. The birds of Illinois and Wisconsin . Illinois and Wisconsin — Cory 523 Adult female: Similar, but outer tail feathers narrowly tipped withtawny, and throat band, pale buff instead of white. Length, ; wing, ; bill, .35; tail, The Whip-poor-will is a summer resident in Illinois and Wisconsin,where its familiar note is often heard, although the bird itself is rarelyseen on account of its nocturnal habits. It usually arrives from thesouth late in April and nidification commences early in May. The eggs are two in number, deposited on the ground. They aregrayish white, faintly washe
. The birds of Illinois and Wisconsin . Illinois and Wisconsin — Cory 523 Adult female: Similar, but outer tail feathers narrowly tipped withtawny, and throat band, pale buff instead of white. Length, ; wing, ; bill, .35; tail, The Whip-poor-will is a summer resident in Illinois and Wisconsin,where its familiar note is often heard, although the bird itself is rarelyseen on account of its nocturnal habits. It usually arrives from thesouth late in April and nidification commences early in May. The eggs are two in number, deposited on the ground. They aregrayish white, faintly washed in places with pale lilac and showinga few pale brown spots. They measure about x .85 inches. Genus CHORDEILES Chordeiles virginianus (Gmel.). NiGHTHAWK. Distr.: Eastern North America, west to the Great Plains, andfrom Labrador to the Gulf of Mexico; south to Argentine Republic inwinter. Adult male: Upper plumage, black, mottled more or less on theback 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 wingband when flying); tail, brownish black, more or less marked withbuff and with a broad subterminal, imperfect band of white. 524 Field Museum of Natural History — Zoology, Vol. IX. Adult female: Similar, but without white tail band, and the throat,tawny instead of white. Length, about 9; wing, 8; tail, ; bill, .25. The Nighthawk is a common summer resident throughout Illi-nois and Wisconsin, arriving in May and leaving again in soon as the sun goes down, it may be observed flying about inpursuit of insects, uttering at frequent intervals a loud, harsh peet, the cry being immediately preceded by two or three hurried strokesof the wings. During the mating season the male makes a peculiarbooming sound preceded by a downward
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