The life cycles of two predatory stink bugs Cazira verrucosa and Eocanthecona concinna (Heteroptera: Pentatomidae) were studied in the laboratory under L:D 14:10 regime with temperature controlled at 23 ± 3℃ and relative humidity at 70%. E. concinna were fed with blowfly larvae, C. verrucosa with Aulacophora indica. Eggs were laid in egg masses. For E. concinna there were 60 eggs per mass and for C. verrusoca there were only 7.7 eggs per mass. The egg stage for E. concinna and C. verrucosa was 8.0 and 7.7 days, respectively. For both species there were 5 stadia. For E. concinna, the body length of five instars was 1.48, 1.97, 3.74, 6.64 and 9.89 mm, and the stadia duration was 4.6, 5.2, 5.4, 6.1 and 10.3 days, respectively. For C. verrucosa, the body length of five instars was 1.33, 2.75, 3.75, 5.12 and 7.56 mm and the stadia duration was 4.0, 4.2, 5.4, 5.0 and 10 days, respectively.