ORDER ANSERES. 53 



[6591,0503, R618, C723.] 



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

 Michigan, and Maine northward. 



147. Aythya vallisneria (Wils.). 



Canvas-back. 



Anas vallisneria Wilson, Am. Orn. VIII. 18 14, 103. 

 Ayihya vallisneria 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 FULIGULA Stephens. 



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

 elimination. Anas fuligula Linn. 



148. Aythya marila nearctica Stejn. 



American Scaup Duck. 



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



[B 588, C 500, R614, C 720.] 



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

 winter to Guatemala. 



149. Aythya affinis (Eyt.). 



JLesser Scaup Duck. 



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



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



[B 589, C 501, R 615, C721.] 



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 collaris Ridgw. Pr. U. S. Nat. Mus. VIII. 1885, 356. 



