MONOGRAPH OF THE PETRELS. 



coverts like the back, and having the same obsolete shade of slaty-grey ; quills blackish- 

 brown, more or less white towards the base ; the primaries with white shafts for a 

 great part of their length, especially on the outer feathers, which show a great extent 

 of white along their inner web ; tail-feathers blackish, white at the base, like the 

 adjoining upper tail-coverts ; crown of head like the back, showing similar white bases 

 to the feathers, when disturbed ; lores and base of forehead, as well as the sides of the 

 face, dusky-brown, but more distinctly shaded with slaty-grey ; under the eye a line of 

 white ; entire under-surface of body brown, washed with slaty-grey, the under tail- 

 coverts blacker, and having white bases like the tail-feathers ; under wing-coverts and 

 axillaries dark brown ; quills blackish-brown below, with the inner web white for 

 two-thirds of its length, the secondaries also with concealed white bases ; " bill and 

 legs black" (Buller). Total length about 14.5 inches; culmen, 1.2; wing, 11.0; 

 tail, 4.0 ; tarsus, 1.45 ; middle toe and claw, 2.0. 



Adult (white phase : = (E. leucophrys, Hutton). General colour above dark 

 brown, much mottled with white bases to the feathers, which have evident margins of 

 paler ashy-brown ; the longer scapulars blackish, like the inner secondaries ; wing- 

 coverts dark brown like the back, and having obsolete margins of paler brown ; quills 

 blackish, white at the base and for a great extent of the inner webs of the primaries, 

 which have white shafts for a great part of their extent ; upper tail-coverts and tail- 

 feathers blackish, with white bases ; crown of head and hind-neck much paler than the 

 back, and more mottled, the feathers having brown centres with blackish shaft-lines 

 and hoary- whitish margins, the fore-part of the crown having a spotted appearance ; 

 base of forehead, lores, feathers over the eye and sides of face, pure white, with a shade 

 of brown in front of the eye and towards the sides of the neck ; entire under-surface 

 of body pure white, shaded with ashy-brown on the sides of the neck and chest, the 

 feathers having faint ashy-brown subterminal bands ; across the fore-neck a slight 

 indication of brown shading near the ends of the feathers ; on the sides of the body a 

 slight shade of brown ; under tail-coverts white, either freckled with dark brown 

 towards the ends, or with the terminal third uniform dark brown ; under wing-coverts 

 and axillaries dark brown, the outer greater-coverts and the primary-coverts white 

 towards the base of the inner web ; quills blackish-brown below, white for more than 

 half of the inner webs of the primaries. Total length about 15.5 inches ; culmen, 1.25 ; 

 wing, 11.2 ; tail, 4.0 ; tarsus, 1.5 ; middle toe and claw, 2.2. 



Between the two phases described above, numbers of intermediates occur. 



The specimens described are from the Kermadec Islands, obtained by Mr. 

 Dannefaerd, and now in the Rothschild Collection. The figure represents the fight 

 phase, and is taken from an example procured by Lieut. Macfarlane in the Eastern 

 South Pacific Ocean. 



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