Identification of Hymenoptera (wasps, bees, ants)

Community and Forum → Insects identification → Identification of Hymenoptera (wasps, bees, ants)

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28.10.2015 12:32, AVA

Most likely, it is E. coarctatus and / or E. pedunculatus. But here even the pubescence of these parts will not help (it is similar for them), you need the pubescence of the last segment of the flagellum and the punctuation of the last sternite in the male and the pubescence of the basins in the female. All this is not visible. In short, we need the instances themselves.

And it also seems to me that Nos. 1-3 are noticeably different from the rest with the sculpture of terites. Maybe it's the gender, though.

But No. 3, in addition, has a reduced light pattern on the chest, including tegulae, and tergites of the abdomen. And at the same time, he has an unusual form of light baldric on the 1st tergite. A melanist? Intraspecific variability?

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28.10.2015 23:16, Кархарот

And it also seems to me that Nos. 1-3 are noticeably different from the rest with the sculpture of terites. Maybe it's the gender, though.

But No. 3, in addition, has a reduced light pattern on the chest, including tegulae, and tergites of the abdomen. And at the same time, he has an unusual form of light baldric on the 1st tergite. A melanist? Intraspecific variability?

More likely because of the floor plus different lighting.
I can't say anything about the color, as it is necessary to review a lot of material from this particular area in order to learn how to distinguish them by color. In the Crimea, I can distinguish all 9 species by color, but even then, only by females and if you can see not only the general body pattern from above, but also the platypus. Males are more difficult to deal with, and several species have similar coloration. And the variability is enormous, even in the same area and from the same nest. Reliable signs are the last segment of the tendril and the seventh sternite. Well, pubescence is also important, of course.

By the way, sorry for the offtopic, does anyone happen to have a photo of Pachycephus cruentatus (needed for the red Book of Crimea)? I looked at the material at the Moscow State University Zoo Museum , but it was all broken, and I didn't find it in Zina at all.

This post was edited by Carcharot - 28.10.2015 23: 18

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29.10.2015 0:43, Пензуит

More likely because of the floor plus different lighting.
I can't say anything about the color, as it is necessary to review a lot of material from this particular area in order to learn how to distinguish them by color. In the Crimea, I can distinguish all 9 species by color, but even then, only by females and if you can see not only the general body pattern from above, but also the platypus. Males are more difficult to deal with, and several species have similar coloration. And the variability is enormous, even in the same area and from the same nest. Reliable signs are the last segment of the tendril and the seventh sternite. Well, pubescence is also important, of course.

I rummaged among the photos of eumenes of poor quality, and I think I found some types of not quite characteristic color. Of course, just intraspecific variability is possible.

1. Probably Eumenes papillarius? The location of the yellow color is not the same as that of those previous eumenes.

picture: DSC06258_24.JPG

2. This eumene turned out very badly. But you can see that from the yellow on it only two transverse stripes on the abdomen. Although from such photos, I don't even hope that you can determine something

3. This one has only two small yellow spots on the entire thoracic region. Unfortunately, the abdomen could not be removed at all.

picture: DSCN8193_1.JPG

This post was edited by Penzuit - 29.10.2015 00: 57

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30.10.2015 23:00, Кархарот

I rummaged among the photos of eumenes of poor quality, and I think I found some types of not quite characteristic color. Of course, just intraspecific variability is possible.
1. Probably Eumenes papillarius? The location of the yellow color is not the same as that of those previous eumenes.

2. This eumene turned out very badly. But you can see that from the yellow on it only two transverse stripes on the abdomen. Although from such photos, I don't even hope that you can determine something

3. This one has only two small yellow spots on the entire thoracic region. Unfortunately, the abdomen could not be removed at all.

1. It is possible, but no signs are visible.
2-3. Already answered, this is not eumenes, Discoelius, the signs of the species are also not visible.

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03.11.2015 0:11, Пензуит

Thank you for all the definitions! It is still a mystery to me-how do you distinguish Polistes Nimpha from Polistes Dominula? As I understand it, Dominula is somewhat larger, all the spots and stripes are wider, the antennae are red. And Nimpha is smaller, its spots and stripes are narrower, there is a little dark color on the antennae? Or do I need to look at other signs?

