ANATID.E. LX. 143 



13. AYTHYA, Boie. CANVAS-BACK DUCKS. 



1. A. ferina (L.) var. americana, (Eyton) Allen. RED 

 HEAD. POCHARD. $ head and neck chestnut with red 

 reflections; back mixed silvery and black; the dark 

 waved lines unbroken; $ duller; bill shorter than head, 

 two or less, bluish, the nail dark; L. 20; W. 10. N. Am., 

 abundant. 



2. A. va//isner/a, (Wilson) Boie. CANVAS - BACK DUCK. 

 Head more dusky; black wavy lines on back broken, the 

 whitish predominating; bill as long as head, 2% or more, 

 dusky. N. Am.; especially coastwise in winter. 



4. BUCEPHALA,Bsiird. GOLDEN -EYES. 

 Clangula, Authors. 



1. B. clangula, (L.) Gray. GOLDEN -EYE. GARROT. 

 $ head puffy, glossy green with some white; upper parts 

 black; white continuous on outer surface of wing; $ 

 head duller, snuff- colored and scarcely puffy; L. 16 to 

 19; W. 8 to 9. N. Am. and Europe. 



2. B. islandica, (Gm.) Baird. BARROW'S GOLDEN-EYE. 

 Similar; .gloss of head purplish; white of wing divided 

 by dark bar; more white on head; larger. N. U. S. and 

 N.; rare. 



3. B. albeola, (L.) Baird. DIPPER. BUFFLE-HEAD. 

 BUTTER- BALL. SPIRIT DUCK. $ with head very puffy 

 and iridescent; a large white ear patch; L. 16; W. 7; ? 

 small, dark gray ; head scarcely puffy. N. Am., 

 abundant. 



15. HARELDA, Leach. LONG - TAILED DUCKS. 



1. H. glacial is, (L.) Leach. SOUTH - SOUTHERLY. OLD 

 WIFE. LONG -TAILED DUCK. Reddish brown, nearly 

 white in winter; tail very long; $ quite different, no 



