_Micranous marcusi_ Bryan, Occ. Papers Bernice P. Bishop Mus., 2,
1903, p. 101. (Type locality, Marcus Island.)
_Sterna tenuirostris_ Kittlitz, Obser. Zool., in Lutké, Voy. "Le
Séniavine," 3, 1836, pp. 286, 308 (Ualan, Ouleai); _idem_, Denkw.
Reise russ. Amer. Micron. und Kamchat., 2, 1858, p. 64 (Ualan).
_Anous tenuirostris_ Hartlaub and Finsch, Proc. Zool. Soc. London,
1872, pp. 90, 113 (Pelew, Carolines); Finsch, Journ. Mus.
Godeffroy, 8, 1875, pp. 6, 42 (Palau); Schmeltz and Krause,
Ethnogr. Abth. Mus. Godeffroy, 1881, pp. 299, 330 (Mortlock,
Nukuor); Stott, Auk, 64, 1947, p. 526 (Saipan).
_Anous melanogenys_ Finsch, Proc. Zool. Soc. London, 1877 (1878),
p. 781 (Palau); _idem_, Journ. f. Ornith., 1880, pp. 295, 308
(Ponapé, Kuschai); _idem_, Ibis, 1880, pp. 219, 220, 332 (Taluit,
Arno); _idem_, Proc. Zool. Soc. London, 1880, p. 577 (Ruk); _idem_,
Ibis, 1881, pp. 107, 109, 115 (Kuschai, Ponape); Salvadori, Ornith.
Papuasia, 3, 1882, p. 456 (Pelew, Ponapé, Marshalls); Finsch,
Mitth. Ornith. Ver. Wien, 1884, p. 52 (Jaluit, Arno, Kuschai);
Wiglesworth, Abhandl. und Ber. Zool. Mus. Dresden, no. 6,
1890-1901 (1891), p. 77 (Pelew, Ualan, Ponapé, Nukuor, Luganor,
Ruk); Hartert, Katalog Vogelsamml. Senckenb., 1891, p. 238 (Ualan);
Takatsukasa and Kuroda, Tori, 1, 1915, p. 62 (Ruk); Kuroda, in
Momiyama, Birds Micronesia, 1922, p. 50 (Pelew, Ruk, Wolea,
Luganor, Nukuor, Ponapé, Kusaie, Marshalls).
_Anous leucocapillus_ Finsch, Proc. Zool. Soc. London, 1877
(1878), p. 781 (Ponapé); Nehrkorn, Journ. f. Ornith., 1879, p. 410
(Ponapé); Schmeltz and Krause, Ethnogr. Abth. Mus. Godeffroy,
1881, p. 281 (Ponapé); Finsch, Mitth. Ornith. Ver. Wien, 1884, p.
52 (Jaluit); Tristram, Cat. Coll. Birds, 1889, p. 10 (Pelew);
Salvadori, Ornith. Papuasia, 3, 1882, p. 457 (Pelew); Wiglesworth,
Abhandl. und Ber Zool. Mus. Dresden, no. 6, 1890-1891 (1891), p.
77 (Pelew); Oustalet, Nouv. Arch. Mus. Hist. Nat. Paris, (3), 8,
1896, p. 60 (Saypan, Palaos, Ruk, Luganor, Nukuor, Ponapé,
Kuschai, Bonham); Hartert, Novit. Zool., 5, 1898, p. 68
(Marianne); Seale, Occ. Papers Bernice P. Bishop Mus., 1, 1901, p.
20 (Saipan?); Safford, Osprey, 1902, p. 66 (Marianas); _idem_, The
Plant World, 7, 1904, p. 267 (Guam); Schnee, Zool. Jahrbücher, 20,
1904, p. 390 (Marschall-Inseln); Safford, Contr. U. S. Nat. Herb.,
9, 1905, p. 80 (Guam); Cox, Island of Guam, 1917, p. 22 (Guam).
_Micranous leucocapillus_ Saunders, Cat. Birds British Mus., 25,
1896, p. 145 (Pelew, Caroline Islands); Nehrkorn, Kat. Eiers.,
1899, p. 222 (Kusai); Hartert, Novit. Zool., 7, 1900, p. 9 (Ruk);
Takatsukasa and Kuroda, Tori, 1, 1915, p. 51 (Pelew).
