© 2018-20 by Neil Henning Björklund

Viewpoint Rd, Ochoco NF, Crook Co, June 23

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