90 



KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



Group 2. Wing, 6 to 7.50 inches long. 



Crown, g-reeuish or ijreeiii.sh black; legd, uiuugc yellow iu life. 



Ardea vh'escens. Green Heron« 

 See No. 158. 



* 



Group 3. Wing, 8.50 to 11 inches long. 



■» -.'-^i 



Greater part of i)luniage, slaty blue ; belly, slaty blue ; head, tiuijed with ]iurplish brown 

 (adult). Ardea cccmlca. Little Blue Heron. 



See No. 137. 



* For (lirectionw for nieasurenient, see page 0. 



