Stomopteryx sphenodoxa is a moth of the Gelechiidae family. It was described by Meyrick in 1931. It is found in India. The wingspan is about 9 mm. The forewings are dark bluish-fuscous with a triangular whitish-ochreous spot on the costa beyond the middle. The hindwings are dark grey. The larvae feed on Crotalaria species. They mine the leaves of their host plant.