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A medium-size moth (3.8-4.5 cm wingspan) with pink-brown wings. The forewings are crossed by a prominent silver-white band that runs from the base just below the costa about 1/3 of the way to the tip, then turns sharply downward to the outer end of the lower margin, and then angles sharply upward to the tip. There are two large irregular silver-white spots on the outer half of the costa, and another on the lower margin near the base. A series or 3 or 4 small white spots are located along the outer margin. The hindwings are pink-brown, suffused with grey over much of the median area. The antennae are reduced and hair-like. The similar G. noviganna is smaller and has a simpler pattern, confined to the white band but without the large accessory spots. G. roseicaput is found only in the mountains, is darker and has the band broken up into series of spots.

Northern boreal, from New England and Quebec west to the Foothills of Alberta. In Alberta they have been collected from the southern edge of the Boreal forest (Edmonton, Gainford, Edson) north to near Lake Athabasca and south along the lower edge of the Foothills. Its presence in the mountains (Bowman, 1951) needs confirming.