How does the frass texture left by the Old House Borer compare to that left by powderpost beetles?

Answer

OHB frass is coarse, while powderpost beetle frass is fine and flour-like

The Old House Borer larvae leave behind coarse, wood-like material, whereas powderpost beetles leave behind a much finer, flour-like dust.

How does the frass texture left by the Old House Borer compare to that left by powderpost beetles?
insectwoodpestborerhouse borer