Appendix. 



b\ Size Small. Top of head slaty blue 

 enclosing patch of rufous. 



American Sparrow-Hawk 29 



b. Tail dark brown, conspicuously barred 

 with white. 



a' . Size moderately large. Breast white, 

 heavily streaked and barred with 

 brown. Throat dark. 



Young Red-bellied Hawk 20 



b\ Size small. Length 11 to 13 inches. 



Throat pure white or with faint pencil- 



ings of dusky. White bars of tail 



narrow. 



Young Pigeon-Hawk . 28 



c. Tail grayish brown, broadly barred 

 with dark brown. 



a! . Tail square, size averaging small. 



Young Sharp-shinned Hawk 16 

 b' . Tail rounded, size averaging larger. 



Young Cooper's Hawk . 17 



d. Tail grayish brown, rather indistinctly 

 barred with buff. Throat white or 

 buff with a broad line of blackish at 

 sides. 



Young Duck-Hawk , 27 



e. Tail grayish brown, faintly barred with 

 buff. Distinct dark lines on sides of 

 white throat. White breast streaked 

 and dotted with brown. Back generally 

 grayish brown. 



Prairie-Falcon . . 26 



C. Under parts wholly brown or with a solid 

 patch of dark brown on breast or belly. 



272 



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