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John, thanks for the hint. According to Ramage 2017, the Drosophila common throughout the Soceity Islands is D. coffeina. Unfortunately, I could not find any keys that include this species or have clear illustrations, but the description of this species by Schiner 1868 read like a good match.

The (dipteran) fauna is poorly monitored here, especially on the more remote islands further away from Tahiti. I have already more than 10 new species records for French Polynesia and several more morphospecies that I still need to identify, including at least 3 morphospecies of Phoridae, one Conopidae, Hybotidae and Scatopsidae - all dipteran families that were so far unknown to occur in French Polynesia. Therefore, the literature on geographical distribution is not necessarily a good criteria to support morphological examinations.