Map of the Czech Republic and Slovakia. Localities with the occurrence of Colletes hederae marked by a full circle and an empty circle were used for indication of a locality without record of the species. The nearest sites in Austria, Germany and Hungary are marked by blue circles and the possible routes of spreading towards Slovakia and the Czech Republic are shown by arrows. The species occurrence in the largest towns Brno (Czech Republic) and Bratislava (Slovakia) is shown in the maps under the top map.