_Aphanolimnas monasa_ (extinct?), _Ptilinopus porphyraceus_, and _Ducula
oceanica_ are the only species of birds which have reached Micronesia
directly from Polynesia. There are in Micronesia, as Mayr (1941b: 204)
points out, eight species "which are members of typically Polynesian
species or genera" and six species which are either Papuan or
Polynesian. The relationships between Polynesian and Micronesian birds
is evident, but insofar as the pathways of colonization are concerned
the majority of these Micronesian species listed by Mayr have come from
elsewhere than Polynesia and the birds of these two areas are thought to
have arisen from common ancestors. _Aphanolimnas_, _Ptilinopus_, and
_Ducula_ apparently invaded Micronesia from Central Polynesia _via_ the
Marshall Islands through a rather continuous chain of islands and
atolls. _Aphanolimnas_ is known only from Kusaie in the extreme eastern
part of the Carolines while _Ptilinopus_ and _Ducula_ are known from the
Marshalls, Carolines, and Palaus.