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Le mâle de Brachyptera braueri introduit d'abord son epiprocte dans le vagin. Apres une longue phase de stimulation, il depose un spermatophore externe. Chez les Brachyptera, il existe une correlation interspecifique entre la longueur des filaments de l'epiprocte et du flagelle du paraprocte droit des mâles et la longueur du canal du receptacle seminal des femelles. Les œufs de B. braueri eclosent au bout de trois a sept semaines. Ceux de Periodes microcephalus eclosent soit deux a cinq mois apres la ponte, soit un an apres. La chetotaxie des premiers stades larvaires des deux especes est decrite et figuree en detail. Les transformations evolutives du stade I et de l'adulte montrent un curieux paral­ lelisme, a la fois pour les cerques des Nemouroidea et les pieces buccales des Subulipalpia. Mating, incubation period of the eggs, and first larval stages of Brachyptera braueri and Periodes microcepbalius (Plecoptera). The male Brachyptera braueri first introduces his epiproct into the vagina and after a long phase of stimulation, he deposits a spermatophore externally. In the genus Brachyptera, there is an interspecific correlation between the length of the filaments of the epiproct and the flagellum of the right paraproct of the males and the length of the canal of the seminal receptacle in the females. The eggs of B. braueri hatch at the end of 3 - 7 weeks, whilst those of Periodes micro­ cephalus hatch either 2 - 5 months after oviposition or one year after. The chaetotaxy of first-instar larvae of both species is described and illustrated in detail. The evolutional transformations of the first larval stage and the adult show an interesting parallelism, together with the cerci of the Nemouroidea and the buccal parts of the Subulipalpia.

Accouplement, période d'incubation et premiers stades larvaires de Brachyptera braueri et de Perlodes microcephalus (Plecoptera)