Appendix, 



20. Red-bellied Hawk ; Buteo lineatus elegans 

 (Cass.). 



This is the western variety of the red-shouldered 

 hawk. Length of male eighteen, of female 

 twenty inches. The prevailing shade of the 

 adult is rich reddish brown, varied with dark 

 brown; the wings and tail are blackish brown, 

 varied with conspicuous white markings. The 

 rusty shade is most continuous and pronounced 

 on the shoulders and on the under parts, the 

 belly being generally barred with white. The 

 general color below is decidedly lighter than 

 above. The tail has several narrow, distinct 

 white bars. Immature birds are dark brown 

 above, with the head and lower parts white, 

 closely streaked with brown. This species ap- 

 pears to be resident chiefly in the interior 

 valleys of central and southern California. 



21. Swainson's Hawk; Buteo swain soni'^oxiz.-^. 



Length of male twenty, of female twenty-two 

 inches. Above dark brown, the forehead nar- 

 rowly edged with white at base of bill. Upper 

 tail-coverts white, barred with brown. Below 

 brown, the throat generally varying from pure 

 white to white finely lined with brown; belly 

 varying from white to creamy buff or chestnut, 

 with or without brown bars. This species is 

 often melanistic, that is with a very dark brown 

 plumage continuous above and below. An in- 

 habitant chiefly of the wooded valleys of the State. 



.22. American Rough-legged Hawk; Archibuteo 

 lagopus sancti-johannis (Gmel.). 



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