The Incurvariidae is a small, cosmopolitan family of approximately 100 described species and 11 genera. It is best represented in the Australian (endemic genus Perthida and several other undescribed genera and species, Nielsen and Common 1991) and Palearctic (Alloclemensia. Excurvaria, Incurvaria, Paraclemensia, Procacitas, and Subclemensia, Kozlov 1987, Kuprijanov 1992, 1993, Nielsen 1981) regions. It is poorly represented in Africa (Protaephagus capensis Scoble 1980), South America (Basileura, Simacauda Nielsen and Davis 1981, Parra and Ibarra 1994a), and North America (endemic Vespina quercivora*, Davis 1972) and one species each of Alloclemensia and Paraclemensia (Davis 1983, Nielsen 1981, 1982).
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