Reference
Vittorio Nobile, Giuseppe Fabrizio Turrisi (2004): Contribution to the knowledge of Italian cleptoparastic Bees. X. The genus Sphecodes LATREILLE, 'pinguiculus PÉREZ' group, with description of new species (Hymenoptera, Apoidea, Halictidae). – Entomofauna – 0025: 117 - 129.