Key to the L. skraelingia species-group

1. Antemedial line nearly straight, undulating; forewing color even gray; Eurasia and far northwestern North America (Yukon)................... L. skraelingia

– Antemedial line uneven, zigzag; forewing ground color mottled with mixture of black, gray, and white scales; widely distributed in boreal North America ..................................................................................................... L. taigata