Epiphthora thyellias is a moth of the family Gelechiidae. It was described by Edward Meyrick in 1904. It is found in Australia, where it has been recorded from Victoria.[1]
The wingspan is about . The forewings are white, suffused with whitish ochreous except towards the apex, irregularly sprinkled with dark fuscous. There is a broad longitudinal streak of dark fuscous irroration (sprinkles) from before the middle of the disc to the apex. The hindwings are ochreous whitish.[2]