Crambidia lithosioides, the Dark Gray Lichen Moth, is a moth of the Arctiidae family. It was described by Dyar in 1898. It is found from North Carolina to Florida and from Kentucky to Mississippi. The wingspan is 12–18 mm. Female have dark brownish-grey forewings with paler veins and pale yellow strip along the costa. Males have pale greyish-brown forewings with paler veins. They lack the pale costal strip. Adults are on wing from May to October. The larvae feed on lichens.