Calling ceases in an adult female after mating and does not resume throughout the duration of the insects life. Calling was suppressed and oöcyte growth was stimulated by the presence of a spermatophore, by the implantation of a spermatophore and by mating with vasectomized males. Odthecal deposition in females mated with vasectomized males caused calling to resume. Smith and Schal found that ventral nerve cord transections, either immediately following copulation or after odthecal deposition, restored calling in mated females. Their experimental evidence suggested that termination of calling is moderated neurally by a two-stage process, initiated by placement of the spermatophore and maintained by the presence of sperm in the spermatheca.