Identification of Diptera (flies, mosquitoes, etc.)

Help plz Diptera to determine the type.
Moscow region

The maximum can be determined up to the type of buzz (photo1).

4 - Rhingia rostrata (fam. Syrphidae)

I always have problems with Rhingia: I can't reliably distinguish rostrata from campestris

Hm... Or maybe campestris... Differences in the pubescence of the arista, the shape of the "nose" and the color of the stripes. You can't really tell from this picture.

I understand that in rostrata the abdomen is always yellow (as in the photo), and in campestris it is usually with a black stripe in the middle.

Ha, I used to think so too! I wonder where this came from? I know that in females of rostrata the arista is always naked, while in campestris it is slightly pubescent. But still all this is written with a pitchfork on the water
I remember somewhere in the Internet I saw a key for European views, now I'll look for it.

Upd. Found

Ha, I used to think so too! I wonder where this came from?

Upd. Found

Thank you very much!!! I went to determine my fees.

I took it (as it seems to me) from Violovich - "Sirfids of Siberia and the Far East". At that time, even in the USSR, there were no photocopies, I copied the necessary pieces manually.

Will you whistle when you're done?" I wonder how they are distributed here.

 
I don't remember, but I don't think I've ever held this book in my hands.

this is certainly not a fly, ktyr, but I did not find a topic on diptera.
will you be able to specify all the details, despite the low quality of the image?

Laphria flava
Why not a fly? Ktyr is very much a fly

Laphria flava
Why not a fly? Ktyr is very much a fly

This is Laphria!
With a view of Pordon. This is L. gilva.

Laphria gilva didn't catch it, but the caller ID says: 1tergite in fluffy white, the rest in adjacent yellowish-red hairs.
Maybe the pubescence of the abdomen is covered by the wings?

Like here it is:

Like Laphria gibbosa, but maybe someone else

Help me identify a couple of ktyres! Caught in Severodonetsk (Ukraine) in mid-June, just over 2 cm long.

But what kind of flies are these, on the greens and droppings of mosquitoes in the char belt? Southern Urals

Who's that?"

And look at these flies, maybe you'll recognize someone:

photo 3 - some kind of fly of the Ulidiidae family, it reminds me of Ceroxys urticae, but the color of the wings and pronotum in my specimens is slightly different.

to alex 2611: are there any suggestions on the key points? Before the view is optional.