ORDER ANSERES. 53 
[Bsotpeisas, 8h. O18, C723. 
Groc. Dist.— North America, breeding from California, southern 
Michigan, and Maine northward. 
147. Aythya vallisneria (WIts.). 
Canvas-back. 
Anas vallisneria Wiuson, Am. Orn. VIII. 1814, 103. 
Aythya vallisneria Bot, Isis, 1826, 980. 
[B 592, C 504, R 617, C 724.] 
Groc. Dist.— Nearly all of North America, breeding from the 
northwestern States northward to Alaska. 
SuBGENUS FULIGULA STEPHENS. 
Fuligula StepuEns, Gen. Zool. XII. pt. ii. 1824, 187. Type, by 
elimination, Anas fuligula LINN. 
148. Aythya marila nearctica STEJN. 
American Scaup Duck. 
Aythya marila nearctica StE}N. Orn. Expl. Kamtsch. 1885, 161. 
[B 588, C 500, R 614, C 720.] 
Groc. Dist.— North America, breeding far north. South in 
winter to Guatemala. 
149. Aythya affinis (Eyr.). 
Lesser Scaup Duck. 
Fuligula afinis Eyt. Mon. Anat. 1838, 157. 
Aythya afinis Steyn. Orn. Expl. Kamtsch. 1885, 161. 
[B 589, C 501, R 615, C et ea| 
Groc. Dist.— North America in general, breeding chiefly north 
of the United States, migrating south to Guatemala and the West 
Indies. 
150. Aythya collaris (Donov.). 
Ring-necked Duck. 
Anas collaris Donov. Br. Birds, VI. 1809, pl. 147. 
Aythya collaris Ripew. Pr. U. S. Nat. Mus. VIII. 1885, 350% 
