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robber fly

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noun
  1. any of numerous swift-flying, often large, dipterous insects of the family Asilidae that are predaceous on other insects.
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Origin of robber fly

First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for robber fly

robber fly

noun
  1. any of the predatory dipterous flies constituting the family Asilidae, which have a strong bristly body with piercing mouthparts and which prey on other insectsAlso called: bee killer, assassin fly
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012