When it is recognized that the hawks and owls are of more benefit 
than injury to man, they will be more earnestly studied and pro- 
tected. They are most abundant in the spring and fall when 
migrating. 
The American Ornithologists’ Union check list number precedes 
the scientific name. Conspicuous markings are printed in italics. 
The dimensions are taken by permission from Chapman’s “ Birds of 
Eastern North America.” The descriptions are from specimens in 
the Museum of Comparative Zoélogy at Cambridge and the Museum 
of the Boston Society of Natural History. The illustrations are 
from photographs taken expressly for the book by George Curtiss. 
I am greatly indebted to Herbert K. Job for reading the manuscript 
and for valuable information concerning the habits and notes of the 
birds. 
