Common Blue Mud-dauber Wasp

It is ranged from northern Mexico to southern Canada, including most of the United States. It has also been introduced to regions including Hawaii, Bermuda, Croatia, and other European countries.

Females can build their own nests, but often refurbish nests abandoned by other wasps and bees, particularly those of Sceliphron caementarium, removing any spiders captured by S. caementarium and the larva, replacing it with an egg of its own and freshly caught spiders. They go through multiple generations in a year.