none Galleria mellonella; Yponomeuta malinellus; LIPIDS-; Fatty acid composition, hymenopteran parasitoid relationships; HYMENOPTERAN-PARASITES; Itoplectis maculator; Parasitoid fatty acid composition, host influence Itoplectis maculator; LIPIDS-; Lepidopteran host & sex influences; PHYSIOLOGICAL-AND-BIOCHEMICAL-SEX-DIFFERENCES; Lepidopteran host influences; LEPIDOPTERAN-HOSTS; Galleria mellonella & Yponomeuta malinellus; Parasitoid fatty acid composition, host influence Fatty acid compositions of adult females and males in Itoplectis maculator reared on two hosts species, Yponomeuta malinellus and Galleria mellonella, and of their hosts, were investigated by GLC in host-parasitoid relationship. In fatty acid compositions of adult parasitoids and hosts, oleic, palmitic, linoleic and linolenic acid were predominant. It was showed that fatty acid compositions of parasitoid were effected by that of hosts.