Nemophora Hoffmannsegg, 1798 is a relatively large group in Adelidae, including about 350 species worldwide. Only 13 species are known to Korean insect fauna up to date. The present study is to report N. ochsenheimerella, which is new to Korea. N. ochsenheimerella is externally similar to N. wakayamensis but can be distinguished by having characters in male genitalia as follows: cucullus longer than N. wakayamensis and N. ochsenheimerella has two rows of curnus consisting of numerous minute spines.

The genus Nemophora Hoffmannsegg is the largest group belonging of the family Adelidae. Based on the material in the collections of the Kangwon Nat. University, Incheon University, and Korea National Arboretum, Korea, we found that three species Nemophora albiantennella Issiki, N. tyriochrysa Meyrick and N. wakayamensis Matsumura are known for the first time from Korea. Taxonomic notes and photographs of adults and male/female genitalia for the newly known species are provided.