Autosticha petrotoma is a moth in the Autostichidae family. It was described by Meyrick in 1916. It is found in Sri Lanka. The wingspan is about 18 mm. The forewings are grey-whitish speckled with black and with a black dot on the base of the costa, and a subcostal one close beyond it. There are small black spots on the costa at one-fifth and before and beyond the middle. The stigmata are black, the plical and first discal small, the plical rather obliquely posterior, the second discal larger, confluent with a blackish spot lying above and beyond it. There are three black dots on the costa posteriorly, from the first of which a curved series of black dots runs to the tornus, closely adjacent to the termen on the lower half. There are also some undefined small black dots on the termen. The