Elasmostethus tristriatus (also called Juniper Shieldbug) is a species of bugs in Shield bug family. The species are green coloured with pinkish-red corium. They are 9–10.5 millimetres (0.35–0.41 in) in length and are active during warm months. They mate during spring. The larvae feed on berries, while adults feed on juniper. They also feed on Lawson's cypress.