Figure 6. Galleries of the granulate ambrosia beetle, Xylosandrus crassiusculus (Motschulsky), in different size host tissues. Gallery patterns vary with the diameter and species of host material. In small diameter material the gallery will go in a few millimeters and then enlarge into a cavelike brood chamber with several branch galleries. In larger material, the brood galleries are more elongate and the branch galleries are longer and more numerous.
Credit: Schedl (1962)