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White-spotted Sawyer Beetle (Monochamus scutellatus)


Detailing the physical features, habits, territorial reach and other identifying qualities of the White-spotted Sawyer Beetle



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Image Credit: Troy D. taken in Maine
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Image Credit: Spork S. from Corning, NY
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The White-spotted Sawyer Beetle can be found near most evergreen forests, the breeding grounds for their tree-boring larvae.



Updated: 05/27/2020; Authored By Staff Writer; Content ©www.InsectIdentification.org
A single white spot at the top of the elytra (wing coverings) adds a pop of color to this black beetle. Smaller white speckling may be visible on the eltyra of some individuals as well, but it may also be absent. Females are more likely to have this white speckling than males. The White-spotted Sawyer Beetle has a spike, or a protrusion, coming out of each side of its collar area. This species is a type of Long-horned Beetle so extraordinarily long antennae (also called 'horns') reach out far beyond the head. In fact, their antennae can be up to 3 times longer than their actual bodies.

This beetle prefers conifer trees like pine, spruce, fir, and can be found in evergreen forests. They may also be found in areas where evergreen branches are freshly cut, like lumber yards. Females lay eggs on the tree and when the larvae hatch, they bore deeply into the wood of dead or dying trees. Adults are active in the daytime and eat twig bark.




General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
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Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Coleoptera
        Family: Cerambycidae
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          Genus: Monochamus
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            Species: scutellatus
Identifying Information
Size, Colors, Features
Scientific Name: Monochamus scutellatus
Category: Beetle
Size (Adult; Length): 18mm to 25mm (0.70" to 0.98")
Colorwheel Graphic Colors: black; white
Descriptors: spot, antennae, flying, tree pest
Relative Size Comparison
Typical Range Between 18mm and 25mm
Lo: 18mm
Md: 21.5mm
Hi: 25mm
Territorial Map*
U.S., Canada, and Mexico
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Alaska  
Hawaii  
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the White-spotted Sawyer Beetle may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the White-spotted Sawyer Beetle. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.

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