Novel isoxazolines of the formula (I) wherein A represents C or N; R representshaloalkyl; X represents halogen or haloalkyl; 1 represents 0, 1 or 2; Y representshalogen, alkyl, alkoxy, haloalkyl, cyano, nitro, amino, acylamino, alkoxycarbonylamino,haloalkoxycarbonyl-amino or alkylsulfonylamino; m represents 0, 1 or 2; andG represents any one selected from heterocyclic groups described in the specification;and a use thereof as insecticides and for controlling animal parasites.