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This keys out to D. venustus as you suggest. The pale antennae, black and yellow side margins of the tergites and the black stripe on the hind margin of sternite 2 all point to D. venustus.

Interestingly, there may be a species compelex hiding behind D. venustus and it's close resembling 'sister' species of D. hilaris.

Greets,

Ectemnius