116 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



and fall migrant; abundant. Often appears in large flocks, settling 

 sometimes in such numbers upon the lake shores as to resemble 

 drifts of snow, when seen from a distance. 



Order ANSERES. Lamellirostral Swimmers. 



Family ANATID/E. Ducks, Geese, and Swans. 



Subfamily MERGIN.E. Mergansers. 



Genus MERGANSER Brisson. 



[B6ii, R 636, C 743, U 129.] 

 Merganser americanus (Cass.). American Merganser. Rather 

 common migrant, frequenting the larger water-courses. 



[B612, R637, C 744, U 130.] 

 Merganser serrator (Linn.). Red-breasted Merganser. Rather 

 rare in all portions of the State, but occasionally taken. 



Genus LOPHODYTES Reichenbach. 



[B613, R 638, C745, U 131.] 

 Lophodytes cucullatus (Linn.). Hooded Merganser. Spring and 

 fall migrant; rather common. Doubtless breeds within the limits of 

 the State. 



Subfamily ANATINiE. River Ducks. 

 Genus ANAS Linn.kus. 



[B 576, R 601, C 707. U 132.] 

 Anas boschas Linn. Mallard. Spring and fall migrant ; very abun- 

 dant. Arrives from the south about the middle of March, returning 

 again the first of October and remaining until the first of December. 

 Breeds in the northern part of the State. 



[B 577, R 602, C 70S, U 1 33-] 

 Anas obscura Gmel. Black Duck. Migratory; not common. Fre- 

 quents the larger lakes and rivers, but seldom seen on the smaller 

 streams. Mr. J. A. Allen, however, states that this species is "not un- 

 common along the rivers and in grassy ponds." 



Subgenus CHAULELASMUS Bonaparte. 



1 13 584, R 604, C711, U 1 35- J 

 Anas strepera Linn. Gadwall. Spring and fall migrant; rather 

 common. Doubtless breeds in northern Iowa, inasmuch as the young 

 have been taken at "the lakes" in August. 



