Lane, S., Wright, R. & Forsythe, T., 2008
Beetles of Warwickshire
An atlas of the beetles of Warwickshire including records up to the end of 2007.
The maps are only of Warwickshire, but there is a lot of other information which should be of wider interest, including phenology charts, information on habitats and collection methods, etc. Also pictures of set specimens of many species.
Available as a free download. (It's a 62mb zip file. Unzip the files, copy them to a suitable location on your computer, then run the "Beetles of Warwickshire" application.)