72 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



Hend, on-tMiish purpl''- u'^ ^vhitc on he;id ; buck, dull Waok ; speculum, gray (male). 



Aythija roUaris. Ring=neck Duck. 



See No. 107. 



Head, dull l.rown, browni-li white .at base of bill aud below eye; speculum, gray 

 (^(■,.,-i-|.il,A Aijthijit collaris. Ring=neck Duck. 



See No. 107. 



Head, greenish purple, a larse patch of white on back of head (male). 



CUaritoncltn nUieola. Buffle=headed Duck. 



See No. 110. 



Hea.l, dark browii or du.^ky, a patch of white behind the eye (on ear coverts); no 

 white or brownish white at liase of liill: speculum, white (female). 



CharitoneUu alhcohi. Buffle-headed Duck. 

 See No. 110. 



Section 2. Belly, not white. 



Plurnase, variously markeil with white, slate-color, aud chestnut (male). 



Histrioniaisi histrionicus. Harlequin Duck. 

 See No. 112. 

 General plumage, dull lirown, mottled on the uuder parts (female). 



HixtrionicHs: histrionicvt:. Harlequin Duck. 

 See No. 112. 

 Head, mostly white, greenish on lores and occiput (male). 



Eniconetln stelleri. Stellers' Duck. 

 See No. 114. 

 Head, light brown; belly, clear, sooty brown (female). 



Eiticoiu'tta steUn-i. Stellers' Duck. 

 See No. 114. 



* Group 3. Wing, from 7.50 to 8.50 inches long. 



Section 1. Head, marked with more or less white or 

 brownish white; belly, white, sometimes tinged with 

 dusky or gray on lower part. 



Head, brownish ; a patch of dull white on face .at base 

 of bill; speculum, white (female). 



Aiilhijii iiiiirila. Greater Scaup Duck. Blue-bill. 



See No. 105. 



AytLiyii inarila Tioarctica. 

 Speculum, I'^hitp, similar to ])receding but somewhat smaller (female"). Moi'e common in 

 the South than the Greater Scaup l)iu:k. Aijthyn affliiis. Lesser Scaup Duck. 



See No. 106. 



* For (ilrectiouB for iiieafiureineut, etifi page !l. 



