Aplonis opaca Wetmore (part), in Townsend and Wetmore, Bull. Mus. Comp. Zoöl., 63, 1919, p. 219 (Truk).
Aplonis kittlitzi kittlitzi Momiyama (part), Tori, 2, 1920, p. 1 (Truk, Wolea).
Aplonis opaca anga Kuroda, in Momiyama, Birds Micronesia, 1922, p. 71 (?Luganor or Ruk, ?Nukuor, Wolea or Oleai); Takatsukasa and Yamashina, Tori, 32, 1930, p. 109 (Ruk); Mathews, Syst. Avium Australasianarum, 2, 1930, p. 847 (Ruk); Hand-list Japanese Birds, rev., 1932, p. 170 (Uluthi, Feys, Wolea, Ifalik, Faraulep, Lamotrek, Truk, Nukuoro).
Aplornis apaca anga Takatsukasa and Yamashina, Dobutsu. Zasshi, 43, 1931, p. 458 (Truk?); Hand-list Japanese Birds, 3d ed., 1942, p. 188 (Uluthi, Feys, Wolea, Ifalik, Faraulep, Lamotrek, Truk, Nukuoro).
Aplonis opacus angus Mayr, Birds Southwest Pacific, 1945, p. 297 (Truk and western Carolines); Baker, Smithson. Misc. Coll., vol. 107, no. 15, 1948, pp. 70, 71 (Ulithi Truk).
Geographic range.—Micronesia: Caroline Islands—Ulithi, Fais, Wolea, Ifalik, Faraulep, Lamotrek, Truk, Nukuoro, Lukunor.
Characters.—Adult: Resembles A. o. opacus, but larger and with bill less deep and feathers with distinct greenish luster both on the upper parts and the lower parts. Female smaller.
Immature: Resembles immature of A. o. opacus, but underparts streaked with brighter, buffy-yellow coloring.
Measurements.—Measurements are listed in [table 45].