Another Ectemnius species was present in larger numbers on the beehotel, Ectemnius cephalotes ^[1,2]. This is the male that also uses the beehotel for sleeping, like E. cavifrons, and it also inspects the beehotel thoroughly before choosing a suitable spot.

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Literature

¹ Nederlands Soortenregister

² Dollfuss, H., 1991. Bestimmungsschlüssel der Grabwespen Nord-und Zentraleuropas. Stapfia, 24, 1-247.