<br> Several thermophilous insect species have shown northward expansion in recent decades, and for some, it is only a matter of the recolonization of historic sites.<br> Acrotylus insubricus<br> and<br> A. longipes<br> are pontic-mediterranean species, and their northern edge is in Central Europe (Slovakia). Between 1890 and 1962, these species were known as rare in southern Slovakia, with<br> A. insubricus<br> found at five sites during that period and<br> A. longipes<br> found only once (1961) in southeastern Slovakia. Despite increased sampling efforts in Slovakia after 1997,<br> A. insubricus<br> was not documented between 1962 and 2019, and<br> A. longipes<br> was not found between 1961 and 2023. In 2016, we began regularly checking 53 sandy habitats in southern Slovakia;<br> A. insubricus<br> was found abundant in two sites in 2019 and in nine sites in 2024 and 2025, while<br> A. longipes<br> was found abundant in two sites in 2023 (Aug 21-Nov 3) and in three in 2024 and 2025 (Jun 21–Oct 25), always accompanied by<br> A. insubricus<br> . Recently, the edge of the northernmost range of<br> A. insubricus<br> in Central Europe was 48.53°N, and for<br> A. longipes<br> , it was 48.40°N. In this paper, we describe the distribution, abundance, phenology, and habitat of both species. Regarding habitat,<br> A. longipes<br> needs sandy bare ground with sparse psammophilous vegetation and impacted frequently by human interference, while<br> A. insubricus<br> is more eurytopic and also occurs on rocky steppes. We found only<br> A. insubricus<br> adults overwintering in all nine sites, but never<br> A. longipes<br> , which is different behavior than that of these species in the southern parts of the range. We suggest that<br> A. insubricus<br> and<br> A. longipes<br> have recolonized historical sites and spread into sandy, human-disturbed habitats.<br>
