Long, thin antennae that are often as long (or longer) than the body of the beetle; 5/8- to 1-inch in length. The beetle's body has a slightly flattened appearance, and its color may appear dark gray, but is usually brownish black to black.
It is not often that a homeowner or pest control operator actually finds adult old house borers in a structure; the sound of the larvae feeding, exit holes and frass are the signs that usually point to an infestation.
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