No. 54. 



Arenaria interpres. 



Adult male. Head, neck, and breast broadly pied black and 

 white ; much of the upper plumage blotched conspicuously with 

 mahogany color and black; the back (under the overlaying 

 feathers of wings and shoulder region) white, with a blackish 

 patch upon the rump ; the tail, showing a blackish field, skirted 



No. 54. Adult. 



unevenly with white. Under parts white (from the black of the 

 breast backward), and a bar of white crossing wing. Bill nearly 

 black. Legs and toes rich orange red. 



Adult female. Similar to adult male, but with the mahogany 

 color and black less positive. 



