Identification of beetles (Coleoptera)

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01.10.2009 15:13, evk

In versicolor, compared to cupreus, the pronotum border is wider, as if "flattened" at the posterior corners. The image shows this.

Here is the only set of RELIABLE external differences:
P. cupreus-head and base of pronotum rather densely and clearly dotted; hind tibiae on the inner side with a row of 8-10 light, thin and long bristles; base of pronotum usually narrower than the base of elytra.
P. versicolor-head and base of pronotum at most with small, not dense and less clearly dotted; inner side of hind tibiae with 5-7, rarely 8 short, strong and dark setae; the base of the pronotum is usually the same width as the base of the elytra.

Everything else DOESN'T WORK!
None of these features are visible in this image, which is why I asked the question, because it is better to evaluate the ENTIRE set of features. I can easily distinguish them by their habit, but this is after looking at and determining hundreds of copies. From this angle, I'm sorry.

This post was edited by evk-01.10.2009 15: 15

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01.10.2009 17:08, evk

Well, if you can tell the difference easily, what's the problem? And if no kidding, I also seem to be throwing them around quite well in terms of habit . And as for the extended lower edge of the pronotum in versicolor - this is a fact. Take a look at your instances, if possible.

Just by analogy and about the variability of these two species: in our region, you don't even need to think about the south - 99% of cupreus have red-brown legs, while versicolor never has such legs. However, there are exceptions, those with red legs are also found with black legs. And the border varies so much that it doesn't pull as a leading sign. I've reviewed it specifically now.
But the conversation is not about that, but about the fact that this photo is 50% by 50% (although I myself am also inclined to versicolor, but there seems to be no reason for that

). You can safely call both this and that - no one will refute all one

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02.10.2009 7:23, akulich-sibiria

Good day to all!!
Please help me with this friend. Like a grinder. and it seems to be from the genus Ernobius and there is an assumption that the species is E. explanatus Mnnh.

Something in the area it is not very. But there is another one in the fauna of the USSR. A very similar species is E. fobos Golt. and the area is just the Krasnoyarsk Territory. But there is something strange to say about highlighting it in a separate view. What does it count as now?
It was caught in a bark beetle trap in the vicinity of Krasnoyasrka, a pine forest with an admixture of spruce.
Pronotum with flattened edges. the side edges are sharp. the body is red-brown, with a small red spot on the top of the elytra. The points on the elytra are tangled. they don't form rows. There is no bump on the pronotum. eyes without recesses, rather large.
The last three segments of the antennae are enlarged. The remaining segments are almost equal in length and width.
picture: P3210066_.jpg