Identification of beetles (Coleoptera)

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06.05.2018 22:37, Victor Titov

Hello, I need help with 5 types of beetles. All taken today, in the Moscow region.

1. Chrysomela populi or Chrysomela saliceti? I don't see any difference at all... Two individuals were sitting on a willow tree.

The angle is not very good (for 100% determination, you need to see the vertex / suture angle of the elytra), but I will assume that Chrysomela populi-Chrysomela saliceti will be more beautiful, and poplar will be more massive and larger. But this is not the main thing: C. populi has a black dot on the apical / sutural angle of the elytra (by the way, in my opinion, it is guessed in the first photo), when both C. saliceti and C. tremula do not have it. And you can't even navigate by the food plant here: all three species can feed on poplars (including aspen) and willows.

2. Very numerous beetles on the cuff.

Galerucella tenella

5. Crepidodera aurata?

Very likely.

This post was edited by Dmitrich - 06.05.2018 22: 43

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06.05.2018 22:48, Zum-Graat

The angle is not very good (for 100% determination, you need to see the vertex / suture angle of the elytra), but I will assume that Chrysomela populi-Chrysomela saliceti will be more beautiful, and poplar will be more massive and larger. But this is not the main thing: C. populi has a black dot on the apical / sutural angle of the elytra, when both C. saliceti and C. tremula do not have it. And you can't even navigate by the food plant here: all three species can feed on poplars (including aspen) and willows.

I didn't immediately realize that the "apical angle of the elytra" is in the back of the beetle

, there really are points there, so poplar. Thank you for such a clear indication for the difference.
There was also an aspen leaf-eater, and there were a few almost identical poplar and willow trees.