_Collocalia pelewensis_ Mayr, Amer. Mus. Novit., no. 820, 1935, p.
3. (Type locality, Palau Islands.)
_Collocalia vanicorensis_ Hartlaub, Proc. Zool. Soc. London, 1867
(1868), p. 829 (Pelew); Hartlaub and Finsch, Proc. Zool. Soc.
London, 1868, pp. 4, 116, 118 (Pelew); _idem_, Proc. Zool. Soc.
London, 1872, p. 89 (Pelew); Finsch, Journ. Mus. Godeffroy, 8,
1875, pp. 4, 15 (Palau); _idem_ (part), Journ. Mus. Godeffroy, 12,
1876, pp. 17, 24 (Palau); _idem_ (part), Proc. Zool. Soc. London,
1880, p. 575 (Palaos); _idem (part), Ibis, 1881, p. 104 (Pelew);
Tristram, Cat. Birds, 1889, p. 111 (Pelew);_ Wiglesworth (part),
Abhandl. und Ber. Zool. Mus. Dresden, no. 6, 1890-1891 (1891), p.
18 (Pelew); Matschie (part), Journ. f. Ornith., 1901, p. 112
(Palau).
_Collocalia vanikorensis_ Gray, Hand-list Birds, 1, 1869, p. 66
(Pelew); Giebel, Thes. Ornith., 1, 1872, p. 737 (Pelew).
_Collocalia fuciphaga_ Oustalet (part), Nouv. Arch. Mus. Hist.
Nat. Paris, (3), 7, 1895, p. 189 (Palaos); Reichenow, Die Vögel,
2, 1914, p. 161 (Palau).
_Collocalia francica_ Takatsukasa and Kuroda, Tori, 1915, p. 53
(Pelew).
_Collocalia fuciphaga inquieta_ Kuroda (part), in Momiyama, Birds
Micronesia, 1922, p. 62 (Pelew).
_Collocalia unicolor amelis_ Kuroda (part), in Momiyama, Birds
Micronesia, 1922, p. 63 (Pelew).
_Collocalia fuciphaga amelis_ Hand-list Japanese Birds, rev.,
1932, p. 179 (Palau).
_Collocalia (vanikorensis) pelewensis_ Mayr, Amer. Mus. Novit.,
no. 828, 1936, p. 11 (Palau).
_Collocalia germani pelewensis_ Mayr, Amer. Mus. Novit., no. 915,
1937, p. 18 (Palau).
_Collocalia inexpectata pelewensis_ Peters, Check-list Birds
World, 4, 1940, p. 224 (Palau); Mayr, Birds Southwest Pacific,
1945, p. 292 (Palau); Baker, Smithson. Misc. Coll., vol. 107, no.
15, 1948, p. 63 (Garakayo, Peleliu).
_Collocalia vanikorensis pelewensis_ Hand-list Japanese Birds, 3d
ed., 1942, p. 199 (Babelthuap, Koror).
_Geographic range._--Micronesia: Palau Islands--Babelthuap, Koror,
Garakayo, Peleliu, Angaur.
_Characters._--Adult, according to Mayr (1935:3): "Small; tarsus
naked; upper parts dark fuscous-green, with a brownish tone on
back; crown not much darker than back; rump pale but no distinct
light gray bar across rump as in _C. spodiopygia_; color of the
rump showing much individual variation, bases of feathers always
being pale gray, but tips sometimes strongly glossy green; inner
margins of wing-feathers not particularly light; feathers of chin
and throat soft, with fuscous bases and rather sharply defined
silvery-gray edges, but no shaft-streaks; abdomen dull gray,
slightly darker than throat, inconspicuous shaft-streaks on breast
and abdomen, more pronounced shaft-streaks on under tail-coverts;
longest under tail-coverts fairly glossy green; white loral spot
inconspicuous."
_Measurements._--Measurements are listed in table 30.