38 



KEY TO WATERFOWL (Cont.) 



30 Tertials tipped with white, 

 30' Tertials all one color. 



SPECTACLED EIDER, female 

 31 



31 Only inner secondaries and inner greater secondary coverts tipped 



with white. KING EIDER, female 



31' All secondaries and secondary coverts tipped with white. 



COMMON EIDER, female 



32 Secondaries white tipped with dark. (SCAUP) 33 



32' Secondaries white not tipped with dark (but some secondaries may 



be entirely dark). 36 



33 Some white on outer web of the 5 inner primaries and wing length 



>220 mm. 34 



33' No white on outer web of the 5 inner primaries and wing length 

 <208 mm (birds not fitting 33 or 33' should be compared with 

 specimens for identification). 35 



34 Head mostly glossy greenish. 



GREATER SCAUP, male 



34' Head brown but forehead and front of face may be white. 



GREATER SCAUP, female and immature 



35 Head glossy mostly purple. 

 35' As in 34'. 



LESSER SCAUP, male 

 LESSER SCAUP, female and immature 



36 Inner secondaries and inner greater secondary coverts white; outer 

 secondaries and outer greater secondary coverts green; bill long 

 and slender with serrate edges (Plate 19-1). (MERGANSER) 37 



36' Wing pattern not as above; bill more duck-like (broad and flat). 



40 



37 Nostril near middle of bill; feathering on bill near gape (corner of 

 mouth) extends forward as far as that on lower mandible (Plate 19-1); 

 in dorsal view, forehead feathering extends farther on bill toward 

 bill tip than does feathering on side of upper mandible; wing length 

 246-285 mm. 38 



