JAN., 1909. BIRDS OF ILLINOIS AND WISCONSIN CORY. 



523 



Adult female: Similar, but outer tail feathers narrowly tipped with 

 tawny, and throat band, pale buff instead of white. 



Length, 9.50; wing, 6.10; bill, .35; tail, 4.75. 



The Whip-poor-will is a summer resident in Illinois and Wisconsin, 

 where its familiar note is often heard, although the bird itself is rarely 

 seen on account of its nocturnal habits. It usually arrives from the 

 south late in April and nidification commences early in May. 



The eggs are two in number, deposited on the ground. They are 

 grayish white, faintly washed in places with pale lilac and showing 

 a few pale brown spots. They measure about 1.20 x .85 inches. 



Genus CHORDEILES Swainson. 

 200. Chordeiles virginianus (GMEL.). 



NlGHTHAWK. 



Distr.: Eastern North America, west to the Great Plains, and 

 from Labrador to the Gulf of Mexico ; south to Argentine Republic in 

 winter. 



Adult male: Upper plumage, black, mottled more or less on the 

 back with pale rufous, and on the wing coverts with gray and buffy 



Nighthawk. 



white; throat, white; breast, blackish, marked with pale rufous; 

 belly, barred with black and white, and tinged with buff; primaries, 

 blackish, with a single broad white bar (forming a conspicuous wing 

 band when flying) ; tail, brownish black, more or less marked with 

 buff and, with a broad subterminal, imperfect band of white. 



