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SPERM REPLACEMENT AND DEPLETION IN THE SPERMATHECA OF THE S AND CS STRAINS OF ONCOPELTUS FASCIATUS

New strains of O. fasciatus, reared at 30° C either on seeds of sunflower (strain S) or mixed sunflower and cashew nuts (strain CS), were used. Females of wild (+) or mutant (wb) genotype were mated in various sequences with + males (some of them chemosterilized or castrated) or wb males. Eggs of each clutch laid were counted and characterized as: infertile, or non‐viable (apparently fertile but unable to hatch), or hatching into + or wb nymphs. Mating with a second male (except a castrate) causes partial or complete replacement of the spermathecal store of spermatozoa provided by the first male. A model of the replacement mechanism is proposed, which suggests that a volume of semen five times greater than the capacity of the spermatheca must be transferred by the male to cause the complete disappearance of the previous store of sperm.