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Now that I have learnt a bit about Cylindromyia, I am 'almost' convinced that this might be Cylindromyia auriceps.

I am adding a detailed picture (well, nearly, you cannot expect miracles with a compact, hehehehe) of the scutellum. I can see two lateral pair of bristles and no apical one.

As I don't have complete keys of the Spanish Cylindromyia spp., here is a list of the species found in my country, just in case it helps.

Cylindromyia (Calocyptera) intermedia
Cylindromyia (Conopisoma) rufipes
Cylindromyia (Cylindromyia) bicolor
Cylindromyia (Cylindromyia) brassicaria
Cylindromyia (Cylindromyia) brevicornis
Cylindromyia (Cylindromyia) pilipes
Cylindromyia (Cylindromyia) xylotina
Cylindromyia (Dupuisia) crassa
Cylindromyia (Exogaster) rufifrons
Cylindromyia (Neocyptera) auriceps
Cylindromyia (Neocyptera) interrupta
Cylindromyia (Neocyptera) scapularis
Cylindromyia (Ocypterula) pusilla
Cylindromyia (Partheniella) aurora
Cylindromyia (Plesiocyptera) rubida

Not an easy task in Spain ;) But difficult tasks are the enjoyable ones :D