Two species of the family Trapeziidae, one species of the family Oziidae, and 15 species of the family Xanthidae are recorded from the Ogasawara Islands. Among them, one new species of the Xanthidae is described and named Actaeodes ogasawaraensis. Otherwise, Paractaea retusa (Nobili, 1905) (Xanthidae) is new to Japanese waters, and Eupilumnus globosus (Dana, 1852) (Oziidae), Liocarpilodes harmsi (Balss, 1934) and Pseudoliomera variolosa (Borradaile, 1902) (Xanthidae), are new to the Ogasawara Islands. Pseudoliomera paraspeciosa (Ward, 1941), which has been recorded from the Ogasawara Islands based on the wrong identification, is correctly identified in this paper based on the new specimens as the first not only for the Ogasawara Islands, but also for Japanese waters. Carpilodes albolineatus Serène and Nguyen, 1961, is synonymized with Liomera rubra (A. Milne-Edwards, 1865).

Based on a successful result of “emergence trapping using dead branches” (ETB), Betula ermanii Cham. (Betulaceae) is recorded as a host plant of Konowia yasumatsui (Togashi, 1972) (Xiphydriidae). The host plant of this woodwasp was unknown. Konowia yasumatsui is recorded from Gunma prefecture for the first time.

In the course of biological inventory by FRI, Myanmar and NMNS, Japan conducted in Yezin, Nay Pyi Taw in July 2023, 23 pselaphine species from 182 specimens were recognized. Two species of which, Methorius truncaticollis Jeannel, 1952 and Eupines crinita Li et al., 2022 are recorded from Myanmar for the first time.