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The first thing you have to say is thank you to the whole organization and the participants of this great site, I am not a specialist in insects and even less in dipteros.
I often walk through the fields and photograph everything small that moves.
Then I try to classify them, with more or less success.
I've been doing stacking macro photography for some time now.
I don't know almost everything about diptera.
This, (which I confused with a kind of Sírfido) is from 08/08/2017 in Olleros de Alba (Municipality of La Robla - León) Spain



Diptero1 by Alfredo M. Rubio, en Flickr

You can help me identify him.
Greetings and thanks:
Alfred

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Details of another specimen

Diptero2 by Alfredo M. Rubio, en Flickr

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Family Bombyliidae

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Thank you John.
It does look like the wing's nerve matches. I take note.
Greetings

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I would be bold enough to say Villa sp., but I am not an expert as John is :-)

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Villa sp but illumination of the wings is not helpful. If Piluca is around, she knows more about Spanish Villa.

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Thank you very much for your help, Treebeard and Johnes81.
I don't quite understand what you mean by the lighting problem.
Maybe to the iridescence?
Let's see if it's okay, or tell me what the problem is.
Greetings.
I haven't seen Piluca in years, I'll try to connect.

Diptero3 by Alfredo M. Rubio, en Flickr

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Well, thank you Luis Lafuente (Jardín de Mariposas de Grado), who connected with Piluca, she said:
The fly is a Villa sp. of the Villa Hottentota species group.
This genus is very difficult and is badly studied in the Iberian Peninsula.
Normally the species can only be determined by dissection of the genitalia.
And there are not even the genitalia of all the species available in the literature, so many times the determinations are doubtful.
The best thing is to leave it in Villa sp., group Hotenttota.
I hope this will be helpful, even if it is impossible to reach the species.

So, many thanks to Piluca for her help.

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first of all, dna is your best bet if you cannot find an expert to assist you with your id. it is expensive but it is useful in the case of poor documentation. I use dna testing from time-to-time but usually for spiders. I am currently researching dna kits for future usage.

genitalia is typically not included in publications if the author(s) feel that it is not necessary for identification. outdated material about Bombyliidae uses descriptions like keys which are prone to error nowadays because of new discoveries or overlooked problems (such as loss of bristles, hairs or scales.) However, modern keys do exist for many Bombyliidae. Even amateur work exists. for example: http://www.entomo...-Falck.pdf

certain Bombyliidae may need a revision but dna tests will be your key to the future. you can store the results in Bold Systems database. Such storage can be used after a revision has occurred to arrive at the newfangled species. I have records in the database for spiders. http://www.boldsy...

i do not know how you made your photos but it looks like flash is used. The wings are illuminated and unnatural in appearance. The wings almost look like glass or ice ( blown out by a strong lightsource.) Wing infuscation is barely detectable in these photos.

it is an overstatement to say that it is 'impossible to reach the species'. Even i am working on genitalia for Bobmbyliidae but it takes time to collect all of the species, dissect, identify (even if dna is necessary), then put together documentation. such a process will take years. I'm currently documenting Bombylius. I will continue to work on Villa this year. I'll add Villa genitalia to the diptera.info gallery when i can do so. However, genitalia can already be found here:

https://diptera.i...to_id=5492