EXPLANATION TO PLATE I. 



Fig. 1. Colinus virginianus, Linnceus. Bob White. 



Pigs. 2, 3. Oreortyx piotus plumiferus, Gould. Plumed Partridge. 



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



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



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



Pigs. 11, 12, 13, 14. Callipepla gambeli, Nuttall. Gambel's Partridge. 



Pig. 15. Cyrtonyx montezumse, Vigors. Massena Partridge. 



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



Pigs. 20, 21, 22, 23. Dendragapus canadensis, Linnseus. Canada Grouse. 



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