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" fail migrant* 



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 sponsa (Linn.). 



Wood Duck. 144.. Rarely seen in winter. 



48. Ay thy a americana (Eyt). 



Redhead. 14G. Winter visitant 



49. A. vallisneria (Wils.). 



Canvas-back. 147. Winter visitant 

 60. 4. mania ncarclica 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. Glaucionetla clangula americana (Bonap.). 



American Golden-eye. 151. Winter visitant 



64. Charitonetta albcola (Linn.). 



Buflie-head. 153. Common winter resident 



66. Clangula hyemalis (Linn.). 



Old-squaw. 154. Rare winter visitant 

 6& Somateria dresseri Sharpe. 



American Eider. 1GO. 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 18S6. #. M. Ever hart. 



67. Oidemia americana Sw. <fe Rich. 



American Scoter. 163. Occasional winter 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 (Linn. ). 



Surf Scoter. 166. Rare winter visitant 

 60. Erismaturarubida (Wils.). 



Ruddy Duck. 167. Common winter resident 

 6L Branta canadensis (Linn.). 



Canada Goose. 172. Common spring and fall migrant 

 62. Olor columbianus (Ord. ). 



Whistling Swan. 180. Casual spring and winter visitor. 



