Cassidispa relicta

Adults are mostly white, but the antennae and legs are brown, while the disc of the pronotum is black.

The larvae mine in the leaves of Betula platyphylla and Ulmus pumila. The life cycle seems to be univoltine. The species overwinters as a mature larva until the temperature rises in the spring. Pupation takes place in fallen leaves in early April. The pupal stage lasts about one month, with adults emerging in late May. The adults feed on the mesophyllic tissue of the upper surface of the host leaves.^[3]