EXPLANATION TO PLATE VI. 



Pig-. 1. Accipiter atricapillus, Wilson. American Goshawk. 



Pig. 2. Accipiter atricapillus striatulua, Ridgway. Western Goshawk. 



Pigs. 3, 4. Parabuteo unicinctus harrisi, Audubon. Harris's Hawk. 



Pigs. 5, 6. Buteo borealis, Gmelin. Red-tailed Hawk. 



Pigs. 7, 8. Buteo borealis calurus, Cassin. Western red-tailed Hawk. 



Pig. 9. Buteo lineatus elegans, Gassin. Red-bellied Hawk. 



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