Common blue butterfly, Polyommatus icarus, on lavender Credit Hayley Wiswell
Common blue butterfly, Polyommatus icarus, on lavender Credit Hayley Wiswell

The Royal Entomological Society have published handbooks for the identification of insects since 1949. Many are now also available as ebooks.

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Cover of handbook: British Lonchaeidae - Diptera. Cyclorrhapha, Acalyptratae

British Lonchaeidae – Diptera. Cyclorrhapha, Acalyptratae

Cover of Checklists of Insects of The British Isles (New series) Part 1: Diptera RES Handbook

Checklists of Insects of The British Isles (New series) Part 1: Diptera

Cover of The Staphylinidae (rove beetles) of Britain and Ireland Scaphidiinae, Piestinae, Oxytelinae RES Handbook

The Staphylinidae (rove beetles) of Britain and Ireland. Part 5: Scaphidiinae, Piestinae, Oxytelinae

Cover of Checklist of the Lepidoptera of the British Isles RES Handbook

Checklist of the Lepidoptera of the British Isles

Cover of The Staphylinidae (rove beetles) of Britain and Ireland. Parts 7 & 8: Oxyporinae, Steninae, Euaesthetinae, Pseudopsinae, Paederinae, Staphylininae RES Handbook

The Staphylinidae (rove beetles) of Britain and Ireland. Parts 7 & 8: Oxyporinae, Steninae, Euaesthetinae, Pseudopsinae, Paederinae, Staphylininae