395 
of the United States. 
before the eye and auriculars, white ; tail cuneiform of four- 
teen pointed feathers ; bill very slender, nail curved. 
Male bluish-slate, varied with black and white; eyebrows 
and flanks rufous. 
Female uniform slatish-brown, belly whitish. 
Harlequin Duck , Anas histrionica , Wils. Am. Orn. viii. 
pi. 139. pi. 72. fig. 4- 
Inhabits the Arctic regions of both continents, extending 
but little to temperate countries : rare and accidental during 
winter in the middle states. 
346. Fuligula glacialis, Nob. Mirror brown, subuniform 
with the wing ; a whitish space around the eye ; tail cunei- 
form, of fourteen pointed feathers. 
Male varied w 7 ith black and white ; middle tail feathers 
greatly elongated. 
Female sooty brown, beneath white ; crown blackish. 
Long-tailed Duck , Anas glacialis, Wils. Am. Orn. viii . 
p. 93. pi. 70. fig. l. male. p . 96. pi. 70 fig. 2. female. 
Inhabits the Arctic regions of both continents, whence it 
migrates periodically in winter : very common all along the 
coasts of the union : found in temperate Europe, but rare 
and accidental. 
75. MERGUS. 
Mergus, L . Gm . Lath. 111. Cuv. Temm. Vieill. Ranz . 
Merganser , Briss. Mergus, Merganser, Steph. 
Bill moderate, straight, somewhat cylindrical, depressed 
and broader than high at base, narrow, subulate, and somewhat 
compressed at the point ; edges serrated, teeth inclined back- 
ward, subulate, acute ; upper mandible hooked and unguicu- 
lated at tip ; lower shorter, narrower, quite straight, obtuse : 
nostrils submedial, lateral, longitudinal, very small, elliptic, 
open, pervious, covered by a membrane: tongue thick, fleshy, 
almost subulate, furnished above with hard, recurved papillae. 
Head moderate, somewhat compressed ; neck well proper- 
