In _H. c. pelewensis_ and _H. c. reichenbachii_, the adult birds resemble each other, although the former subspecies is slightly smaller. The immatures of _H. c. reichenbachii_, however, possess cinnamon coloring on the cheeks, sides of body, and breast in addition to that present on the crown and nape. The crown and nape are of this same color in the adults. In the subspecies at Guam, _H. c. cinnamomina_, the adult male has the immature type of plumage found in _H. c. reichenbachii_. The female of _H. c. cinnamomina_ has this cinnamon coloring on the throat, but the breast, abdomen and under tail are white. The original stock from which the Micronesian birds came may have invaded the area via the Palau Islands, although Mayr (1940) is of the opinion that they reached Micronesia via Ponapé (eastern Carolines) and spread to Guam and Palau. He states further (1942b:181, 182) that the presence of _H. cinnamomina_ and _H. chloris_ as reproductively isolated groups in the Palaus may not indicate that they are distinct species, but that they represent the overlap of terminal links of the same species, which have diverged to such an extent as to leave these terminal links reproductively isolated. =Halcyon chloris teraokai= Kuroda White-collared Kingfisher _Halcyon chloris teraokai_ Kuroda, Tori, 1, 1915, p. 56, pl. 3, fig. 3. (Type locality, Pelew.) _Halcyon albicilla_ Hartlaub, Proc. Zool. Soc. London, 1867 (1868), p. 828 (Pelew); Hartlaub and Finsch, Proc. Zool. Soc. London, 1868, pp. 4, 118 (Pelew); Gray (part), Hand-list Birds, 1, 1869, p. 93 (Pelew); Finsch, Journ. Mus. Godeffroy, 8, 1875, p. 49 (Palau, Mackenzie, Matetotas); Oustalet (part), Nouv. Arch. Mus. Hist. Nat. Paris, (3), 7, 1895, p. 171 (Pelew). _Halcyon chloris_ Hartlaub and Finsch, Proc. Zool. Soc. London, 1872, pp. 89, 93 (Pelew); Finsch, Journ. Mus. Godeffroy, 8, 1875, pp. 4, 10 (Palau); Wiglesworth, Abhandl. und Ber. Zool. Mus. Dresden, no. 6, 1890-1891 (1891), p. 14 (Pelew); Mayr, Amer. Mus. Novit., no. 469, 1931, p. 3 (Pelew). _Dacelo albicilla_ Giebel (part), Thes. Ornith., 2, 1875, p. 1 (Pelew). _Halcyon sanctus_ Finsch, Journ. Mus. Godeffroy, 8, 1875, p. 50 (Palau); Sharpe, Cat. Birds British Mus., 17, 1892, p. 267 (Pelew). _Dacelo albicilla_ Giebel (part), Thes. Ornith., 2, 1875, p. 1 (Pelew). _Sauropatis chloris_ Salvadori, Ornith. Papuasia, 1, 1880, p. 470 (Pelew).