(EYEBROWED TERN.)
Sterna superciliaris, Scl. et Salv. Nomencl. p. 147; iid. P. Z. S. 1871, p. 571; Durnford, Ibis, 1877, p. 201 (Buenos Ayres); White, P. Z. S. 1882, p. 628 (Misiones); Saunders, P. Z. S. 1876, p. 662. Sterna argentea, Burm. La-Plata Reise, ii. p. 519 (Paraná).
Description.—Forehead and underparts white; loral stripe, head, and nape black; back, rump, inner primaries, and inner web of tail pale slate-grey; outer primaries blackish; bill yellow; legs and feet olive-yellow: whole length 8·5 inches, wing 7·0. In the young bird the crown is grey.
Hab. The large rivers and the coast on the east side of South America.
This is a little Tern, belonging to the same group as the European Sterna minuta, with a uniform pale yellow bill. Durnford met with it at Baradero, and says that it frequents shallow inland lagoons and small streams, but is also found on the Rio de la Plata. Dr. Burmeister obtained it on the Paraná, and White at Itapua, Misiones. Saunders shot it on the Huallaga, in Peru, 2800 miles inland.
[416.] LARUS DOMINICANUS, Licht.
(DOMINICAN GULL.)
Larus dominicanus, Scl. et Salv. Nomencl. p. 148; iid. P. Z. S. 1871, p. 576; Durnford, Ibis, 1877, p. 45 (Chupat) et p. 201 (Buenos Ayres), et 1878, p. 405 (Chupat); Barrows, Auk, 1884, p. 316 (Pampas); Saunders, P. Z. S. 1878. p. 180; Withington, Ibis, 1888, p. 472 (Lomas de Zamora). Larus vociferus, Burm. La-Plata Reise, ii. p. 518 (Buenos Ayres).
Description.—Mantle brownish-black; primaries black, with white tips, and a subapical patch in old birds; rest of plumage white; bill yellow, orange at angle of lower mandible; legs and feet olive: whole length 21·0-22·0 inches, wing 17·0-18·0. Young mottled brown.
Hab. Both coasts of South America, from Peru on the west and Rio on the east, to Patagonia and Falkland Islands.