The influence of temperature and relative humidity on life table parameters of Phyllocoptruta ofeivora (Ashmead) CRM and Aculops pele­kassi (Keifer) PRM was determined in outside condition tests. Both erio­phyoid mites developed and reproduced readily when fed on "Hamlin" or­ange Citrus sinensis (L.). Life table parameters were calculated at 17°C and 78% RH; 22°C and 75% RH; 27°C and 77% RH for PRM and continue to 30°C and 84% RH; and 32°C and 88% RH for CRM. The developmental time for female immature stages averaged 3.210.673 days at 32°C, with the intrinsic rate of increase (^rm) value of 0.350 for CRM; and 6.411.122 days at 27°C, with the intrinsic rate of increase (rm) values of 0.192 for PRM. The time threshold of development was 11⁰C and oviposition ceased at 10⁰C for both eriophyoid mites. Mortality from egg to adult stages was high (53.06%) at 17°C and decreased to 25.81% and 26% at 30°C and 32°C for CRM, respectively, while, the opposite occurred with PRM, the highest mortality was 48.59% at 27⁰C and de­creased to 32.25% at 17°C. The optimum temperature for CRM to de­velop and increase on "Hamlin" orange was 30°C to 32°C, while, that for PRM was 22°C to 27°C.