100 SUBFAMILY FULIGULINM 



1. Upper mandible fringed with a soft membrane toward tip; lower mandible with tip flat 

 and spatulate Camptorliynchux 



2. Upper mandible not fringed with a membrane near tip; rather narrow and pointed; ter- 

 tials, especially in males more or less falcate. 



aa. Edges of upper mandible bent inward; lower mandible with apical portion flat 

 and almost spatulate Eniconetta 



bb. Edges of upper mandible not bent inward. 



Base of culmen extended back on to the forehead in two narrow divergent angles. 



Somateria 



Base of culmen without such prolongations, the feathering extending quite to the 

 nostrils Arctonetta 



