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Robber Fly - Diogmites (Diogmites sp.)

Detailing the physical features, habits, territorial reach and other identifying qualities of the Robber Fly - Diogmites

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Robber Flies are hanging thieves in the insect world, dropping everything when a good-looking meal flies by.

Updated: 06/01/2022; Authored By Staff Writer; Content ©www.InsectIdentification.org
Robber Flies eat an assortment of insects like biting flies and other flying insects like bees, butterflies, and wasps. This species particularly likes bees and dragonflies as well as biting flies. During the day, the Robber Fly hangs by its front legs from branches or objects near the ground, waiting to ambush passing prey. It is a fast and noisy flyer, giving chase to insects that are already in flight. When it catches something, it uses its legs to grab and take hold of the body, stopping the prey from escaping. Once captured, the Robber Fly stops on a branch or leaf and uses its durable mouth to pierce the body of its victim and then suck out its insides.

Robber Flies make a loud whirring noise as they fly because they beat their wings so quickly. They may be mistaken for a bee or a wasp because of the buzzing noise they create coupled with their large size. Robber Flies come in a variety of species. Individuals from the Diogmites genus have a few color variations and differently striped markings on the abdomen. They are also less hairy than other Robber Flies.©InsectIdentification.org

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General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
Fast insect icon
Flying insect icon
Shiny insect icon


Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Diptera
        Family: Asilidae
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          Genus: Diogmites
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            Species: sp.
Identifying Information
Size, Colors, Features
Scientific Name: Diogmites sp.
Category: Fly or Mosquito
Size (Adult; Length): 18mm to 40mm (0.70" to 1.57")
Colorwheel Graphic Colors: brown; red; green; black
Descriptors: fast; flying; buzzing; metallic; shiny

Relative Size Comparison
Typical Size Between 18mm (0.7in) and 40mm (1.6in)
Lo: 18mm
Md: 29mm
Hi: 40mm
Territorial Map*
U.S., Canada, and Mexico
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Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Robber Fly - Diogmites 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 Robber Fly - Diogmites. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.


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