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I like Igor's keys but this one is difficult to follow because of the wording. I tried to key it along with you to gain more experience. My original thoughts are as follows:

1. can't be magnicornis because the hairs aren't restricted to the anterior region.
2. must be diaphana.
3. can't be diaphana because the hairs are not entirely covering the mesonotum.
4. females with a hypopygium? i'm not an expert, so maybe.
5. if it isn't correct, then what is it?
6. start over and assume a hypopygium is present. I get to loewi.
7. loewi doesn't seem to be correct.
8. is it really diaphana and the hairs are just scattered beyond the anterior region?
9. maybe i should suggest diaphana.
10. i will just see if i can ask Grichanov. maybe he will answer me.

i really didn't know if the hairs are entirely covering the mesonotum or if the hairs are just beyond the anterior region. I am happy to know the correct answer now. I am also happy that you have an id.

very nice photos. :)