p:xplanation to plate ix. 



Pigs. 1, 2, 4. Archibuteo fei-rugineus, Lichtenstein. Ferruginous Kougli-lcgged Hawk. 



Figs. 3, 5. Aquila chrysaetos, Linnasus. Golden Eagle. 



Figs. 6, 8. it. Falco rusticolus gyrfalco, Linna-us. Gyrfalcon. 



Pig. 7. Haliaeetus leucocephalus, Linnaeus. Bald Eagle. 



432 



