MONOGRAPH OF THE PETRELS. 



The blackish streaks on the side of the body vary in intensity, but are never 

 entirely absent. Sometimes they are very broad, at others they are reduced to hair- 

 like shaft-lines. Occasionally, in addition to streaks, there are black spots on the 

 flank-feathers, which have sometimes sub-terminal bars of black. 



The specimens described are all in the British Museum, the bird figured being 

 one of Macgillivray's from Aneiteum, formerly in our own collection. 



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