EXPLANATION OF PLATES. 



halftone plates. 



Plate 1. 



Group of laughing gulls on beach, Battledore Island, Louisiana, June, 1905, 

 a photograph presented by Mr. Herbert K. Job. (Frontispiece.) 



Plate 2. 



Left: Nest and eggs of skua, Kaldafarnes, Iceland, a photograph presented 

 by Mr. J. Wilkinson. 



Bight : Ppmarine jaeger, , Chatham, Massachusetts, August 81, 1904, a photo- 

 graph presented by Mr. Herbert K. Job. 



Plate 3. 



Upper : Nest and egg of parasitic jaeger, Kolyma Delta, Siberia, June 27, 1917, 

 from a negative taken by Mr. Johan Koren for the author. 



Lower: Nest and eggs of parasitic jaeger, Point Barrow, Alaska, June 25, 

 1917, from a negative taken by Mr. T. L. Richardson for the author. 



Plate 4. 



Upper : Nest and eggs of long-tailed jaeger, St. Michael, Alaska, June 19, 1915, 



from a negative taken by Mr. F. S. Hersey for the author. 

 Lower : A nearer view of the same nest, referred to on page 22. 



Plate 5. 



Upper: Nest and eggs of long-tailed jaeger, Kolyma Delta, Siberia, June 22, 

 1917, from a negative taken by Mr. Johan Koren for the author. 



Lower: Long-tailed jaeger on its nest, northeast Greenland, published by 

 courtesy of Mr. A. L. V. Manniche, Meddelelser om Gr0nland. 



Plate 6. 



Upper : Nesting site of ivory gull, northeast Greenland, July 18, 1908. 

 Lower: Nest in above locality. Both published by courtesy of Mr. A. L. V. 

 Manniche, Meddelelser om Gr0nland. 



Plate 7. 



Left: Kittiwake on its nest, Bird Rock, Quebec, June 25, 1904, a photograph 



presented by Mr. Herbert K. Job. 

 Right: Kittiwakes on their nests, Bird Rock, Quebec, June 24, 1904, referred to 



on page 38. 



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