The families of British spiders

Delta Intkey for the identification of British Spiders to family. The interactive key allows free choice of characters, is easy to use, and can lead to correct identifications in spite of occasional errors. It can display all the illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa. To use the interactive key, you need to download a free program to your computer.
L. Watson and M. J. Dallwitz
Available as: 
multi-access key