The elytra is wider than the pronotum . Roundhead borer larvae are large and robust with the head and body generally the same width. However, several are important pests of living healthy trees and shrubs. The boring of the larval form into the cambium and sapwood of woody plants can cause great harm and injury and even kill. They are usually 25 - 35 mm in length, brown or blackish to a yellow and black.
Some species have dark wings.
The abdomen is broadly joined to the thorax and the tip possess a spear or spine giving it the name horntail. Front tibiae have one spur at the tip. The larvae feed primarily on softwood. Seasoned structural lumber infested with the larva are placed in the home. When mature the adults emerge from their chambers in the wood.