Mellinus arvensis, commonly known as the field digger wasp, is a species of solitary wasp belonging to the family Crabronidae. These wasps are typically found in open fields and meadows across Europe and North America. They are medium-sized insects, measuring around 1-2 centimeters in length, with a slender body and black and yellow markings. Mellinus arvensis is known for its impressive digging abilities, as the females construct underground nests where they lay their eggs and provide provisions for their developing larvae.