EXPLANATION TO PLATE IV. 



Figs. 1, 3. Carthartes aura, Linnaeus. Turkey Vulture. 



Fig. 2. Columba flavirostris, "Wagler, Red-billed Pigeon. 



Fig. 4. Columba leucocephala, Linnaeus. White-crowned Pigeon. 



Fig. 5. Pseudogryphus calif or nianus, Shaw. California Vulture. 



Fig. 6. Eetopistes migratorius, Linnaeus. Passenger Pigeon. 



Figs. 7, 10. Catharista atrata, Bartram. Black Vulture. 



Figs. 8, 9. Zenaidura macroura, Linnaeus. Mourning Dove. 



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