94 



KEY TO THE BIKDS 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 occiaentalis. Great White Heron. 



See No. 143. 



Plumage, entirely white; wing, less than 17 inches long; bill, under 5.50; tai'su-, 

 under 7.25. Ardea eijretta. American Egret. 



See jSTo. 1.5.3. 



Cireater part of upper plumage, bluish gray or slaty gray ; adults in breeding have 

 middle of crown and throat, white; bill, less than 6.25; immature birds have the top of the 

 head, black. Ardea li.erodkis. Great Blue Heron. 



See No. 151. 



Similar to Great Blue Heron, but larger; bill, over 0.25. Occurs only in Florida. 



Ardea wardi. Ward's Heron. 



See No. 150. 



Top of iiead .and sometimes greater portion of head, white; wings and back, l)luisli gray, 

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

 Florida; ijrobably a color phase of Ardea oceideiiiaUs. 



Ardea vmerdemanni. Wuerdeman's Heron. 



See No. 149. 



* Fur tUrfM-tions for nicayureniuni, bco page 'J. 



