Remote oceanic islands develop faunas that are disharmonic, not including the full complement of species found on mainland areas. Freshwater habitats are uncommon on Maupiti in French Polynesia. There are no flowing streams remaining on this island. Using yellow pan trap samples collected on Maupiti—a volcanic high island with exposed coral islets in French Polynesia’s Society Islands—we compare the diversity of aquatic and semi-aquatic flies (Diptera) between various shoreline habitats and across a three-month period of collection. Four habitats were sampled: coral-islet ocean-side beach, coral-islet lagoon-side beach, high-island lagoon beach, and high-island inland. Diptera studied are species from the families Asilidae, Ceratopogonidae, Chironomidae, Chloropidae, Culicidae, Dolichopodidae, Empididae, Ephydridae, Sphaeroceridae, and Tipulidae.  In this study, species distribution is correlated with vegetation and other habitat features.  Distribution and abundance fluctuations over the three-month period are also documented and generalizations made to those documented elsewhere on oceanic islands.