MONOGRAPH OF THE PETRELS. 



white, feathers in front of and below the eye black, extending over the ear-coverts, which 

 have a few white streaks ; cheeks and entire under-surface pure white, including the 

 under wing-coverts and axillaries ; edge of the wing slightly mottled with black spots ; 

 on the lower flanks above the thighs, a patch of feathers with broad black tips ; quills 

 blackish below, white for the greater part of the inner webs, which are more or less 

 shaded with grey ; bill black ; tarsi and base of toes, yellow in skin, the terminal half 

 black. Total length about 15.5 inches ; culmen, 1.4 ; wing, 11.5 ; tail, 4.7 ; tarsus, 

 1.4 ; middle toe and claw, 1.9. 



A young bird still more or less covered with long ashy down, but showing feathers 

 beneath it, is somewhat whiter on the under-parts. The plumage of the nestling seems 

 to be very like that of the adult. 



The description and figure in the Plate are taken from the type-specimen. 



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