RAPTORES I FALCONID.E. 131 



wide band of white and several narrower bands near the 

 base. 



The California Hawk, B. Cooperi, Cass., of California, 

 is about the size of B. borealis, and may be distinguished 

 from all others of this genus in North America by its 

 brighter colors. 



The Genus Archibuteo is distinguished by tarsi densely 

 feathered to the toes, but more or less naked behind, and 

 covered with scales ; wings long and wide, tail rather 

 short and wide, and toes short. 



The Rough-legged Hawk, A. lagopus, Gray, of tem- 

 perate North America and Europe, is twenty-one to 

 twenty-three inches long, the wing sixteen to seventeen 

 inches ; the male nineteen inches, and the wing fifteen 

 to sixteen inches. The plumage is irregularly variegated 

 with dark or light brown and white or whitish. It is one 

 of the most widely diffused of all birds ; rather sluggish 

 in its habits, flies low, and frequents low grounds, where 

 it sits for hours watching for birds and small quadrupeds. 



The Black Hawk, A. sancti-johannis, Gray, of Eastern 

 and Northern North America, is twenty-two to twenty- 

 four inches long, the wing seventeen to seventeen and a 

 half inches ; the male twenty to twenty-two inches, the 

 wing sixteen to sixteen and a half inches. The plumage 

 is glossy black, with a brownish tinge. The tail has one 

 transverse band of white, and is irregularly marked to- 

 wards the base with the same color. Some specimens 

 are dark chocolate-brown, with the head striped with yel- 

 lowish-white and reddish-yellow ; and the tail with several 

 irregular transverse bands of white. 



The California Squirrel Hawk, A. ferrugineus, Gray, 

 of Western North America, is somewhat larger than 

 either of the two preceding ; the upper parts dark brown 

 and light rufous ; the under parts of the body white, 

 with narrow longitudinal lines and spots on the breast 



