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The Hertfordshire Butterfly Atlas Project
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19th century abundant Adonis Blue Aldbury Aldbury Nowers amongst arable areas Ashridge August Berkhamsted Bishops Stortford black spots breeding Bricket Wood Britain Broxbourne Woods Butterflies of Hertfordshire Chalk Chalkhill Blue Clouded Yellow Comma conservation coppice decline Dingy Skipper distribution map early Eggs are laid entomologists Essex Skipper extinct females flight flowers Foster Gibbs grasses grasslands grazing habitats Haileybury Haileybury Natural Science Hairstreak Herts Hexton High Brown Fritillary hindwings Hitchin July June Knebworth Woods large numbers Large Tortoiseshell larvae larval foodplants late Letchworth males Marbled White margins Natural History Society Natural Science Society noted orange Overwintering Pearl-bordered Fritillary PLATE poor summers populations probably pupae pupate Rabbits records reports rides S. B. Hodgson scrub seen sightings Silver-spotted Skipper Silver-washed Fritillary small colony small numbers Small Skipper species specimens Speckled Wood St Albans sunny Therfield Heath trees Tring underwings upper forewings upperwings Watford weather White Admiral wildlife wings woodland