396 
ANAS CYANOPTERA 
(W. L. Dawson and Bowles, 1909). It is surprising that hybrids between the Cin- 
namon and Blue-wing are not more common. But male hybrids, if there are any, 
would ordinarily pass for young-male Cinnamon Teal with adult plumage half 
developed, and the female hybrids would most certainly never be recognized. 
In the high country westward of Tampico, Mexico, Sanford (Sanford, Bishop and 
Van Dyke, 1903) found them associating with the Green-wing and Blue-wing in 
early spring, but after these had left for the north, the Cinnamon Teal were or- 
dinarily seen with Gadwall and Shovellers. Of course they must associate at times 
with many other surface-feeders, and in the San Joaquin Valley, California, they are 
near neighbors of the Fulvous Tree Ducks. 
In the Rio Negro Province of Argentina, Peters (MS.) saw these Teal usually in 
the company of the other Teal {Anas versicolor and Anas flavirostris) during and 
after the breeding season. Wetmore (MS.) saw one flying with a dock of Chiloe 
Widgeon near General Roca on the Rio Negro. 
So far as I know their eggs are hardly ever mingled with those of other ducks but 
there is a record of one nest found near Brigham City, Utah, and identified by Messrs. 
Treganza and O. M. Lindsay, which contained two Cinnamon Teal eggs, three 
Red-head eggs and two eggs of the Canvas-back (U.S. Biological Survey records) ! 
Voice. The only description of the male’s voice is that given by Wetmore (1920) 
in his account of the breeding birds at Lake Burford, New Mexico. He says it is a 
“low, rattling, chattering note ” audible only for a short distance. The female has a 
weak quacking note, but both sexes are uncommonly silent. 
The tracheal bulb, apparently hitherto undescribed, is in shape a rough ellipsoid, 
measuring 16 to 20 mm. in its longest diameter, and 13 mm. in the minor axis. It 
faces forward and to the left and surrounds the left bronchus. It is interesting to 
notice that this structure is two or three times as large as it is in the Blue-winged 
Teal {Anas discors) besides being rather differently shaped. 
Food. The only exact analysis of the food-habits is that made by the U.S. Bio- 
logical Survey (Mabbott, 1920). Even this comprised the study of only forty-one 
stomachs, taken between March and October, mostly in Utah and California, with 
some from other western States. The vegetable food was in slightly larger propor- 
tion than in the Blue-wing, and comprised nearly 80% of the whole. As in the 
two other North American Teal the principal items of food are the seeds and other 
parts of sedges and pond-weeds. The sedges amounted to 34.27% and the pond- 
weeds to 27.12% of all the food. Plants well represented were the seeds of prairie 
bulrush {Scirpus paludosus), seeds of the true pond-weeds {Potamogeton) and the 
widgeon-grass {Ruppia maritima). One bird had eaten four hundred large seeds of a 
pond-weed, and another nine hundred and fifty seeds of widgeon-grass. The grass 
