EXPLANATION TO PLATE I. 



fig- 1. Colinus virginianus, Linnaeus. Bob White. 



Figs. 2, 3. Oreortyx pictus plumiferus, Gould. Plumed Partridge. 



Figs. 4, 5. Callipepla squamata, Vigors. Scaled Partridge. 



Figs. 6, 7. Callipepla squamata castanogastris, Brewster. Chestnut-bellied Scaled Partridge. 



Figs. 8, 9, 10. Callipepla californica, Shaw. California Partridge. 



Figs. 11, 12, 13, 14. Callipepla gambeli, Nuttall. Gambol's Partridge. 



Fi S- !"> Cyrtonyx montezumae, Vigors. Massena Partridge. 



Figs. 16, 17, 18, 19. Dendragapus obscurus fuliginosus, Ridgway. Sooty Grouse. 



Figs. 20, 21, 22, 23. Dendragapus canadensis, Linnaeus. Canada Grouse. 



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