Male (102), 2 bls. 4 oz. to 3 lbs. 9 OZ; AV. 3 1bs. 
Female (102), 1 1b. 14 og. to 3 lbs. 6 og.: av. 2 lbs. 13 of. 
and upper Mackenrie Valley south to 
- Great Slave Lake 
General Distribution.--Breeds from 
Saat oes Oregon, northern Utah, northern New Mexico and southwestern Nebraska, east to 
central Manitoba and South Dekota. Winters from southern British Columbia, Colorado, 
southern Illinois and Chesapeake Bay to central México, coaste of the Gulf States and 
Florida. : 
Distribution in Guatemala.--Recorded only on a lake near Duenas. 
not observed during this survey. 
Records.--This species was ed only from DueSas (Salvin and Godman). 
In literature it has been record 
Habits and Hunting.--See the general discussion on waterfowl. 
16. Aythya collaris (Donovan) 
Ring-necked Duck 
Englieh: ringneck, ringbill 
Status.e—The ring-necked duck is probably a regular though uncommon migrant and winter 
visitant e 
Description.-~A small duck about the size of a scaup. ; 
cal Adult male.--Head and neck black, iridescent, chestnut collar-around lower neck; 
chest, back, and rump black; breast white with white crescent extending conspicuously in 
front of wing, belly brownish black, sides grayish with fine gray and white vermiculations; 
tail dark, upper and under tail coverts black; wing with coverts grayieh brown, secondaries 
with light gray speculum. Head has crested appearance, bill grayish blue with black tip 
and two whitish rings, one at base and one near tip, iris orange yellow, legs and feet 
grayish blue. In flight the black back and gray wing stripe are diagnostic. 
Adult female.—General coloration brown, darkest on head and back, head paler 
around bage of bill and with elightly crested appearance; bill with conspicuous white band 
near tip, white ring around eye; belly white; wing similar to that of male. 
Measurements.-- 
Length, 393. 7-457. 2 
Wingspread, 635.0-762.0 
Wing, 177.8-215.9 
Tail, 68,6-86.4 
Tarsus, 30.5-35.6 
Culmen, 43,.2-50.8 
Female smaller than the male. 
Weight.-- 
Male (23),1 1b. 5 oz. to 1 1b. 15 oz.3 av. 1 1b. 11-1/2 ox. 
Female (23), 1 1b. 3 oz. to 1 lb. 13 oz.: av. 1 1b. 8-1/2 ox. 
General Distribution.--Breeds in North America chiefly from Lake Athabaska and northern 
Alberta and Saskatchewan southeastward to Manitoba and thence south te North Dakota and 
Wisconsin. Breeds also in southern British Columbia, Oregon, northern California and 
Nebraska. Winters in southern United States (chiefly Gulf Coast and Florida) south to 
Guatemala, the Bahamas and the Greater Antilles. ; 
Distribution in Guatemala.--Recorded on the Pacific Coast, at Lake Petdn, and on interior 
highland lakes. Probably present occasionally on lagunas of the Caribbean coastal plain. 

Recordg.--Lake Petén, flock of twenty, January 30, 1947. r 
In literature it has been recorded from: Cobdn, Lake of Duenas (Salvin and Gedman). 
32 
