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Mike Hackston has created illustrated keys to the UK Empididae and Hybotidae based on the keys in Collin (1960).

They are in the form of 4 PDF files covering:

Empididae, key to UK genera
Empididae, genus Empis
Empididae, genus Rhamphomyia
Hybotidae, key to UK genera

and are available online here:

https://sites.goo...tkeys/Home

(Not really new literature as they have been online since last year.)