Bees belonging to the genus Stelis have a cleptoparasitic mode of life, i.e. they parasitize other species of the same bee tribe, the Anthidiini. As they lay their eggs in the nests of other bees, they are also called “cuckoo bees”. This publication provides for the first time a comprehensive guide to the Stelis species of Europe, North Africa and the Middle East. It summarises our knowledge of all 29 species, and gives for the first time a comprehensive identifi cation key in the English language. The sections on individual species are richly illustrated with 156 colour microphotographs and a total of 246 line drawings, most of which show the morphological details that are useful for identifi cation. Information is provided for each species on the flowers visited and the seasonal occurrence together with a set of distribution maps.
Max Kasparek