Modified BS translocation males were developed at 26.0° C where univalentbearing gametes are recovered with less than half the frequency than at 18.0° C. Upon eclosion the males were stored for definite time periods at either temperature before mating individually to single y free-X females. the transfer cultures of the females show a higher frequency of recovery of univalent-bearing progeny regardless of the temperature or storage treatment of the male. In addition, postmeiotic temperature treatment does not appear to fundamentally alter the overall frequency of recovery of univalent-bearing gametes which is presumably determined by the developmental temperature of the male. A similar trend is observed for matings of y females to single X.YSYL/O males in which the males were developed and stored at 26.0° C; namely, a higher frequency of recovery of attached-XY gametes in the transfer cultures.