In my previous report, the author mentioned the fact that the per cent of parasite emergence from the cold stored mummies was low and was thought to be attributed to the experimental procedure that the mummies were transferred promptly from 25℃ to 10℃ under the condition of low relative humidity in the storage chamber without paying any consideration on the importance of the humidity. In these experiments, the transference of mummies was conducted in inserting one more gradual step of 15℃-20℃ between 25℃ and 10℃ and the mummies were kept in 76% R. H. storage chamber. Thus, the author could get an excellent result that the per cent of the emergence of the parasites from the mummies stored for 90 days became double that of the mummies without making any gradual acclimatization of the temperature. Experiments Nos. 2 and 3 shown in Table 1 would indicate the possibility of its practical use in the case of mummy storage both from the biological and economical standpoints. However, these experiments involving acclimatization of the mealybug to different rearing temperatures have one drawback in that two or three degrees of rearing temperature and more time is required.