No. 19. 



Aythya collaris. 



Adult male. Bill dark slate color with blackish tip and 

 bands of pale blue, a narrow band at base, and broader one near 

 end. A brownish red or mahogany colored ring around neck. 

 Head and neck above ring black, with slight iridescence, and 

 white chin-mark. Neck below ring, fore-breast, and plumage of 

 upper parts blackish. Wings slaty brown ; the wing-mark, or 



BsgsgstS? 



No. 19. Adult Male. 



speculum, bluish gray. Sides of body finely waved with white 

 and blackish lines. Under parts white, with dusky markings 

 towards rear, and black, or nearly black, beneath tail. Legs 

 gray. 



Female. No ring around neck, and no wavy lines any- 

 where. Bill much less plainly marked. Dark parts of plumage 



