Systematics; Nomenclature; New taxa; Combination; Synonymy; Taxonomy; Taxonomic position; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Land and freshwater zones; Palaearctic region Lepidoptera; Hymenopteran parasites; Parasitica; Parasite & hyperparasite records & systematics; Japan; Hymenopteran parasite & hyperparasite records & systematics Braconidae; Ichneumonidae; Hymenopteran parasites; Pteromalidae; Hyperparasitism on lepidopteran hosts; Japan Pteromalidae; Hymenopteran hosts; Braconidae & Icneumonidae; Hyperparasitism on lepidopteran hosts, records & systematics; Hyperparasitism; Braconidae & Icneumonidae hosts on lepidopteran hosts; Japan Parasitica; Lepidopteran hosts; Parasite & hyperparasite records & systematics; Japan; First records for 6 species & systematics; Parasite & hyperparasite records Dibrachys kojimae (Ishii 1938) (Pteromalidae); Comb nov; Transferred from; Euterus, p. 74 Euterus kojimae Ishii 1938 (Pteromalidae); Referred to; Dibrachys, p. 74 Euterus tabatae Ishii 1938 (Pteromalidae); New synonym; Of Mesopolobus subfumatus (Ratzeburg 1852), p. 71 Mesopolobus subfumatus (Ratzeburg 1852) (Pteromalidae); Syn nov; Pteromalus matsukemushii Matsumura 1926, p. 71; Syn nov; Euterus tabatae Ishii 1938, p. 71 Mesopolobus tortricidis (Pteromalidae); Sp nov; Japan, host Choristoneura diversana (Lepidoptera); P. 73, fig'd Mokrzeckia abietis (Pteromalidae); Sp nov; Japan, host Macrocentrus resinella; P. 68, fig'd Pteromalus matsukemushii Matsumura 1926 (Pteromalidae); New synonym; Of Mesopolobus subfumatus (Ratzeburg 1852), p. 71