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Berlin - mid August - 6.5 mm Female

I could be wrong but I suspect this to be Helina. I have no keys to this genus. I would like to have a copy of The Muscidae of Central Europe. Meantime, I see four dots on the abdomen, so Helina quadrinotata?

PS the ovipositor (genitalia) is better than counting hairs. just ask and I'll post the ovipositor.

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dorsal

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microscope - thorax

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microscope - lateral

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I have found some keys from a book at Google Books. I only get a few pages of a preview. I have to apologize for my inadequate post. I see that we will need many photos of this species to be able to determine a species.

I will update this post with more adequate details. I think that we can eliminate quadrinotata. I am suspecting Helina parcepilosa is a possibility.

I will add more photos...

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No need to apologize. It's true Helina are difficult from picture since some details can't usually be seen (like setulae on ventral side of radial node, beneath scutellum etc).
If the arista is plumose, I would tend to say H. parcepillosa as well (I guess 4 ks).

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Hello Sir Stephane, Thank You for your Time and Expertise. I didn't realize how difficult it is to id Helina. I am sorry about my sloppy post.

I've spent some time at the microscope today. I'll post some photos now.

first photo is of the underside of the scutellum:

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lateral

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eyes are sparsely hairy, so I suppose bare fits as well.

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palpi are black. The tiip of the palpi seems pale in certain angles with strong lighting.

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ventral/underside of wings. I see a couple of places with hairs:

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fore-leg

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mid leg

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hind leg

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ovipositor

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arista are definitely plumose:

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abdomen has brown spots

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here is a better view of the ovipositor.
I find it difficult to deal with an ovipositor. sometimes my dissection is awful. I broke the end off from the ovipositor. sorry. I teach myself how to dissect, so I am not familiar with a proper procedure. at least I have photos of it :)

these are a dorsal view of the oviposior from the en of the abdomen to the tip of the ovipositor (3 photos) plus spermathecae:

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2

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3

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spermathecae

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If the radial node is setulose, it should be H. confinis.

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H. confinis is definitely listed for Berlin.

One thing: I have no idea what is the radial node?
I'm assuming you mean the base of r5 (I get this expression from Tschorsnig)
I've shown the base of r5 plus the "node at the junction of humeral crossvein and vein Sc" (I get this expression from Rognes). I have never seen "radial node" in a drawing of a wing.

Hopefully, one of these areas in my photo is the radial node (I guess the R vein means radial, thus the node is what I call 'the base of r5".) Sorry for my lack of understanding here.

I will post a photo of the areas with setae. be right back ...

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both areas with arrows have hairs

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Yes, radial node is the base of R4+5.

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Thank You Sir Stephane. I appreciate your Time and Expertise very much.
I will refer to the base as radial node from now on. Thank You.

Meantime, I forgot to add a photo that would've helped you more. I am sorry. I get tired at the end of a day. I noticed that the hypopleuron/meron is a critical feature for determination. The meron of this species is bare. I've added the photo to this message for clarity.

Thank You for the determination. I wish for you a Pleasant Day.