Northern Marble (Euchloe creusa [Doubleday])
Wing span: 1 3/8 - 1 5/8 inches (3.5 - 4.2 cm).
Identification: Pale markings at tip of upperside of front wing; cell bar narrow. Fore- and hindwing bases dark on the uppersides.
Underside of hindwing with considerable "fractured" dark marbling.
Life history: Females lay single eggs on host plant flower buds; caterpillars eat flowers and fruits. Chrysalids hibernate.
Flight: One flight from May-July.
Caterpillar hosts: Plants of the mustard (Brassicaceae) family.
Adult food: Flower nectar. Specific plants not reported.
Habitat: Mountains, rocky outcrops, trails, roadsides.
Range: Alaska south and east to British Columbia, Alberta, and Saskatchewan. Northern Montana in Glacier National Park.
Conservation: Widespread in Alaska, south into British Columbia, Alberta, and Saskatchewan into northern Montana.
