Dyspteris

Dyspteris is a genus of moths in the family Geometridae and was erected by Jacob Hübner in 1818. It is monotypic, being represented by a single species, Dyspteris abortivaria, commonly known as the bad-wing. This species was first described by Gottlieb August Wilhelm Herrich-Schäffer in 1855 and is found in North America.

It is called "bad-wing" because its forewing is much larger than its hindwing, making it often difficult to pull into position for spreading.