
Appearance
Adult: forewing variably light gray to light brownish-yellow with 3 dark spots in subterminal area -- two together near costa and one about mid-way across wing; PM line gently wavy, and AM line straight, both lines dark with pale edge along medial side, and both lines stop before reaching costa; discal spot consists of a short oblique dash; usually some darker shading beyond PM line; hindwing paler than forewing, lightly speckled, with faint discal spot and indistinct whitish PM lineDistribution
California to British ColumbiaFood
larvae feed on leaves of alder, birch, willow, Grand Fir, and Douglas-firReferences:
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http://bugguide.net/node/view/170621