EXPLANATION TO PLATE I. 



Fig. 1. 



Figs. 2, 3. 



Figs. 4, 5. 



Figs. 6, 7. 



Figs. 8, 9, 10. 

 Figs. 11, 12, 13,14. 

 Fig. 15. 



Figs. 16, 17, 18, 19. 

 Figs. 20, 21, 22, 23. 



Colinus virginianus, Linnceus. Bob White. 



Oreortyx pictus plumiferus, Gould. Plumed Partridge. 



Callipepla squamata, Vigors. Scaled Partridge. 



Callipepla squamata castanogastris, Brewster. Chestnut-bullied Scaled Partridge. 



Callipepla californica. Shaw. California Partridge. 



Callipepla gambeli, Nuttall. Gambel's Partridge. 



Cyrtonyx montezumae. Vigors. Massena Partridge. 



Dendragapus obscurus fuliginosus, Ridgway. Sooty Grouse. 



Dendragapus canadensis, Linnaeus. Canada Grouse. 



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