650 



PATAGONIAN EXPEDITIONS : ZOOLOGY. 



subterminal bar is broader than the others; the terminal bar is lighter and 

 often shaded with buffy. 



Wings : Only the outer three primaries with inner webs distinctly emar- 

 ginate; uniform greyish brown throughout like the back; the feathers of 

 the shoulders often with paler margins. 



FIG. 331, 



\l I \ \ * 



k-i^wt 



Buteo swainsoni. Foot of adult male. Natural size. 



Lower parts : The chin and throat forming a white patch ; chest and 

 upper breast uniform bright rufous or cinnamon, making a distinct band ; 

 remainder of the lower parts buffy white, sometimes spotless, but gener- 

 erally barred and marked with rusty brown ; the under tail-coverts are usually 

 immaculate buffy white but are frequently faintly barred with rusty brown. 



Bill : Horn-blue, with a yellowish cere. 



Iris : Light pale brown. 



