Reference:
Lomholdt, O. (1973). Biological observations on the digger-wasp Passaloecus eremita Kohl. Videnskabelige meddelelser fra Dansk naturhistorisk forening i København, 136, 29-41.
URL:
https://researcharchive.calacademy.org/research/entomology/Entomology_Resources/Hymenoptera/sphecidae/copies/Lomholdt_1973b.pdf
