Ctenucha rubroscapus

Ctenucha rubroscapus, the red-shouldered ctenucha moth, is a moth of the family Erebidae. It was described by Édouard Ménétries in 1857.^[1] It is found in western North America,^[2] limited to low elevations west of the Cascade Mountains, south of Chehalis in Washington.

Red-shouldered ctenucha moth
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Superfamily:	Noctuoidea
Family:	Erebidae
Subfamily:	Arctiinae
Genus:	Ctenucha
Species:	C. rubroscapus
Binomial name
Ctenucha rubroscapus (Ménétriés, 1857)
Synonyms
Claucopis rubroscapus Ménétriés, 1857 Ctenucha ochroscapus Grote & Robinson, 1868 Ctenucha corvina Boisduval, 1869 Ctenucha walsinghamii H. Edwards, 1873

The length of the forewings is 19–20 mm.

The larvae feed on Poaceae and Cyperaceae species, including species of the genera Dactylis and Elymus.^[3]