332 EXPLANATION OF PLATES. 



Plate 26. 



Upper: Nest and eggs of ring-billed gull, Prince William Sopnd, Alaska, June, 

 1912, a photograph presented by Mr. George 6. Cantwell, referred to on 

 page 135. 



Lower: Nest and young of same, Big Stick Lake, Saskatchewan, June 14, 1906. 



Plate 27. 



Upper : Nesting site of short-billed gull, Lake Athabaska, Saskatchewan, June 



27, 1914. 

 Lower: Nest and egg in above locality. Both photographs presented by Mr. 



Francis Harper and published by courtesy of the Geological Survey of 



Canada. 



Plate 28. 



Upper: Nesting site of short-billed gull, St. Michael, Alaska, June 19, 1915, 



referred to on page 141. 

 Lower: Nest, egg, and young of same in above locality. Both photographs 



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



Plate 29. 



Upper: Nesting colony of Heermann's gulls, Udefonso Island, Lower Cali- 

 fornia, March 23, 1909, referred to on page 148. 



Lower: Another view in same colony April 8, 1909. Both from photographs 

 taken by Mr. W. W. Brown for Col. John E. Thayer ; published by courtesy of 

 The Condor. 



Plate 30. 



Upper: Nest and eggs of laughing gull, Muskeget Island, Massachusetts, June 



22, 1902, referred to on page 155. 

 Lower : Nest and young of same In above locality, July 4, 1904. 



Plate 31. 



Upper: Young laughing gull, hiding in grass, Muskeget Island, Massachusetts. 



August 3, 1916, referred to on page 158. 

 Lower: Young laughing gull, just prior to flight stage, same locality, August 4, 



1916 ; a photograph presented by Dr. Alfred O. Gross. 



Plate 32. 



Upper : Pair of laughing gulls at the nest, Louisiana, June, 1908 ; a photograph 



presented by Mr. Herbert K. Job. 

 Lower: Laughing gull on its nest, Louisiana; a photograph presented by Mr. 



Alfred M. Bailey. 



Plate 33. 



Upper : Nesting colony of Franklin's gulls, Lake of the Narrrows, Saskatche- 

 wan, June 9, 1905, a photograph presented by Mr. Herbert K. Job. 

 Lower : Gull alighting on nest In above colony, referred to on page 164. 



