Thiotricha hemiphaea 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 10 mm. The forewings are grey, towards the base suffused with silvery white except for a long dorsal wedge, broadest at the base. There is a white costal dot at five-sixths and black dots on the apex and mid-termen, edged anteriorly with white. The hindwings are grey with an apical fuscous dot.[2]