No. 2O. 



Merganser americanus. 



Bill rather cylindrical in shape, hooked at point, and fur- 

 nished with very positive teeth, entirely unlike what is under- 

 stood as a duck bill ; see outline drawings under Ko. 21. 



Adult Male. Head and upper neck dark green, or blackish 

 with green gloss ; a slight, scarcely noticeable crest. Eyes and 

 bill red ; the latter, however, having its ridge, and " nail " at 



end black. Lower neck all around, and under parts of body 

 white, more or less deeply tinged (in life) with buff. Sides of 

 rump faintly waved with gray. Tail, and lower part of back, 

 gray; remainder of back black. Wings white and black, as 

 indicated in picture. Legs red. 



Female. Head and upper neck, including crest, reddish 



