Seashore Bug

         Seashore Bug

Observation - Seashore Bug - UK and Ireland. Description: Turning over a wooden pallet in the dunes, disturbed a number of Black Beetles ( fast moving and small) and also exposed several of the lighter cloured insects as pictured. Approximately 15- 20mm long they seem to prefer to hold still after being disturbe

Turning over a wooden pallet in the dunes, disturbed a number of Black Beetles ( fast moving and small) and also exposed several of the lighter cloured insects as pictured. Approximately 15- 20mm long they seem to prefer to hold still after being disturbed.
Suggestions please.