252. Sterna melanauchen.
THE BLACK-NAPED OCEAN-TERN.
Male 12" to 13 1/2". Legs black. Bill black, red tip. Head white, nape, orbits, and ear-coverts black. Eye-line widening to nape black. Mantle pale grey. Wing almost white. First quill dark grey on outer web; shafts of all primaries white. Outer rectrices white. Chiefly insular throughout tropical parts of Indian Ocean, the Malay Archipelago, and N. Australia, the Loochoo, Friendly, and Navigator groups. Two eggs (1.56 x 1.12), yellowish and double-spotted. (J, 991. B. 1512.)
Also S. trudeau. 14". Legs dull orange. Bill yellow, banded black. Grown and nape white, merely a blackish streak through the eye. Above and below grey. Chin and rump white. S. America.
Crown and lores black.