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The pantropic ant species Strumigenys emmae (Emery, 1890) was found in Poland and Europe for the first time. Two workers were shifted from humid soil in greenhouse in Poznań, Poland. This species coexists with two other tramp ant species – Hypoponera ergatandria (Forel, 1893) and Tetramorium insolens (Smith, 1861) in the same pavilion, as well as with one species native to Poland – Lasius niger (Linnaeus, 1758), which occasionally forages and nests in the building. Ethological assays with all four species were performed and their possible interactions are discussed. Number of tramp ant species found indoors in Poland is raised to 7 and total number of ant species recorded from the country is raised to 108.