Identification of Hymenoptera (wasps, bees, ants)

There is no specific data on this type of data, and it is poorly understood. But from the experience of studying other species with similar biology, we can say that most likely all will fly away. Well, or at most one or two females will nest somewhere nearby. They won't stay near the nest for long. But the males (they come out a little earlier than the females) can be on duty there for some time, until all the females come out of there.
And the nest is great!

Males do not work, only fuck and suck nectar from flowers. It's probably just two females nestling next to each other.

What, right now they are building and provisioning the same cell?

And where is this hole located? In general, three species of Eumeninae are known, in which several females build one nest (but each has its own cell), and the wasps of the genus Delta do not belong to them. Theoretically, maybe, but I didn't understand about the hole. As ENO correctly pointed out, if we are talking about a cell, then these wasps will not fit into it, the neck is too narrow. Can you shoot a short video story? What if the opening is planned?

M. O., Poplar
Cocoon from the caterpillar Lacanobia oleracea 20.09.2015
24.03.2016

We are not talking about cells, at night they seem to climb (the view is very bad) into the gap between the nest and the wall, but again, it is hard to see. Well, plus this happens already in the absence of sunlight, the video will not take. And in general, this year some kind of invasion of these wasps, in the past this was not the case. They fly into houses.

Good afternoon. Don't you identify the bee before the genus? I have my own version, but the experts ' opinion is interesting. Today in the city of Kiev.

Good afternoon. Don't you identify the bee before the genus? I have my own version, but the experts ' opinion is interesting. Today in the city of Kiev.

Good afternoon! Can you tell me who this is? Moscow region (Elektrougli), July. Thank you in advance.

The bee's EU has 3 submarginal cells! Most likely, this is some kind of Colletes...

Not some, but cunicularius
At the end of March other species are hard to find

Thank you, so we'll write it down. I was doubtful, I thought what if it was Andrena what.

I shook the sacks of seeds, and he crawled out.
The Komi Republic. 01.04.16. Length 4.5 mm.
I don't know what exactly you need to take pictures of them to determine. Help ))

In my unprofessional opinion — Bombus terrestris L. most likely