They can be as large as ¾”. They make their nests inside hollow tubes, such as twigs or holes in wood. Sometimes they use the tracks of window screens or window frames which they stuff with grass before placing some prey and an egg. There may be a row of similarly prepared cells. There is nothing to be alarmed; these wasps pose no threat to humans and don’t damage your house. They catch katydids or crickets to feed their young, so they are good pest controls.
Habitat. Fields, open areas, grassy areas.
Season. From March to December in most of North America. Most common in July and August.
Flowers. Many kinds of flowers of the aster family, including goldenrods, also fennel, queen Anne’s lace and sedum