_Remarks._--The difference in coloration between the adults and immatures has resulted in considerable confusion concerning the taxonomy of this subspecies. According to Wiglesworth (1891a:15), the name _Halcyon reichenbachii_ was established by Gustav Hartlaub in 1852 for a kingfisher with a white abdomen in the Dresden Museum, which had been figured by Reichenbach (Synopsis Avium, Alcedineae, 1851) and called _Todiramphus cinnamomina_. This specimen had been mislabeled and Hartlaub and Finsch (1868a:4), noting a resemblance between this bird and specimens from the Palau Islands, used the name _H. reichenbachii_ for the birds from the Palaus. Later, when specimens from Ponapé were taken, Hartlaub's bird was found to be identical with them; thus the name _H. reichenbachii_ could be restricted to the bird at Ponapé, and Wiglesworth supplied the new name _H. pelewensis_ for the population at Palau. _H. mediocris_ was used by Sharpe to designate the cinnamon-breasted birds at Ponapé, because they were assumed to belong to a species different from the white-breasted ones. This confused situation was not clarified until additional collections were obtained by the Japanese. Coultas (field notes) comments on the conspicuously different field characters of the two color types in this bird. In 1930, he found the bird common and usually in marginal habitat in the lowlands and at the edges of mangrove swamps. _Evolutionary history of Halcyon cinnamomina._--The three races of kingfishers belonging to the species _H. cinnamomina_ have been derived from _H. chloris_. The principal distinction between the two species is the presence of the cinnamon coloring in _H. cinnamomina_, although within _H. chloris_ there are some subspecies possessing traces of this coloration. The link between these two species, as pointed out to me by Mayr, appears to be _H. chloris matthias_ Heinroth of the St. Matthias and Squally islands, which is colored like _H. chloris_ except that on the head, especially on the occiput, there is a faint wash of color ranging from buff to ochre. This coloration of the head is a step toward the condition in the Micronesian populations of _H. cinnamomina_.