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 

 affinis. Hob. North America in general, breeding northward ; south, in 

 winter, to Guatemala and West Indies. 



150. A. collaris (DoNov.). Ring-necked Duck. 



GENUS GLAUCIONETTA STEJNEGER. (Page 85, pi. XXIY., fig. 4.) 



Species. 



COMMON CHARACTERS. 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 1 . 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. 



