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Insect Identification

Robber Fly (Efferia) - (Efferia pogonias)

Authored By Staff Writer | Last Updated: 1/29/2014

One could mistake a Robberfly from the genus Efferia for some kind of strange black-and-white bee.

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Picture of Robber Fly (Efferia)
Pic of the Robber Fly (Efferia)
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Robberflies are considered 'hanging thieves' becaue they use their arms to suspend themselves from twigs and branches and steal a meal from unsuspecting flying insects. A passerby like a bee, wasp or other fly don't see them as they roam. If they are spotted and within range, the Robberfly will chase the flying insect, eventually overtaking them. Once caught, the Robberfly uses its legs to hold the prey and carry it to a nearby plant. It then uses its sharp mouth to stab the victim and then suck out the victim's insides.

They make a loud whirring noise as they fly because they beat their wings so rapidly. The Efferia species male is slightly darker than the female. At the tip of the male's abdomen is black 'bulb' Females do not have this feature; instead they have long needle-like ovipositors, which they use to inject their fertilizes eggs into the soil. It may look like a stinger at first glance, but it is not a stinger. Both genders can be found hanging around in open fields, parks, meadows and other dry areas.

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Category: Fly
Common name: Robber Fly (Efferia)
Scientific Name: Efferia pogonias
Other Names: Robber fly

Taxonomy:
  Kingdom: Animalia
   Phylum: Arthropoda
    Class: Insecta
     Order: Diptera
      Family: Asilidae
       Genus: Efferia
        Species: pogonias

Adult Size (Length): 13mm to 19mm (0.51in to 0.75in) COMPARE

Identifying Colors: white; black; gray; brown

General Description: flying, buzzing, noisy, fast, shiny, metallic


North American Reach (Though Not Limited To*): Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware; Florida; Georgia; Hawaii; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico; New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming; Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario; Prince Edward Island; Quebec; Saskatchewan; Mexico


* Keep in mind that insect reach is not governed by lines on a map and therefore may appear in areas/regions/states beyond those listed above.


NOTE: Material presented throughout this website is for entertainment value and should not to be construed as usable for scientific research or medical advice (insect bites, etc...). Please consult licensed, degreed professionals for such information. Email corrections / Comments to InsectIdentification at Gmail dot com.