Aegialitis mongolus Hartert, Novit. Zool., 7, 1900, p. 9 (Ruk).
Aegialis mongola Safford, Contr. U. S. Nat. Herb., 9, 1905, p. 80 (Guam).
Aegialites mongola Cox, Island of Guam, 1917, p. 22 (Guam).
Ochthodromus mongolicus Takatsukasa and Kuroda, Tori, 1, 1915, p. 62 (Marianas, Ruk).
Charadrius mongolus Ridgway, Bull. U. S. Nat. Mus., 50, pt. 8, 1919, p. 132 (Ruk); Mayr, Birds Southwest Pacific, 1945, p. 38 (Micronesia).
Charadrius mongolus mongolus Hartert, Vögel pal. Fauna, 11-12, 1920, p. 1543 (Marianen, Karolinen); Hand-list Japanese Birds, rev., 1932, p. 194 (Guam, Truk, Iuripik, Kusaie, Jaluit, Majuro); Peters, Check-list Birds World, 2, 1934, p. 253 (Carolines, Marianas); Bryan, Guam Rec., vol. 13, no. 2, 1936, p. 24 (Guam); Baker, Smithson. Misc. Coll., vol. 107, no. 15, 1948, p. 50 (Guam, Peleliu, Ulithi).
Cirrepidesmus mongolus mongolus Kuroda, in Momiyama, Birds Micronesia, 1922, p. 44 (Guam, Ruk).
Charadrius mongolus stegmanni Hand-list Japanese Birds, 3d ed., 1942, p. 217 (Guam, Peliliu, Truk, Iuripik, Kusaie, Jaluit, Majuro).
Geographic range.—Breeds in northeastern Siberia and Bering Sea area. Winters south to eastern Malaysia, Melanesia, and Australia. In Micronesia: Mariana Islands—Guam; Palau Islands—Angaur, Peleliu; Caroline Islands—Ulithi, Truk, Iuripik, Kusaie; Marshall Islands—Jaluit, Majuro.
Specimens examined.—Total number, 10 (4 males, 5 females, 1 unsexed), as follows: Mariana Islands, USNM—Guam, 2 (June 7, Sept. 1); AMNH—Guam, 3 (Aug. 15, 18, Nov. 30); Palau Islands, USNM—Peleliu, 3 (Sept. 7-12); Caroline Islands, USNM—Ulithi, 1 (Aug. 22); AMNH—Truk, 1 (Feb. 8).