Moth recording is oragniased around 'vice-county' boundaries, which are roughly equivalent to the county boundaries in use before 1974. This means that "Berkshire" includes much of what is now south-west Oxfordshire. For instance, these places are all in Berkshire for moth recording purposes:

• Abingdon
• Didcot
• Faringdon
• Wallingford
• Wantage

On the other hand, Slough is in vice-county Bucknghamshire! Upper Thames Butterfly Conservation has some more information about vice-county boundaries.

[More text to come about moth recording.]

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Number of moth species recorded in Berkshire per 2km square ('tetrad')