Lyctus planicollis is a species of wood-boring beetle belonging to the family Bostrichidae. Commonly known as the flat-headed wood-borer, it primarily infests hardwoods, particularly those that are already weakened or decayed. The adult beetles are typically small, measuring about 4 to 6 millimeters in length, and have a distinctive flattened head. The larvae of Lyctus planicollis are responsible for the damage, as they tunnel through the wood, creating galleries that can weaken structural integrity. This species is often found in furniture, flooring, and other wooden products, making it a concern for both homeowners and the woodworking industry.