''Microtheoris ophionalis'', the yellow-veined moth, is a

moth Moths are a paraphyletic group of insects that includes all members of the order Lepidoptera that are not butterflies, with moths making up the vast majority of the order. There are thought to be approximately 160,000 species of moth, many of w ...

in the family

Crambidae The Crambidae are the grass moth family of lepidopterans. They are variable in appearance, the nominal subfamily Crambinae (grass moths) taking up closely folded postures on grass stems where they are inconspicuous, while other subfamilies includ ...

. It was described by Francis Walker in 1859. It is found from southern

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

, through the United States and

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the southe ...

. The length of the forewings 5.5–7 mm. Adults are on wing from May to October in the northern part of the range.BugGuide
/ref>

Subspecies

*''Microtheoris ophionalis ophionalis'' *''Microtheoris ophionalis baboquivariensis'' Munroe, 1961 (Arizona) *''Microtheoris ophionalis eremica'' Munroe, 1961 (Texas) *''Microtheoris ophionalis lacustris'' Munroe, 1961 (Ontario) *''Microtheoris ophionalis occidentalis'' Munroe, 1961 (British Columbia)

References

Moths described in 1859 Odontiini {{Odontiinae-stub