Stenodema laevigatum, or sometimes Stenodema laevigata (also called Grass bug), is a carnivorous species of bug from Miridae family. The species have a gray to brown elongated body, with the eyes located backwards in the head. Sometimes they might come in green colour. They are 8–10 millimetres (0.31–0.39 in) in length, which makes it a rather big species of its kind. They are common in the United Kingdom, and throughout the rest of Europe.
The larvae is light yellowish and is born in summer, with adults taking over by August. Adults and larvae are both feeding on unripe grains, which includes: Alopecurus, Dactylis, Festuca and wheat. Sometimes, larvae might suck juices from leaves and stems. They start to eat grass seeds and flowers by later development. The larvae hibernates in winter, by living in a soil, and leaf litter. Both males and females mate in spring, with the males being greener than females. The larvae is active from May–July, after which the new generation appears, which will last till next spring.