Pelidne sulphur (Colias pelidne Boisduval & LeConte)
Wing span: 1 1/4 - 1 3/4 inches (3.2 - 4.4 cm).
Identification: Upperside of male pale yellow with wide black border and small black cell spot. Female white (most common) or yellow; dark border may be incomplete. Underside of hindwing of both sexes with dense black scales.
Life history: Males patrol near blueberry and willows for females.
Flight: One flight from late June-July.
Caterpillar hosts: Blueberry (Vaccinium species) and wintergreen (Gaultheria humifusa) in the heath family (Ericaceae).
Adult food: Flower nectar.
Habitat: Arctic tundra, subarctic forest openings and meadows.
Range: Northern Rocky Mountains from Alberta south to Wyoming.
