=Sula leucogaster plotus= (Forster) Brown Booby _Pelecanus Plotus_ Forster, Descr. Anim., ed. Licht., 1844, p. 278. (Type locality Near New Caledonia.) _Dysporus sula_ Hartlaub, Proc. Zool. Soc. London, 1867 (1868), p. 831 (Pelew); Hartlaub and Finsch, Proc. Zool. Soc. London, 1868, pp. 9, 118 (Pelew); _idem_, Proc. Zool. Soc. London, 1872, p. 90 (Pelew); Finsch, Journ. Mus. Godeffroy, 8, 1875, pp. 6, 47 (Palau); _idem_, Proc. Zool. Soc. London, 1880, p. 577 (Ruk); Hartert, Novit. Zool., 7, 1900, p. 11 (Ruk). _Sula fusca_ Finsch, Ibis, 1880, p. 218 (Taluit). _Sula leucogastra_ Salvadori, Ornith. Papuasia, 3, 1882, p. 423 (Pelew, Carolinis); Wiglesworth, Abhandl. und Ber. Zool. Mus. Dresden, no. 6, 1890-1891 (1891), p. 72 (Pelew, Ruk, Marshalls); Oustalet, Nouv. Arch. Mus. Hist. Nat. Paris, (3), 8, 1896, p. 63 (Palaos, Mariannes, Marshalls, Carolines); Hartert, Novit. Zool., 5, 1898, p. 68 (Marianne). _Sula sula_ Ogilvie-Grant, Cat. Birds British Museum, 26, 1898, p. 436 (Asuncion, Pelew); Seale, Occ. Papers Bernice P. Bishop Mus., 1, 1901, p. 24 (Guam); Safford, Osprey, 1902, p. 66 (Mariannas); _idem_, The Plant World, 7, 1904, p. 267 (Guam); _idem_, Contr. U. S. Nat. Herb., 9, 1905, p. 80 (Guam); _idem_, Guam, 1912, p. 19 (Guam); Prowazek, Die deutschen Marianen, 1913, p. 100 (Marianen); Takatsukasa and Kuroda, Tori, 1, 1915, p. 50 (Marianne); Cox, Island of Guam, 1917, p. 22 (Guam); Uchida, Annot. Zool. Japon., 9, 1918, pp. 487, 493 (Sea off Mariana Islands). _Sula leucogaster plotus_ Kuroda, in Momiyama, Birds Micronesia, 1922, p. 34 (Pelew, Ruk, West Faiu, Uracas, Saipan, Marshalls); Yamashina, Tori, 7, 1932, p. 407 (Medinilla); Hand-list Japanese Birds, rev., 1932, p. 185 (Uracas, Pagan, Medinilla, Saipan, Truk, West Fayu, Grimes, Marshalls); Hand-list Japanese Birds, 3d ed., 1942, p. 208 (Uracas, Pagan, Medinilla, Saipan, Grimes, West Fayu, Truk, Marshalls); Baker, Smithson. Misc. Coll., vol. 107, no. 15, 1948, p. 41 (Rota, Guam, Truk). _Geographic range._--Throughout tropical Pacific area and south to Australia. In Micronesia: Mariana Islands--Asuncion, Uracas, Pagan, Medinilla, Saipan, Rota, Guam; Palau Islands--exact locality unknown; Caroline Islands--Grimes, West Fayu, Truk, Kusaie; Marshall Islands--Jaluit, Eniwetok. _Characters._--Adult: A heavy sea bird dark brown except for white lower breast, belly, under tail, and auxillars; bill heavy and light bluish; face, gular pouch and feet greenish yellow. Immature: Resembles adult, but lower breast, belly and under tail mottled with brown; feet light yellow.