Examination of the large series of birds taken by Coultas at Ponapé shows the presence of three types of plumages. The writer has not made a thorough diagnosis of these plumages, but suspects that the phenomenon obtained here is the same as was found by Mayr (1933e) in his study of _Neolalage banksiana_ (Gray), which is a related bird. Immatures of _E. t. insperatum_ seemingly present two plumages, which, if Mayr's arrangement is followed, may be interpreted as a more primitive or "retarded" type in one case, with less striking plumage, barred with black and buff, and a more advanced or "progressive" type in the other case, with plumage of the latter resembling more the adult type, especially the adult female. It was not ascertained whether any of these specimens represented adult birds in "retarded" plumage. _Remarks._--The Cicada Bird at Ponapé resembles in habits its related subspecies at Palau. Coultas (field notes) writes that it is a forest bird, with retiring habits. He observed the birds in small groups, and describes their musical call notes as "to-to-wee, to-to-wee" repeated several times. _Evolutionary history of Edolisoma tenuirostre in Micronesia._--Mayr (in Stresemann, 1939:126) first pointed out the close relationship between the cicada birds of Micronesia and _Edolisoma tenuirostre_ of the Solomon Islands. Up to that time the Micronesian birds were considered to belong to the genus _Lalage_. The cicada birds probably invaded Micronesia along two independent routes from a dispersal center in the Papuan area. The form at Palau, _E. t. monachum_, resembles closely several of the subspecies to the south and southwest, particularly those in the New Guinea area. Aside from the smaller size of the Palau form there are differences in coloration between this bird and those of Melanesia. In the adult female and the juvenile there are differences in the amount of barring on the underparts and in the shade of color on the upper parts. In the adult male there are differences in the marginal coloring of the primaries and secondaries. _E. t. nesiotis_ may have arrived at Yap from Palau. Little is known concerning the taxonomic position of this bird. On the basis of the information available, it appears closer to the Palau bird than the Ponapé bird in color; however, in size it probably more closely approaches the latter subspecies.