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Three species of grass moths (Crambidae) were recorded for the first time in Croatia. Udea alpinalis and Crambus ericella were found on the peaks of Mts. Guslica and Snježnik in Gorski Kotar region, while Catoptria pyramidellus was recorded on various mountain chains across the country. The discovery of three montane species in Croatia demonstrates the lack of Microlepidoptera surveys in these areas and the need for further research.