Calornis kittlitzi Hartlaub and Finsch (part), Proc. Zool. Soc. London, 1872, p. 100 (Uap); Gräffe, Journ. Mus. Godeffroy, 2, 1873, p. 123 (Yap); Finsch (part), Journ. Mus. Godeffroy, 8, 1875, pp. 5, 24 (Yap); Schmeltz and Krause (part), Ethnogr. Abth. Mus. Godeffroy, 1881, p. 298 (Yap).
Calornis pacificus Finsch (part), Journ. Mus. Godeffroy, 12, 1876, p. 32 (Yap).
Aplonis kittlitzi Wiglesworth, Abhandl. und Ber. Zool. Mus. Dresden, no. 6, 1890-1891 (1891), p. 44 (Yap); Oustalet (part), Nouv. Arch. Mus. Hist. Nat. Paris, (3), 7, 1895, p. 216 (Yap); Hartert (part), Novit. Zool., 5, 1898, p. 58 (Yap); Bolau (part), Mitteil. Naturhist. Mus. Hamburg, 1898, p. 62 (Yap); Matschie (part), Journ. f. Ornith., 49, 1901, p. 112 (Yap); Takatsukasa and Kuroda (part), Tori, 1, 1915, p. 64 (Yap).
Aplonis opaca kurodai Momiyama, Birds Micronesia, 1922, p. 11 (Yap); Kuroda, in Momiyama, Birds Micronesia, 1922, p. 71 (Yap); Mathews, Syst. Avium Australasianarum, 2, 1930, p. 848 (Yap); Hand-list Japanese Birds, rev., 1932, p. 170 (Yap).
Aplonis opaca kurodai Takatsukasa and Yamashina, Dobutsu, Zasshi, 43, 1931, p. 458 (Yap?); Hand-list Japanese Birds, 3d ed., 1942, p. 188 (Yap).
Aplonis opacus kurodai Mayr, Birds Southwest Pacific, 1945, p. 297 (Yap); Baker, Smithson. Misc. Coll., vol. 107, no. 15, 1948, p. 71 (Yap).
Geographic range.—Micronesia: Caroline Islands—Yap.
Characters.—Adult: According to Momiyama (1922:11), "Similar to A. o. anga from Ruk group, but the bill thicker (9-10.5 mm.; that of the latter 8.5-9.5 mm.) and much longer (24-27.5 mm.; that of the latter 21.5-25 mm.) and the wing also longer in average (119.5-130 mm. instead of 116.5-129.5 mm.). It differs from typical opaca by the edge of feathers of both body sides very distinctly tinged with a bronzy-green lustre, by the bill being longer and thicker (in typical opaca exposed culmen 21.5-24.5 mm., depth of bill 9-9.5 mm.)."
of body somewhat deeper in colour and the edge of feathers distinctly tinged with lustrous bronzy-green. It differs from the same stage of A. o. anga by the under-parts being without pale-yellowish area." Momiyama (1922:11).
Young: "Similar to the young of typical bird, but differs from it by the mantle being very faintly tinged with bronzy-green and by the under-parts being somewhat tinged with brown. In the same stage of the typical form, the under-parts are much more greyish-ashy in colour." Momiyama (1922:11).