other flocks gradually arrive, until at length, on the approach of cold weather, almost all of them begin to move southward. Although the great body of these Plovers pass beyond the limits of the United States, some remain on the shores of the Floridas during winter. In their habits they are more maritime than the Golden Plovers, which, when migrating, generally advance over the land. The flight of this bird is swift, strong, and well sustained. When roaming over large sand-bars, they move in compact bodies, whirling round, and suddenly veering, so as alternately to exhibit their upper and lower parts. At this time old and young are intermixed, and many of the former have lost the black so conspicuous on the neck and breast in summer. During winter, or as long as they frequent the sea-shore, they feed on marine insects, worms, and small shell-fish; and when they are in the interior, on grasshoppers and other insects, as well as berries of various kinds, on which they fatten so as to become tolerably good eating. This species is known in Pennsylvania by the name of Whistling Field Plover, suggested by the loud and modulated cries which it emits during the love-season. In the Eastern States, as well as in Kentucky, it is called the Bull-head; but in the South its most common appellation is Black-bellied Plover. I have seen it, though sparingly, along the shores of the Ohio, probably during its passage from the north. As its habits agree with those of the Plovers generally, and its form is similar to that of the Golden Plover and other species, the only difference being the presence of a rudimentary hind toe, it was scarcely necessary to distinguish it generically from _Charadrius_, as many recent authors have done. TRINGA HELVETICA, _Linn._ Syst. Nat. vol. i. p. 250.—_Lath._ Ind. Ornith. vol. ii. p. 728. TRINGA SQUATAROLA, _Linn._ Syst. Nat. vol. i. p. 252.—_Lath._ Ind. Ornith. vol. ii. p. 729. BLACK-BELLIED PLOVER, CHARADRIUS HELVETICUS, _Wils._ Amer. Ornith. vol. vii. p. 41, pl. 59, fig. 4. Summer. CHARADRIUS HELVETICUS, _Ch. Bonaparte_, Synopsis of Birds of United States, p. 298. GREY LAPWING, VANELLUS MELANOGASTER, _Richards. and Swains._ Fauna Bor.-Amer. vol. ii. p. 370. BLACK-BELLIED or SWISS PLOVER, _Nuttall_, Manual, vol. ii. p. 26. Adult Male in summer. Plate CCCXXXIV. Fig. 1.