Palaeoleptochromus schaufussi(gen.nov., sp.nov.) is the first antlike stone beetle (Coleoptera: Scydmaenidae) to be described from Cretaceous amber. The piece of amber containing this specimen was collected in an area near Grassy Lake, Alberta, Canada, and is dated 79 million years old. This new genus is placed within the Mastiginae and is most likely the sister taxon to the recent Neotropical genusLeptochromusMotschulsky.