72 KEY TO THE BIRDS OF EASTEHN NORTH AMERICA. 



Head, grecnisli i)nri)l(\ no whitf on Ih-jkI; l)ae-k, dull black ; speculum, gray (male). 



Aiith'ja roUaris. Ring=neck Duck. 

 See No. 107. 

 Head, dull lnown, 1iro\vui-li white at base of bill and b(do\v eye: speculum, gray 

 (ft'niale). A>ith>i<( coUaris. Ring=neck Duck. 



See No. 107. 

 Head, greenish purple, a lai<?e patch of white on back of head (male). 



J, Charitone.tta alheola. Buffle=headed Duck. 



K See No. 110. 



Hea<k dark brown or dusky, a patch of white behind the eye (on ear coverts); no 

 while or brownisli white at base of bill; speculum, white (female). 



Charitonetta alheola. Buffle=headed Duck. 

 See No. 110. 



Section 2. Belly, not white. 



Plumage, variously marked with white, slate-color, and chestnut (male). 



HistrlunicjiA histrioitirna. Harlequin Duck. 

 See No. 112. 

 General jdumage, dull brfiwn, mottled on the under parts (female). 



Histrionicm histrionirvs. Harlequin Duck. 

 See No. 112. 

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



EniconcUa stfUeri. Stellers' Duck. 

 See Xo. 114. 

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



Eniconetta stellprl. 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 i)atch of dull white on face at base 

 of bill; speculum, white (lemale). 



A'jthijii iiiarild. Greater Scaup Duck. Blue^bill. 



See No. 105. 



Aytliya iiiarila nc.irctica. 

 Speculun), vhite, similar to ])receiling but somewhat smaller (female^). More common in 

 the South than the Greater Scauj) Duck. Aiithya nlJinis. Lesser Scaup Duck. 



See No. 106. 



For (iireotions for measurement, see page !i. 



