Please note that these maps are generated from a database of nearly 1 million records, and so you may have to wait a little time for the results, depending on demands on the website server.
The regions used here are Watsonian vice-counties, subdivisions used in biological recording based on the historic counties of Britain. These remain unchanged by subsequent local government reorganisations, allowing historical and modern data to be more accurately compared.
Maps produced by MapMate® using Digital Map Data Copyright © Collins Bartholomew 2018. Data overlays Copyright © British Arachnological Society / Spider Recording Scheme 2018. Reproduction for study and non-profit use permitted, all other rights reserved.