Nest-predator
Guides
Macrosiagon cruenta
Macrosiagon cruenta is a wedge-shaped beetle in the family Ripiphoridae. The species is known to occur as a nest parasite or predator of mason wasp larvae, specifically in nests of Ancistrocerus campestris. Larvae have been observed preying on wasp larvae within pre-existing beetle borings in wood, hollowed twigs, or abandoned mud dauber nests. The species has been documented across eastern and central North America.