on a 

 brownish white and isabella-colored ground ; rest of lower parts nearly 

 plain dull isabella-brown, each feather with a median streak and ter- 

 minal spot of blackish, the thighs darker and more uniform. Downy 

 young : " Covered all over with dull sooty down, with long tufts of 

 whitish down shooting through . . . here and there." (Dresser.) 

 Male: Length 31.00-34.00, wing 23.00-26.00, tail 11.50-12.00, culmen 

 2.05-2.20, tarsus 3.30-3.80, middle toe 2.50-2.85. Female : Length 35.00- 

 40.00, wing 27.80-28.00, tail 14.00-16.00, culmen 2.20-2.45, tarsus 3.50- 



