236 
_—_— 
NORTH AMERICAN BIRDS. 
streaked with same. West on bushes or low trees, sometimes among 
rocks. Eggs 2-4, 2.23 x 1.73, white, dull glaucous white, or buffy 
white, usually more or less spotted with brown. Hab. Western 
North America, north to Alaska and western side of Hudson Bay, 
east to Wisconsin, Illinois, and Arkansas (casually to Massachusetts), 
and south through Middle America and greater part of South 
America to Argentine Republic. 
242. B. swainsoni Bonap. Swainson’s Hawk. 
ce. Wing less than 13.50. 
d', Middle toe longer than bare portion of tarsus in front. (Subgenus 
Buteola BoNAPARTE.) 
Adult: Above sooty blackish or blackish brown, the feathers 
of occiput pure white beneath surface, and the frontlet 
usually more or less conspicuously whitish; tail slaty 
grayish, varying to grayish brown, very narrowly tipped 
with white, and broadly banded with black, the black bands 
sometimes wider than the grayish interspaces, the latter 
5-7 in number. Young with tail more narrowly banded, 
the grayish brown bands usually broadest, and 8-9 in 
number. 
é. Lower parts black, or dark sooty brown, like the upper; young 
with feathers much spotted, beneath surface with white, 
the lower parts sometimes slightly varied with white and 
ochraceous, the under wing-coverts sometimes spotted with 
same. Male: Wing 11.20-11.70, tail 7.00-7.30, culmen 
.70—.75, tarsus 2.05-2.25, middle toe 1.35-1.40. Female: 
Wing 11.90-13.10, tail 7.50-8.00, culmen .78—.85, tarsus 
2.50-2.65, middle toe 1.50-1.60. Hab. Tropical America 
in general, except West Indies, north to northern Mexico 
and Florida. 
—. B. fuliginosus Scr. Little Black Hawk. 
é. Lower parts white. Adult male: Forehead, anterior portion 
of lores, fore-part of malar region, and lower parts gen- 
erally, immaculate pure white; sides of chest with a patch 
of rufous or cinnamon, the feathers with dusky shaft- 
streaks; wing 10.50-12.00, tail 6.00-7.00, culmen .68-.75, 
tarsus 2.05-2.30, middle toe 1.35-140. Adult female: Simi- 
lar to the male, but sides of chest grayish brown instead 
of rusty. Wing 12.70, tail 7.20, tarsus 2.30, middle toe 
1.55. Young: Above dull brownish, the scapulars, wing- 
coverts, etc., usually margined with buffy or light fulvous, 
the top and sides of head and neck streaked with same; 
1 Buteo fuliginosue Sci. P. Z. 8. 1858, 356, (Said to be the black phase of B. brachyurue ViErL1.) 
