Source : Webster's Revised Unabridged Dictionary (1913)

Longicornia \Lon`gi*cor"ni*a\, n. pl. [NL., fr. L. longus long +
   cornu horn.] (Zo["o]l.)
   A division of beetles, including a large number of species,
   in which the antenn[ae] 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}.