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robber fly
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Robber fly (Asilidae) Diagram showing diversity among dipterans
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Robber fly (Asilidae)
Robber fly (Asilidae)

robber fly

insect
Also known as: Asilidae, assassin fly
Written and fact-checked by
Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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robber fly, (family Asilidae), any of about 6,750 species of predatory insects, worldwide in distribution, in the fly order, Diptera. Robber flies range in length to almost 8 cm (3 inches), making them the largest of all flies. Most are dull in colour, and their stout, often hairy, bodies resemble those of bumble bees. Between the large-faceted eyes is a moustache of bristles. The long legs are adapted to capture prey in flight and to...

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