10 



Less than 2^ feet long. 

 a. No conspicuous white marks. 



Purple, metallic patch on wing ; bill blunt, flat. 



Dusky Duck. 

 No metallic patch on wing ; l)ill acute, compressed, 



Houboell's Grebe. 

 aa. More or less white on head, neck or wings, 

 b. With compressed, semi-circular crest. 



Hooded Merganser. 

 bb. No such crest. 



c. Little white on wings. 



A loose flowing crest ; breast spotted, 



Wood Duck. 

 No crest at all ; breast unspotted, not black. 



Pin-tailed Duck^ 

 No crest; head, neck, upper breast black. 



Brant. 

 cc. Much white on winas. 



d. Much blue on wings, 

 dd. No blue on wings. 

 A slight, loose crest. 



Shoveller Duck. 



RED-r.KEASTED MeRGANSER. 



No distinct crest. Common Merganser. 



Long-legged wading birds. 



A. Plumage white. 

 Length over 3 feet. 

 Length about 2 feet, 



B. Plumage not white, 

 a. Length over 3| feet, 

 aa. Length from 2 to 2^ feet. 



Prevailing colors buff and lilack ; a black patch on 

 side of neck, Bittern. 



Prevailing colors not buff and black ; no black patch 

 on side of neck. Night Heron. 



American JCgret. 

 Snowy Heron. 



Great Blue Heron. 



