''Stephensia cunilae'' 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 ...

of the family

Elachistidae The Elachistidae (grass-miner moths) are a family of small moths in the superfamily Gelechioidea. Some authors lump about 3,300 species in eight subfamilies here, but this arrangement almost certainly results in a massively paraphyletic and co ...

. It is found in the United States, where it has been recorded from

Ohio Ohio () is a state in the Midwestern region of the United States. Of the fifty U.S. states, it is the 34th-largest by area, and with a population of nearly 11.8 million, is the seventh-most populous and tenth-most densely populated. The sta ...

Kentucky Kentucky ( , ), officially the Commonwealth of Kentucky, is a state in the Southeastern region of the United States and one of the states of the Upper South. It borders Illinois, Indiana, and Ohio to the north; West Virginia and Virginia to ...

and

Indiana Indiana () is a U.S. state in the Midwestern United States. It is the 38th-largest by area and the 17th-most populous of the 50 States. Its capital and largest city is Indianapolis. Indiana was admitted to the United States as the 19th s ...

. The

wingspan The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the other wingtip. For example, the Boeing 777–200 has a wingspan of , and a wandering albatross (''Diomedea exulans'') caught in 1965 had a wingspan of ...

is 6.5–7 mm. The extreme base of the forewings is dark reddish-bronze, while the rest of the wing is dark brown with a bronzy luster. The markings are pale golden. The hindwings are dark grayish brown. Adults are on wing in late June and July and again in September in two generations per year. The larvae feed on ''

Cunila origanoides ''Cunila origanoides'', with the common names stone mint, frost mint, dittany, and American dittany, is a perennial late-summer-flowering subshrub with small purple flowers that is native to the central and eastern United States. It belongs to ...

''. They

mine Mine, mines, miners or mining may refer to: Extraction or digging * Miner, a person engaged in mining or digging *Mining, extraction of mineral resources from the ground through a mine Grammar *Mine, a first-person English possessive pronoun ...

the leaves of their host plant. The mine starts as a narrow gallery, extending towards the tip of the leaf. It later expands into a blotch occupying the outer half of the leaf. All

frass Frass refers loosely to the more or less solid excreta of insects, and to certain other related matter. Definition and etymology ''Frass'' is an informal term and accordingly it is variously used and variously defined. It is derived from the ...

is deposited within the mine. The larvae have whitish body with a slight green tinge. The head is black. Pupation takes place outside of the mine in a fold of a leaf beneath a fine, closely woven sheet of silk. Adults of the second generation overwinter.Memoirs of the American Entomological Society
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References

Elachistidae Moths described in 1930 Moths of North America {{Elachistidae-stub