The invention relates to new benzoylurea compounds having insecticidal and acaricidal activity, of the general formula ##STR1## wherein R.sub.1 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 ##STR2## wherein R.sub.2 is a hydrogen atom or an alkyl group having 1-4 carbon atoms; andR is a cycloalkyl group or 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 whereinR 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 para-phenylene group, andR is a whether or not substituted cyclohexyl-group, or a saturated bi- or polycyclic hydrocarbyl group having 8-14 carbon atoms, then B does not represent an oxygen atom.