The invention relates to new benzoylurea compounds having insecticidal and acaricidal activity, of the general formula wherein R1 is a hydrogen atom or represents 1 or 2 halogen atoms; Ar is a para-phenylene group or a para-pyridylene group, which groups may be substituted with 1 or 2 substituents selected from the group consisting of chlorine, methyl and trifluoromethyl; B is an oxygen atom or represents a group having the formula or wherein R2 is a hydrogen atom or an alkyl group having 1-4 carbon atoms; and R is a cycloalkyl group, a cycloalkenyl group having 6-12 carbon atoms, which groups may be substituted with 1-3 substituents selected from the group consisting of alkyl and alkenyl having 1-6 carbon atoms, or wherein R is a bi- or polycyclic, saturated or unsaturated, hydrocarbyl group, having 8-14 carbon atoms and, if desired, substituted with 1-3 substituents selected from the group consisting of alkyl and alkenyl having 1-6 carbon atoms; with the proviso, that, if Ar is a whether or not substituted paraphenylene group, and R is a whether or not substituted cyclohexylgroup, or a saturated bi- or polycyclic hydrocarbyl group having 8-14 carbon atoms. then B does not represent an oxygen atom.