Catocala ilia

Catocala ilia
	Caterpillar
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Hexapoda
Class:	Insecta
Order:	Lepidoptera
Family:	Erebidae
Genus:	Catocala
Species:	C. ilia
Binomial name
	Catocala ilia; (Cramer, 1776)
Synonyms
	Phalaena ilia Cramer, [1776]; Catocala duplicata Worthington, 1883; Ephesia duplicata; Catocala decorata Worthington, 1883; Catocala conspicua Worthington, 1883; Catocala uxor Guenée, 1852; Catocala albomacula Butler, 1892; Catocala iliana Strand, 1914; Catocala obsoleta Worthington, 1883; Catocala confusa Worthington, 1883; Catocala normani Bartsch, 1916; Catocala santanas Reiff, 1920; Catocala hulsti Reiff, 1920 ; Catocala zoe Behr, 1870; Catocala osculata Hulst, 1884; Catocala reiffi Cassino, 1917;

The Ilia Underwing, Beloved Underwing or Wife Underwing (Catocala ilia) is a moth of the family Erebidae. The species can be found in the Eastern part of the United States as well as southern Canada. Subspecies Catocala ilia zoe can be found in California and Arizona.

The wingspan is 65–82 mm. A spot on its forewing with a distinct white circle encompasses it distinguishes this moth from others in the same family. Otherwise, the forewing can be extremely variable. The underwing that it is named for can range in color from light orange to a deep red. The moths flies from June to September depending on the location.

The larvae feed on Oak, including black, burr, red, and white oaks.