90 



KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



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



Crown, greenish or greenish black; legs, oruiigc yellow iu life. 



Ardea virescens. Green Heron. 

 See No. 158. 



Group 3. Wing, 8.50 to 11 inches long. 



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

 (adult). Ardea ccerulca. Little Blue Heron. 



See No. 157. 



* For directions for measurement, see page 9. 



