This map summarizes the data already used. It includes 1845 data for 25 species.
Main contributions to the maps:
Datasets included 7.IX.2014:
BDFGM (Belgium, P. Rasmont, E. Haubruge) 1649 data; CFCS (Suisse, Y. Gonseth) 403 data; D. Baldock (UK); 39 data; J. Straka (Czech Republic, 9 data; T. Petanidou (Greece) 2 data.
Litterature data: That includes mainly Lieftinck (1968) 945 data.