Birds of Pennsylvania, 233 



40. Anas obscura Gmel. 



Black Duck. 133. Spring and fall migrant; 



41. A. strepera Linn. 



Gadwall. 135. Spring and fall migrant 



42. A, americana Gmel. 



Baldpate. 137. Spring and fall migrant 



43. A. carolinensis Gmelin. 



Green-winged Teal. 139. Rather common spring and fall znigranti 



44. A. discors Linn. 



Blue-winged Teal. 140. Spring and fall migrant 



45. Spatula clypeata (Linn.). 



Shoveller. 142. Spring and fall migrant rather rare. 



46. Dafila acuta (Linn.). 



Pintail. 143. Spring and fall migrant 



47. *Aix S2ionsa (Linn.). 



Wood Duck. 144.. Rarely seen in winter. 



48. Aythya americana (Eyt). 



Redhead. 14G. Winter visitant 



49. A. vallisneria (Wils. ). 



Canvas-back. 147. Winter visitant 



50. 4. mania nearctica Stejn. 



American Scaup Duck. 148. Autumn and winter visitant. 

 5L A. affinin (Eyt). 



Lesser Scaup Duck. 149. Frequent winter visitant 



62. A. collaris (Donov. ). 



Ring-necked Duck. 150. Spring and fall migrant 



63. Olaucionelta clangula americana (Bonap. ). 



American Golden-eye. 151. Winter visitant 



54. Charitonetta albeola (Linn.). 



Buftle-head. 153. Common winter resident 



55. Clangula hyemalis (lAnn.). 



Old-squaw. 154. Rare winter visitant 

 66. Somaieria dresseri Sharpe. 



American Eider. IGO. Very rare winter visitant If there is no mistake 

 a bird of this species was taken near Chadd's Ford, Delaware county, in 

 the winter of 1886.—^. M. Everhart. 

 57. Oidemia americana Sw. <fe Rich. 



American Scoter. 163. Occasional Avinter visitant 



68. O. deglandi Bonap. 



White-winged Scoter. 165. Very rare winter visitant about our rivers, 

 probably more frequent on Lake Erie. 



69. O. perspicillala {L.\i\n.). 



Surf Scoter. 166. Rare winter visitant 

 60. Erismalurarubida iyaXa.). 



Ruddy Duck. 167. Common winter resident 

 6L Branta canadensis (Linn.). 



Canada Goose. 172. Common spring and tall migrant 

 62. OloT columbianus (Ord. ). 



Whistling Swan. 180. Casual spring and winter visitor. 



