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#3886 · 🪰 flies & mosquitoes

violet black-legged robber fly

🇳🇱 Zwarte bladjager ·Dioctria atricapilla

🪰 Flies & mosquitoes 📍 in the Netherlands
violet black-legged robber fly, Groesbeek, Nederland, photo 1 of 10
1/10· 📍 Groesbeek, Nederland © Herman Berteler · CC BY-NC 4.0

what is it?

The violet black-legged robber fly , Dioctria atricapilla , is a species of robber fly in the subfamily Dasypogoninae. This 9- to 12-millimeter long insect has a wingspan of roughly 7 to 9 mm and short, three-segmented antennae. It's a predatory insect, feeding mainly on smaller flies and predatory hymenopterans. It primarily thrives in grassland, and is seen from May to July.

base stats

  • NL sightings 39iNaturalist, research grade
  • worldwide 1,101iNaturalist observations

Bars compare against all animals on log scales: up to 300,000 Dutch and 600,000 worldwide sightings (the most-seen species), 150 t (blue whale), 30 m and 400 years (Greenland shark).

fun facts

  • Spotted 39 times in the Netherlands on iNaturalist.
  • 1,101 observations worldwide on iNaturalist.
  • Scientifically named by Johann Wilhelm Meigen in 1804 (222 years ago).

fact sheet

English
violet black-legged robber fly
Nederlands
Zwarte bladjager
scientific name
Dioctria atricapilla
class
Insecta
order
Diptera
family
Asilidae
sightings in NL
39
sightings in Europe
982
sightings worldwide
1,101
GBIF records in NL
4,095
weight
—
length
—
lifespan
—
named
1804 by Johann Wilhelm Meigen

relatives· Asilidae

Sources: iNaturalist taxon 547115, Wikidata Q1887957, GBIF 1656376, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.

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