Pee DUBON BULLE TIN 
Published Quarterly by the 
ipieeeNeOu seen U DU BON S-OIC TET Y 
ROOSEVELT RoAD and LAKE SHORE DRIVE, CHICAGO 5, ILL. 
Number 71 September, 1949 
Progress Report—Birds of Chicago 
By Epwarp R. Forp and PuHivip A. DUMONT 
A MANUSCRIPT for the new Birds of Chicago is nearly completed. This 
actually is a revision of the 1934 Birds of the Chicago Region by Edward 
R. Ford, Colin C. Sanborn, and C. Blair Coursen, published by the Chicago 
Academy of Sciences, but it has been improved in several ways. 
The nomenclature has been brought up to date and will follow the 
style of the next American Ornithologists’ Union check-list in its use of 
species’ names. Discussion of subspecific forms is presented in somewhat 
more detail when applicable. 
Full migration data have been provided by using the extensive William 
ROCKFORD — SEPTEMBER 18 
Members of the Illinois Audubon Society are invited to join 
the North Central Illinois Ornithological Society Sunday, Sept. 18, 
in a field trip along and near the Rock river at Rockford, Il. 
The fall migration of warblers and other passerines will be in full 
swing, and the many beauty spots in this area should provide an 
interesting list of birds at this time. 
The time is 10 a.m. The meeting place, yet to be selected, 
will be designated in a postcard notification to members as soon 
as all details of the trip have been decided. 
In addition to the prospect of an enjoyable outing and perhaps 
some new species for many, this trip offers an opportunity to get 
acquainted with other members from, we hope, a wide area within 
easy travel distance of Rockford, which is centrally located in the 
northern part of the state. Principal highway routes to Rock- 
tordwares Uso e20. U5. 0), and. Ill2. 
Dreuth records based on his many years of nearly daily observations of 
migrant birds in Lincoln Park. Average dates for arrival and departure 
are indicated, with early and late dates listed separately. It is expected to 
include a list of permanent residents, a calendar of the normal spring 
arrival dates, and a review of local breeding species. 
There are published notes, or dates in manuscript form, indicating that 
34 species and subspecies of birds have been found breeding in the Chicago 
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