The genus Trissolcus Ashmead is an egg parasitoid of the family Pentatomidae, of which species are used for biocontrol agents for sting bug pests. Until now, 8 species of Trissolcus were recorded from South Korea. In this study, two species, Trissolcus plautiae (Watanabe) and T. elasmuchae (Watanabe, 1954), are newly recognized from Korean peninsula. Diagnosis, photographs and key to species are provided.

• Sanghyeok Nam(Laboratory of Insect Biosystematics, Department of Agricultural Biotechnology, Seoul National University)
• Seunghwan Lee(Laboratory of Insect Biosystematics, Department of Agricultural Biotechnology, Seoul National University, Research Institute of Agriculture and Life Sciences, Seoul National University)