Ancistrocerus callosus Thomson, 1870
Previously known as Ancistrocerus callosus (Thomson, 1870). Identification keys and general biology are given in Nielsen (1932), Spradbery (1973), Richards (1980), Yeo & Corbet (1995) and Archer (2000).
Cornwall to Kent, north to Cumbria and Northumberland (Gateshead) and Scotland (Roxburghshire and Aberdeenshire). Richards (1980) also gives Raasay in Scotland but no further details have been found. Also found on the Isle of Man, Isle of Wight and the Channel Islands. There is a single record from Ireland (Wicklow).
Overseas, occurs throughout Europe (including Norway, Sweden, Finland, The Netherlands, Luxembourg, France, Spain, Germany, Italy, Poland, Austria, Greece, Lithuania, Bulgaria, european Russia), north Africa, Turkey, to far eastern Russia, Mongolia and Japan.