U. S. NATIONAL MUSEUM 



BULLETIN 170 PLATE 10 



Adams County, Colo., June ly3S. 



Adult and young. 



Weld County, Colo., May 1931 A. M. Bailey and R. J. Niedrach. 



Courtesy Chicago Academy of Sciences and Colorado Museum of Natural History. 



Albino adult. 



Prairie Falcons. 



