228 KEY TO THE WATER BIRDS OF FLORIDA. 
Suscenus FULVIGULA STEPHENs. 
(Male.) 
(Female.) 
AYTHYA MARILA NEARCTICA Sven. 
American Scaup Duck. 
Adult male: Head and neck and upper breast black showing greenish reflections; back 
grayish white delicately lined with fine wavy lines of black, giving it a grayish appearance; 
speculum white; under parts white, the lower belly showing grayish tinge. 
Length, 19; Wing, 8.50; Tarsus, 1.50; Bill, 2. 
Adult female: Patch at the base of the bill white or grayish white, rest of the head and 
neck, breast and upper back brownish; belly white; speculum white. 
Length, 17.75 ; Wing, 8.25; Tarsus, 1.30; Bill, 1.60. 
Species ranges throughout North America, breeding north of the United 
States. It ranges in winter south to the Bahama Islands, and on the Atlan- 
tic coast south to Florida, although it is not nearly as abundant in Southern 
waters as A. m. afinis, to which it is very closely allied. There are, ap- 
