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Close-up photo of adult Pink-edged Sulphur butterfly

Ditch Cr Rd, Morrow Co, July 9


Colias interior

Size: 1.5 - 2.0 inches wingspan

Key ID features:  Male above, solid black wing borders. Female above, smudgy FW border, can be either pale yellow or white.  Below, HW yellow, with little or no black scaling, and discal spot single-rimmed with no satellite. Usually with bright pink wing fringes. Flight pattern is more relaxed than other sulphurs. Perhaps the most important clue for ID is the pattern of over-scaling on the ventral hindwing:  more dense toward the thorax and lighter toward the wing margin.

Similar species:  Other similar sulphur species in Oregon lack the gradient of the density of overscaling on the dorsal hindwing (see above). Clouded Sulphurs have double ring around discal spot on HW below. Western Sulphurs greenish on HW below. Queen Alexandra's Sulphurs are larger, have more pointed wings, heavier black overscaling below and lighter pink wing borders.


Host plant: Various species of Vaccinium (huckleberry).

Habitat: Mid-elevation forest clearings, meadows marshes and heathlands.

Range: Central OR Cascades and Blue Mountains.

Season: Early June to mid-September

Abundance: Uncommon


Conservation Status: Secure

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