254. Sterna fuliginosa.
THE SOOTY OCEAN-TERN.
Male 17 3/4" Female 16". Legs purplish. Bill purplish. Lores black. Middle claw much curved. Forehead, chin, neck below, axillaries, wing-lining, and lower tail-coverts white. Nape velvet-black. Mantle deep black. Tail sooty, outer feathers dull white, with grey on inner web. Tropical and subtropical seas. Eggs (1.94 x 1.34) whitish, spotted red-brown. (B. 1514.)
Also S. lunata. 15". Legs reddish black. Bill black. Crown, nape, and loral stripe black. Centre of forehead and eye-streak white. Mantle and tail-coverts dark slate-grey. Primaries with brown shafts. Below white. Low Archipelago and Pacific isles.
S. aleutica. 13 1/2". Legs and bill black. Mantle slate-grey. Rump and tail white. Breast and abdomen slate-grey. Shafts of primaries white. Alaska to S. E. Japan.
Also the genus Noenia. With conspicuously prolonged plumes at the gape. Tail slightly forked, with the two outer rectrices equal. One species— N. inca, 16". Legs red. Bill crimson. Forehead and crown dark slate. A white moustache prolonged to the auricles and thence detached in curling feathers about 2" long. Mantle and tail slate, outer rectrices brown. Coasts of Peru and Chili.
(iii.) Outer tail-feather shorter than the next one (255-257).