The ladder-backed ethmia moth (Ethmia delliella) is a moth in the Depressariidae family. It is found from the Gulf region of Texas and Mexico to the west coastal plain of Mexico, Chiapas, El Salvador and Costa Rica. The length of the forewings is 9–12 mm. The ground color of the forewings is white with black markings, reflecting metallic steel blue. The ground color of the hindwings is white, becoming slightly to strongly brown toward the apex. Adults are on wing from March to October in Texas and from April to August elsewhere. There are probably multiple generations per year.