EXPLANATION OF PLATES. 335 



Plate 53. 



Upper: Young common terns, recently hatched, Chatham, Massachusetts, June 



29, 1916. 

 Lower: Older young of same, Muskeget Island, Massachusetts, July 4, 1903. 



Plate 54. 



Upper : Common tern on its nest, Chatham, Massachusetts, June 13, 1919. 

 Lower : Nesting colony of same in above locality, same date. 



Plate 55. 



Upper: Nest and eggs of arctic tern, Chatham, Massachusetts, June 29, 1916. 

 Lower: Another nest of same, Yukon Delta, Alaska, June 19, 1914, from nega- 

 tive taken by Mr. F. S. Hersey for the author. 



Plate 56. 



Upper: Arctic tern at its nest, Matinicus Rock, Maine, July, 1906. 

 Lower: Another nest of same in above locality. Both photographs presented 

 by Mr. Herbert K. Job. 



Plate 57. 



Upper: Young arctic terns, recently hatched, Chatham, Massachusetts, June 

 29, 1916. 



Lower: Two older young of same Matinicus Rock, Maine, July, 1906, a photo- 

 graph presented by Mr. Herbert K. Job. 



Plate 58. 



Upper: Nests and eggs of roseate tern, Muskeget Island, Massachusetts, June 



22, 1902. 

 Lower: Another nest of same in above locality, referred to on page 257. 



Plate 59. 



Upper: Nesting colony of roseate terns, Muskeget Island, Massachusetts, June 



10, 1919, referred to on page 257. 

 Lower: Roseate tern on its nest, above locality and date. 



Plate 60. 



Upper: Roseate tern and young, Weepecket Island, Massachusetts, July 1, 1919. 

 Lower: Roseate tern, same locality and date. 



Plate 61. 



Upper: Young roseate tern, about 5 days old, Dry Tortugas, Florida. 

 Lower : Young roseate tern, about 8 weeks old, same locality. Both from pho- 

 tographs taken by Dr. Paul Bartsch. 



Plate 62. 



Upper: Nest and eggs of Aleutian tern, Saint Michael, Alaska, June 23, 1915, 



referred to on page 266. 

 Lower: Nearer view of same nest. Both from negatives taken by Mr. F. S. 



Hersey for the author. 



