Genus— CYMOCHOREA Coues. 
1864. Cymochorea Coues, Proc. Acad. Nat. Sci. 
Philad., 1864, p. 75, No. 2, March and 
April—June 30th, Orthotype .. .. .. Procellaria leucorhoa Vieillot. 
One of the “ Swallow Petrels ” with long wings and short legs ; small, com¬ 
pressed, strongly hooked bill; the nasal tubes about half the length of the 
whole bill, height at the base about equal to, or a trifle more than, the width; 
inter-ramal space feathered ; first primary pointed and shorter than the second 
and third, but larger than the fourth ; second primary longest; tail strongly 
forked ; tarsus one and a hah times the length of the culmen; wing about twice 
the length of the tail, colour sooty with or without a white rump ( leucorhoa ). 
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