Thiotricha amphixysta is a moth of the Gelechiidae family. It was described by Meyrick in 1929. It is found in India (Assam). The wingspan is 12-13 mm. The forewings are shining white with a narrow fuscous or dark fuscous dorsal streak from the base to the tornus, followed by oneor two elongate marks or dashes resting on the lower part of the termen. There is a narrow dark fuscous costal streak from beyond the middle to the apex, cut by an oblique white strigula towards the apex. There is also a black apical dot. The hindwings are pale greyish subhyaline.