94 



KEY TO THE BIKDS OF EASTERN NORTH AMERICA. 



* Group 5. Wing, over 15 inches long. 



Plumage, eatirely white; wiug, over 17 inches; bill, over 5.50; tarsus, ovtr 7.25. 



Ardca occiacntalis. Great White Heron. 



See No. 143. 



Plumage, entirely white; wing, less than 17 inches long; bill, under 5.50; tarsu<, 

 under /. 25. Ardea ('tjreUa. American Egret. 



See No. 153. 



Greater part of u]iI)<m- j)lumage, Viluish gray or slaty gray; adults in breeding have 

 middle; of crown and thro.at, white; t)ill. less tlian ("..25; innnature birds liavc tiir top of the 

 head, Idack. Ardra herodias. Great Blue Heron. 



See No. 151. 



Similar to Great Blue ner()n, l)ut larger; bill, over 0.25. Occurs only in Florida. 



Arden loardi. Ward's Heron. 

 See No. 150. 



Top of head and sometimes greater portion of head, white; wings .ind back, Iduish gra}\ 

 or slafy gray ; gener.il appearance of AVard's Heron except color of head. Oi-i-urs only in 

 Flori<la : pr(d)ably a color phase of Ardea orridoitdlis. 



Ardea louerdemauiii. Wuerdeman's Heron. 

 Sec No. 14il. 



* For dlre<'tioii8 for measureiiieiit, sec page U. 



