it has now been found that certain novel heterocyclic derivitives have provided unexpected insecticidal activity . these compounds are represented by formula : r preferred are those compounds of formula where r 2 and r3 taken together is ═ nchchn —, ═ nc ═ cn —, or ═ chn ═ cn —, and tautomers thereof , and where r 4 and r 5 taken together is — c ═ cc ═ c 1 12 , -, where r , r , r6 , r7 , r8 , ri1 , r r13 , r14 , and x are described . in addition , compositions comprising an insecticidally effective amount of at least one compound of formula , and optionally , an effective amount of at least one of a second compound with at least one insecticidally compatable carrier are also disclosed ; along with methods of controlling insects comprising applying said compositions to a locus where insects are present or are expected to be present .