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Horse-bean Longhorn Beetle (Trachyderes mandibularis)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Horse-bean Longhorn Beetle


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Image Credit: Steve P., taken in Cabo, MX
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Image Credit: Lisa S. from Houston, TX
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The large Horse-bean Longhorn Beetle lives in and loves states in the southern latitudes, from coast to coast.



Updated: 01/04/2022; Authored By Staff Writer; Content ©www.InsectIdentification.org
Horse beans are large edible broad beans or fava beans. The plant is tender and uses a trellis, woody shrub, or tree as a growing support. The Horse-bean Longhorn Beetle lays its eggs on a variety of trees commonly found in southern United States and Mexico. Citrus, ficus, willow, and hackberry trees are common host plants. Larvae hatch and bore into the trees where they remain until they emerge as adults. Bright red/fuchsia saguaro cactus fruits are a juicy food source for populations living in or near the Sonoran desert.

Male Horse-bean Longhorn Beetles have large jaws extending from the head that are used to battle other beetles trying to partake of a claimed cactus. Females lack these menacing mandibles. The black beetle has two thick, bright orange or yellow bands across each elytron (wing covering) that may or may not connect. A black line runs down the center of the back. Long antennae have alternating bands of black and yellow with curved yellow tips. Legs are black at the base and then yellow through to the foot.©InsectIdentification.org


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General Characteristics


Capability, Shape, Texture/Pattern, Benefits, Dangers
Flying insect icon
Pest insect icon
Striped or banded insect icon


Taxonomic Hierarchy


Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Coleoptera
        Family: Cerambycidae
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          Genus: Trachyderes
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            Species: mandibularis

Identifying Information


Size, Colors, Features
Scientific Name: Trachyderes mandibularis
Other Name(s): Long-Jawed Longhorn Beetle
Category: Beetle
Size (Adult; Length): 17mm to 32mm (0.66" to 1.25")
Colorwheel Graphic Colors: yellow; black; orange
Descriptors: flying; striped; tree pest


Relative Size Comparison


Typical Size Between 17mm (0.7in) and 32mm (1.3in)
Lo: 17mm
Md: 24.5mm
Hi: 32mm

Territorial Map*


U.S., Canada, and Mexico
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Canadian territory of Alberta graphic
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Canadian territory of Newfoundland and Labrador graphic
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Canadian territory of Saskatchewan graphic
Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Alaska  
Hawaii  
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Horse-bean Longhorn 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 Horse-bean Longhorn Beetle. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.
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