elm' bark" bee"tle
1. Also called smaller European elm bark beetle. a shiny, dark reddish-brown bark beetle, Scolytus multistriatus, originating in Europe and now widespread in the U.S.: the primary vector of Dutch elm disease.
2. Also called native elm bark beetle. a bark beetle, Hylurgopinus opaculus, of eastern North America, that also transmits Dutch elm disease.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.