A North American longhorn beetle, Megacyllene robiniae, the larvae of which bore into the wood of the black locust (Robinia pseudoacacia), and the adults of which feed on goldenrod pollen.
Origin
Early 19th century.
Definition of locust borer in US English:
locust borer
noun
A North American longhorn beetle, Megacyllene robiniae, the larvae of which bore into the wood of the black locust (Robinia pseudoacacia), and the adults of which feed on goldenrod pollen.