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Thanks Theo!! H. pluvialis is perfectly fine, good learning for me. I compared the antenna of my specimen with this picture from Steven Falk's Flickr page and thought that in my specimen the notch was much more subtle (and this got me off the right track):
https://www.flick...590233331/

I attach one more photo where the notch is more visible.

And thanks also for the tip regarding the right angle of view of the frons. Hopefully next time it will be better. :)