EGGS OF NORTH AMERICAN BIRDS. 27 



Eggs, 8 to 10, rounded oval, ivory-wliite, with a greenish tinge ; 

 1.50 + 2.00 to 1.60 + 2.30. Breeds on the southwestern bor- 

 der of the United States, and southward, in the Bahamas and 

 West Indies. Nests in holes of trees, in April. 



178. Fulvous Tree Duck, Dendrocygna fulva. Eggs, 10 

 to 15, not dissimilar to those of No. 177. Breeds on the south- 

 ern border of the United States, and southward. 



179. Whoopixg Swan, Olor cygnus. Eggs, 6 to 10, oval, 

 dirty white ; 4.30 -f- 2.90 to 4.35 + 2.95. Breeds in Northern 

 Europe, Asia, and Greenland. 



180. Whistling Swan, Olor columhianus. Eggs, 6 to 10, 

 oval, dirty white ; 2.50 + 4.00 to 2.75 -|- 4.50. Nests placed 

 on the ground, in marshes. Breeds in the extreme northern 

 poi'tion of North America. 



181. Trumpeter Swan, Olor buccinator. Eggs, 6 to 10, 

 oval, dirty white; 2.50 + 4.30 to 2.70 -f 4.50. Breeds in the 

 interior of North America, from Iowa and Dakota, northward ; 

 west to the Pacific, but rare on the Atlantic. 



ORDER VI. — ODONTOGLOSS^. Lamellirostral 

 Grallatores. 



Eggs, few in number, one or two, rarely three, covered with 

 a chalky incrustation. 



Nests, composed of marl or clay, formed into truncated cones, 

 on which the eggs are placed, and are usually situated in shal- 

 low salt-water lagoons, or near them. 



Family XV. — PHCENICOPTERID^. Flamingoes. 



Members of this family inhabit the tropics, where they nest 

 in communities; none of the species occur within our limits 

 during the breeding season. 



182. American Flamingo, Phoenicopterus ruber. Eggs, 

 usually 1, occasionally 2, rarely 3, long oval, white, thickly cov- 



