a host specific cleptoparasite called Nomada armata which parasitizes a big proportion of brood cells in local populations. Other factors are the competition for pollen by other insects, and habitat loss and fragmentation. But the main reason is the reduced food-plant distribution because of larger farm units and not a lot of traditionally managed meadows. Therefore, Andrena hattorfiana is endangered because of pollen competition, not enough variability in their habitat, and because of there not being enough traditionally managed meadows. Parasites: Cuckoo bee is Nomada armata. Adults are sometimes infested with strepsiptera (Stylops melittae). Etymology Dedicated to Baron (?) Von Hattorf, from whose collection the specimen described by Fabricius comes from. Taxonomy Subgenus Charitandrena HEDICKE, 1933. References External links Biolib Fauna Europaea www2pms hattorfiana Insects described in 1775 Taxa named by Johan Christian Fabricius Hymenoptera of Europe