Ethmia dehiscens is a moth in the Depressariidae family. It was described by Meyrick in 1924. It is found in China (Sichuan). The wingspan is about 31 mm. The forewings are pale grey with black markings, consisting of two small oval spots beneath the costa towards the base, an interrupted streak on the fold from the base to one third, a short mark on the dorsum at one-fourth and one towards the dorsum before the middle. The stigmata forms small spots, the plical obliquely beyond the first discal, with a streak projecting from the second discal to near the first. There are two interneural streaks above the cell before and beyond the middle of the wing and a sinuate transverse series of six posteriorly, not reaching the cell or margin, the first and fourth of these longest, the two lowest li