332 BUXLETIN 121, UNITED STATES NATIONAL MUSEUM. 



Plate 26. 



Upper: Young yellow billed tropic-bird, tbirty-four days old. 

 Lower: Young of same, sixty days old. Botb photographs presented by Dr. 

 Alfred O. Gross and referred to on page 184. 



Plate 27. 



Upper : Red-billed tropic-bird on its nest, Isabella Island, Mexico, April 9, 



1905, a photograph presented by Mr. Harold H. Bailey. 

 Lower: Red-billed tropic-bird on its nest, Galapagos Islands, a photograph 



presented by Mr. Rollo 11. Beck. 



Plate 28. 



Upper : Red-tailed tropic-bird on its nest, Laysan Island, Pacific Ocean, a 



photograph presented by Dr. Walter K. Fisher. 

 Lower: Red-tailed tropic-bird and young, Laysan Island, a photograph by 



Mr. C. T. Albrecht, presented by the Biological Survey. 



Plate 29. 



Upper: Blue- faced booby, guarding eggs. 



Lower : Blue-faced booby, brooding young. Both photographs taken on Lay- 

 san Island, Pacific Ocean, and presented by Dr. Walter K. Fisher. 



Plate 30. 



Upper : Pair of blue-faced boobies guarding young. 



Lower: Blue-faced booby feeding young. Both photographs taken on Laysan 

 Island, Pacific Ocean, and presented by Dr. Walter K. Fisher. 



Plate 31. 



Upper: Blue-footed booby and egg, Galapagos Islands. 



Lower: Blue-footed booby and young, Galapagos Islands. Both photographs 

 presented by Mr. Rollo H. Beck. 



Plate 32. 



Upper : Boobies on the wing. 



Lower: Booby colony, adults and young, Cay Verde, Bahama Islands. Both 



photographs by Dr. Frank ]\I. Chapman, presented by the American Museum 



of Natural History. 



Plate 33. 



Upper : Booby, nest, and eggs. 



Lower : Pair of boobies and young. Both photographs taken by Dr. P'rank M. 



Chapman, on Cay Verde, Bahnria Islands, and presented by the American 



Mu.sieum of Natural History. 



Plate M. 



Upper: Red-footed bo(»by alighting on its nest, Laysan Island, Pacific Ocean, a 

 photogra))h by Mr. C. T. Albrecht, presented by the Biological Survey. 



