Violet Black-legged Robber Fly

Dioctria atricapilla

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.
Violet Black-legged Robberfly (Dioctria atricapilla) It could almost be mistaken for a common or garden fly (and robberflies are 'true flies') but like all robberflies, this is actually a superb flyer, no respecter of reputations and a ruthlessly efficient killing machine.

https://www.youtube.com/watch?v=rWq7o9jIYsY                           Dioctria atricapilla,Geotagged,Summer,United Kingdom

Status

There are 24 locations in the United Kingdom where it's a protected species, mostly in England. It can be found throughout European and Asian grasslands.
Blue-eyed black fly, Heesch, the Netherlands  Dioctria atricapilla,Europe,Heesch,Macro,Netherlands

Behavior

Like all robber flies, the violet black-legged robber fly feed by perching on lower stems of grasses and attack prey as it flies by. The larvae usually grow up in dung piles or decaying organic matter, but they can also be in regular soil.

Courting behavior involves the male leading the courtship dance in front of the female. If she isn't impressed, she'll rapidly move her wings or fly away, otherwise the male will begin copula.

Habitat

Like all robber flies, the violet black-legged robber fly feed by perching on lower stems of grasses and attack prey as it flies by. The larvae usually grow up in dung piles or decaying organic matter, but they can also be in regular soil.

Courting behavior involves the male leading the courtship dance in front of the female. If she isn't impressed, she'll rapidly move her wings or fly away, otherwise the male will begin copula.

References:

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Taxonomy
KingdomAnimalia
DivisionArthropoda
ClassInsecta
OrderDiptera
FamilyAsilidae
GenusDioctria
SpeciesD. atricapilla