Quesada gigas, commonly known as the Giant Mesquite Bug, is a large insect found in the southwestern United States and Mexico. It belongs to the family Coreidae and can grow up to 2 inches in length. The bug has a distinct black and red coloration, with a flattened body and long antennae. It feeds primarily on the seeds of mesquite trees and is known for its loud buzzing sound when disturbed.