228 NORTH AMERICAN BIRDS. 
bluish white, rarely faintly spotted with pale brownish. Hab. Whole 
of temperate North America, including greater part of Mexico. 
333. A. cooperi (Bonap.). Cooper’s Hawk. 
a*, Bare portion of tarsus in front shorter than middle toe; wing more than 12.00. 
(Subgenus Astur Lac&PEpE.) 
b. 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. West in trees. Eggs 2-5, 2.32 x 1.79, 
white, or glaucous-white, sometimes very faintly marked with pale 
brownish. Hab. Northern and eastern North America, breeding 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 (Wizs.). American Goshawk. 
b. Adult: Above dark plumbeous, the back inclining to sooty blackish; other- 
wise like A. atricapittus, 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 2.36 x 1.79. Hab, Pacific coast, 
north to Sitka, and breeding southward to at least 39° in Sierra Nevada. 
334a. A. atricapillus striatulus Ripew. Western Goshawk. 
Genus PARABUTEO Ripeway. (Page 223, pl. LXVI.,, 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 tibia, 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 
