236 NORTH AMERICAN BIRDS. 



streaked with same. Kest on bushes or low trees, sometimes among 

 rocks. Eijgs 2-4, 2.23 X 1-73, white, dull glaucous white, or buflfy 

 white, usually more or less spotted with browii. Hub. Western 

 North America, north to Alaska and western side of Hudson Baj-, 

 east to Wisconsin, Illinois, and Arkansas (casually to Massachusetts), 

 and south through Middle America and greater part of South 

 America to Argentine Eepublic. 



242. B. sv/ainsoni Bonap. Swainson'j Hawk, 

 c'. Wing less than 13.50. 



<i'. 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 graj-ish interspaces, the latter 

 5-7 in number. Young with tail more narrowly banded, 

 the grayish brown bands usually broadest, and 8-0 in 

 number, 

 e". 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 too 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. Ilab. Tropical America 

 in general, except West Indies, north to northern Mexico 

 and Florida. 



— . B. fuliginosus Scl. Little Black Hawk.' 

 e'. 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 0.00-7.00, culmen .68-.75, 

 tarsus 2.05-2.30, middle toe 1.35-1.40. 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 scajjulars, wing- 

 coverts, etc., usually margined with buffy or light fulvous, 

 the top and sides of head and neck streaked with same; 



1 Jiuteo /uliyinoeui ScL. P. Z. S. 1858, 356. (Said to bo the black pbuo of £, brachi/urue Vieili..) 



