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Lyctidae (powder-post beetles; subclass Pterygota, order Coleoptera) Family of small, elongate, parallel-sided beetles, distinguished from other woodborers by having a smaller pronotum, which leaves the head visible. The antennae have two-jointed clubs. Larvae are white, fleshy, and C-shaped, with the head largely covered by the prothorax. They attack the heartwood of deciduous trees, but never conifers, reducing wood to a powdery dust. There are 70 species.