90 



KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



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



Crown, greenish or greenish black; legs, orauge yellow iii life. 



Ardea virescens. Qreen Heron, 

 See No. 158. 



* Group 3. Wing, 8.50 to 1 1 inches long. 



Greater part of plumage, slaty blue; belly, slaty blue; head, tinged with purplish brown 

 (adult). Ardea ccerulen. Little Blue Heron. 



See No. 157. 



* For directions for measurement, see page 9. 



