leaf beetle

from The Century Dictionary.

• noun Particular leaf-beetles (and so with leaf-cutters, root-borers, etc.) are known by some distinctive adjective or attribute prefixed, as bean leaf-beetle (‘leaf-beetle of the bean’). All such three-word names may be taken also as bean-leaf beetle (‘beetle of the bean-leaf’), etc.
• noun A beetle of the family Chrysomelidæ, nearly all the members of which are leaf-feeders both as larvæ and as adults.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of very many brightly-coloured beetles, of the family Chrysomelidae, that feed on plant leaves.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun brightly colored beetle that feeds on plant leaves; larvae infest roots and stems