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. Squash bugs suck sap from plants in the squash family. Adults of our most common species (Anasa tristis) are shiny, brownish, speckled in the front parts of the body, and rather oval. The head is narrow. Nymphs go through several stages, the youngest light green and aphid- or spiderlike, the older ones grayish, all with dark legs. When disturbed, squash bugs can emit a foul odor.