_Collocalia fuciphaga_ Sclater, Proc. Zool. Soc. London, 1865, p. 616 (Marianne); Oustalet (part), Nouv. Arch. Mus. Hist. Nat. Paris, (3), 7, 1895, p. 187 (Mariannes); Hartert, Novit. Zool., 5, 1898, p. 53 (Rota, Guam, Saipan); Seale, Occ. Papers Bernice P. Bishop Mus., 1, 1901, p. 46 (Marianas); Safford, Osprey, 1902, p. 60 (Marianas); _idem_, The Plant World, 7, 1904, pp. 84, 263 (Guam); _idem_, Contr. U. S. Nat. Herb., 9, 1905, p. 79 (Guam); Prowazek, Die deutschen Marianen, 1913, p. 102 (Marianen); Cox, Island of Guam, 1917, p. 21 (Guam); Bryan, Guam Rec., vol. 13, no. 2, 1936, p. 25 (Guam). _Collocalia fuchphaga_ Wheeler, Report Island of Guam, 1900, p. 13 (Guam). _Collocalia fuciphaga fuciphaga_ Oberholser (part), Proc. Acad. Nat. Sci. Phila., 1906, p. 186 (Guam). _Collocalia unicolor amelis_ Oberholser, Proc. Acad. Nat. Sci. Phila., 1906, p. 193 (Guam); Kuroda, in Momiyama, Birds Micronesia, 1922, p. 63 (Guam). _Collocalia fuciphaga tachyptera_ Obersolser, Proc. U. S. Nat. Mus., 42, 1912, p. 20 (Type locality, Guam); Stresemann, Verhandl. Ornith. Gesellsch. Bayern, 12, 1914, p. 11 (Guam); Takatsukasa and Kuroda, Tori, 1, 1915, p. 63 (Marianas); Kuroda, in Momiyama, Birds Michnoseia, 1922, p. 62 (Guam, Saipan, Rota). _Collocalia unicolor bartschi_ Kuroda, in Momiyama, Birds Micronesia, 1922, p. 63 (Guam). _Collocalia fuciphaga bartschi_ Mathews, Syst. Avium Australasianarum, 1, 1927, p. 402 (Guam); Hand-list Japanese Birds, rev., 1932, p. 178 (Marianas). _Collocalia vanikorensis bartschi_ Mayr, Amer. Mus. Novit., no. 828, 1936, p. 11 (Marianne); Hand-list Japanese Birds, 3d ed., 1942, p. 198 (Saipan, Rota, Guam). _Collocalia germani bartschi_ Mayr, Amer. Mus. Novit., no. 915, 1937, p. 18 (Marianne). _Collocalia inexpectata bartschi_ Peters, Check-list Birds World, 4, 1940, p. 224 (Marianne); Mayr, Birds Southwest Pacific, 1945, p. 292 (Marianas); Watson, The Raven, 17, 1946, p. 41 (Guam); Downs, Trans. Kansas Acad. Sci., 49, 1946, p. 105 (Tinian); Stott, Auk, 64, 1947, p. 526 (Saipan); Baker, Smithson. Misc. Coll., vol. 107, no. 15, 1948, p. 63 (Guam, Rota). _Collocalia inexpectata_ Strophlet, Auk, 63, 1946, p. 538 (Guam); Baker, Condor, 49, 1947, p. 125 (Guam). _Geographic range._--Micronesia: Mariana Islands--Guam, Rota, Tinian, Saipan. _Characters._--Resembles _C. i. pelewensis_, but with wing shorter; upper parts lighter; underparts more brownish and lacking dark shaft-streaks on breast and abdomen; feathers on lores whiter basally. _Measurements._--Measurements are presented in table 30. _Weights._--The present author (1948:63) lists the weights of seven adult males as 6.4-7.3 (6.8); of three adult females as 6.8-7.6 (7.1). These birds were taken at Guam.