none LEPIDOPTERA-; HYMENOPTERAN-PARASITES; Microplitis croceipes; Atypical host acceptance, laboratory study Microplitis croceipes; EGG-LAYING; Oviposition, atypical lepidopteran host acceptance; LEPIDOPTERAN-HOSTS; Atypical host acceptance, laboratory study Comparisons were made of the acceptance for oviposition by the endoparasitoid, Microplitis croceipes (Cresson), of six atypical lepidopteran hosts with two typical hosts, the corn earworm, Helicoverpa zea (Boddie), and the tobacco budworm, Heliothis virescens (F). The atypical hosts were: the fall armyworm, Spodoptera frugiperda (J.E. Smith); the beet armyworm, S. exigua (Hubner); the Indianmeal moth, Plodia interpunctella (Hubner); the cabbage looper, Trichoplusia ni (Hubner); the greater wax moth, Galleria mellonella (L.); and the diamondback moth, Plutella xylostella (L.). The acceptability of the atypical hosts for parasitoid oviposition was investigated after treatment of host larvae with corn earworm hemolymph, corn earworm frass, corn earworm frass plus corn earworm hemolymph, and also after exposure of host larvae to female parasitoids together with corn earworm larvae. Fall armyworm larvae were significantly more acceptable for oviposition by parasitoid females than the other atypical hosts, when untreated. The corn earworm frass plus hemolymph treatment had the most pronounced effect on the mean number of eggs laid/host across all six atypical species, followed by corn earworm hemolymph gt corn earworm larvae gt corn earworm frass.