The name 'Black and Yellow Mud Dauber' comes from this species' coloration as well as its handmade creation. A dauber is a term used for an inartistic painter. In the autumn, a female Mud Dauber forms mud into balls that are then hollowed out. These balls form cells for her eggs. The mud balls are glued together with more mud to create a crude nest. Nests are usually placed under bridges or rocks, or along exposed beams of abandoned buildings or barns. These mud nests have also been found in garages, attics and outdoor picnic shelters in parks. The mud nest is kept dry by the structure's roof or overhang. Females lay an egg in a cell and place several paralyzed spiders she caught in the cell with the egg. Once an egg hatches, the wasp larva feeds on the the immobile spiders in its cell. After growing in size, the larva will form a paper-like cocoon and overwinter in the cell. It pupates in the spring and emerges from its cocoon as a flying adult wasp.