28 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



The results of an examination of a series of adults from 

 the Galapagos Islands may be summarized as follows : 



A pair taken on Hood Island in latter September, 1905, seem 

 to be just completing a moult which has involved the entire 

 plumage. I cannot say whether it is prenuptial or postnuptial. 



Eight specimens taken at Brattle Island on October 30, 

 show, in the majority of cases, some feather-renewal about the 

 head, back, and breast. The primaries and rectrices in all 

 show varying degrees of wear. Apparently a moult is begin- 

 ning, and it is likely that it is prenuptial, since the species has 

 been found breeding on other southern and central islands in 

 January and February. To six November specimens taken at 

 Indefatigable and Daphne islands the same remarks are ap- 

 plicable. In one a new lateral rectrix is appearing. 



A male from Duncan Island, December 6, shows no feather- 

 growth and very little abrasion. 



Fourteen January specimens, one from James Island and 

 thirteen from Indefatigable, are evidently in nuptial plumage, 

 and show no signs of feather-growth except in three specimens 

 from Indefatigable. One is evidently a brooding male, and 

 shows two new feathers appearing in the anterior part of the 

 abdominal region; a second shows a new tail-feather and one 

 or two new interscapulars; while in the third specimen the 

 moult has gained considerable headway in the ventral tract. 



A male from Hood Island, February 1, is evidently in 

 nuptial dress. 



On March 20 eleven adults were taken at Iguana Cove, 

 Albemarle Island. All are in fairly fresh plumage, about 

 half of them showing no pin-feathers. Of those with pin- 

 feathers, two or three are getting new inner primaries. 



A male from Tagus Cove, captured March 24, shows re- 

 newal of the primaries, rectrices, lesser wing-coverts, and body- 

 plumage. 



Nineteen examples from Tagus Cove, shot during the first 

 half of April, show the postnuptial moult under way, and in- 

 volving in most instances the wings as well as the body- 

 plumage. 



A female from south Albemarle, April 28, is undergoing a 

 moult of the body-plumage, probably postnuptial. All but the 

 two outer primaries of each wing have been renewed. A fe- 



