FAMILY ARDEID^E. HERONS, EGRETS, AND BITTERNS. 93 



* Group 4. Wing, 11 to 15 inches long. 



Bill, stout; to*p of the head, black; back, dark green (adult). 



Nycticorax nycticorax ncevius. Night Heron. 

 See No. 159. 



Bill, stout; top of head, white or whitish; back, not green (adult). 



Nycticorax violaceus. Yellow=crowned Night Heron. 



See No. 160. 



Bill, stout; general plumage, mottled and streaked brown and white; outer edge of 

 primaries, reddish brown (immature). Nycticorax nycticorax ncevius. Night Heron. 



See No. 159. 



Bill, stout; general plumage, mottled and streaked grayish brown and white; primaries, 

 slaty brown (immature). Nycticorax violaceus. Yellow=crowned Night Heron. 



See No. 160. 



General plumage, white ; bill, yellow; legs, black. Ardea egretta. American Egret. 



See No. 153. 



General plumage, white; legs, dark olive; terminal half of bill, black; basal half, 

 flesh color (white phase). Ardea rufescens. Reddish Egret. 



See No. 155. 



Head and neck, rufous chestnut; rest of plumage, slate color, or slaty gray. 



Ardea rufescens. Reddish Egret. 

 See No. 155. 



General plumage, yellow brown, mottled and streaked with dark brown; upper surface of 

 primaries, blackish. Botaurus lentiginosus. American Bittern. 



See No. 145. 



* For directions for measurement, see page 9. 



