Hymenoptera Aculeata Westfalica Familia: Sphecidae (Grabwespen) Reference:WOYDAK, Horst. Hymenoptera Aculeata Westfalica Familia: Sphecidae (Grabwespen), 1996, 3-135.URL:https://www.lwl.org/wmfn-download/Abhandlungen/Abh_58(3)1996.pdf