“146. Redhead (Aythya americana). L.19. Ad. . 
ca and upper neck entirely bright reddlsii brown. 
d. @. Throat white; back grayish brown without 
Ae bars; speculum gray. Notes. ‘‘A hoarse guttural 
rolling sound.” (Elliot.) 
Range.—North America; breeds chiefly in interior from Maine, 
Minnesota, and California north to Labrador and British Columbia; 
winters from British Columbla and Maryland south to Lower Cuali- 
fornia and West Indies. 
e147. Canvas-back (4ythya vallisneria). L. 21. Ad. 
co. Head and whole neck dull reddish brown. Ad. &. 
Head and neck rusty grayish brown; back grayish 
brown, finely barred with black and white. Notes. ‘‘A 
harsh guttural croak.’? (Elliot.) 
Range.—North America; breeds only in interior from Minnesota 
and Oregon north to Alaska andthe Barren Grounds; winters from 
British Columbia and Maryland south to southern California, Mexico 
and West Indies. 
148. American Scaup Duck (4ythya marila).  L. 
o’, 18.5; 2, 17.5. Ad. d'. Head glossed with green- 
ish; sides without distinct black bars. 4d. 2. Feath- 
ers about base of bill white; breast and back rusty 
grayish brown; speculum white. Notes. ‘‘Similar to 
the guttural sound made by the Canvas-back, Red- 
head and other diving Ducks.” (Elliot.) 
Range.—Northern parts of northern hemisphere; In America, breeds in 
the interior rarely from Minnespta, and regularly from North Dakota 
northward; winters from Long Island to northern South America. 
149. Lesser Scaup Duck (4ythya affinis). L. Gf 17; 
©,16.5. Ad. §'. Head glossed with purplish; sides 
with distinct black bars. Ad. 2. Similar to 2 of No. 
148, but smaller. 
Range.—North America; breeds only in_interior from Iowa rarely, 
North Dakota commonly, and British Columbia, north to Barren 
Grounds; winters from British Columbia and Virginia south to Guat- 
emala and West Indies. 
150. Ring-necked Duck (Aythya collars). L. 16.5. 
Ad. 3. Achestnut neck-ring; chin white; back black; 
speculum gray. Ad. 9. Feathers about sides of base 
of bill and throat white, back and breast rusty grayish 
brown; speculum gray. Resembles 2 of No. 146, but 
is smaller and rustier. 
Range.—North America; breeding only in the interior from Minne- 
sota northward; winters from Maryland and British Columbia south 
to Guatemala and West Indies; rare on Atlantic coast north of Mary- 
land. 
79 
Laboratory of Ornithelogy 
45@ Sapsucker Woods Reed 
Cornett University 
Ithaca, New York 41485 } 
Ducks. 
