Lead-cable borer

Definition

A common name for Scobicia declivis, a small beetle in the family Bostrichidae (powderpost beetles) whose larvae bore into lead sheathing of buried telephone and electrical cables, as well as into dead hardwoods. The common name refers to this unusual habit of attacking soft metal, which the larvae can penetrate after entering through existing cracks or imperfections. Adults are dark, cylindrical, and possess a pronounced declivity (downward slope) on the posterior of the elytra, referenced in the species epithet.

Etymology

From the beetle's habit of boring into lead cable sheathing; the scientific epithet declivis refers to the sloping (declivous) posterior of the elytra.

Example

Lead-cable borer infestations in underground telephone cables were a significant maintenance problem in the early 20th century, as larvae tunneled through lead sheathing and allowed moisture to damage insulated conductors within.

Synonyms

• Scobicia declivis

Related Terms

• powderpost beetle
• Bostrichidae
• wood-boring beetle
• Scobicia
• cable pest
• lead sheathing damage

Usage Notes

The common name is somewhat misleading, as the beetle does not feed on lead itself but uses it as a protected gallery; the larvae actually consume fungal-decayed wood and can survive in seasoned hardwoods without any metal present. The name is primarily used in economic and applied entomology contexts, particularly in historical telecommunications infrastructure literature. The species is also known as the lead-cable beetle. When found in wooden structures, it is often associated with oak, ash, or other dense hardwoods.