Agonopterix atrodorsella is a species of moth in the family Depressariidae. It was first described by James Brackenridge Clemens in 1863.[1] It is found in North America, where it has been recorded from Illinois, Indiana, Kentucky, Maine, Maryland, Massachusetts, Michigan, New Brunswick, New Hampshire, New York, North Carolina, Ohio, Ontario, Quebec and Wisconsin.[2]
The wingspan is 18–23 mm. The forewings are yellow ochreous with several black costal dots from the base to the tip of the wing. There is a black dot on the basal portion of the disc with a rufous patch beyond this. The hindwings are yellowish.[3] Adults have been recorded in all months of the year depending on the collection locality. There is however only one generation per year.[4]
The larvae feed on Eupatorium and Coreopsis species, as well as Bidens frondosa and Myrica asplenifolia.[5] The species overwinters as an adult.