94 



KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



* Group 5. Wing, over 15 inches long. 



Plumage, entirely white; wing, over 17 inches; bill, over 5.50; tarsus, over 7.25. 



Ardea occinentalis. Qreat White Heron. 



See No. 143. 



Plumage, entirely white; wing, less than 17 inches long; hill, under 5.50; tarsus 

 under 7.25. Ardm cgretta. American Egret. 



See No. 153. 



Greater part of upper i)luniage, l)luish gray or slaty gray; adults in breeding have 

 middle of crown and throat, white; hill, less than (i.25; immature birds liave the top of the 

 head, black. Ardea herodias. Great Blue Heron. 



See No. 151. 



Similar to Great Blue Heron, but larger; bill, over G.25. Occurs only in Florida. 



Ardea wardi. Ward's Heron. 

 See No. 150. 



I'op of head and sometimes greater portion of head, white; wings and back, bluish gray. 

 or slaty gray; general appearance of Ward's Heron except color of head. Occurs ouly in 

 Florida ; probably a color phase of Ardea ore i dental Is. 



Ardea wuerdemanni. Wuerdeman's Heron. 

 See No. 149. 



* For directions for nifasiireinent, see page 9. 



