Identification
Adult: forewing purplish-black with two incomplete thin white bands about one-third and two-thirds distance from base; may also have white spots at apex; head black with bushy tuft of erect hairs; antennae of male at least twice as long as wing
hindwing uniformly dark with wide fringe
Per comment
here "The Moths of Western North America by Powell and Opler, p 40, states that the orange scales on the head indicate a female in this species."
Range
British Columbia to California
Season
adults fly in April and May
Internet References
live adult image and other info (Jeremy Tatum, Butterflies and Moths of Southern Vancouver Island)
live adult images (Adam Winer, California)
presence in California; list (U. of California at Berkeley)