WINTER GROUP — WATER BIRDS 85 



214. RED-THROATED DIVER. 



29. Head and neck, bhdsh-gray ; hind-neck^ white- 

 streaked ; elsewhere^ above, black ; below, EXCEPT chest- 

 nut THROAT, white; rare and irregular in Fa. and 

 N.J. 



215. MERGANSER: FISH DUCK. 



24. Head and neck, lustrous-green ; back and wings, black 

 and white ; below, pinkish-red ; in AdWks in summer, 



216. RED-BREASTED MERGANSER. 



24. Head and neck, dark lustrous-green ; back and 

 wings, black a?td white ; throat and breast, deep reddish- 

 brown ; elsewhere, below, pinkish-iuhite. 



217. HOODED MERGANSER. 



19. Prominent crest, head, neck all round, and upper 

 parts, black ; below, from neck, white ; sides, finely dark- 

 streaked ; rare ; in AdWks in summer. 



218. WHITE-WINGED SCOTER. 



24. Pure black, except large white wing-patch, and 

 white spot under eye. 



219. BLACK SCOTER. 



23. Pure black ; rare in Pa, 



220. SURF DUCK. 



23. Black throughout, except white patch on forehead 

 and one on hind-head, 



221. GREATER SCAUP DUCK. 



20. Above, black ; white patch on wing ; throat and waiter 

 breast, black ; rest, white. 



