Thiotricha janitrix is a moth of the Gelechiidae family. It was described by Meyrick in 1912. It is found in India (Bengal). The wingspan is about 8 mm. The forewings are shining ashy-grey with elongate whitish marks along the dorsum before and beyond the middle, and a third on the tornus forming a very oblique wedge. There is an indistinct streak of whitish suffusion in the disc from beyond the middle to near the apex, where it meets a white oblique strigula from the costa, and a longer very oblique white striga from the apex of the tornal wedge-shaped mark. There is also a lunulate white mark before the apex, cutting off a small apical spot which is edged above and beneath with blackish. The apical area of the wing between and round these pale markings dark fuscous. The hindwings are gre