Loxostege anartalis is a moth in the Crambidae family. It was described by Grote in 1878. It is found in North America, where it has been recorded from coast to coast in Canada. In the west, the range extends south to California. The wingspan is 20-24 mm. The ground colour of the forewings is bluish grey, with a whitish postmedial line and a dark discal spot. The hindwings have a bluish grey ground colour and a whitish postmedial line, as well as a whitish medial area. Adults have been recorded on wing from April to July.