KEY TO DUCKS, GEESE AND SWANS OF NORTH AMERICA. 



21 



Top of head and wing coverts, not white ; plumage, dull brown, mottled on the 

 underparts. 



Harlequin Duck. 



Histrionicus histrionicus (female) . 

 See page 66. 



Top of head, white ; wing coverts, white ; rump, bluish black. 



Stellers' Duck. 



Eniconelta stelleri. 

 See page 73. 



GROUP IV. 



Birds having wings from 8.50 to 10 inches long.* 

 Section I. Bill narrow, with tooth=Iike serrations. 



Distance from nostril to tip of bill, less than 

 1 .50 ; liead and neck, greenish black ; under- 

 parts, creamy white, tinged with salmon color; 

 feet, red. 



American merganser. 

 Sheldrake. 



Merganser americana (niale) . 

 See page 37. 



Merganser americana. 



Distance from nostril to tip of bill, less than 1.50 ; head, rufous brown ; upper 

 throat, white ; feet, orange red. American flerganser. 



sheldrake. 



Merganser americana (female). 

 See page 37. 



/ Distauce from nostril to tip of bill, more than 1 .50 ; 



-^ head, black tinged with green ; breast, rufous 



streaked with black. Red^breasted Merganser. 



Merganser serrator (male). 



See page 38. 

 Merganser seiTator. ^ " 



Distance from nostril to tip of bill, more than 1.50 ; head, brownish, palest 



on the throat; speculum, white. Red-breasted Herganser. 



Merganser serrator (female). 

 See page 38. 



* For directions for measurements, see page 6. 



