Helcystogramma rhabduchum is a moth in the Gelechiidae family. It was described by Meyrick in 1911. It is found in Sri Lanka and India. The wingspan is 11–12 mm. The forewings are blackish-fuscous with a pale grey supramedian streak from the base to beyond the middle, surmounted by an ochreous-yellow streak, both terminated by the upper portion of a strongly inwards-oblique elongate-oval ochreous-yellow ring. There are two oblique white streaks from the costa anteriorly running into the subcostal yellow streak, as well as an ochreous-yellow dash beneath the supramedian streak near the base. There is also an irregular oblique-transverse blotch of ground-colour margined with ochreous-yellow extending from the dorsum to the supramedian streak before the middle of the wing and the dorsal area