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I don't have alot of experience with Pollenia. I try to help you because usually Pollenia questions go unanswered. I have all of the pdf files from Knut Rognes but I have yet to study Pollenia. I think that the cerci/surstyli resemble the rudis-group, which is why I suggested that you start with this group. My first impression is angustigena. I cannot find a list of species for Serbia. I don't think that angustigena is listed. rudis is the most common species, I think. Yet I remember reading data about angustigena being more abundant in August.

In the world of spiders, a minor detail in a drawing is not to be overlooked. If a conductor of a pedipalp has a serated edge in a drawing, then it will have a serrated edge on the actual pedipalp. I say this because I do not know how to interpret the drawings of Knut Rognes. Further, I do not know all of the terminology for genitalia. I think that the serrated part that I mentioned earlier is called the hypophallic lobe? let's just call it the hypophallic lobe for now. The hypophallic lobe in your photo looks like it has a serrated edge. Further the darkened area is toward the inside of the lobe. The drawings of Knut Rognes show a darkened area to the outside of the lobe and no serrated edge. I think that this is important but maybe it is not. An expert will have to clarify this matter. If the serrated edge is an unimportant feature of the lobe, then you may have angustigena or rudis. Otherwise, you have a different species.

Serbia may have six species known. The countries surrounding Serbia have up to twelve different species listed. I do not have drawings of genitalia for these twelve possibilities. Thus, I cannot say more about this species. I am not an expert. I disagree that it matches rudis. I think that it looks more like angustigena but the hypophallic lobe? is of concern to me. [vide attachent] Maybe you can ask Knut Rognes for an identification. He has an email address on his homepage: http://knut-rognes.no/