Genus-S TERCORARIUS. 
Stercorarius Schaeffer, Mus. Ornith., p. 62, 1789 . . 
Lestris lUiger, Prodromus, p. 272, 1811 
Proedatrix Vieillot, Analyse, p. 65, 1816 
Oceanus Koch, Syst. baier. Vogel, p. 380, 1816 
Type S. 'parasiticus. 
Type S. parasiticus. 
Type S. parasiticus. 
Type 8. parasiticus. 
This genus is recognised in the A.O.U. Checklist^ 3rd ed., 1910, as including 
L. pomarinus Temminck and 8. longicaudus Vieillot in addition to the type- 
species ; the former I consider more closely related to members of the genus 
Catharacta, and to the latter I would certainly give subgeneric rank. However, 
there would be no name available, as Lestris Reichenbach, 1852, is preoccupied 
by Lestris Illiger, 1811. I therefore propose the new subgeneric name 
ATALOLESTRIS with type 8tercorarius longicaudus Vieillot. It is well 
characterised by its delicate form and very elongated central tail-feathers 
which make the tail longer than the wing. 
The two species I restrict to the genus 8tercorarius are small Skuas with 
slender bills, weak legs and feet (comparatively), long wings, and very long 
central tail-feathers, acuminate, and attentuated into long streamers in the 
subgenus Atalolestris. In the subgenus 8tercorarius the tail does not exceed 
the wing, but is about equal to it. 
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