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Often I go on 'look' - having gone through a few thousand this year alone.

I couldn't be 100% about the one in your photo, but it looks to have a ventral bristle about two thirds down the middle tibia. Which when separating Lonchoptera lutea and bifurcata, would make it bifurcata (some other Lonchoptera have this bristle too - but most are separated other ways) the vertical bristles are light in bifurcata and dark in lutea. If they are males they will lutea (unles you are really lucky - even so the genitalia are small in bifurcata if you where to find one). There is also something about the back of the jowels that I can't put into words.

In southern England I would say I have about 20% bifurcata/80% lutea, thought varies from site to site - it would interesting to know how this compares the the rest of Europe?

I have had two nice finds of L. nitidifrons this year. I have found two L. nigrociliata at a site where I found two L. meijerei last year, on fast flowing rivers - not the normal habitat for either species. L. tristis are normally an autumn species, but found some mid summer this year - this I put down to the very wet weather, there are still a few about. Try looking on rather damp beech leaf litter, this seems to be a favoured location, easy to spot in the field, they are slightly larger than bifurcata/lutea and an even consistent brown colour. The males have a distinctive bent mid tibia. It would be nice to have a photo of one on this site. L scutellata still eludes me, but has been found by other collectors at sites I visit often.