Hodges # 6755
Caterpillar foods: conifers, and also broad-leaved trees and shrubs (alder, birch, buffaloberry [Shepherdia], meadowsweet [Spirea], poplar, willow (Bugguide)
Pero honestaria, Pero ancetaria, and Pero morrisonia are difficult to differentiate in photos – they need to be dissected to be sure of the correct ID. (Bugguide lists some ways to visually distinguish these species.) These are my best guesses without dissection.