Mine and gall makers among Lepidoptera are found in the family Gracillariidae. The genus Borboryctis Kumata et Kuroko, 1988, have 2 species B. euryae Kumata et Kuroko and B. triplaca (Mayrick). B. euryae is known a gall maker of Eurya spp. In this study, Borboryctis euryae Kumata et Kuroko, 1988 feeding on Eurya japonica Thunb. and E. emarginata Makino (Theaceae), is reported for the first time from Is. Jeju and Geoje, Korea. The host plant, Eurya spp. an evergreen tree, is widely distributed in East Asia including Korea. The early instar larva makes linear mine near the surface of the leaves and mature larva makes gall on the leaves of the host plant. Larval frass ejected behaviour were not observed. The mature larva makes a light brown spindle-shape cocoon on the somewhere of the host plant, mainly edge of the leaf. The descriptions and figures of the male and female genitalia, mine, gall, larvae and pupae in immature stages, are provided.