At up to 1.5 inches in length, these beetles are hard to miss when they are around. They can be found across the western half of North America. When disturbed, they make a hissing sound by rubbing their abdomen against the inside of their wing covers. Males have large, feathery antennae and are strongly attracted to lights. Females have substantially smaller antennae and rarely visit lights. Adults of both sexes feed on foliage of various trees and shrubs, while the larvae feed on the roots.
Photo by Jacque Currie on 8/23/20 in Missoula, MT.