EXPLANATION TO PLATE IV. 



Figs. 1. 2. CorvTis corax sinuatus, Wagler. American Raven. 



Fig. 3. Corvus corax principalis, Ridgway. Northern Raven. 



Figs. 4, 5, 6, 7. Corvtis cryptoleucus, Concli. "White-necked Raven. 



Figs. 8, 9, 10, 11, 13. Corvus americanus, Anduhon. American Crow.' 

 Figs. 13, 14. Corvus americanus floridanus, Baird. Florida Crow. 



Fig. 15. Corvus caurinus, Baird. Northwest Crow. 



Figs. Id, 17. Corvus ossifragus, Wilson. Fish Crow. 



'Figs. 31, 32. Corvus americanus, Audubon. See Plate T. 



