_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.