Contribution to the knowledge of the subgenus Margandrena Warncke, 1968 in the Iberian Peninsula: new records and ecological data (Hymenoptera: Andrenidae: Andrena)

New distribution records of Andrena marginata Fabricius, 1777 and Andrena pellucens Pérez, 1895 are presented to improve knowledge of the subgenus Margandrena Warncke, 1968 in Spain and the Iberian Peninsula. Data on floral preferences, flight periods, updated distribution maps, and intraspecific variation in coloration in both sexes are provided. Our results also confirm the parasitic relationship between Nomada argentata Herrich-Schäffer, 1839 and A. pellucens.