Large Marble
Euchloe ausonides (Lucas, 1852)
Family: Pieridae
Subfamily: Pierinae
Identification: Scattered white scales in forewing black bar. Black pattern on tip of upperside of forewing. Dense green marbling on underside of hindwing.
Wing Span: 1 1/2 - 2 inches (3.8 - 5.1 cm).
Life History: Males patrol valleys and hillsides for females. Eggs are laid singly on unopened flower buds; caterpillars eat flowers and fruits. Chrysalids hibernate.
Flight: One in the north, May-July; two in central California, February-April and May-August.
Caterpillar Hosts: Plants of the mustard (Brassicaceae) family including rockcress (Arabis drummondi), dyer's woad (Isatis tinctoria), mustards (Brassica species), and hedge mustard (Sisymbrium species).
Adult Food: Nectar from flowers of the mustard family and other plants such as fiddleneck (Amsinckia) and brodiaeas.
Habitat: Valleys, hillsides, fields, meadows, and other open sunny areas.
Range: Alaska south to central California and northern New Mexico, east to southwest Manitoba.
Conservation: The Island Marble (Euchloe ausonides insulanus) is critically imperiled. It was thought to be extinct but has been rediscovered on San Juan Island (Washington). Conservation efforts focus on restoring its ecosystem - the Puget Sound lowland prairie.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery. Subspocies insulanus is T1 (Critically Imperiled).
Management Needs: None needed.
Comments: NULL
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Verified Sightings
Displaying 1 - 24 of 550 verified sightings

Observation date: Jun 12, 2025
Submitted by: Cascade Colors
Region: Grand County, Colorado, United States
Verified by: mikefisher
Verified date: Jun 15, 2025

Observation date: Jun 08, 2025
Submitted by: topper72
Region: Colfax County, New Mexico, United States
Verified by: stevecary
Verified date: Jun 12, 2025

Observation date: May 31, 2025
Submitted by: Cascade Colors
Region: Grand County, Colorado, United States
Verified by: mikefisher
Verified date: Jun 08, 2025

Observation date: Jun 01, 2025
Submitted by: Jon Kindschy
Region: Gunnison County, Colorado, United States
Verified by: mikefisher
Verified date: Jun 08, 2025

Observation date: Jun 01, 2025
Submitted by: ezeemonee
Region: Jefferson County, Colorado, United States
Verified by: mikefisher
Verified date: Jun 08, 2025

Observation date: May 25, 2025
Submitted by: Cascade Colors
Region: Grand County, Colorado, United States
Verified by: mikefisher
Verified date: Jun 01, 2025

Observation date: Apr 23, 2025
Submitted by: kevin.burls
Region: Calaveras County, California, United States
Verified by: Ken Davenport
Verified date: May 01, 2025

Observation date: Apr 23, 2025
Submitted by: kevin.burls
Region: Calaveras County, California, United States
Verified by: Ken Davenport
Verified date: May 01, 2025

Observation date: Apr 23, 2025
Submitted by: kevin.burls
Region: Calaveras County, California, United States
Verified by: Ken Davenport
Verified date: May 01, 2025

Observation date: Apr 23, 2025
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Apr 24, 2025

Observation date: May 30, 2024
Submitted by: stevecary
Region: Taos County, New Mexico, United States
Verified by: stevecary
Verified date: Mar 09, 2025

Observation date: May 13, 2024
Submitted by: stevecary
Region: Taos County, New Mexico, United States
Verified by: stevecary
Verified date: Mar 08, 2025

Observation date: Jun 05, 2024
Submitted by: James F Parker
Region: Southeast Fairbanks, Alaska, United States
Verified by: davidwdroppers
Verified date: Oct 07, 2024

Observation date: Jun 29, 2024
Submitted by: Jon Kindschy
Region: Gunnison County, Colorado, United States
Verified by: mikefisher
Verified date: Jul 23, 2024

Observation date: Jun 20, 2024
Submitted by: Cascade Colors
Region: Grand County, Colorado, United States
Verified by: mikefisher
Verified date: Jul 22, 2024

Observation date: Jul 04, 2024
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: Jul 04, 2024

Observation date: Jun 04, 2024
Submitted by: Cascade Colors
Region: Grand County, Colorado, United States
Verified by: mikefisher
Verified date: Jul 01, 2024

Observation date: Jun 01, 2024
Submitted by: Cascade Colors
Region: Grand County, Colorado, United States
Verified by: mikefisher
Verified date: Jul 01, 2024

Observation date: Apr 15, 2024
Submitted by: icosahedron
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: Jun 19, 2024

Observation date: Jun 08, 2024
Submitted by: robertpb
Region: Tulare County, California, United States
Verified by: Ken Davenport
Verified date: Jun 16, 2024

Observation date: Apr 14, 2023
Submitted by: icosahedron
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: Jun 16, 2024

Observation date: Apr 19, 2023
Submitted by: icosahedron
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: Jun 16, 2024

Observation date: Jun 06, 2024
Submitted by: twofried
Region: Taos County, New Mexico, United States
Verified by: stevecary
Verified date: Jun 10, 2024

Observation date: Apr 01, 2024
Submitted by: TomPeterson
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: Apr 04, 2024
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