_Sterna sumatrana sumatrana_ Yamashina, Tori, 7, 1932, p. 410 (Aruno); Hachisuka, Birds Philippines, 2, 1932, p. 335 (Caroline, Pelew); Hand-list Japanese Birds, rev., 1932, p. 195 (Palau, Guam, Saipan, Yap, Truk, Lukunor, Nukuoro, Ponapé, Jaluit, Namu, Arhno, Majuro, Aurh); Peters, Check-list Birds World, 2, 1934, p. 336 (Caroline Islands); Mayr, List New Guinea Birds, 1941, p. 36 (Micronesia); Hand-list Japanese Birds, 3d ed., 1942, p. 218 (Babelthuap, Koror, Yap, Truk, Lukunor, Nukuoro, Ponapé, Jaluit, Namu, Arhno, Majuro, Aurh); Mayr, Birds Southwest Pacific, 1945, p. 24 (Micronesia); Baker, Smithson. Misc. Coll., vol. 107, no. 15, 1948, p. 55 (Peleliu, Ulithi). _Geographic range._--Micronesia, central Polynesia, northern Australia, Malaysia, west to India, and north to the Riu Kiu Islands. In Micronesia: Palau Islands--Babelthuap, Koror, Peleliu; Caroline Islands--Yap, Ulithi, Truk, Lukunor, Nukuoro, Ponapé; Marshall Islands--Jaluit, Namu, Majuro, Aurh, Bikini. _Characters._--Adult: A small tern with a long, forked tail and white plumage often with pinkish cast except for mantle, back, rump, tail, wing-coverts, and scapulars which are pale pearl-gray; band across nape, spot in front of eye, and outer web of outer primary black; bill and feet black. Immature: Resembles adult, but black and white mottling on upper parts. _Measurements._--Measurements are listed in table 19. _Specimens examined._--Total number, 15 (8 males, 6 females, 1 female?), as follows: Palau Islands, AMNH--exact locality not given, 4 (Oct.-Dec.); Caroline Islands, USNM--Ulithi Atoll, 6 (Aug. 15, 16, 20, 22); AMNH--Truk, 1 (Feb. 10); Marshall Islands, USNM--Bikini, 4 (March 26, April 30). _Nesting._--Nehrkorn (1899:222) recorded eggs taken at the Palau Islands. Yamashina (1932a:410) listed the finding of three nests containing one egg each on September 26, 1931, at Arhno in the Marshall Islands. The NAMRU2 party obtained no evidence of nesting at Ulithi or Palau in August and September, 1945. Coultas (field notes) obtained reports of the finding of two eggs at the Palau Islands in the period October to December, 1931. _Parasites._--Uchida (1918:483, 488) records the following Mallophaga taken at Ponapé from this tern: _Docophorus albemarlensis_, _Colpocephalum milleri_, and _Colpocephalum impertunum_.