EXPLANATION TO PLATE VIII. 



Buteo swainsoni, Bonaparte. Swainson's Hawk. 



Buteo brachyurus, Vieillot. Short-tailed Hawk. 



Urubitlnga anthracina, Lichtenstein. Mexican Black Hawk. 



Arcliibuteo lagopus sancti-johannis, Gmelin. American Rough-legged Hawk. 



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