Novel Δ 1 -pyrroline of formula (I), a number of methods for their preparation, and their use for controlling pests are disclosed:n n n n n n n n Wheren n n R 1 , R 2 , R 3 , R 4 , A 1 , A 2 , R 5 , R 6 , R 7 , R 8 , R 9 and Q have the meanings mentioned in the specification.