Measurenents.-- 
Length, 431.8-533.4 
Wingepread, 749. 3~889.0 
Tail, 76.2-88.9 
Tareus, 33.0-38.1 
Culmen, 63.5-71.1 
Weight.-— 
Male (86), 1 1b.3 os. to 1 1b. 13 og.: av. 11d. 7 of. 
Female (68), 15 oz. to 1 1d. 10 oz.: av. 1 1b. 4 os. 
Distribution.--Breeds in the Britieh Isles eastward through Burope and Asia to the 
Kolyma delta, usually about to the Arctic Circle, and south to France, Turkey, the Black 
Sea, Transcaspia, Turkestan, northern Mongolia (17), Transbaikalia, Amur, Ussuri and 
Kenchatka (7). In North America from Kotzebue Sound to the lower Mackenzie and south- 
eastward to Lakes Athabaska and Winnipeg; south to central California, northern New Mexico, 
Kansas and Indiana. Winters in Europe and Asia from the southern border of its breeding 
range to northern and eastern Africa, Persian Gulf, India, Ceylon, Burma, southern China 
and Japan; in North America on the Pacific coast from Puget Sound; inland in the lower 
Mississippi Valley and on the Atlantic coast from Chesapeake Bay southward regularly to 
Honduras: the Hawaiian Ielands. Many instances of casual occurrence. 
Distribution in Guatemala.--Waters of the Pacific coastal plain and probably also along 
the Caribbean coast. Most often observed on shallow coastal lagoons. 
Records.--Lake Amatitlhn, 25, January 29, 1947, and 2, March 16, 1947; Lake Atescatempa, 
225, March 14, 1942, 40, April 26, 1946; and 75, January 29, 1947; Lake Retana, 1500, 
March 25, 1942: Lake Atitidn, January 31, 1947; marshes adjacent to the Chiquimlilla 
Canal, 120, January 29, 1947. 
In literature it has been recorded from: Duefias, Huamachal (Salvin and Godman). 
Habits and Hunting.--See the general discussion on waterfowl. 
15. Aythya valisineria (Wilson) 
Canvasback | 
Other Names.-- 
Guatemalan: pato espalda blanca, pato espalda canamo 
English: canvasback 
Status.--The canvasback is evidently a rare migrant or winter visitant to lakes and the 
deeper coastal lagoons. 
ri .--A large duck with dark, elongated bill and head, ite sloping profile almost 
a straight line. In flight the long bill, head and neck give the bird a "front-heavy" 
appearance. 
Adult male.--Mostly white, with a reddish brown head and neck, blackish crown 
and chin, black breast and tail; white underparts except lower breast very finely barred 
with black; upper and under tail coverte black; bill blackish, iris red, legs and feet 
bluish, webs darker. In flight, the back and most of wing area white. 
Adult female.--Same characteristic profile and flight outline as male. General 
coloration brown: head, neck and chest reddish brown, belly whitish. 
Measurements.-- 
Length, 508,0-609.6 
Wingspread, 863.6-914.4 
Wing, 215.9-241.3 
Tail, 58.4-86.4 
Tarsus, 40.6-45.7 
Culmen, 53.3-68. 6 
31 
