| Abstract: | The caddisfly fauna of these islands now stands at 61 species. Trinidad contains 53 species of which 10 (19%) are endemic, Tobago 33 species of which 7 (21%) are limited to the island, and an additional 6 species (10%) are found on both islands, but not elsewhere. Twelve species are described as new: Cernotina hastilis (Tobago), Austrotinodes adamsae (Tobago), Xiphocentron piscicaudum (Tobago, Venezuela), X. stenotum (Tobago), X. prolixum (Trinidad), Leucotrichia botosaneanui (Trinidad, Tobago), L. tritoven (Trinidad, Tobago, Venezuela), Alisotrichia cyanolenos (Trinidad, Venezuela), Rhyacopsyche duplicispina (Tobago), Ochrotrichia (O.) trinitatis (Trinidad), Ochrotrichia (Metrichia) geminata (Trinidad, Tobago), and Marilia spinosula (Trinidad). Of the insular fauna, 38% is endemic to one or the other or both of the islands, another 5% is shared only with other Antillean islands, a further 18% is shared only with the Paria Peninsula, Venezuela, and the final 39% are more widespread on the Antillean islands and mainland.
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