The Four-toothed mason wasp is in the Potter/Mason wasp subfamily Eumeninae. Monobia quadridens is found throughout eastern North America, edging into southern Ontario to the north, the Great Plains on the west, and northern Mexico to the south.

Where do mason wasps make nests?

They prefer to nest in beetle holes only about 1/8 inch in diameter. The female will go deep into old beetle holes where she makes a series of chambers with a wall of mud between each chamber.

Do Mason Wasps sting you?

Yes, mason wasps can sting, but they rarely do. A female mason wasp's stings, like those of bees or bald-faced hornets, are venomous and can cause pain. Since their stinger is not removed after a sting, they are capable of stinging multiple times, unlike bees.