332 BULLETIN 121, UNITED STATES NATIONAL MUSEUM. 



Plate 26. 



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

 Lower: Young of same, sixty days old. Both 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. RoUo H. 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-fa(*ed booby feediflg 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. RoUo H. Beck. 



Plate 32. 



Upper: Boobies on the wing. 



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



photographs by Dr. Frank M. 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. Frank M. 



Chapman, on Cay Verde, Baharia Islands, and presented by tlie American 



Museum of Natural History. 



Plate 34. 



Upper : Red-footed booby alighting on its nest, Laysan Island, Pacific Ocean, a 

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



