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During investigation of jumping plant lice in Serbia, the presence of Psyllopsis fraxinicola was registered on different ash tree species (F. excelsior L., F. angustifolia Vahl.) in a few localities. Psyllopsis fraxinicola is widespread in the Palearctic region and has been introduced more recently to North and South America and Australia. Until now it was unknown in Serbia. The aim of the study was to determine the basic morphological properties of its development stages and discribe its life cycle.