Park (2001) described a new species of Tisis Walker, which was the first lecithocerid recognized from Thailand. Subsequently, several taxonomic papers on the family in Thailand have been published, in which more than 50 new taxa were described (Park, 2002a-b; 2003a-c; 2004; 2005a-b; 2006a-b). For the genus Torodora Meyrick, Park (2002a, 2007) described 18 new species from Thailand. Recent study of the lecithocerid moths collected in Thailand during 1980 revealed two species with venation that does not match that of any of the known genera of the family. The two species look more or less similar each other in the forewing coloration, but the shape of the wings and their venation are quite different. Generally, for the genus-level taxonomy in the family Lecithoceridae, the wing venation has been treated as most important character distinguished genera, and many genera of the family, more than 40% of the known genera, were established as monotypic by early workers (Meyrick, 1925; Gozmäny, 1978), based on their different venations. Although the wing venation is an important character to define the generic status of the family, the combination of venations with the other morphological characters including genital character should be considered. For these reasons, many small genera of the family are needed to be revised with a result in comparison of more characters other than wing venation. In this study, two new genera, Caveana gen. nov. and Triviola gen. nov., belonging to the subfamily Torodorinae, based on Caveana diemseoki sp. nov. and Triviola puiensis sp. nov. are described. At the same time, two new Torodora species, T. karismata sp. nov. and T. youwon sp. nov., are also described from Thailand. Images of adults and genitalia are given. Specimens examined are based on the collection of the Osaka Prefecture University, collected in Thailand by Japanese specialists during 1980

• Sora Kim(1Insect Biosystematics Laboratory, Research Institute for Agricultural and Life Sciences, Department of Agricultural Bio-Technology, Seoul National University)
• Kyu-Tek Park(Fellow, The Korean Academy of Science and Technology, McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida)