This group if wasps gets its common name from the fact that they construct their nest of mud. They are typically nuisance pests. Mud daubers are found throughout the United States.
Adults mostly about 1/2"-1" (12-25 mm) long slender. Color usually black may have pale marking or a metallic luster. Thorax with pronotum collarlike. Wings clear or dark front wing with 1 or 3 submarginal cells. Abdomen either very slender or petiolate (stalked).
Mud daubers typically select a sheltered site to build their mud tubes. Favorite sites include under eaves porch ceiling in garages and sheds left open in barns protected buildings walls in attics etc.
Nests typically exhibit round holes in them as the wasps emerge. This means the nest is probably old and inactive after springtime.