EXPLANATION TO PLATE IV. 



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



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



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



Fig. 5. Pseudogryphus californianus. Shaw. California Vulture. 



Fig. (i. Ectopistes migratorius, Linnaeus. Passenger Pigeon. 



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



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



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