P H. NieRIPENNIS 



SEPTEMER 1964 



OCTOBER 196-4 



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Figure 7b. — Distribution of Black-winged Petrel, September-December 196A. 



the study area. Owing to the similarity of 

 this species to Pterodroma hypoleuca , it was 

 probably overlooked in other months. If it mi- 

 grates through the area it would probably be 

 expected in October, November. May, and June 

 on its way to and from its breeding grounds in 

 the Southern Hemisphere. 



18 



