Article révisé par les pairs
Résumé : Bilateral ablation of the corpora cardiaca and corpora allata of larval Lampyris noctiluca may result in sexual inversion. Larval males operated at a time near to the third molt (molt of sexual differentiation) become females. The operation does not, however, result in sexual inversion in older larval males (5th stage) or in any larval females (4th, 5th, and 6th stages). It is suggested that the feminization of young larval males results from a "feminization" of the pars intercerebralis. A hypothesis regarding the endocrine control of male differentiation is proposed. It is suggested that genetic sex determination produces a specific activity in some neurosecretory cells of the pars intercerebralis, and that this induces the formation of the testicular apical tissue which is the source of the androgenic hormone. No such endocrine control has so far been revealed in females. © 1966.