Straka, J.; Bogusch, P. Description of Immature Stages of Cleptoparasitic Bees <i>Epeoloides coecutiens</i> and <i>Leiopodus trochantericus</I> (Hymenoptera: Apidae: Osirini, Protepeolini) With Remarks to Their Unusual Biology. Entomol. Fennica 2007, 18, 242–254.