Idiomictis aneuropa is a moth in the Xyloryctidae family. It was described by Meyrick in 1935. It is found on Fiji. The wingspan is about 18 mm. The forewings are whitish-grey-ochreous, thinly sprinkled dark brownish, especially posteriorly. There is a dark fuscous dot on the base of the costa, one on the middle of the costa, and a series around the posterior third of the costa and termen. The first discal and plical stigmata are dot-like and dark fuscous, the plical obliquely anterior, the second discal forming a small whitish transverse mark edged laterally dark fuscous. The hindwings are grey.