Microtheoris ophionalis

Microtheoris ophionalis, the yellow-veined moth, is a moth in the Crambidae family. It was described by Walker in 1859. It is found from southern Canada, through the United States and Mexico to South America.

The length of the forewings 5.5–7 mm. The wing colour varies from dark ochreous brown, rust brown with a well-defined subterminal line, to pale tan with brown subterminal lines. Adults are on wing from May to October in the northern part of the range.