Whitespotted sawyer, Monochamus scutellatus, adult longhorned beetle, or roundheaded wood borer.

Top view close-up on bark of an adult beetle, mostly black with white bloches.; Ramsey County, Minnesota Credit: Steven Katovich, USDA Forest Service, Bugwood.org
Whitespotted sawyer, Monochamus scutellatus, adult longhorned beetle, or roundheaded wood borer. Credit: Steven Katovich, USDA Forest Service, Bugwood.org