Appearance: Forewing above shows prominent notched black cell end bar and a black checkered pattern along trailing edge. The hindwing above is white with black veining. Below hindwing shows heavy green-brown veining with a mid-wing whitish interruption of the veining.
Size: Small; less than 1 1/2 inches
Habitat: Found flying along stream side in conifers and wet meadows in the montane
Season: May to mid-June in the montane
Larval Foodplant: Mustard family
Did You Know…
The name refers to its early flight, weeks before other butterflies (except for Cabbage Whites) emerge. Some feel the black scales might assist in absorbing warmth on cool spring days (Angel, 2005).
Species Gallery (click to enlarge)