Identification of Diptera (flies, mosquitoes, etc.)

Thank you for the definition!

Here is another question that may be a little off topic, but it has been bothering me for a long time: do real Culicidae mosquitoes have males at all or not? If they do, why are they never seen? They only have blood-sucking females with proboscis.

Hmm, and how do you imagine the reproduction of mosquitoes? Parthenogenesis, as in stick insects?

Well, not only stick insects, but also grasshoppers, even in our region.
Even lizards have such species capable of parthenogenesis. I know about males with thick antennae, I've seen them, but they're too rare compared to females, and there are so many species of them! After all, females not only get caught when they attack for the sake of blood to get drunk, but also just accidentally fly into the country house and beat on the windows. And the males don't fly in.
That many mosquitoes feed on flower nectar, I know, even had to take a picture. Here's an example. Male or female?
If you do, it will be great!

Well, not only stick insects, but also grasshoppers, even in our region.
Even lizards have such species capable of parthenogenesis. I know about males with thick antennae, I've seen them, but they're too rare compared to females, and there are so many species of them! After all, females not only get caught when they attack for the sake of blood to get drunk, but also just accidentally fly into the country house and beat on the windows. And the males don't fly in.
That many mosquitoes feed on flower nectar, I know, even had to take a picture. Here's an example. Male or female?
If you do, it will be great!

Thank you all for the definition.

Here is another photo of Cheilosia sp. "no better, either?"

A male, of course. Only this is not a bloodsucker at all, but a predator. Similar to Empis livida [Empididae].

Ah, the pusher! I had such a vague suspicion, but the proboscis seemed too thin and the flower was confused - I thought that pushers are purely predators.

 
But the second picture is interesting - there the male brought the female prey, and while she eats it, he slowly does his job.

Dmitry, Gennady Perstnev watched the pushers in Penza very interestingly and he has excellent photos. I caught a big buzzer in the summer in the" Penza Mongolia " area of the village of Bikmurzino in the morning on the steppe slope a large fly is gray-black with white stripes (it will be necessary to take a picture in the collection). In the field, I shot through a net - an amazing animal, I had previously caught such a small and very worn one, and this is a fresh one and probably a female...

Rather, Bombomyia stictica (or what is its correct name now?), and "small and very shabby" refers to a different genus.

Why "rather"? Bombomyia stictica should have longitudinal light stripes on the dorsum. And here they don't seem to be visible.

Please help me with the definition. In the December thaw took off. Sevastopol, 16.12.2018

  Eypelodes luniger 

Eupeodes

The gorilla has big nostrils because it has thick fingers... And the keys are small.

Yes, I understand everything, sometimes I can write this myself, especially from the phone.
Simply, the questioner can start searching through Google and will not be able to find it. I can give him a hint. It is clear that you know everything correctly

Hello! Please tell me, is this Volucella zonaria? Chisinau neighborhood, July 2, 2017. Thank you in advance!

Time and place of shooting/fishing: 2018-08-13 16: 05: 00.
Russia, Tatarstan, Kazan, household management.
Is it possible to determine the Bibio view from images?

Thank you so much, Lech!
I want to sum up/sort those that are still left "without a family":

I've already written about number 60 once. Need to repeat?

I do not remember. I didn't find
it in my room.

Thank you so much, Lech!
I want to sum up/sort those that are still left "without a family":