Loxostege offumalis is a moth in the Crambidae family. It was described by Hulst in 1886. It is found in North America, where it has been recorded from California. The wingspan is 19-22 mm. The forewings are fuscous, shaded with black. There is a black basal dash, as well as a black reniform and orbicular spot. The hindwings are dark fuscous with a central row of black spots and a fuscous marginal band. Adults have been recorded on wing from February to March.