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Here we investigated the strong repellent odour emitted by two julids from the Caucasus, <jats:italic>Syrioiulus continentalis<\/jats:italic> (Attems, 1903) and <jats:italic>Pachyiulus krivolutskyi<\/jats:italic> Golovatch, 1977. By NMR and GC\u2013MS, as well as compound synthesis, we identified the major compound in the secretions of both species as 4-ethylhex-1-en-3-one. A second compound was tentatively identified as the dimer of the main compound as 2-ethyl-1-(6-(pentan-3-yl)-3,4-dihydro-2<jats:italic>H<\/jats:italic>-pyran-2-yl)butan-1-one. Both compounds amounting for more than 95% of the whole secretion. 4-Ethylhex-1-en-3-one was found for the first time as a naturally occurring compound, and due to its identification in millipedes of the order Julida we propose here the trivial name \u201cjulidone\u201d. 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