For example, who is it? All - Penza region, July-August

1. ???

picture: DSCN1417_15.JPG

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2. ???

picture: DSCN2084_15.JPG

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3. ???

picture: DSCN1464_16.JPG

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4. ???

picture: DSCN8657_16.JPG

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5. ???

picture: DSCN9748_15.JPG

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6. ???

picture: DSCN9949_15.JPG

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7. ???

picture: DSCN1829_15.JPG

This post was edited by Penzuit - 03.11.2015 00: 23

03.11.2015 0:47, ИНО

There is a flag, but only AVA knows it and keeps it secret until it is published. about the mustache: in the dominula, they are always bright orange (starting from the second segment of the flagellum) in the nymph, they are darkened from above, but the intensity of this darkening varies from almost complete (black color) until it is practically absent (orange color). So this feature is not reliable. You noticed the color patterns correctly, but this also varies greatly. Especially often in the keys appears the color of the last sternite of the abdomen. In nymphs, it is black (sometimes brownish at the end), in dominus it is yellow in the distal part, but in fact it is also pure black, although rarely. Males differ very well in the shape of the head, platypus and the last segment of the antennae. Therefore, 7 is definitely P. dominula. For the rest, I will only say presumably:
1-P. dominula;
3-two different wasps in fact-look at the drawing of the mid-spine, but, like, both P. dominula;
5,6 - P. biglumis, but here the share of confidence is even less, since I personally did not encounter this species at all. I just remembered that there is another similar species - P. bischoffi, which I am also not familiar with.
2-a strange combination of signs: for most - dominant, but confused by the reduction of the yellow pattern of the midrib and imagines its increased furiness.
But nothing, AVA will come-it will determine more precisely.

This post was edited by ENO-03.11.2015 01: 00

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03.11.2015 9:34, TimK

There is a flag, but only AVA knows it and keeps it secret until it is published. about the mustache: in the dominula, they are always bright orange (starting from the second segment of the flagellum) in the nymph, they are darkened from above, but the intensity of this darkening varies from almost complete (black color) until it is practically absent (orange color). So this feature is not reliable. You noticed the color patterns correctly, but this also varies greatly. Especially often in the keys appears the color of the last sternite of the abdomen. In nymphs, it is black (sometimes brownish at the end), in dominus it is yellow in the distal part, but in fact it is also pure black, although rarely. Males differ very well in the shape of the head, platypus and the last segment of the antennae. Therefore, 7 is definitely P. dominula. For the rest, I will only say presumably:
1-P. dominula;
3-two different wasps in fact-look at the drawing of the mid-spine, but, like, both P. dominula;
5,6 - P. biglumis, but here the share of confidence is even less, since I personally did not encounter this species at all. I just remembered that there is another similar species - P. bischoffi, which I am also not familiar with.
2-a strange combination of signs: for most - dominant, but confused by the reduction of the yellow pattern of the midrib and imagines its increased furiness.
But nothing, AVA will come-it will determine more precisely.

In my opinion, No. 6 is a nymph. The cheek is yellow and the stripes on the back are bright.
# 5 - I don't know.
The rest are dominoes.

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03.11.2015 10:08, AVA

Thank you for all the definitions! It is still a mystery to me-how do you distinguish Polistes Nimpha from Polistes Dominula? As I understand it, Dominula is somewhat larger, all the spots and stripes are wider, the antennae are red. And Nimpha is smaller, its spots and stripes are narrower, there is a little dark color on the antennae? Or do I need to look at other signs?

For example, who is it? All - Penza region, July-August

Comparing these two species, forget about the differences in size and body color features - all yellow spots vary greatly in shape and size depending on the habitat and specific conditions of larval development, even within the same family. The same goes for body size.
The only persistent feature associated with coloration is completely red (after the 3rd segment) antennae in P. dominula and more or less darkened from above antennae in P. nimpha.

Males of these species differ better:
- in P. nimpha, the platelet is flat with developed lateral rollers, the tubercle between the bases of the antennae has a clear longitudinal furrow, the last segment of the antennae is approximately 3-3. 5 times longer than its thickness, the breast is yellow from below;
- in P. dominula, the platypus is uniformly convex and without lateral ridges, the tubercle between the bases of the antennae is without or with a barely noticeable groove, the last segment of the antennae is about 2 times longer than its thickness, the breast is usually black from below.

As a matter of fact, in addition to P. dominula, only three parasitic species (P. atrimandibularis, P. semenowi, and P. sulcifer) of our polistae of the nominative subgenus are characterized by completely rufous antennae, which are distinguished by their mandibles depressed from the outside, as well as mainly southern P. gallicus and eastern P. chinensis.

Of course, there are signs of sculpture, but they are usually not visible in photos.

Now, based on your photos:
1-4. Females of P. dominula
5-6. Females of P. nimpha
7. Male P. dominula

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