Sterna caspia, Pall.
982. :- Jerdon's Birds of India, Vol. II, p. 855 ; Butler, Deccan ; Stray Feathers, Vol. IX, p. 439 ; Murray's Vertebrate Zoology of Sind, p. 322.
THE CASPIAN TERN.
Length, 18 to 20; expanse, 49 ; wing, 16 ; tail, 4.5 to 5 ; tarsus, 1.75 ; bill at front, 2.75.
Bill coral red; irides brown ; legs and feet black.
In summer, head above, nape, and ear-coverts, pure black; mantle, wings, and tail, pearl-grey ; some of the first primaries dark-edged and tipped; back of neck and lower plumage white.
In winter, the head is white, the occiput marked with numerous black streaks.
The Caspian Tern is not uncommon during the cold weather on the Sind coast; it is much less common further south, but 'extends as far as Bombay, whence Mr. Hume records a specimen.
It is also found inland on some of the larger lakes and jheels.