Hymenopteran investigating an old wall

Hymenopteran investigating an old wall

Observation - Hymenopteran investigating an old wall - UK and Ireland. Description: I saw this insect rapidly exploring an old wall beside our Reserve. It did not run over the surface like our Dipogon spider-hunting wasps but mainly investigated the wall and its crevices while in flight, only touching down intermittently. From these imag

I saw this insect rapidly exploring an old wall beside our Reserve. It did not run over the surface like our Dipogon spider-hunting wasps but mainly investigated the wall and its crevices while in flight, only touching down intermittently. From these images, I can’t say whether it is some form of wasp or a masonry bee.