Dorsal (top) and lateral (bottom) views of a female Xylossandrus crassiusculus (Motschulsky), commonly called the "Asian ambrosia beetle."

Female X. crassiusculus are 2.1-2.9 mm long, stout bodied; the mature color is dark reddish brown, darker on the elytral declivity. X. crassiusculus is distinguished from the other two Xylosandrus species in the southeastern United States by its larger size (females of other species are only 1.3-2.0 mm long), and the dull, densely granulate surface of the declivity (smooth and shining in other species).