== 
all periods. In Illinois, there were marked fluctuations in the 
sex ratio during the seasone 
In Missouri, sample sex ratios of adult mallards remained 
rather uniform throughout the entire season, and there were no 
large fluctuations. 
In Arkansas, marked changes in proportions of the sexes occurred 
during the season. During the period of November 30 through December 11, 
males predominated slightly. The proportion of males increased in 
the period of December 12 through January 1, until there were more 
than two adult males for each adult female. During the last week of 
the season, January 2 through 8, there appeared to be a reduction in 
the proportion of males. 
In Tennessee, the proportion of males was somewhat lower early 
in the season than it was after December 7. However, sample sizes 
were very small. 
In the small Louisiana sample of mallards, adult sex ratios 
suggested that adult females made up a greater part of the bag 
after December 15. 
American Widgeon 
Sex ratio data for adult American widgeon (Table 57) suggest 
differences between the eastern States and the western States. The 
differences are similar to those suggested by the age ratio data 
(Table 40). In the sample from the western States, numbers of males 
and females were approximately equal, while in the samples from the 
eastern States there were proportionally more males than females. 
Green-winged Teal 
Table 53 indicates that in the samples of adult green-winged 
teal, there usually were more females than males and that in the 
samples of immatures the séxes were essentially equal. Although 
the sample sizes Were very small, the data suggest that there were 
more adult males than females in greenwing wintering areas such as 
Arkansas, but that in most other areas females predominated. 
Blue-winged Teal 
In samples of adult blue-winged teal, females greatly out- 
numbered males. Females also outnumbered males in the sample of 
immatures,but the difference was not so greats In Minnesota, the 
most important bluewing harvest area, numbers of immature males 
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