Abstract
Gibbovalva tricuneatella (Meyrick, 1880), comb. nov., which has been referred to the genus Acrocercops Wallengren, 1881 for a long time, is redescribed on specimens reared from leafmines on Typha domingensis (Typhaceae) at Okinawa-honto, Ryukyu, southern Japan. The wing venation and genitalia of both sexes are illustrated for the first time. Biological notes are given on observations at Okinawa-honto. The species is transferred to the genus Gibbovalva Kumata & Kuroko, 1988 mainly on the structures of the male genitalia.
