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Hardwood Stump Borer Beetle (Mallodon dasytomus)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Hardwood Stump Borer Beetle



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The durable Hardwood Stump Borer Beetle male has quite a set of jaws on it, but its the larvae that do the most damage to trees.



Updated: 01/17/2019; Authored By Staff Writer; Content ©www.InsectIdentification.org
Large thick pincers (jaws) on the males are quite intimidating. Fine hairs grow on the inner edge of each pincer. The robust size of the beetle is actually a little surprising, too. They have larger, thicker mouth parts than females. Males also have a longer, more slender body, while females are rounder. All Hardwood Stump Beetles are a dark brown, almost black with a smooth, matte finish. They have a boxy thorax with fine teeth on the outer edges. Adults feed on ants and other insects. Both genders are capable of inflicting a painful bite if disturbed, but they do not go out of their way to attack.

The larvae of this species is usually found inside tree stumps, decks and other wooden structures. Sometimes it is found in living trees that have not been cut down. The eat away at the wood as they develop. They leave holes in the wood as they exit the tree. It can take 3 to 4 years for a grub to fully mature. Most types of hardwood trees can serve as hosts for this type of beetle like willow, maple, oak, elm, and pecan trees. In large numbers, Hardwood Stump Borers can negatively impact furniture, flooring, and other wood-based industries.




General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
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Spiny / Spiky insect icon




Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Coleoptera
        Family: Cerambycidae
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          Genus: Mallodon
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            Species: dasytomus
Identifying Information
Size, Colors, Features
Scientific Name: Mallodon dasytomus
Other Name(s): Tooth-Necked Longhorn Beetle
Category: Beetle
Size (Adult; Length): 35mm to 50mm (1.37" to 1.96")
Colorwheel Graphic Colors: black; brown
Descriptors: jaws, spikes, flying
Relative Size Comparison
Typical Range Between 35mm and 50mm
Lo: 35mm
Md: 42.5mm
Hi: 50mm
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 Hardwood Stump Borer 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 Hardwood Stump Borer Beetle. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.

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