Profenusa thomsoni (Konow, 1886)

Japanese name: Tomuson-hamuguri-habachi

Material examined. HOKKAIDO: 1 $, Iwamizawa, Kurisawa, Mt. Sankaku-yama, 43°05′N 141°58′E, 1. VII. 2022, oviposited in Betula ermanii in captivity, H. Hara; 1$ (HH220801B), same data but coll. larva mining leaf of Betula ermanii, 1. VII. 2022, mat. 6. VIII., em. 29. VIII. 2022.

Host plants. Betulaceae: Betula ermanii Cham. (new record), Betula platyphylla Sukaczev var. japonica (Miq.) H.Hara (Shinohara and Hara, 2015) in Japan. For the host plants outside Japan, see Taeger et al. (1998).

Remarks. This sawfly is associated with various species of Betula .