Final answer:
Lyctid powderpost beetles are known as true powderpost beetles because they produce fine powdery frass.
Step-by-step explanation:
Lyctid powderpost beetles, also known as true powderpost beetles, are characterized by the fine powdery frass they produce. This substance is what is left over after the beetle larvae have digested the starch-rich parts of the wood they infest. Consequently, the correct answer is A. True, fine powdery frass.
Lyctid beetles are known as powderpost beetles (PPB) because they produce true, fine powdery frass. Frass is the sawdust-like material that beetles produce as they tunnel through wood. The powderpost beetles create small holes and leave behind a powdery frass, which is one of the signs used to identify their presence.