Mud Daubers can be found throughout Ontario. These are large wasps with a body length of 20 to 30mm. They are predominately matte black with a few yellow areas on the thorax and first tergum of the abdomen. The legs are partly yellow and the wings deep amber.

They live in wet areas where mud can be found. Solitary, adults emerge in the spring after over wintering, staying about nine months as larvae or pre pupae. Females spend a few days exploring and feeding on nectar and larvae eat spiders. Afterwards, the female mates and hunts for a source of mud to begin the construction of her nest. Then she takes up the search for spiders, which she paralyzes with her sting and carries back to the cell. After completion of one cell, she begins another, until several have been constructed and provisioned. The cells have a characteristic ridged appearance at this point. The entire assemblage of cells finally is coated with a thin layer of mud and smoothed over.

The female lays an egg on a spider near the base of the cell, and the cell is capped with a mud plug. The larvae develop on spiders, which the adult female finds on foliage and flowers. Pupation takes place within a cocoon inside the cell. After transforming into an adult wasp, it breaks out of the nest.

Mud daubers generally do not sting unless provoked, because they do not defend their nests. Their nests can be a nuisance in houses, garages, under eaves, and in any types of building.

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