_Sterna fuscata oahuensis_ Mayr, Birds Southwest Pacific, 1945, p. 25 (Micronesia). _Geographic range._--Breeds from the Hawaiian, Marcus, and Bonin islands south to the Phoenix Islands and Micronesia. In Micronesia: Mariana Islands--Asuncion; Palau Islands--Helen Reef; Caroline Islands--Ponapé. _Specimens examined._--Total number, 1 unsexed from Mariana Islands, AMNH--Asuncion (Jan. 18). _Remarks._--The systematic position of the Sooty Tern in Micronesia is uncertain; in using this name I am following Peters (1934:338), who comments that the species "is badly in need of revision." Coultas obtained one immature female at O° 90´ S and 159° 50´ E, a position south of the eastern Caroline Islands. The bird is tentatively placed in the subspecies _S. f. oahuensis_. The Sooty Tern probably does not breed in large numbers in Micronesia, unless it be in the northern Marianas. Bryan (1903:97) reports that this species is very abundant at Marcus Island, which is north and east of the Marianas. =Sterna albifrons sinensis= Gmelin Least Tern _Sterna sinensis_ Gmelin, Syst. Nat., 1, pt. 2, 1789, p. 608. (Type locality, China, ex Latham.) _Sterna albifrons_ Marshall, Condor, 51, 1949, p. 221 (Saipan). _Geographic range._--Found on coastal areas from Korea and China south to New Guinea. In Micronesia: Mariana Islands--Saipan. _Specimens examined._--One female from Mariana Islands, USNM--Saipan (Sept. 26). _Remarks._--Marshall (1949:221) took one of two Least Terns at Lake Susupe on Saipan on September 26, 1945. The specimen taken, a female, is in post juvenal molt. =Thalasseus bergii pelecanoides= (King) Crested Tern _Sterna pelecanoides_ King, Surv. Intertrop. and Western Coasts Australia, 2, 1827, p. 422. (Type locality, Torres Strait, northern Queensland.) _Sterna bergii_ Finsch, Journ. Mus. Godeffroy, 8, 1875, p. 50 (Palau); _idem_, Proc. Zool. Soc. London, 1877 (1878), p. 781 (Ponapé); _idem_, Ibis, 1880, pp. 330, 332 (Ratak Chain); _idem_, Journ. f. Ornith., 1880, p. 295 (Ponapé); _idem_, Proc. Zool. Soc. London, 1880, p. 577 (Ruk); _idem_, Ibis, 1881, pp. 113, 115 (Ponapé); Schmeltz and Krause, Ethnogr. Abth. Mus. Godeffroy, 1881, pp. 281, 299, 330, 353 (Ponapé, Mortlock, Nukuor, Ruk); Salvadori, Ornith. Papuasia, 3, 1882, p. 434 (Ruk, Ponapé, Marshalls); Finsch, Mitth. Ornith. Ver. Wien, 1884, p. 51 (Jaluit); Wiglesworth, Abhandl. und Ber. Zool. Mus. Dresden, no. 6, 1890-1891 (1891), p. 74 (Pelew, Luganor, Nukuor, Ruk, Ponapé, Marshall Islands); Hartert, Novit. Zool., 7, 1900, p. 10 (Ruk); Saunders, Cat. Birds British Mus., 25, 1896, p. 89 (Ponapé, Marshalls); Takatsukasa and Kuroda, Tori, 1, 1915, p. 52 (Ponapé); Uchida, Annot. Zool. Japon., 9, 1918, pp. 483, 488 (Ponapé). _Sterna bergeri_ Schnee, Zool. Jahrbücher, 20, 1904, p. 390 (Marschall-Inseln).