Full colour throughout with photographs of many species, covering all 1548 species of micro- and macro-moths ever recorded in Hertfordshire, with 1428 distribution maps and 595 standard week adult flight charts. Introductory sections cover history, geology and habitats and a contributed chapter on the long term moth studies at Rothamsted. Final chapters give an overview of Hertfordshire's moth fauna, assess conservation management needs, present a Red List for Hertfordshire moths and recommend species to be included in Hertfordshire's Biodiversity Action Plan process.