The Blue Mud Dauber wasp is a solitary wasp. This species nests in sheltered locations such as under the eaves of buildings and usually appropriates old mud nests of
Sceliphron caementarium (Black and Yellow Mud-dauber), a black and yellow relative. Wasps carry water to renovate mud nests of
Sceliphron, rather than carry mud and make new nests. The blue mud-dauber is distributed transcontinentally, from southern Canada to northern Mexico. Like the Common Mud-dauber, the Blue Mud-dauber provisions its nest with spiders that it has paralyzed by stinging. The wasp larvae feed on the spiders [often black widows].
Note Author: Rob Cannings, Curator of Entomology, Royal British Columbia Museum