EGGS OF NOETH AMERICAN BIBBS. 2S 



smooth, pale brown ; 1.05 -f- l-oo to 1,15 to 1.65. ISTests placed 

 in holes of trees. Breeds throughout temperate North Amer- 

 ica, from May to June. 



145. Rufous Crested Duck, Netta rujina. Eggs, not dis- 

 similar to those of No. 146. Occurs in the Eastern Hemis- 

 phere ; accidental in the Eastern United States. 



146. Redhead, Aythya americana. Eggs, 6 to 10 ; ellipti- 

 cal, quite smootii, creamy white; 1.65 -\- 2.20 to 1.75 -|- 2.30; 

 known by the creamy white color and large size. Nests placed 

 on the ground. Breeds throughout North America, from Cal- 

 ifornia and Maine, northward. 



147. Canvas-back, Aythya vaEisneria. Eggs, 6 to 10, el- 

 liptical, smooth, ashy green; 1.70 -|- 2.50 to 1.75 -|- 2.55; 

 known from those of No. 146 bv the ijreen color and larcrer size. 

 Breeds throughout the Northwestern States, northward, to 

 Alaska. 



148. American Scaup Duck, Aythya marila nearctica. 

 Eggs, 6 to 10, elliptical, smooth, greenish, 1.70 -|- 2.36 to 1.75 

 -j- 2.50. Breeds in the far northern regions of North America, 

 in May and June. 



149. Lesser Scaup Duck, Aythya affinis. Eggs, indistin- 

 guishable in form and color from those of No. 148, but smaller; 

 1.60 4- 2.25 to 1.65 + 2.30. Breeds throughout North Amer- 

 ica, north of the United States, in May and June. 



150. RrvG-NECKED Duck, Aythya collaris. Eggs, 6 to 10 ; 

 indistinguishable from those of No. 149. Breeds in the ex- 

 treme northern portion of North America. 



151. American Golden-eye, Glaucionetta clangvla ameri- 

 cana. Eggs, 6 to 10, elliptical, smooth, greenish; 1.75 -(-2.35 

 to 1.80 -f- 2.40 ; placed in holes of trees. Known from all but 

 those of No. 152 by the deep greenish color and size. Breeds 

 from Maine northward, in May. 



152. Barrow's Golden-eye, Glaucionetta islandica. Eggs, 

 not to be distinguished from those of No. 151, and breeding 

 habits similar. Breeds from Gulf of St. Lawrence northward; 



