28 THE AUDUBON BULLETIN 



autumn migrants left us again for the south. In the spring migration, the 

 greatest number of new arrivals and the longest lists of birds seen on a 

 single trip are usually recorded early in May or, less frequently, in the 

 last week in April. 



A knowledge of the locations of the winter homes of the different 

 kinds of birds helps us to understand some things which might otherwise 

 be quite puzzling. It helps explain why the hermit thrushes arrive in 

 Illinois three weeks earlier than other kinds of thrushes; why the phoebes 

 arrive five or six weeks before other kinds of flycatchers; and why the 

 myrtle warblers can greet us several weeks before many other kinds of 

 warblers have the opportunity. Illinois hermit thrushes pass the winter 

 in the states situated between Illinois and the Gulf of Mexico, while the 

 other thrushes winter in Central or South America. The Illinois phoebes 

 in winter occupy about the same territory as do the hermit thrushes though 

 some phoebes range through a considerable part of Mexico. The other 

 kinds of flycatchers winter in Central or South America. Many myrtle 

 warblers are found in winter in the same regions as the phoebes, although 

 some go still farther into Central America. Most other kinds of warblers 

 winter south of the United States and chiefly in Central and South 

 America; but a few kinds, like the palm warblers, winter in the West 

 Indies, and the pine warblers have their wnter home in the United States 

 along with the myrtle warblers. When the spring migration begins, the 

 hermit thrushes, phoebes, and myrtle warblers have but very short journeys 

 to make before arriving in Illinois. The following list shows data on 

 times of arrival and on the location of the winter homes of a consid- 

 erable number of the species mentioned above. The date given with each 

 species is the average of the earliest dates of each of the years 1903-1920 

 on which that particular species was seen in the vicinity of Urbana Illinois. 



Data on first records of certain kinds of birds at Urbana, Illinois: 



Thrushes. Winter homes. ' 



Hermit thrush South, half of U. S. 



Olive-backed thrush Cent, and So. Am. 



Gray-cheeked thrush So. Am. 



Wood thrush Cent. Am. 



Wilson's thrush So. Am. 



Flycatchers. 



Phoebe South, half U. S. 



Kingbird Cent, and So. Am. 



Crested flycatcher Cent. Am. 



Least flycatcher Mex. to So. Am. 



Olive-sided flycatcher So. Am. 



Acadian flycatcher • So. Am. 



Yellow-bellied flycatcher Cent. Am. 



Warblers. 



Myrtle warbler South, half U. S. 



Palm warbler W. I. 



Pine warbler South states 



Black and White warbler W. I. & Cent. Am. 



Ovenbird Fla. and ' W. I. 



Magnolia warbler Cent. Am 



Cape May warbler W. I. 



Black-polled warbler So. Am, 



Canada warbler So. Am. 



Av. date 



Number 



1st record 



years 



April 1 



17 



April 24 



18 



April 29 



17 



April 28 



18 



April 30 



17 



Mar. 19 



18 



April 27 



18 



May 1. 



18 



May 2 



18 



May 11 



17 



May 12 



16 



May 14 



16 



April 3 



17 



April 22 



18 



April 22 



17 



April 24 



18 



April 30 



18 



May 1 



18 



May 4 



18 



May 6 



17 



May 10 



16 



