APPENDIX 



d. Breast white or buffy, the sides and belly barred with black 

 (streaked with black in young). Back barred with blackish 

 plumbeous. 



Duck-Hawk 27 



2. Back brown, sometimes inclining to reddish or grayish. 



a. Tail bright rufous with one or more bars. 



a. Size, large. Top of head dark brown like back, or with 

 but a trace of rufous. 



Adult Western Red-tail 19 



b'. Size small. Top of head slaty blue enclosing patch of 

 rufous. 



Desert 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 pencilings 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 



c. 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. 



I. Upper tail-coverts more or less white. 



I . Upper tail-coverts pure white. Under parts light brown 

 streaked with dark brown. 



Young Marsh-Hawk 15 



[161] 



