and immature females were essentially equal. Adult male blue-winged 
teal apparently migrate from the Flyway before the hunting season 
Opens. Because adult males are poorly represented in the bag, age 
ratios contain a bias that is not present among most other species. 
Pintail 
There were more males than females in the samples of immature 
pintails (Table 53). In the Minnesota sample, there were 45 males 
but only 22 females. This difference was a statistically significant 
departure at the 0.05 probability level from a 50:50 ratio. Although 
Samples were very small, there apparently were regional differences 
in the sex ratios of adult pintails (Table 58). In the northern tier 
of States (Minnesota, Wisconsin, and Michigan), there were many more 
adult females than males in the sample. At the southern end of the 
Flyway, in Louisiana, the sample contained many more adult males than 
adult females. Throughout the remainder of the Flyway, the numbers 
of males and females were nearly equal. Smith (1960) also reported 
a larger proportion of adult males than‘females in a sample of 96 
adult pintails in hunters‘ bags in Louisiana. The ratio was 317 
males per 100 females. 
Wood Duck 
More males than females of both immature and adult wood ducks 
were found in the wing-collection sample. Because wood-duck age 
ratios (Table 48) were higher in the northern States than in the 
more southern States, sex ratio data for adults were grouped similarly 
to see if there were differences (Table 59). These data suggested 
little variation in wood-duck sex ratios between northern and 
southern States. 
Lesser Scaup 
Sex ratios of adult lesser scaup in the samples from Minnesota, 
Wisconsin, Michigan, and Ohio were markedly different from the ratios 
in the remainder of the Flyway (Table 60). The sex ratio was 96 
adult males per 100 adult females in the northern States, while in 
the southern States it was 236 adult males per 100 adult females. In 
Louisiana bag checks made during the 1959-60 season, Smith (1960) found 
247 adult males per 100 adult females in a sample of 371 birds. 
-36- 
