The reproductive capacity of females of Apanteles galleriae (Wilkinson, 1932) was evaluated in fifth instar caterpillars of Galleria mellonella (Linnaeus, 1758) and Achroia grisella (Fabricius, 1754) fed on standard diet and diets enriched with protein. The reproductive capacity of parasitoid females on fifth instar caterpillars of G. mellonella and A. grisella with variable weight was also evaluated. The host weight interfered in the sex ratio of the obtained parasitoids. In heavier caterpillars, the investment in female descendants was greater than in males, and in lighter caterpillars the inverse occurred. Biometrics; Reproduction; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology Achroia grisella; Galleria mellonella (Pyralidae ); Weight; Larval weight; Hymenopteran parasites; Apanteles galleriae; Parasite reproductive productivity & population dynamics, influences Apanteles galleriae (Braconidae); Reproductive productivity; Lepidopteran hosts; Achroia grisella & Galleria mellonella; Population dynamics; Lepidopteran host use significance none