C.E. Tottenham’s (1954) RES Handbook is the main identification reference for these three subfamilies. I’m afraid I would have to vote CET’s key to genera of Omaliinae as the most accursed key in the British beetle literature! The good news is that Roy Anderson, having now finished with the Steninae, is working on a new RES Handbook to Omaliinae, Protenininae and Micropeplinae. I look forward to seeing test keys.