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Hello Colobo. I am stunned by your post because I have not read something like this before. I like Calliphoridae but I am not yet scientific about them. I have very little experience with diptera. I've only studied for the past year. I've observed and recorded data for the last four years but this is the first year of proper study for me.

" Interestingly only calliphorids of genus Onesia had such pollinic sacs sticken on face."
I am stunned because you are absolutely correct that this is Onesia and I haven't shown a photo. I've examined three similar species and two are Onesia. I cannot yet place an id because only O. floralis is listed for Berlin area. This fly is not floralis. Dr. Knut Rognes does not have drawings of the ovipositor for austriaca and kowarczi. I can eliminate zumpti because of a Swiss document co-authored by Dr. Knut Rognes. I assume that this fly is austriaca but I intend to write to an expert for help. Mostly because a very similar species matches Bellardia not Onesia. Anyway, this species with the "odd growth" is in fact Onesia.

I suspect that this substance is pollinic sacs but I also think that Sir Paul is correct. I still think that the fly also has a deformation of some sort. I say this because the ovipositor matches Onesia but one of the spermathecae is deformed. I will post more photos here if the interest remains. I would love to read more opinions about this fly.

very interesting posts here. I am excited that my fellow dipterists are interested in this subject. Good stuff :)

I will be back to post some photos...