Identification of beetles (Coleoptera)

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23.01.2011 6:48, Dmitry Vlasov

I believe it is a female Orthotomicus proximus, (and not Orthotomicus suturalis, as identified by akulich-sibiria).
My arguments: 1-the distance between 1 and 2 (counting from the top) teeth is approximately equal to the distance between the first teeth of the elytra. In O. suturalis, the distance between the teeth of the elytra is much greater than the distance between the teeth of one elytra.
2 - the third prong (lower) is located far from the top of the wheelbarrow and below it there are thickenings along the edge. In O. laricis, which can be confused with the female O. proximus, the tooth is located lower and there are no thickenings.
In general, identifying bark beetles from a photograph is a thankless task. The error rate may be 50% or more....

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23.01.2011 8:44, akulich-sibiria

I believe that this is a female Orthotomycus prochimus, (and not Orthotomycus suturalis, as determined by akulich-sibiria).
My arguments: 1-the distance between 1 and 2 (counting from above) teeth is approximately equal to the distance between the first teeth of the elytra. In O. suturalis - the distance between the teeth of the elytra is much greater than the distance between the teeth of one elytra.
2 - the third prong (lower) is located far from the top of the wheelbarrow and below it there are thickenings along the edge. In O. laritsis, which can be confused with the female O. prochymus, the tooth is located lower and there are no thickenings.
In general, identifying bark beetles from a photograph is a thankless task. The error rate may be 50% or more....

Dear Elizar, I admit that you are right!!! I watched my series O. laritsis, O. prokhimus, O. suturalis. indeed, this is a female prochymus. I took a quick look at it. Yes, by the location of the teeth, you are right. In laritsis, the lowest prong is located at the very edge of the wheelbarrow and the punctuation of the bottom of the wheelbarrow is clearer. In addition, you can see the wavy edges of the bottom of the wheelbarrow, which is typical just for the proximus. In general, for quite a long time I suffered with this trio, and even now there are sometimes problems.

suturalis male
picture: P3070004_.jpg

proximus female
picture: P3120014_.jpg

laricis

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23.01.2011 13:24, Dmitry Vlasov

well, here I can only judge by Siberia, we do not have such a species. Therefore, I do not particularly seek to determine the European ones. You have by the way Polygraphus poligraphus and P. punctifrons would like to see their differences visually

Polygraphs are quite well defined by females: in Polygraphus poligraphus, the "brush" of hairs on the forehead is well developed and the edges of the hairs are longer than in the center. Also, the last segment of the club has pointed antennae. In P. punctifrons, there are no" brushes " on the forehead, there are single hairs and the club is blunted (similar to P. subopacus) In the latter ,the "brush" is developed and the hairs are all short and the size of the beetle is smaller.

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27.01.2011 19:28, akulich-sibiria

Cassida-clearly two species, 1-2 C. nebulosa, 3-C. sp.
Chrysolina_2-Chrysomela cuprea or Chrysomela lapponica melanist. The striae on the pronotum differ well in the coloration of the sternites of the abdomen and in the presence of C. cuprea (the absence of lapponica).

I'm a little confused about these two types. I have a series called Chrysomela lapponica, according to Medvedev for Chrysomela cuprea it is characteristic, I quote - the pronotum is narrowed to the front, with rounded sides and a thin median lily. The main segments of the antennae, at least at the apices, and the full lateral border of the abdomen are yellow-red. Mine do not have a side border, or rather the sides of the last sternites are reddish-brown. The lower legs are partly brown too. It seems to point to lapponica. But there is one beetle, too, of a bronze-blue color without a red pattern, the paws are dark and the sternites are also all dark.
So why does the respected Mantispid, when the abdomen is black and blue (like the whole beetle), refer it to Chrysomela cuprea, I don't understand this a little, so is cuprea characterized by a completely black abdomen or should there still be a border along the side edge of the entire abdomen????
I can attach a photo later. The structure of the pronotum is quite relative, even on the site of Zina the second lapponica in the form of the pronotum also looks like cuprea

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27.01.2011 19:42, Mantispid

I'm a little confused about these two types. I have a series called Chrysomela lapponica, according to Medvedev for Chrysomela cuprea it is characteristic, I quote - the pronotum is narrowed to the front, with rounded sides and a thin median lily. The main segments of the antennae, at least at the apices, and the full lateral border of the abdomen are yellow-red. Mine do not have a side border, or rather the sides of the last sternites are reddish-brown. The lower legs are partly brown too. It seems to point to lapponica. But there is one beetle, too, of a bronze-blue color without a red pattern, the paws are dark and the sternites are also all dark.
So why does the respected Mantispid, when the abdomen is black and blue (like the whole beetle), refer it to Chrysomela cuprea, I don't understand this a little, so is cuprea characterized by a completely black abdomen or should there still be a border along the side edge of the entire abdomen????
I can attach a photo later. The structure of the pronotum is quite relative, even on the site of Zina II, lapponica also looks like cuprea in the shape of the pronotum

In fact, everything is very simple. First of all, I don't have" Medvedev "and therefore I watched it on" green", and there is not a word about the color of the abdomen in it. Secondly, the beetle is glued, and therefore it is difficult to see the entire color of its abdomen. On the pronotum, a very deep and clear median groove is noticeable, and the shape of the pronotum itself speaks for cuprea.

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