228 NORTH AMERICAN BIRDS. 



bluish white, rarely faintly spotted with pale brownish. Hah. "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.) 



6\ Adult : Above, including whole back, clear bluish graj", 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 bellj^, 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. Hah. Northern and eastern North America, bi'eeding chiefly 

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

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



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



h"^. 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. Hah. Pacific coast, 

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

 334r?. A. atricapillus striatulus Eidgw. Western Goshawk. 



Genus PARABUTEO Eidgw ay. (Page 223, pi. LXYI., 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. Adidt : Prevailing color dark chocolate- 

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

 spotting; lesser wing-coverts, and tibise, 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 ; 

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



