further records, and remain content with the assurance 

 that this Gull has been met with on our coasts on more 

 than one occasion besides those above specified. There 

 is, however, no doubt that many mistakes have arisen 

 from the close resemblance of the present species in 

 immature plumage to our common mis-named Black- 

 headed Gull. Bonaparte's Gull is somewhat smaller 

 than the last-named, and, according to the editor from 

 whom I have above quoted, may be distinguished in all 

 stages by the white margins to the inner webs of the 

 outer primaries. As I know nothing whatever about 

 this bird from personal experience or observation, I will 

 only add that I gather from the authors quoted in 

 ' Yarrell,' loc. supra cit., that it visits the Atlantic coasts 

 of the North-eastern United States in great numbers in 

 April and May, and again in autumn, that its breeding- 

 grounds extend over (he greater part of Arctic America, 

 that it nests in colonies, generally building on trees, and 

 that its habits very closely resemble those of the other 

 species above mentioned. In winter it is said to be 

 abundant on the coast of Florida. It is not known to 

 breed within the boundaries of the United States. 



