Photo by Melody

Pine Sawyer Beetle (Ergates spiculatus)

Order: Coleoptera (ko-lee-OP-ter-a) (Info)
Family: Cerambycidae
Genus: Ergates
Species: spiculatus


No positives
1 neutral
No negatives


This bug has been reportedly found in the following regions:

Florence, Arizona
Hereford, Arizona
Surprise, Arizona
Cathedral City, California
East Shore, California
Gualala, California
Knights Landing, California
Lincoln, California
Oakland, California
Orinda, California
San Simeon, California
Santa Cruz, California
Monroe, Connecticut
Oakdale, Connecticut
Mount Airy, Maryland
Sanbornton, New Hampshire
Flemington, New Jersey
Bend, Oregon
Eugene, Oregon
Gold Hill, Oregon
Newberg, Oregon
Barnet, Vermont
Hoquiam, Washington
Naches, Washington
Nine Mile Falls, Washington

By Scorpioangel
Thumbnail #1 of Pine Sawyer Beetle (Ergates spiculatus) by Scorpioangel

By jminafra

Thumbnail #2 of Pine Sawyer Beetle (Ergates spiculatus) by jminafra

By jbekebrede

Thumbnail #3 of Pine Sawyer Beetle (Ergates spiculatus) by jbekebrede

By mommy_lonewolf

Thumbnail #4 of Pine Sawyer Beetle (Ergates spiculatus) by mommy_lonewolf

By KayBay

Thumbnail #5 of Pine Sawyer Beetle (Ergates spiculatus) by KayBay

By KayBay

Thumbnail #6 of Pine Sawyer Beetle (Ergates spiculatus) by KayBay

By masonfamilyaz

Thumbnail #7 of Pine Sawyer Beetle (Ergates spiculatus) by masonfamilyaz

There are a total of 27 photos.
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Member Notes:

Neutral Scorpioangel On Aug 13, 2006, Scorpioangel from Gold Hill, OR
(Zone 7a) wrote:

Description: This is the largest beetle in western North America. They can reach 65 mm in length. They are slender and flattened. Elytra are reddish brown with a few distinct ridges. The pronotum and head are much darker. The margins of the thorax have a few large spines and usually several smaller ones. Antennae are over half of the body length and tend to lay back along the length of the body. The eyes partially surround the base of the antennae. The mandibles are fairly large.

Habits: Adults lay eggs in crevices in the bark of the snags, logs, and stumps of Douglas fir, pines, firs, and redwoods. Larvae excavate large tunnels within the sapwood and heartwood. Although detrimental to the logging industry, they are a naturally occurring element of western forest ecology. Larvae significantly help to speed the deterioration of dead trees. Trees killed by fire or infestation or other insects are often mined at the base by the Pine Sawyer, making them fall quickly. This helps to deter forest fires. The feeding habits and form of the larval mandibles gave a logger the idea for the modern chain saw. Their life cycle lasts several years. Adults emerge in July and August.

Range and Habitat: Ergates spiculatus occurs throughout mountain forests of the western states and north to British Columbia. Adults can be found in the canopy and amongst snags, stumps, and downed logs. Larvae are found within wood.

Abundance: Uncommon.

Ecological Role: Pine Sawyers significantly increase the rapidity of snag, stump, and log decomposition by mining large burrows into the heartwood. Unfortunately, they can also greatly diminish the value of salvage timber where they are abundant.

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