Wikipedia
Erebinae
The Erebinae are a subfamily of moths in the Erebidae family. Many of the species in the subfamily are large (7 to 10 cm, 3 to 4 inches) compared with other noctuoid moths in temperate zones. Some of these large moths, such as those in Catocala and related genera, have brightly colored hindwings used as distraction displays, while others, such as those in Zale and related genera, have mottled, drably colored hindwings helpful as camouflage in grass and on tree trunks.