longicornia

from The Century Dictionary.

• A group of tetramerous Coleoptera, having long filiform antennæ, sometimes several times longer than the body; the longicorns or longicorn beetles.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) A division of beetles, including a large number of species, in which the antennæ are very long. Most of them, while in the larval state, bore into the wood or beneath the bark of trees, and some species are very destructive to fruit and shade trees. See Apple borer, under apple, and Locust beetle, under locust.