ORDER ANSERES. 53 



[B 591, C 503, R 618, C 723.] 



Geog. Dist. — North America, breeding from California, southern 

 Michigan, and Maine northward. 



147. Aythya vaUisneria (Wils.). 



Canvas-back. 



Anas vaUisneria Wilson, Am. Orn. VIII. 1814, 103. 

 Aythya vaUisneria Boie, Isis, 1826, 980. 



[B 592, C 504, R617, C 724.] 



Geog. Dist. — Nearly all of North America, breeding from the 

 northwestern States northward to Alaska. 



Subgenus PULIGTJLA Stephens. 



FuUgula Stephens, Gen. Zool. XII. pt. ii. 1824, 187. Type, by 

 elimination, AnasfuUgula Linn. 



148. Aythya marila nearctica Stejn. 



American Scaup Duck. 



Aythya marila nearctica Stejn. Orn. Expl. Kamtsch. 1885, 161. 



[B 588, C 500, R 614, C 720.] 



Geog. Dist. — North America, breeding far north. South in 

 winter to Guatemala. 



149. Aythya affinis (Eyt.). 



Lesser Scaup Duck. 



FuUgula affinis Eyt. Mon. Anat. 1838, 157. 



Aythya affinis Stejn. Orn. Expl. Kamtsch. 1885, 161. 



[B 589, C SOI, R 61s, C721.J 



Geog. Dist. — North America in general, breeding chiefly north 

 of the United States, migrating south to Guatemala and the West 

 Indies. 



150. Aythya coUaris (Donov.). 



Ring-necked Duck. 



Anas collaris Donov. Br. Birds, VI. 1809, pi. 147. 



Aythya coUaris Ridgw. Pr. U. S. Nat. Mus. VIII. 1885, 356. 



