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Came to my hand (Spain: Huesca: Torla-Ordesa: Ordesa Circus; about 1700 masl, 21/08/2020)

With the online interactive keys (CERRETTI, TSCHORSNIG, LOPRESTI, DI GIOVANNI. (2012) keyed out Tachina and then followed this steps to species with TSCHORSNIG, H. -P. , HERTING, B., RAPER, C. M., RAYNER, R. 2002.

Calyptrae white
Thorax with only the normal short black hairs
There are 3 intra alar setae (3 ia) behind the suture (so it's not praeceps)
Frons in males about 1.1x (1.05-1.15) as wide as one eye (seen dorsally, measuring with Photoshop).
Fore tarsus black.
Males: anterior claws clearly shorter than the last 2 tarsal segments combined (Ts5+Ts4)/Claw=1.5)
Frons with at least 1 outer orbital bristle.

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Frons in males about 1.1x (1.05-1.15) as wide as one eye (seen dorsally, measuring with Photoshop).
Anterior claws clearly shorter than the last 2 tarsal segments combined (Ts5+Ts4)/Claw=1.5)

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Sex is male
There are 3 intra alar setae (3 ia) behind the suture (so it's not praeceps)
Frons with at least 1 outer orbital bristle.

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Achrostical setae shown as red circles
(unknown presutural/4 postsutural)
Dorsocentral setae shown as green circles
(unknown presutural/4 postsutural)
Intraalar setae shown as blue circles
(1 presutural/3 postsutural)

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Frons with at least 1 outer orbital bristle.

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Hi Rafael,

You did a great effort, but these Tachina are a total mess.
You could very well be right, but this male has 2 proclinate orbital bristles. A “typical” nupta ( if such a thing exists” has only one.

I’d say: check the genitalia. Cerci in lateral view is qwuite different between fera and magnicornis, maybe for nupta as well ?

Theo

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Thanks Theo, this one was not collected, sorry. Looking externally, I think the genitalia must look similar between these species. This is a supposed male T.magnicornis:
https://www.biodi...11982.html

The key says for T.magnicornis: anterior claws longer than the last tarsal segment (and for T.nupta: anterior claws at most as long as the last tarsal segment) so now I think it fits better with T.magnicornis (and T.nupta is not recorded in Spain). In the picture (fore leg with the apex horizontal), the claws are 0.69 px and the last tarsi 0.28 px.

And also, If the tergite assignation is correct, the black longitudinal abdominal stripe widens towards the end on tergite 5 and is not ending in a point (see T. nupta https://www.dipte...d_id=97804 to see the difference)

But in Spain there is also T.casta and is not in the (central) European Keys and don't know how it is.