MONOGRAPH OF THE PETRELS. 



sun has done its work, the rich brown fades and a pale buff colour takes its place. 

 During the autumn moult in January and February, the birds assume a mottled 

 plumage, and the dark feathers gradually emerge from the faded ones. For further 

 notes on this subject see Mr. Eagle Clarke's paper on the birds of the Scottish Expedition 

 (Ibis, 1907, p. 334). 



The male described was procured by Dr. E. A. Wilson off the Balleny Islands on 

 the 2nd of March, 1904, and the female off Cape Adare on the 11th of January, 1902, 

 during the voyage of the " Discovery." The figure is drawn from the specimen in our 

 collection from Cape Horn (sp. a of Salvin's Catalogue of Birds) which is in freshly 

 moulted plumage. 



164 



