Lecontia discicollis

Distinguished from superficially similar beetles by its combination of jet black, non-metallic coloration; convex, bullet-like body shape; slow, deliberate movement; and bead-like (moniliform) antennae with bases concealed by a ridge. Unlike bark-gnawing beetles (Trogossitidae), it lacks iridescence and agility. Unlike darkling beetles (Tenebrionidae), it has a notably narrow body and exposed jaws. The single North American congener, Boros unicolor, is more elongate and occurs in different microhabitats.

Fire-killed conifer forests, specifically standing trees killed by fire or bark beetles. Adults and larvae occupy moist, white-rotted wood in the root system and lower trunk, typically 3–5 years after tree death. Associated with ponderosa pine in the Black Hills and southwestern U.S., and found at elevations ranging from approximately 7000–8300 ft in montane forests.

North America: documented from the Black Hills of South Dakota, Colorado (Front Range), and the southwestern U.S. including northern Arizona (Coconino County, Kaibab National Forest) and southern Utah. Central American records also reported. In Canada, recorded from Alberta.

Adults have been observed in April and June, suggesting spring to early summer activity. Nocturnal behavior observed on tree trunks.

• Pinus ponderosa - breeding substratefire-killed trees, moist decayed root system and lower trunk

Larvae develop in moist, white-rotted wood near and below ground level in standing fire-killed conifers. Developmental timing poorly documented, but association with trees 3–5 years post-fire suggests a multi-year life cycle.

Slow-moving and deliberate in locomotion. Nocturnally active on trunks of fire-killed or stressed conifers. Adults have been observed searching tree trunks at night, sometimes in association with other nocturnal beetles.

Decomposer in fire-killed conifer ecosystems; contributes to wood decay processes in standing dead trees. Specialized occupant of a narrow, extreme niche that few other beetles exploit.

Of interest to coleopterists due to rarity of encounter and specialized habitat requirements. Not a forest pest; poses no economic threat to timber or living trees.

• Boros unicolorOnly other North American borid genus; more elongate body form, different microhabitat preferences
• TrogossitidaeBark-gnawing beetles share association with dead wood but are agile, often metallic or iridescent, with different antennal structure
• TenebrionidaeSome darkling beetles have bead-like antennae but lack the convex, bullet-shaped body and exposed jaws; generally broader-bodied

• Boridae
• conifer bark beetle
• fire ecology
• nocturnal
• ponderosa pine
• post-fire succession
• specialist
• rarely encountered

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Bug Eric: Borids Are Not Bor-ing
• Chrysididae | Beetles In The Bush