. The birds of Illinois and Wisconsin . Least Bittern. Jan., 1909. Birds of Illinois and Wisconsin—Cory. 79 Under parts and sides of the head and throat, buff white; a blackpatch on sides of the breast. Ixobrychus exilis. Least Bittern. See No. 80. Under parts and sides of the head and throat, rufous chestnut; under tail coverts, dull black. Ixobrychus iieoxemts. Corys Least Bittern. See No. 81. * GROUP 2. Wing, 6 to inches Crown, greenish or greenish black; legs, orange yellow in life. Butorides Heron. See No. 87. * GROUP 3. Wing, to 11 inches long. Greater pa
. The birds of Illinois and Wisconsin . Least Bittern. Jan., 1909. Birds of Illinois and Wisconsin—Cory. 79 Under parts and sides of the head and throat, buff white; a blackpatch on sides of the breast. Ixobrychus exilis. Least Bittern. See No. 80. Under parts and sides of the head and throat, rufous chestnut; under tail coverts, dull black. Ixobrychus iieoxemts. Corys Least Bittern. See No. 81. * GROUP 2. Wing, 6 to inches Crown, greenish or greenish black; legs, orange yellow in life. Butorides Heron. See No. 87. * GROUP 3. Wing, to 11 inches long. Greater part of plumage, slaty blue; belly, slaty blue; head,tinged with purplish brown (adult). Florida ccBtidea. Little Blue No. 86. * For directions for measurement, see page 21. 8o Field Museum of Natural History — Zoology, Vol. IX. General plumage, white; tips of primaries, tinged with slaty blue; legs, yellowish olive (immature). Florida c a; rule a. Little Blue Heron. See No. 86. General plumage, white; ends of primaries, not tinged with slatyblue; legs, black; feet, yellow. Egretta candidissima. Snowy Heron. Snowy Egret. See No. 84. General plumage, tawny brown, mottled and streaked with darkbrown; upper surface of primaries, blackish. Botaurus Bittern. See No. 79. Bill, large; top of head, black; back, green (adult); culmen, aboutas long as tarsus. Nycticorax nycticorax ncevius. Black-crowned Ni
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