ILLUSTRATIONS 



FACING 

 PAGE 



XXII. WAGLER'S OROPENDOLA. MALE 

 (Left), FEMALE (Right). 

 Zarhynchus w. wagleri . 424 



XXIII. BIOLOGICAL STATION ON BARRO 



COLORADO ISLAND SHOWING 

 THE VIRGIN TROPICAL FOREST 434 



Photograph by Dr. Alfred O. Gross. 



XXIV. BARRO COLORADO ISLAND 



HABITAT GROUP . . . 444 



Courtesy American Museum Natural 

 History. 



FIGURES IN THE TEXT 



PAGE 



1. Map of the Panama Canal Zone ix 



2. Diagram of a Bird . . . . 21 



3. Crypturus soui panamensis (Pileated 



Tinamou) . . . . 24 



4. Ortalis c. cinereiceps (Gray-headed 



Guan) 28 



5. Odontophorus guianensis panamensis 



(Marbled Guiana Quail), head . 30 



6. Columba speciosa (Scaled Pigeon), 



head . . . . '.. 32 



7. Aramides c. cajanea (Cayenne Wood 



Rail) . . . . t 4 2 



8. Heliornis fulica (American Finfoot) . 45 



