Rhyzobius lophanthae Blaisdell (Coleoptera: Coccinellidae) is one of the most important predators of scale insects pests. In this study, development periods of immature stages of R. lophanthae onA.spidiotus nerii Bouche (Hemiptera: Diaspididae) at different constant temperatures (14, 16. 18. 20. 22. 24, 26, 28, 30. 32, 34 and 36 degrees C), 60% relative humidity and 16:8 hour photoperiod. were investigated. The parameters of the predator under different temperatures were calculated with RmStat-3.