EXPLANATION TO PLATE IV. 



Pigs. 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 californianus, Shaw. California Vulture. 



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



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



Figs. 8, 9. /i 'Maid ura macroura, Linnaeus. Mourning Dove. 



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