Re-investigation of the aerial parts of Ethulia conyzoides from Egypt afforded two new monoterpene 5-methylcoumarins, namely 5'-epi-isoethuliacoumarin B and 5'-epi-isoethuliacoumarin A, and a new monoterpene acetophenone derivative, ethuliaconyzophenone, in addition to the five known compounds, ethuliacoumarin, cycloethuliacoumarin, isoethuliacoumarin A, isoethuliacoumarin B and 4-hydroxy-5-methylcoumarin-4-O-β-D-glucopyranoside.