Observation notes: At about 1900 feet elevation on open spruce forest with an understory of fairly tall (3-4 ft), thick dwarf birch. Flowering dogwood (Cornus Canadensis), blueberry, and Labrador tea also in abundance. Partly sunny and about 65 F with thunder clouds moving through - the vegetation was at that stage after a rain where most everything was dry except the blueberries which hold water drops for a long time. The moth would not let me get closer than about 6 feet. The white triangles were prominent as it flew and when it landed.