Red underwing
![](/Images/godic/202502/06/Catocala.nupta-moth7-30.07.061603.jpg")
![](/Images/godic/202502/06/Catocala.nupta-Moth3-30.07.061603.jpg")
![Mounted](/Images/godic/202502/06/Catocala_nupta1604.jpg")
![Illustration from John Curtis's British Entomology Volume 5](/Images/godic/202502/06/Britishentomologyvolume5Plate2171604.jpg")
The red underwing (Catocala nupta) is a moth of the Erebidae family.
This is a large (80 mm wingspan) nocturnal European species which, like most noctuids, is drably coloured to aid concealment during the day. It flies in August and September, and comes freely to both light and sugar.