The Antigastra catalaunlis is considered as one of the important insects attaking sesame crop in iraq. This study was conducted to explore an effective biological mean to control the pest. Larvae were collected and crushed to make suspensions earobicly and an earobicly at 28-32 Cº. Two kinds of bacteria were found infected the larvae Bacillus thuregiensis, Staphylococcus epidermidis. Biochemical assay's according to Kouches postulates were applied, and same result's were obtaind. The two species of bacteria were identified by the same bioassy's tests. So this finding is considered as first record for the two kinds of bacteria on this pest in Iraq.