Thiotricha argyrea is a moth of the family Gelechiidae. It was described by Alfred Jefferis Turner in 1919. It is found in Australia, where it has been recorded from Queensland.[1]
The wingspan is about 12 mm. The forewings are shining-white with three suffused grey dorsal blotches, sub-basal, median and tornal. There is a short oblique grey streak from five-sixths of the costa, succeeded by a narrow parallel blackish streak. There is also a blackish apical dot. The hindwings are grey.[2]