39 



KEY TO WATERFOWL (Cont.) 



37' Nostril near base of bill; feathering on side of upper mandible 

 near gape extends forward of that on lower mandible (Plate 19-2); 

 feathering of forehead and on sides of upper mandible extends an 

 equal distance toward bill tip; wing 213-257 mm. 39 



38 Head, neck and back green; breast, belly and sides white to faintly 

 salmon. COMMON MERGANSER, male 



38' Head and neck chestnut; distinct demarcation between neck color and 



whitish of breast. COMMON MERGANSER, female and immature 



39 Head green, throat largely white; sides grayish. 



RED-BREASTED MERGANSER, male 



39' As in 37' but neck color grading gradually into whitish breast. 



RED-BREASTED MERGANSER, female and immature 



40 Wing length >255 mm; wing entirely dark except for white of inner 



and middle secondaries and coverts. 41 



40' Wing <246 mm. 42 



41 Body black dorsally; yellow-orange on bill; feet orange with black 

 webs; greater secondary coverts tipped with white. 



WHITE-WINGED SCOTER, male 



f 



41' Body brown dorsally; feet brown with black webs; greater secondary 



coverts entirely dark. WHITE-WINGED SCOTER, female and immature 



42 Feet yellow with dark webs. 43 

 42" Feet pink or gray. 45 



43 Breast entirely white. 44 



43' Breast white with gray collar. 



BARROW'S and COMMON GOLDENEYE, female and immature 



44 Greater coverts black, center ones tipped with white; crescent- 

 shaped white spot between eye and bill. BARROW'S GOLDENEYE, male 



