Thiotricha pancratiastis is a moth of the Gelechiidae family. It was described by Meyrick in 1921. It is found in India (Assam) and Japan. The wingspan is about 10 mm. The forewings are white with dark fuscous markings. There is a line along the basal fourth of the costa, terminating in an irregular-edged blotch occupying the costal half of the wing to three-fourths, containing a very oblique white striga from the middle of the costa and a longitudinal white striga beneath it, and terminated by an oblique white dark-edged line from three-fourths of the costa to the middle of the termen, becoming palemetallic-blue on the discal third and broken inwards beneath it. There is a subcostal line from the base almost reaching the costal blotch, one beneath this nearly from the base and one from th