Like most true bugs, this genus has membranous wings that fold flat along the back when at rest (often creating an X pattern on the back), and mouthparts joined into a strawlike structure used for piercing and sucking. Members of the stink bug family are generally oval or shield-shaped. The head is rather small. The antennae have 5 segments. The pronotum (shoulderlike section between head and wings) is generally large, and the scutellum (triangular section at the base of the folded wings, pointing away from the head) is also quite large. Coloration, patterning, and shape varies with species. Some are drab brown, gray, or tan, others leaf green, and others bright red or orange with contrasting black patterns.