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Hi John & Dave,

Yes, this should be C. nitida. I can see two anteroventral and three posteroventral setae on the mid tibia.

I've sent you a wetransfer with the Norrbom & Kim 1985 paper (its 16MB ). And a e-mail with Rohacek's genera key in Contributions to a Manual of Palaearctic Diptera. Thats still completely up-to-date and I use it a lot.
Unfortunately identifying Sphaeroceridae should be easy, but its not. There is excellent literature out there, unfortunately you need about 160 different papers to correctly identify the European fauna. I'm afraid in Pitkin there are many species missing and mistakes in names and species concepts.
Currently I'm writing a paper with, among others Paul Beuk and David Brice reporting more than 20 new species for the fauna of the Netherlands. Also for the U.K. there is still a lot to discover...

Kind regards,
Ectemnius