Thiotricha angelica is a moth of the Gelechiidae family. It was described by Bradley in 1961. It is found on Guadalcanal. The wingspan is about 12 mm. The forewings are shining white with the anterior edge of the costa fuscous near the base and with an inwardly-oblique fuscous-black streak from the apex, heavy and tear-shaped in males, linear and reaching as a slightly sinuous line to the dorsum a little beyond the tornus in females. In both sexes this streak is preceded by a small somewhat triangular patch of apricot suffusion extending beyond the streak to the tornus. The hindwings are white.