Zosterops conspicillatum Bonaparte, Consp. Avium, 1, 1850, p. 398 (Mariann. = Guam).
Zosterops conspicillata Reichenbach, Syn. Avium, 1852, p. 92 (Guaham); Hartlaub, Journ. f. Ornith., 1854, p. 187 (Mariannen = Guam); Gray, Cat. Birds Trop. Is. Pacific Ocean, 1859, p. 16 (Guam); Hartlaub, Journ. f. Ornith., 1865, pp. 5, 17 (Guaham); Gray, Hand-list Birds, 1, 1869, p. 163 (Ladrone = Guam); Hartlaub and Finsch, Proc. Zool. Soc. London, 1872, p. 95 (Guaham); Giebel, Thes. Ornith., 3, 1877, p. 775 (Ladrone = Guam); Gadow, Cat. Birds British Mus., 9, 1884, p. 187 (Guam); Wiglesworth, Abhandl. und Ber. Zool. Mus. Dresden, no. 6, 1890-1891 (1891), p. 37 (Guam); Oustalet (part), Nouv. Arch. Mus. Hist. Nat. Paris, (3), 7, 1895, p. 205 (Guam); Hartert (part), Novit. Zool., 5, 1898, p. 57 (Guam); Hartert, Novit. Zool., 7, 1900, p. 3 (Guam); Matschie (part), Journ. f. Ornith., 1901, pp. 112, 113 (Guam); Seale, Occ. Papers Bernice P. Bishop Mus., 1, 1901, p. 58 (Guam); Finsch (part), Das Tierreich, no. 15, 1901, p. 37 (Guam); Safford, Osprey, 1902, p. 69 (Guam); Dubois, Syn. Avium, 1, 1902, p. 711 (Guam); Safford, The Plant World, 7, 1904, p. 264 (Guam); idem, Contr. U. S. Nat. Herb., 9, 1905, p. 79 (Guam); Takatsukasa and Kuroda (part), Tori, 1, 1901, p. 64 (Marianne = Guam); Cox, Island of Guam, 1917, p. 21 (Guam); Mathews, Syst. Avium Australasianarum, 2, 1930, p. 706 (Guam); Bryan, Guam. Rec., vol. 13, no. 2, 1936, p. 25 (Guam); Strophlet, Auk, 1948, p. 540 (Guam).
Zosterops conspicillatus Kuroda (part), in Momiyama, Birds Micronesia, 1922, p. 76 (Guam).
Zosterops conspicillata conspicillata Stresemann, Mitt. Zool. Mus. Berlin, 17, 1931, p. 227 (Guam); Hand-list Japanese Birds, rev., 1932, p. 173 (Guam); Hand-list Japanese Birds, 3d ed., 1942, p. 192 (Guam); Mayr, Amer. Mus. Novit., no. 1269, 1944, p. 7 (Guam); idem, Birds Southwest Pacific, 1945, p. 299 (Guam); Baker, Smithson. Misc. Coll., vol. 107, no. 15, 1948, pp. 72, 73 (Guam).
Geographic range.—Micronesia: Mariana Islands—Guam.
Characters.—Adult: A small white-eye with upper parts near "serpentine green," becoming slightly lighter on the rump; orbital ring broad and white; fronto-loral band light yellowish-white; auriculars grayish-green; chin and throat yellowish-white; breast and abdomen dingy yellow; wing and tail feathers dark brown with greenish-yellow edges; upper mandible horn colored, lower mandible lighter yellow; legs and feet dark olive-gray; iris light umber. Adult female may be lighter on underparts.
Immature: Resembles adult, but underparts paler yellow and upper mandible light yellowish-brown.
Measurements.—Measurements of Z. c. conspicillata are listed in [table 50]. Males and females have measurements which are nearly equal.
Table 50. Measurements of the Subspecies of Zosterops conspicillata