Winter stonefly - Brachyptera cf seticornis

My first photo of a representative of this class of insects. The identification of the species is debatable, but based on some scientific articles that I have read, regarding their distribution in Bulgaria, and on external features, I think it corresponds most accurately to the photographed specimen. It appeared in an unusual urban environment - on the window of my apartment in Sofia in the presence of strong wind and bad rainy weather. I still managed to get a few photos of it before the wind blew it off in an unknown direction. As of 2013, there are 17 recorded species of winter stoneflies in Bulgaria.