Species Details

Euxoa silens

University of Alberta E.H. Strickland Entomological Museum Read more about this collection »

SeasonalityThe only Alberta specimen was collected June 18, earlier than most Euxoa. IdentificationA relatively large Euxoa (3.7-4.1 cm wingspan). Forewings variable, in both a strongly contrasting pattern or a very plain one. Ground a light blue-grey, with the costa in particular usually pale and contrasting with the rest of the forewing. A black basal streak runs into a broader dark median streak below the costa, and encompassing the small oval grey orbicular and larger kidney-shaped reniform spots. Terminal area and fringe darker grey brown. Hindwing of males white shaded with dark scales along the outer margin, female sooty brown, shading darker on the outer half. In plain specimens, the forewings lack the dark streaks and contrasting dark shading except in the terminal area of the forewing. Lafontaine (1987) provides illustrations of both forms, illustrations of the genitalia and a key.

Scientific Name Euxoa silens Habitat Dry grasslands. Seasonality The only Alberta specimen was collected June 18, earlier than most Euxoa. Identification
A relatively large Euxoa (3.7-4.1 cm wingspan). Forewings variable, in both a strongly contrasting pattern or a very plain one. Ground a light blue-grey, with the costa in particular usually pale and contrasting with…
A relatively large Euxoa (3.7-4.1 cm wingspan). Forewings variable, in both a strongly contrasting pattern or a very plain one. Ground a light blue-grey, with the costa in particular usually pale and contrasting with the rest of the forewing. A black basal streak runs into a broader dark median streak below the costa, and encompassing the small oval grey orbicular and larger kidney-shaped reniform spots. Terminal area and fringe darker grey brown. Hindwing of males white shaded with dark scales along the outer margin, female sooty brown, shading darker on the outer half. In plain specimens, the forewings lack the dark streaks and contrasting dark shading except in the terminal area of the forewing. Lafontaine (1987) provides illustrations of both forms, illustrations of the genitalia and a key.
Life History Very little is known. There is a single annual brood. Adults are attracted to light. The immature stages are unknown. Conservation Apparently rare in Alberta (one record), which is at the extreme northeastern edge of the range. Diet Info Like most Euxoa species, the larvae are likely generalists on a variety of herbs. Range
Euxoa silens is a western species most abundant in the deserts of the intermountain area from southern BC south to southern California and central Arizona, west to western Colorado and southwestern Montana. The single…
Euxoa silens is a western species most abundant in the deserts of the intermountain area from southern BC south to southern California and central Arizona, west to western Colorado and southwestern Montana. The single Alberta collection is from Lethbridge.
Notes
This is yet another western moth that barely reaches Alberta in the southwest corner of the province. It must be very rare here, as only the single specimen was collected at Lethbridge, in spite of having run light…
This is yet another western moth that barely reaches Alberta in the southwest corner of the province. It must be very rare here, as only the single specimen was collected at Lethbridge, in spite of having run light traps there since the 1920's.

Citation

Page Citation for Euxoa silens

Page Citation

"Species Details - Euxoa silens, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-4246. Accessed 06 Feb. 2023.

Taxonomic Hierarchy

Kingdom Animalia Phylum Arthropoda Class Hexapoda Subclass Insecta Order Lepidoptera Suborder Ditrysia Superfamily Noctuoidea Family Noctuidae Subfamily Noctuinae Genus Euxoa Species Euxoa silens
This hierarchy is created from our museum records, it may not always accurately reflect modern taxonomies.

Taxonomic Hierarchy for University of Alberta E.H. Strickland Entomological Museum