This is likewise an Arctic-American species which visits South America in winter. I have met with it in small flocks near Buenos Ayres in April and May; and it has also been procured in Chili. 401. TRINGA FUSCICOLLIS, Vieill. (BONAPARTE'S SANDPIPER.) +Tringa fuscicollis+, _Scl. et Salv. Nomencl._ p. 145; _Durnford, Ibis_, 1878, p. 68 (Buenos Ayres) et p. 404 (Centr. Patagonia); _White, P. Z. S._ 1883, p. 42 (Buenos Ayres); _Barrows, Auk_, 1884, p. 314 (Entrerios); _Saunders, Yarrell's Birds_, iii. p. 373. +Tringa bonapartii+, _Scl. et Salv. P. Z. S._ 1868, p. 144, et 1873, p. 455 (Buenos Ayres); _Seebohm, Plovers_, p. 445. +Actodromas fuscicollis+, _Baird, Brew., et Ridgw. Water-B. N. A._ i. p. 227. _Description._--Above brownish grey, varied and spotted with black; superciliaries white; rump grey, upper tail-coverts white: beneath white; breast and flanks spotted and streaked with blackish: whole length 7·0 inches, wing 4·8, tail 2·1. _Female_ similar. _Hab._ Arctic America, migrating south to Patagonia in winter. Bonaparte's Sandpiper is a third of the same category of Arctic _Tringæ_ that range far south after the breeding-season. Durnford found it common "in flocks" near Buenos Ayres, and again in the valley of the Sengel river in Central Patagonia in winter. White and Hudson also obtained specimens near Buenos Ayres, and Barrows in Entrerios near Concepcion. 402. CALIDRIS ARENARIA (Linn.). (SANDERLING.) +Calidris arenaria+, _Scl. et Salv. Nomencl._ p. 145; _Durnford, Ibis_, 1878, p. 404 (Tombo Point); _Baird, Brew., et Ridgw. Water-B. N. A._ i. p. 249; _Saunders, Yarrell's Birds_, iii. p. 420. +Tringa arenaria+, _Seebohm, Plovers_, p. 431. _Description._--No hind toe. Above in summer light rufous, in winter light greyish, spotted and striped with blackish and edged with whitish: beneath white; bill and feet black: whole length 7·5 inches, wing 5·5, tail 2·2. _Female_ similar. _Hab._ Arctic regions of both hemispheres, descending far south in winter. The Sanderling is one of the most widely spread of all the Arctic Grallæ during its winter migration. Durnford obtained examples at Tombo Point, Central Patagonia, on the 30th December, 1877, so that it must necessarily pass through the Argentine Republic. It is only known to breed in the high Northern Polar lands. 403. TOTANUS MELANOLEUCUS (Gm.). (GREATER YELLOWSHANK.) +Totanus melanoleucus+, _Burm. La-Plata Reise_, ii. p. 503; _Baird, Brew., et Ridgw. Water-B. N. A._ i. p. 269; _Seebohm, Plovers_, p. 363; _Barrows, Auk_, 1884, p. 315 (Entrerios). +Gambetta melanoleuca+, _Scl. et Salv. Nomencl._ p. 145; _iid. P. Z. S._ 1868, p. 144 (Buenos Ayres); _Durnford, Ibis_, 1877, p. 199 (Buenos Ayres); _Withington, Ibis_, 1888, p. 472 (Lomas de Zamora). +Totanus chilensis+, _Philippi, Wiegm. Arch._ 1857, pt. i. p. 264 (Chili).