EXPLANATION TO PLATE IV. 



Figs. 1, 3. Carthai'tes aura, Linnceus. Turkey Vulture. 



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



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



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



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



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



Figs. 8, 9. Zenaidura macroura. Linna;us. Mourning Dove. 



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