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The illustration shows the "tracks" or galleries created by these insects just beneath the bark of a tree. These patterns are highly characteristic of different bark beetle species and are often used by entomologists and foresters for identification.Key Features of the GalleryThe Maternal Tunnel: The central, longer vertical or slightly curved groove is the "mother gallery." The female beetle bores this tunnel to lay her eggs along the sides.The Larval Tunnels: The smaller, radiating horizontal grooves are created by the larvae. As they hatch, they eat their way outward from the main tunnel, growing larger as they move, which is why the tracks widen toward the ends.Exit/Entry Holes: The small circular dots at the top of the illustration represent the holes where adult beetles have either entered to breed or exited after maturing.