Thiotricha aucupatrix is a moth of the Gelechiidae family. It was described by Meyrick in 1929. It is found in Peru. The wingspan is about 8 mm. The forewings are silvery-white with a very oblique blackish line from the costa at two-thirds, and a fine dark fuscous line from the anterior extremity of a dash on the end of the fold, converging to a round black apical dot. The hindwings are rather dark grey.