© 2018-19 by Neil Henning Björklund

Big Summit Prairie, Crook Co, June 24

Large Marble

Euchloe ausonides

Size: Up to 1.75 inches wingspan

Key ID features:  Above, milk-white with black pattern on FW tip and thin black rectangle ("cell bar") in forewing cell with light white scaling. Below, bold gray-green marbling against white background and yellow veins.

Similar species:  California Marble and Desert Marble are smaller. Desert Marble has pearly or shiny look to white areas. California Marble lacks white scaling on forewing cell bar.

 

Host plant: Many cruciferous species.

Habitat: Open montane and foothill slopes, dry meadows and canyons, sage steppe habitats.

Range: All of eastern Oregon and southwestern Oregon south of Douglas County.

Season: Late March to late July

Abundance: Common

 

Conservation Status: Secure