Toxicity of insecticide pyrethroid (Lambada) and carbamate (Methomyl) against, different immature stages (two, four, six and eight weeks age) and adult stage of Eobania vermiculata and Helicella vestalis by feeding using leaf dipping technique for seven days under laboratory conditions. The characteristics of the obtained toxicity lines were taken as a criterion for the comparison between the efficacy of estimated insecticides. The immature stages proved to be more susceptible to the toxic action of both tested insecticides than the adult stage of the two tested terrestrial snails. There is a revese relationship between stages of two species and toxicity of tested insecticides. On the other hand, data revealed that the H. vestalis was more sensitive to the tested insecticides; Lambada and methomyl than E. vermiculata. Also data indicated that Methomyl proved to be more effective as molluscicide than Lambada for the two investigated terrestrial snails.