N their pursuit of better things for better living, many animals have evolved Iefficient reproductive accessories that enable the female to store for long periods of time spermatozoa received from the male. In insects generally, and in Drosophila melanogaster in particular, the sperm-storage organs, of which there are two kinds, are peculiar structures whose modus operandi is not immediately apparent from direct inspection. Not only are the sperm-storage organs, the ventral receptacle and the spermathecae, highly specialized, but the sperm themselves are extraordinary structures, attaining in D. mekmogmter a length of

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