DION, N., and F. M~NVIELLE. 1985. The effects of alternated cycles of full-sib and random mating on selection for pupa weight in Tribolium castaneum. Can. J. Genet. Cytol. 27: 251 -254. Individual responses to selection for high pupal weight in Tribolium castaneum under two types of mating, cyclic full-sib random-mating system and random mating, were observed for 15 generations. No significant differences have been observed between the two types of mating for the selection response, differential selection, realized heritability, and the number of larvae per generation. Realized heritability of the pupal weight was 0.33 5 0.02 and 0.42 -+ 0.02 for the inbred lines and for the random-mated lines, respectively. DION, N., et F. MINVIELLE. 1985. The effects of alternated cycles of full-sib and random mating on selection for pupa weight in Tribolium castaneum. Can. J. Genet. Cytol. 27: 25 1 -254. On a observk pendant 15 gknkrations les rksultats sur les individus de la sklection visant un poids klevk des pupes chez Tribolium castaneum soumis a deux types d'appariement: un cycle d'appariement pleins-frkres alkatoire et I'appariementalkatoire. On n'a pas note de diffkrence significative entre les deux types d'appariement relativement a la rkponse a la sklection, la sklection diffkrentielle, I'hkritabilitk obtenue et le nombre de lames par gknkration. L'hkritabilitk obtenue du poids de la pupe fut de 0,33 + 0,02 et 0,42 + 0,02 pour les lignkes consanguines et les lignees d'appariement alkatoire, respectivement.