70 IBISES 



The fulvous tree-duck is a more or less common summer resident 

 of the tule marshes and irrigated regions of southern California, 

 breeding abundantly in favorite localities and migrating south in 

 winter. Its usual nesting place seems to be on the ground in 

 marshes, but it also breeds in trees. (See Bull. Cooper Ornithological 

 Club, vol. i. No. 1, p. 9 ; and Condor, vol. iii. No. 3, p. 67.) 



GENUS OLOR. 



General Characters. — Size very large ; neck longer than body ; bill 

 black, large, and high at base, with naked space reaching eyes. Plum- 

 age entirely pure white in adults. Young : ashy, or tinged with brownish ; 

 bill and feet grayish or flesh color. 



KEY TO ADULTS. 



1. Distance from eye to back of nostril greater than rest of bill. 



columbianus, p. TO. 

 1. Distance from eye to back of nostril less than rest of bill. 



buccinator, p. 70. 



180. Olor columbianus (Ord.). Whistling Swan. 



Bill black ; lores usually with a small yellow spot. Length : 4^ feet, 

 extent about 7 feet, wing 21-22, bill 3.80-4.20. 



Distribution. — North America, breeding far northward and probably in 

 British Columbia ; migrating south over the United States ; wintering 

 from British Columbia and Illinois southward. 



Nest. — On ground usually on island or bank near water ; made of moss, 

 grass, and leaves. Eggs : 5 to 7, dull whitish. 



181. Olor buccinator {Rich.). Tkumpetek Swan. 



Adult male. — Bill and lores entirely black. Length : 5-5^ feet, extent 8 

 to nearly 10 feet, wing 21.00-27.50, bUl 4.30-4.70. 



Distribution. — Interior of North America, less common toward the 

 coasts, breeding from Iowa and the Dakotas northward, but mainly far 

 north ; wintering from southern British Columbia to Gulf of Mexico and 

 southern California. 



Nest. — On ground, made of grass, leaves, and feathers. Eggs : 5 to 7, 

 dull whitish. 



Mr. Grinnell says that the trumpeter swan is a regular spring 

 visitant to the fresh water ponds and lakes in the vicinity of Los 

 Angeles . 



ORDER HERODIONES: HERONS. STORKS, 

 IBISES, ETC. 



(Families Plataleid^, Ibidid^, Ciconiid^, and Ardeid^.^) 



FAMILY IBIDIDiE: IBISES. 



KEY TO GENERA. 



1. Head of adult mainly naked, crown with short feathers. Guara, p. 71. 

 1'. Head feathered except on lores, crown lightly crested. Plegadis, p. 71 . 



1 See Appendix, page 486. 



