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The thrips fauna of Norfolk Island is a curious mix of endemics and adventives, with notable absences that include one major trophic group. A brief introduction is provided to the history of human settlement and its ecological impact on this tiny land mass in the western Pacific Ocean. The Thysanoptera fauna comprises about 20% endemic and almost 50% widespread invasive species, and shows limited faunal relationships to the nearest territories, Australia, New Caledonia and New Zealand. This fauna, comprising 66 species, includes among named species 29 Terebrantia and 33 Tubulifera, with four Tubulifera remaining undescribed. At least 12 species are endemics, of which 10 are mycophagous, and up to 10 further species are possibly native to the island. As with the thrips fauna of most Pacific islands, many species are widespread invasives. However, most of the common thrips of eastern Australia have not been found on Norfolk Island, and the complete absence of leaf-feeding Phlaeothripinae is notable. The following new taxa are described: in the Phlaeothripidae, Buffettithrips rauti gen. et sp. n. and Priesneria akestra sp. n.; and in the Thripidae, Scirtothrips araucariae sp. n. and Thrips merae sp. n.

Twenty-two species of Hydroptilidae are described from North Sulawesi, comprising the first record of this family from Sulawesi and providing further insight into the nature of the Oriental fauna. The species fall into eight genera in three Hydroptilinae tribes: (I) Stactobiini: Chrysotrichia Schmid (3 spp.), Parastactobia Schmid (1 sp.), Scelotrichia Ulmer (1 sp.), Plethus Hagen (1 sp.); (2) Hydroptilini: Hydroptila Dalman (7 spp.), Oxyethira Eaton (1 sp.), Hellyethira Neboiss (1 sp.); (3) Orthotrichiini: Orthotrichia Eaton (7 spp.). Descriptions of 18 new species are based primarily on adult males, but females of many are described and some immatures, including the hitherto unknown 5th-instar larvae, pupae and cases of Chrysotrichia and Scelotrichia. Keys to genera are provided for adults and cased larvae. In addition, keys are provided to males and females of Hydroptila and males of Chrysotrichia and Orthotrichia. A checklist of the Hydroptilidae of North Sulawesi is appended. The considerable intra-specific variation across the wide Australasian-SE. Asian ranges of Hydroptila obscura Wells, H. incertula Mosely and Oxyethira incana Ulmer is discussed, and the New Guinean H. explicata Wells is synonymised with H. obscura. Asseseement of variability in several genera leads to a redefinition of Chrysotrichia and the synonymy of Madioxyethira Schmid and Pseudoxyethira Schmid with Scelotrichia Ulmer. Relationships of stactobiine genera are considered.