I met with this bird from latitude 30° to 45° S. on both sides of S. America. In La Plata it is called “Teru-tero,” in imitation of its cry; and in Chile, according to Molina, “Theghel.” These birds, which in many respects resemble in habits our peewits (_Vanellus cristatus_), frequent, generally in pairs, open grassy land, and especially the neighbourhood of lakes. As the peewit takes its name from the sound of its voice, so does the teru-tero. While riding over the grassy plains, one is constantly pursued by these birds, which appear to hate mankind, and I am sure deserve to be hated, for their never-ceasing, unvaried, harsh screams. The stillness of the night is often disturbed by them. To the sportsman they are most annoying, by announcing to every other bird and animal his approach: to the traveller in the country, they may possibly, as Molina says, do good, by warning him of the midnight robber. During the breeding season, they attempt, like our peewits, by feigning to be wounded, to draw away from their nests dogs and other enemies. Their eggs are of a pointed oval form; of a brownish olive colour, thickly spotted with dark brown. Their eggs, like those of the peewit, are esteemed particularly good eating. 1. HIATICULA AZARÆ. _G. R. Gray._ Charadrius Azaræ, _Temm._ pl. col. 184. —— collaris, _Vieill._ Albatuitui à collier noir, _Azara_, No. 392. My specimens were obtained on the banks of the Plata and at Valparaiso. The specimen from the latter country differs from those procured at the former, in the absence of the black collar on the breast, of the black streak running from the eye to the corner of the mouth; in the plumage of the back and back of head having a lesser tinge of red; and especially in the feet being black, and tarsi blackish, instead of both being orange, as is the case with those killed on the shores of the Plata. I have not, however, thought it desirable to make two species of these birds, not having a larger series of specimens for comparison. 2. HIATICULA TRIFASCIATUS. _G. R. Gray._ Charadrius bifasciatus, _Licht._ Vog. Verz. p. 71. —— trifasciatus, _Wagl._ Syst. Av. sp. 31. I procured two specimens of this bird at Bahia Blanca, in Northern Patagonia. 3. HIATICULA SEMIPALMATA. _G. R. Gray._ Tringa semipalmata, _Temm._ Charadrius semipalmatus, _Caup._ Isis. 1825, p. 1375, t. 14. _Wagl._ Syst. Av. sp. 23. _Bonap._ Am. Orn. iv. pl. 25, f. 4. Galapagos Archipelago. HÆMATOPUS PALLIATUS. _Temm._ Rio Plata. EGRETTA LEUCE. _Bonap._ Ardea Leuce, Ill. Ardea Egretta, _Wils._ Am. Orn. pl. 61, f. 4. My specimen was procured at Maldonado. I saw it also in Patagonia. ARDEA HERODIAS. _Linn._