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



79 



Under parts and sides of the head and throat, buff white ; a black 

 patch 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 neoxenus. 



Cory's Least Bittern. 



See No. 81. 



* GROUP 2. Wing, 6 to 7.50 inches long. 



Crown, greenish or greenish black; legs, orange yellow in life. 



Butorides virescens. 

 Green Heron. 

 See No. 87. 



* GROUP 3. Wing, 8.50 to n inches long. 



Greater part of plumage, slaty blue; belly, slaty blue; head, 

 tinged with purplish brown (adult ) . Florida ccerulea. 



Little Blue Heron. 



*For directions for measurement, see page 21. 



See No. 86. 



