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Western Sulphur

Prairie Farm Springs, Jefferson Co, July 1

Western Sulphur

Colias occidentalis

Size: 1.5 - 2.0 inches wingspan

Key ID features:  Males above, bright lemony yellow with unbroken black border.  Females above lighter yellow or cream, with less distinct black border. Below, central pearly "discal" spot in HW with single pinkish-brown ring, and few or no submarginal black or brown spots. HW below has black over-scaling, giving it a green cast.

Similar species:  Clouded Sulphurs have heavier submarginal spots on HW below. Queen Alexandra's Sulphurs are larger, greener below, and usually lack pink discal spot-rim below.


Host plant: Many species in the pea family.

Habitat: Meadows, roadsides, dry steppe slopes and forest glades.

Range: Mountain ranges throughout Oregon, except Coast Range.

Season: early March to early November

Abundance: Common


Conservation Status: Secure

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