Introduction 
THE following list of migration dates has been com- 
piled entirely from the lists of Messrs. Locke L. 
Mackenzie, Sydney Stein and ourselves. These lists 
cover the spring migration for the eight years 1913-1920. 
and include the earliest date for each bird each year. 
All specimens were either taken or clearly seen, and 
the list should contain some valuable dates. No bird, 
not actually seen by one of the above mentioned has been 
included. 
By the words Chicago Area, we mean that portion 
of the country lying within a radius of thirty miles from 
the city itself. This region includes several excellent 
stations for observation, such as Miller, ,Ind., Hinsdale, 
Argo, Riverside, Highland Park, and Hyde Lake, 111., and 
the city parks, a diversified region containing lakes, 
woods, swamps, and rivers. The list contains two hun- 
dred and twenty-seven species seen in this area, five seen 
only in the fall migration, and five sub-species whose oc- 
currence in our area is doubtful. This totals two hun- 
dred and thirty-seven species and sub-species. The names 
used are those given in the 1910 A. O. U. check list. 
We wish to express our sincere thanks and gratitude 
to Messrs. H. K. Coale, Locke Mackenzie, and Sydney 
Stein, whose kind co-operation has made the work pos- 
sible. 
THE AUTHORS. 
