A. Pekkarinen 1997: Parasitism of Stylops (Strepsiptera, Stylopidae) in poly- and oligolectic Andrena hosts (Hymenoptera, Apoidea). - Entomologica Fennica 8: 109-111.
The taxonomic status of many Stylops species described often on the basis of poor female characters is problematic and host specifity of these dubious species is largely unsettled. In Germany and Finland, oligolectic Andrena species were not observed to be parasitized more frequently by Stylops than polylectic ones. The result does not support several coexisting Stylops species with strict host specifity.