First reported occurrence of Xyleborinus alni (Coleoptera: Curculionidae: Scolytinae) in the eastern United States, with notes on its recognition and tree hosts

Xyleborinus alni (Niisima), an Asian ambrosia beetle first detected in North America in the Pacific Northwest in the late 1990s, is reported for the first time from the eastern United States. Locality data for specimens captured in Lindgren funnel traps from nine eastern states are listed and mapped; these data suggest that this immigrant xyleborine is widely established in the Northeast. A habitus illustration and a diagnosis are provided to differentiate it from the other widespread immigrant Xyleborinus species in North America, X. saxesenii (Ratzeburg).