104 
NORTH AMERICAN BIRDS. 
Top of head and back of neck dark brown, rest of head and neck paler, 
becoming nearly or quite white anteriorly and on throat; chest, sides, 
and flanks deep fulvous brown; breast and belly white; upper parts 
nearly uniform dull dark brown, the speculum bluish gray, as in the 
male. Downy young: Above grayish brown, relieved by seven spots of 
light buff, as follows: A small spot in middle of upper back, a large 
patch on each side of back, another on each side of rump, and a bar 
across hinder border of each wing; top of head and hind-neck deep 
grayish brown; rest of head and neck, including forehead, with lower 
parts, light dingy buff, the flanks crossed by a brown transverse patch ; 
side of head without any markings, except a spot of grayish brown on 
ear-coverts. Length 15.50-18.00, culmen 1.75-2.00, tarsus 1.30-1.45, 
middle toe 2.00-2.15. Eggs 2.23 X 1.57, same color as in nearctica and 
afinis. Hab. North America in general, breeding northward ; south, in 
winter, to Guatemala and West Indies. 
150. A. collaris (Donov.). Ring-necked Duck. 
Genus GLAUCIONETTA Sresnecer. (Page 85, pl. XXIV, fig. 4.) 
Species. 
Common Cuaracters.—Adult males with head and upper neck black, glossed 
with green, blue, or violet, and relieved by a white patch between bill and eye; 
upper parts pied black and white, lower parts entirely white, the flanks streaked 
with black. Females with head and upper neck brown, chest and part of upper 
surface grayish, collar round neck and most of lower parts white; wing dusky, 
with white on wing-coverts and secondaries. Young males similar to adult females, 
but white loral spot of adult more or less distinctly indicated, and gray of chest 
less extensive (sometimes quite obsolete). Male in post-nuptial plumage: Similar to 
young male, but wing-coverts more continuously white. 
a, Height of upper mandible at base, measured from point of frontal angle to 
nearest point on cutting-edge, less than distance from anterior edge of loral 
feathering to anterior end of nostril, and usually little if any greater than 
distance from latter point to tip of upper mandible. Adult male: Head and 
upper neck glossy greenish black, with a large roundish or oval spot of 
white on lower part of lores; white wing-patch uninterrupted by black 
bands or bars. Adult female: Brown of head (usually deep hair-brown or 
grayish umber) reaching down only to upper part of neck, and not so far in 
front as elsewhere; gray of chest narrower, usually less deep, and white 
collar broader; greater wing-coverts usually without distinct blackish tips; 
nail of bill not more than .20 wide. Downy young: Upper parts, including 
upper half of head, to below eyes, broad band across chest, sides, and thighs, 
uniform deep sooty brown, lighter and more grayish on chest, the upper 
parts varied by about eight white spots; chin, throat, and cheeks pure 
white, in abrupt and decided contrast with the circumjacent brown; remain- 
ing lower parts (except chest) grayish white. 
