Robber flies? for ID please

[SteveF48]

I first thought that these were Empis tessellata, now I'm not sure. They were seen on Goosegrass (Galium aparine) in June.

My insect guide books describe Empis tessellata as hairy, but the mating couple are not at all hairy.
Thanks in advance for your expert opinions.

[Dogghound]

Empis livida

Also its worth noting these are not Robberflies (Asilidae), these are usually called dance flies (Empididae).

[bugbotherer]

Good shot of the nuptual gift approach to mating in Empids. I remember reading a paper on it a few years back. Males present the females with a gift and whist they are tucking in the mating takes place. One of the approaches if to present the female with a wrapped gift, the other just to present the wrapping. Nice bit of behavioural evolution in this group of flies

[SteveF48]

Thanks for the answer.
Why are they called 'Dance Flies'?
I've only ever seen them hanging around, or mating.

[Jason Green]

Afternoon Steve,

Originally Posted by SteveF48

Thanks for the answer.
Why are they called 'Dance Flies'?
I've only ever seen them hanging around, or mating.

It's on account of the way several individuals 'dance' around each other in-flight when wishing to mate.

Take care,

Jason