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 24 Jun. 2024.

References

Specimen Information

There are 42 specimens of this Species.

41 results plotted on map in 18 markers.
Note: Only records with latitude and longitude coordinates are plotted on map.

UASM57894 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: British Columbia, Okanagan Falls Collected ByTroubridge, J. Date Collected1990-06-10/1990-06-16

UASM57895 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Kittitas county, Schnebly Coulee Collected ByTroubridge, J.; Crabo, L. Date Collected1994-06-02

UASM112947 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Kittitas county, Schnebly Coulee Collected ByTroubridge, J.; Crabo, L. Date Collected1994-06-02

UASM112948 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: British Columbia, Lillooet Collected ByTroubridge, J. Date Collected2000-07-07

UASM112949 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: British Columbia, Lillooet Collected ByTroubridge, J. Date Collected2000-07-07

UASM112950 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: British Columbia, Lillooet Collected ByTroubridge, J. Date Collected1997-07-04

UASM112951 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: British Columbia, Lillooet Collected ByTroubridge, J. Date Collected1998-07-02

UASM112952 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: British Columbia, Lillooet Collected ByTroubridge, J. Date Collected1998-07-02

UASM112953 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: British Columbia, Lillooet Collected ByTroubridge, J. Date Collected1998-07-02

UASM112954 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Douglas county, Bridgeport Collected ByTroubridge, J. Date Collected1996-06-15

UASM112955 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Douglas county, Jameson Lake Collected ByTroubridge, J. Date Collected1996-06-09

UASM112956 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: California, Plumas county, Squirrel Creek Collected ByTroubridge, J. Date Collected1999-06-14

UASM112957 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Kittitas county, Vantage Collected ByTroubridge, J. Date Collected1994-05-22

UASM112958 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Kittitas county, Vantage Collected ByTroubridge, J. Date Collected1998-05-16

UASM112959 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Kittitas county, Vantage Collected ByTroubridge, J. Date Collected1998-05-16

UASM112960 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Kittitas county, Vantage Collected ByTroubridge, J. Date Collected1994-05-22

UASM112961 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Kittitas county, Vantage Collected ByTroubridge, J. Date Collected1998-05-16

UASM112962 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Kittitas county, Vantage Collected ByTroubridge, J. Date Collected1998-05-16

UASM112963 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Kittitas county, Vantage Collected ByTroubridge, J. Date Collected1998-05-16

UASM112964 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedUnited States: Washington, Kittitas county, Vantage Collected ByTroubridge, J. Date Collected1998-05-16

UASM112965 - Euxoa silens

University of Alberta E.H. Strickland Entomological Museum

Place CollectedCanada: British Columbia, Vaseux Lake Collected ByTroubridge, J. Date Collected2000-06-01

Adult Seasonal Distribution