Appendix, 



I. Upper tail-coverts more or less white. 



1. Upper tail-coverts pure white. Under 

 parts light brown streaked with dark 

 brown. 



Young Marsh-Hawk . . 15 



2. Upper tail-coverts white, barred with 

 brown, or largely brown barred with 

 white. 



a. Throat white, often streaked wnth 

 brown; breast solid brown; tail dis- 

 tinctly barred with brown. 



Adult Swainson's Hawk . 21 



b. Upper tail-coverts varied with rusty 

 brown. Above and below dark brown 

 varied wath rusty. Tail white and 

 gray with bars absent or indistinct. 

 Feet feathered to toes. 



Dark phase of Ferruginous Rough- 

 leg . . . . 23 



c. Above dark brown varied with rusty; 

 below light rufous, belly barred with 

 white; throat darker brown. Wings 

 and tail conspicuously barred with white. 



Adult Red-bellied Hawk . 20 



d. Above dark brown varied with rusty; 

 below white, heavily streaked and 

 spotted with brown, the belly solid 

 brown. Feet feathered to toes. 



Dght phase of American Rough-leg 22 



II. No white on upper tail- coverts. 

 I. Size very large (nearly 3 feet). 



a. Feet completely feathered; head always 

 dark. 



Golden Eagle ... 24 



