CATALOGUE. 6 1 



Although there appears to be a constant difference in 

 size,* yet it will be seen by the preceding list that specimens 

 of the same species differ as much in size as the so-called 

 var. Virginicus differs from Charadrius fulvus. 



63. ^GI A LITIS SEMIPALMATUS, {_Bp.) Cab. 



(RiNGNECK.) 



An abundant species during the migrations. Some prob- 

 ably breed, as I found it common in July. 



64. ^GI A LITIS MELODUS var. CIRCUMCINTA, Ridg. 

 (Piping Plover.) 



An abundant species. I procured immature birds in July, 

 and Mr. Perham found it breeding in June. This, I believe, 

 is the most northern record of its capture, but future 

 research, I think, will reveal that it has a much more 

 northern range than naturalists generally suppose. Dur- 



* Not greater than would be caused by climatic influences and geographical dis- 

 tribution. 



