542 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 TEGIONS......cccccecessseeeeeseeeesseeeenes 349. A. chrysaétos (Liny.). Golden Eagle. 
Genus THRASAETUS Garay. (Page 223, pl. 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 Rio Grande (and in Louisiana’). 
350. T. harpyia (Linn.). Harpy Eagle. 
Grnus HALIZEETUS Savieny. (Page 223, pl. LXXI,, 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 
ff. albicilla). 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- 
