_Ortygometra cinerea_ Finsch, Journ. Mus. Godeffroy, 8, 1875, pp. 5, 38 (Palau, Yap); _idem_, Proc. Zool. Soc. London, 1880, p. 577 (Ruk); Salvadori, Ornith. Papuasia, 3, 1882, p. 273 (Yap, Pelew); Wiglesworth, Abhandl. und Ber. Zool. Mus. Dresden, no. 6, 1890-1891 (1891), p. 61 (Pelew, Yap, Ruk); Finsch, Deut. Ver. zum Schulze der Vogelwelt, 18, 1893, p. 459 (Palau). _Ortygometra cinerea = quadristrigata_ Schmeltz and Krause, Ethnogr. Abth. Mus. Godeffroy, 1881, p. 353 (Ruk). _Poliolimnas cinereus_ Sharpe, Cat. Birds British Mus., 23, 1894, p. 130 (Pelew, Yap, Ruk); Hartert, Novit. Zool., 5, 1898, p. 64 (Guam); _idem_, Novit. Zool., 7, 1900, p. 9 (Ruk); Scale, Occ. Papers Bernice P. Bishop Mus., 1, 1901, p. 30 (Guam); Safford, Osprey, 1902, p. 67 (Mariannes); _idem_, The Plant World, 7, 1904, p. 265 (Guam); _idem_, Contr. U. S. Nat. Herb., 9, 1905, p. 79 (Guam); Cox, Island of Guam, 1917, p. 21 (Guam); Kuroda, in Momiyama, Birds Micronesia, 1922, p. 42 (Guam, Pelew, Yap, Ruk). _Porzana cinerea_ Stresemann, Novit. Zool., 21, 1914, p. 54 (Guam, Truk). _Porzana cinerea ocularis_ Hartert, Novit. Zool., 31, 1924, p. 264 (Ruk, Guam). _Poliolimnas cinereus collingwoodi_ Mathews, Syst. Avium Australasianarum, 1, 1927, p. 95 (Pelew, Marianne, Carolines); Hand-list Japanese Birds, rev., 1932, p. 197 (Guam, Koror, Yap, Truk); Hachisuka, Birds Philippine Islands, 1, 1932, p. 236 (Marianne, Pelew, Caroline); Peters, Check-list Birds World, 2, 1934, p. 198 (Marianne, Caroline, Pelew); Bryan, Guam Rev., vol. 13, no. 2, 1936, p. 15 (Guam); Mayr, Birds Southwest Pacific, 1945, p. 288 (Guam, Palau, Yap, Truk, Bikini); Delacour and Mayr, Birds Philippines, 1946, p. 64 (Micronesia); Baker, Smithson. Misc. Coll., vol. 107, no. 15, 1948, p. 48 (Ulithi?, Truk). _Porzana cinerea collingwoodi_ Rensch, Mitt. Zool., 1931, p. 468 (Marianne, Karolinen, Palau). _Poliolimnas cinereus micronesiae_ Yamashina, Tori, 10, 1940, p. 679 (Bikini); Hand-list Japanese Birds, 3d ed., 1942, p. 221 (Guam, Babelthuap, Koror, Yap, Truk, Bikini). _Geographic range._--Micronesia: Mariana Islands--Guam; Palau Islands--Koror, Babelthuap; Caroline Islands--Yap, Ulithi?, Truk; Marshall Islands--Bikini.