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Muchas gracias Piluca,

Just as a possible confirmation, I have found a photo of a female B. cruciatus female on flickr (https://hiveminer.com/Tags/bombylius,macro/Interesting), and it looks just like the one in my photo.
I think that I'll tentatively classify it as a cruciatus female.
Thank you so much for your help. Please let me know if you need some records of Bombyliidae for your work. I have GPS coordinates for every observation I made with the correspondent photos, and I will be happy to share them with you.
Kind regards,

Fernando