Collared Arches are on the wing during late summer and fall, typically from mid-July to early September. You may spot one sipping nectar at the blossoms of Rubber Rabbitbrush in the early evening or near your outdoor lights. Larvae are climbing cutworms that feed on various herbaceous plants in families like aster (Asteraceae) and pea (Fabaceae). This species is common and widespread across the west, from Southern Alberta and western Montana to Texas and New Mexico, and recorded from locations in California and the Intermountain Region.
Photo by: Glenn Marangelo on 8/8/21 in Missoula, MT