Abstract
Here we present and discuss the record of the endangered species Isturgia roraria (Fabricius, 1776) in the Czech Silesia, originating from the Zlatohorská vrchovina (Zlatohorská Highlands) in the cadastral area of the village Dívčí Hrad (Bruntál District). The record confirms the presence of the species in Czech Silesia after more than 100 years and corresponds to its distribution in adjacent Poland. Together with the occurrence of I. roraria in the Bílé Karpaty Mts., this constitutes the only other known area of distribution in Czechia. In Silesia, the population of I. roraria is strictly associated with one of its host plants, Cytisus scoparius (L.), and with semi-ruderal habitats such as forest clearings, forest edges, clear-cuts and abandoned pastures. Current knowledge of the Lepidoptera fauna in the Zlatohorská vrchovina Highlands is very limited; therefore, detailed entomological surveys will likely reveal additional localities of the species (especially in the area defined by the settlements of Janov, Jindřichov, Krnov, Město Albrechtice and Slezské Rudoltice). The conservation status of the isolated Silesian population is unclear; however, considering its trophic and habitat associations, the Silesian population appears to be less threatened than the one in the Bílé Karpaty Mts.