Contrôle hormonal du développement de l’appareil copulateur mâle au cours de la métamorphose d’Aeshna cyanea (Müller) (Anisoptera: Aeshnidae)

. In A. cyanea, molting hormone and juvenile hormone control the metamorphosis of the copulatory apparatus. Two experiments have been carried out: (1) ablation of the molting glands during the first day of the last larval instar; (2) injection of a juvenile hormone mimic (farnesyl methyl ester) at various times during this instar. The arrest of molting hormone secretion stopped the development of the copulatory organ. Injection of juvenile hormone, if performed before the seventh day of the last larval instar, also inhibited this development.