EXPLANATION TO PLATE I. 



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



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



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



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



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



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



Fig. 15. Cyrtonyx montezumae, "Vigors. Massena Partridge. 



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



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



416 



