226 KEY TO THE WATER BIRDS OF FLORIDA. 
Supramity FULIGULIN4. Bay anp Sea Ducks. 1 
Ducks having flap or membranous lobe on hind toe. 
Genus AYTHYA Botr. 
AYTHYA AMERICANA (Eyz.). 
Red=head Duck. 
Adult male: Head and neck brownish chestnut; lower neck and upper breast black- 
ish; back apparently grayish being pencilled with wavy lines of black; speculum grayish ; 
upper feathers edged with black, the rest narrowly tipped with white. 
Length, 21; Wing, 8.40; Tarsus, 1.60; Bill, 2.20. 
Adult female: Bill bluish showing an indistinct bar near the end; head and neck reddish 
brown, palest on the sides of the head, becoming ashy on the sides of the head; upper throat 
white; breast and sides brownish; belly white; under tail coverts and lower belly sometimes 
washed with pale brownish. 
Length, 20.50; Wing, 8.30; Tarsus, 1.60; Bill, 2.20. 
This is rather a Western species, as it breeds very rarely on the Atlantic 
coast of the United States. It is common in the West breeding from 
