Compounds of the formula ##SPC1##Whereinn represents the numbers 0 or 1,Z represents oxygen, ##EQU1## or sulphur R.sub.1 represents the groups ##SPC2##WhereinR.sub.5 represents hydrogen, halogen, C.sub.1 -C.sub.5 -alkyl, ethynyl, C.sub.1 -C.sub.4 -alkylthio, C.sub.1 -C.sub.5 -alkoxy, C.sub.3 -C.sub.5 -alkenyloxy, C.sub.3 -C.sub.5 -haloalkenyloxy, C.sub.3 -C.sub.5 -alkynyloxy, nitro, cyano, C.sub.2 -C.sub.5 -alkoxycarbonyl, C.sub.3 -C.sub.5 -alkenyloxycarbonyl, C.sub.3 -C.sub.5 -alkynyloxycarbonyl, C.sub.1 -C.sub.3 -alkanoyl, C.sub.1 -C.sub.4 -alkylcarbamoyl, (di-C.sub.1 -C.sub.4 -alkyl)carbamoyl,R.sub.6 represents hydrogen, halogen, methyl, ethyl, isopropyl or methoxy, andR.sub.8 represents hydrogen or n-propyl,R.sub.2 represents hydrogen, methyl or ethyl,R.sub.3 and R.sub.4 each represent hydrogen, methyl, ethyl, methoxy, ethoxy, nitro or halogen, andR.sub.7 represents hydrogen or C.sub.1 -C.sub.2 -alkanoyl,And their use for combating insects and members of the order acarina are disclosed.