Beetles in Washington

Washington has numerous beetles belonging to several families like scarab, and longhorn beetles, distributed in the eastern and western parts. Eastern Washington houses species like the mountain pine beetle, a significant threat to the forests, alongcol3 Northern Carrion beetle, American oil beetle, etc.

 The ten-lined June beetle measuring up to 28 mm found between June and July mainly occurs in the southeastern parts of the state. The big-sized Japanese beetle is not a native here but can be found in some parts infesting plants. Another annoying pest here is the blister beetles found in alfalfa plants, which are harmful to horses.

Beetles in Washington (WA)

Largest Beetles: Ten-lined June Beetle, Japanese Beetle, California Prionus Beetle

Smallest Beetles: Varied Carpet Beetle, Little Bear Beetle

Most Common Beetles: Ten-lined June Beetle,Red Milkweed Beetle, Margined Blister Beetle

Carrion Beetles

  • Northern Carrion Beetle (Thanatophilus lapponicus)

Scarab Beetles

  • Ant Scarab Beetle (Cremastocheilus crinitus)
  • Long-haired June Beetle (Polyphylla crinita)
  • Little Bear Beetle (Paracotalpa granicollis)
  • Ten-lined June Beetle (Polyphylla decemlineata)
  • Japanese Beetle (Popillia japonica)

Longhorn Beetles

  • Whitespotted Pine Sawyer Beetle (Monochamus scutellatus)
  • California Prionus Beetle (Prionus californicus)
  • Ponderous Borer Beetle (Trichocnemis spiculatus)
  • Red Milkweed Beetle (Tetraopes tetrophthalmus)
  • Red-headed Ash Borer Beetle (Neoclytus acuminatus)

Jewel Beetles

Click Beetles

  • Western Eyed Click Beetle (Alaus melanops)

Ground Beetles

  • Oblique-lined Tiger Beetle (Cicindela tranquebarica)

Ladybird Beetles

True Weevils

Blister Beetles

  • Margined Blister Beetle (Epicauta funebris)
  • American Oil Beetle (Meloe americanus)

Longhorn Beetles

  • Citrus Long-horned Beetle (Anoplophora chinensis)
  • Asian Long-horned Beetle (Anoplophora glabripennis)
  • Red-necked Longhorn Beetle (Aromia bungii)

Skin Beetles

  • Varied Carpet Beetle (Anthrenus verbasci)

Ptinidae Beetles

  • Anobiid Powderpost Beetle (Euvrilletta peltata)