Vernon M. Kleen of the Illinois Department of 
Conservation, and H. David Bohlen of the State Museum 
at Springfield. 
Virginia Engelhard of the Cornell University 
Laboratory of Ornithology kindly provided us with an 
audio spectrogram of an alder flycatcher song recorded 
in Illinois, and compared the Illinois record with records 
in the Cornell collection. 
Dr. Glen C. Sanderson provided valuable criticism of 
the original draft, and the final manuscript was edited by 
O. F. Glissendorf. 
EASTERN KINGBIRD (Tyrannus tyrannus) 
(Fig. 2 and 3) 
Spring Migration 
In tropical latitudes the migrations of ea 
kingbirds are often spectacular diurnal moven 
involving large flocks of birds (Skutch, in Bent 1 
Youngworth (1950) observed similar migration 
kingbirds in August in western Iowa, but the migrati 
this species has apparently never been witnesse 
Illinois. Both Cooke (1888) and Gault (1898) infi 
Fig. 2. — Eastern kingbird at its nest in a winged elm (Ulmus alata). Photo taken 5 miles north of Golconda in Pope County. 
