Identification of Hymenoptera (wasps, bees, ants)

Thank you, here are two more photos of the right, smaller one

Good afternoon. Ants nest under a board in a meadow. August. Novgorod region. Can I specify the view?

Bees flying on a garden plot in early July, Novgorod region.
The first group of images shows bees on the wall of a barn, making nests in rotten wood.
The second group of images was taken on the flowers of a garden bell.

Once it was suggested that the first series of images - Heriades.
But Chelostoma specializes in bluebells.

The bees are small, but if you can tell them apart in the pictures, please tell me - do you want to know if they are two different genera or one?

Judging by the very first photo, it really looks like Heriades. The roller on the first tergite seems to be visible? Then indeed Heriades truncorum

Well, on the bells really Chelostoma. Like Chelostoma campanularum,
right? 5 millimeters?

Taken on June 22 in a suburban park in St. Petersburg, on a currant bush.
It seems to me that this is a leaf cutter.
But is this true, and is it possible to identify the species more accurately? Unfortunately, there is no other angle.
Thanks

On the bells - yes, very small ones. Thank you very much.

Megahila, nest on an old fir tree.
I identified it as Megachile lapponica.
Is this correct?

Well, in principle, it looks like it, but I would prefer to turn the copy in my hands..

Good afternoon. Ants nest under a board in a meadow. August. Novgorod region. Can I specify the view?

Vietnam, Nha Trang.
Try to identify ants from the photo (some of them have poor quality)

This is not Lasius flavus. Visible protruding hairs on the cheeks. This is someone from the subgenus Chthonolasius. It is necessary to carefully look at the scales of the stalk and the lower legs of the hind legs. These photos are hard to see. I'm afraid to make a mistake.

  5.

Alexander, thank you.
Unfortunately, there are no comprehensive and good images of these angles. I'll try to take it in quantity.

Unfortunately, only snapshots. If a specific angle can help, what is it?
Thank you.

It would be interesting to see the last segments of the abdomen and face front view

By the way, I wrote to you in PM, did not get the message?

Alexey, good evening. I read your email and managed to send a response.
About the megahill. Here's what I was able to dig up from my face and the tip of my belly.

Ukraine, Rivne region, April 8.
Can Pompilidae be identified ? Anoplius infuscatus ?

I've seen this before somewhere. They were not eggs, but cocoons. I don't remember which ones.

A fly of some kind, so not in the subject.

Identify the osu, if possible. July 7, Pskov region

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And what are those white spots on the crown of his head and chest ?

Can you tell me if it's a hornet? I crawled on the grass for a long time, but I couldn't take off.
(Middle Urals, mid-September).

Probably smeared with something