Helcystogramma xerastis is a moth in the Gelechiidae family. It was described by Meyrick in 1905. It is found in Pakistan. The wingspan is 15–16 mm. The forewings are brownish-ochreous, ferruginous-tinged sometimes suffused with rather dark fuscous on the dorsal half anteriorly and on the veins posteriorly. The stigmata is ferruginous-ochreous with some dark fuscous scales, partially edged with whitish, the plical elongate, dash-like, rather before the first discal. There is a terminal series of fuscous or dark fuscous dots. The hindwings are pellucid, grey-whitish, posteriorly and on the veins suffused with greyish-ochreous.