MONOGRAPH OF THE PETRELS. 



Dr. Knud Andersen, of Darlmenats, says a specimen was obtained on the ice in 

 the North Atlantic in April 1834, at Fiskumvand, Eker, Norway, about 59° 50 ' N. Lat., 

 and was sent by Professor W. Bceck to the Christiania Museum, and determined by 

 Professor Collett. It had previously been wrongly identified with T. chlororhynchus. 



Gould relates that the habits and food of this species are similar to those of its 

 congeners. 



Adult female. — General colour above slaty-brown, the feathers with scarcely 

 perceptible margins of lighter brown, the long scapulars blackish towards the ends ; 

 mantle paler than the back, being light ashy-grey ; lower back, rump, and upper 

 tail-coverts pure white ; wings darker than the back, with a slaty-gloss, 

 especially on the secondaries, which have the inner, and often the outer webs, for 

 the most part white ; the outer primaries with yellowish-white shafts ; tail-feathers 

 dull slate-colour, the outer ones blackish on the outer webs, all having white 

 shafts; crown of head, sides of face and throat delicate bluish-grey, paler on the 

 forehead and hind-neck, and thence over the upper mantle ; remainder of under- 

 surface, from the lower throat downwards, pure white ; axillaries and under wing- 

 coverts pure white, with a broad black band of small coverts round the bend of the 

 wings ; quills blackish below, more ashy on the inner webs ; " bill black, the culmen 

 yellow with the tip pink ; lower half of the under-mandible yellow ochre ; feet and legs 

 grey ; webs fleshy pink ; nails yellowish horn colour " (E. A. Wilson). Total length, 

 28 inches, culmen, 4.25; wing, 18.8 ; tail, 7.4; tarsus, 3.0; middle toe and claw, 4.75. 



The colour of the bill and feet is variously given, and the following note of 

 Professor Giglioli describes the bill as "black, the culmen and tip of the upper 

 mandible and the edges of the rami of the lower mandible of a clear yellow, the 

 tarsi and feet of a greyish flesh-colour, the interdigital membranes yellowish ; iris 

 brown." Mr. Nikolai Hanson's notes were as follows : — " Bill black, with a yellow 

 edge above and below, the tip red ; feet and webs fleshy-grey ; iris light brown." 

 Commander Ayscough has given the colours as follows : — " Bill black ; feet pale 

 bluish- white ; webs white ; joints of toes light blue." Dr. E. A. Wilson describes a 

 female which he captured on December 29th, 1901, as having " the bill black ; culmen 

 yellow with pink tip ; basal half of lower mandible yellow ochre ; feet and legs grey ; 

 webs fleshy pink ; claws yellowish horn colour." Gould states that the " bill is black, 

 with the exception of the culmen and tip, and the lower edge of the basal 

 three-fourths of the under-mandible, which are horn-colour." 



The description is taken from a specimen in the British Museum, obtained by 

 Dr. E. A. Wilson during the voyage of the " Discovery " in Lat. 56° 54' S., Long. 17° E. 



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