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Thank you, Johnes81 (Is it a true way to call you with your nick?). I'm not a real entomologist, forgive me, if I misunderstand you. But it seems to me, there are 5 acrostichal bristles - 2 on the front part of thorax, and 3 on the back part. This photo is the best, alas. All I can do - to crop the photo with a less distortion. May be, you can see better with this file?