Sterna bergii, Licht.
989. :- T. cristatus, Steph. :- Jerdon's Birds of India, Vol. II, p. 842 ; Butler, Deccan, Stray Feathers, Vol. IX, p. 441; Murray's Vertebrate Zoology of Sind, p. 322.
THE LARGE SEA TERN.
Length, 17 to 18 ; wing, 13 to 14 ; tail, 7 ; tarsus, 1.25 ; bill at front, 2.5.
Bill pale yellow ; irides dark brown ; legs black.
Head, with the longish occipital crest, deep glossy-black ; forehead, lores, ear-coverts, nape, and all the lower parts silky-white ; back, wings and tail, rather darkish silvery-grey; edge of the wing and tips of the secondaries white; quills dark at the base and tip, hoary or silvery toward the terminal portion, with the inner web and shafts white internally, diminishing in quantity from the first.
The Large Sea Tern is very common at Kurrachee and all along the sea coast. It breeds during April and May, on islands in the Persian Gulf, in company with many other species of Terns. Boat loads of eggs are annually brought into Kurrachee. The eggs are broad ovals, much pointed at one end ; the ground color varies from pale buff to warm salmon color; the markings are of two colors :- dark burnt sienna and pale inky-purple. They measure 2.45 by 1.7.