Itoplectis melanocephala (Gravenhorst, 1829) (Hymenoptera, Ichneumonidae, Pimplinae), a solitary idiobiont endoparasite, is redescribed. Investigations on the development of the parasite on the newly discovered host wax moth Galleria mellonella (Linnaeus, 1758) (Lepidoptera: Pyralidae) were made. Under the laboratory conditions longevity of Itoplectis melanocephala females is between 24(st)-40(th) days, while in males it is 20(st)-30(th) days. The egg productivity and the hatching of eggs between maximum 6 11 -20(th) days. Durations of male wasp egg to pupal periods last for 7(st)-15(th) days, while it is found between 13(st)-18(th) days for females. On average of adult (male:female) sex ratio is 2:1.