Dicymolomia opuntialis is a moth in the family Crambidae.[1] It is found in North America, where it has been recorded from California.[2]
The wingspan is about 13 mm. The forewings are silvery grey with a fulvous-orange base. There is a wavy black line with an orange blotch at the costa. The hindwings are silvery grey with five black marginal spots, separated by metallic scales and shaded with dull orange.[3] Adults are on wing from May to September.
The larvae feed on Opuntia species, mining in the joints of the cactus pads.[4]