Lasionycta caesia is a moth of the family Noctuidae. It occurs in the Cascade Mountains of northern Washington and the British Columbia Coast Range to 58 degrees north latitude.

Lasionycta caesia
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Superfamily: Noctuoidea
Family: Noctuidae
Genus: Lasionycta
Species:
L. caesia
Binomial name
Lasionycta caesia
Crabo & Lafontaine, 2009

It occurs in rocky alpine tundra near tree line and is nocturnal.

The wingspan is 30–34 mm for males and 32–35 mm for females. Adults are on wing from mid-July to mid-August.

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