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Ah - this is my first Blondelia, so I did not know what to look for. Now I learn that the females have a jagged "saw belly" - interesting! I hope I can recognize the males too - once you wrote that they have red lateral spots on tergite 3 and 4. This character is, however, also found in B. pinivorae https://www.zobod...1-0334.pdf. The key given in that paper should help to exclude that species.
Anyway, thanks for the ID!