EXPLANATION TO PLATE L 



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



Figs. ■ 2,3. Oreortyx pietus plvimiferus, Gould. Plumed Partridge. 



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



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



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



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



Fig. 15. Cyrtonyx montezumBe, Vigors. Massena Partridge. 



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



Figs. 20, 21, 22, 23. Deadragapus caaadensis, Linnaeus. Canada Grouse. 



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