228 NORTH AMERICAN BIRDS. 



bluish white, rarely faintly spotted with pale brownish. Sab. "Whole 

 of temperate North America, including greater part of Mexico* 



333. A. cooperi (Bonap.). Cooper's Hawk. 

 a*. Bare portion of tibia in front shorter than middle toe ; wing more than 12.00. 

 (Subgenus Astur Lacepede.) 



b 1 . Adult: Above, including whole back, clear bluish gray, or plumbeous, with 

 blackish shaft-streaks ; top of head deep black, the feathers pure white 

 beneath surface ; tail bluish gray, crossed by about four dusky bands, 

 these sometimes nearly obsolete on upper surface ; lower parts white, 

 the breast, belly, sides, and flanks thickly zigzagged or irregularly 

 barred with slaty grayish, the feathers, especially on breast, often with 

 dusky mesial streaks. Young : Above dusky grayish brown, more or less 

 spotted with pale buff or whitish, the feathers margined with buff, those 

 of head and neck edged or streaked with same ; tail light grayish brown, 

 narrowly tipped with white, and crossed by four distinct bands of dusky, 

 with a fifth, less, strongly marked, concealed by upper coverts ; lower 

 parts whitish, or pale buff, with distinct narrow stripes of blackish, these 

 more tear-shaped on belly, broader and more spot-like on sides and 

 flanks. Male: Length about 22.00, wing 12.00-13.25, tail 9.50-10.50, 

 tarsus 2.70-3,05. Female: Length about 24.50, wing 13.50-14.25, tail 

 11.50-12.75, tarsus 2.70-3.05. Nest in trees. Eggs 2-3, 2.31 X 1-74, 

 white, or glaucous-white, sometimes very faintly marked with pale 

 brownish. Sab. Northern and eastern North America, breeding chiefly 

 north of the United States, except in higher mountains ; west to and 

 including Bocky Mountains, where breeding as far south as Colorado. 



334. A. atricapillus (Wils.). American Goshawk. 



b*. Adult : Above dark plumbeous, the back inclining to sooty blackish ; other- 

 wise like A. atricapillus, but markings on lower parts much heavier, and 

 darker in tint. Young : Above brownish black, this color predomi- 

 nating largely over the lighter markings ; stripes on lower parts much 

 broader than in A. atricapillus, and deep black, the thighs with large, 

 often cordate, spots of the same. Eggs 2.34 X 1-79. Sab. Pacific coast, 

 north to Sitka, and breeding southward to at least 30° in Sierra Nevada. 

 334a. A. atricapillus striatulus Eidgw. Western Goshawk. 



Genus PARABUTEO Eibgwat. (Page 223, pi. LXYL, fig. 4.) 



Species. 



Common Characters.— Wing 11.65-14.60, tail 9.00-11.00, culmen 0.82-1.10, 

 tarsus 2.78-3.75, middle toe 1.52-2.00. Adult : Prevailing color dark chocolate- 

 brown, or sooty, sometimes uniform, sometimes varied by whitish or ochraceous 

 spotting; lesser wing-coverts, and tibiae, deep rufous; tail-coverts white; tail black, 

 with white base and tip. Young : Plumage greatly variegated. Above dusky 

 brown, the feathers edged with rusty, head and neck streaked with ochraceous ; 

 lpwer parts pale ochraceous, or buffy whitish, the breast and belly with longitudinal 



