Jeremy Thomas 
The Butterflies of Britain and Ireland [PDF ebook] 

WINNER OF THE 2010 GUARDIAN NATURE BOOK OF THE YEAR
WINNER OF THE 1991 NATURAL WORLD BOOK OF THE YEAR AWARD
The Butterflies of Britain & Ireland provides comprehensive coverage of all our resident and migratory butterflies, including the latest information on newly discovered species such as Cryptic Wood White and the Geranium Bronze.
When first published in 1991 it won the Natural World Book of the Year Award and won plaudits from all quarters. Fully revised, considerably expanded and reset in 2010, it was judged that year”s Guardian Nature Book of the Year.
Now revised again to reflect the latest research findings, and with up-to-date distribution maps, this remarkable book is THE guide to the appearance, behaviour, life cycle and ecology of the butterflies of Britain and Ireland.