The larvae of this beetle consume the leaves of elms, leaving only veins of the foliage. The adult beetles are often a nuisance when they live over-winter in buildings.
Larvae are 16mm or smaller, and are a blackish color, sometimes black and yellow, with multiple rows of dots down its back and sides. The adult beetle is approximately 6-8mm in length. It ranges from yellow to green in coloring, with a characteristic spot on its head, an hourglass mark and two spots on the front of the thorax, and a broad, dark stripe down the sides of each wing.