ILLUSTRATIONS. 



Page. 



PLATE. 



Platk I. ]\Iap .showing l)rt'eiliiig range of the bolxiliiik (JJulichony.v onjzivortu<) . 



Frontispiece. 

 TEXT FIGURES. 



Fig. 1. Bobolink 12 



2. Diagram illustrating proportions of food elements of bobolink 19 



:i Diagram illustrating proportions of food elements of cowbird 25 



4. Ked-winged blackbird 34 



5. Diagram illu.strating proportions of food eK'mi'ut.s (if ri'dwing 38 



6. Crow blackbird 53 