_Megalopterus minutus marcusi_ Mathews, Birds Australia, 2, 1912,
p. 423 (Marianas?); Ridgway, Bull. U. S. Nat. Mus., 50, pt. 8,
1919, p. 553 (Mariannes?); Mathews, Syst. Avium Australasianarum,
1, 1927, p. 146 (Mariannes); Hachisuka, Birds Philippines, 2,
1932, p. 343 (Mariannes).
_Megalopterus tenuirostris leucocapillus_ Kuroda, in Momiyama,
Birds Micronesia, 1922, p. 50 (Saipan, Pelew, Ruk, Ponapé,
Kusaie).
_Megalopterus minutus minutus_ Fisher and Wetmore, Proc. U. S.
Nat. Mus., 79, 1931, p. 45 (Caroline Islands).
_Anous minutus worcesteri_ Yamashina, Tori, 7, 1932, p. 409
(Coror, Namo, Iringlab); Hand-list Japanese Birds, rev., 1932, p.
195 (Saipan, Babelthuap, Koror, Truk, Ponapé, Kusaie, Ebon,
Namorik, Jaluit, Elmore, Mille, Aurh, Wotze, Ailuk); Yamashina,
Tori, 10, 1940, p. 678 (Assongsong, Saipan); Hand-list Japanese
Birds, 3d ed., 1942, p. 219 (Assongsong, Saipan, Babelthuap,
Koror, Peliliu, Truk, Ponapé, Kusaie, Ebon, Namorik, Jaluit,
Elmore, Mille, Aurh, Wotze, Ailuk).
_Anous minutus marcusi_ Peters, Check-list Birds World, 2, 1934,
p. 347 (Caroline Islands).
_Anous minutus_ Bequaert, Mushi, 12, 1939, p. 82 (Ponapé); _idem_,
Occ. Papers Bernice P. Bishop Mus., 16, 1941, p. 253 (Ponapé,
Palau).
_Anous tenuirostris marcusi_ Mayr, Birds Southwest Pacific, 1945,
p. 27 (Micronesia); Baker, Smithson. Misc. Coll., vol. 107, no.
15, 1948, p. 56 (Peleliu, Ulithi, Truk).
_Geographic range._--Marcus, Wake, and Micronesia. In Micronesia:
Mariana Islands--Asuncion, Saipan, Guam?; Palau
Islands--Babelthuap, Koror, Peleliu; Caroline Islands--Ulithi,
Truk, Ponapé, Luganor, Nukuor, Wolea; Marshall Islands--Ebon,
Namorik, Jaluit, Elmore, Mille, Aurh, Wotze, Ailuk.
_Characters._--Adult: A small tern with sooty-black plumage,
grayer on rump and tail; forehead and crown white becoming grayer
on nape to merge with blackish on shoulder; narrow, black
superciliary stripe; lores black, lower eyelid with white streak,
upper eyelid with white spot. Resembles _A. t. melanogenys_ but
wing and tail longer and superciliary stripe narrower. Resembles
_A. t. minutus_ but with narrower, black superciliary stripe.
Immature: Resembles adult, but crown more whitish, this coloration
ending abruptly at nape, with mottling in some birds; plumage of
body with brownish wash.
_Measurements._--Measurements are listed in table 22.
_Specimens examined._--Total number, 51 (27 males, 22 females, 2
unsexed), as follows: Mariana Islands, AMNH--Asuncion, 1 (Jan. 18);
Palau Islands, USNM--Peleliu, 2 (Sept. 9, 12); AMNH--exact locality
not given, 2 (Nov. 3); Caroline Islands, USNM--Ulithi, 4 (Aug. 20);
AMNH--Truk, 5 (Nov. 16, 21, 22)--Ponapé, 15 (Dec. 15)--Kusaie, 17
(Jan. 10, March 10-30, April 1-10); Marshall Islands, USNM--Bikini,
4 (May 2, 14); AMNH--no locality given, 1 (Sept. 3).