KEVES AND WILLIAMS BIRDS OF IOWA. II9 



Subfamily CYGNIN.E. Swans. 



Genus OLOR Wagler. 

 [B 561 /us, R 588, C 6S9, U 180.] 

 Olor columbianus (Orel.). Whistling Swan. Rare migrant. 



[B 562, R 589, C688, U 181.] 

 Olor buccinator (Rich.). Trumpeter Swan. Migratory; not com- 

 mon. Said to breed in the northwestern part of the State. 



Order HERODIONES. Herons, Storks, Ibises, Etc. 



Suborder HERODII. Herons, Egrets, Bitterns, Etc. 



Family ARDEIDiE. Herons, Bitterns, Etc. 



Subfamily BOTAURIN2E. Bitterns. 



Genus BOTAURUS Hermann. 



Subgenus BOTAURUS. 



[B 492, R 497, C 666, I" 190.] 



Botaurus lentiginosis (Montag.). American Bittern. Migratory; 



common in Southern and Central Iowa. Summer resident in the 



northern part of the State, where it breeds abundantly about the "lakes" 



and grassy marshes. 



Subgenus ARDETTA Gray. 



[B 491, R 498, C 667, U 191.] 

 Botaurus exilis (Gmel.). Least Bittern. Common summer resi- 

 dent. Breeds in the "sloughs." The nest is a small platform of stems 

 of plants woven among the growing stems of the Indian rice (Zizania 

 aqi/atica), and placed about a foot above the water. Eggs four or 

 five, laid about the last of May. 



Subfamily ARDEINiE. Herons and Egrets. 



Genus ARDEA Einn.kus. 



Subgenus ARDEA. 



[B 487, R 487, C 655, U 194.] 

 Ardea herodias Linn. Great Blue Heron. Migratory; common. 

 Breeds in the vicinity of Spirit Lake and other parts of Northern Iowa. 



Subgenus HERODIAS Boie. 

 [B 486, 486*, R 489, C 65S, U 196.] 

 Ardea egretta Gmel. American Egret. Summer resident; rare. 

 Observed along the borders of wooded streams. 



