compounds of the formula ## str1 ## wherein : z is ## str2 ## wherein x is an integer from 0 to 4 , n is an integer from 0 to 5 and r is defined below ; or ## str3 ## wherein n is an integer from 0 to 5 and r is defined below ; r is selected from the group consisting of : hydrogen ; c 1 - c 4 alkyl ; c 1 - c 4 alkoxy ; halogen ; nitro ; phenyl ; cyano ; phenoxy ; benzyloxy ; benzyl ; c 1 - c 4 dialkylamino ; c 1 - c 4 alkylthio ; or c 1 - c 4 haloalkyl ; and r 1 is a c 1 - c 4 haloalkyl other than a chloroalkyl , or a group of the formula ## str4 ## wherein r 4 is halogen , c 1 - c 4 haloalkyl or c 1 - c 4 haloalkoxy ; physiologically acceptable salts thereof . these compounds exhibit insecticidal and acaricidal activity .