EXPLANATION TO PLATE IV. 



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



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



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



Fig. 5. Pseudogryphus calif ornianus, Shaw. California Vulture. 



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



Pig"s. 7,10. Catharista atrata, Bartram. Black Vulture. 



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



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