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



siderable number of pin-feathers in the body plumage. It is 

 perhaps completing its prenuptial moult, or possibly starting 

 on its postnuptial. 



Four January birds, three from Indefatigable Island and one 

 from Hood, are in all likelihood beginning the postnuptial 

 moult. All show pin-feathers and newly-expanded feathers 

 in the body, and one shows new inner rectrices. 



Two specimens from Hood Island and three from Chat- 

 ham were taken during February. All show a moult in prog- 

 ress, and in one case the primaries have been renewed in 

 part. Undoubtedly these birds were engaged in the post- 

 nuptial moult. The sexual organs of two of the specimens, 

 obtained on February 14, were noted as small. 



In addition to the young one shot on Narborough Island on 

 March 22, a female (No. 1914) in worn plumage was se- 

 cured. This bird showed the renewal of the body-plumage to 

 be taking place. It was in practically the same state as the 

 two adults taken on Flood Island on February 1, while the 

 young one was of about the same age as the two young taken 

 on Hood on February 1. This would seem to indicate a later 

 breeding-season on Narborough than on Hood, or at least an 

 extended breeding-season. No. 1925, Tagus Cove, Albemarle 

 Island, March 29, is in the same stage as No. 1914. 



A gap of nearly four months occurs in the dates of the series, 

 the next specimens being five July adults from Indefatigable 

 and Seymour islands. All show pin-feathers. Three are in 

 fresh plumage: one with full-grown primaries, one with the 

 distal primary growing, and one with it not yet renewed. A 

 fourth specimen has worn feathers in the wings, tail, etc., and 

 has only the two inner primaries new. The fifth bird has 

 many worn feathers in the wings and interscapular region, 

 and shows only the proximal primary and a central rectrix 

 new. 



A male and a female from James Island, taken on July 28 

 and August 3, respectively, are in the midst of a moult involv- 

 ing body, wings, and tail. Five individuals from Tower, 

 Bindloe, and Abingdon islands, secured from the 15th to the 

 18th of September, 1906, are in the last stages of a moult in- 

 volving the entire plumage. It is impossible to say whether 



