Black Bess Beetle - Mastachilus sp.

Study insects and spiders in backyard, Brisbane, Queensland, Australia. Discussion of insects and spiders evolution.

Bess Beetle - Odontotaenius disjunctus

Horned Passalus (Bess) Beetle – Field Station

Black Bess Beetle - Mastachilus sp.

The Blug: Bess Beetles - Scienceline

Beetle (Coleoptera) species - Canberra & Southern Tablelands

Ecology and Conservation of Passalidae

Beetle (Coleoptera) species - Canberra & Southern Tablelands

Bess beetle, Wood-boring, Burrowing, Nocturnal

Bess Beetles of Kentucky - University of Kentucky Entomology

Horned Passalus Missouri Department of Conservation

Horned Passalus (Bess) Beetle – Field Station

B Beetle or Horned Passalus NC State Extension Publications

Bess Beetle - The Australian Museum

Other beetle species - Canberra & Southern Tablelands