No. 16. 



Aythya americana. 



Adult male. Head and upper neck mahogany colored ; bead 

 large with full puffy feathering ; remainder of neck, fore breast, 

 and around on extreme forward part of back continuously black 

 or blackish. Plumage of back and sides finely zigzagged with 

 dull white and slaty black; the lower back and tail grayish 



No. 10. Adult male. 



brown ; and immediately about tail blackish. Wings princi- 

 pally two shades of bluish gray, their under surfaces grayish 

 and white. Under surface of body white, shading darker with 

 brownish gray towards tail. Bill pale blue (in life) with black 

 end ; length of bill, measured along edge from corner of mouth, 

 4 



