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Hi
I have only one specimen of this species. Using Chavala, 1969 I end up with Tachydromia aemula. Would someone agree that this is the correct ID.
Captured in Faroe Islands. Only Hybotidae species reported from here are Platypalpus nigritarsis and P. longicornis which I also have found in this same habitat (plantation).

Thanks
Jógvan F

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ventral

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Hi
I try again :)
This could be T. aemula or T. arrogans. I think it is T. aemula as the hind tibia is not completely dark and almost all the hind coxa is yellow.

Would appreciate a correction or confirmation :)

Thanks
Jógvan F

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I think you still have the specimen? Is the occiput completely shining? If so, it's T aemula, but I'm not sure from the photos.

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I am not able to find the specimen now. But I found some photos that I have taken not far from where that one was collected. I have three photos. 2 are of the same individual and the other individual which is feeding on a sciaridae.
The original specimen was collected in a small plantation. The other two specimen in two gardens about 90 apart from the plantation. I assume we only hava a single species of this genus which is most likely only active in august and september.
What I see from these photos is that it is shiny a bit behind the eyes (postocular margins?) while on the back of the head it is prunose. So...would it be T. aemula or T. arrogans?

Thanks
Jógvan F

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Tachydromia sp on leaf of rhubarb in garden

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Tachydromia sp on leaf of rhubarb in garden

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It's hard to decide from the 3 images: the first one (with the prey) seems to have the shiny aemula head.
But comparing your fly to Chvala's description again I've found an intersting detail in your first photo: "radial vein closer to and not so upturned to costa, ending only gradually." (Chvala)
That's what your image shows!

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Those words are form Chvala, 1970 for T. aemula, which means that you think it is most likely that species :)

So it is probably best to leave it as T. aemula.

Thanks
Jógvan F

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Hi,
Here is typical T. aemula:
https://diptera.info/forum/viewthread.php?thread_id=116546

Best wishes,
Igor Shamshev

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Thanks Igor
Do you have opinion which species my specimen are?

Thanks
Jógvan F

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I think that your identification is correct, T. aemula.
In T. aemula the occiput is not completely shiny, it is with smaller area of pruinosity than in T. arrogans (just a spot on middle portion). T. aemula is somewhat variable in wing length.
The best comparison of these species can be found in Collin's British Empididae (p. 85).

Best wishes,
Igor Shamshev

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Thanks Eric and Igor :)

We will confirm this as T. aemula

Thanks
Jógvan F