_Calidris leucopterus_ Cuvier, Règne Anim. I, p. 526 (1829). _Tringa pyrrhetraea_ Lichtenstein, Forster's descr. anim. p. 174 (1844--Otaheiti). _Prosobonia leucoptera_ Bonaparte, Compt. Rend. XXXI, p. 562 (1850); Sharpe, Cat. B. Brit. Mus. XXIV, p. 525 (1896). _Tringoides leucopterus_ Gray, Handl. B. III, p. 46 (1871). _Phegornis leucopterus_ Seebohm, Geogr. Distrib. Charad. p. 452 pl. 18 (1888). _Prosobonia ellisi_ Sharpe, Bull. B.O.C. XVI, p. 86 (1906--"Eimeo"). Dr. Sharpe's description, made from the type in the Leyden Museum, is as follows: "Adult. General colour of upper surface blackish brown; the lower back and rump ferruginous; centre tail-feathers blackish, the rest rufous, banded with black, less distinctly on the two next the middle pair; wing-coverts blackish, with a white spot near the carpal bend of the wing, formed by some of the lesser coverts; crown of head blackish, the hind-neck browner, mixed with black; sides of face brown, the lores and ear-coverts slightly more reddish, behind the eye a little white spot; cheeks and under surface of body ferruginous red, the throat buffy white. Length 6.7 inches, culmen 0.9, wing 4.45, tail 2.15, tarsus 1.3 (Mus. Lugd.)" We know nothing of this bird, but the one specimen in the Leyden Museum, which is the type, or at least one of the types. As no other specimens have been obtained for nearly a century and a quarter, there is every reason to fear that this bird is extinct. My plate has been made up by Mr. Lodge from the unpublished drawings of Ellis and Forster in the British Museum. Habitat: Tahiti, and the adjacent islet of Eimeo. {119} AECHMORHYNCHUS COUES. This genus appears to be closely allied to _Prosobonia_, but has a much shorter hind toe. Its colouration is very different, and quite that of a Sandpiper, while the pattern of _Prosobonia_ is most singular. Seebohm placed _Aechmorhynchus_, together with _Prosobonia_, in the genus _Phegornis_. We know only one species. AECHMORHYNCHUS CANCELLATA (GM.) (PLATE 35.) _Barred Phalarope_ Latham, Gen. Syn. III. pt. 1, p. 274 (1785--Christmas Island in the Pacific Ocean). _Tringa cancellata_ Gmelin, Syst. Nat. I, p. 675 (1788--ex Latham). _Tringa parvirostris_ Peale, U.S. Expl. Exp., Birds p. 235, pl. LXVI, 2 (1848--Paumotu) Cassin, U.S. Expl. Exp. p. 321, pl. 38, 2 (1858--Paumotu). _Totanus_ (_Tryngites?_) _cancellatus_ Gray, Cat. B. Trop. Islands Pac. Ocean, p. 51 (1859). _Phegornis cancellatus_ Seebohm, Geogr. Distrib. Charadr. p. 451, pl. 17 (1888). _Aechmorhynchus cancellatus_ Sharpe, Cat. B. Brit. Mus. XXIV, p. 525 (1896).