EXPLANATION TO PLATE VIII. 



Figs. 1, 2, 3, 4, 5, 6. Buteo swainsoni, Bonaparte. Swainson's Hawk. 



Fig. 7. Buteo brachyurus, Vieillot. Short-tailed Hawk. 



Figs. 8, 9. Urubitinga anthracina, Lichtenstein. Mexican Black Hawk. 



Figs. 10, 11, 12. Archibuteo lagopus sancti-johannis, Gmelin. American Rough-legged Hawk. 



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